Držitelka Nobelovy ceny za biologii Frances Arnoldová stáhla jeden vědecký článek, u kterého je uvedena jako vedoucí autorka. Americká bioložka veřejně upozornila na chybu ve své práci a požádala o její stažení z prestižního časopisu. Jde o ukázku toho, jak bojovat s problémem zvaným replikační krize.
The small hopping insect Issus coleoptratus uses toothed gears on its joints to precisely synchronize the kicks of its hind legs as it jumps forward
New maps that use information from the Copernicus Sentinel-5P satellite reveal emissions of nitrogen dioxide along a Siberian natural gas pipeline that connects the Urengoy gas field – the second-largest gas field in the world – with Europe.
Henrietta Lacks (born Loretta Pleasant; August 1, 1920 – October 4, 1951) was an African-American woman whose cancer cells are the source of the HeLa cell line, the first immortalized cell line and one of the most important cell lines in medical research. An immortalized cell line reproduces indefinitely under specific conditions, and the HeLa cell line continues to be a source of invaluable medical data to the present day.Lacks was the unwitting source of these cells from a tumor biopsied during treatment for cervical cancer at Johns Hopkins Hospital in Baltimore, Maryland, U.S., in 1951. These cells were then cultured by George Otto Gey who created the cell line known as HeLa, which is still used for medical research. As was then the practice, no consent was obtained to culture her cells, nor were she or her family compensated for their extraction or use. Lacks grew up in rural Virginia. After giving birth to two of their children, she married her cousin David "Day" Lacks. In 1941 the young family moved to Turner Station, near Dundalk, Maryland, in Baltimore County, so Day could work in Bethlehem Steel at Sparrows Point...
How Building a Black Hole for Interstellar Led to an Amazing Scientific Discovery
Jak vznikala polární stanice na ostrově Jamese Rosse? Výroční přednáška Pavla Proška bude 22. února.
Objective: To find out whether taking images of the male and female genitals during coitus is feasible and to find out whether former and current ideas about the anatomy during sexual intercourse and during female sexual arousal are based on assumptions or on facts. Design: Observational study. Setting: University hospital in the Netherlands. Methods: Magnetic resonance imaging was used to study the female sexual response and the male and female genitals during coitus. Thirteen experiments were performed with eight couples and three single women. Results: The images obtained showed that during intercourse in the “missionary position” the penis has the shape of a boomerang and 1/3 of its length consists of the root of the penis. During female sexual arousal without intercourse the uterus was raised and the anterior vaginal wall lengthened. The size of the uterus did not increase during sexual arousal. Conclusion: Taking magnetic resonance images of the male and female genitals during coitus is feasible and contributes to understanding of anatomy.
The burial detail, which had come for the corpses in the pigpen, was surprised. The “dead” were getting up and speaking English.…
They colored it like a paint-by-numbers picture.
What Causes the Smell of New & Old Books?
Minulý týden, několik dnů před svými třináctými narozeninami, dokončil Jackson Oswalt z Memphisu v Tennessee stavbu zařízení, v němž probíhá jaderná fúze. Jádra atomů deuteria se tam slučují, mění se na helium a uvolňují energii.
Not to put too fine a point on it, but what the frak is 'Oumuamua?
Is it possible to hear radio broadcasts through your teeth?
Snakes and Ladders can be analyzed by converting it to a Markov Chain
Since its inception in the 1950s, radiocarbon dating has proven indispensable to archaeologists and climate scientists, who rely on the technique to accurately date organic compounds. But a good thing just got better, owing to the discovery of two stalagmites in a Chinese cave containing a seamless chronological atmospheric record dating back to the last Ice Age.
Jedná se o zvuk po desetiletí provázející většinu vyrobených automobilů. Když zařadíte zpátečku a rozjedete se, začne se z převodovky ozývat „kňučení“. Drtivá většina má tento zvuk zažitý jako normální jev, ale jen málokdo ví, proč vlastně auta při jízdě dozadu takhle kňourá. Co se tedy skrývá za odvěkou záhadou?
The astonishing story of Nick Brown, the British man who began a part-time psychology course in his 50s – and ended up taking on America's academic establishment
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