We develop the qualitative theory of the solutions of the McKendrick partial differential equation of population dynamics. We calculate explicitly the weak solutions of the McKendrick equation and of the Lotka renewal integral equation with time and age dependent birth rate. Mortality modulus is considered age dependent. We show the existence of demography cycles. For a population with only one...

Aim It was examined whether the single embryo transfer policy makes the treatment period longer for couples to achieve their first live birth by assisted reproductive technology. Methods This study retrospectively analyzed women who started assisted reproductive technology at younger than 40 years of age in the authors' organization. The treatment periods for couples to achieve the first live...

The "reproductive ground plan" hypothesis (RGPH) proposes that reproductive division of labour in social insects had its antecedents in the ancient gene regulatory networks that evolved to regulate the foraging and reproductive phases of their solitary ancestors. Thus, queens express traits that are characteristic of the reproductive phase of solitary insects, whereas workers express traits cha...

The problem of adenomyosis is particularly relevant for patients reproductive age, as it accompanied by the significant disturbances menstrual and generative functions. article presents results studying condition hypothalamic-pituitary-ovarian system in women age with adenomyosis.The objective: to study state benign endometrial myometrial pathology.Materials methods. main group included 120 pat...