배우자로는 날 닮은 사람이 최고
과학동아 2002년 09호
것으로 간주되기 때문이다.유전적으로 유사한 개체간의 결합은 ‘근교약세’(inbreeding depression)라는 심각한 결함을 가져온다. 일반적으로 이렇게 태어난 후손들은 유아사망률이 높고, 발달 장애, 심장의 기형, 청각상실, 왜소증 등의 결함을 갖는 경우가 많다는 것이 그동안의 연구를 통해 알려져 ...
것으로 간주되기 때문이다.유전적으로 유사한 개체간의 결합은 ‘근교약세’(inbreeding depression)라는 심각한 결함을 가져온다. 일반적으로 이렇게 태어난 후손들은 유아사망률이 높고, 발달 장애, 심장의 기형, 청각상실, 왜소증 등의 결함을 갖는 경우가 많다는 것이 그동안의 연구를 통해 알려져 ...
저기압 중심부의 최대 풍속이 17m/초 미만인 경우는 약한 열대성저기압(TD: tropical depression)으로 분류하고, 중심부 최대 풍속이 17-32m/초인 경우 열대성폭풍(TS: tropical storm), 중심부 최대 풍속이 32m/초 이상일 때에만 태풍(Typhoon)이라 부른다.열대저기압은 대체로 남·북위 8-15도 지역의 해양에서 ...
is dassified as a "tropical depression,"and given a number by the National Hurricane Center.If the winds in a tropical depression grow in intensity to 40mph,it is re-classified as a "tropical storm,"and it receives a name.When the winds in the storm reach 75mph(120kph),the storm is upgraded to a hurricane.The winds of a hurricane are structured around a central"eye",which is an area that is ...
that live in it.Dust in the form of a storm is particularly dangerous. Back in the 1930s, the miseries of the Great Depression were compounded when much of the Midwest turned into what was called the Dust Bowl. When the Indians lived there, the great sweeps of grasslands remained intact and fertile, supporting immense herds of bison and pronghorns.Grazing by the native animals did not destroy ...
functioning, but with such things as diminished pain tolerance, digestive upsets, more cardiovascular disease and depression.What to do? When the Deaconess group tested people who work night shifts, they found that those who managed night work better were evening types, who tend to feel more awake and alive as the day wears on. Morning types, who wake up raring to go, do not adapt to night ...
quartz may be up to 40 feet thick, and that there may be a place in the ocean just west of Cuba where there is a depression large enough to represent the scar.Unfortunately, Bohor and Seitz have not been able to examine the deposit of shocked quartz for themselves. Negotiating permission to work in a hostile Cuba is not easy, so they are forced to go by second -hand descriptions.Nevertheless, ...