نتایج جستجو برای: abstractâ during past sixty years
تعداد نتایج: 2594085 فیلتر نتایج به سال:
OBJECTIVE To investigate whether semen quality has changed during the past 50 years. DESIGN Review of publications on semen quality in men without a history of infertility selected by means of Cumulated Index Medicus and Current List (1930-1965) and MEDLINE Silver Platter database (1966-August 1991). SUBJECTS 14,947 men included in a total of 61 papers published between 1938 and 1991. MAI...
Observed increases in ocean heat content (OHC) and temperature are robust indicators of global warming during the past several decades. We used high-resolution proxy records from sediment cores to extend these observations in the Pacific 10,000 years beyond the instrumental record. We show that water masses linked to North Pacific and Antarctic intermediate waters were warmer by 2.1 ± 0.4°C and...
OBJECTIVE Describe and analyze the structural configuration of malaria in Colombia since 1960 to 2004 where the phenomena of persistence, resurgence and resistance as well as the main determinants associated to these phenomena. METHODS A comparative study of the history of malaria and its trend was conducted in Colombia since 1960-2004. Secondary and primary information about the frequency an...
Detection of recent natural selection is a challenging problem in population genetics. Here we introduce the singleton density score (SDS), a method to infer very recent changes in allele frequencies from contemporary genome sequences. Applied to data from the UK10K Project, SDS reflects allele frequency changes in the ancestors of modern Britons during the past ~2000 to 3000 years. We see stro...
The interrelationships of serum lipids, that is, free cholesterol, esterified cholesterol, total cholesterol, lipid phosphorus, total lipids, neutral fats and Sf 10-20 molecules * ere determined in 91 women and 38 men past the age of 65 years. It was observed that all the serum lipids with the exception of neutral fats were statistically higher in the women. Furthermore, it was shown that the s...
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