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水道残留的抗焦虑药物改变野生鲑鱼的迁徙行为
#科学

据一项新的研究披露,在全球水道中被广泛检测到的抗焦虑药物氯巴占(clobazam)正在改变野生大西洋鲑鱼的迁徙行为。这些发现凸显了药物污染所致的生态后果无远弗届,揭示了即使痕量的精神活性药物也能破坏野生动物的基本生存行为。药物污染(尤其是水道中的污染)是一个日趋严重的环境问题,其对生物多样性、生态系统功能和公共健康皆构成重大威胁。目前,包括南极在内的全球水体中已检测到 900 多种活性药物或其衍生物。它们会长期存在于环境中:即使是痕量的精神药物(如抗抑郁药和抗焦虑药)已被证实能通过作用于神经通路而改变动物行为。研究人员发现,抗焦虑药物氯巴占会在接触该污染物的鲑鱼脑中积累,从而改变鲑鱼穿过水坝通道的能力以及从河流到海洋的整体迁徙成功率。接触氯巴占会增加到达海洋的幼鲑数量,这可能源于氯巴占增强了鲑鱼甘冒风险的倾向并降低了其结伴群聚的行为。虽然鲑鱼的整体迁徙速度没有显著变化,但接触污染物的幼鱼穿过水电站大坝的速度加快,表明冒险行为的增加使其穿越障碍物的速度得到提升。实验室中的实验显示,氯巴占会降低水中动物结群行动的凝聚力(尤其在捕食者存在时),因而可能增加其在野外被捕食的风险。
Science DOI 10.1126/science.adp7174
EurekAlert:精神活性药物污染会改变野生鲑鱼的迁徙行为



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水道残留的抗焦虑药物改变野生鲑鱼的迁徙行为
#科学

据一项新的研究披露,在全球水道中被广泛检测到的抗焦虑药物氯巴占(clobazam)正在改变野生大西洋鲑鱼的迁徙行为。这些发现凸显了药物污染所致的生态后果无远弗届,揭示了即使痕量的精神活性药物也能破坏野生动物的基本生存行为。药物污染(尤其是水道中的污染)是一个日趋严重的环境问题,其对生物多样性、生态系统功能和公共健康皆构成重大威胁。目前,包括南极在内的全球水体中已检测到 900 多种活性药物或其衍生物。它们会长期存在于环境中:即使是痕量的精神药物(如抗抑郁药和抗焦虑药)已被证实能通过作用于神经通路而改变动物行为。研究人员发现,抗焦虑药物氯巴占会在接触该污染物的鲑鱼脑中积累,从而改变鲑鱼穿过水坝通道的能力以及从河流到海洋的整体迁徙成功率。接触氯巴占会增加到达海洋的幼鲑数量,这可能源于氯巴占增强了鲑鱼甘冒风险的倾向并降低了其结伴群聚的行为。虽然鲑鱼的整体迁徙速度没有显著变化,但接触污染物的幼鱼穿过水电站大坝的速度加快,表明冒险行为的增加使其穿越障碍物的速度得到提升。实验室中的实验显示,氯巴占会降低水中动物结群行动的凝聚力(尤其在捕食者存在时),因而可能增加其在野外被捕食的风险。
Science DOI 10.1126/science.adp7174
EurekAlert:精神活性药物污染会改变野生鲑鱼的迁徙行为

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Should You Buy Bitcoin?

In general, many financial experts support their clients’ desire to buy cryptocurrency, but they don’t recommend it unless clients express interest. “The biggest concern for us is if someone wants to invest in crypto and the investment they choose doesn’t do well, and then all of a sudden they can’t send their kids to college,” says Ian Harvey, a certified financial planner (CFP) in New York City. “Then it wasn’t worth the risk.” The speculative nature of cryptocurrency leads some planners to recommend it for clients’ “side” investments. “Some call it a Vegas account,” says Scott Hammel, a CFP in Dallas. “Let’s keep this away from our real long-term perspective, make sure it doesn’t become too large a portion of your portfolio.” In a very real sense, Bitcoin is like a single stock, and advisors wouldn’t recommend putting a sizable part of your portfolio into any one company. At most, planners suggest putting no more than 1% to 10% into Bitcoin if you’re passionate about it. “If it was one stock, you would never allocate any significant portion of your portfolio to it,” Hammel says.

At a time when the Indian stock market is peaking and has rallied immensely compared to global markets, there are companies that have not performed in the last 10 years. These are definitely a minor portion of the market considering there are hundreds of stocks that have turned multibagger since 2020. What went wrong with these stocks? Reasons vary from corporate governance, sectoral weakness, company specific and so on. But the more important question is, are these stocks worth buying?

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