Consulta: subjectFacets:"Ultrastructure"
Registros recuperados: 155
Data/hora: 01/06/2024 04:27:58

Copper-induced adaptation, oxidative stress and its tolerance in Aspergillus niger UCP1261
Provedor de dados: 69
Autores: Cavalcanti Luna,Marcos A; Rodrigues Vieira,Edson; Okada,Kaoru; Campos-Takaki,Galba Maria; do Nascimento,Aline Elesbão.
Background The effects of exposure to copper, during growth, on the production of biomass, total protein, catalase, glutathione-S transferase, glutathione peroxidase, peroxidase, polyphosphate, acid and alkaline phosphatases, ultrastructure and the ability to remove this metal from Aspergillus niger, obtained from caatinga soil, were evaluated. Results All parameters tested were influenced by the concentration of metal in the culture medium. The presence of metal induced high levels of antioxidant enzymes, including lipid peroxidation, thereby revealing the appearance of an oxidative stress response. The variation in polyphosphate levels indicates the participation of the polymer in response to stress induced by copper. The activities of the phosphatases...
Tipo: Journal article
Palavras-chave: Aspergillus niger; Antioxidant enzyme; Copper removal; Polyphosphate; Ultrastructure.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-34582015000600006

MORPHOLOGY OF THE SYMMETRICAL MORPHOTYPES OF CENTRONELLA REICHELTII VOIGT (FRAGILARIACEAE, BACILLARIOPHYCEAE) FROM PATAGONIAN ENVIRONMENTS
Provedor de dados: 73
Autores: Echenique,Ricardo O.; Guerrero,José M.
The ultrastructure of symmetrical valves of Centronella reicheltii Voigt, resembling the former C. rostafinskii Woloszynska, is studied for the first time, and their morphology is compared with the asymmetrical forms. Valve morphology and morphometry of both morphotypes are similar and only differ in the shape and striation pattern of the valve centre and the arrangement of the arm bases. However, since they occur in environments with different trophic status, the new combination C. reicheltii f. rostafinskii is proposed for the symmetrical valves, because this distinction may provide ecologically useful information.
Tipo: Journal article
Palavras-chave: Trophic status; Diatoms; Taxonomy; Morphological variability; Ultrastructure.
Ano: 2004
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-66432004000100003

Spermatogenesis of Zaprionus indianus and Zaprionus sepsoides (Diptera, Drosophilidae): cytochemical, structural and ultrastructural characterization
Provedor de dados: 74
Autores: Rego,Letícia do Nascimento Andrade de Almeida; Silistino-Souza,Rosana; Azeredo-Oliveira,Maria Tercília Vilela de; Madi-Ravazzi,Lilian.
Zaprionus indianus is a drosophilid native to the Afrotropical region that has colonized South America and exhibits a wide geographical distribution. In contrast, Z. sepsoides is restricted to certain African regions. The two species differ in the size of their testes, which are larger in Z. indianus than in Z. sepsoides. To better understand the biology and the degree of differentiation of these species, the current study evaluated spermatogenesis in males of different ages by conventional staining techniques and ultrastructural analysis. Spermatogenesis and the ultrastructure of spermatozoa were similar in the two species, and the diploid number was confirmed to be 2n = 12. A greater number of spermatozoa were observed in young Z. indianus (1-3 days old)...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Zaprionus indianus; Zaprionus sepsoides; Spermatogenesis; Cytochemistry; Ultrastructure; Meiosis.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572013000100008

Morphological aspects of cell reabsorption in laying queens and workers of Apis mellifera (Hymenoptera, Apidae)
Provedor de dados: 76
Autores: Patrício,Karina; Cruz-Landim,Carminda da.
The occurrence of cell reabsorption in the ovaries of queens in several rates of laying eggs, artificially impeded of laying, and in nurse workers, of Apis mellifera (Linnaeus, 1758), was studied with light (LM) and transmission electron microscopy (TEM). Two types of structures were described and named by analogy with vertebrates ovarian structures, as corpus luteus, when resulting from the reabsorption of the follicular cells after ovulation, and corpus atresicus when resulting from total follicular reabsorption at any oocyte developmental stage. These structures have the same morphological characteristics and physiological signification in both castes. The corpus luteus occurrence indicates ovulation and its number is correspondent to the queen's rates...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Corpus luteus; Corpus atresicus; Oviposition; Histology; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000400001

Ultraestructura de los acinos sudoríparos de las glándulas pelvianas de Chaetophractus villosus (Mammalia, Dasypodidae)
Provedor de dados: 76
Autores: Estecondo,Silvia; Galíndez,Elena J.; Casanave,Emma B.
The acini of pelvian glands of Chaetophractus villosus (Desmarest, 1804) consisted of an inner layer of secretory cells and an outer layer of myoepithelial cells. Secretory cells have numerous secretory vacuoles. The secretion is released by exocytosis. Myoepithelial cells have numerous myofilaments that occupy much of the cytoplasm. There is a third cell type with an extremely electron-lucent cytoplasm.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pelvian glands; Sudoriparous acini; Ultrastructure; Chaetophractus villosus.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212000000200003

Ultrastructure et activite de la glande salivaire de Patella safiana LMK (Mollusque, Gasteropode)
Provedor de dados: 5
Autores: Benmeradi, S; Benmeradi, N.
The ultrastructural study of the Patella safiana salivary gland reveals two types of cells: the dark cells containing round-shaped secretory vesicles of lamellar structure and the light cells which have homogenous and fibrous secretory granules that are star-shaped sometimes. The two types of cells have the cytological characteristics of high proteosynthetic activity cells.
Tipo: Text
Palavras-chave: Patella safiana; Gastropoda; Biochemical analysis; Secretory organs; Cytology; Cells; Marine molluscs; Enzymes; Ultrastructure.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1712.pdf

Morphogenese sexuelle et regulation hormonale de l'activite genitale chez la crevette Penaeus japonicus en elevage
Provedor de dados: 5
Autores: Laubier, A; Chim, Liet; Payen, G.
A study of the sexual physiology of penaeid prawns essentially based upon Penaeus japonicus is performed in both descriptive and experimental ways, using the controlled rearings conducted at the Centre Oceanologique de Bretagne (CNEXO-COB), Brest. Sexual morphogenesis is described. This preliminary study enables definition of simple criteria for determination of the stage of genital development of the prawns during their growth. The neuroendocrine control of the genital system development is studied, using eyestalks ablations and male eyestalks extracts injection in prawns belonging to the same sex. A biochemical criterion as a test of the effect of eyestalks extract injections on the genital system development is discussed. The evolution of the specific...
Tipo: Text
Palavras-chave: Penaeus japonicus; Malacostraca; Controlled conditions; Neurosecretion; Cytochemistry; Ultrastructure; Sexual reproduction; Sexual maturity; Sexual dimorphism; Endocrinology; Eyestalk extirpation; Gametogenesis; Sex determination; Morphogenesis; Contrôle neuroendocrine de la reproduction; Morphogénèse sexuelle; Physiologie sexuelle; Élevage contrôlé; Penaeus japonicus.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1188.pdf

Etude Histopathologique et Ultrastructurale d'une Maladie Rickettsienne Chez le Crabe Carcinus mediterraneus Czerniavski (Crustace Decapode).
Provedor de dados: 5
This study constitutes the first occurrence of a rickettsia-like organism causing a disease experimentally transmissible in marine crustaceans. The high pathogenous power of this microorganism is an important factor of the regulation of the populations of Carcinus mediterraneus.
Tipo: Text
Palavras-chave: Carcinus mediterraneus; Population control; Ultrastructure; Histology; Microorganisms; Diseases.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/1980/publication-1933.pdf

Les cellules folliculaires secondaires de la crevette Macrobrachium rosenbergii (Decapoda, Palaemonidae): Mise en evidence d'un reseau tubulaire implique dans les echanges entre l'hemolymphe et l'ovocyte
Provedor de dados: 5
Autores: Meuzy, J; Jugan, P; Zerbib, C.
The epithelial cells of the ovary secondary follicles have been studied in the prawn Macrobrachium rosenbergii using electron microscope and horseradish peroxidase. A network of circomvolutioned and anastomosed tubules, measuring about 0.15 mu m in diameter, communicates with the extracellular space. This tubular network is a temporary structure which extensively increases the permeability of the follicular epithelium.
Tipo: Text
Palavras-chave: Macrobrachium rosenbergii; Malacostraca; Ultrastructure; Oogenesis; Morphogenesis; Epithelia; Ovaries; Vitellogénine; Réseau tubulaire; Epithelium folliculaire; Vitellogenèse; Macrobrachium rosenbergii.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1189.pdf

Fine cytochemical localization of lysosomal organelles in phagocytic cells of bivalve molluscs.
Provedor de dados: 5
Autores: Auffret, Mathieu; Diouris, M; Herry, A.
Bivalve molluscs possess several types of hemolymph cells (hemocytes), involved in internal defense and other physiological functions. Studies in pathological and experimental conditions have shown their micro- and macrophagic ability. However, the mechanisms of intracellular digestion are incompletely known in these organisms. The lysosomal apparatus of hemocytes was therefore investigated in several species by hydrolase localization with the electron microscope. The cytoplasmic granules of granulocytes displayed a strong acid beta -glycerophosphatase activity. Previous observations had shown that these granules may contain phagocytized material. This indicates that intracellular digestion is achieved in these organelles. Acid beta -glycerophosphatase...
Tipo: Text
Palavras-chave: Bivalvia; Phagocytosis; Cells; Ultrastructure; Haemolymph.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1631.pdf

Trophic relationships gonad-intestinal loop in Pecten maximus .
Provedor de dados: 5
Autores: Lepennec, M; Dorange, G; Beninger, P; Donval, A; Widowati, I.
Histological, histochemical and ultrastructural studies were performed on the region of the gonad traversed by the intestine in Pecten maximus . The results indicate a digestive and absorptive function of intestine epithelial cells and a transfer of metabolites to the surrounding gonad tissue. Several possible mechanisms of translocation are presented, including diffusion into the haemolymph and transfer via vacuolated cells of the gonad interstitial connective tissue.
Tipo: Text
Palavras-chave: Pecten maximus; Bivalvia; Histology; Haemolymph; Histochemistry; Cells; Metabolites; Epithelia; Intestines; Ultrastructure; Animal reproductive organs.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1668.pdf

Recherches histologiques et cytologiques sur les infections intracellulaires des mollusques bivalves marins
Provedor de dados: 5
Autores: Comps, Michel.
Trois types d'infections intracellulaires des molluques bivalves marins sont étudiés dans leurs aspects histologiques et ultrastructuraux. La première partie traite de deux maladies causées par des virus ADN intracytoplasmiques chez les huîtres Crassostrea angulata et Crassostrea gigas : la maladie des branchies et les mortalités massives de 1970 à 1977. Les caractéristiques morphologiques et ultrastructurales de vrions, leur morphogénèse et les effets pathogènes sont décrits et développés dans une étude comparative des deux types de viroses. Dans la seconde partie sont abordées les infections rickettsiennes des Pélécypodes marins avec la description de procaryotes appartenant aux Rickettsiales et d'agents infectieux à cycle de développement...
Tipo: Text
Palavras-chave: Mollusques bivalves marins; Infections intra-cellulaires; Virus; Iridovirus; Rickettsies; Cycle chlamydien; Protiste; Histologie; Ultrastructure.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00422/53365/54209.pdf

Dinophysis acuminate (dinophyceae), une espèce à géométrie variable sur les côtes françaises
Provedor de dados: 5
Autores: Lassus, Patrick; Marcaillou-le Baut, Claire.
Tipo: Text
Palavras-chave: Morphologie; Variabilité; Ultrastructure; Croissance; France; Dinophysis acuminata; Europe; Milieu marin; Zone côtière; Phytoplancton; Pyrrophycophyta; Algae; Thallophyta; Morphology; Variability; Ultrastructure; Growth; France; Europe; Marine environment; Coastal zone; Phytoplankton; Pyrrophycophyta; Algae; Thallophyta.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00133/24468/22484.pdf

Approche ecophysiologigue et ultrastructurale de l'osmoregulation chez les crustaces decapodes
Provedor de dados: 5
Autores: Pequeux, A; Lignon, J.
This paper deals mostly with recent physiological data on ion transport across the gill tissue and an attempt is made to correlate them with blood osmoregulation and ecological distribution in euryhaline decapods. A particular attention is paid to the gills of the fully euryhaline Chinese crab Eriocheir sinensis . Supporting this ecophysiological approach, there is an important ultrastructural analysis of the gill epithelium under various salinity conditions. The possible part played by the cuticle in ions movements is also considered.
Tipo: Text
Palavras-chave: Eriocheir sinensis; Cancer pagurus; Maia squinado; Carcinus maenas; Decapoda; Malacostraca; Ion transport; Gills; Ecophysiology; Cuticles; Ultrastructure; Salinity tolerance.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1387.pdf

La vitellogenese chez Patella coeruelae LMK (Mollusca, Gasteropoda). Approche ultrastructurale
Provedor de dados: 5
Autores: Benmeradi, N.
During the reproductive period, the microscopical observation of Patella coerulea ovary shows some ovogonies forming neets, supported by a conjonctive network, previtellogenic oocytes which leave gradually the conjonctive tissue and vitellogenic oocytes isolated in the acinus lumen. In early stages of previtellogenesis, an important nucleolar activity, caracterised by cloud-shaped or nematosomes and ribonucleoproteinic extrusions in cytoplasm compartment can be observed. At the end of this stage, the oocyte becomes richer in organites, mitochondria, granular endoplasmic reticulum and Golgi. We further notice the outcome of the first vitellin platelets. Production of vitellus is higher as three kinds of vitellus are observed in the following order: dark...
Tipo: Text
Palavras-chave: Ultrastructure; Oogenesis; Sexual reproduction; Vitellogenesis.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1720.pdf

Caracterisation des hemocytes d''un mollusque bivalve marin, la nacre, Pinna nobilis L. 1758
Provedor de dados: 5
Autores: Henry, M; Vicente, N; Houache, N.
The study of tinctorial affinities, in vitro behaviour and ultrastructure of the hemocytes of Pinna nobilis allows us to group them into two main families: basophilic, neutrophilic and acidophilic granulocytes; hyalinocytes, three categories can be distinguished among these cells: small hyalinocytes, hyalinocytes containing smooth endoplasmic reticulum and the macrophage population. The hemocytes participate in the regulation of metabolism by the storage and degradation of glycogen. They contribute to the detoxification process by the sequestration of mineral elements in their lysosomes. Their role in antibacterial defense is suggested by their bacterian phagocytic activity.
Tipo: Text
Palavras-chave: Pinna nobilis; Bivalvia; Haemolymph; Animal metabolism; Marine molluscs; Ultrastructure.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1711.pdf

Etude cytologique ultrastructurale des anomalies hepatiques du loup, de la daurade, et de l'anguille, induites par une alimentation artificielle
Provedor de dados: 5
Autores: Bac, N; Biagianti, S; Brusle, J.
In the three species Dicentrarchus labrax, Sparus auratus , and Anguilla anguilla an artificial feeding (dry pellets) disturbs liver cells as revealed at ultrastructural level. In hepatocytes, anomalies consist of lipids storage (liposomes) considered as deviation in fatty acids metabolism. Moreover are observed cellular alterations (mitochondrial vacuolization, nuclear pycnosis) related to degenerative process. It is of great interest to understand wether liver modifications are just a reaction to an unbalanced feeding or a true trophic pathology.
Tipo: Text
Palavras-chave: Dicentrarchus labrax; Serranidae; Pisces; Natural populations; Fish culture; Lipids; Fatty acids; Cytology; Ultrastructure; Cells; Diseases; Pellet feeds; Metabolism; Liver; Artificial feeding; Nutrition disorders.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/1983/acte-1250.pdf

Aspects ultrastructuraux de la biodegradation de l''ancienne cuticule de Carcinus maenas durant la periode preecdysiale
Provedor de dados: 5
Autores: Thorez, A; Compere, P; Goffinet, G.
Ultrastructural observations of various integumental regions of the crab Carcinus maenas show an important biodegradation of the old sclerites during premolt. At the ecdysis, this biodegradation extends from the basis of the membranous layer up the upper third of the principal layer. The first biodegradation features are a disorganization followed by a complete disappearance of the microfibrils. Numerous ecdysial droplets and double membrane bounded microstructures probably take part in biodegradation processes.
Tipo: Text
Palavras-chave: Carcinus maenas; Malacostraca; Ultrastructure; Moulting; Biodegradation.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/acte-1376.pdf

Etude d'une prolifération hémocytaire chez la moule Mytilus edulis
Provedor de dados: 5
Autores: Noel, Danièle.
Hemic proliferative disease in the bay mussel, Mytilus edulis, has been studied following mortalities in Washington State (USA). The disease has been reproduced in the labortory. The establishment of this experimental model led to study tumoral characteristics of the atypic hemocytes : ultrastrure, in vitro cultivation, transplantation. The infectious etiology of this tumor has been verified. It has been hypothesized to result from a viral infection since retrovirus-like particules have been observed following induction by bromodeoxyuridine. Specific monoclonal antibodies against atypic hemocytes have been obtained and characcterized
Tipo: Text
Palavras-chave: Mytilus; Mollusque; Hémocyte; Tumeur; Ulstrastructure; In vitro culture; Transplantation; Rétrovirus; Anticorps monoclonaux; Mytilus; Mollusca; Hemocyte; Tumor; Ultrastructure; In vitro cultivation; Transplantation; Retrovirus; Monoclonal antibodies.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00428/53930/55057.pdf

Caracteristiques ultrastructurales du spermatozoide de la coquille Saint-Jacques, Pecten maximus (Mollusque, Bivalve)
Provedor de dados: 5
Autores: Dorange, G; Lepennec, M.
The spermatozoon of Pecten maximus is of the primitive type usually associated with species having external fertilization or emitting the sperm in the water. The size of the nucleus is reduced. The middle piece is similar to that reported for several Bivalves. It contains glycogen. But the spermatozoon of P. maximus exhibits its own ultrastructural characteristics: the short acrosome differs in size, shape, position and ultrastructure or by a combination of these from that of many bivalves. No axial rods was observed in contrast to several species of Mytilidae, Veneridae and Ostreidae. These originalities could go to the genus level.
Tipo: Text
Palavras-chave: Pecten maximus; Bivalvia; Ultrastructure; Sperm.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/acte-1725.pdf

Bonamia exitiosus n. sp (Haplosporidia) infecting flat oysters Ostrea chilensis in New Zealand
Provedor de dados: 5
Autores: Hine, P; Cochennec, Nathalie; Berthe, Franck.
Bonamia sp. is a pathogenic parasite that occurs in the haemocytes of dredge oysters Ostrea chilensis Philippi in New Zealand, Ultrastructurally it resembles other haplosporidians in the possession of haplosporosomes, haplosporogenesis, persistence of mitotic microtubules during interphase and of the nuclear envelope during mitosis, and occurrence of a diplokaryotic or multi-nucleate plasmodial stage. Another stage containing a large vacuole derived from enlargement of 1 or more mitochondria has not previously been described from other haplosporidians. It most closely resembles B, ostreae Pichot et al., 1979, which parasitises and is pathogenic in haemocytes of European flat oysters, O. edulis. However, B. ostreae is smaller and denser, and has fewer...
Tipo: Text
Palavras-chave: New Zealand; 18S rDNA; Ultrastructure; Ostrea chilensis; Bonamia exitiosus.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-818.pdf

Ultrastructure of Mikrocytos mackini, the cause of Denman Island disease in oysters Crassostrea spp. and Ostrea spp. in British Columbia, Canada
Provedor de dados: 5
Autores: Hine, P; Bower, S; Meyer, G; Cochennec, Nathalie; Berthe, Franck.
An ultrastructural study was carried out on Mikrocytos mackini, the cause of Denman Island disease in Pacific oysters Crassostrea gigas in western Canada. Three forms were identified, quiescent cells (QC), vesicular cells (VC) and endosomal cells (EC), QC occurred in the vesicular connective tissue (VCT), haemocytes (hyalinocytes), adductor and heart myocytes, and extracellularly, They had a central round to ovoid nucleus, &lt;7 cisternae of inactive nuclear membrane-bound Golgi, few vesicles and lysosome-like bodies. VC were rarely extracellular and usually occurred in adductor and heart myocytes, in close association with host cell mitochondria. The contents of the host cell mitochondria appeared to pass through a tubular extension into the cytoplasm of...
Tipo: Text
Palavras-chave: Denman Island disease; Amitochondriate protozoan; Ultrastructure; Crassostrea gigas; Mikrocytos mackini.
Ano: 2001
URL: https://archimer.ifremer.fr/doc/2001/publication-815.pdf

Morphology, ultrastructure and molecular phylogeny of     Wangodinium sinense     gen. et sp. nov. (Gymnodiniales, Dinophyceae) and revisiting of     Gymnodinium dorsalisulcum     and     Gymnodinium impudicum
Provedor de dados: 5
Autores: Luo, Zhaohe; Hu, Zhangxi; Tang, Yingzhong; Mertens, Kenneth; Leaw, Chui Pin; Lim, Po Teen; Teng, Sing Tung; Wang, Lei; Gu, Haifeng.
The genus Gymnodinium includes many morphologically similar species, but molecular phylogenies show that it is polyphyletic. Eight strains of Gymnodinium impudicum, Gymnodinium dorsalisulcum and a novel Gymnodinium‐like species from Chinese and Malaysian waters and the Mediterranean Sea were established. All of these strains were examined with LM, SEM and TEM. SSU, LSU and internal transcribed spacers rDNA sequences were obtained. A new genus, Wangodinium, was erected to incorporate strains with a loop‐shaped apical structure complex (ASC) comprising two rows of amphiesmal vesicles, here referred to as a new type of ASC. The chloroplasts of Wangodinium sinense are enveloped by two membranes. Pigment analysis shows that peridinin is the main accessory...
Tipo: Text
Palavras-chave: Apical structure complex; Cyst; Dinoflagellate; Lepidodinium; Nuclear chambers; Pigment; Pyrenoid; Ultrastructure.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00454/56610/58307.pdf

Changes in motility, ATP content, morphology and fertilisation capacity during the movement phase of tetraploid Pacific oyster (Crassostrea gigas) sperm
Provedor de dados: 5
Autores: Suquet, Marc; Labbe, C.; Brizard, Raphael; Donval, Anne; Le Coz, Jean-rene; Quere, Claudie; Haffray, P.
Changes in sperm features during the movement phase are especially interesting to study in external fertilization species whose sperm duration movement is long because this implies a significant adaptation of moving cells to the external medium. This study describes the changes in tetraploid Pacific oyster sperm characteristics in relation to time post activation. Sperm individually collected on three tetraploid males were activated in seawater. Their features were analysed over a 24 h period and compared to a sperm pool collected on three diploid males as a reference. The percentage of motile spermatozoa, the intracellular ATP content, and the fine structure of spermatozoa were studied in relation to time post activation. Furthermore, the fertilisation...
Tipo: Text
Palavras-chave: Crassostrea gigas; Sperm; Tetraploid; Motility; ATP; Ultrastructure.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00006/11756/8639.pdf

Mantle histology, histochemistry and ultrastructure of the pearl oyster Pinctada margaritifera (L.)
Provedor de dados: 5
Autores: Jabbour-zahab, Roula; Chagot, Dominique; Blanc, François; Grizel, Henri.
The edge and isthmus of the mantle of Pinctada margaritifera (Mollusc, Bivalvia) were studied using light and electron microscopy from a morphological and histochemical point of view. Six areas with several subareas were differentiated in the mantle edge. One of these areas is similar to the epithelium isthmus, Trials to elucidate the nature of the pigment responsible for the black colour of the shell and pearl indicate a melanin-like material. Possible functions of the distinctive epithelial areas in Pinctada margartifera mantle are discussed according to available data on the secretion of organic matrix of the shell, protein sclerotization and deposition of crystals in some pearl-forming molluscs. Three different epithelial areas in the outer mantle edge...
Tipo: Text
Palavras-chave: Bivalvia; Mollusc; Pinctada margaritifera; Pigment; Ultrastructure; Structure; Mantle; Bivalves; Mollusques; Pinctada margaritifera; Pigment; Ultrastructure; Structure; Manteau.
Ano: 1992
URL: http://archimer.ifremer.fr/doc/1992/publication-2770.pdf

Recent aspects of nutrition in the dinoflagellate Dinophysis cf. acuminata
Provedor de dados: 5
Autores: Berland, Brigitte R; Maestrini, Serge Y; Grzebyk, Daniel; Thomas, Pierre.
No species of Dinophysis has yet been cultured in the full sense. To determine the photosynthetic capability in D. cf. acuminata, the dominant morphotype of the genus along the French Atlantic coast, we took material from natural populations, in some trials by pipetting out single cells, and in others using plankton assemblages enriched in D. cf, acuminata by size fractionation and reverse sedimentation. Inorganic carbon uptake was measured at temperatures from 11 to 23 degrees C and at a light intensity of 400 mu mol photons m(-2) s(-1). Total uptake was proportional to the number of cells and increased linearly with incubation time, the uptake rate showing a distinct maximum at 18 degrees C, while at 23 degrees C being only half this maximum....
Tipo: Text
Palavras-chave: Dinophysis cf. acuminata; Nutrition; Ultrastructure.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/00258/36958/35624.pdf

Transmission Electron Microscopy of the Gastrointestinal Tract of Nile Perch Lates niloticus
Provedor de dados: 77
Autores: Namulawa,V. T; Kato,C. D; Nyatia,E; Rutaisire,J; Britz,P. J.
The ultrastructure of the gastrointestinal tract of Nile perch was described using Transmission Electron Microscopy standard procedures. Investigations revealed the presence of mucous cells, blood vessels and oil droplets plus several nerve cells and muscle bundles in the oral cavity. Further observations revealed columnar epithelial cells in the oesophagus, with a ragged surface, high electron dense cytoplasm, intercellular spaces, mitochondria and mucus granules. The lamina propria of the oesophagus was composed of loose connective tissue, blood vessels, nerve cells and several leucocytes, while the muscularis externa was composed of striated muscle bundles with the a Z line, A band and I band. The stomach was characterized by mucosal glandular cells...
Tipo: Journal article
Palavras-chave: Ultrastructure; Gastrointestinal tract; Nile perch.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200053

Histological Description of Oogenesis in Chiton virgulatus (Mollusca: Polyplacophora)
Provedor de dados: 77
Autores: Vélez-Arellano,Nurenskaya; Shibayama,Mineko; Ortíz-Ordoñez,Esperanza; Silva-Olivares,Angélica; Arellano-Martínez,Marcial; García-Domínguez,Federico.
This paper describes the oogenesis of Chiton virgulatus, based on histological observations under transmission and scanning electron microscopy. Three oocyte types were identified: i) previtellogenic oocytes with a mean diameter of 50±20.5 µm, surrounded by elongated follicular cells of approximately 5 µm, ii) immature vitellogenic oocytes with a mean diameter of 113±15.3 µm and small cytoplasmic projections denoting the onset of the oocyte hull development; adjacent to each projection are pores approximately 0.7 µm in diameter, and iii) mature vitellogenic oocytes with a mean diameter of 146±24.8 µm; the oocyte cytoplasmic projections grow and its apical zone becomes trident-shaped; follicular cells adopt a bulbous shape due to the growth of the...
Tipo: Journal article
Palavras-chave: Egg hull; Vitellogenesis; Ultrastructure.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200038

Transmission Electron Microscopy Studies of the Vestibulocochlear Nerve in Chronic Diabetic Rats
Provedor de dados: 77
Autores: Vasconcelos,Carlos Augusto Carvalho de; Fazan,Valéria Paula Sassoli; Moore,Kenneth Charles; Nessler,Randy Alan; Valença,Marcelo Moraes.
It is widely described in the literature that diabetic patients present hearing impairment. Despite the histological alterations of the internal ear structures in these patients as well as in experimental models of diabetes, to the best of our knowledge, an histological evaluation of the vestibulocochlear nerve have not been performed. In the present study, ultrastructural alterations are described and compared between a spinal nerves and a cranial nerve in rats with chronic induced diabetes. Male Wistar rats (n = 12), fed with standard diet from the animal care facility at 42 days of age were used. Induced diabetic animals (n=6) were fasted for 12 hours prior to being injected intraperitoneally with streptozotocin (STZ - 60mg/kg) in a single dose. Control...
Tipo: Journal article
Palavras-chave: Experimental diabetes; Vestibulocochlear nerve; Ultrastructure; Myelinated fibers; Axonal atrophy.
Ano: 2011
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022011000100045

Ultrastructure of the Thyroid Gland in Adult West African Dwarf Goat (Capra hircus)
Provedor de dados: 77
Autores: Igbokwe,Casmir Onwuaso; Ezeasor,Daniel Nwagbo; Umar,Mohammed Bello.
The present study examined ultrastructure of the thyroid gland of adult West African Dwarf (WAD) goat in order to further understand the ultrastructural morphology and some of the changes in the components of the thyroid gland in goat with age. Thyroids glands obtained from fifteen adult WAD goats of different ages and sexes slaughtered at the local abattoirs were used in this study. Electron microscopic techniques were used to study the fixed tissue with emphasis on the follicular and parafollicular cells. The results showed that the ultrastructure is generally similar to that of some domestic animals. Follicular cells were cuboidal in young adult goats thyroids but were flattened in older goat thyroids of 5­7 years. These cells remarkably showed highly...
Tipo: Journal article
Palavras-chave: Ultrastructure; Thyroid gland; Dwarf goat.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200020

Cytological Aspects of the Differentiation of Barb Cells During the Formation of the Ramus of Feathers
Provedor de dados: 77
Autores: Alibardi,Lorenzo.
The present ultrastructural study on developing and regenerating feathers of chick and zebrafinch describes the ultrastructural changes that occur during the differentiation of barb cells that leads to the formation of the ramus of barbs. Differently from barbule and barb cortical cells that accumulate feather keratin, barb medullary cells undergo to lipid degeneration. Eventually, lipids disappear and medullary cells become empty cavities in the central part of the ramus. In barb medullary cells feather keratin is accumulated in few peripheral bundles that merge with those of cortical cells to fom the wall of the ramus. The latter is joined with branching barbules. The process that controls the transition from keratin-synthesizing to lipid-producing barb...
Tipo: Journal article
Palavras-chave: Feathers; Barbs; Differentiation; Lipidization; Ultrastructure.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000100010

Influence of Laser Therapy and Muscle Relaxant on the Masseter Muscle under Occlusal Wear: An Ultrastructural Study
Provedor de dados: 77
Autores: Lisboa,Márcio Vieira; Pinheiro,Antônio Luiz Barbosa; dos Santos,Marcos André Vannier; Baptista,Abrahão Fontes; de Sousa,Ana Paula Cavalcanti; Pires Valença Neto,Alberto de Aguiar; dos Santos,Jean Nunes.
The aim of this study was to analyze the influence of low-intensity laser therapy and muscle relaxant in the characteristic ultra structural masseter muscle occlusal wear. Animals and Methods: 40 male Wistar rats were randomly divided into four groups: the control group (GI), occlusal wear (G-II), laser occlusal wear (G-III), and the muscle relaxant occlusal wear (G-IV). Under general anesthesia given intraperitoneally, animals in groups II, III and IV had unilateral amputation of upper and lower molar cusps to simulate an occlusal wear situation. The masseter muscle G-III received laser therapy (830nm, 4J/cm2, 40mW, f ~ 2mm) and the procedure was subsequently repeated every other day for 14/30 days. G-IV animals were treated with daily injection of...
Tipo: Journal article
Palavras-chave: Lasertherapy; Ultrastructure; Dental occlusion; Masseter muscle relaxant.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000300038

Morphological Aspect of the Midgut of Anopheles aquasalis (Curry, 1932) Insecta: Diptera
Provedor de dados: 77
Autores: Ferreira,M. A. R; Lima,J. B; Rocha,R. M; Pimenta,P. F. P.
The midgut of adult female Anopheles aquasalis presents a narrow anterior or thoracic region and a distensible posterior or abdominal region constituted by the epithelium formed by a cell layer whose apical portion presents microvilli and the basal portion, a basal labyrinth. The thoracic region revealed heterogeneous cellular staining affinity mainly by the presence of acidic components. The ultrastructural aspect showed columnar cells with the presence of the vesicle, mitochondria, endoplasmic reticulum and secreting cells. The abdominal region of the midgut revealed an irregular epithelium whose cells presented a basophilic cytoplasm and acidophil granules. It was also found secreting and/or basal cells with narrow cytoplasm. The ultrastructural...
Tipo: Journal article
Palavras-chave: Anopheles aquasalis; Midgut; Mosquito; Ultrastructure.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000300012

Ultrastructural Study of Spermatogenesis in Eisenia foetida (Annelida, Oligochaeta)
Provedor de dados: 77
Autores: Rolando,A.; Romanini,M. C.; Mugnaini,M. T.; Bozzo,A.; Pastorino,I.; Soñez,C. A.
Spermatogenesis and the spermatozoon ultrastructure follow a common pattern in terrestrial oligochaetes. However, many of their characteristics are distinctive of each species and they are of great importance for phylogenetic and taxonomic studies. Germinal cells were studied through conventional electronic microscope techniques in order to go deep on spermatogenesis, especially on the mature spermatozoon ultrastructure of Eisenia foetida. Spermatogenesis occurs in seminal vesicles and follows a pattern comparable to that of some other oligachaetes species. Spermatozoon ultrastructural details revealed that it is a filiform cell, with the acrosome placed in anterior position, followed by the nucleus, the midpiece and the tail which flagellum has a 9+2...
Tipo: Journal article
Palavras-chave: Oligochaeta; Spermatogenesis; Ultrastructure; Spermatozoa; Eisenia.
Ano: 2007
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022007000200005

Effect of Cigarette Smoking on the Structure of Hepatocytes: TEM Study
Provedor de dados: 77
Autores: Battah,Khairat A; Badran,Darwish H; Shraideh,Ziad A.
The liver is one of the major organs that is indirectly affected by cigarette smoke. The aim of this project is to define the histologic and ultrastructural changes in normal liver cells after exposing animals to cigarette smoke. Thirty albino rats were exposed to cigarette smoke for 90 days, followed by morphologic examination of their livers under light microscope and electron microscope. The liver cells of cigarette smoke exposed rats showed mild swelling with increased eosinophilia. Ultrastructural examination of these cells demonstrated cytoplasm with highly proliferated and crowded mitochondria. There were many electron dense mitochondria. These mitochondria were pleomorphic in shape compared to mitochondrias of control rats. Also, loss of...
Tipo: Journal article
Palavras-chave: Liver; Smoking; Mitochondria; Ultrastructure.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000400011

Comparison of Amphotericin B Lipid Complex (Abelcet) and Liposomal Amphotericin B (Ambisome) on Rat Kidney: a Morphological Evaluation
Provedor de dados: 77
Autores: Mutluay,S. Deniz; Karakas,Pinar; Tasova,Yesim; Mete,Ufuk; Bozkir,M. Gülhal.
The aim of our study was to compare the nephrotoxic effects of liposomal Amphotericin B (Ambisome) and Amphotericin B lipid complex (Abelcet) on rat kidneys at short (14 days) and long term (28 days) treatment applications. Thirty-six male Wistar rats were included and divided into six groups (n=6). Groups 1 and 4 are composed as control groups by administrating intraperitoneal (ip) 0, 9 molar Serum physiologic for a period of 14 and 28 days respectively. Group 2 and 3 are treated with 5 mg/kg Ambisome and 5 mg/kg Abelcet for 14 days respectively, Group 5 and 6 are treated with same agents for 28 days respectively. Then, the rats were transcardially perfused, samples were taken from cortex and medulla regions of kidneys. The micrographs of group 1 and 4...
Tipo: Journal article
Palavras-chave: Amphotericin B lipid formulations; Rat kidney; Nephrotoxicity; Ultrastructure.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022012000200033

Expression of VEGF and CD68 in the Placenta of Gestational Diabetic Mothers (Immunohistochemistry and Ultrastructural Study)
Provedor de dados: 77
Autores: Yavuz,D; Balsak,D; Ekinci,C; Tahaoglu,A. E; Togrul,C; Görük,N; Aktas,A; Karaman,E.
Placental angiogenesis, is essential for embryonic and fetal development. In this study, 18 gestational diabetes mellitus and 22 control pregnancies were included. Gestational diabetes mellitus (GDM) groups compared to the control group significantly higher values were detected (p&lt;0.01). The following histological results were assessed; villous immaturity, chorangiosis, presence of, sncytial knots,mononuclear cell infiltration ischemia and fibrinoid necrosis. To evaluate and compare the placental histology of normal and GDM pregnancies. placentas of pregnant women with gestational diabetes also in terms of angiogenesis and macrophages and ultratructural revealed by examining the possible relationship between fetal complications were investigated.
Tipo: Journal article
Palavras-chave: Gestational Diabetes (GDM); VEGF; CD68; Ultrastructure.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000200018

Ultrastructural and Immunohistochemical Effects of Aqueous Leave Extract of Xylopia aethiopica on the Stomach in Streptozotocin-Induced Diabetic Rats
Provedor de dados: 77
Autores: Ofusori,D. A; Komolafe,O. A; Adewole,O. S; Arayombo,B. E; Margolis,D; Naicker,T.
Gastrointestinal pathology in diabetic patients has become a source of concern in recent times. The aim of this study was to investigate the ultrastructural and immunohistochemical effects of aqueous leaf extract of Xylopia aethiopica on the stomach in streptozotocin-induced diabetic rats. This study was conducted using thirty adult Wistar rats. The animals were divided into three groups (n= 10). Group A was the control animals (administered with equivalent volume of citrate buffer), group B was diabetic animals induced by a single intraperitoneal injection of streptozotocin dissolved in citrate buffer (65 mg/kg) and group C was diabetic animals treated with 200 mg/kg body weight of aqueous leave extract of X. aethiopica for twenty five days. At the...
Tipo: Journal article
Palavras-chave: Diabetes mellitus; Immunohistochemistry; Ultrastructure; Stomach; Xylopia aethiopic.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100006

Morphological and Biochemical Changes of Salmonella hadar Exposed to Aqueous Garlic Extract
Provedor de dados: 77
Autores: Belguith,H; Kthiri,F; Ben Ammar,A; Jaafoura,H; Ben Hamida,J; Landoulsi,A.
The effect on Salmonella hadar growth was investigated using fresh sterile liquid medium (Pronadisa, Hispanlab) containing aqueous garlic extract (AGE) at different concentration (0, 11, 12, and 13 mg/ml). The garlic extract added at these final concentrations had a bacteriostatic effect on Salmonella hadar. The effect of these bacteriostatic concentration of AGE on the growth of the tested serovar, revealed a pattern of inhibition characterized by: (i) a transitory inhibition phase whose duration was proportional to AGE concentration (ii) a resumed growth phase which showed a lower rate of growth than in uninhibited controls, and (iii) an entry into stationary phase at a lower culture density. The minimal inhibitory concentration and minimum bactericidal...
Tipo: Journal article
Palavras-chave: Allium sativum; Allicin; Antimicrobial effects; Garlic; Salmonella hada; Ultrastructure.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300013

Ultrastructural Features of Ovary of the Female African Giant Rat (Cricetomys gambianus, Waterhouse) During Oestrous Cycle
Provedor de dados: 77
Autores: Akinloye,Adebayo Koyuum; Oke,Bankole Olusiji.
Fine structures of the ovary during the oestrous cycle in African giant rats (Cricetomys gambianus Waterhouse) were described in the present study. Ultrastructural features of the germinal epithelium and the medullar of the ovary were similar at different stages of the oestrous cycle. During mid proestrus, there was disorganization of the inner layer of the granulosa cells of secondary follicles to form the antrum. At late proestrus/early estrus, antrum formation had advanced and there was evidence of reorganization of granulosa cells. Fine structures of the ovary during mid estrus include follicles with variably shaped mitochondria, profiles of Golgi complexes and dense concentration of ribosomes. The theca interna shared similar ultrastructure with the...
Tipo: Journal article
Palavras-chave: Ultrastructure; Ovary; Oestrous Cyclei; African Giant Rat.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000200030

MORPHO-CYTOCHEMICAL AND ULTRASTRUCTURAL CHARACYERIZATION OF PERIPERAL THROMBOCYTES OF ROADSIDE HAWK Buteo magnirostris GMELIN, 1788) (AVIAN, FALCONIFORM)
Provedor de dados: 77
Autores: Aguiar Santos,Antenor; Marques Joppert da Silva,Adriana; Lima de Carvalho,Vinicius Antonio; Imoto Egami,Mizue.
Basic hematological information about the avian in its natural habitat is limited. In this study we aimed at investigating, in the peripherical blood of the roadside hawk, Buteo magnirostris, the number of thrombocytes and their morphological, cytochemical and ultrastructural aspects. Blood smears were submited to the following methods: Leishman for morphological analysis and specific methods for the characterization of four kinds of macromolecules of different chemical nature: Glycogen, lysosomal enzymes (myeloperoxidase and the acid phosphatase), basic polyaminoacid rich proteins and phospholipids. The average number of thrombocytes was 26.8 x 10³ &amp;plusmn; 10,2 / &amp;micro;L. Structurally the thrombocytes present predominantly elliptic shape, with...
Tipo: Journal article
Palavras-chave: Avian; Thrombocyte; Morphology; Cytochemistry; Ultrastructure.
Ano: 2003
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022003000400004

Ultrastructural Aspects of Spermatogenesis in Phalloceros caudimaculatus (Teleostei, Poeciliidae)
Provedor de dados: 77
Autores: Vicentini,Carlos Alberto; Muñoz,Mario Esteban; Vicentini,Irene Bastos Franceschini.
The aim of the present study was to analyze the ultrastructural aspects of spermatogenesis in Phalloceros caudimaculatus, during cell proliferation. The parenchyma is organized morphologically as lobular restricted spermatogonial testis. Spermiogenesis in this species is characterized by four morphological stages of development (spermatids S1 through S4). The mature spermatids and spermatozoa heads are situated at the periphery of the cyst surrounded by the cytoplasm of the Sertoli cells. The germ cell's ultrastructure and spermatogenesis in P. caudimaculatus are very similar to that of other poeciliids.
Tipo: Journal article
Palavras-chave: Spermatogenesis; Ultrastructure; Poeciliidae; Phalloceros caudimaculatus.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300047

Ultrastructure of the Secretory Epithelial Cells of the Bulbo-Urethral Glands (Cowper's gland) in the Indian Fruit Bat, Rousettus leschenaulti (Desmarest) During the Reproductive Cycle
Provedor de dados: 77
Autores: Nerkar,Archana A; Gujar,Maher P; Gadegone,Mohan M.
The present paper describes the ultrastructural characteristics of the bulbo-urethral gland (Cowper' glands) of the Indian fruit bat, R. leschenaulti during sexually inactive-breeding cycle. Cyclic histological changes during the seasonal breeding quiescence cycle are not well marked. There are no marked differences. The ultrastructural characteristic of the secretory epithelial cells of Bulbo-Uretrhal Gland gland have been studied during different phases of reproductive cycle. The secretory epithelial cells are characterized by the well-developed rough endoplasmic reticulum, extensive developed complexus golgiensis (Golgi apparatus) and mitochondria. Mitochondria with lamellate cristae are dispersed in the cytoplasm. Three different types of secretory...
Tipo: Journal article
Palavras-chave: Chiroptera; Bat; Ultrastructure; Bulbo-urethral gland; Acini; Epithelial cells.
Ano: 2017
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022017000100035

Ultrastructure of Fetal Mice Hepatocytes Exposed in Utero to Diazepam
Provedor de dados: 77
Autores: Márquez-Orozco,María Cristina; de la Fuente-Juárez,Graciela; Márquez-Orozco,Amalia.
Previous research has shown that fetal mice hepatic cells from females treated with diazepam (Valium) during pregnancy depict cytoplasmic and nuclear modifications when observed with photonic microscope. The purpose of this work is to investigate if diazepam administered subcutaneously (SC) to pregnant mice females induces ultraestructural alterations in the cytoplasmic organelles and nucleus to fetal hepatocytes. Transmission electron microscopy observations of fetal hepatocytes from pregnant females treated with a single daily dose of diazepam 2.7 mg/kg/bw/SC administered from 6th to 15th days of gestation revealed that they frequently presented disorganized and dilated rough endoplasmic reticulum cisterns, membranous elements, abundant Golgi complex and...
Tipo: Journal article
Palavras-chave: Benzodiazepines; Diazepam; Fetal hepatocytes; Ultrastructure.
Ano: 2015
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022015000400040

Ultrastructure Features of Coronary Artery Endothelium in Bactrian Camel (Camelus bactrianus)
Provedor de dados: 77
Autores: Yuan,Guoqiang; Pan,Yawen; Li,Haiyan; Wang,Jianlin.
Vascular endothelium play an essential role in regulating endothelial functions by maintaining normal vascular tone, modulating hemostasis, and preventing thromobogenesis. The aim of present study was to reveal ultrastructure features of coronary artery endothelium in Bactrian Camels by means of scanning electron microscope (SEM) technology. The results showed that the endothelial cells distribute along the direction of blood flow. Their morphology and protuberant degree towards luminal surface vary for different parts of the coronary artery. The luminal surface of a.c oronaria sinistra and a. coronaria dextra was covered by impaired and intact endothelium, respectively. Platelets and leukocytes sticking to the endothelium were found.
Tipo: Journal article
Palavras-chave: Endothelial cells; Bactrian Camel; Coronary artery; Ultrastructure.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100040

Micro-ultrastructure Features of Liver in Chinese Taihe Black-bone Silky Fowl (Gallus gallus domesticus Brisson)
Provedor de dados: 77
Autores: Zhang,Hui; Ge,Tingting; Gandahi,Jameel Ahmed; Peng,Shasha; Zhong,Shengwei; Zhou,Zuohong.
In this work, the morphological features of liver in Chinese Taihe black-bone silky Fowl (BSF) were analyzed by light microscope and transmission electron microscopy. The results showed that two kinds of hepatocytes were present in Taihe BSF liver, i.e., the dark and the light hepatocyte. The dark hepatocyte was electron-dense and lager, with many organelles, mitochondria especially. The light hepatocytes were smaller than the dark. They had electron-lucent cytoplasm with a small number of organelles. Furthermore, there were lipolysosomes in the light hepatocyte. The numerous long and serried finger-like microvilli spread into bile canaliculus lumen. The glycogen granules intensely stained, spread in some hepatocytes. Numerous glycogen granules scattered...
Tipo: Journal article
Palavras-chave: Chinese Taihe black-bone silky fowl; Liver; Ultrastructure.
Ano: 2014
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022014000300043

New and Probable Ultrastructural Criteria for Identification of Cytoplasmic Sol ­ Gel States
Provedor de dados: 77
Autores: Hipkaeo,Wiphawi; Kondo,Hisatake.
In embedment-free transmission electron microscopy without employing epoxy embedding media, the cytoplasmic matrix, in which cell organelles and elements including the cytoskeletons are held in place, lattices of strands are clearly and constantly disclosed in every cell. Their compactness is variable in different kinds of cells and in different domains of one and the same cell, and it is changeable under hypo- or hyper-osmolarity. In addition, the appearance of strand-lattices is duplicable in artificial proteins at different sol/gel states and concentrations. All taken together, a new and probable ultrastructural criteria has been proposed for identification of cytoplasmic sol/gel states with a hope that the dynamic properties of the cell is understood...
Tipo: Journal article
Palavras-chave: Sol and gel; Cytoplasm; Embedment-free; Ultrastructure.
Ano: 2016
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022016000100030

Morphological Features of the Apical Region in the Principal Cells of Mongrel Dog Epididymis
Provedor de dados: 77
Autores: Schimming,Bruno Cesar; Vicentini,Carlos Alberto.
The epithelial principal cells are the predominant cell type of the epididymis. These cells have been shown to be both secretory and endocytic cells. The apical region of the cytoplasm of principal cells in the mongrel dog are located close to the cell apex and tubular lumen, and shown microvilli at the luminal border and present a endocytic apparatus, that consists of coated pits and vesicles, endosomes of varying size, multivesicular bodies, and lysosomes. The endosomes, multivesicular bodies and lysosomes contained the electron-dense patches. These results suggest that principal cells of the epididymis in the dog as possess a highly developed endocytic apparatus play a role in endocytosis. These cells function are similarly to the related in other...
Tipo: Journal article
Palavras-chave: Epididymis; Dog; Principal cells; Ultrastructure.
Ano: 2008
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022008000100025

Ultrastructural Study of the Neuromuscular Junctions of Extensor Digitorum Longus Muscle (M. extensor digitorum longus) of the Mice
Provedor de dados: 77
Autores: Boaro,Sueli N; Fragoso Neto,Raul A.
The neuromuscular junction of the extensor digitorum longus muscle of fingers was analyzed in 21 young (three months) and old (from six to 25 months) mice, from both genders. Morphologic changes were found throughout the mouse life, being more frequent and visible with aging. According with the data described in the literature consulted and the observations taken in this research, it becomes clear that a continuous process of morphological remodeling occurs in all neuromuscular ultrastructural junctions of the extensor digitorum longus muscle of fingers, during the life of the animal. Theses changes are characterized by figures of myelin in the cytoplasm of Schwann cells, pleomorphic and multivesiclar bodies, mitochondrias with morphologically altered...
Tipo: Journal article
Palavras-chave: Neuromuscular junctions; Mice; Ultrastructure; Extensor digitorum longus muscle.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000300045

Ultrastructural Characterization of the Pars Distalis of the Indian Female Sheath-Tailed Bat, Taphozous longimanus (Hardwicke)
Provedor de dados: 77
Autores: Nerkar,Archana A; Gadegone,Mohan M.
The present ultrastructural observations demonstrate the presence of six cell types in the pars distalis of non-pregnant and pregnant bats of Taphozous longimanus. In the pars distalis of T. longimanus, STH cells are round to oval with eccentrically placed nucleus, numerous secretory granules and well developed Golgi indicate a cell under vigorous synthetic activity while those filled with secretory granules with reduced Golgi complex suggest reserve or storage state of cells. LTH cell is characterized by the large secretory granules, dilated endoplasmic reticulum and numerous mitochondria in the cytoplasm which indicate that these cells are hypertrophied and synthetically very active during pregnancy. ACTH cells are found either singly or in groups and...
Tipo: Journal article
Palavras-chave: Bat; Pars distalis; Ultrastructure; Pregnancy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000300021

Action of cobra venom on the renal cortical tissues: electron microscopic studies
Provedor de dados: 79
Autores: RAHMY,T. R.
The effect of intramuscular (IM) injection of a sub-lethal dose of Naja haje cobra venom (0.015 mug/gm body weight) on the ultrastructure of renal cortical tissues of rabbits was studied at different time intervals after envenomation. Succinic dehydrogenase (SDH) enzyme activity was also detected in the renal cortical tubules. Three hours after venom injection, slight changes were seen in visceral cells and glomerular endothelia. The cortical tubular epithelia revealed an increase of lysosomal structures, cytoplasmic vacuolization, and nuclear irregularity. Severe ultrastructural changes were recorded 6 hours after envenomation, including hypertrophied parietal cells, blebbed visceral epithelial cells, and foot process disorganization. Dilated glomerular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Snake venom; Nephrotoxicity; Kidney; Ultrastructure.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302001000100007

IN VITRO ACTION OF COBRA VENOM ON GOAT SPERMATOZOA ULTRASTRUCTURE BY TRANSMISSION AND SCANNING ELECTRON MICROSCOPY
Provedor de dados: 79
Autores: RAHMY,T. R.; AYOUB,M. A.
Goat spermatozoa were incubated in vitro in Tris-citrate buffer, pH 7.2, containing 0, 40, 80, or 160 mug of Naja haje venom/mL buffer for 4 hours. During incubation, the percentages of sperm motility were decreased, while percentages of dead spermatozoa were increased in a time and concentration-dependent manner. The effect of venom concentrations on the ultrastructure of incubated spermatozoa was examined hourly by scanning (SEM) and transmission (TEM) electron microscopy. SEM results showed plasma membrane wrinkling at heads of some spermatozoa after 2 h incubation with 40mug venom. Most spermatozoa suffered membrane wrinkling after 4 h incubation. However, incubation with 80 mug venom caused membrane fractures in most sperm heads after 1 h incubation....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cobra venom; Ultrastructure; Goat spermatozoa; Motility; Naja haje.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0104-79302002000100011

The venom gland of the scorpion species Euscorpius mingrelicus (Scorpiones: Euscorpiidae): morphological and ultrastructural characterization
Provedor de dados: 80
Autores: Yigit,N; Benli,M.
The histology and ultrastructure of venom glands in the scorpion Euscorpius mingrelicus (Kessler, 1874) are described and illustrated in the current study for the first time by employing light microscopy and transmission electron microscopy (TEM). The venom apparatus is composed of a pair of venom glands and a stinger, both situated in the last segment of the metasoma. The venom glands are completely separate but similar. The two glands are segregated within the telson by striated muscle bundles, and their outer surfaces are surrounded by a cuticle. An internal layer constitutes the secretory epithelium. This epithelium is made up of simple columnar cells. The nucleus and organelles involved in cellular synthetic activity are situated basally. In the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Euscorpius mingrelicus; Scorpion; Telson; Venom gland; Histology; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992008000300007

Ultrastructure of the cuticle of the chalimus larva of the salmon louse Lepeophtheirus salmonis (Krøyer, 1837) (Copepoda: Caligidae)
Provedor de dados: 16
Autores: Bron, J.E.; Shinn, A.P.; Sommerville, C.
The cuticle of the chalimus II stage of Lepeophtheirus salmonis (Copepoda: Caligidae) comprised a four-layered epicuticle with a pronounced fuzzy coat which was separated from the outer and inner procuticles by a layer of transitional procuticle. The cuticle is underlain by a single-layered epidermis which overlies integumental glands and chromatophores. The structure of this cuticle is very similar to that described for free-living copepods and does not display the modifications associated with more highly transformed parasitic species.
Tipo: Article / Letter to the editor
Palavras-chave: Chalimus; Copepoda; Cuticle; Ultrastructure; Parasite.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/534341

Moulting in the chalimus larva of the salmon louse Lepeophtheirus salmonis (Copepoda, Caligidae)
Provedor de dados: 16
Autores: Bron, J.E.; Shinn, A.P.; Sommerville, C.
The ultrastructure of moulting in the chalimus phase of the parasitic caligid copepod Lepeophtheirus salmonis is described for the first time. The major features of the moult sequence correspond to those of other Crustacea, save for the absence of a distinguishable intermoult as defined by reduced epidermal activity and a cessation of cuticle production. This latter may be explained cither in terms of a continuous moulting process related to the constant food supply available to a parasite or in terms of a highly abbreviated intermoult period. The findings are discussed with respect to studies of other Crustacean species.
Tipo: Article / Letter to the editor
Palavras-chave: Chalimus; Copepoda; Moult; Cuticle; Ultrastructure; Parasite.
Ano: 2000
URL: http://www.repository.naturalis.nl/record/534408

Systematic value of the ultrastructure of the sucker surface in the squid family Mastigoteuthidae (Mollusca: Cephalopoda)
Provedor de dados: 16
Autores: Salcedo-Vargas, Mario Alejandro.
The ultrastructure of the sucker surface is described and its systematic value for mastigoteuthid squids, which bear minute suckers, is considered. An introduction to sucker terms is given and a redefinition of these terms is attempted. Using scanning electron microscopic data, two genera and four subgenera of Mastigoteuthidae from the Northwest Pacific are distinguished. The presence of “cushions” in the sucker is discussed and considered as a character important for understanding adaptations of cephalopods to the deep-sea.
Tipo: Article / Letter to the editor
Palavras-chave: Cephalopoda; Mastigoteuthidae; Systematics; Northwest Pacific; Suckers; Ultrastructure.
Ano: 1995
URL: http://www.repository.naturalis.nl/record/504384

Development, comparative morphology and cornification of reptilian claws in relation to claws evolution in tetrapods
Provedor de dados: 16
Autores: Alibardi, L.
The development of claws in different reptiles and their cornification are analyzed using histological, ultrastructural and autoradiographic methods. Claws develop at the tip of digits in relation to the growth of the terminal phalanx and appear as modified scales. The apical epidermis of digit becomes thickened and is associated with a mesenchymal condensation or a dense mesenchyme. The dorsal side of the digit becomes the unguis while the ventral side becomes the sub-unguis. The corneous layer in the unguis is thicker than in the sub-unguis and accumulates hard-keratin while corneocytes remain separated or partially fused. Bundles of hard-keratin tend to accumulate in parallel orientation with respect to the surface and are directed toward the claw tip....
Tipo: Article / Letter to the editor
Palavras-chave: Autoradiography; Claws; Cornification; Histogenesis; Reptiles; Ultrastructure; 42.82.
Ano: 2009
URL: http://www.repository.naturalis.nl/record/304588

Morphological reassessment and molecular phylogenetic analyses of Amauroderma s.lat. raised new perspectives in the generic classification of the Ganodermataceae family
Provedor de dados: 16
Autores: Costa-Rezende, D.H.; Robledo, G.L.; Góes-Neto, A.; Reck, M.A.; Crespo, E.; Drechsler-Santos, E.R.
Ganodermataceae is a remarkable group of polypore fungi, mainly characterized by particular doublewalled basidiospores with a coloured endosporium ornamented with columns or crests, and a hyaline smooth exosporium. In order to establish an integrative morphological and molecular phylogenetic approach to clarify relationship of Neotropical Amauroderma s.lat. within the Ganodermataceae family, morphological analyses, including scanning electron microscopy, as well as a molecular phylogenetic approach based on one (ITS) and four loci (ITS-5.8S, LSU, TEF-1α and RPB1), were carried out. Ultrastructural analyses raised up a new character for Ganodermataceae systematics, i.e., the presence of perforation in the exosporium with holes that are connected with hollow...
Tipo: Article / Letter to the editor
Palavras-chave: Amauroderma; Ganoderma; Polyporales; Systematics; Ultrastructure.
Ano: 2017
URL: http://www.repository.naturalis.nl/record/636793

Phylogeny of the Anomura (Decapoda, Crustacea): Spermatozoa and spermatophore morphological evidence
Provedor de dados: 16
Autores: Tudge, Christopher C.
A phylogenetic analysis of selected anomuran, thalassinidean, and other decapod crustacean taxa, based on spermatozoal ultrastructural characters and spermatophore morphological characters, was performed and the following relationships of the taxa are elucidated from the trees produced. The Anomura are not a monophyletic assemblage, with the lomoid Lomis being exclusive of the remainder of the anomuran taxa, and the thalassinid Thalassina included in the anomuran clade. The synapomorphy joining the majority of the conventional anomuran taxa ( Lomis excluded) is the cytoplasmic origin of the microtubular arms. When the palinurid and thalassinoid representatives are separately designated as outgroups, the Astacidea and Brachyura jointly formed a sister group...
Tipo: Article / Letter to the editor
Palavras-chave: Anomura; Phylogeny; Spermatozoa; Spermatophore; Ultrastructure; Hermit crabs.
Ano: 1997
URL: http://www.repository.naturalis.nl/record/534344

Morphology and distribution of antennal sensilla of Gryon gallardoi (Brèthes) (Hymenoptera: Scelionidae) females
Provedor de dados: 82
Autores: Rocha,Luciane da; Moreira,Gilson R.P.; Redaelli,Luiza R.
With the aid of scanning electron microscopy, the external morphology and distribution of the antennal sensilla were described for females of Gryon gallardoi (Bréthes), an egg-parasitoid of coreids. The geniculated and clavated antennae are composed of 12 antennomeres. Along the flagelum we registered dorsal glands and seven types of sensilla: papillary, chaetica of two sizes - long and short types, styloconic grooved-peg, sickle-shaped and trichodea with numerical and spatial variation among the flagellomeres. Functional aspects of the sensilla are discussed in the context of G. gallardoi antennal drumming behavior. Thus, the determination and the description pattern of antennal sensilla in G. gallardoi, in the present study, is an advance regarding the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Host selection; Egg parasitoid.
Ano: 2007
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2007000500013

Morphological aspects of cluster formation in the germarium of the sugarcane borer Diatraea saccharalis Fabricius (Lepidoptera: Pyralidae)
Provedor de dados: 82
Autores: Santos,Daniela C.; Gregório,Elisa A.
Diatraea saccharalis F. is one of the greatest pests of the sugar cane culture. This report aimed to characterize the germarium region of the sugarcane borer by light and transmission electron microscopy, emphasizing the morphological steps of the ovarian cluster formation. In the germarium of this insect, four zones could be morphologically identified during the cluster formation. In the most apical end of each ovariole - Zone I - the germ line stem cells undergo complete mitotic division, originating the cystoblasts. In the Zone II, each cystoblast produces a group of eight cells, the cystocytes, which are interconnected by the ring canals. Clusters containing all the cystocytes in the meiosis, characterizes the Zone III. Germ cells with ultrastructural...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ovariole; Cystoblast; Cystocyte; Ultrastructure; Insect.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1519-566X2006000500012

Spermiogenesis and spermatozoa ultrastructure in five species of the Curimatidae with some considerations on spermatozoal ultrastructure in the Characiformes
Provedor de dados: 83
Autores: Quagio-Grassiotto,Irani; Gameiro,Maria Carolina; Schneider,Tatiana; Malabarba,Luiz Roberto; Oliveira,Claudio.
Spermiogenesis in the curimatid species, Steindachnerina insculpta, Cyphocharax gillii, C. modestus, C. spilotus, and Potamorhina altamazonica, is characterized by lateral development of the flagellum, nuclear rotation, eccentric nuclear fossa formation, and chromatin compacted into thick fibers. These spermatozoa exhibit a spherical head containing a nucleus with the chromatin highly condensed into thick fibers with small electron-lucent areas, and no acrosome. The nuclear fossa is of the moderate type and eccentric and penetrated by the centriolar complex. The midpiece is small, has many elongate vesicles, and a short cytoplasmic channel. Mitochondria may be elongate, branched or C-shaped, and are separated from the initial segment of the axoneme by the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Fish; Spermatid; Sperm; Ultrastructure.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252003000100004

Sperm evolution in the family Alestidae with comparative data for the genus Chalceus (Ostariophysi: Characiformes)
Provedor de dados: 83
Autores: Santana,Júlio César de O.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani.
Spermiogenesis and spermatozoa in six genera of the African family Alestidae plus the Neotropical genus Chalceusare described. Spermiogenesis is quite similar in all Alestidae and is identified as Type I and its variants. In Type I spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus, and rotation of the nucleus towards the centriolar complex is observed. Nuclear rotation is complete reaching 90 degrees in Bryconalestes longipinnis, Brachypetersius altus, Brycinus imberi, B. lateralis, and Alestopetersius compressus; and is incomplete reaching 20 degrees in Micralestes acutidensand Rhabdalestesrhodesiensis. Spermatozoa morphology varies from a medial nucleus with fibrillar chromatin in the most basal genus Brycinusto a strongly...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: African Fish; Ostariophysi; Spermatozoa; Systematics; Ultrastructure.
Ano: 2014
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252014000200419

Sperm characteristics as additional evidence of close relationship between Lebiasina and Piabucina (Characiformes: Lebiasinidae: Lebiasininae)
Provedor de dados: 83
Autores: Santana,Júlio César de O.; Netto-Ferreira,André L.; Calcagnotto,Daniela; Quagio-Grassiotto,Irani.
Spermiogenesis and spermatozoa of representatives of the genera Lebiasina and Piabucinaare described. Spermiogenesis is quite similar among all analyzed species of these genera and is identified as Type II. In this type of spermiogenesis, the flagellum of earliest spermatids lies lateral to the nucleus. A slight movement of the nucleus towards the centriolar complex is observed. In late spermatids, the nucleus slightly elongates towards the flagellum. The formation of two striated rootlets apparently occurs in early/intermediate spermatids. The spermatozoa of species of Lebiasinaand Piabucina share (1) a drop-shaped slightly elongated nucleus that is laterally positioned relative to the flagellum; (2) a superolateral centriolar complex; (3) two striated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ostariophysi; Neotropical Fish; Spermatozoa; Systematics; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252013000300573

Light Microscopic and Ultrastructural Studies on Sarcocystis spp. Infection in Philippine Water Buffaloes (Bubalus bubalis)
Provedor de dados: 19
Autores: Claveria, Florencia G.; Cruz, Mary Jane.
Palavras-chave: Light microscopy; Ultrastructure; Sarcocystis spp.; Philippine water buffaloes.
Ano: 1999
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/312

Steroid hormone in serum of male mugil cephalus from lake quaron in relation to ultrastructure of steroidogenic secreting tissue
Provedor de dados: 20
Autores: Fahmy, A.F.; El-Gharabawy, M.M.; Assem, S.S.
The grey mullet (Mugil cephalus) is one of the most common fish species in the Mediterranean Sea. Morphological and histological studies on testes of this species indicate six successive maturity stages. The specific changes in serum sex hormone levels were found to occur during the different phases of gonadal development. Concentration of serum steroid hormone in male Mugil cephalus revealed a marked drop in serum steroid (estradiol and testosterone) hormone levels in nearly ripe stage when compared with ripe stage, while the concentration of estradiol, testosterone and progesterone at late stage (ripe stage) of sexual maturity was increased. Histological examination and cyclic change in the testes were revealed of active spermatogenesis with all...
Tipo: Journal Contribution
Palavras-chave: Field Study; Ultrastructure; Mullet fisheries; Ultrastructure; Http://aims.fao.org/aos/agrovoc/c_8045.
Ano: 2007
URL: http://hdl.handle.net/1834/2201

Descripción macroscópica de los ovarios del abadejo manchado (Genypterus blacodes). Escala de maduración
Provedor de dados: 20
Autores: Machinandiarena, L.; Villarino, M.F.; Cordo, H.D.; Macchi, G.J.; Pájaro, M.
The macroscopic ovaric stages of pink cuskeel (Genypterus blacodes) females from the Argentine Sea (SW Atlantic) are described. They were classified in five stages of development based on changes in the appearance and size of the ovary: juvenile (I), developing (II), spawning (III), spent (IV) and resting (V).
Tipo: Journal Contribution
Palavras-chave: Fecundity; Ovaries; Developmental stages; Ultrastructure; Sexual maturity; Ovaries; Developmental stages; Ultrastructure; Fecundity; Sexual maturity; Http://aims.fao.org/aos/agrovoc/c_5456; Http://aims.fao.org/aos/agrovoc/c_2230; Http://aims.fao.org/aos/agrovoc/c_8045; Http://aims.fao.org/aos/agrovoc/c_15725; Http://aims.fao.org/aos/agrovoc/c_7016.
Ano: 2003
URL: http://hdl.handle.net/1834/2421

The anatomy and ultrastructure of the proboscis in &lt;i&gt;Zonorhynchus&lt;/i&gt;-species and implications for phylogenetic relationships within the Eukalyptorhynchia Meixner, 1928 (Platyhelminthes, Rhabdocoela)
Provedor de dados: 27
Autores: De Vocht, A.J.-P.; Schockaert, E.R.
The ultrastructural morphology of the proboscis in species of the genus &lt;i&gt;Zonorhynchus&lt;/i&gt; Karling, 1952 is investigated. The proboscis epithelia are organized in four belts. The apical cone epithelium has intra-epithelial nuclei, and the distal belt of the sheath epithelium is formed by numerous cells lacking a distinct pattern. Multiciliary receptors are lacking. The diversity in ultrastructural data on the proboscis is used to elucidate the phylogenetic relationships within the Cicerinidae and Eukalyptorhynchia. A bipartite cone epithelium as found in &lt;i&gt;Zonorhynchus&lt;/i&gt;-species is a common feature for all eukalyptorhynch species investigated. A syncytial basal cone epithelium is a synapomorphic character for all species except...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Phylogeny; Proboscis; Ultrastructure; Eukalyptorhynchia; Platyhelminthes; Rhabdocoela; Zonorhynchus.
Ano: 1999
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=1116

Observations on the ultrastructure of the copulatory organ of &lt;i&gt;Archilopsis unipunctata&lt;/i&gt; (Fabricius, 1826) (Proseriata, Monocelididae)
Provedor de dados: 27
Autores: Martens, E.E.; Schockaert, E.R.
The copulatory organ in adult specimens of &lt;i&gt;Archilopsis unipunctata&lt;/i&gt; has been studied by transmission electron microscopy. This copulatory organ is of the conjuncta-duplex type with eversible cirrus. The seminal vesicle, lined with a nucleate epithelium, is surrounded by spirally arranged muscles. The fibers are enclosed in a sheath that is continuous with the septum of the bulbus and the basement lamina of the male canal epithelium. Distally to the seminal vesicle the bulbus is filled with the secretory cell-necks of the prostate glands. The male canal shows three different parts: seminal duct, ejaculatory duct and eversible cirrus. At the transition of seminal duct and ejaculatory duct two prostate ducts open into the lumen. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal reproductive organs; Ultrastructure; Archilopsis unipunctata; Proseriata; Turbellaria [Flatworms].
Ano: 1981
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3407

Comparative ultrastructure of copulatory organs having a stylet in the Proseriata (Turbellaria)
Provedor de dados: 27
Autores: Martens, E.E.
The ultrastructure of male copulatory organs having a stylet has been studied in some genera of the Proseriata. Within the Monocelididae there was a variety of stylet-like hard structures. The stylet in &lt;i&gt;Monocelis fusca&lt;/i&gt; was a differentiation of the basement membrane of the epithelium lining a penis-like muscular papilla. The penis papilla in &lt;i&gt;Ectocotyla&lt;/i&gt;consisted of circular muscles surrounded by a thickened basement membrane and an epithelium. &lt;i&gt;Archilopsis sp.&lt;/i&gt; and &lt;i&gt;Archilina sp.&lt;/i&gt; with a duplex copulatory bulb, had a stylet within a spiny cirrus. The stylet structure in &lt;i&gt;Archilina sp.&lt;/i&gt; was composed of four long spines which were derivatives of the basement membrane....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Animal reproductive organs; Ultrastructure; Proseriata; Turbellaria [Flatworms].
Ano: 1986
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=3247

Observations on the ultrastructure of the proboscis epithelia in &lt;i&gt;Polycystis naegelii&lt;/i&gt; Kölliker (Turbellaria Eukalyptorhynchia) and some associated structures
Provedor de dados: 27
Autores: Schockaert, E.R.; Bedini, C.
The epithelium of the anterior tip of the bodywall, of the proboscis cavity and of the proboscis cone in &lt;i&gt;Polycystis naegelii&lt;/i&gt; has been studied with the electron microscope. These epithelia are formed by six syncytial belts separated from each other by cellular limits: one belt belongs to the epidermis, three line the cavity and two cover the cone. The posterior belt of the cavity and those of the cone are of the insunk type bringing about a peculiar relationship between the latter two. Moreover, they are associated with muscular elements under the basal cone belt but above its basement membrane. Nine different kinds of glands have been observed erupting at the surface of the epithelia in the studied area, while six different sorts of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Skin; Ultrastructure; Polycystis naegelii.
Ano: 1978
URL: http://www.vliz.be/nl/open-marien-archief?module=ref&refid=6984

The venom apparatus and other morphological characters of the ant Martialis heureka (Hymenoptera, Formicidae, Martialinae)
Provedor de dados: 84
Autores: Brandão,Carlos Roberto Ferrreira; Diniz,Jorge Luis Machado; Feitosa,Rodrigo Machado.
We describe and illustrate the venom apparatus and other morphological characters of the recently described Martialis heureka ant worker, a supposedly specialized subterranean predator which could be the sole surviving representative of a highly divergent lineage that arose near the dawn of ant diversification. M. heureka was described as the single species of a genus in the subfamily, Martialinae Rabeling and Verhaagh, known from a single worker. However because the authors had available a unique specimen, dissections and scanning electron microscopy from coated specimens were not possible. We base our study on two worker individuals collected in Manaus, AM, Brazil in 1998 and maintained in 70% alcohol since then; the ants were partially destroyed because...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ant phylogeny; Formicidae; Martialis; Ultrastructure; Venom Apparatus.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0031-10492010002600001

Pollen morphology of Senecio bergii (Asteraceae), with special attention to the mesoaperture
Provedor de dados: 85
Autores: Montes,B; Murray,MG.
Palynological studies contribute to understanding the taxonomy, phylogeny and ecology of the Asteraceae and other families. In this study, pollen morphology and ultrastructure of the exine of Senecio bergii Hieron. were studied using light, scanning and transmission electron microscopy. The pollen of this species is prolate-spheroidal, it has a Senecioid pattern on the exine and an apertural system composed of three apertures (ecto-, meso- and endoapertures). This pollen type is defined as tricolpororate due to the triple apertural system. This is the first description of the ultra-structure of the apertural system of the pollen of Argentine species of Senecio. The presence of mesoapertures and the description of the ultrastructure of the pollen of Senecio...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Senecio; Pollen; Exine; Mesoaperture; Ultrastructure.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100027

Ultrastructure of the intercellular protuberances in leaves of Paepalanthus superbus Ruhl. (Eriocaulaceae)
Provedor de dados: 88
Autores: MACHADO,SILVIA RODRIGUES; ESTELITA,MARIA EMÍLIA M.; GREGÓRIO,ELISA APARECIDA.
Mature leaves of Paepalanthus superbus exhibit intercellular protuberances between the inner periclinal walls of the epidermal and the parenchyma cells surface, as well as on the surface of the parenchyma mesophyll cells. These structures are mostly prominent around the parenchyma cells, forming a gel capsule-like structure. Histochemical tests with ruthenium red indicate the pectic nature of the intercellular deposits, with scattered lipidic inclusions as revealed by sudan IV and sudan black B. Ultrastructural analyses show a fibrillar matrix with scattered fimbriate and tubular structures, and a distinct margin delimited by a dense membrane-like structure. Our results suggest that the protuberances are derived from secretory activity, and are formed...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Paepalanthus superbus; Ultrastructure; Intercellular; Protuberance; Leaf; Eriocaulaceae.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000400011

Anatomical and ultrastructural aspects of root and mycorrhiza of Anadenanthera peregrina (L.) Speg. var. falcata (Benth.) Altschul (Leguminosae-Mimosoideae)
Provedor de dados: 88
Autores: Gross,Eduardo; Cordeiro,Lázara; Caetano,Flávio H.
A. peregrina var. falcata form mutualistic symbiosis with arbuscular mycorrhizal fungus. An anatomical and ultrastructural study was carried out to analyze some aspects of this simbiotic association as well as some root features. The results evidenced the presence of fibers with non-lignified thicked secondary walls in the stele and sparse papillae on root surface. A. peregrina var. falcata mycorrhizas presented features of Arum-type (intercellular hyphae) and Paris-type (extensive coils) arbuscular mycorrhiza. Their general appearance with extraradical hyphae, intracellular coils, intercellular hyphae and arbuscules, is in agreement with arbuscular mycorrhizas of several plants. The ultrastructural observations showed that in intercellular hyphae and...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anadenanthera peregrina var. falcata; Anatomy; Mycorrhiza; Root; Ultrastructure.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042003000400010

Oil glands in the Neotropical genus Dahlstedtia Malme (Leguminosae, Papilionoideae, Millettieae)
Provedor de dados: 88
Autores: Teixeira,Simone de Pádua; Rocha,Joecildo Francisco.
Dahlstedtia pentaphylla (Taub.) Burkart and D. pinnata (Benth.) Malme belong to the Millettieae tribe and are tropical leguminous trees that produce a strong and unpleasant odour. In the present work, we investigated the distribution, development and histochemistry of foliar and floral secretory cavities that could potentially be related to this odour. The ultrastructure of foliar secretory cavities were also studied and compared with histochemical data. These data were compared with observations recorded for other species of Millettieae in order to gain a phylogenetic and taxonomic perspective. Foliar secretory cavities were only recorded for D. pentaphylla. Floral secretory cavities were present in the calyx, wings and keels in both species; in D....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Development; Histochemistry; Secretory cavity; Ultrastructure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000100006

Análise ultra-estrutural de folhas de três espécies de Solanaceae após inoculação com o vírus da necrose branca do tomateiro (VNBT - Tymovirus)
Provedor de dados: 88
Autores: TANAKA,FRANCISCO ANDRÉ OSSAMU; MACHADO,SÍLVIA RODRIGUES; BARRADAS,MARIA MÉRCIA.
Foi estudada a ultra-estrutura foliar das solanáceas Nicotiana glutinosa L., Lycopersicon pimpinellifolium L. e Physalis angulata L. inoculadas com o vírus da necrose branca do tomateiro (VNBT - Tymovirus). As plantas mantidas em casa-de-vegetação com temperatura constante de 25 °C foram inoculadas quando apresentavam três a quatro folhas totalmente expandidas. Quinze dias após a inoculação, foram coletadas amostras do terço médio do limbo da 3ª ou da 4ª folha a partir do ápice. As amostras foram preparadas para análise em microscopia eletrônica de transmissão segundo técnicas convencionais. A análise ultra-estrutural das células do clorênquima revelou principalmente vesiculação e vacuolação dos cloroplastos e de mitocôndrias, além da ocorrência de corpos...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tymovirus; TWNV; Solanaceae; Leaf; Ultrastructure.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042000000200006

Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafloral nectary
Provedor de dados: 88
Autores: Rocha,Joecildo Francisco; Machado,Silvia Rodrigues.
This paper reports on the extrafloral nectary (EFN) of Hibiscus pernambucensis, a native shrub species occurring in mangrove and restinga along Brazil's coastline. EFNs occur as furrows with a protuberant border on the abaxial surface veins of the leaf blade. Each nectary consists of numerous secretory multicellular trichomes, epidermal cells in palisade-like arrangements and non-vascularized parenchyma tissue. Nectar secretion is prolonged, since secretion starts in very young leaves and remains up to completely expanded leaves. Reduced sugars, lipids, and proteins were histochemically detected in all the nectary cells; phenolic substances were detected in the vacuoles of the epidermal palisade cells and in some secretory trichome cells. The secretory...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Extrafloral nectary; Hibiscus pernambucensis; Histochemistry; Ultrastructure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-84042009000300008

Ultrastructure of the eggs of two species of Anopheles (Anopheles) Meigen (Diptera, Culicidae)
Provedor de dados: 92
Autores: Sallum,Maria Anice Mureb; Flores,Daniel Corugedo.
Egg ultrastructure of two morphologicaly similar species of the Arribalzagia Series, Anopheles (A.) costai Fonseca &amp;amp; Ramos, 1939 and A. (A.) mediopunctatus (Lutz, 1903) are described and illustrated using scanning electron micrographs. Although similar in the adult stage, male genitalia structures and larval and pupal stages, the eggs of these species are distinct. The eggs of A. costai and A. mediopunctatus are compared with that of A. forattinii Wilkerson &amp;amp; Sallum, 1999. Incomplete illustration of egg of A. forattinii is provided for comparison.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anopheles; Arribalzagia; Culicidae; Egg; Ultrastructure.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262004000200005

Occurrence, morphology and ultrastructure of the Dufour gland in Melipona bicolor Lepeletier (Hymenoptera, Meliponini)
Provedor de dados: 92
Autores: Abdalla,Fábio Camargo; Cruz-Landim,Carminda da.
The occurrence, morphology and ultrastructure of the Dufour gland in Melipona bicolor Lepeletier, 1836 are presented. The Dufour gland is not present in workers. In virgin queens the gland cells show characteristics of low activity, which are described in the text. In physogastric queens the gland epithelium is higher and the cells more active than in virgin queens, showing numerous basal plasmic membrane invaginations impregnated by an electrondense material, increased apical invaginations and accumulation of substances that will be released to the gland lumen in the subcuticular space. Therefore, the data show that the Dufour gland is more developed in physogastric than in virgin queens, indicating a possible involvement of the Dufour gland in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dufour gland; Melipona bicolor; Meliponine; Morphology; Ultrastructure.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262004000100002

Morphology and fine organization of the spermatheca of Haplotropis brunneriana (Orthoptera: Pamphagidae)
Provedor de dados: 92
Autores: Li,Ke; Yang,Yujing; Mao,Lei; Zhang,Jinhui; Geng,Jianxun; Yin,Huan.
Abstract We investigated the morphology and structure of spermatheca in Haplotropis brunneriana (Orthoptera: Pamphagidae) by light and electronic microscopy. The spermatheca can be subdivided into a tubular seminal receptacle and a multiple-coiled spermathecal tube, both of which are composed of cuticular intima, epithelium layer, basal lamina and muscle layer, from inside to outside. The cuticular intima is made up of a heterogeneous endocuticle, a homogeneous exocuticle and an epicuticle, but the proportion of exocuticle in intima of the seminal receptacle is larger than that of the spermathecal tube. The epithelium layer comprises epithelial cells, gland cells and duct cells. The ultrastructural features of the epithelial cells indicated that its...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Seminal receptacle; Spermathecal tube.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262017000400323

Histopathology of Colletotrichum gloeosporioides on guava fruits (Psidium guajava L.)
Provedor de dados: 94
Autores: Moraes,Sylvia Raquel Gomes; Tanaka,Francisco André Osama; Massola Júnior,Nelson Sidnei.
Anthracnose, caused by Colletotrichum gloeosporioides, produces brown lesions on guava fruits, causing severe losses on postharvest. In this study, the infection and colonization of guava fruits by C. gloeosporioides has been examined using scanning and transmission electron microscopy. Fruits at the physiologically mature stage were inoculated with a 10(5) conidia/mL spore suspension. Afterward, fruits were incubated at 25 °C in a wet chamber for periods of 6, 12, 24, 48, 96 and 120 h to allow examination of the infection and colonization process. Conidia germination and appressoria formation occurred six hours after inoculation (h.a.i). Penetration occurred directly via penetration pegs from appressoria, which penetrated the host cuticle 48 h.a.i....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Colonization; Penetration; Pre-penetration; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-29452013000200039

External morphology of Cotesia flavipes (Hymenoptera: Braconidae) during larval development
Provedor de dados: 103
Autores: Pinheiro,Daniela O.; Rossi,Guilherme D.; Cônsoli,Fernando L.
Cotesia flavipes (Cameron, 1891) (Hymenoptera) is a gregarious endoparasitoid used in applied biological control against Diatraea saccharalis (Fabricius, 1794) (Lepidoptera). In this study, we characterize the larval external morphology and the number of instars of C. flavipes. Parasitized larvae of D. saccharalis were sampled from the 1st to the 10th day after parasitism and dissected in an anticoagulant buffer for collection of C. flavipes immatures. Immatures were processed for scanning electron microscopy. Larvae of C. flavipes were prepared in NaOH solution and slide mounted to allow for mandible size measurements. Analysis of measurements of the parasitoid larval mandible size indicated that C. flavipes has three instars. Newly hatched larvae are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anal vesicle; Biological control; Functional morphology; Ultrastructure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702010000600022

Citrus sinensis leaf petiole and blade colonization by Xylella fastidiosa: details of xylem vessel occlusion
Provedor de dados: 63
Autores: Alves,Eduardo; Leite,Breno; Pascholati,Sérgio Florentino; Ishida,Maria Lúcia; Andersen,Peter Craig.
Citrus variegated chlorosis (CVC), caused by Xylella fastidiosa, is an important disease of citrus in Brazil. X. fastidiosa is restricted to xylem vessels of plants and knowledge regarding xylem colonization is still limited. Our goal was to verify how this bacterium colonizes and spreads within xylem vessels of sweet orange Citrus sinensis cv. Pêra. Petioles and pieces of leaf blades from naturally infected plant exhibiting characteristic symptoms were prepared for light microscopy (LM), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and immunogold labeling (IGL). Petioles from healthy plants were used as control. IGL results, using an antibody against wall hemicelluloses, revealed that the pit membrane of vessels was altered....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Scanning electron microscopy; Transmission electron microscopy; Immunolabel.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-90162009000200011

กระบวนการเกิด Programmed cell death ในเซลล์ใบอ้อยที่เป็นโรคใบขาว
Provedor de dados: 106
Autores: Kanjana Kirasak; Taksina Sansayawichai; Weerapon Polrakdee.
White leaf disease of sugarcane, which is more damage to economic crops in Thailand. It is infectedby phytoplasma pathogenic and transmitted plant by leafhoppers vector. There are several symptoms that indicate the white colour, white-green and yellow leaf etc. The symptoms are affecting to sugarcane growth and yield vary according to the intensity of the symptoms. The most severe were effect on the death and no yield. There is no way the get rid phytoplasma and no disease-resistant varieties. This research leads to understand the mechanism of the effect of phytoplasma to damage sucarcane in the expression of the white leaf disease symptoms. Application for renewal of the sugarcane is the serious disease that can survive until the yield. Processes of...
Tipo: Collection
Palavras-chave: Hypersensitive response; Programmed cell death; Ultrastructure; White leaf disease; อ้อย; เซลล์ใบอ้อย; โรคใบขาวอ้อย; เชื้อไฟโตพลาสมา; อาการเซลล์ตาย; การเจริญเติบโต; ผลผลิต.
Ano: 2012
URL: http://anchan.lib.ku.ac.th/agnet/handle/001/5557

Ultraestrutura do espermatozóide de Protothaca pectorina (Lamarck) (Mollusca, Bivalvia) do litoral norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patricia; Casal,Graça; Azevedo,Carlos.
The ultrastructure of spermatozoa of the Protothaca pectorina (Lamarck, 1818) is described. The most significam differences were found in the structure and arreangement of the acrosomes, with contains two types of material, one fibrilar, the other electrondense granular. It is concluded that sperm ultrastructure is of the primitive type.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollusca; Bivalvia; Protothaca peclorina; Ultrastructure; Spermatozoa.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000400002

Ultrastructure of ovarian follicular epithelium of the amazonian fish Pseudotylosurus microps (Gunther) (Teleostei, Belonidae): I. the follicular cells cycle of development
Provedor de dados: 104
Autores: Cruz-Landim,Carminda da; Cruz-Hofling,Maria Alice da.
The present paper deals with the changes on ultrastructural features of the follicular cells along the growth of the oocyte of Pseudotylosurus microps (Gunther, 1868). The epithelium pass from single squamous to pseudostratified and finally cylindric. Remarkable are the changes in the nuclear shapes, the increasing amount of rough endoplasmic reticulum and the formation of large lipid deposits in the follicular cells by the end of vitellogenic phase. Very peculiar intercellular deposits forms between the perinucleolar and vitellogenic phase of oocyte maturation. Although largely referred to in the specialized literature, our attempts to correlate the follicular cells changes with the formation of the oocyte envelopes or even with an endocrine function are...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pseudotylosurus microps; Follicular epithelium; Ultrastructure; Teleost.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752001000100010

The ultrastructure of the mullet Mugil curema Valenciennes (Teleostei, Mugilidae) spermatozoa
Provedor de dados: 104
Autores: Eiras-Stofella,Daura Regina; Gremski,Waldemiro; Kuligowski,Sandra Maria.
The structure of the spermatozoon of Mugil curema Valenciennes, 1836 was studied using scanning and transmission electron microscopy. The spermatic head is rounded and formed by the nucleus containing granular chromatin, firmly packed resulting in a mass extremely electron dense. The acrossome is absent. The midpiece is characterized by the presence of two centrioles, a plasmatic canal, very few vesicles, and several mitochondria (9-10) with aproximately 0.50µm in diameter. The head and the midpiece are aproximately 1.56µm in diameter. The flagellum conforms to the 9 + 0 flagellar pattern near the transition region in its midpiece and is 9 + 2 from there on up to the distal region of the axoneme. The electron density in the A tubules 1, 2, 5 and 6 shows...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Mugilidae; Mullet; Mugil curema; Ultrastructure; Spermatozoa.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751993000400007

Estudo ultra-estrutural do esôfago de Trichogenes longipinnis (Britski &amp;amp; Ortega) (Pisces, Siluriformes, Trichomicteridae)
Provedor de dados: 104
Autores: Pinheiro,Nadja Lima; Mendes,Rosa Maria M.; George,Luiz Ludovico; Sales,Armando.
Trichogenes longipinnis (Britski &amp;amp; Ortega, 1983) is a leather fish restricted to the rivers on the shore in the southeast of Brazil. In this work, the oesophagous structure is being showed. The oesophagous appears itself short, dorsally inclinated toward pericardium and ventrally covered by liver lobe. By electron microscopy we can observe a mucosa layer formed by stratified squamous epithelium and lamina propria with stratum compactum. The epithelium is composed by three types of cells: superficial squamous cells; mucous cells, similar to the globet cells and polyhedric cells. The stratification of this epithelium provides a complete basal layer of proliferation polyhedric cells. The cells in the intermediate region of the epithelium are also...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisces; Trichomicteridae; Trichogenes longipinnis; Oesophagous; Ultrastructure.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751993000400008

Hemócitos fagocitários em larvas de Diatraea saccharalis (Fabricius) (Lepidoptera, Pyralidae)
Provedor de dados: 104
Autores: Falleiros,Angela M.F; Gregório,Elisa A.
The ultrastructural observation of the hemocytes of D. saccharalis larvae showed different hemocyte tvpes in various stage of interaction with microorganisms, which were interpreted as bacteria. The microorganisms were observed either free in the hemolymph or into the insect hemocytes. The bacteria were detected mostly into lhe granulocytes and plasmatocytes: the spherule cells and the oenocytoids also presented intracytoplasmic microorganisms, but less frequently. The fagocytic capacity of the different hemocyte tvpes is discussed.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lepidoptera; Pyralidae; Diairaea saccharalis; Hemocyte; Phagocytosis; Ultrastructure.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000400004

Estudo ultraestrutural da espermatogênese de Donax striatus Linnaeus (Mollusca, Bivalvia) do litoral norte do Brasil
Provedor de dados: 104
Autores: Matos,E.; Matos,P.; Corral,L.; Azevedo,C.
The fine structure of the sperm and spermatogenesis of the Donax striatus are described. The morphology of the spermatozoa is classified as of a primitive type with a head, mid-piece with four mitochondria and tail. The head shows a complex acrosome, typical of heterodont bivalves. During spermatogenesis the nuclear chromatin shows granular condensation. The present paper describes detailed observations of the espermatozoa.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Spermatozoa; Mollusca Bivalvia.
Ano: 1995
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000100021

Estrutura fina do espermatozóide de Acestrorhynchus falcatus Bloch (Teleostei, Characidae) da região norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patricia; Corral,Laura; Azevedo,Carlos.
Spermatozoa of amazon fish, Acestrorhynchus falcatus Bloch, 1794 were investigated by optical microscopy (DIC) and electron microscopy (TEM). Spermatozoa have no acrosome, the head is ovoid, and the midpiece region cylindrical, contains spherical mitochondria. The centriolar complex is located at the lateral side of the nucleus, formed by nine peripheral pairs of microtubules and arranged in a right angle to each other. The flagellum consists of nine pairs of peripheral and two central microtubules.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Teleostei; Characidae; Acestrorhynchus falcatus; Ultrastructure; Spermatozoon.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300019

Estudo ultra-estrutural do estômago de Trichogenes longipinnis (Britski &amp;amp; Ortega) (Pisces, Siluriformes, Trichomicteridae)
Provedor de dados: 104
Autores: Pinheiro,Nadja Lima; Mendes,Rosa Maria M.; George,Luiz Ludovico; Chaves,Antonio Carlos P.
The observations made about the stomach of Trichogenes longipinnis (Britski &amp;amp; Ortega, 1983) showed a rounded organ which has in its dorsal side an accessory structure - a cul de sac - that comunicates with it. The distal part of this dorsal accessory presents characteristic of an organ that exercise respiratory functions: reduction in the thickness of the mucosa and arrangement of an intrincate continuous capilar net in close contact with the superficial cells of the epithelium. In this portion there are no glands in the lamina propria. The epithelium shows a superficial squamous cels; they are very slim, and sometimes, with the capillary endothelium form a single barrier between the organ lumen and the blood. Polyhedric cells are also present in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pisces; Trichomicteridae; Trichogenes longipinnis; Stomach; Ultrastructure.
Ano: 1993
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751993000400009

Aspectos ultraestruturais do espermatozóide de Natica marochiensish (Gmelin) (MOllusca, Gastropoda) do litoral norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patricia; Casal,Graça; Azevedo,Carlos.
Spermatozoa of Natica marochienssish (Gmelin, 1791) is described by light and electron microscopy. The spermatozoon is of the primitive type with head contains a conical acrosomal complex with an acrosomal vesicle of dense matrix having a basis occupied by the subacrosomal space. The middle piece shows the centriolar complex surrounded by mitochondria and the tail contains the axoneme with a 9+2.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollusca; Gastropoda; Natica marochiensish; Ultrastructure; Spermatozoa.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000300009

Estrutura fina do espermatozóide de Mellita quinquiesperforata Leske (Echinodermata) do litoral norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patricia; Corral,Laura; Azevedo,Carlos.
The fine structure of the spermatozoon in the Mellita quinquiesperforata Leske, 1778 was studied. Collected from the Amazon region, were described by light and transmission electron microscopy. The spermatozoon consisted of a acrosome complex, nucleus, four to six mitochondria, two centrioles and flagellum. The acrosome was composed of a acrosome complex, the acrosomal vesicle and the subacrosomal space. The nucleus are composed by dense material. The middle piece contains 4-6 mitochondria which are arranged around the centrioles, the 9p+0, whose axoneme has the classic 9p+2 microtubular construction.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Equinodermata; Mellita quinquiesperforata; Ultrastructure; Spermatozoon.
Ano: 2000
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81752000000300018

Estrutura fina do espermatozóide de Tagelus plebeius (Lightfoot) (Mollusca, Bivalvia) do litoral norte do Brasil
Provedor de dados: 104
Autores: Matos,Edilson; Matos,Patrícia; Casal,Graça; Azevedo,Carlos.
It is described the sperm ultraestructure differentiation during spermiogenesis of Tagelus plebeius (Lightfoot, 1786). The spermatozoon is an uniflagellated cell of the primitive type. The head region contains a rounded or conical nucleus surrounded by acrosome. The middle piece contains four mitochondria which are arranged around the axoneme. The flagellum contains the usual microtubular axoneme.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Mollusca; Bivalvia; Tagelus plebeius; Ultrastructure; Spermatozoa.
Ano: 1997
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751997000300010

Pollen morphology of Waltheria L. (Malvaceae-Byttnerioideae) from Bahia, Brazil
Provedor de dados: 39
Autores: Silveira Júnior,Cristiano Eduardo Amaral; Lima,Luciene Cristina Lima e; Saba,Marileide Dias.
ABSTRACT Waltheria encompasses about 60 species distributed in Brazil and Mexico. To improve the palynology of the genus, we analyzed 14 species occurring in the Brazilian State of Bahia. Pollen grains were acetolyzed and examined using light microscopy and scanning electron microscopy. Non-acetolyzed pollen grains were viewed by transmission electron microscopy. The results revealed two general pollen types based on exine ornamentation, such as reticulate and echinate, which are distinct with regard to (1) size and shape, (2) apertural type and number, (3) relative length of ectoapertures, and (4) thickening of the nexine compared to the sexine. An ultrastructural analysis of the pollen wall revealed a continuous foot layer and a compact and discontinuous...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Heterostyly; Palynology; Ultrastructure; Taxonomy; Waltheria.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000400597

Ultrastructural study of ectomycorrhizas on Pinus caribaea Morelet. var. hondurensis Barr. &amp;amp; Golf. seedlings
Provedor de dados: 39
Autores: Gross,Eduardo; Casagrande,Lilian I. Thomazini; Caetano,Flávio Henrique.
The ultrastructure of ectomycorrhizas formed between Pinus caribaea var. hondurensis inoculated with Pisolithus tinctorius (Pers.) Coker &amp;amp; Couch and Telephora terrestris (Ehrenb.) Fr. was analyzed just before the transplant of these seedlings to the field to ascertain if fungi are established in the roots. Ectomycorrhizal fungi formed a well-developed compact mantle in lateral roots. Vacuoles, nuclei and dolipore septa were observed in mantle hyphae and numerous nuclei, endoplasmatic reticulum and polymorphic mitochondria were frequently located in the cytoplasm of Hartig net hyphae adjacent to plant cortical cells. Highly vacuolated cortical cells contained droplets of electron-dense material, nucleus and some organelles were observed in a narrow...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ectomycorrhiza; Pinus caribaea var. hondurensis; Ultrastructure; Pisolithus tinctorius; Thelephora terrestris.
Ano: 2004
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062004000100001

Complex sporoderm structure in bryophyte spores: a palynological study of Erpodiaceae Broth.
Provedor de dados: 39
Autores: Luizi-Ponzo,Andrea Pereira; Silva-e-Costa,Juliana da Costa.
ABSTRACT Palynological studies of bryophytes are critical for evaluating the taxonomic relevance of their spores. They also provide important support to paleoecological investigations that, usually, treat bryophytes as a whole, which does not permit the evaluation of specific functional traits of a special taxonomic unit. The present study investigated the morphology and ultrastructure of spores of five species of Erpodiaceae (Bryophyta), and assessed the implications for taxonomy and the recognition of spores of past records. Erpodiaceae includes corticolous and saxicolous plants that are widely distributed throughout tropical and temperate regions. The spores were found to be isomorphic and apolar with a subcircular amb, granulate, inaperturate. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophytes; Mosses; Palynology; Spore; Sporoderm; Ultrastructure.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000100141

Morphology and histochemistry of glandular trichomes in Hyptis villosa Pohl ex Benth. (Lamiaceae) and differential labeling of cytoskeletal elements
Provedor de dados: 39
Autores: Tozin,Luiz Ricardo dos Santos; Rodrigues,Tatiane Maria.
ABSTRACT Lamiaceae contains many species known for their aromatic properties that are produced by the production of essential oils in glandular trichomes. Hyptis is one of the most common genera of Lamiaceae in the Brazilian flora, and includes several species with medicinal value. However, studies on the morphology and functioning of their glandular trichomes are lacking. We analyzed the morphology, histochemistry and ultrastructure of the glandular trichomes in leaves of H. villosa, emphasizing the differential distribution of actin filaments and microtubules in cells secreting hydrophilic and lipophilic compounds. Four morphotypes of glandular trichomes were identified. Total lipid, terpenes, alkaloids, phenolic compounds, proteins and polysaccharides...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Actin microfilaments; Cytoskeleton; Glandular hairs; Microtubules; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300330

Spores of Plagiochila (Dumort.) Dumort.: the taxonomic relevance of morphology and ultrastructure
Provedor de dados: 39
Autores: Silva-e-Costa,Juliana da Costa; Luizi-Ponzo,Andrea Pereira.
ABSTRACT Plagiochilaceae is a family of leafy liverworts that are distributed worldwide. It is of great importance due to its taxonomic and ecological implications among bryophytes. Most species of the family belong to the genus Plagiochila, but there is no consensus regarding its infrageneric circumscription. There have been few palynological studies involving Plagiochilaceae and Plagiochila. Here, we describe the spore morphology of seventeen species of Plagiochila and discuss the taxonomic value of palynological characters for these taxa. The spores were processed by standard palynological techniques and analyzed using light and electron microscopy. The spores were found to be apolar, spheroidal, released monads that vary in size from 13µm to 58µm...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bryophytes; Liverworts; Morphology; Palynology; SEM; Taxonomy; TEM; Ultrastructure.
Ano: 2019
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062019000300391

A reduced, yet functional, nectary disk integrates a complex system of floral nectar secretion in the genus Zeyheria (Bignoniaceae)
Provedor de dados: 39
Autores: Machado,Silvia Rodrigues; Souza,Camila Vaz de; Guimarães,and Elza.
ABSTRACT The genus Zeyheria (Bignoniaceae) comprises only two species, both of which have been described as possessing a reduced and non-functional nectary disk. Despite the importance of this evolutionary change in the floral nectary, these functional assumptions have been based on disk size and on the distribution, abundance and histochemistry of corolla-borne trichomes. By combining methods on light and electron microscopy, here we investigated the functionality of the reduced nectary disk and describe all of the tissues and structures of the nectar chamber in order to determine the sites of floral nectar secretion in both Zeyheria species. . Our data find the floral nectary traits of both species to be very similar, although differing in their cellular...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bignoniaceae; Floral nectary; Functional anatomy; Histochemistry; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-33062017000300344

Palynological analysis of Sphaeropteris gardneri (Cyatheaceae, Pteridophyta)
Provedor de dados: 42
Autores: Marquez,Gonzalo J.; Morbelli,Marta A.; Giudice,Gabriela E.
The spore morphology and wall ultrastructure of Sphaeropteris gardneri (Hook.) R.M. Tryon from Brazil were analyzed with LM, SEM and TEM. The spores are trilete with an ornamentation formed of short low ridges with spines in their margins. The exospore is 2.5μm thick, two- layered in section and single or branched channels are present. The perispore is 1.2μm thick and two-layered. The inner layer has three strata: the inner stratum is formed of a network of branched and fused threads, the middle stratum has threads with a radial orientation and in the outer stratum thin, dark fibres are immersed in a less dense contrasted matrix. The outer layer of the perispore is the one that forms the echinate-ridges and is constituted of threads arranged in a compact...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Sphaeropteris; Spores; Morphology; Ultrastructure.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200012

Occurrence and evolutionary inferences about Kranz anatomy in Cyperaceae (Poales)
Provedor de dados: 42
Autores: MARTINS,SHIRLEY; ALVES,MARCCUS; SCATENA,VERA L.
ABSTRACT Cyperaceae is an angiosperm family with the greatest diversity of species with Kranz anatomy. Four different types of Kranz anatomy (chlorocyperoid, eleocharoid, fimbristyloid and rhynchosporoid) have been described for this angiosperm family, and the occurrence and structural characteristics of these types are important to trace evolutionary hypotheses. The purpose of this study was to examine the available data on Cyperaceae Kranz anatomy, emphasizing taxonomy, geographic distribution, habitat and anatomy, to infer the potential origin of the Kranz anatomy in this family. The results showed that the four types of Kranz anatomy (associated with C4 photosynthesis) in Cyperaceae emerged numerous times in unrelated phylogenetic groups. However, the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Ultrastructure; Taxonomy; Phylogeny; Cyperaceae.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652015000502177

Ultrastructural features of Mimulus aurantiacus (Scrophulariaceae) pollen tubes in vivo
Provedor de dados: 42
Autores: Ekici,Nuran; Dane,Feruzan; Olgun,Göksel.
The aim of this study is to give information on ultrastructure of in vivo pollen tubes of Mimulus aurantiacus which were collected from the Botanical Garden of the University of California at Berkeley. Materials were prepared according to electron microscopy methods and examined under Zeiss electron microscope. Four zones were examined in the pollen tubes of Mimulus aurantiacus. APICAL ZONE: Mitochondria, smooth endoplasmic reticulum, rough endoplasmic reticulum, dictyosomes and secretory vesicles were observed. SUBAPICAL ZONE: This area contained abundant rough endoplasmic reticulum and occasionally some smooth endoplasmic reticulum. The polysomes, mitochondria, proplastids that contain starch, small vacuoles and a few lipid bodies were detected. NUCLEAR...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: In vivo; Mimulus; Pollen tube; Ultrastructure.
Ano: 2009
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652009000100005

Ultrastructural studies on the sporogenous tissue and anther wall of Leucojum aestivum (amaryllidaceae) in different developmental stages
Provedor de dados: 42
Autores: Ekici,Nuran; Dane,Feruzan.
In this study, ultrastructures of anther wall and sporogenous tissue of Leucojum aestivum were investigated during different developmental stages. Cytomictic channels were seen between pollen mother cells during prophase I. Polar distribution was described in the organelle content of pollen mother cells and microspores in early phases of microsporogenesis and also in pollen mitosis. Active secretion was observed in tapetal cells. Previous reports about developmental stages of male gametophyte were compared with the results of this study.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Leucojum aestivum; Amaryllidaceae; Ultrastructure; Sporogenous tissue; Anther wall.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000400010

Handling sticky Resin by Stingless Bees: Adhesive Properties of Surface Structures
Provedor de dados: 42
Autores: GASTAUER,MARKUS; CAMPOS,LUCIO A.O.; WITTMANN,DIETER.
Many Stingless Bees (Hymenoptera: Meliponini) like Tetragonisca angustula collect resin to defend their nests against intruders like ants or Robber Bees. Small portions of resin are attached to intruders bodies and extremities causing their immobilization. It has been observed that resin is removed easily from the bee's mandible but adheres strongly to the intruder's cuticle. We tested the hypothesis that resin sticks lesser to the mandibles of Stingless Bees than to the surface of intruders due to special surface structures or adhesive properties of these structures. The surface structures of the mandible of T. angustula and the trochanter of Camponotus sericeiventris were studied by scanning electron microscopy. To measure adhesion properties, selected...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Measuring adhesion forces; Scanning electron microscopy; Surface properties; Cuticle; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000301189

Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeografic Province that produce monolete spores and its systematic implications (I): Blotiella lindeniana , Histiopteris incisa and Paesia glandulosa
Provedor de dados: 42
Autores: YAÑEZ,AGUSTINA; MARQUEZ,GONZALO J.; MORBELLI,MARTA A.
ABSTRACT The genera of Dennstaedtiaceae have sporophytes with very different morphological characteristics between each other, and this feature has made difficult the systematic circumscription of the family. This reason makes necessary the study of new characters that allow a better understanding of the relations within the group. The spore morphology and wall structure of Blotiella lindeniana, Histiopteris incisa and Paesia glandulosa from the Paranaense Phytogeographic Province were studied using light microscope, and scanning and transmission electron microscope. The exospore has two layers and, according to the species, the exospore surface bears pila, echinae, verrucae, bacula and tubercles. The perispore has two or three layers and its surface is...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ferns; Morphology; South America; Sporoderm; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000602731

Watery and dark axons in Wallerian degeneration of the opossum's optic nerve: different patterns of cytoskeletal breakdown?
Provedor de dados: 42
Autores: NARCISO,MARCELO S.; HOKOÇ,JAN NORA; MARTINEZ,ANA M. B.
In this paper we report a qualitative morphological analysis of Wallerian degeneration in a marsupial. Right optic nerves of opossums Didelphis marsupialis were crushed with a fine forceps and after 24, 48, 72, 96 and 168 hours the animals were anaesthetized and perfused with fixative. The optic nerves were immersed in fixative and processed for routine transmission electron microscopy. Among the early alterations typical of axonal degeneration, we observed nerve fibers with focal degeneration of the axoplasmic cytoskeleton, watery degeneration and dark degeneration, the latter being prevalent at 168 hours after crush. Our results point to a gradual disintegration of the axoplasmic cytoskeleton, opposed to the previous view of an "all-or-nothing'' process...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Nerve fiber; Crush lesion; Watery degeneration; Dark degeneration; Marsupial.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652001000200008

Palynological analysis of Dennstaedtiaceae taxa from the Paranaense Phytogeographic Province that produce Trilete spores II: Microlepia speluncae and Pteridium arachnoideum
Provedor de dados: 42
Autores: Yañez,Agustina; Marquez,Gonzalo J.; Morbelli,Marta A.
The spore morphology and wall ultrastructure of Microlepia speluncae and Pteridium arachnoideum from the Paranaense Province were analyzed with LM, SEM and TEM and a comparative analysis was carried out. In both species the spores are covered by a three-dimensional network of threads branched and fused, tangentially arranged to the surface, and some free-end threads are also seen. The species were differentiated by morphology and the frequency of threads fusion and the networks distribution on the surface of the spores. In both species the exospore is two-layered in section, both layers are traversed by single or branched channels. The perispore is three-layered in section: the inner layer is adhered to the exospore, the middle layer is formed of a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spores; Ultrastructure; Dennstaedtiaceae; Paranaense Province; Microlepia speluncae; Pteridium arachnoideum.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300877

Morphology and ultrastructure of megaspores and microspores of Isoetes sehnemii Fuchs (Lycophyta)
Provedor de dados: 42
Autores: Macluf,Cecilia; Morbelli,Marta; Giudice,Gabriela.
The morphology and wall ultrastructure of megaspores and microspores of Isoetes sehnemii that grows in Brazil were analyzed as part of the study of the Isoetaceae present in Southern South America. The observations were performed with light, scanning and transmission electron microscopes. The megaspores are trilete, 350-450μm in equatorial diameter. The surface is reticulate. In section, the sporoderm is 100μm thick including the ornamentation. The wall is composed of a siliceous perispore, which consists of short fused flatten, elements forming a three-dimensional mesh. The exospore has two zones of different structure. The endospore is fibrillar. The microspores are monolete, 21-27μm in equatorial diameter. The sporoderm is composed of a sporopollinic...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lycophyta; Isoetes; Brazil; Spores; Ultrastructure; Sculpture; Palynology.
Ano: 2010
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652010000200010

Anatomy and ontogeny of the pericarp of Pterodon emarginatus Vogel (Fabaceae, Faboideae), with emphasis on secretory ducts
Provedor de dados: 42
Autores: Paiva,Élder A.S.; Oliveira,Denise M.T.; Machado,Silvia R.
Discrepant and incomplete interpretations of fruits of Pterodon have been published, especially on the structural interpretation of the pericarp portion that remain attached to the seed upon dispersal. The present work clarified these doubts and analyzed ultrastructural aspects of the Pterodon emarginatus diaspores using light and transmission electron microscopes. Cell divisions are prevalent among the initial phases of development, and the subadaxial and adaxial meristems form the fibrous inner mesocarp and the endocarp composed of multi-seriate epidermis, respectively. At the median mesocarp, numerous secretory ducts differentiate between the lateral bundles, by lytic process. After lysis of the central cells and the formation of the lumen, the ducts...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pterodon emarginatus; Development; Fruit; Secretory duct; Resin; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652008000300007

Mitochondria-rich cells changes induced by nitrite exposure in tambaqui (Colossoma macropomum Cuvier, 1818)
Provedor de dados: 42
Autores: COSTA,OSCAR T.F. DA; RAMOS,CLEVERSON A.; DUNCAN,WALLICE P.; LAMEIRAS,JULIANA L.V.; FERNANDES,MARISA N.
ABSTRACT The gill mitochondria-rich cells of the juvenile Amazonian fish Colossoma macropomum were analyzed using light and scanning and transmission electron microscopy after 96 h exposure to 0.04 and 0.2 mM nitrite. Although the number of mitochondria-rich cells decreased significantly in the lamellar epithelium, no decrease was found in the interlamellar region of the gill filament. Nitrite exposure caused significant reduction on the apical surface area of individual mitochondria-rich cells (p &lt; 0.05), with a resulting reduction of the fractional area of these cells in both the lamellar and filament epithelium. Swelling of endoplasmic reticulum cisternae, nuclear envelope and mitochondria were the main changes found in the mitochondria-rich cells....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cell damage; Fish; Gills; Morphometry; Ultrastructure.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000300965

Comparative palynological analysis of Lygodium venustum Sw. and L. volubile Sw. (Lygodiaceae)
Provedor de dados: 42
Autores: GIACOSA,JUAN P. RAMOS; MORBELLI,MARTA A.; GIUDICE,GABRIELA E.
The genus Lygodium Sw. is one of the few climbing ferns in the world. The spores of L. venustum Sw. and L. volubile Sw. were studied using light, scanning, and transmission electron microscopy. This work is based on herbarium material. The spores are trilete, triangular, with straight to convex sides in polar view. The equatorial diameter is 72-104 µm, and the polar diameter is 64-84 µm. The ornamentation in L. venustum is verrucate-tuberculate while in L. volubile, it is verrucate-tuberculate in the proximal face but with a few ridges on the distal face, where a micro-ornamentation constituted by verrrucae and tubercles is observed. An equatorial ridge is also present. The exospore is two-layered; in L. venustum, it is smooth in contrast with the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lygodiaceae; Lygodium; Morphology; Spores; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000200699

Histopathological and ultrastructural characteristics of myeloid leukosis in broiler chicken
Provedor de dados: 45
Autores: Manzan,R.M.; Baccaro,M.R.; Ferreira,A.J.P.; Sinhorini,I.L.; Moreno,A.M.
An ultrastructural and histological study was performed to determine the degree of differentiation of the neoplastic cells. The histological study revealed neoplastic cells with pleomorphism, oval nuclei, prominent nucleoli, irregularly distributed chromatin, atypical mitotic figures and moderate amount of cytoplasm containing spherical eosinophilic granulations, typical features of the myeloid lineage. Ultrastructurally, there were cells with an electron-dense, oval and voluminous nucleus, with predominant euchromatin and cytoplasm containing many spherical, electron-dense and homogeneous granules, indicative of myelocytes with differentiation to eosinophils. Type-C viral particles were also seen in the intercellular space of renal tubules and inside the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chicken; Avian leukosis; Avian oncovirus; Histopathology; Ultrastructure.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352006000500009

Ultrastructure of bovine placenta during all gestational period
Provedor de dados: 45
Autores: Santos,R.B.; Silva,J.M.; Beletti,M.E.
ABSTRACT Placentas from pregnant cows with different gestation periods were used. Placental fragments of all groups were processed and evaluated by transmission electron microscopy. After fragment analysis, bovine placenta was observed to be epitheliochorial type in early pregnancy, becoming progressively sinepiteliocorial at the beginning of the second trimester. There are no ultrastructural evidences of inflammation in the region of caruncles throughout gestation, despite the invasion of caruncle proper lamina by trophoblast cells. However, throughout pregnancy and especially at the end, there were evident signs of cell degeneration in both trophoblast and the uterine epithelium. The active trophoblast cells intensely phagocytize cellular debris. There...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Bovine placenta; Ultrastructure; Maternal-fetal interaction; Cotyledon; Caruncles.
Ano: 2017
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352017000601376

Ultrastructural aspects of experimental cryptosporidiosis in pigs
Provedor de dados: 45
Autores: Bracarense,A.P.F.R.L.; Reis,A.C.F.; Sinhorini,I.L.
The aim of this work was to determine ultrastructural changes on the intestinal mucosa and associated lymphoid tissues after an experimental infection with Cryptosporidium sp. Twelve piglets dosed orally with 1×10(6) oocysts were slaughtered on days 3, 6, 9 and 12 after inoculation. The ultrastructural lesions in the intestinal cells were irregular with thickened microvilli, cytoplasmic protrusions and vacuolation, swollen mitochondria, hypertrophic organelles and nuclei. The lymphocytes of the Peyer’s patches occasionally were mitotic with a larger number of lymphoblasts in the inoculated animals.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pig; Cryptosporidiosis; Ultrastructure; Intestine.
Ano: 1999
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09351999000500008

Bovine conceptus of Bos indicus produced by somatic cell nuclear transfer and parthenogenesis present morphological variations since the blastocyst stage
Provedor de dados: 45
Autores: Oliveira,F.D.; Sangalli,J.R.; Meirelles,F.V.; Perecin,F.; Silva Filho,P.P.C.; Watanabe,Y.F.; Miglino,M.A.; Assis Neto,A.C.
In cattle, embryo development is characterized by the appearance of two distinct cell layers, the trophectoderm and the inner cell mass. The latter will undergo differentiation to form the embryonic disc consisting of the epiblast and hypoblast. The aim of this study was to ultrastructurally characterize the bovine embryo from different in vitro production techniques, with emphasis on trophectoderm and inner cell mass cells. Bovine embryos on day 7 (conception = D1) of pregnancy, derived via in vitro production techniques, were fixed for light and transmission electron microscopy processing. Results suggested that embryos produced by nuclear transfer of somatic cells and parthenogenesis showed significant changes in macroscopic and microscopic structure....
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Embryo; Blastocyst; In vitro production; Ultrastructure.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352015000601483

Sperm ultrastructure and spermatogenesis in the lizard, Tropidurus itambere
Provedor de dados: 47
Autores: Ferreira,Adelina; Dolder,Heidi.
Spermatogenesis, with emphasis on spermiogenesis, is described for the lizard, Tropidurus itambere, using light microscopy, phase contrast and epifluorescence, as well as scanning and transmission electron microscopy. Cellular differentiation involves events of chromatin condensation, nuclear elongation and the formation of structural complexes, such as the acrosomal and axonemal ones. Other new characteristics, exclusive for this species, include various aspects of the subacrosomal granule, the insertion of the pro-acrosomal vesicle and the development of these structures to participate in the acrosomal complex. Radial projections occur just above the nuclear shoulders, which have been recognized already from the beginning of cellular elongation. The...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Sperm; Spermatogenesis; Lizard; Tropiduridae.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300006

Spherites in the midgut epithelial cells of the sugarcane borer parasitized by Cotesia flavipes
Provedor de dados: 47
Autores: de Oliveira Pinheiro,Daniela; Conte,Hélio; Aparecida Gregório,Elisa.
Diatraea saccharalis, the main pest of sugarcane, has been controlled by Cotesia flavipes. Very little is known about the effect of parasitism on the host organs, including the midgut. The Lepidoptera midgut epithelium is composed of columnar, goblet, regenerative, and endocrine cells. Spherites have been described in columnar and regenerative cells of several Lepidoptera species, and presented a lot of functional meaning. We identified spherites in the midgut epithelial cells of non-parasitized D. saccharalis larvae analyzed the effect of parasitism on spherite morphology and distribution along the length of the midgut. Midgut fragments of both non-parasitized and parasitized larvae were processed for transmission electron microscopy. All the midgut...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spherite; Epithelial cell; Ultrastructure; Lepidoptera; Parasitism.
Ano: 2008
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452008000100007

Seasonal testicular changes in Dendropsophus minutus Peters, 1872 (Anura, Hylidae)
Provedor de dados: 47
Autores: Ferreira,Adelina; Mehanna,Mahmoud.
The reproductive cycle in anurans may be either continuous or discontinuous. These differences may be connected to seasonal climate changes and/or to anthropic activity. Forty adult male individuals of the Dendropsophus minutus species were collected during one year, in the municipality of Chapada dos Guimarães (Mato Grosso, Brazil). The testicles were studied under light and transmission electron microscopy. No variations were observed when the diameter of the seminiferous tubules and the thickness of the interstitial tissue were studied. However, changes in spermatogenesis were conspicuous and indicated that the reproductive cycle of D. minutus in Chapada dos Guimarães is discontinuous and seems related to variations in air temperature and rainfall.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatogenesis; Reproduction; Anura; Ultrastructure; Chapada dos Guimarães.
Ano: 2012
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452012000200002

Structure of the stigma and style in sunflower (Helianthus annuus L.)
Provedor de dados: 47
Autores: Gotelli,M.M.; Galati,B.G.; Medan,D.
This is the first report of the ultrastructure of the stigma and style during and after anthesis in Helianthus annuus L. using light and transmission electron microscopy. The stigma is bifid with unicellular papillae. There is no secretion of lipids, carbohydrates or proteins at anthesis. The style is semisolid in the upper portion, closer to the stigma, and becomes solid below. Ultrastructural changes on cells of the stigma and the style are described. The transmitting tissue of the ovule is first evident 40 minutes after pollination and persists during the first stages of embryogenesis. Only one pollen tube per micropyle was observed growing through this tissue.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Gynoecium; Ovule; Transmitting tissue.
Ano: 2010
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452010000300005

Ultrastructural analysis and identification of membrane proteins in the free-living amoeba Difflugia corona
Provedor de dados: 47
Autores: Silva-Briano,Marcelo; Martínez-Hernández,Sandra Luz; Adabache-Ortíz,Araceli; Ventura-Juárez,Javier; Salinas,Eva; Quintanar,J. Luis.
Syntaxin-1 and 25-kDa Synaptosome-associated Protein (SNAP-25) are present in the plasma membrane of several different secretory cell types and are involved in the exocytosis process. In this work, the free-living amoeba Difflugia corona was studied in relation to ultrastructure, structural membrane proteins, and proteins such as Syntaxin-1 and SNAP-25. Our results obtained by scanning electron microscopy in the amoeba without its theca, showed many membrane projections and several pore-like structures. Using immunocytochemistry, we found structural proteins Syntaxin-1 and SNAP-25.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amoeba; Membrane proteins; Pore-like; Theca; Ultrastructure.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452007000200004

Structural and ultrastructural characterization of zebu (Bosindicus) spermatozoa
Provedor de dados: 47
Autores: Aquino Luque,Maria Carolina; Báo,Sônia Nair.
The ultrastructure of normal, ejaculated spermatozoa of Bos indicus was studied by means of electron microscopy, being evaluated in two principal parts, the head and the tail. The head is flat, oval or paddle-shaped with a square base, which provides a concave recess for the insertion of the tail. The acrosome tightly covers the anterior two thirds of the nucleus. A distinct unilateral acrosomal bulge was observed along the apical edge of the head. The equatorial region demarcates the acrosome from the post-equatorial region that covers the caudal one third of the nucleus. The classical 9+9+2 fiber pattern which composes the axoneme was observed along three segments of the tail, namely middle, principal and terminal pieces. The axoneme is anteriorly bound...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Spermatozoon; Ultrastructure; Bos indicus.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000100005

Cytochemical localization of acid phosphatase in Stigeoclonium tenue (Chaetophorales, Chlorophyceae)
Provedor de dados: 47
Autores: Michetti,Karina M.; Leonardi,Patricia I.; Cáceres,Eduardo J.
Nonspecific acid phosphatases are a group of enzymes whose activity increases the availability of exogenous and endogenous orthophosphate either through extra- or intracellular hydrolysis of phosphate compounds. Our study demonstrates the activity of acid phosphatases in the filamentous freshwater alga Stigeoclonium tenue. These enzymes were detected following a cerium-based method in which cerium was used as an orthophosphate-capture reagent. In thalli from S. tenue from the natural environment, acid phosphatases were found in the longitudinal cell wall, plasmalemma, and vacuole. In thalli from Bold's Basal Medium culture, these enzymes were found mainly in the plasmalemma; they were scarce in the cell wall. In the thalli grown in phosphate-enriched...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Chaetophorales; Acid phosphatase; Stigeoclonium tenue; Ultrastructure.
Ano: 2006
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000300009

An ultrastructural study of spermiogenesis in two species of Sitophilus: Coleoptera: Curculionidae
Provedor de dados: 47
Autores: Name,Khesller Patrícia Olázia; Dos Reis,Giuliano Pagy Felipe; Báo,Sônia Nair.
The spermiogenesis of Sitophilus zeamais and Sitophilus oryzae, the maize and the rice weevil, respectively, was studied by light microscopy and scanning and transmission electron microscopy. Sitophilus spp. is the most widespread and destructive primary pest of stored cereals in the world. The spermiogenesis occurs within cysts. There are approximately 256 germ line cells per cyst. Inside each cysts, all the spermatids are in the same stage of maturation. The ultrastructure of the spermatozoa of S. zeamais and S. oryzae is similar to that described for other beetles. The head is formed by a three-layered acrosome with the perforatorium, the acrosomal vesicle, the extra-acrosomal layer and the nucleus. The flagellum has the typical axoneme formed by a...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Curculionidae; Sitophilus; Spermiogenesis; Insect sperm; Ultrastructure.
Ano: 2007
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452007000200005

Protein detection in spermatids and spermatozoa of the butterfly Euptoieta hegesia (Lepidoptera)
Provedor de dados: 47
Autores: Mancini,Karina; Dolder,Heidi.
This study was undertaken to detect protein components in both sperm types of the butterfly Euptoieta hegesia. These spermatozoa possess complex extracellular structures for which the composition and functional significance are still unclear. In the apyrene sperm head, the proteic cap presented an external ring and an internal dense content; basic proteins were detected only in external portions. In the tail, the paracrystalline core of mitochondrial derivatives and the axoneme are rich in proteins. The extratesticular spermatozoa are covered by a proteic coat, which presented two distinct layers. In eupyrene spermatozoa, acrosome and nucleus were negatively stained, probably because of their high compaction. In the tail, there is no paracrystalline core...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ultrastructure; Protein; Apyrene; Eupyrene.
Ano: 2004
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452004000300006

Ultrastructural effects of two phthalocyanines in CHO-K1 and HeLa cells after laser irradiation
Provedor de dados: 47
Autores: de CastroPazos,Marcelo; Pacheco-Soares,Cristina; Soares da Silva,Newton; DaMatta,Renato Augusto; Pacheco,Marcos Tadeu T.
The effects of Photodynamic Therapy using 2nd generation photosensitizers have been widely investigated aiming clinical application treatment of solid neoplasms. In this work, ultrastructure changes caused by the action of two 2nd generation photosensitizers and laser irradiation on CHO-K1 and HeLa (neoplastic) cells were analyzed by transmission electron microscopy. Aluminum phthalocyanine chloride, aluminum phthalocyanine tetrasulfonate chloride and radiation from a semiconductor laser at a fluency of 0.5 J/cm² (Power=26mW; l=670nm) were used. The results showed induction of apoptosis. Such alterations where observed in HeLa but not in CHO-K1 cells after Aluminum phthalocyanine tetrasulfonate chloride (AlPcS4) photodynamic treatment. The Aluminum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Photodynamic therapy; Phthalocyanines; Laser; Cell death; Ultrastructure.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000300001

Structure of the kidney of Bufo arenarum: Intermediate segment, distal tubule and collecting tubule
Provedor de dados: 47
Autores: Farías,Alejandro; Hermida,Gladys Noemí; Fiorito,Luisa Eleonora.
The ultrastructure of the intermediate segment (IS), distal tubule and collecting tubule (CT) of the south american toad Bufo arenarum, was studied by light and transmission electron microscopy. The IS is composed of cubical ciliated cells which propel the urine along the renal tubule. The distal tubule is divided into two portions: the early distal tubule (EDT) and the late distal tubule (LDT). The EDT is characterized by only one type of cells with well developed basolateral interdigitations and numerous elongated mitochondria, which are oriented normal to the basal surface. The "macula densa - like" is a specialized zone of the EDT in contact with the vascular pole, where cells are more tightly packed than in the rest of the tubule. The LDT shows two...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Amphibia; Kidney; Ultrastructure; Renal tubules.
Ano: 2003
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452003000100003

Microanatomical characteristics of marginal ommatidia in three different size-classes of the semi-terrestrial isopod Ligia exotica (Crustacea; Isopoda)
Provedor de dados: 47
Autores: Keskinen,Essi; Takaku,Yasuharu; Meyer-Rochow,Benno; Hariyama,Takahiko.
The aims of this paper have been (a) to characterize marginal ommatidia from different eyeregions through a detailed description of their distinct ultrastructural features in three different size-classes ofL. exotica, and (b) to compare microanatomical characteristics of the marginal ommatidia with those of ommatidia of the same eye, but located further centrally. On the basis of transverse as well as longitudinal sections we conclude that new ommatidia are added from a crescentic dorso-anterio-ventral edge of the eye and that maturing ommatidia go through a sequence in which originally the nuclei of cone -, pigment-, and retinula cells are arranged in three separate layers. At the beginning of the microvillar development, the organization of the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustaceans; Eye; Retina; Vision; Growth; Moulting; Ultrastructure.
Ano: 2002
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452002000300006

Fine structural analysis of the epithelial cells in the hepatopancreas of Palaemonetes argentinus (Crustacea, Decapoda, Caridea) in intermoult
Provedor de dados: 47
Autores: Sousa,Liliana G.; Cuartas,Elena I.; Petriella,Ana María.
The aim of this study is to describe the ultrastructure of the hepatopancreas of P. argentinus in intermoult. P. argentinus hepatopancreas was studied using standard TEM techniques. Each tubule consists of four cellular types: E (embryonic), F (fibrillar), R (resorptive) and B (blister like). E-cells have embryonic features and some of them were found in mitosis. F, R and B cells possess an apical brush border. F-cells have a central or basal nucleus, a conspicuous RER, and dilated Golgi cisternae. R cells show a polar organization of organelles in three areas: apical, with numerous mitochondria and sER tubules, a central area with the nucleus and RER, and a basal area containing a sER-like tubule system and mitochondria. B-cells were observed at different...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Crustacea; Caridea; Hepatopancreas; Ultrastructure.
Ano: 2005
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452005000100004

Some ultrastructural observations of the vegetative, resting and excysting ciliate, urostyla grandis (urostylidae, hypotrichida)
Provedor de dados: 48
Autores: LIU,ZHAO; YI-SONG,LI; JUN-GANG,LI; FU-KANG,GU.
In order to reveal the differentiation characteristics of organelles of ciliates under different physiological status, the cellular ultrastructure of Urostyla grandis was studied by transmission electron microscopy. In the resting cells most ciliary shafts, kinetosomes and sub-pellicle microtubules were resorbed, and the endoplasmic reticulum (ER) disappeared with the autophagocytosis taking place within the cytoplasm. As well, the nuclear matrix of the macronucleus was extruded into the cytoplasm, forming pseudopodia-like structures with large quantities of heterochromatin (CH) attached to the inner nuclear membrane. During excystment, membraneous structures developed and gradually increased in number to form the ER. Autophagic vacuoles (AVs) appeared...
Tipo: Journal article
Palavras-chave: Urostyla grandis; Ultrastructure; Vegetative cell; Resting cell; Excysting cell.
Ano: 2009
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602009000400001

A light- and electron microscopic study of primordial germ cells in the zebra fish (Danio rerio)
Provedor de dados: 48
Autores: Deniz Koç,Nazan; Yüce,Rikap.
In sexually reproducing organisms, primordial germ cells (PGCs) give rise to the cells of the germ line, the gametes. In many animals, PGCs are set apart from somatic cells early during embryogenesis. This study explores the origin of primordial germ cells (PGCs) of the zebra fish and examines their morphology during early development (1st day-15th day). PGCs were selectively stained by the alkaline phosphatase histochemical reaction and viewed by light and electron microscopy from the time they are first detectable in the yolk sac endoderm. PGCs occurred in the subendodermal space on the syncytial periblast; differing from the surrounding endodermal cells. Later the PGCs moved to between the blastoderm and yolk sac and transferred to the dorsal mesentery...
Tipo: Journal article
Palavras-chave: Primordial germ cell; Zebra fish; Ultrastructure; Morphology.
Ano: 2012
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-97602012000400001

The genus Tryblionella W. Smith (Bacillariaceae, Bacillariophyta) in southern Brazil salt marshes
Provedor de dados: 49
Autores: Bertolli,Lucielle Merlym; Talgatti,Dávia Marciana; Nascimento,Thamires Mariah da Silveira; Torgan,Lezilda Carvalho.
Abstract: Tryblionella is a large epipelic genus, widespread from fresh to marine waters. Most of the studies including the genus are based only in light microscopy. Few recent studies are exclusively dedicated to Tryblionella and the ultrastructure of some species is still little known. In this paper we present eleven species of Tryblionella found in epiphyton and microphytobenthos in Patos Lagoon salt marshes. All the species are described, illustrated in light and scanning electron microscopy and comments about their taxonomy, distribution and ecology are provided. Two taxa are reported for the first time in the State of Rio Grande do Sul and one in Southern Brazil. The number of species registered in this study comprises nearly a half of the number of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatoms; Patos Lagoon; Periphyton; Taxonomy; Ultrastructure.
Ano: 2020
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032020000100204

Melosira (Diatomeae) taxa from the Iguaçu River in southern Brazil
Provedor de dados: 49
Autores: Nardelli,Margaret Seghetto; Tremarin,Priscila Izabel; Ludwig,Thelma Alvim Veiga; Bueno,Norma Catarina.
Abstract The study of the genus Melosira in plankton samples from the lower Iguaçu River revealed the presence of four taxa: Melosira undulata (Ehrenberg) Kützing var. undulata, M. undulata var. normanni Arnott, M. varians C. Agardh and M. muscigena Iwahashi. We present illustrations of the frustules using light microscopy (LM), descriptions, and comments about the morphology of the four taxa. The analysis of Melosira muscigena under scanning electron microscopy revealed unprecedented details of the ultrastructure, such as the shape and distribution of the rimoportulae at the valve mantle. This is the first record of Melosira undulata var. undulata and the second of M. muscigena in Brazil.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Diatoms; Southern Brazil; Taxonomy; Ultrastructure.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032016000400202

Gomphonema Ehrenberg (Bacillariophyceae, Gomphonemataceae) of the São Francisco Falso River, Paraná, Brazil
Provedor de dados: 49
Autores: Medeiros,Gabriela; Amaral,Mailor Wellinton Wedig; Ferreira,Paula Carolina; Ludwig,Thelma Veiga; Bueno,Norma Catarina.
Abstract: Gomphonema Ehrenberg is a genus well represented in periphytic algal flora of epicontinental environments. The substrate colonization is facilitated by the secretion of mucilage by the pore field, allowing cell adhesion. Samples were scraped off and analyzed from vegetative portions of the macrophyte Eichhornia azurea Kunth, collected in São Francisco Falso River, located in Santa Helena City, Paraná State. The sampling occurred in four different sites, in four different periods, totaling 16 samples. The quantitative material analysis resulted in 28 identified taxa, in which Gomphonema brasiliense ssp. pacificum, Gomphonema neoapiculatum Lange-Bertalot, Reichardt &amp; Metzeltin Gomphonema pantropicum Reichardt and Gomphonema perapicatum...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Lotic environment; Diatoms; Taxonomy; Ultrastructure.
Ano: 2018
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1676-06032018000300205

Morphology and ultrastructure of Schizaea fistulosa (Schizaeaceae) spores from Chile
Provedor de dados: 51
Autores: Ramos Giacosa,Juan P; Morbelli,Marta A; Giudice,Gabriela E.
The spores of Schizaea fistulosa from Chile were studied using light microscopy (LM), scanning (SEM) and transmission electron microscopy (TEM). The spores are monolete and elliptic in polar view. The major equatorial diameter is 71-85 µm and the polar diameter is 54-61 µm. The laesurae are 50-60 µm long and, in some cases, bifurcated. The sporoderm ultrastructure is first mentioned and described here. The exospore is two-layered in section, verrucate-tuberculate with single or fused elements forming short ridges. The perispore is single-layered, 10-30 nm thick and it is only visible under transmission electron microscopy. On the spore surface, numerous, single or fused, spheroids and nanospheroids of different sizes were observed attached to the perispore...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Schizaeaceae; Schizaea fistulosa; Spores; Morphology; Ultrastructure.
Ano: 2015
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-23722015000100003

Submicroscopical Features of Leaves of Xyris Species
Provedor de dados: 52
Autores: Sajo,Maria das Graças; Machado,Silvia Rodrigues.
The leaf ultrastructure of five Xyris species were examined using scanning electron microscope (SEM), transmission electron microscope (TEM) and histochemical methods. All studied leaves show some features in epidermis and mesophyll, which were of considerable adaptative significance to drought stress. Such features included the occurrence of a pectic layer on the stomatal guard cells and the presence of a network of pectic compounds in the cuticle. Pectic compunds were also in abundance in lamellated walls of the mesophyll cells and on the inner surface of the sclerified cell walls of the vascular bundle sheaths. There were also specialized chlorenchymatous "peg cells" in the mesophyll and drops of phenolic compounds inside the epidermal cells.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Xyris; Ultrastructure; Leaf.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132001000400011

Seminal analysis, cryogenic preservation, and fertility in matrinxã fish, Brycon cephalus (Günther, 1869)
Provedor de dados: 52
Autores: Ninhaus-Silveira,Alexandre; Foresti,Fausto; Veríssimo-Silveira,Rosicleire; Senhorini,José Augusto.
Aiming to improve fish reproduction techniques, the characterization and cryopreservation of semen of Brycon cephalus were performed. The seminal characteristics observed were: an almost transparent, milky semen with a mean volume of 4mL, and sperm concentration of 9.617±1.630 x 10(6) spermatozoa/mm³. Spermatozoa (length = 31.288 ±4.47µm) were of the aquasperm type and displayed a small, round head (length = 1.727 ±0.18 µm; width = 1.752 ±0.17µm) without acrosomal vesicle, nucleus with highly condensed chromatin forming coarse clots and centriolar complex located in the nuclear fossa; a midpiece (length = 2.561±0.44µm), narrowed rearward, with a cytoplasmic canal; and a flagellum (length = 29.521 ±4.37µm). Fertilization tests with thawed semen demonstrated...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Semen characteristics; Cryopreservation; Brycon cephalus; Ultrastructure; Fish.
Ano: 2006
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132006000500015

Bulliform cells in Loudetiopsis chrysothrix (Nees) Conert and Tristachya leiostachya Nees (Poaceae): structure in relation to function
Provedor de dados: 52
Autores: Alvarez,Juliana Magalhães; Rocha,Joecildo Francisco; Machado,Silvia Rodrigues.
This work reports anatomic and ultrastructural characteristics of bulliform cells in Loudetiopsis chrysothrix (Nees) Conert and Tristachya leiostachya Nees. Both the species presented leaf rolling under water stress. The main characteristics observed in these cells were: periclinal wall thinner than the adjacent epidermal wall; abundance of pectic substances in cuticular layer; sinuous anticlinal walls with ramified plasmodesmata; vacuome formed by a developed vacuole or innumerous small vacuoles; abundance of phenolic substances and oil drops. These characteristics suggested the involvement of bulliform cells in the mechanism of foliar involution in the studied species.
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Bulliform cells; Cerrado; Poaceae; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100014

Identification of Primordial Germ Cells: Cytological, Histological and Immunohistochemical Aspects
Provedor de dados: 52
Autores: Yön,Nazan Deniz; Akbulut,Cansu.
Primordial germ cells (PGCs) constitute an embryonic cell type that migrate to gonadal precursors and form the gametes. In many animals, PGCs are set apart from somatic cells early during embryogenesis. These cells migrate to gonadal precursors and then constitute gonads so they are useful models for cell motility studies. They have a highlighted importance for development and reproduction studies. Primordial germ cells have morphological differences from the somatic cells. Structure of these cells can be detected with light and electron microscopy in early development stages. This review describes the morphological, histological, molecular and ultrastructural features of primordial germ cells in different animals and gives an overview for simplified...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Primordial germ cells; Ultrastructure; Histology; Morphology.
Ano: 2015
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132015000200222

Ultrastructural analysis of kidney, liver and duodenum isolated from treated rats with Ginkgo Biloba extract and effects of this medicinal plant on the biodistribution of the padiopharmaceutical sodium pertechnetate
Provedor de dados: 52
Autores: Moreno,Silvana Ramos Farias; Carvalho,Jorge José de; Nascimento,Ana Lúcia; Arnobio,Adriano; Olej,Beni; Timóteo,Margareth de Oliveira; Caldas,Luiz Querino de Araújo; Bernardo Filho,Mário.
Ginkgo biloba extract (EGb) has been used to treat memory and concentration deficits, acts as platelet activating factor antagonism and prevents against damages caused by free radicals. EGb is a standardized extract that contains 24% flavonoids and 6% terpenoids. The aim of this work was to evaluate the possible influence of an EGb on the ultrastructure of some organs isolated from rats and on the biodistribution of sodium pertechnetate (99mTcO4Na). The animals were treated with EGb and after six days, received 99mTcO4Na. The organs were isolated and fixed for ultrastructural analysis. The results showed that EGb has modified the ultrastructure of kidney, liver and duodenum and altered the biodistribution of 99mTcO4Na (P&lt;0.05). It is speculated that the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Ginkgo biloba; Technetium-99m; Biodistribution; Morphology; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000700030

Storage sites in seeds of Caesalpinia echinata and C. ferrea (Leguminosae) with considerations on nutrients flow
Provedor de dados: 52
Autores: Teixeira,Simone de Pádua; Machado,Sílvia Rodrigues.
The seeds of Caesalpinia echinata and C. ferrea behaved as typical endospermic seeds, despite their different morphological classification (exendospermic seeds were described for C. echinata and endospermic seeds for C. ferrea). Then, the aim of this work was to compare, under ultrastructural and histochemical terms, the nature of the storage substances and their accumulation sites, as well as the nutrient flow in seeds of these species. Cotyledons in C. echinata accumulate carbohydrates, lipids and proteins, which are mobilized from the outer to the inner parts as revealed by the position of plasmodesmata. Endosperm in C. ferrea accumulates carbohydrates and in C. echinata accumulates substances during the initial embryogenic phases. Such tissue develops...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Cotyledon; Embryo; Endosperm; Histochemistry; Reserve substances; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000100016

Optical and ultrastructural study of the pollen grain development in hermaphrodite papaya tree (Carica papaya L.)
Provedor de dados: 52
Autores: Santos,Lídia Márcia Silva; Pereira,Telma Nair Santana; Souza,Margarete Magalhães de; Damasceno Junior,Pedro Correa; Costa,Fabiane Rabelo da; Ribeiro,Beatriz Ferreira; Freitas,Noil Gomes de; Pereira,Messias Gonzaga.
The objective of this study was to describe the pollen grain development in hermaphrodite papaya tree. The flower buds were collected at different stages of the development and the anthers were treated chemically for observation under optical and electronic transmission microscopes. The pollen grain development followed the normal pattern described for the Angiosperms. The pollen grain development was described from meiocyte to the mature pollen grain. In the microsporogenesis, the microspore mother cells or the meiocytes underwent meiosis giving rise to the tetrads that were enclosed by the calose. Later, the tetrads were released by the dissolution of the calose by calase activity and microspores underwent mitosis. Microgametogenesis was characterized by...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Carica papaya; Microsporogenesis; Microgametogenesis; Pollen grain; Ultrastructure.
Ano: 2008
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132008000300013

Dufour glands in the hymenopterans (Apidae, Formicidae, Vespidae): a review
Provedor de dados: 57
Autores: ABDALLA,F. C.; CRUZ-LANDIM,C. da.
Associated to the sting apparatus of the aculeate hymenopterans is found the poison gland, originated from the glands associated to the ovipositor of the non-aculeate hymenopterans and the less derived Dufour gland, homologue of the coletterial gland of other insects, and found in all hymenopteran females. The Dufour gland functions is mostly uncertain in hymenopterans but in ants it is involved with communication and defense and in non social bees with the nest building and protection. In wasps possibly with kin-recognition. Differences in morphology and chemical composition of the gland secretion were observed among species, in the same species, between the castes in the social species and among individual of the same caste playing different tasks or...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Dufour gland; Hymenopterans; Morphology; Pheromones; Ultrastructure.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0034-71082001000100013

Experimental chronic entrapment of the sciatic nerve in adult hamsters: an ultrastructural and morphometric study
Provedor de dados: 56
Autores: Prinz,R.A.D.; Nakamura-Pereira,M.; De-Ary-Pires,B.; Fernandes,D.S.; Fabião-Gomes,B.D.S.V.; Bunn,P.S.; Martinez,A.M.B.; Pires-Neto,M.A.; Ary-Pires,R.
Entrapment neuropathy is a group of clinical disorders involving compression of a peripheral nerve and interference with nerve function mostly through traction injury. We have investigated the chronic compression of peripheral nerves as an experimental procedure for detecting changes in ultrastructural nerve morphology. Adult hamsters (Mesocricetus auratus, N = 30) were anesthetized with a 25% pentobarbital solution and received a cuff around the right sciatic nerve. Left sciatic nerves were not operated (control group). Animals survived for varying times (up to 15 weeks), after which they were sacrificed and both sciatic nerves were immediately fixed with a paraformaldehyde solution. Experimental nerves were divided into segments based upon their distance...
Tipo: Info:eu-repo/semantics/other
Palavras-chave: Nerve entrapment; Ultrastructure; Morphometry; Hamster; Renaut body.
Ano: 2003
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2003000900015

Effect of different durations of overdistention on rat bladder function and morphology
Provedor de dados: 56
Autores: Jin,Xiao-Dong; Cao,Min; Zhou,Xie-Lai; Yin,Hong-Ping; Chen,Zhao-Dian; Xu,Ning; Jiang,Hai.
We investigated the contribution of the duration of overdistention (DOD) to rat bladder function and morphology and explored its possible molecular mechanisms. Bladder overdistention was induced in male Sprague-Dawley rats (200-250 g) by an infusion of saline. Forty rats were divided into 5 groups submitted to different DOD, i.e., 1, 2, 4, and 8 h, and control. Bladder function was evaluated by cystometry. Morphological changes were observed by light and transmission electron microscopy. Compared to control (44.567 ± 3.472 cmH2O), the maximum detrusor pressure of groups with 2-, 4- and 8-h DOD decreased significantly (means ± SEM): 32.774 ± 3.726, 31.321 ± 2.847, and 29.238 ± 3.724 cmH2O. With the increase of DOD, inflammatory infiltration and impairment...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Acute urinary retention; Bladder overdistention; Urodynamics; Ultrastructure; Apoptosis; Rat.
Ano: 2012
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2012001000006

Morphometric and ultrastructural analysis of different pituitary cell populations in undernourished monkeys
Provedor de dados: 56
Autores: Cónsole,G.M.; Jurado,S.B.; Oyhenart,E.; Ferese,C.; Pucciarelli,H.; Gómez Dumm,C.L.A.
Undernutrition elicited by a low-protein diet determines a marked reduction of hypophyseal activity and affects the function of the respective target organs. The objective of the present investigation was to study the ultrastructural and quantitative immunohistochemical changes of the different pituitary cell populations in undernourished monkeys that had been previously shown to have significant changes in craniofacial growth. Twenty Saimiri sciureus boliviensis monkeys of both sexes were used. The animals were born in captivity and were separated into two groups at one year of age, i.e., control and undernourished animals. The monkeys were fed ad libitum a 20% (control group) and a 10% (experimental group) protein diet for two years. Pituitaries were...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pituitary gland; Quantitative immunohistochemistry; Ultrastructure; Undernutrition; Squirrel monkeys.
Ano: 2001
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2001000100008

Protective role of antioxidant vitamin E and catechin on idarubicin-induced cardiotoxicity in rats
Provedor de dados: 56
Autores: Kalender,S.; Kalender,Y.; Ates,A.; Yel,M.; Olcay,E.; Candan,S.
Idarubicin is an anthracycline antibiotic extensively used in acute leukemia. In the present study we investigated whether vitamin E and catechin can reduce the toxic effects of idarubicin. Vitamin E (200 IU kg-1 week-1), catechin (200 mg kg-1 week-1), idarubicin (5 mg kg-1 week-1), idarubicin + vitamin E (200 IU kg-1 week-1), and idarubicin + catechin (200 mg kg-1 week-1) combinations were given to male Sprague-Dawley rats weighing 210 to 230 g (N = 6/group). Idarubicin-treated animals exhibited a decrease in body and heart weight, a decrease in myocardial contractility, and changes in ECG parameters (P&lt;0.01). Catechin + idarubicin- and vitamin E + idarubicin-treated groups exhibited similar alterations, but changes were attenuated in comparison to...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Idarubicin; Catechin; Vitamin E; Cardiotoxicity; Ultrastructure.
Ano: 2002
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002001100017

Studies on the intrinsic nervous system of the wild rodent Calomys callosus digestive tract. II: The submucous plexus
Provedor de dados: 56
Autores: Souza,N.B.; Liberti,E.A.; De-Souza,R.R.
The submucous plexus of the normal small and large intestine of Calomys callosus was studied by NADH and AChE histochemical techniques and by transmission and scanning electron microscopy. The plexus contains (mean ± SD) 7,488 ± 293 neurons/cm2 in the duodenum, 5,611 ± 836 in the jejunum, 2,741 ± 360 in the ileum, 3,067 ± 179 in the cecum, and 3,817 ± 256 in the proximal colon. No ganglia or nerve cell bodies were seen in the esophagus, stomach, distal colon or rectum. The neurons are pear-shaped with a round or oval nucleus and the neuronal cell profile areas were larger in the large intestine than in the small intestine. Most of the neurons display intense AChE activity in the cytoplasm. AChE-positive nerve fibers are present in a primary meshwork of...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Submucous plexus; Wild mouse; Morphometry; Histochemistry; Ultrastructure; Calomys callosus.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000500007

Phytohemagglutinin improves the development and ultrastructure of in vitro-cultured goat (Capra hircus) preantral follicles
Provedor de dados: 56
Autores: Cunha,E.V.; Costa,J.J.N.; Rossi,R.O.D.S.; Silva,A.W.B.; Passos,J.R.S.; Portela,A.M.L.R.; Pereira,D.C.S.T.; Donato,M.A.M.; Campello,C.C.; Saraiva,M.V.A.; Peixoto,C.A.; Silva,J.R.V.; Santos,R.P.
The objective this study was to determine the effect of phytohemagglutinin (PHA) on survival, growth and gene expression in caprine secondary follicles culturedin vitro. Secondary follicles (∼0.2 mm) were isolated from the cortex of caprine ovaries and cultured individually for 6 days in α-MEM+ supplemented with PHA (0, 1, 10, 50, 100, or 200 µg/mL). After 6 days of culture, follicle diameter and survival, antrum formation, ultrastructure and expression of mRNA for FSH receptors (FSH-R), proliferating cell nuclear antigen (PCNA), and neuronal nitric oxide synthase were determined. All treatments maintained follicular survival [α-MEM+ (94.59%); 1 µg/mL PHA (96.43%); 10 µg/mL PHA (84.85%); 50 µg/mL PHA (85.29%); 100 µg/mL PHA (88.57%), and 200 µg/mL PHA...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Caprine; Antrum formation; FSH-R; PCNA; Ultrastructure.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2013000300245

Complementarity of radioautographic and immunohistochemical techniques for localizing neuroreceptors at the light and electron microscopy level
Provedor de dados: 56
Autores: Beaudet,A.
To assess relationships between neuropeptide-binding sites and receptor proteins in rat brain, the distribution of radioautographically labeled somatostatin and neurotensin-binding sites was compared to that of immunolabeled sst2A and NTRH receptor subtypes, respectively. By light microscopy, immunoreactive sst2A receptors were either confined to neuronal perikarya and dendrites or diffusely distributed in tissue. By electron microscopy, areas expressing somatodendritic sst2A receptors displayed only low proportions of membrane-associated, as compared to intracellular, receptors. Conversely, regions displaying diffuse sst2A labeling exhibited higher proportions of membrane-associated than intracellular receptors. Furthermore, the former showed only low...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Neurotensin; Somatostatin; Internalization; Neuropeptides; Autoradiography; Ultrastructure.
Ano: 1998
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X1998000200005

Membrane permeabilization of colistin toward pan-drug resistant Gram-negative isolates
Provedor de dados: 58
Autores: Mohamed,Yasmine Fathy; Abou-Shleib,Hamida Moustafa; Khalil,Amal Mohamed; El-Guink,Nadia Mohamed; El-Nakeeb,Moustafa Ahmed.
Abstract Pan-drug resistant Gram-negative bacteria, being resistant to most available antibiotics, represent a huge threat to the medical community. Colistin is considered the last therapeutic option for patients in hospital settings. Thus, we were concerned in this study to demonstrate the membrane permeabilizing activity of colistin focusing on investigating its efficiency toward those pan-drug resistant isolates which represent a critical situation. We determined the killing dynamics of colistin against pan-drug resistant isolates. The permeability alteration was confirmed by different techniques as: leakage, electron microscopy and construction of an artificial membrane model; liposomes. Moreover, selectivity of colistin against microbial cells was...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Pan-drug resistant; Leakage; Permeability alteration; Colistin; Ultrastructure.
Ano: 2016
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822016000200381

Candida albicans morphologies revealed by scanning electron microscopy analysis
Provedor de dados: 58
Autores: Staniszewska,M.; Bondaryk,M.; Swoboda-Kopec,E.; Siennicka,K.; Sygitowicz,G.; Kurzatkowski,W.
Scanning electron microscope (SEM) observations were used to analyze particular morphologies of Candida albicans clinical isolate (strain 82) and mutants defective in hyphae-promoting genes EFG1 (strain HLC52) and/ or CPH1 (strains HLC54 and Can16). Transcription factors Efg1 and Cph1 play role in regulating filamentation and adhesion of C. albicans' morphologies. Comparative analysis of such mutants and clinical isolate showed that Efg1 is required for human serum-induced cell growth and morphological switching. In the study, distinct differences between ultrastructural patterns of clinical strain's and null mutants' morphologies were observed (spherical vs tube-like blastoconidia, or solid and fragile constricted septa vs only the latter observed in...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Candida albicans; Pleomorphism; Ultrastructure; Virulence.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1517-83822013000300023

Effect of Phytoaccumulation of Arsenic and Chromium on Structural and Ultrastructural Changes of Brake Fern (Pteris vittata)
Provedor de dados: 61
Autores: Sridhar,Balaji B. Maruthi; Han,Fengxiang X.; Diehl,Susan V.; Monts,David L.; Su,Yi.
Structural and ultrastructural changes caused by bioaccumulation of As and Cr in brake fern (Pteris vittata), a known arsenic hyperaccumulator, were investigated. Potted plants of brake fern were exposed to metal treatments of As and Cr for three weeks. Leaf, stem and root samples were collected periodically and fixed for LM (Light Microscopy), SEM (Scanning Electron Microscopy) and TEM (Transmission Electron Microscopy) to evaluate anatomical changes. The fresh weights, dry weights, RWC (Relative Water Content) and plant heights were obtained before the brake fern plants were harvested for metal accumulation analysis. The As accumulated mainly in the shoots while Cr accumulated mainly in the roots of the metal-treated plants. Significant changes in the...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Anatomy; Arsenic; Chromium; Hyperaccumulator; Microscopy; Phytoremediation; Pteris vittata; Translocation; Ultrastructure.
Ano: 2011
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1677-04202011000400006