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热议！詹姆斯23年生涯从未申请交易 美记：世人鲜少将忠诚与他挂钩_我的网站

A |     Mosquitoes use the body odor, heat, and carbon dioxide that humans emit, varying from person to person, to find their next meal. The study, which was published in the scientific journal Cell, reveals that mosquitoes may perceive odors via a variety of distinct pathways, in contrast to animals, which have a single set of neurons that detect each sort of odor.,Female mosquitoes use the variety of odors that people and other animals produce to find the blood that will feed their eggs. The olfactory neurons in the insects' antennae, which are where they take up scents, detect and send scent information to the brain.,Groups of human-odor receptors on the olfactory neurons in the antennae of female mosquitoes (Aedes aegypti) were rendered inactive by the study's lead author Meg Younger and her colleagues at Boston University in Massachusetts using the gene editing tool CRISPR.,"We found that there’s a real difference in the way mosquitoes encode the odors that they encounter compared to what we’ve learned from other animals,” Younger is quoted as saying in the Guardian report on the findings.,According to Younger, the scientists believed that mosquitoes would adhere to the core tenet of olfaction, which states that each neuron expresses only one type of receptor.,“Instead, what we’ve seen is that different receptors can respond to different odors in the same neuron," she added.,This reportedly suggests that mosquitoes can still detect human odors after losing one or more receptors. The researchers asserted that this backup system may have developed as a survival mechanism.,"The mosquito Aedes aegypti is specialized to bite humans, and it is believed that they evolved to do that because humans are always close to fresh water and mosquitoes lay their eggs in fresh water. We are basically the perfect meal, so the drive to find humans is extremely strong," Younger explained,In the end, the researchers argued, knowing how the mosquito brain perceives human odor could be used to influence biting behavior and stop the spread of diseases like malaria, dengue fever, and yellow fever that are transmitted by those insects.,"One major strategy for controlling mosquitoes is to attract them to traps to remove them from the biting population. If we could use this knowledge to understand how human odor is represented in the mosquito antennae and brain, we could develop blends that are more attractive to mosquitoes than we are. We could also develop repellants that target those receptors and neurons that detect human odor," Younger concluded.,Notably, Christopher Potter at Johns Hopkins School of Medicine in Maryland recently found a similar phenomenon in fruit flies, or Drosophila melanogaster.,“If one of these types of olfactory receptors is mutated or no longer functioning, there’s this backup system," Potter is quoted as saying in the New Scientist report. “It’s changing the dogma of what we thought we knew about the olfactory system.”,Science & TechSmell of Blood: Mosquitoes' Scent-Based Host-Seeking Mechanism Revealed16 May, 05:54 GMT。    北京时间8月11日，41岁的詹姆斯已经在NBA打了23个赛季，新赛季他将身穿76人23号战袍开启生涯第24年；据统计，詹姆斯生涯至今从未主动申请交易，美记者直言：世人却很少将忠诚与他挂钩。         美记者Damien Peters发推评价了詹姆斯，他写道：勒布朗·詹姆斯是NBA历史上征战赛季最多的球员。然而在这漫长的23载岁月中，他从未主动提出过交易申请。每一份合同皆善始善终，每一项义务皆恪尽己责。但世人鲜少将‘忠诚’二字与他挂钩，当你白纸黑字签下的每一份合约都逐一兑现时，这份坚守又该作何衡量？          众所周知，NBA是一个商业联盟，很多球星都曾遭遇被球队无情交易的命运，但球星申请离队却常常被视为不忠诚，这一现象太双标。         生涯至今，詹姆斯已经签过11份合同，每一次都是拒绝球员选项或者在合同到期后离开球队，今夏詹姆斯则是以自由球员的身份离开湖人，最终与76人签下2年800万美元的底薪合同。         新赛季詹姆斯父子将分别为76人和湖人效力，从队友变成对手，未来有望同场对决；近日老詹在节目中表示：我有一个快22岁的儿子，他现在是我前队友，这太搞笑了。         究竟新赛季的詹姆斯能在76人打出怎样的表现以及能否携手恩比德、马克西和布朗如愿夺冠？拭目以待吧。

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Published on:04:07:11