单选题
发布日期:2022-07-18
群体性事件
突发事件
突发事故
恐怖袭击
【释义】形容时空的常态。平常时候,平日,平素;太平时日,和平时期。
发生是一个汉语词汇,拼音是fā shēng,意思是原来不存在的事情出现了。
部门,汉语词语,拼音读bù mén,指的是一个组织的机构。
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Passage1Lonely people, it seems, are at greater risk than the gregarious of developing illnesses associated with chronic inflammation, such as heart disease and certain cancers.A paper published last year in the Public Library of Science, Medicine, shows the effect on mortality of loneliness is comparable with that of smoking and drinking after examining the results of 148 previous studies and controlled for factors such as age and pre-existing illness.Steven Cole of the University of Califormia, Los Angeles, thinks he may know why this is so.He told the American Association for the Advancement of Science meeting in Washington,D.C., about his work studying the expression of genes in lonely people. Dr. Cole harvested samples of white blood cells from both lonely and gregarious people. He then analysed the activity of their genes, as measured by the production of a substance called messenger RNA. This molecule carries instructions from the genes telling a cell which proteins to make. The level of messenger RNA from most genes was the same in both types of people. There were several dozen genes, however, that were less active in the lonely, and several dozen others that were more active. Moreover, both the less active and the more active gene types came from a small number of functional groups.Broadly speaking, the genes less active in the lonely were those involved in staving off viral infections. Those that were more active were involved in protecting against bacteria. Dr. Cole suspects this could help explain not only why the lonely are iller, but how, in evolutionary terms, this odd state of affairs has come about.The crucial bit of the puzzle is that viruses have to be caught from another infected individual and they are usually species-specific. Bacteria, in contrast, often just lurk in the environment, and may thrive on many hosts. The gregarious are therefore at greater risk than the lonely of catching viruses, and Dr. Cole thus suggests that past evolution has created a mechanism which causes white cells to respond appropriately. Conversely, the lonely are better off ramping up their protection against bacterial infection, which is a bigger relative risk to them.What Dr. Cole seems to have revealed, then, is a mechanism by which social environment reaches inside a person's body and tweaks its genome so that it responds appropriately. It is not that the lonely and the gregarious are genetically different from each other. Rather, their genes are regulated differently, according to how sociable an individual is. Dr. Cole thinks this regulation is part of a wider mechanism that tunes individuals to the circumstances they find themselves in.What risk may lonely people run according to the first paragraph?
通常种皮容易破裂降低活力的种皮颜色是()。
为什么室内要保持通风?
假设以5年期政府债券的空头为10年期政府债券的多头进行保值,那么,如果收益率曲线变陡的话,在已经对收益率曲线上的平行变动作了保值的前提下,该多头的10年期债券的内在经济价值会()
当事人申请农村土地承包经营纠纷仲裁,应符合的条件有( )。
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脱髓鞘病变不包括()
青年期患者的心理护理重点不包括()
肘关节骨折脱位可能并发()
征信机构不得采集()、有价证券、商业保险、不动产的信息和纳税数额信息。但是,征信机构明确告知信息主体提供该信息可能产生的不利后果,并取得其书面同意的除外
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广播、电视、报纸、电信等媒体向社会传播气象预报和灾害性天气警报,下列哪个说法是正确的:()
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广播电视
电视广播
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