Results 151 to 160 of about 186,632 (207)
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Nature, 1959
D. J. MERRELL1 says in regard to the fertility of matings of Drosophila when employing males less than 24 hr. old and males aged for seven days: “The imaged flies were left together in the creamers for periods ranging from 18 to 72 hours; the aged flies were separated after 2 to 7 hours, the variation in time being due to differences in the length of ...
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D. J. MERRELL1 says in regard to the fertility of matings of Drosophila when employing males less than 24 hr. old and males aged for seven days: “The imaged flies were left together in the creamers for periods ranging from 18 to 72 hours; the aged flies were separated after 2 to 7 hours, the variation in time being due to differences in the length of ...
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Sexual Maturation in Thai Boys
Journal of Pediatric Endocrinology and Metabolism, 2010A worldwide secular trend towards earlier onset of puberty in girls has been noted during recent years. However, the data on sexual maturation of boys are relatively scarce and normative data of sexual maturation in Thai boys are still lacking.To determine the age of secondary sexual maturation in normal Thai boys.Three hundred healthy urban boys aged ...
P, Mahachoklertwattana +5 more
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Reproduction in Domestic Animals, 2008
ContentsIn this review, we describe the process of sexual maturation in the bull calf. The testes of the bull grow relatively slowly until approximately 25 weeks of age and then a rapid phase of growth occurs until puberty, at 37–50 weeks of age. During the early postnatal phase of slower growth of the testis pre‐spermatogonia and some spermatogonia ...
N, Rawlings +3 more
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ContentsIn this review, we describe the process of sexual maturation in the bull calf. The testes of the bull grow relatively slowly until approximately 25 weeks of age and then a rapid phase of growth occurs until puberty, at 37–50 weeks of age. During the early postnatal phase of slower growth of the testis pre‐spermatogonia and some spermatogonia ...
N, Rawlings +3 more
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Understanding premature sexual maturation
Paediatrics and Child Health, 2011Abstract Premature sexual maturation is a general term encompassing precocious puberty as well as several normal variants in both boys and girls. It is important to be able to determine the specific cause in order to formulate an appropriate plan of management.
Fiona J. Ryan +2 more
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2011
Abstract Premature sexual maturation is a frequent cause for referral in paediatric endocrinology. Although clinical evaluation will suffice to reassure the patient and family in a majority of cases, premature sexual maturation can reveal severe conditions and need a thorough evaluation to identify its cause and potential for progression,
Jean-Claude Carel, Juliane Léger
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Abstract Premature sexual maturation is a frequent cause for referral in paediatric endocrinology. Although clinical evaluation will suffice to reassure the patient and family in a majority of cases, premature sexual maturation can reveal severe conditions and need a thorough evaluation to identify its cause and potential for progression,
Jean-Claude Carel, Juliane Léger
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Etiologies of Sexual Maturation: A Model System Based on the Sexually Maturing Rat
1976Publisher Summary This chapter discusses the etiologies of sexual maturation based on the studies performed in postulated models in rats and children. The chapter outlines the changes in blood in luteinizing hormone (LH) and follicle-stimulating hormone (FSH) during maturation in rats and other animal models.
W D, Odell, R S, Swerdloff
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Light intensity and sexual maturity
American Journal of Physical Anthropology, 1969AbstractThere are confirmable clines, by latitude, of melanin concentration in pigmentation for man as well as other mammals and birds. This has been suggested to be, in man, a result of the importance of vitamin D synthesis which can be inhibited by darker skins in higher latitudes.
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Pediatrician, 1988
Absence of any sign of gonadal development (i.e. increase in size of the testes or presence of breast budding) before the age of 13 years in girls and 14 years in boys represents the condition of delayed sexual maturation. After this age, the patient should be thoroughly clinically examined and a basic biological work-up should be performed ...
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Absence of any sign of gonadal development (i.e. increase in size of the testes or presence of breast budding) before the age of 13 years in girls and 14 years in boys represents the condition of delayed sexual maturation. After this age, the patient should be thoroughly clinically examined and a basic biological work-up should be performed ...
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2023
The pattern of somatic growth reflects the variable allocation of energy and materials throughout ontogeny, with direct impact on an individual’s fitness, and is therefore expected to be adaptive with regard to the different requirements of each life stage (Arendt 1997, Nylin and Gotthard 1998).
Farias, Nahuel Emiliano +2 more
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The pattern of somatic growth reflects the variable allocation of energy and materials throughout ontogeny, with direct impact on an individual’s fitness, and is therefore expected to be adaptive with regard to the different requirements of each life stage (Arendt 1997, Nylin and Gotthard 1998).
Farias, Nahuel Emiliano +2 more
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