نتایج جستجو برای: male reproductive
تعداد نتایج: 404175 فیلتر نتایج به سال:
BACKGROUND Research institutions and donor organizations are giving growing attention to how research evidence is communicated to influence policy. In the area of sexual and reproductive health (SRH) and HIV there is less weight given to understanding how evidence is successfully translated into practice. Policy issues in SRH can be controversial, influenced by political factors and shaped by c...
Male coalition-like formation, recently found in stump-tailed macaques ( Macaca arctoides ), occurs when several top-ranking males collaboratively guard females to prevent mating with other rival and actively share secured opportunities their allies. We lack a comprehensive understanding of the proximate mechanisms underlying such male coalitions, e.g., effect genetic relatedness. Such cooperat...
Sexual conflict over mating rate is both pervasive and evolutionarily costly. For females, the lifetime reproductive fitness costs that arise through interactions with potential mates will be influenced by the frequency of such interactions, and the fitness cost of each interaction. Both of these factors are likely to be influenced by variation in operational sex ratio (OSR) and population dens...
Relaxin (RLN) belongs to a family of hormones structurally related to insulin and presents a broad spectrum of actions. Humans have three forms of RLN, encoded by three different genes (RLN1, RLN2 and RLN3), but nonprimate vertebrates have only two forms of relaxin (RLN1 and RLN3). RLN1 of these animals is encoded by Rln1, orthologous to the human RLN2 gene, and both genes, Rln1 and human RLN2,...
Male reproductive health has deteriorated in many countries during the last few decades. In the 1990s, declining semen quality has been reported from Belgium, Denmark, France, and Great Britain. The incidence of testicular cancer has increased during the same time incidences of hypospadias and cryptorchidism also appear to be increasing. Similar reproductive problems occur in many wildlife spec...
Delayed childbearing is a common phenomenon in industrialized countries. This review focuses on age-associated alterations of male fertility and genetic risks. Semen volume, sperm motility and sperm morphology decrease with age, whereas the data concerning sperm concentration are conflicting. The age-related changes of semen parameters reflect the histological modifications which are found to v...
Correspondence to: Dolores Mruk and C. Yan Cheng; Email: [email protected] and [email protected] Contaminants such as cadmium, bisphenol A and lead pollute our environment and affect male reproductive function. There is evidence that toxicant exposure adversely affects fertility. Cadmium and bisphenol A exert their effects in the testis by perturbing bloodtestis barrier funct...
Infertility is an uncommon manifestation of genitourinary tract tuberculosis. Anatomic obstruction by granulomas or distortion of the normal anatomy by fibrosis surrounding the reproductive tract structures is the commonest cause of infertility. The diagnosis is usually based on a suggestive history along with evidence of granulomatous infection on a tissue sample. The management depends on the...
Many diseases and medications can affect the urinary system and its function. Assessment of the male genitalia is accomplished with inspection and palpation. It is important to chart what is seen, what is felt, and what the patient reports.
Many health problems are related to lifestyle and dietary factors. Increasing trend in reproductive disorders observed in recent years may be associated at least in part with these factors, which are compounded by some of the new emergent life styles. The data available suggests that lifestyle factors such as obesity, tobacco smoking or chewing, alcohol and some of the illicit drugs like cocain...
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