A Demographic Study of male infertility and Analysis of semen parameters

Infertility and problems of impaired fecundity have been a concern through ages and is also a significant clinical problem today, which affects 8–12% of couples worldwide. Of all infertility cases, approximately 40–50% is due to "male factor" infertility and as many as 2% of all men will exhibit suboptimal sperm parameters. It may be one or a combination of low sperm concentration, poor sperm motility, or abnormal morphology. Aim and objective: Demographic study of male infertility and assessment of abnormalities in semen parameters. Settings and Design: A cross-sectional study was conducted on 702 males who came to test for infertility to Saveetha Medical College and hospital to evaluate the parameters of semen and male infertility causes. Methods and Material: The participants were divided into two categories and one group was evaluated through a questionnaire for occupation, personal habits, exposure, family history, and the other category was evaluated on lab findings of various parameters to check the yearly variation in parameters of semen. Statistical analysis: Descriptive statistics. Results: On the evaluation of parameters of semen in combination with a questionnaire to 44 patients, it shows that alcoholics and smokers have low semen volume, increase in liquefaction time and increase in viscosity is most commonly seen in youngsters like students and IT professional. Conclusion: In our study low semen volume, delayed liquefaction time and increase in viscosity is most commonly seen in youngsters like students and IT professional with a history of alcohol and smoking and stress

Historiography and empirical base of ethnodemographic studies of Ukrainians in the Republic of Moldova at the end of the XX – beginning of the XXI century

The article presents studies on demography in the Republic of Moldova in the late XX – early XXI century. It is noted that after 1991 the close attention of researchers, journalists, public organizations is focused on the problems of demography. The authors trace the dynamics of demographic processes in Moldova, determine the causes and possible consequences of negative processes, offer solutions to improve the situation. Conventionally, we can divide all publications into three categories: 1) works that consider the demographic situation and its dynamics in the country as a whole; 2) work on migration issues; 3) works on ethnodemography, i.e. dedicated to demographic processes in the environment of ethnic communities. However, there are not many special ethno-demographic studies on Ukrainians in Moldova. The article also discusses the main sources for ethnodemographic research: population censuses, current accounting of demographic events, special sample surveys, lists and registers of the population. An analysis of each group of sources is given from the point of view of their informativeness for a full-fledged ethno-demographic study of Ukrainians in Moldova

Diachronic modeling of the population within the medieval Greater Angkor Region settlement complex

Angkor is one of the world’s largest premodern settlement complexes (9th to 15th centuries CE), but to date, no comprehensive demographic study has been completed, and key aspects of its population and demographic history remain unknown. Here, we combine lidar, archaeological excavation data, radiocarbon dates, and machine learning algorithms to create maps that model the development of the city and its population growth through time. We conclude that the Greater Angkor Region was home to approximately 700,000 to 900,000 inhabitants at its apogee in the 13th century CE. This granular, diachronic, paleodemographic model of the Angkor complex can be applied to any ancient civilization.