Now showing items 1-10 of 12
Fluorescence in situ hybridization with rDNA probes on chromosomes of two nucleolus organizer region phenotypes of a species of Eigenmannia (Pisces, Gymnotoidei, Sternopygidae)
(Chromosome Research, 1996-07-27) [Artigo]
Nucleolus organizer regions (NORs) were analysed in two related and geographically close populations of Eigenmannia sp.1 (Pisces, Gymnotoidei, Sternopygidae) using silver staining and fluorescence in situ hybridization ...
Nuclear DNA content of thirty species of neotropical fishes
(Genetics and Molecular Biology, 1998-03-01) [Artigo]
The present paper reports nuclear DNA content in 30 Neotropical freshwater fish species and summarizes the data on other Neotropical species presented in the literature. Among Neotropical fishes, the nuclear DNA content ...
Does the male reproductive performance depend on the early lactation milk in rats?
(Physiology and Behavior, 1996-01-01) [Artigo]
This study investigated the role of the early lactation milk (ELM) on the male reproductive performance and the participation of GnRH on this effect in Wistar rats. Newborn males were divided into three experimental groups: ...
Histochemical study of muscle fiber types in Synbranchus marmoratus Bloch, 1795
(Annals of Anatomy, 1996-01-01) [Artigo]
The myotomal muscle of Synbranchus marmoratus was investigated using histochemical and immunohistochemical reactions. This musculature is composed of a superficial red compartment, uniformly distributed around the trunk ...
Cytogenetic studies of three species of Glandulocaudinae (Pisces, Characiformes, Characidae)
(Revista Brasileira de Genética, 1995-01-01) [Artigo]
Cytogenetic studies of three species of the subfamily Glandulocaudinae showed that Mimagoniates microlepis presents 2n = 52 chromosomes (6M + 20SM + 18ST + 8A), Mimagoniates lateralis presents 2n = 52 chromosomes (6M + ...
A morphological and ultrastructural study of the paracloacal (Scent) glands of the marsupial Metachirus nudicaudatus Geoffroy, 1803
(Acta Anatomica, 1995-01-01) [Artigo]
Morphological and ultrastructural features of the paracloacal glands of Metachirus nudicaudatus are described. Two pairs of glands, one on the right and the other on the left of the anal canal, are formed, each consisting ...
New occurrence of a macro B-chromosome in Astyanax scabripinnis paranae (Pisces, Characiformes, Characidae)
(Brazilian Journal of Genetics, 1994-01-01) [Artigo]
Cytogenetic studies performed on 17 specimens (11 females and six males) of Astyanax scabripinnis paranae from the Cascatinha stream showed that this population has 2n = 50 chromosomes (8M + 22SM + 10ST + 10A), two chromosome ...
Synaptonemal complex formation in spermatocytes of the autotriploid rainbow trout, Oncorhynchus mykiss (Pisces, Salmonidae)
(Hereditas, 1995-12-01) [Artigo]
Meiotic cells of triploid male rainbow trouts were analyzed by a surface-spreading SC technique in order to show the process of chromosome synapsis. At zygotene the formation of SCs involved, almost exclusively, two sets ...
A method for chromosome preparations from large fish specimens using in vitro short-term treatment with colchicine
(Experientia, 1993-09-15) [Artigo]
This paper describes a new technique for preparing mitotic fish chromosomes using short-term in vitro treatment with colchicine. The results show that a large number of good quality metaphases (many suitable for chromosome ...
Pharmacological reactivity of rat vas deferens in chronic and subacute lead intoxication
(Veterinary and Human Toxicology, 1991-10-29) [Artigo]