Human oogenesis in organ culture

The authors compared the extent of development of the germ cells of the human fetus ovaries developing in the organ culture and of control ovaries obtained of fetuses of "equivalent" age. The capacity to enter the meiosis prophase under conditions of the organ culture was expressed by the germ cells of fetuses of 8-9 week of gestation, and older; only individual oocytes reached the leptotene stage in the explants of the ovaries of 7-8 week fetuses. The oocytes at the leptotene, zygotene and pachitene stage appeared in the culture at the same periods as in the organism. However, the percentage of cells of these stages in the explant was as a rule lower than in control ovaries. In case of pulse administration of thymidine-3H into the culture labeled oocytes at the zygotene stage appeared in 4, and at the pachitene stage - in 14 days.     

Development of the Combined Technology of Modification of the Surface of Titanium Implants by Laser Radiation with Subsequent Plasma Spraying of Biocompatible Coatings

Metallurgist - We propose a combined technology for the modification of the surfaces of titanium implants by laser radiation followed by the plasma spraying of biocompatible coatings. We performed...     

Characteristics of actual nutrition and health of children in regions of the Russian Federation]

In the article the problems of actual nutrition and state of Russian children health are considered. The carried out examinations of the vitaminous status have shown presence of a deficit of vitamins E, B1, B6, PP, and also calcium, phosphorus, iron lactate, zinc in daily ration of children. The inadequate organization of C-vitaminization of boiled food in children establishments, low supplying of learning schools by a hot food, insufficient use of products from suer milk, fish, juices, meat products, butter, vegetables, fruit, eggs in a nutrition of children is marked. In same of regions of Russia the inadequate nutrition organization of early age children is marked. The positive experience of areas (St.-Petersburg, Ul'yanovsk, Rostov, Smolensk, Kirov, Kurgan, Samara region, Republic Buryatiya) on organization of children and juveniles nutrition, development of the regional programs on a children's food industry evolution, on providing of early age children by food stuffs, on improvement of a schoolboys nutrition, on improvement a nutrition of children in children's preschool establishments is analyzed. The positive experience of nutrition organization of children on an example of the Ryazan and Arkhangel'sk regions surveyed. The actual information about a vitaminization, quality and safety of children's nutrition, ready dishes in the organized collectives on data of 1999 are given.