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Registros recuperados: 11
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A new araucarian fossil species from the Paleogene of southern Argentina Ameghiniana
Panti,Carolina; Césari,Silvia N.; Marenssi,Sergio A.; Olivero,Eduardo B..
A new Araucariaceaea from the Paleogene of Tierra del Fuego Province, Argentina is described. Araucaria pararaucana sp. nov. has imbricate, ovate-lanceolate leaves with an acute apex, characterized by the presence of discontinuous and longitudinally oriented stomatal rows separated by epidermal cells, which may be slightly sinuous. Stomatal guard cell surface is granular. These fossil leaves are compared with the extant sections Bunya, Intermedia and Araucaria. Their anatomical characters along with the external morphology suggest a close affinity with the extant southern Patagonian species A. araucana (Molina) K. Koch. The record of this new late Eocene species provides more evidence for a probable unique representation of Section Araucaria in the area...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Gymnosperms; Araucariaceae; Araucaria; Cuticle; Paleogene; Argentina.
Ano: 2007 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0002-70142007000100016
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Cuticle microstructure as a new tool in systematic paleontology Naturalis
Waugh, David A.; Feldmann, Rodney M..
Fossil decapod cuticle has received little systematic study. The purpose of the present note is to survey the cuticle architecture of eleven extant decapod crabs arrayed within ten families, and to develop a classification scheme of cuticle types suitable for describing fossil and Recent decapod cuticle morphology.
Tipo: Article / Letter to the editor Palavras-chave: Decapoda; Cuticle; Microstructure; Systematic paleontology.
Ano: 2003 URL: http://www.repository.naturalis.nl/record/534333
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EFFECT OF THURINGIENSIN ON CUTICLE DEVELOPMENT OF IMMATURE STAGES OF Tetranychus urticae Koch. (ACARINA: TETRANYCHIDAE) Agricultura Técnica
Vargas,Robinson; Chapman,Bruce; Penman,David R..
The effect of thuringiensin on the ultrastructure of Tetranychus urticae Koch cuticle was studied using an transmission electron microscope (TEM). Thuringiensin was found to affect epicuticle synthesis in larvae, protonymphs and deutonymphs. Its disruptive effects on larval cuticle formation were observed from 12 h onwards, indicating that the effect of the exposure time of mites to thuringiensin is related to the stage of cuticle development. The results suggest that the effects of thuringiensin occur in a relatively short time.
Tipo: Journal article Palavras-chave: Thuringiensin; B -exotoxin; Cuticle; Thuringiensin; B -exotoxin.
Ano: 2002 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0365-28072002000200003
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Expression profile of a Laccase2 encoding gene during the metamorphic molt in Apis mellifera (Hymenoptera,Apidae) Rev. Bras. entomol.
Elias-Neto,Moysés; Soares,Michelle P.M.; Bitondi,Márcia M. G..
Expression profile of a Laccase2 encoding gene during the metamorphic molt in Apis mellifera (Hymenoptera, Apidae). Metamorphosis in holometabolous insects occurs through two subsequent molting cycles: pupation (metamorphic molt) and adult differentiation (imaginal molt). The imaginal molt in Apis mellifera L. was recently investigated in both histological and physiological-molecular approaches. Although the metamorphic molt in this model bee is extremely important to development, it is not well-known yet. In the current study we used this stage as an ontogenetic scenario to investigate the transcriptional profile of the gene Amlac2, which encodes a laccase with an essential role in cuticle differentiation. Amlac2 expression in epidermis was contrasted...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Apolysis; Cuticle; Ecdysteroids; Honey bee; Pupation.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0085-56262013000200012
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Handling sticky Resin by Stingless Bees: Adhesive Properties of Surface Structures Anais da ABC (AABC)
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
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Herbicide effects on cuticle ultrastructure in Eleusine indica and Portulaca oleracea Biocell
Malpassi,Rosana N..
Eleusine indica and Portulaca oleracea are two common weeds in peanut crops in southern Córdoba. Two chemicals are frequently used to control them, quizalofop for grasses and lactofen for dicots. The objective is to study the effects of quizalofop and lactofen on cuticle ultrastructure in E. indica and P. oleracea, respectively. In the lab, quizalofop was applied on E. indica and lactofen on P. oleracea. Three plant categories were analyzed in each species: 3, 1-2, and no tiller in E. indica, and 8, 6, and 2 nomophylls in P. oleracea. Leaf samples from both species were collected at 7 and 16 days post-application and were treated for scanning electron microscopy. E. indica cuticle treated with lethal dose shows areas where epicuticular waxes disappear,...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Quizalofop; Lactofen; Cuticle; E. indica; P. oleracea.
Ano: 2006 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S0327-95452006000100008
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Moulting in the chalimus larva of the salmon louse Lepeophtheirus salmonis (Copepoda, Caligidae) Naturalis
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
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Peculiar anatomical traits, high durability, and potential ornamental use of Cyclanthaceae as fresh foliage Anais da ABC (AABC)
MEDINA,MARIA CAMILA; HOYOS-GÓMEZ,SAÚL E.; DEMARCO,DIEGO; TUBERQUIA,DINO.
ABSTRACT Wild plant species with potential for use as ornamental green foliage are often reported. Nevertheless, there are few studies evaluating morphological and anatomical aspects associated with this use. Preliminary trials suggest that the species of Sphaeradenia (Sander ex Mast.) Harling, a Cyclantaceae that occurs from Costa Rica to Peru, is suitable to be used as fresh foliage because of attractiveness of their leaves in vase and its durability without showing tissue damage, compared with other genera of this family. Through the study of anatomical characters, it is possible to predict the potential of a species that can serve as ornamental foliage. In this study, three foliar anatomical features (thickness of the cuticle and leaf, and percentage...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Anatomy; Cuticle; Fibers; Mesophyll; Sphaeradenia laucheana.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652017000502399
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Sustainable Management of Keratin Waste Biomass: Applications and Future Perspectives BABT
Sharma,Swati; Gupta,Arun.
Keratin is a durable, fibrous protein which is mainly present in higher vertebrates (mammals, birds and reptiles) and humans epithelial cells. Food industry especially the meat market, slaughter house and wool industry produces million of tons of keratin containing biomass. These industries are constantly growing and the major producers include USA, Brazil and China, account for more than 40 million tons per year. These proteins constitute keratin by-products have from 15 to 18% nitrogen, 2-5% sulphur, 3.20% mineral elements and 1.27% fat and 90% of proteins. The organic waste rich in keratin can be utilized as a natural source using chemical and mechanical methods. The natural keratin obtained by biomass does not contain any harmful chemical and can be...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Keratin; Purification; Cosmetics; Cuticle; Coatings; Hygroscopic; Industrial applications.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132016000100701
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Thricology for identifying mammal species and breeds: its use in research and agriculture. Repositório Alice
FELIX, G. A.; PIOVEZAN, U.; QUADROS, J.; JULIANO, R. S.; ALVES, F. V.; FIORAVANTI, M. C. S..
The microscopic structure of animal hair is species-specific. This allows not only the identification of species but also discrimination among breeds. Trichology is widely used for species identification in taxonomy, ecology, paleontology, archaeology and even forensic sciences and food quality control. However, its use in livestock production is still incipient. Getting to know this methodology and to disseminate this technique in livestock investigation opens perspectives for research concerning animal genetic resources (AnGR s). Many advantages are listed such as the facility of sampling and processing, a great reliability of the results and a low cost. Therefore, trichology is an important tool for local breed studies in Brazil considering that...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Cuticle; Medulla; Morphometry; Hair; Cuticula; Medula; Morfometria; Pelos.
Ano: 2014 URL: http://www.alice.cnptia.embrapa.br/handle/doc/998134
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Ultrastructure of the cuticle of the chalimus larva of the salmon louse Lepeophtheirus salmonis (Krøyer, 1837) (Copepoda: Caligidae) Naturalis
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
Registros recuperados: 11
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