Revista brasileira de biologia最新文献

Scaling between cell cycle duration and wing growth is regulated by Fat-Dachsous signaling in Drosophila. 果蝇细胞周期持续时间与翅膀生长之间的比例受脂肪-达克斯信号调节。

Revista brasileira de biologia Pub Date : 2024-04-12 DOI: 10.1101/2023.08.01.551465

Andrew Liu, Jessica O'Connell, Farley Wall, Richard W Carthew

引用次数: 0

Influence of the pineal gland on the physiology, morphometry and morphology of pancreatic islets in rats 松果体对大鼠胰岛生理、形态及形态学的影响

Revista brasileira de biologia Pub Date : 2001-05-01 DOI: 10.1590/S0034-71082001000200018

L. M. B. Lima, L. Reis, M. A. D. Lima

{"title":"Influence of the pineal gland on the physiology, morphometry and morphology of pancreatic islets in rats","authors":"L. M. B. Lima, L. Reis, M. A. D. Lima","doi":"10.1590/S0034-71082001000200018","DOIUrl":"https://doi.org/10.1590/S0034-71082001000200018","url":null,"abstract":"To investigate the influence of the pineal gland through melatonin secretion on the physiological and morphological parameters of pancreatic islets, we studied the plasma biochemistry and morphological and morphometric characteristics of the endocrine pancreas of male Wistar rats. The animals were distributed into five groups of ten rats each: NC - normal control group; NS - sham-operated group; Px (25) - pinealectomised group, studied 15-25 days after surgery; Px (70) - pinealectomised group, studied 60-70 days after surgery; ALX - alloxan monohydrate-treated group. Data are analyzed statistically by ANOVA and by the Kruskal-Wallis test. Although there was no significant difference in plasma glucose or insulin levels between the Px (25), Px (70) and NC groups, Px (25) animals showed a tendency to increased glucose and reduced insulin levels. The ALX group showed a clear elevation of plasma glucose and a reduction of plasma insulin compared to the other groups. Morphometric analysis showed a larger pancreatic islet area and a lower pancreatic islet density in the pancreas of Px (70) animals and an increase in degenerative pathological processes in the pancreatic islets of the Px (25) and ALX groups. The present results suggest that melatonin, in addition to acting on tissue sensitivity to insulin (as reported in other studies), affects the secretory action of beta cells, as demonstrated by the morphological and morphometric changes observed in pinealectomised animals.","PeriodicalId":76429,"journal":{"name":"Revista brasileira de biologia","volume":"61 1","pages":"333-340"},"PeriodicalIF":0.0,"publicationDate":"2001-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0034-71082001000200018","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67178073","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 14

Dissolved inorganic carbon and metabolism of an eutrophic lacustrine system: variations from a 36-hours study 富营养化湖泊系统的溶解无机碳和代谢:36小时研究的变化

Revista brasileira de biologia Pub Date : 2000-11-01 DOI: 10.1590/S0034-71082000000400010

P. Pedrosa, C. Rezende

{"title":"Dissolved inorganic carbon and metabolism of an eutrophic lacustrine system: variations from a 36-hours study","authors":"P. Pedrosa, C. Rezende","doi":"10.1590/S0034-71082000000400010","DOIUrl":"https://doi.org/10.1590/S0034-71082000000400010","url":null,"abstract":"Este artigo fornece estimativas de produtividade primaria e mineralizacao liquidas ¾ metabolismo liquido do carbono ¾ ocorrentes na Lagoa de Cima (Estado do Rio de Janeiro), em funcao das variacoes das concentracoes de carbono inorgânico dissolvido (CID) no meio pelagico. As concentracoes de CID abrangeram o intervalo entre 203 e 773 µmol L-1 e o %CO2(aq) (saturacao) entre 339 e 4.901. O metabolismo liquido do carbono por periodo individual (claro/escuro) variou entre -556 e 503 mmol DIC m-2 12 h-1 no intervalo de 36 horas de estudo. Tambem foram observadas variacoes acentuadas no metabolismo liquido do carbono para ciclos de 24 horas. Os valores estenderam-se entre -25 e -194 mmol DIC m-2 day-1. Os resultados sao discutidos como indicadores de um comportamento biologico dinâmico direcionado a producao ou mineralizacao da materia orgânica no sistema. E o sistema pareceu deslocar-se de uma funcao heterotrofica para autotrofica. Em adicao, orientados pelos resultados obtidos, enfatizamos a importância axial da estrategia de amostragem e do tratamento cientifico de dados obtidos para a caracterizacao/interpretacao do metabolismo de sistemas aquaticos.","PeriodicalId":76429,"journal":{"name":"Revista brasileira de biologia","volume":"60 1","pages":"607-614"},"PeriodicalIF":0.0,"publicationDate":"2000-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0034-71082000000400010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67177963","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Hidrogeochemical comparative study of the Ja and Jacar-Guau River watersheds, So Paulo, Brazil 巴西圣保罗Ja河与Jacar-Guau河流域水文地球化学比较研究

Revista brasileira de biologia Pub Date : 2000-11-01 DOI: 10.1590/S0034-71082000000400004

Á. Souza, J. Tundisi

引用次数: 15

Insect mortality in Spathodea campanulata Beauv. (Bignoniaceae) flowers. Spathodea bell Beauv的交叉死亡率。(Bignoniaceae)弗劳尔。

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300019

José Roberto Trigo, José Roberto Trigo, W. F. D. Santos

引用次数: 37

Feeding biology of a guild of benthivorous fishes in a sandy shore on south-eastern Brazilian coast. 巴西东南海岸沙滩上一群食性鱼类的摄食生物学。

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300016

P. Zahorcsak, Renato Azevedo Matias Silvano, I. Sazima

{"title":"Feeding biology of a guild of benthivorous fishes in a sandy shore on south-eastern Brazilian coast.","authors":"P. Zahorcsak, Renato Azevedo Matias Silvano, I. Sazima","doi":"10.1590/S0034-71082000000300016","DOIUrl":"https://doi.org/10.1590/S0034-71082000000300016","url":null,"abstract":"The feeding biology of eight species of benthivorous fishes was studied in a sandy shore at Anchieta Island, south-eastern Brazilian coast. The fishes fed mainly on Amphipoda and Mysidacea crustaceans. The diet of the most abundant species, the drum Umbrina coroides, was analyzed in three standard length classes (20-55, 56-90 and 91-135 mm). This sciaenid showed an ontogenetic diet shift from Mysidacea to Amphipoda. The feeding behaviour of the sciaenid U. coroides and the gerreid Eucinostomus gula was recorded while snorkeling. During their foraging both species uncovered small organisms buried in the sand. Notwithstanding general similarities in diet, U. coroides and E. gula presented differences in feeding behaviour and morphology. Two carangid species of the genus Trachinotus differed in diet composition and consumed a larger array of food items than the remaining fish species. Differences in diet and feeding activity between the remaining benthivorous species were noted. These differences possibly reduce overlap in resource use and favour the coexistence of guilds of benthivorous fishes on sandy shores.","PeriodicalId":76429,"journal":{"name":"Revista brasileira de biologia","volume":"60 3 1","pages":"511-8"},"PeriodicalIF":0.0,"publicationDate":"2000-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0034-71082000000300016","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67177470","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 58

Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns. 中华绒猴的自然历史，1891(蜘蛛目，绒猴科)I:生境和色纹发展的观察。

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300015

C. E. Almeida, E. F. Ramos, E. Gouvêa, M. do Carmo-Silva, J. Costa

{"title":"Natural history of Ctenus medius Keyserling, 1891 (Araneae, Ctenidae) I: observations on habitats and the development of chromatic patterns.","authors":"C. E. Almeida, E. F. Ramos, E. Gouvêa, M. do Carmo-Silva, J. Costa","doi":"10.1590/S0034-71082000000300015","DOIUrl":"https://doi.org/10.1590/S0034-71082000000300015","url":null,"abstract":"Ctenus medius Keyserling, 1891 is a common species in several spots of Mata Atlântica, however there is a great lack of studies in all aspects of its natural history. This work aims to elucidate aspects of ecotope preference compared to large spiders, and to provide data on the development of chromatic patterns during its life cycle. The observations on the behavior of C. medius were done in the campus of Centro Universitário de Barra Mansa (UBM) by means of observations and nocturnal collections using cap lamps. For observations on the development of chromatic patterns, spiderlings raised in laboratory, hatched from an oviposition of a female from campus of UBM, and others spiderlings collected in field were used. The field observations indicate that: C. medius seems to prefer ecotopes characterized by dense shrub vegetation or herbal undergrowth; Lycosa erythrognatha and L. nordeskioldii seems to prefer open sites; Phoneutria nigriventer seems to prefer shrub vegetation and anthropogenic ecotopes as rubbish hills; Ancylometes sp. seems to prefer ecotopes near streams. Concerning chromatic patterns, it was observed that males and females show well distinct patterns during the last two instars, allowing distinction by sex without the use of a microscope. Through chromatic patterns it was also possible to draw a distinction between C. medius and C. ornatus longer that 3 mm cephalothorax width. 69 specimens of C. medius (males and females) collected in the campus of UBM did not show a striking polymorphism in chromatic pattern, but one among 7 adult females collected in National Park of Itatiaia, showed a distinct chromatic pattern.","PeriodicalId":76429,"journal":{"name":"Revista brasileira de biologia","volume":"60 3 1","pages":"503-9"},"PeriodicalIF":0.0,"publicationDate":"2000-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0034-71082000000300015","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67177407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 13

Improvement of silver impregnation technique (Protargol) to obtain morphological features of protists ciliates, flagellates and opalinates 银浸渍技术(Protargol)的改进，获得原生生物纤毛虫、鞭毛虫和蛋白石的形态特征

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300010

I. D. Silva-Neto

{"title":"Improvement of silver impregnation technique (Protargol) to obtain morphological features of protists ciliates, flagellates and opalinates","authors":"I. D. Silva-Neto","doi":"10.1590/S0034-71082000000300010","DOIUrl":"https://doi.org/10.1590/S0034-71082000000300010","url":null,"abstract":"The research on ciliates, flagelates and opalinates have been widespread by the utilization of techniques employing silver impregnation (Protargol), modified by several authors. However, these are time consuming and its results are variable. The present work is a variant of the technique described by Tuffrau (1964, 1967) showing some adaptations made in our laboratory. The organisms can be preserved by different fixatives (alcoholic Bouin, Stieve's fluid, 2.5% glutaraldehyde and others) and then rinsed in destilled water followed by a fast clarification by 3% sodium hypochloride. If the organism is very sensitive to hypochloride, 4% sodium lauryl sulfate may be used and then washed 3 times in distilled water. The protista can be adhered to the glass slides with Mayer's glycerinated-albumin (1 glycerin vol. to 1 or 2 albumin vol.), diluted in water at a proportion of 1:10 Cv/v., or with 1% polylysine followed by fast washes with distilled water. After the slide preparation, they were covered with a layer of 0,8% Silver proteinate. Right after that, the slide has to be placed in a glass tray lined with moist tissue and covered to prevent the proteinate to dry. The tray was placed in a incubator at 40o-50oC for 30 minutes. The slides are rinsed for 1 minute. with warm (35oC) distilled water. The development of the material should be done with 0.4% hydroquinone with a maximum incubation time of 1 minute. It should be developed gradually, controlling the silver impregnation intensity by observation under optical microscope. Next, rinse in distilled water for 1 minute, and then, fix in 2,5% Sodium thiosulfate. Rinse the slide for two minutes before dehydrating it in an alcoholic serial 50-100o. Finally rinse the slides in xylene. Mount the slides with Entellan MerckTM or Canada balsam.","PeriodicalId":76429,"journal":{"name":"Revista brasileira de biologia","volume":"60 1","pages":"451-459"},"PeriodicalIF":0.0,"publicationDate":"2000-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1590/S0034-71082000000300010","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"67177437","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 8

Raptors and "campo-cerrado" bird mixed flock LED BY Cypsnagra hirundinacea (Emberizidae:Thraupinae). 猛禽和“campo-cerrado”鸟类混合群，以飞禽科(飞禽科)为首。

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300011

J. Ragusa-Netto

引用次数: 20

Biological observations on Tupiperla (Plecoptera: Gripopterygidae). 钩翅目:钩翅蝇科的生物学观察。

Revista brasileira de biologia Pub Date : 2000-08-01 DOI: 10.1590/S0034-71082000000300009

C. Froehlich

引用次数: 3