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Collapse of desert bird populations likely due to heat stress from climate change(图)
Collapse bird populations due heat stress climate change
2019/10/17
As temperatures rise, desert birds need more water to cool off. At the same time, deserts are becoming drier, setting some species up for a severe crash, if not extinction, according to a new study pu...
New study finds U.S. and Canada have lost more than 1 in 4 birds in past 50 years(图)
U.S. Canada lost birds past 50 years
2019/10/18
Since 1970, bird populations in the U.S. and Canada have declined by 29%, or almost 3 billion birds, signaling a widespread ecological crisis, a study published in the journal Science reveals. The res...
动物研究显示青春期社交隔离会导致大脑发育异常
动物研究 青春期 社交隔离 大脑发育
2019/10/11
美国一项新研究发现,雌性小鼠如果在青春期被隔离起来,它们大脑中的前额叶皮质会出现非典型发育,并在成年后产生对一些习惯性行为的过度依赖,这种依赖被认为与上瘾行为和肥胖等相关。大脑中的神经元通过突触形成各种神经网络,突触位于神经细胞表面的树突棘上,是脑部信息传递的结构基础。在大脑发育的头几年,树突棘大量产生,之后经过外界刺激和学习的不断“修剪”,最终形成神经网络。
Using artificial intelligence to track birds' dark-of-night migrations(图)
artificial intelligence track birds dark-of-night migrations
2019/10/18
Every year during spring and fall migration, tens of millions of birds take flight at sunset and pass over our heads, unseen in the night sky.The National Weather Service has recorded the birds' migra...
生物谷震惊!日本首次批准在动物身上种植人体器官!(图)
诱导多能干细胞 胰腺被移植 糖尿病 胚胎发育
2022/3/3
这项前沿但颇有争议的研究涉及将人类"诱导多能干细胞"(ips)植入修改过的动物胚胎中,诱导多能干细胞可以被诱导形成身体任何部位的构建模块。
2019年8月15日,来自美国Stowers研究所的Alejandro Sánchez Alvarado团队在Nature上发表文章Wnt and TGFβ coordinate growth and patterning to regulate size-dependent behavior,揭示了Wnt和TGFβ信号通路如何协调生长和模式化进而调控涡虫大小与横裂生殖行为的具体机制。
New insights into genetic basis of bird migration(图)
New insights genetic basis bird migration
2019/10/18
A gene associated with the migratory patterns of golden-winged and blue-winged warblers could lend insight into the longstanding question of how birds migrate across long distances.A new study led by ...
首次用于爬行动物 基因编辑技术制造出白化蜥蜴(图)
爬行动物 基因编辑技术 白化蜥蜴;
2022/3/3
据英国《独立报》27日报道,美国科学家借助基因编辑技术CRISPR-Cas9,制造出了第一种经过基因编辑的爬行动物——一些小型白化蜥蜴,这是该技术首次用于爬行动物。由于白化病患者经常有视力问题,因此,最新突破有助于研究基因缺失如何影响视网膜发育。
性别或可在出生前选择 动物实验首次将“雌雄精子”分开
性别 动物实验 雌雄精子 分开
2019/8/19
据美国《新闻周刊》网站近日报道,日本科学家在携带X染色体的老鼠精子中发现了一种X染色体蛋白,并将其与携带Y染色体的生殖细胞分离开来,他们用这一技术创造了一窝主要由一种性别组成的小鼠。他们表示,最新研究未来可能对包括人类在内的动物性别选择产生巨大影响。
Scent brings songbirds to the yard(图)
Scent songbirds yard
2019/10/21
Chickadees are interested in scents. That's the news from a study out of Lehigh University, the first to document naturally hybridizing songbirds' preference for the smell of their own species.Amber R...
据《Nature》杂志报道,日本科学部的一个委员会批准了东京大学研究人员提出的在大鼠或小鼠体内培养人类胰腺的一项研究计划。
科学家发现了肝脏具有独特的昼夜节律调节功能(图)
肝脏 昼夜节律调节功能 生物钟
2019/7/17
近日,美国加利福尼亚大学等科研机构的科研人员在Cell上发表了题为“Defining the Independence of the Liver Circadian Clock”的文章,发现了肝脏具有独特的昼夜节律调节功能。哺乳动物依靠生物钟网络控制日常的全身代谢和生理活动。下丘脑视交叉上核(suprachiasmatic nucleus,SCN)是哺乳动物昼夜节律调节系统的中枢结构,SCN的中心...
近日,加利福尼亚大学等科研人员在Nature Cell Biology上发表了题为“Mitochondrial fusion regulates lipid homeostasis and stem cell maintenance in the Drosophila testis”的文章,发现果蝇睾丸通过线粒体融合调节脂质稳态和干细胞维持。
Model predicts bat species with potential to spread Nipah virus(图)
Model predicts bat species potential spread Nipah virus
2019/10/23
Since its discovery in 1999, Nipah virus has been reported almost yearly in Southeast Asia, with Bangladesh and India the hardest hit. In a new study, published in PLOS Neglected Tropical Diseases, sc...
New sea slug species discovered near condominiums of Florida’s Cedar Key(图)
sea slug New species near condominiums Florida Cedar Key
2019/10/28
Feet from the raw bars and seashell-colored condominiums of Florida's Cedar Key, NSF-supported researchers at the Florida Museum of Natural History and California State University discovered a new spe...