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A study of autophagy in hemocytes of the Pacific oyster, Crassostrea gigas ArchiMer
Picot, Sandy; Morga, Benjamin; Faury, Nicole; Chollet, Bruno; Dégremont, Lionel; Travers, Marie-agnes; Renault, Tristan; Arzul, Isabelle.
Macroautophagy is a mechanism that is involved in various cellular processes, including cellular homeostasis and innate immunity. This pathway has been described in organisms ranging in complexity from yeasts to mammals, and recent results indicate that it occurs in the mantle of the Pacific oyster, Crassostrea gigas. However, the autophagy pathway has never been explored in the hemocytes of C. gigas, which are the main effectors of its immune system and thus play a key role in the defence of the Pacific oyster against pathogens. To investigate autophagy in oyster hemocytes, tools currently used to monitor this mechanism in mammals, including flow cytometry, fluorescent microscopy and transmission electron microscopy, were adapted and applied to the...
Tipo: Text Palavras-chave: Autophagosome; Autophagy; Crassostrea gigas; Flow cytometry; Fluorescence microscopy; Hemocytes; Transmission electron microscopy.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00487/59905/63087.pdf
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Anatomical and biochemical changes associated with the development and germination of Araucaria angustifolia seeds Biological Sciences
Shibata, Marília; Coelho, Cileide Maria Medeiros; Schmidt, Eder Carlos; Bouzon, Zenilda Laurita; Campos, José Marcello Salabert de; Maraschin, Marcelo.
This study aimed at assessing the cell cycle, and anatomical and biochemical changes that the embryonic axis of Araucaria angustifolia undergoes during development, focusing on the maturation stage. During all development, cells exhibited intense metabolic activity with an abundance of mitochondria, lipid bodies, and vacuolated cells. The continued accumulation of starch and protein was observed by LM and TEM and indicated by spectra of FTIR. Cell differentiation of the procambium was observed with a thickening of the cell wall and the formation of resiniferous ducts. At Stage III and IV, cells exhibited structural changes such as altered or elongated mitochondria and presence of plastoglobules. These results suggest that there is a gradual transition from...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0 Botânica; 2.03.03.00-9 Fisiologia Vegetal; 5.02.01.04-2 Sementes Florestais maturation; Recalcitrant seed; Light microscopy; Transmission electron microscopy; Flow cytometry Botânica.
Ano: 2019 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/43381
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Antifungal activity and ultrastructural alterations in Pseudocercospora griseola treated with essential oils Ciência e Agrotecnologia
Hoyos,Julián Mauricio Ágredo; Alves,Eduardo; Rozwalka,Luciane Cristina; Souza,Elaine Aparecida de; Zeviani,Walmes Marques.
Pseudocercospora griseola, the etiologic agent of angular leaf spot of common bean (Phaseolus vulgaris), is an important disease in all bean-producing regions worldwide and may cause extremely high yield losses. The control of this disease is made more difficult by the pathogen's genetic variability and the inefficiency of fungicides. In this study, of 26 essential oils tested at different concentrations, 25 demonstrated efficiency in affecting the germination of strains 63-31 and 63-63 of the pathogen, reaching inhibition levels of between 80% and 100%. Cymbopogon citratus and Cymbopogon martinii inhibited conidia germination at all concentrations; Eugenia caryophyllata, Cinnamomum sp., Thymus vulgaris, Matricaria recutita, Cordia verbenacea, Origanum...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Angular leaf spot; Transmission electron microscopy; Alternative control of plant disease.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000300002
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Characterization of the protozoan parasite Marteilia refringens infecting the dwarf oyster Ostrea stentina in Tunisia ArchiMer
Elgharsalli, Refka; Aloui-bejaoui, Nejla; Sala, Hedi; Chollet, Bruno; Joly, Jean-pierre; Robert, Maeva; Couraleau, Yann; Arzul, Isabelle.
Marteilia refringens is a protozoan parasite recognized as a significant pathogen of the European flat oyster Ostrea edulis. The life cycle of this species is still poorly known, although there is evidence of the need for intermediate host(s). In the present study, we have used molecular approaches to identify this parasite in samples of the dwarf oyster Ostrea stentina after reports of massive mortality along the Tunisian coasts. In 2009 we evaluated the status of O. stentina from Monastir and checked if there was an infection with M. refringens, using polymerase chain reaction assays. Of the 103 tested O. stentina, 85 were PCRpositive using a Marteilia genus-specific assay. Additional assays were subsequently carried out on some samples collected in 2010...
Tipo: Text Palavras-chave: Marteilia refringens; Molecular diagnosis; IGS; ITS; Transmission electron microscopy; Ostrea stentina.
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00124/23538/21422.pdf
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Chloroplast ultrastructure and hormone endogenous levels are differently affected under light and dark conditions during in vitro culture of Guadua chacoensis (Rojas) Londoño & P. M. Peterson. Repositório Alice
POLESI, L. G.; FRAGA, H. P. F. de; VIEIRA, L. do N.; HERINGER, A. S.; ORNELLAS, T. S.; SANTOS, H. P. dos; GUERRA, M. P.; PESCADOR, R..
Abstract: Guadua chacoensis (Poaceae) is a woody bamboo native from the Atlantic forest biome. Morphogenetic and physiological studies are scarce in bamboos, and tissue culture-based biotechnologies tools can be used to investigate ultrastructure and physiological processes as well as to mass-propagate specific genotypes. This study evaluated the effect of light and dark conditions on chloroplast biogenesis as well as in the endogenous levels of zeatin (Z), abscisic acid (ABA), gibberellic acid (GA4), and jasmonic acid (JA) during in vitro culture of G. chacoensis. An increase was observed, followed by a decrease in starch content in response to light treatment, and in contrast, in darkness, an accumulation of starch which is associated to amyloplast...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Phytohormone; Guadua chacoensis (Poaceae); Woody bamboo native; Atlantic forest biome; Bamboos; Micropropagation; Transmission electron microscopy; Plant physiology.
Ano: 2019 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1103488
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Citrus sinensis leaf petiole and blade colonization by Xylella fastidiosa: details of xylem vessel occlusion Scientia Agricola
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
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Cryptosporidiosis and Isosporosis among AIDS Patients with Chronic Diarrhea in Thailand OAK
Wanachiwanawin, Darawan; Manatsathit, Sathaporn; Suwanagool, Parvinee; Tunsupasawasdikul, Somsith; Lertlaituan, Punpob; Thakerngpol, Kleophant.
Palavras-chave: Cryptosporidiosis; Isosporosis; AIDS patients; Chronic diarrhea; Transmission electron microscopy.
Ano: 1998 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/274
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Cytopathology of callus cells infected with grapevine leafroll-associated virus 3 Trop. Plant Pathol.
SCAGLIUSI,SANDRA M. M.; VEGA,JORGE; KUNIYUKI,HUGO.
The cytopathology of grapevine (Vitis spp.) callus tissue infected with Grapevine leafroll-associated virus 3 (GLRaV-3), genus Vitivirus was studied in order to investigate the usefulness of callus cultures to study grapevine leafroll-associated viruses. Ultrathin sections were made from in vitro callus obtained from stems and shoots of GLRaV-3 infected grapevine plants. Callus was composed of two types of tissue. Translucent, soft callus was formed and composed of large loosely arranged cells, containing big vacuoles and a thin layer of cytoplasm. Other parts of the callus were brown-coloured and composed of small compactly arranged cells, which showed flexuous and rod-shaped closterovirus-like particles, with 10-12 nm in diameter, at higher...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Closterovirus; Vitis spp.; Transmission electron microscopy.
Ano: 2002 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-41582002000400008
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Deformation of Mitochondrial Cristae in Human Neural Progenitor Cells Exposed to Valproic Acid Anais da ABC (AABC)
COSTA,RODRIGO M. DA; KARMIRIAN,KARINA; REHEN,STEVENS K..
ABSTRACT Neural development represents a dynamic process where mitochondrial integrity is decisive for neuronal activity. Structural changes in these organelles may be related to neurological disorders. Valproic acid (VPA) is an anticonvulsive drug commonly used for epilepsy treatment and its use is associated to increased risk of neuropsychiatric disorders. Recently we showed changes in shape and membrane potential in mitochondria from human neural progenitor cells (NPCs) exposed to VPA (da Costa et al. 2015). Here, we applied transmission electron microscopy and electron tomography to evaluate mitochondrial damage caused by VPA in NPCs. Results showed mitochondrial cristae disorganization in a dose dependent manner. Disturbance in mitochondrial...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Transmission electron microscopy; Mitochondria; Valproic acid; Epilepsy; Human neural progenitor cells; Electron tomography.
Ano: 2018 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652018000502223
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Detection of a mollicute-like organism in kuruma shrimp, Penaeus japonicus ArchiMer
Choi, Dong-lim; Park, Myoung-ae; Sohn, Sang-gyu; Heo, Moon-soo; Renault, Tristan.
A filamentous form of mollicute-like bacterium was detected during a routine health survey of wild adult kuruma shrimp Penaeus japonicus. The kuruma shrimp were native to Japan and were imported to Korea. The histology showed no pathological changes. Transmission electron microscopy revealed extensive infections of hepatopancreatic epithelial cells by a pleomorphic, filamentous intracellular bacterium. The filamentous bacterium was of about 60 nm in diameter and 300 nm to more than 1µm in length. The morphology of bacteria were filamentous and branched with terminal blebs, or knobs, on the branches. They lacked the cell wall, and were bounded by the plasma membrane. They contained typical prokaryotic ribosomes and fibrillar DNA-like strands. No additional...
Tipo: Text Palavras-chave: Transmission electron microscopy; Hepatopancreas; Mollicute; Intracellular bacteria; Penaeus japonicus.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/1996/publication-2901.pdf
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Detection of Coronavirus in Capybaras (Hydrochoeris hydrochaeris) by Transmission Electron Microscopy in São Paulo, Brazil International Journal of Morphology
Catroxo,M. H. B; Miranda,L.B; Lavorenti,A; Petrella,S; Melo,N. A; Martins,A. M. C. P. R. F.
Coronaviruses are enveloped, positive-stranded RNA, belongs to the Nidovirales order, Coronaviridae family and are classified into three groups. Groups 3a and 3c comprising the avian coronaviruses. They are worldwide in distribution and can cause respiratory, enteric and in some cases hepatitis and neurological diseases in a wide variety of animals, resulting in economic losses to breeders and breeding. In this study, we describe an outbreak of diarrhea in a herd of capybaras found in the city of Piracicaba, São Paulo, Brazil. The animals had sudden symptoms of anorexia, profuse and watery diarrhea, yellowish or greenish, dehydration, weight loss, sharp and twisting of limbs leading to death in less than a week, mostly weaned and with an age of three...
Tipo: Journal article Palavras-chave: Coronavirus; Capybaras; Transmission electron microscopy.
Ano: 2010 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000200035
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Ecophysiological, anatomical and ultrastructural characteristics of Vitex polygama Cham. (Verbenaceae) submitted to different concentrations of fluoride Biological Sciences
Rossi, Zélia Terezinha Teixeira; Castro, Evaristo Mauro de; Pereira, Giuslan Carvalho; Barbosa, João Paulo Rodrigues Alves Delfino; Carvalho, Graziele Wolff de Almeida; Rossi, Marco Aurélio de Lima Silva; Pereira, Fabrício José.
Fluorides released during the manufacture of aluminum, fertilizers, glass and ceramics are considered to be highly toxic to plants, causing damages in relatively small concentrations. This study aimed to evaluate fluoride (F) accumulation and its effects on Vitex polygama Cham. (Verbenaceae) exposed to simulated rain containing potassium fluoride in concentrations of 5, 10, 15 and 20 mg L-1. Vitex polygama presented no visual symptoms of foliar injury and accumulated a relatively small amount of F-, significant only for the treatments with higher concentrations of the pollutant.  F- promoted an increase in non-photochemical quenching (qN) and in the coefficient due to non-photochemical extinction (NPQ), which indicates higher dissipation of radiant energy...
Tipo: Info:eu-repo/semantics/article Palavras-chave: 2.03.00.00-0; 2.03.02.03-7; 2.03.03.00-9 chlorophyll a fluorescence; Potassium fluoride; Scanning electron microscopy; Transmission electron microscopy; Biomonitoring studies Botânica; Anatomia Vegetal; Fisiologia Vegetal.
Ano: 2016 URL: http://periodicos.uem.br/ojs/index.php/ActaSciBiolSci/article/view/31400
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Essential oils for rust control on coffee plants Ciência e Agrotecnologia
Pereira,Ricardo Borges; Lucas,Gilvaine Ciavareli; Perina,Fabiano José; Alves,Eduardo.
Rust is considered the most important disease in coffee because it causes severe defoliation in plants and, consequently, reduction in productivity. This study evaluated the in vitro effect of essential oils of cinnamon, citronella, lemongrass, clove, tea tree, thyme, neem and eucalyptus on the germination of urediniospores of Hemileia vastatrix; the effectiveness of these oils to control rust on seedlings of coffee cultivars Catucaí 2SL, Catuaí IAC 62 and Mundo Novo 379/19 in the greenhouse; and the effect of more promising oils on urediniospores of H. vastatrix by transmission electron microscopy (TEM). All the essential oils inhibited the germination of urediniospores with increasing concentrations. All oils promoted partial control of the disease in...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Hemileia vastatrix; Alternative control; Transmission electron microscopy.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-70542012000100002
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Fine structural analysis of the stinger in venom apparatus of the scorpion Euscorpius mingrelicus (Scorpiones: Euscorpiidae) J. Venom. Anim. Toxins incl. Trop. Dis.
Yigit,N; Benli,M.
In this study, the morphology, histology and fine structure of the stinger, a part of the venom apparatus of Euscorpius mingrelicus (Kessler, 1874) (Scorpiones: Euscorpiidae) were studied by light microscopy and transmission electron microscopy (TEM). The stinger, located at the end section of the telson, is sickle-shaped. The venom is ejected through a pair of venom pores on its subterminal portion. Both venom ducts extend along the stinger without contact with each other since they are separated by connective tissue cells. The stinger cuticle is composed of two layers. Additionally, there are many pore canals and some hemolymph vessels in the cuticle. This work constitutes the first histological and fine structure study on Euscorpius mingrelicus stinger.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Scorpion; Euscorpius mingrelicus; Telson; Stinger; Fine structure; Transmission electron microscopy.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1678-91992010000100008
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Herpesvirus infection in European flat oysters Ostrea edulis obtained from brood stocks of various geographic origins and grown in Galicia (NW Spain) ArchiMer
Da Silva, P; Renault, Tristan; Fuentes, J; Villalba, A.
We evaluated differences in productive traits and disease susceptibility among Ostrea edulis stocks. We produced 4 to 5 families from each of 4 oyster populations (Irish, Greek and 2 Galician) in a hatchery. Spat corresponding to 19 different families were transferred to a raft in the Ria de Arousa (Galicia, Spain) for grow-out. Samples of each family were histologically processed every month for 2 yr. One of the pathological conditions disclosed by histological examination was characterised by the occurrence of numerous abnormal cells throughout the connective tissue of various organs, showing hypertrophied nuclei with marginated chromatin and a characteristic large intranuclear acidophilic inclusion. Ultrastructural examination showed that the abnormal...
Tipo: Text Palavras-chave: In situ hybridisation; Transmission electron microscopy; Histology; Bonamiosis; Ostreid herspesvirus 1; Ostrea edulis.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3735.pdf
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Identification of Poxvirus Under Transmission Electron Microscopy During Outbreak Period in Wild Birds, in São Paulo, Brazil International Journal of Morphology
Catroxo,M. H. B; Pongiluppi,T; Melo,N. A; Milanelo,L; Petrella,S; Martins,A. M. C. P. F; Rebouças,M. M.
Avianpox is a highly contagious disease infecting both commercial and wild birds, causing great damages to breeders and breeding. Caused by DNA viruses of the family Poxviridae, genus Avipoxvirus, if manifest through 3 forms, cutaneous, diphtheric and septicemic. In June 2003, during illegal commercialization of Brazilian birds, 800 wild birds (Paroaria dominicana, Sporophila caerulescens and Sporophila albogularis) were apprehended and being forwarded to the CRAS (Wild Animals Recovery Center), Tietê Ecological Park. After one month, birds presented cutaneous lesions in the beak and feet and anorexia, emaciation, locomotion difficulties, diarrhea, dehydration and death. Among the 800 birds, 500 died and 40 these (15 Paroaria dominicana, 15 Sporophila...
Tipo: Journal article Palavras-chave: Poxvirus; Paroaria dominicana; Sporophila caerulescens; Sporophila albogularis; Transmission electron microscopy.
Ano: 2009 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022009000200043
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Induction and characterization of oil palm (Elaeis guineensis Jacq.) pro-embryogenic masses Anais da ABC (AABC)
PáDUA,MARLÚCIA S.; PAIVA,LUCIANO V.; LABORY,CLAÚDIA R.G.; ALVES,EDUARDO; STEIN,VANESSA C..
ABSTRACTOil palm is one of the most economically valuable oil seed plants, but the expansion of plantations has been limited by availability of seedlings, as the conventional propagation is through seeds, which have low germination rates. One possible solution for the large-scale production is the use of somatic embryogenesis. The aim of this study was evaluate the effects auxins 2,4-D and picloram on the induction of pro-embryogenic masses inE.guineenesis hybrid leaf explants and characterize, regarding embryogenic characteristics, with cytochemical and ultrastructural analisys. Specifically, in vitro plantlets leaves fragments were inoculated in Y3 culture medium supplemented by 2.4-D or picloram at different concentrations (0.0, 1.0, 3.0, 6.0 and 9.0 mg...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Embryogenic potential; Growth regulators; Tissue culture; Transmission electron microscopy.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652013000401545
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Morphological and ultrastructural analysis of various types of banana callus, cv. Prata anã - doi: 10.4025/actasciagron.v34i4.14501 Agronomy
Ribeiro, Luciene Oliveira; Universidade Federal de Lavras; Paiva, Luciano Vilela; Universidade Federal de Lavras; Pádua, Marlúcia Souza; Universidade Federal de Lavras; Santos, Breno Régis; Universidade Federal de Alfenas; Alves, Eduardo; Universidade Federal de Lavras; Stein, Vanessa Cristina; Universidade Federal de Goiás.
This work was carried out to characterise morphologically and ultrastructurally the banana callus, obtained from the scalp method. Genotypes of banana, cv. Prata anã, cultivated in vitro were used to induce meristems at the leaf base; subsequently, structures known as scalps were formed. For ultrastructural analysis, five samples of callus were collected, fixed in Karnovsky solution and analysed by scanning electron microscope (SEM) and transmission electron microscope (TEM). The formation of three types of callus was observed: Type 1 - transparent watery callus, Type 2 - yellow callus with small clusters, Type 3 - yellow callus with large clusters. SEM analysis showed that Type 1 callus cells were elongated and that Type 2 and Type 3 callus cells were...
Tipo: Laboratory analysis Palavras-chave: 5.01.00.00-9 Agronomia 5.01.00.00-9 scanning electron microscopy; Transmission electron microscopy; Musa sp.; Cytology; Embryogenesis Agronomia.
Ano: 2012 URL: http://periodicos.uem.br/ojs/index.php/ActaSciAgron/article/view/14501
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Morphological study of partridge Eimeria procera development in the foreign host - Leghorn chicks (Gallus gallus) OAK
Revajová, Viera; Loószová, Adriana; Goldová, Maria; Zibrín, Martin; Herich, Robert; Levkut, Mikulas.
In order to morphological study of non-specific host immune response, cross-species experimental infection of Leghorn chicks with partridge specific coccidium, Eimeria procera (106 oocyst/per birds) was done. Schizonts of E. procera were histologically observed in all the parts of small intestine and caeca of chicks. Heterophilic and lymphocytic infiltration in lamina propria, and damage of villi intestine were observed. Schizonts were studied by electron microscope after 12, 30, and 60 hours post-infection (h pi). Results demonstrated immature and structurally damaged schizonts at 12 h pi, delayed maturation of first generation schizonts at 30 h pi, and phagocytosis of parasites at 60 h pi by intraepithelial lymphocytes.
Palavras-chave: Eimeria procera; Transmission electron microscopy; Specific and non-specific host; Intraepithelial lymphocytes.
Ano: 2006 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/144
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Mucoadhesive microemulsion of ibuprofen: design and evaluation for brain targeting efficiency through intranasal route BJPS
Mandal,Surjyanarayan; Mandal,Snigdha Das; Chuttani,Krishna; Subudhi,Bharat Bhushan.
This study aimed at designing mucoadhesive microemulsion gel to enhance the brain uptake of Ibuprofen through intranasal route. Ibuprofen loaded mucoadhesive microemulsion (MMEI) was developed by incorporating polycarbophil as mucoadhesive polymer into Capmul MCM based optimal microemulsion (MEI) and was subjected to characterization, stability, mucoadhesion and naso-ciliotoxicity study. Brain uptake of ibuprofen via nasal route was studied by performing biodistribution study in Swiss albino rats. MEI was found to be transparent, stable and non ciliotoxic with 66.29 ± 4.15 nm, -20.9 ± 3.98 mV and 98.66 ± 1.01% as average globule size, zeta potential and drug content respectively. Transmission Electron Microscopy (TEM) study revealed the narrow globule size...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ibuprofen/brain-targeting; Ibuprofen/intranasal administration; Ibuprofen/mucoadhesion; Mucoadhesive microemulsion gel; Drugs/design; Transmission electron microscopy.
Ano: 2015 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502015000300721
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