Enkephalins play a major role in reproductive physiology in crustaceans; however their role in reproductive development in insects is largely unknown. We investigated the effect of exposure to exogenous leucine-enkephalin (Leu-Enk), methionine-enkephalin (Met-Enk), and the opioid antagonist naloxone on gonad development in the Eastern lubber grasshopper, Romalea microptera. Injection of either ...

Yearly, testosterone (T) levels fluctuate as many vertebrates cycle through reproductive and non-reproductive periods. Among many temperate birds, it is well established that levels of T peak as gonads recrudesce for breeding and then fall as gonads regress prior to the non-breeding season. While the tissues producing breeding season T are well studied, the tissues responsible for non-breeding ...

The purpose of this study was to investigate the effects of chlordane and lindane on reproduction obstacles and endocrine disruption in female green neon shrimp (Neocaridina denticulata). Individuals of N. denticulata, a common inhabitant of freshwater systems in Taiwan, was exposed to different levels of chlordane (1 and 10 ngl(-1)) and lindane (0.1 and 1 microgl(-1)). The reproductive ability...

Cancer of the reproductive tract is an important cause of morbidity and mortality among women worldwide. In this study we evaluated the influence of diagnostic categories, age and reproductive factors on antioxidant enzymes and lipid hydroperoxides in the blood of gynaecological patients diagnosed with endometrial polyp, myoma, hyperplasia simplex, hyperplasia complex and endometrial adenocarci...

The study investigated how unequal gender relations inhibit the attainment of women's reproductive rights. It examined whether women can choose if and when to marry, who to marry/have sex with, ability to negotiate sex with spouse, and their access to family planning. Based on theoretical orientation from gender-sexuality framework, this paper employed the qualitative research design. The main ...

Contests mediate access to reproductive opportunities in almost all species of animals. An important aspect of the evolution of contests is the reduction of the costs incurred during intra-specific encounters to a minimum. However, escalated fights are commonly lethal in some species like the honeybee, Apis mellifera. By experimentally reducing honeybee queens' fighting abilities, we demonstrat...

Progesterone is essential for endometrial receptivity and successful establishment of pregnancy. Either an insufficient progesterone concentration or an insufficient response to progesterone, therefore can lead to infertility and pregnancy loss. Assessment of the role that either progesterone insufficiency or inadequate progesterone response plays in human reproductive failure has been difficul...

Synopsis – The prospect of midwifery legislation in the Canadian Province, Ontario, is investigated in light of other reproductive legislation, especially that concerning new reproductive technologies. The idea that midwifery symbolizes a woman-centered approach to birth is criticized and related to a number of reproductive issues in the hope that the lack of concern for and control by women ca...

The paper deals with the problem of representation imitation processes and productive activities in school essays. prerequisites for study are approaches to analysis essays as a type creative work, which reflects one or another degree imitative communicative activity person, well relevance problems determining features integration reproductive communication, creativity linguistic personality te...