Summary Essay Example | Topics and Well Written Essays - 250 words - 143

Summary - Essay Example In order to attain the primary aim of the research, questions such as â€Å"what is the median temperature at which intracellular ice formation occurs in human oocytes?† â€Å"How readily does intracellular ice formation (IIF) occur in human oocytes?† and â€Å"what is the effect of extracellular seeding on human oocytes?† (Trad et al. 1572-73). These questions were answered through an experimental design that used failed-to-fertilize and fresh oocytes with a germinal vesicle and polyspermic eggs. This design included visualization of how IFF first occurred at a cooling rate of 120OC/min using a programmable thermal microscope stage attached to a video microscope (Trad et al. 1574). It also involved execution of extracellular seeding at a cooling rate of 0.2 OC/min in order to decrease the occurrence of IIF and in turn increase survival rates of the freeze-thawed human oocytes. The design also used distinct cryoprotectants and decreased the median temperature in both mouse and human oocytes (Trad et al. 1575). The study portrayed that IIF occurs enthusiastically in human oocytes, and detrimental IIF can be avoided, and survival rates maximized. The results portrayed a 78%, 33% and 0% occurrence of IIF, and the 24 h post-thaw survival rate was 32%, 56%, and 93% respectively (Trad et al. 1576). Trad, Fouad  S., Mehmet Toner, and John  D. Biggers. "Effects of cryoprotectants and ice-seeding temperature on intracellular freezing and survival of human oocytes." Human Reproduction 14.6  (1998): 1569-1577.

The Reversal of the College Marriage Gap Research Paper

The Reversal of the College Marriage Gap - Research Paper Example It is generally argued that American society has been transformed in the manner that there are visible changes in the roles of men and women at the time of their marriages. (Fry and Cohn). Due to this reason, the resulting changes in the way adults marry have been manifested in the form of late marriages. This bar graph also indicates that the marriage rates of the adults under the age of 20 have subsequently declined due to the changes in the economic status of women. Another study conducted also showed that the average age for first marriage has changed during last forty years as economic hardships as well as the changing relationships between different members of the society have contributed towards the transformation which was experienced by the American society as a whole due to this shift. (National Poverty Center) Graph -2 indicates the changes which took place in terms of ages of the college educated as well as non-college educated adults at the time of their marriage. The results suggest that the average age of the college educated as well as non-college educated adults is almost same at the time of marriage. This change in the ratio of the ages has changed over the period of time, as earlier, non-college educated adults tend to marry at an early age as compared to the college educated adults. The change is however, mainly because of the difficult economic situations with which both types of individuals have to tackle.