Now showing items 11-20 of 52
Spherites in the midgut epithelial cells of the sugarcane borer parasitized by Cotesia flavipes
(Biocell, 2008-04-01) [Artigo]
Diatraea saccharalis, the main pest of sugarcane, has been controlled by Cotesia flavipes. Very little is known about the effect of parasitism on the host organs, including the midgut. The Lepidoptera midgut epithelium is ...
Karyotype differentiation patterns in species of the subfamily Scarabaeinae (Scarabaeidae, Coleoptera)
(Micron, 2008-12-01) [Artigo]
The aim of this study was to describe the karyotype of species belonging to the subfamily Scarabaeinae (Coleoptera, Scarabaeidae) and to compile the conventional cytogenetic data available in the literature for this group. ...
Sperm ultrastructure and a new type of spermiogenesis in two species of Pimelodidae, with a comparative review of sperm ultrastructure in Siluriformes (Teleostei : Ostariophysi)
(Zoologischer Anzeiger, 2008-01-01) [Artigo]
During spermiogenesis, the spermatids of the pimelodid species Pimelodus maculatus and Pseudoplatystoma fasciatum show a central flagellum development, no rotation of the nucleus, and no nuclear fossa formation, in contrast ...
Immunolocalization of aquaporins 1, 2 and 7 in rete testis, efferent ducts, epididymis and vas deferens of adult dog
(Cell and Tissue Research, 2008-05-01) [Artigo]
The transepithelial movement of water into the male reproductive tract is an essential process for normal male fertility. Protein water channels, referred to as aquaporins (AQPs), are involved in increasing the osmotic ...
Fenvalerate, A Pyrethroid Insecticide, Adversely Affects Sperm Production and Storage in Male Rats
(Journal of Toxicology and Environmental Health: Part A Current Issues, 2008-01-01) [Artigo]
The aim of this study was to investigate the potential estrogenic activity of fenvalerate by examining reproductive and fertility capabilities in Wistar rats. Adult male animals were treated for 30 d with 20 or 40 mg/kg/d ...
Spermatozoal ultrastructure in three species of the genus Uca Leach, 1814 (Crustacea, Brachyura, Ocypodidae)
(Micron, 2008-01-01) [Artigo]
Morphological aspects of spermatozoa in marine animals have been used in recent decades as phylogenetic criteria (spermiotaxonomy). This paper presents ultrastructural descriptions of the spermatozoa from Uca maracoani, ...
MyoD, myogenin and proliferating cell nuclear antigen expression in growing Nile tilapia (Oreochromis niloticus L.)
(Aquaculture Research, 2008-11-04) [Artigo]
In the present study, immunohistochemical and morphometric analysis was used to characterize variations in muscle growth performance during muscle fibre recruitment and hypertrophy. As in fisheries, fish were classified ...
Identification and description of distinct B chromosomes in Cyphocharax modestus (Characiformes, Curimatidae)
(Genetics and Molecular Biology, 2008-01-01) [Artigo]
Cytogenetic analyses were performed in Cyphocharax modestus, collected at Paranapanema River and Tietê River (São Paulo State, Brazil). A karyotype with 2n = 54 chromosomes was observed in the animals from both Brazilian ...
Chronic ethanol intake promotes double gluthatione S-transferase transforming growth factor-alpha-positive hepatocellular lesions in male Wistar rats
(Cancer Science, 2008-02-01) [Artigo]
The chronic ethanol intake influence on the gluthatione S-transferase (GST-P) and transforming growth factor alpha (TGF-alpha) expression in remodeling/persistent preneoplastic lesions (PNLs) was evaluated in the resistant ...
I Workshop on Male Reproductive Biology
(Annual Review of Biomedical Sciences, 2008-02-01) [Artigo]
Proceedings of the I Workshop on Male Reproductive Biology carried out in Brazil, from November 05 to 07, 2007.