金陵十三钗
科学家将人类脑细胞植入大鼠体内并控制其行为_我的网站

A | 当谈到人体器官时,大脑和它们一样复杂,同样,它也是一个非常难以研究的对象。近年来,我们看到科学家在实验室培养的大脑器官方面取得了令人印象深刻的进展。这些干细胞开始接触生长因子,以刺激其成熟为不同类型的脑细胞,然后将其组装成类似于大脑中的三维结构。这不会产生意识,但确实为科学家提供了一个研究癫痫、自闭症、精神分裂症等疾病的模型,并研究不同药物的效果。 New Delhi, Oct 17 (UNI) Prime Minister Narendra Modi on Monday released the 12th instalment amount of Rs 16,000 crore to eligible farmers under the Pradhan Mantri Kisan Samman Nidhi (PM-KISAN) through Direct Benefit Transfer.
He inaugurated a two-day event 'PM Kisan Samman Sammelan' at Indian Agricultural Research Institute.
Addressing the gathering, the prime minister said, "I congratulate the farmers and their family members for having received the 12th installment today under Pradhan Mantri Kisan Samman Nidhi through Direct Benefit Transfer ahead of Deepawali."
Under the scheme, eligible farmer families are provided a benefit of Rs 6000 per year in three equal instalments of Rs 2,000 each.
So far, eligible farmer families have received benefits of more than Rs 2 lakh crore under PM-KISAN.
The Prime Minister termed the scheme a transformational initiative.
During the event, Modi also inaugurated 600 Pradan Mantri Kisan Samruddhi Kendras (PMKSK) under the Ministry of Chemicals and Fertilizers.
Under the scheme, the fertilizer retail shops in the country will be converted into Pradan Mantri Kisan Samruddhi Kendras in a phased manner.
Pradan Mantri Kisan Samruddhi Kendras will cater to a wide variety of needs of the farmers and provide agri-inputs (fertilizers, seeds, implements); testing facilities for soil, seeds, fertilizers; generate awareness among farmers; provide information regarding various government schemes and ensure regular capacity building of retailers at block and district level outlets, the PMO said.
More than 3 lakh retail fertilizer shops are planned to be converted into PMKSK.
"From today, the work will start to convert over 3.15 lakh fertilizer shops into Pradhan Mantri Samruddhi Kendras. These Kendras will be a one stop solution catering to all requirements of our annadatas," the Prime Minister said.
The Prime Minister also launched Bharat Urea Bags, which will help companies market fertilizers under the single brand name Bharat.
"Through One Nation One Fertilizer, urea will now be available under one brand name - Bharat. This will ensure farmers do not undergo confusion and there is consistency in the quality of fertilizers," the Prime Minister said.
The Prime Minister also inaugurated the Agri Startup Conclave and Exhibition.
About 300 startups will showcase their innovation related to Precision Farming, Post-Harvest and Value Add Solutions, Allied Agriculture, Waste to Wealth, Mechanisation for Small Farmers, Supply Chain Management, Argi-Logistic, among others.
The platform would facilitate startups to interact with farmers, FPOs, agri-experts, corporates etc. Startups will also share their experience and interact with other stakeholders in technical sessions.
During the event, Modi also launched ‘Indian Edge’, an e-magazine on fertilizer.
It will provide information on domestic and international fertilizer scenarios, including recent developments, price trends analysis, availability and consumption, success stories of farmers, among others.
UNI ASU SY。

B | 我们还看到了一些版本的脑器官,它们能够生长出自己的血管,发出电信号,甚至生长出能够感知光线的基本眼睛。去年,斯坦福大学医学院精神病学和行为科学教授Sergiu Pasca共同撰写了一份关于20个月大的实验室培养的大脑器官的研究。在这项工作之前,人们认为实验室培养的大脑没有能力成熟到相当于胎儿发育的阶段。这项研究证明,这些有机体可以像人脑一样成熟,遵循内部时钟,在与体内发育平行的时间轴上达到产后成熟度。虽然Pasca和该领域的其他人继续开发代表不同大脑区域的先进有机体,如大脑皮层,但在培养皿中研究这些结构有其局限性。Pasca说:“我们一直在使用有机体和它们的复杂组合在培养皿里制作越来越复杂的电路,称为组装体。

C | 但是,与你在自然发育的人类大脑中看到的情况相比,这些实验皿中的神经元在发育方面仍然落后。许多挑战--例如缺乏营养物质和生长因子、形成血管的内皮细胞或感觉输入--阻碍了实验皿中的发育。”在他们的最新工作中,Pasca和他的团队将类似于人类大脑皮层的大脑器官移植到近100只幼鼠体内。这些幼鼠两三天大,相当于人类的婴儿期,在这个阶段被植入,以便器官可以形成连接并与它们自己的大脑共同进化。不久之后,大鼠内皮细胞迁移到人体组织中,形成血管,为其提供营养和信号能力,以处理废物。

D | 大鼠大脑中的免疫细胞紧随其后,在移植的组织中自成一体。从那以后,植入的器官组织不仅存活下来,而且成长到占据了它们被植入的大鼠大脑半球的大约三分之一的位置。来自器官的单个神经元也迅速生长,在大鼠大脑中形成了与啮齿类动物天然大脑电路的连接,包括与丘脑区域的连接,该区域负责传递来自身体的感觉信息。Pasca表示:“这种连接可能为人类神经元的最佳成熟和整合提供了必要的信号。”科学家们随后将目光转向了疾病,利用来自蒂莫西综合症患者的皮肤细胞创建了一个类器官,蒂莫西综合症是一种与自闭症和癫痫有关的大脑疾病。这个类器官被移植到老鼠大脑的一侧,而由健康受试者的细胞创建的类器官被移植到另一侧作为对照。五到六个月后,这显示了电活动的明显差异,而蒂莫西综合症的神经元也小得多,并且具有较少的信号结构,称为树突。Pasca说:“通过研究保存在培养皿中的器官,我们已经了解了很多关于蒂莫西综合症的情况。但只有通过移植,我们才能看到这些与神经元活动有关的差异。”但最引人注目的发现来自于旨在衡量混合大脑处理感官信息能力的实验。将空气吹向大鼠的胡须,科学家们发现这使得人类的神经元有了电的反应。另一个实验涉及经过改造的器官,使其对蓝光作出反应,蓝光通过超薄光纤电缆施放。蓝光脉冲被用来激活这些神经元,只有在这些蓝光事件发生后,大鼠才能获得水。这发生在一个为期15天的"训练期",教导大鼠,这些神经元的激活意味着奖励即将到来,促使它们在期待中窜向水口。大鼠学会了将蓝光刺激与水的供应联系起来,这表明植入的人体组织可以作为大鼠大脑寻求奖励电路的一部分发挥作用。奥地利分子生物技术研究所科学主任Jürgen Knoblich博士说:“研究人员表明,人类神经元在被激活时,会干扰大鼠的行为,”他没有参与这项研究。“人类细胞在功能上与大鼠的大脑相连。

E | 这就是这项工作如此出色的原因。”Pasca将此描述为有史以来由人类皮肤细胞炮制的最先进的人类大脑电路,并说该平台是第一个在这种情况下为人类细胞提供行为读数的平台。由于能够控制和观察对大鼠行为的影响,该技术为研究神经精神疾病提供了令人兴奋的新机会。Pasca说:“我们现在可以研究健康的大脑发育以及被理解为在发育过程中扎根的大脑疾病,而不需要从人脑中切除组织,这是前所未有的细节。我们还可以利用这个新平台来测试治疗神经精神疾病的新药物和基因疗法。”这项研究发表在《自然》杂志上。
Current article:http://7hpy9b.caihezhehuagenshun.sbs/ajpjji/20260826/844898.html
Published on:21:15:08