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枣阳市妇幼保健中医院做孕检多少钱管助手襄阳南漳县人民中心医院预约

2019年06月25日 23:39:35    日报  参与评论()人

襄樊第一人民医院肛肠怎么样襄阳四院治疗附件炎怎么样When human females are pregnant, theyre advised to stay away from alcohol, for fear of harming the fetus.当人类女性怀时,人们就会建议她们戒酒,以免伤害胎儿。And most parents refrain from giving their infants bottles full of whiskey or beer, for obvious reasons.大多数父母都不会给婴儿接触满瓶的威士忌或者啤酒,原因是显而易见的。But if youre a fruit fly, literally dousing your offspring in alcohol is apparently one of the best ways to protect them from danger, particularly from certain types of wasps.但如果你是一只果蝇,毫不夸张的说,你把后代浸没在酒精中是保护它们远离危险的最好办法之一,特别是这样能避免黄蜂的伤害。How and why?如何以及为什么要这样做?Lets back up a bit.让我们来回顾一下。First, certain types of wasps prey on fruit flies by injecting eggs inside fruit fly larvae.首先,特定类型的黄蜂会将卵注入果蝇幼虫中,以捕食果蝇。Unless an infected larva kills the wasp egg, it hatches and the wasp larva eats its way out from inside the fruit fly larva, killing it.除非受感染的果蝇幼虫杀死黄蜂卵,否则当黄蜂卵孵化出来后,黄蜂幼虫将会由内而外吞噬果蝇幼虫,将其杀死。One way for fruit fly moms to protect against this gruesome fate is to lay their eggs in an alcohol soaked environment, such as fermenting fruit, when they see that parasitic wasps are around.果蝇妈妈为防止幼虫遭受厄运的其中一种办法是,当看到寄生蜂的出现时,将卵产在酒精浸泡的环境之中,例如发酵的水果里。Although alcohol is toxic to fruit flies, its even more toxic to wasps, which, unlike fruit flies, have not evolved a high level of alcohol tolerance.尽管酒精对果蝇有毒,但酒精对黄蜂的毒性更大。与果蝇不同,黄蜂还没有进化成对高浓度酒精的耐受性。So if the larvae eat enough alcohol rich food, it can kill the wasp egg and keep it from hatching.所以如果果蝇幼虫吃了足够富含酒精的食物后,它就可以杀死黄蜂卵并使之不能孵化。Apparently, fruit flies are not the only fly species to use alcohol to protect their young.很明显,果蝇并不是利用酒精来保护幼虫的唯一的蝇类。In fact, it seems that most flies that eat rotting fruit use the alcohol defense against wasps.实际上,大部分的苍蝇都会食用腐烂水果,利用酒精来防御黄蜂。So fruit flies are not unique in this regard, but theyre still mighty impressive.所以果蝇在这方面并不独特,但它们仍然令人印象深刻。 /201311/265286襄阳四院阴道 襄阳第一人民医院地址

襄阳一医院电话号码襄樊男科医生 Most people assume that roosters are programmed to crow at the first sign of sunlight to announce the dawning of a new day, or some such romantic notion.大多数人都会认为每当第一缕阳光照耀大地,公鸡就会按规律打鸣表示崭新一天的开始。除此之外还有很多关于此浪漫的传说。Like all birds, roosters call in a daily cycle determined by circadian rhythms.和其他鸟类一样,公鸡每天打鸣的习惯是由生理节律所决定。That is, a roosters internal clock allows it to anticipate the sunrise and prepare for another exciting day of looking for food.公鸡的生物钟让它期待日出,以此为契机开始新一天的觅食。But why must roosters crow as they prepare to start their day, and why do some roosters sound off before dawn?但是,为什么公鸡会打鸣,而且这一时间点是在黎明前呢?Roosters are territorial creatures and dont much like other roosters trespassing on their land.公鸡是具有领地意识的动物,决不许其它公鸡侵犯自己的领地。They crow in order to establish their domain and warn other roosters to stay away or prepare to brawl.为了守护自己的地盘,警告其它公鸡远离进而避免争斗。And because their internal clocks are sometimes set a bit early, some roosters begin crowing well before sunrise.而且公鸡的生物钟有时候设置得早一些,所以有些公鸡是在日出前打鸣。201312/268617襄阳襄城妇幼保健院中医院医院男科

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