منابع مشابه
Changes in the male voice at puberty.
The changes in the male voice in relation to the biological characteristics of puberty were assessed longitudinally in 26 boys. Speaking and singing fundamental frequencies were analysed in relation to the Tanner staging of puberty, saliva testosterone levels, and the Cooksey classification of voice analysis. There were abrupt changes in voice characteristics between Tanner stages G3 and G4 and...
متن کاملMorphological and temporal sequence of meiotic prophase development at puberty in the male mouse.
The correct sequence of meiotic prophase development in the male mouse has been established by the use of pubertal males. The first wave of spermatogenesis at this time provides a unique opportunity to study progressive meiotic development in a direct way. Air-dried and micro-spread analyses have been carried out. Temporal and morphological progression at this time is entirely consistent with t...
متن کاملGlucocorticoids and the development of agonistic behaviour during puberty in male golden hamsters.
During puberty, the agonistic behaviour of male golden hamsters undergoes a transition from play fighting to adult aggression. Repeated exposure to social stress early in puberty accelerates this transition. The present study investigated the possible role of glucocorticoids on the maturation of agonistic behaviour. First, we compared serum cortisol levels following a 20-min restraint stress du...
متن کاملAbnormalities of growth and development in puberty.
Disorders of grow th and pubertal development in the teenage years present as a spectrum of abnormalities embracing common normal variants, less common disease states, and rare disorders increasingly recognised and understood as genetic in origin. This brief review is intended to provide a guide to the diagnosis of problems presenting most commonly in adolescent/teenage children, to help with i...
متن کاملBody growth, puberty and undernutrition in the male guinea-pig.
1. Male guinea-pigs were assigned to four different groups at birth. The heaviest group of animals was severely undernourished from 21 d of age (weight gain: 1.2 g/d v. 10 g/d for normally-fed animals). 2. At 35, 45, 55 and 65 d of age in normally-fed animals, and at 45 and 55 d of age in undernourished animals, blood testosterone levels were determined by radioimmunoassay, epididymidal tissue ...
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ژورنال
عنوان ژورنال: Endocrine Abstracts
سال: 2016
ISSN: 1479-6848
DOI: 10.1530/endoabs.44.n2.1