نتایج جستجو برای: reproductive hormones
تعداد نتایج: 162520 فیلتر نتایج به سال:
in scientific research are often males. Such bias is evident because researchers avoid using female animals as they are concerned that their reproductive cycles and hormone fluctuations may confound the results of their studies, which may lead to some disparity observed between preclinical studies and clinical trials. The National Institutes of Health (NIH) in the United States has been directi...
Complex organismal traits such as body size are influenced by innumerable selective pressures, making the prediction of evolutionary trajectories for those traits difficult. A potentially powerful way to predict fitness in natural systems is to study the composite response of individuals in terms of performance measures, such as foraging or reproductive performance. Once key performance measure...
OBJECTIVES A number of factors involved in the control of energy balance and metabolism act as modulators of gonadal axis. Ghrelin, a peptide secreted from the stomach and hypothalamus, has emerged as an orexigenic food intake controlling signal acting upon hypothalamus. Recently, the potential reproductive role of ghrelin has received great attention. This study was designed to investigate the...
Human behavior is influenced by many factors; among these are hormones or other chemicals produced by various tissues or glands throughout the body. This paper reviews the current status of research relating hormones to human behavior. To provide background for this discussion, a brief history of this field and a primer in behavioral endocrinology are provided. Although, reproductive hormones, ...
Although hormones are key regulators of many fitness and life history traits, the causes of individual level variation in hormones, particularly in wild systems, remain understudied. Whilst we know that androgen and glucocorticoid levels vary within and among individuals in mammalian populations, how this relates to key reproductive processes such as gestation and lactation, and their effects o...
This chapter explores the hypothalamo-pituitary system and provides a brief description of the principal hormones of the anterior and posterior lobes of the pituitary gland. The actions of the individual hormones are discussed in further detail in the chapters dealing with their target glands: hormonal control of the thyroid, parathyroid and adrenal glands is discussed in Chapter 16, hormonal c...
OBJECTIVE Glioma is the most common primary malignant brain tumor in adults, responsible for 75% of adult primary malignant brain tumors, yet aside from its association with ionizing radiation, its etiology is poorly understood. Sex differences in brain tumor incidence suggest that hormonal factors may play a role in the etiology of these tumors, but few studies have examined this association i...
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