Objectives: To examine physiological influences of adolescent sexual behaviour, including associated psychosocial factors. Methods: Systematic review. Results: Thirteen studies met the inclusion criteria relating to adolescents, physiology and sexual behaviour. We excluded studies relating to abnormal development. Findings highlighted hormonal and gender differences. Females appear to be more i...

conclusions according to the obtained results, females in the rural areas had lower sexual function than the ones in the urban areas. it is suggested to establish female sexual health units in healthcare centers to give female sexual function consultation adjusted with awareness and culture of females and consider the existing problems. background healthy sexual function can be considered as an...

Parthenogenesis, embryonic development of an unfertilized egg, was studied for many years in turkeys. In fact, as many as 49% of unfertilized Beltsville Small White turkey eggs develop embryos. However, no research exists on parthenogenesis in quail. The Chinese painted quail is a close relative of the more common Japanese quail and, unlike turkeys or chickens, the small Chinese painted quail r...

background: the incidence of sexual transmitted infections (stis) and hiv/aids is globally higher in young people. this study evaluated the prevalence of sexual reproductive behaviors among undergraduate students of mashhad, iran. methods: the study was conducted on 605 students in twelve non-medical faculties of a great university of mashhad. a self-administered questionnaire was completed on ...

Di(2-ethylhexyl) phthalate (DEHP) is used to make polyvinyl chloride (PVC) plastic tubing soft and flexible. Animal data show that adverse effects of DEHP exposure may include reduced fertility, reduced sperm production in males, and ovarian dysfunction in females. Known treatments that involve high DEHP exposures are blood exchange transfusions, extracorporeal membrane oxygenation (ECMO), and ...

Intensive size-selective harvesting can drive evolution of sexual maturity at smaller body size. Conversely, prehistoric, low-intensity subsistence harvesting is not considered an effective agent of size-selective evolution. Uniting archaeological, palaeontological and contemporary material, we show that size at sexual maturity in the edible conch Strombus pugilis declined significantly from pr...

The article describes the problems, which are of greatest interest for formation fish broodstock, such as process gameto- and gonadogenesis duration spawning cycles in broodstock reared artificial conditions. Under Research Experimental Aquaculture Complex BIOS CaspNIRKH formed paddlefish 63 females matured 2020. There were studied 11 born 2002 2003, whose roe was taken food purposes. following...

Heibo, E. 2003. Life-history variation and age at maturity in Eurasian Perch (Perca fluviatilis L.) This thesis deals with life-history variation in perch, with special focus on age at maturity. We conducted field studies to uncover the variation within short geographic distances and a literature review to study variation on a large geographic scale in order to reveal some factors affecting lif...

the age of maturity is one of the most important issues in the jurisprudence book” hijr”. the shiite and sunnite jurisprudents discussing prohibition of repossessing the properties deals with the maturity conditions. in this part they study maturity age of male and female and neuter. in this article jurisprudentially researching the writer reviews the verses and riwayas and jurisprudents’ opini...