164
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#161
Szerintem meg nem csak a Holdon nem jártunk, hanem még az ISS-re sem tette ember a lábát. És néha a földi életet is megkérdőjelezem, hétköznap 10 után pl tökre kihalt a város.
Anyám szerint meg egyáltalán, nz nem is élet, ami itt van!
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#162
Légkörben még a földi gravitáció sem nagyon akadályozza meg az apró porszemek lebegését a levegőben (súly, felület és Brown-mozgás). Egy aszteroida felszínén a több nagyságrenddel kisebb gravitáció még kevésbé. A légszűrés sokkal hatékonyabb. -
Epikurosz #163 Ne butáskodj!
Az ISS-en van mikrogravitáció. -
Epikurosz #164 Little is known about the effect of microgravitation placental development. Data from COSMOS flight 1541 indicated that placental growth and development is modified by exposure to microgravity from pregnancy days 13-18; although, fetal development was not affected. The NIH-R.1 payload onboard STS66 exposed the developing conceptus to microgravity beginning immediately prior to placental development and terminated after formation of the definitive layers of the placenta; the labyrinth, junctional zone, and trophospongium. Placental development involves the vectoral movement of cells to achieve the final anatomical form, and the role of gravity in this process has not been evaluated. Adequate placental development is critical to reproductive success in mammals, including humans, and successful human colonization of space or establishment of rodent colonies in space for further scientific studies of all types are dependent upon a thorough understanding of the affect of space flight on reproduction and development. The objective of the proposed studies was to access the effect of microgravity on placental growth and development. Accordingly, the PI is requested placental/implantation site tissues recovered from pregnant rats returning from the space mission, and from asynchronous, and vivarium control groups. The first specific aim of these studies was to determine the morphology of the placenta and decidua, and their organizational relationship immediately upon return from space (G17-G20) and at the time of caesarean-section (G23) or delivery. Tissues from all animal groups were prepared for light microscopic examination and their morphology compared. The second specific aim was to assess the functional differentiation of trophoblast cells of the labyrinth and trophospongial regions of the placenta by evaluating the expression of specific developmentally expressed proteins, placental lactogens, and glucose transporters, and making comparison among groups." (Innen)