Results: 262

Musk gland seasonal development and musk secretion are regulated by the testis in muskrat (Ondatra zibethicus)

Biol. Res; 50 (), 2017
BACKGROUND: The muskrat is a seasonal breeder. Males secrete musk to attract females during the breeding season. The testosterone binding to the androgen receptor (AR) in musk glands of muskrat may play an important role conducting the musk secretion process. METHODS: The musk gland, testis and blood sam...

Population structure and reproduction of a migratory fish Leporinus piau (Characiformes: Anostomidae) in a semiarid tropical reservoir, Brazil

Rev. biol. trop; 64 (4), 2016
Abstract:Migratory fishes have been seriously impacted by the building of reservoirs and because of the negative effects of these projects such as the interruption of migratory routes, reduction or elimination of spawning/ feeding areas, and initial development can influence the population structure the ...

Permanent germinal epithelium and reproductive cycle of Atractosteus tropicus (Lepisosteiformes: Lepisosteidae) males, Tabasco, Mexico

Rev. biol. trop; 64 (4), 2016
Abstract:The tropical gar A. tropicus plays an important ecological role as it regulates other fish stocks in different water bodies in Southeastern México. Nevertheless, wild populations are declining, and one conservation alternative is the aquaculture production and basic knowledge of reproductive bi...

Reproducción de Pomacea flagellata (Mollusca: Ampullariidae) en la laguna de Bacalar, Quintana Roo, México

Rev. biol. trop; 64 (4), 2016
Resumen:Pomacea flagellata es una especie de caracol de agua dulce nativo en el sureste de México. Sobre esta especie existen pocos estudios y en ninguno se han abordado aspectos de su reproducción. Este caracol ha sido explotado durante años en la laguna Bacalar y sus poblaciones han decrecido consid...

Interactions between prolactin and kisspeptin to control reproduction

ABSTRACT Prolactin is best known for its effects of stimulating mammary gland development and lactogenesis. However, prolactin is a pleiotropic hormone that is able to affect several physiological functions, including fertility. Prolactin receptors (PRLRs) are widely expressed in several tissues, includi...

Method of capture and population structure of Aegla georginae Santos and Jara, 2013 (Decapoda: Anomura: Aeglidae) in a tributary of the Ibicuí River in southern Brazil

Braz. j. biol; 76 (4), 2016
Abstract In the current study, we investigated population aspects of Aegla georginae in the Ibicuí River Basin by considering different capture methods and the implication of these data in the analysis of population dynamics. We sampled 1774 individuals: 1259 males (21 and 97 juveniles and 1029 and 113 ...

Phenology, reproductive biology and growing degree days of the grapevine ‘Isabel’ (Vitis labrusca, Vitaceae) cultivated in northeastern Brazil

Braz. j. biol; 76 (4), 2016
Abstract Phenology and reproductive biology of cultivated species are important for the comprehension of the requirements for fruit and seed production and the management of pollinators. This study aimed to characterise the phenology, reproductive biology and growing degree days of the grapevine ‘I...

Biological parameters and fertility life table of Aphis forbesi Weed, 1889 (Hemiptera: Aphididae) on strawberry

Braz. j. biol; 76 (4), 2016
Abstract This study provides the first contribution of the biology and life table of Aphis forbesi Weed, 1889 (Hemiptera: Aphididae), an important strawberry pest throughout the world. This species lives in the crown and leaf petioles of the plant. It is difficulty to rear this species in laboratory due ...

O exame médico pré-nupcial em debate: uma proposta de intervenção eugênica no Brasil, 1910-1940

Hist. ciênc. saúde-Manguinhos; 23 (supl.1), 2016
Resumo Este texto resulta da pesquisa que desenvolvo para minha dissertação de mestrado, cuja temática central é a proposta do exame médico pré-nupcial nas primeiras décadas do século XX no Brasil. Tal medida foi amplamente defendida por eugenistas brasileiros por ser considerada necessária e im...

Contraception and family planning at the extreme of reproductive life-climacteric

SUMMARY Menopause is an endocrine phenomenon characterized by gradual estrogen decline. This is a stage in a woman's life in which contraception is extremely important as the risks associated with pregnancy and childbirth increase, both maternal issues associated with higher incidence of comorbidities an...