It is generally agreed that the testis is under endocrine control from the pituitary, and is influenced by physiological and paracrine factors within the organ. The aim of this study is to analyze the effect of unilateral and bilateral epididectomy on the testicular tissue growth of rats. Twentyone male old Sprague-Dawley rats (28 days old) were used in the study. Rats were assigned into 3 equa...

The purpose of the present study was to determine whether dark and pale type A spermatogonia (Ad and Ap, respectively) are mitotically active during prepubertal development and whether proliferation of these germ cells during this protracted phase of primate development occurs predominantly during infancy before gonadotropin secretion is arrested. Four neonate (1-2 days of age), four infant (4-...

the purpose of this study was to have a general view of pancreas in one species of pigeon.some disorders affect avian pancreas.pancreatitis and pancreatic degeneration have been described in many infections and deficiencies. in pigeon, lymphoid infiltration and necrosis diffusion is a common finding. after anesthesia, tissue pieces were dissected from the lobes. samples were fixed in bouin, pro...

abstract environmental factors including salinity and temperature can affect the physiology and performance of the growth of fish, so many of internal organs such as gill may be showed wide range of morphological and functional changes. fingerling common carp were exposed for 21 days in groups at 20, 25 and 30°c and three salinity levels 0, 5 and 10ppt. histological changes of gills tissue of c...

introduction: the aim of this study is to investigate the effect of one nitric oxide inhibitor on the thickness and number of circular smooth muscle cells of pylor in rat embryo. material and methods: to determine the influence of nitric oxide reduction on the muscular layer of pylor in rat embryo, in the present study, pregnant sprague-dawley rats received the no synthase inhibitor n-nitro-l-a...

Abstract Background Serrated lesions (SLs), including sessile serrated (SSL) and traditional adenomas (TSA) have become subject of increased interest for their role as CRC precursors. Purpose Study aim was to evaluate the risk develop total metachronous advanced neoplasia (T-MAN) at follow-up in patients with index SL compared a matched cohort without SL. Method Patients 45-74y SLs were identif...

Background: By the respect of some difficulties that were produced by high population we must have some information about methods that can control population. Materials and methods: In this investigation the effects of Achillea millefolium L.extract on spermatogenesis in adult Balb/ C mice were studied. The alcoholic (ethanolic) exract of flowers was prepared. The lethal (LD50) and sublethal ...

Introduction: Phasianidae is a non-migratory group of birds belonged to partridges family. One of the well-known species of partridge is Alectoris chukar, which is a medium-sized bird, larger than quails and smaller than pheasants. They are native to Asia, Africa, Europe and the Middle East and belong to the category of gallinaceous birds. Understanding the physiology and immunology of the lymp...