Title of Dissertation: KINESIN MOTOR PROTEINS ARE ESSENTIAL FOR MALE GAMETOPHYTE DEVELOPMENT IN MARSILEA VESTITA Erika Jean Tomei, Doctor of Philosophy, 2016 Dissertation directed by: Professor Stephen M. Wolniak, Department of Cell Biology and Molecular Genetics The male gametophyte of the semi-aquatic fern, Marsilea vestita, produces multiciliated spermatozoids in a rapid developmental sequen...

A study was conducted to determine the breeding season of endangered Nandus nandus by observing fecundity, somatic indexes, and gonadal cycle development year-round. Samples were collected from different fish landing centers Sadar Upazila Gazipur district. GSI values N. ranged 4.26 ± 0.45 10.28 0.39 while maximum minimum observed in July October, respectively. However, GaSI showed an inverse re...

Contamination by organic and inorganic compounds remains one of the most complex problems in both brackish marine environments, causing potential implications for reproductive success survival several broadcast spawners. Ficopomatus enigmaticus is a tubeworm polychaete that has previously been used as model organism ecotoxicological analysis, due to its sensitivity ecological relevance. In pres...

The movement of micro-organisms was investigated in different cellular environments. The type of movement was described in terms of the symmetry of the cellular environment: (i) Random movement - isotropic symmetry of the environment, (ii) contact guidance - apolar symmetry of the environment and (iii) directed movement as chemotaxis and galvanotaxis - polar symmetry of the environment. To quan...

The ultrastructural details of fertilization in the fern Marsilea vestita, including gamete approach and fusion, the fate of the spermatozoid organelles and the development of a possible block to polyspermy are described. The spermatozoid approaches the egg through layers of mucilage that surround the megaspores. It moves down the neck of the archegonium into the cavity above the egg. In order ...

BACKGROUND Male infertility is a common and complex problem and, despite much research in this field, the major cause of infertility unfortunately remains unknown. Genital infection and varicocele are important causes of infertility. AIMS To compare the influence of genital infection and varicocele individually on male infertility based on semen analysis. STUDY DESIGN Cross-sectional study....

Endogenous opioid peptides play an important role in the ontogenesis of the functional and morphological parameters of the seminiferous epithelium. The aim of this study was to evaluate the effects of neonatal manipulations with naloxone, an opioid antagonist, on the population of Sertoli cells and on sperm production in adult rats. Rats were assigned to receive 8 mug per gram of body weight tw...