Presença de material eletrodenso sob a membrana vitelina do ovo de Scaptotrigona postica latr. (Hymenoptera, Meliponinae) durante a fase inicial da embriogenese

The present paper reports the presence of an electrondense material of unknown nature distributed under the viteline membrane of Scaptotrigona postica egg. The dorsal side layer is thicker then the ventral one. In eggs newly oviposited the material is gradually distributed inside the plasmalema invaginations. Later on (12 hs after oviposition) when a blastoderm is already formed around the egg, the material moves to the intercellular space. on the sequence of the development there was no more indication of the material under the membrane.

Transplante de membrana amniótica canina criopreservada para cicatrização de córnea com deficiência de células límbicas em coelhos

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Avaliação do emprego dos adsorventes: carvão ativo, chromosorb W e membrana C18 na preparação de amostras de ar para a determinação de d-aletrina em ambientes fechados

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Imunodifusão em gel de ágar com polissacarídeos de membrana de Brucella abortus 1119-3 no diagnóstico da brucelose bovina

Comparou-se a prova de imunodifusão em gel de ágar (IDGA), utilizando extrato polissacarídico (POLI O), obtido da amostra de B. abortus 1119-3, com os testes de soroaglutinação rápida em placa, de soroaglutinação lenta em tubos, de antígeno acidificado e de 2-mercaptoetanol para o diagnóstico da brucelose bovina. O IDGA mostrou alta especificidade, porém sensibilidade inferior aos métodos convencionais.

Aspectos clínicos e imunopatológicos da ceratoplastia com membrana amniótica xenógena fresca e conservada em glicerina: estudo experimental em coelhos

Avaliaram-se, por meio da análise clínica, histopatologia e imunoistoquímica, os efeitos da aplicação da membrana amniótica xenógena fresca e conservada em glicerina, sobre os mecanismos imunológicos da superfície ocular. Para tal, utilizaram-se 40 coelhos, distribuídos em dois grupos experimentais, os quais foram avaliados por 21 dias. A avaliação clínica revelou que a membrana amniótica xenógena conservada em glicerina estimulou uma resposta inflamatória aguda maior que a membrana aplicada fresca. A análise histopatológica indicou que ambas se comportaram de forma semelhante a partir da primeira semana de pós-operatório, apresentando as alterações clássicas da resposta inflamatória da córnea, com o predomínio de infiltrado do tipo polimorfonuclear. A análise imunoistoquímica indicou que, ainda aos 21 dias, a resposta imune local é inespecífica, permitindo concluir que a resposta imune específica na córnea é tardia e que a córnea é um sítio privilegiado para aplicação de enxertos com características imunológicas diferentes, visto que não houve o estímulo para o desenvolvimento de uma resposta mais específica nos grupos avaliados durante toda a execução do experimento.

Análise histológica e morfométrica da área cruenta tratada com membrana de silicone: estudo em ratos

Background. Thin study evaluated the effects of a silicone membrane on the treatment of the raw flesh area in wounds.METHODS. The experimental study was carried out with 30 male Wistar rats divided into three groups: in the G(G) group, the raw area was treated with gauze, in the G(H) group with homograft, and in the G(S) group with a silicone membrane. Animals were sacrificed at fourteen days of postoperative. The studied attributes were body mass variation, histological study quantifed by morphometric analysis evaluating the number of neovessels, fibroblasts, collagen fibers, leucocytes, monocytes; and using a micrometric ruler measurement of the raw area thickness. Data were then submitted to statistical analysis.RESULTS. There was no significant difference between the animals' mass (p=0.0685). Predominance of neovessels (p<0.01), fibroblasts (p<0.001) and thickness of the raw flesh were observed in G(S) animals. There was predominance of leucocytes (p<0.021) and monocytes (p<0.0001) in G(H) animals. Also, no significant difference between the groups as for collagen fibers (p=0.0536) was observed.CONCLUSION. The silicone membrane promoted granulation tissue with a large number of neovessels, fibroblasts and greater thickness.

Avaliação das Sub-Frações dos Carboidratos e das Proteinas, Usando as Metodologias do Cncps e In situ com Bovinos da Raça Nelore. 1. Silagem de Milho

To validate the use of the Cornell Net Carbohydrate and Protein System (CNCPS) under Brazilian conditions, the chemical composition, the potential and the effective degradabilities of the carbohydrate and protein subfractions, and the solid phase passage rate were determined for corn silage in diets with forage:concentrate ratios of 80:20 (DI) and 60:40 (D2) using Nellore cattle. The chromium mordant technique was used to determine the particulate passage rate of solids. For diet 2, there was a reduction in the potentially degradable dry matter (DM), and however not significant, a reduction in the degradation rates of neutral detergent Fiber (NDF, 49%) and neutral detergent insoluble nitrogen (NDIN, 32%), and an increase in the degradation rare of starch (ST, 25%). The use of lag time increased the effective DM degradation (EDDM) of corn silage in both diets (23% and 53% for D1 and D2, respectively). The concentrate ratios did not influence the particulate passage rate of the diets. The higher values related ro the availability of the protein subfractions may indicate a underestimation by CNCPS, Rnd(or) could be attributed to the Zebu animals used in this study.

Aspectos estruturais da membrana eritrocitária

This article describes the structures and functions of the erythrocyte membrane and its importance in transfusional medicine. The erythrocyte membrane is one of the best known membranes in terms of structure, function and genetic disorders. As any other plasma membrane, it mediates transport functions. It also provides the erythrocytes with their resilience and deformability. According to the International Society of Blood Transfusion (ISBT), more than 500 antigens are expressed in the erythrocyte membrane, and around 270 are involved in transfusion reaction cases and hemolytic diseases of the fetus and newborn. In the ISBT classification, the high frequency series is represented by antigens in more than 99% of population (high prevalence antigen). In transfusion, the absence of these antigens determines severe problems as for example, one woman without the P antigen suffered 6 repetitive miscarriages due to placental insufficiency, which was caused by an antibody formed against the absent P antigen. Some important erythrocyte membrane proteins are described here including Band 3, Glycophorins and spectrin. The most abundant integral membrane protein is Band 3 and its main function is to mediate exchange of chloride and bicarbonate anions across the plasma membrane. The second most abundant integral membrane protein in the human erythrocyte is sialoglycoprotein glycophorin A (GPA). With its high sialic acid content, GPA is the main contributor to the net negative cell-surface charge and is thus critical for minimizing cell-cell interactions and preventing red cell aggregation. Glycophorin C (GPC) is the receptor for PfEBP-2 (baebl, EBA-140), the newly identified erythrocyte binding ligand of Plasmodium falciparum. The ternary complex of spectrin, actin and 4.1R defines the nodes of the erythrocyte membrane skeletal network, and is inseparable from membrane stability when under mechanical stress. This erythrocyte membrane review is important for a better understanding of transfusion reactions, where the antibody formation against high prevalence antigens makes compatible transfusions difficult. The study of antigen diversity and biochemical characterization of different proteins will contribute to healthcare, as well as diagnosis, development of technology such as monoclonal antibody production and the therapeutic conduct of many diseases.

Aspectos clínicos do enxerto conjuntival 360° e do implante da membrana amniótica criopreservada no tratamento de úlceras de córnea em cães

To evaluate the clinical application of implant of the canine cryopreserved amniotic membrane (DMEM plus DMSO 1:1) and 360° conjunctival flap in the treatment of progressive corneal ulceration. 10 dogs of the different breeds, males and females, aging four months to four years old with deep corneal ulceration and different clinical progression were divided in two groups: G1=360° conjunctival graft (n=5) and G2=implant of amniotic membrane, sutured at the edge of the ulcer with epithelial side facing up, associated with the third eyelid flap (n=5). The comparative analysis between groups was: complications, blepharospasm, ocular secretion, corneal vascularization, epithelial defect and corneal opacification in six moments (first emergency care, surgery and 3, 7, 15 and 30 days of postoperative). Without epithelial defect was evaluated quality of the scar. It was used score scale for subjective to qualify of the ocular signs. In G1, it was observed the non-adherence of the conjunctival graft to the ulcer (n=2), dehiscence of the suture (n=2), anterior synechia (n=2) and intense chemosis (n=1). In G2, it was not observed these complications. It was not significant difference between the groups to others ocular parameters, but it was different among the start and end moments of the same groups (ocular secretion, corneal vascularization, epithelial defect). The corneal opacity was more intense in G1. According to the clinical results, the cryopreserved amniotic membrane implant proved to be as effective in the corneal ulceration in comparison to the 360° conjunctival flap, because probably, the membrane promoted a trophic support for epithelialization, anti-inflamatory effect associated with important to the end result phenotype.

Análise histológica e morfométrica de área cruenta tratada com membrana de silicone: estudo em rato

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

Efeito das interações peptídeo-peptídeo e peptídeo-membrana nas atividades funcionais de toxinas peptídicas do veneno da vespa social Agelaia pallipes pallipes (Hymenoptera, Vespidae)

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)

Prospecção das interações mastoparano-membrana em proteolipossomos como modelo para o desenvolvimento racional de novos agentes antimicrobianos

Pós-graduação em Ciências Biológicas (Biologia Celular e Molecular) - IBRC

Proteção de bovinos contra Haemonchus placei e Haemonchus contortus após imunização com antígenos oriundos da membrana intestinal de H. contortus

Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)