نتایج جستجو برای: testicular axis
تعداد نتایج: 123210 فیلتر نتایج به سال:
In many organisms, food availability is a proximate cue that synchronizes seasonal development of the reproductive system with optimal environmental conditions. Growth of the gonads and secondary sexual characteristics is orchestrated by the hypothalamic-pituitary-gonadal (HPG) axis. However, our understanding of the physiological mechanisms by which food availability modulates activity of the ...
Background & Aims: In addition to the environment, age, temperature, nutrition and medicine, sex hormones including testosterone, FSH and LH are the most important factors affecting spermatogenesis and fertility. Sesame seeds with phytoestrogens and antioxidant activity in its lignans can affect pituitary-gonadal axis and increase fertility directly or indirectly. The purpose of this study...
Objectives: Manufacturing and spraying workers of organophosphate pesticides (OPs) could suffer from testicular spermogenesis and steroidogesis dysfunctions particularly when their degradation is subnormal. Aim: Exploration of spermatogenic and endocrinologic testicular functions and paraoxonase/arylesterase (PON1/ARY) degrading activities of the organophosphate parathion and its oxon in their ...
Background Testicular torsion is surgical emergency. Prompt diagnosis and treatment of testicular torsion is essential for testicular viability. At surgical exploration, the spermatic cord is seen twisted a variable number of times around its longitudinal axis. There is scant data regarding the degree of twisting and its association with testis outcomes. The purpose of our study is to explore h...
A recently proposed by the authors impulsive mathematical model of non-basal testosterone secretion of the hypothalamic-pituitary-testicular axis in the male is considered. Conditions for existence of periodic solutions in the model, their parametrization and stability are studied. Parameter bifurcations which lead to periodic oscillations of hormone levels with one or two pulses of gonadotropi...
Bone is emerging as a versatile endocrine organ and its interactions with apparently unrelated organs are being more widely recognized. Osteocalcin (OCN), polypeptide hormone secreted by osteoblasts, has been found to exert multiple functions through metabolically active form, uncarboxylated OCN (uOCN). Mounting evidence shown that following binding G-protein coupled receptor 6a (Gprc6a) in the...
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