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Scientists Reveal How Mosquitoes Are Able to Smell Humans Even Without Antennae_我的网站

一 |     本篇评级为★★★，主要围绕以下内容展开：                    1. 资金拉锯战，波动期仍需提防一类风险；          2. 海外频现电力事故，暗含哪些投资机会?                    如有疑问请以音频内容为准，添加妙投小虎哥微信miaotou515，入群有机会与董小姐进一步交流。    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。                   新闻解读评级说明：五星重磅，四星重要，三星级以下大家选择听。                   1. 资金拉锯战，波动期仍需提防一类风险          今天国内A股市场陷入了资金“拔河”的僵局。一方面，国家队仍处于暂停节奏，未继续大面积增持ETF基金；另一方面，前期大幅流出的个人投资者或杠杆资金也开始犹豫。

二 | 最具代表性的指标是融资融券中的融资余额，已连续两天呈个位数变化，不再像前两天那样大幅抛售。无论是托底资金还是试图落袋为安的资金，目前都陷入了观望状态。                   偶尔虽有国有资金机构发声打气（如北京国有资本运营管理公司表示已投入近百亿布局A股），但这属于此前已投入的弹药，并不意味着未来有同等规模的增量预期，因此对市场的作用并非决定性。

三 | 这种僵局直接反映在成交量上：今天沪深两市成交额仅为2.2万亿，说明多空双方都不太敢轻举妄动。打破僵局可能需要等待下一个重磅级利好或黑天鹅事件。在当前脆弱的稳定期，适度保持谨慎、观望是比较明智的选择。                   本文为妙投付费内容，上述仅为摘要，购买本专栏即可解锁完整内容。新用户可免费领本专栏7天阅读体验机会，在妙投APP-我的-权益兑换 输入“妙投888”即可领取。

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