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Vision,not limbs,led fish onto land 385 million years ago
Vision not limbs led fish onto land 385 million years ago
2017/3/30
EVANSTON - A provocative new Northwestern University and Claremont McKenna, Scripps and Pitzer colleges study suggests it was the power of the eyes and not the limbs that first led our ancient aquatic...
Paleontologists find fossil relative of Ginkgo biloba
Paleontologists fossil relative Ginkgo biloba
2017/3/14
A discovery of well-preserved fossil plants by paleontologists from the United States, China, Japan, Russia and Mongolia has allowed researchers to identify a distant relative of the living plant ...
Evidence disproving tropical ‘thermostat’ theory:global warming can breach limits for life
disproving tropical thermostat theory global warming breach limits for life
2017/3/14
New research findings show that as the world warmed millions of years ago, conditions in the tropics may have made it so hot some organisms couldn’t survive.Longstanding theories dating to the 1980s s...
Old Rocks,Biased Data:Overcoming Challenges Studying the Geodynamo
Old Rocks Biased Data Overcoming Challenges Studying Geodynamo
2017/3/13
Gleaning data from old rocks may result in bias. Now, geophysicists have a way to improve their methods to overcome challenges in studying the history of the Earth's core and magnetic field that make ...
多学科整合方法揭示鸟类重要特征演化(图)
多学科整合方法 鸟类 特征演化
2017/2/13
2017年2月6日, 国家基因库生物多样性基因组学团队、日本东北大学、东京大学等单位的科学家们共同揭开鸟类特有性状的形成及宏观演化之谜——特异性保守序列对鸟类特有性状的宏观演化起到重要作用。此项关于鸟类基因组特异性保守序列 (avian-specific highly conserved elements, ASHCEs) 的研究成果在Nature Communications上发表。古脊椎所徐星...
我国科学家发现5.35亿年前毫米级微型人类远祖至亲(图)
毫米级人类 微型动物化石
2017/2/14
英国《自然》(Nature)杂志当地时间2017年1月30日以封面亮点文章的形式,网上发表了西北大学早期生命研究团队韩健、舒德干和剑桥大学、中国地质大学(北京)等单位关于早期生命研究的又一重要成果——《陕西寒武纪最早期的微型后口动物》。该成果发现了5.35亿年前最古老的原始后口动物——冠状皱囊动物。这种奇特的毫米级微型动物很可能就是学术界期盼已久的后口动物亚界的一个根,因而代表着显生宙最早期的毫米...
Prized fossil find illuminates the lives of lizards in the Age of Dinosaurs
illuminates the lives lizards Age of Dinosaurs
2017/2/16
Paleontologists picking through a bounty of fossils from Montana have discovered something unexpected — a new species of lizard from the late dinosaur era, whose closest relatives roamed in faraw...
New Technique Quickly Predicts Salt Marsh Vulnerability
New Technique Quickly Predicts Salt Marsh Vulnerability
2017/2/16
Scientists working on a rapid assessment technique for determining which US coastal salt marshes are most imperiled by erosion were surprised to find that all eight of the Atlantic and Pacific Coast m...
Sequence data of biomolecules such as DNA and proteins, which provide critical information for evolutionary studies, have been assumed to be forever outside the reach of dinosaur paleontology. Protein...
新型添加剂使钙钛矿LED更稳定高效
钙钛矿 LED 光子学 矿物学
2017/1/19
在2017年1月16日出版的《自然·光子学》杂志上,美国普林斯顿大学研究人员发表论文称,他们开发出一种新技术,通过添加有机卤化铵,制造出了成本更低、效率更高且性能更稳定的钙钛矿发光二极管(LED)。过去10年来,LED的应用越来越广,其节能、环保、寿命长、体积小,但制造成本也相对较高,降低LED制造成本是相关产业界的重要目标。钙钛矿算是一种古老的材料,1839年首次发现于俄罗斯乌拉尔山脉,因俄罗斯...
最新研究表明植物化石燃料促使地球寒武纪生命大爆发(图)
植物 石燃料 地球寒武纪生命
2017/1/17
最新一项研究表明,植物化石燃料阻止更多碳与大气层中的氧气结合形成二氧化碳,导致大气层中氧气指数升高,促使5.41亿年前寒武纪生命大爆发。图中是黑色页岩形成于4.5亿的前,包含着三叶虫和有机物质化石,该化石表明当时地球大气氧气含量升高。
恐龙蛋的孵化期可达数月——可能更类似爬行动物而不是鸟类(图)
恐龙蛋 孵化期 爬行动物 鸟类
2017/1/17
美国和加拿大研究人员2日说,他们发现一些恐龙蛋的孵化期可达数月,这意味着恐龙蛋的孵化时间可能更类似爬行动物,而不是此前认为的鸟类。负责研究的美国佛罗里达州立大学教授格雷戈里•埃里克森在一份声明中说,关于恐龙最大的谜团之一就是它的胚胎发育,而“我们对此几乎一无所知”。由于鸟类被视为“活着的恐龙”,科学家一直认为,恐龙蛋的孵化期接近鸟类,即11至85天。
史前日本墓穴表明狗仍然是远古人类最好的狩猎伙伴(图)
史前日本墓穴 狗 远古人类 狩猎伙伴
2017/1/17
《科学》杂志官网近期刊登了该杂志在线新闻编辑大卫·格里姆(David Grimm)的一篇题为《史前日本墓穴表明狗仍然是远古人类最好的狩猎伙伴》(Prehistoric Japanese graves provide best evidence yet that dogs were our ancient hunting companions)的文章。该文章表示,家犬可能是远古时期人们的狩猎伙伴,不...
South American fossil tomatillos show nightshades evolved earlier than thought
South American fossil tomatillos nightshades evolved earlier
2017/2/15
Delicate fossil remains of tomatillos found in Patagonia, Argentina, show that this branch of the economically important family that also includes potatoes, peppers, tobacco, petunias and tomatoes exi...
Holidaymakers concerned about fresh volcanic eruptions causing flight-disrupting ash clouds might be reassured by a study setting out the first reliable estimates of their frequency.While the Universi...