Une analyse fine de gamétogenèse par examen microscopique des gonades permet d'identifier et de quantifier les principaux types de cellules dans le testicule, au cours du cycle sexuel
Nous disposons maintenant de quelques informations sur les mécanismes qui contrôlent la gamétogenèse et son déroulement au cours du cycle reproducteur. Les effets des facteurs du milieu les plus importants commencent aussi à être mieux connus et l'ensemble de ces connaissances ainsi acquises permet actuellement de maîtriser certaines phases de la r...
La définition de quelques paramètres étho-écologiques est d'abord donnée afin de caractériser l'alimentation de Leptosynapta galliennei. La structure et l 'ultrastructure du tube digestif de L. galliennei sont complétement décrites. Sa paroi est constituée de trois couches tissulaires, un épithélium digestif monostratifié, une couche conjonctive, u...
Objetivo. Estudiar el ciclo sexual y la fecundidad del pejerrey patagónico, especie de alto valor comercial y deportivo, en el embalse Ezequiel Ramos Mexía (Neuquén, Río Negro; Argentina). Materiales y métodos. Se colectaron 9307 ejemplares. El ciclo sexual se estudió mediante la observación macroscópica de las gónadas y la fecundidad absoluta se c...
Physalaemus henselii (Peters, 1872) is a little known leiuperid frog that has not been studied since the 1960s. Herein, we redescribe its advertisement call, and assess the female sexual cycle and the reproductive period on the basis of the macroscopic analysis of the ovaries and field observations. The Ovarian Size Factor (OSF) was calculated. Th...
Published in Neuroscience and behavioral physiology
A microspectral fluorescence-histochemical method was used to study the sympathetic neural apparatus of the rat uterus at different phases of the sexual cycle. Most nerve fibers, as perivascular plexuses and terminals emanating from them, were located in the myometrium. It is suggested that the uterus contains reserve ("silent" nerve fibers, which ...
Published in Russian Journal of Developmental Biology
The sexual cycle of Japanese mitten crab Eriocheir japonica (de Haan, 1835) in its northern range in water bodies of the Primorye proved to have specific properties including changed seasonal dynamics of gonad maturity stages, delayed spawning period, and reduced breeding season. The ovary color regularly changed during the gonad growth in females,...
Anthracnose, caused by Colletotrichum sublineolum, has been one of the most destructive diseases affecting sorghum crops in Brazil. This study aimed to characterize wild and mutant strains through morphological and cultural characteristics, conidiation, and mating-type. A high variability was observed among strains when evaluated through radial gro...
Published in Toxicologic pathology
In preclinical studies, it is important to know whether the animals used are sexually mature or not. Precise data have not yet been published, however, about the histological features of the female reproductive organs during the peripubertal period or about the age of acquisition of sexual maturity in the minipig. The histological characteristics o...
Published in Russian Journal of Marine Biology
Oogenesis, spermatogenesis, and the sexual cycle of the bivalve Corbicula japonica in the estuary of the Kievka River (Primorye, Sea of Japan) were studied. The stages of development of germ cells and the role of auxiliary cells in gonads during vitellogenesis were described. The features of sperm morphology were recorded. It was shown that the rep...
