一 | 视频加载中...极目新闻记者 谢茂1月12日，成都金堂县失联的19岁女大学生姜某某遗体被发现，她失联已有12天。此前张贴的寻人启事极目新闻此前报道，姜某某于2024年12月31日晚在成都金堂县白果大桥桥头下车后，下落不明。金堂县公安局1月9日发布警情通报称，调查发现，姜某某于2024年12月31日18时40分许从学校门口搭乘网约车，19时25分许在白果大桥桥头下车，21时50分许从附近的顺江街向沱江边走去，随后进入监控盲区，失去踪迹。 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。1月12日，姜某某的亲属在社交平台更新了寻找姜某某的进展，称姜某某遗体被打捞上岸。此前搜救现场（受访者供图）1月12日，一位曾在现场帮忙搜救的市民向极目新闻记者介绍，近几日他在现场看到不少救援人员在搜救，其中金堂县水城救援队还用上了声呐和水下机器人。
二 | 1月12日，河中发现了姜某某的遗体，并已打捞上岸，“非常遗憾。”金堂县警方也向记者证实，在事发水域打捞上一具遗体，详细身份信息还在进行医学鉴定。（来源：极目新闻）更多精彩资讯请在应用市场下载“极目新闻”客户端，未经授权请勿转载，欢迎提供新闻线索，一经采纳即付报酬。24小时报料热线027-86777777。
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