Naucni radovi zanimljivi za siru javnost

[Indy]

Nasli su da su se Indijci miksovali sa Aboridzinima pre otprilike 4000 godina. Pise i BBC.

Genome-wide data substantiate Holocene gene flow from India to Australia

1. Irina Pugach a,1,
2. Frederick Delfin a,b,
3. Ellen Gunnarsdóttir a,c,
4. Manfred Kayser d, and
5. Mark Stoneking a

Author Affiliations

1. Edited by James O’Connell, University of Utah, Salt Lake City, UT, and approved November 27, 2012 (received for review July 21, 2012)

AbstractThe Australian continent holds some of the earliest archaeological evidence for the expansion of modern humans out of Africa, with initial occupation at least 40,000 y ago. It is commonly assumed that Australia remained largely isolated following initial colonization, but the genetic history of Australians has not been explored in detail to address this issue. Here, we analyze large-scale genotyping data from aboriginal Australians, New Guineans, island Southeast Asians and Indians. We find an ancient association between Australia, New Guinea, and the Mamanwa (a Negrito group from the Philippines), with divergence times for these groups estimated at 36,000 y ago, and supporting the view that these populations represent the descendants of an early “southern route” migration out of Africa, whereas other populations in the region arrived later by a separate dispersal. We also detect a signal indicative of substantial gene flow between the Indian populations and Australia well before European contact, contrary to the prevailing view that there was no contact between Australia and the rest of the world. We estimate this gene flow to have occurred during the Holocene, 4,230 y ago. This is also approximately when changes in tool technology, food processing, and the dingo appear in the Australian archaeological record, suggesting that these may be related to the migration from India.

Edited January 15, 2013 by Indy

[dekss]

Da li su ljudi po prirodi dobri ili zli?

[Indy]

Mozda od znacaja za rasprave na temu vegetarijanstva. Ili ribolova. (Kome treba pdf, nek viche.)Can fish really feel pain?J D Rose 1, R Arlinghaus 2,3, S J Cooke 4,*, B K Diggles 5, W Sawynok 6, E D Stevens 7, C D L Wynne 8Article first published online: 20 DEC 2012 DOI: 10.1111/faf.12010Fish and FisheriesAbstractWe review studies claiming that fish feel pain and find deficiencies in the methods used for pain identification, particularly for distinguishing unconscious detection of injurious stimuli (nociception) from conscious pain. Results were also frequently misinterpreted and not replicable, so claims that fish feel pain remain unsubstantiated. Comparable problems exist in studies of invertebrates. In contrast, an extensive literature involving surgeries with fishes shows normal feeding and activity immediately or soon after surgery. C fiber nociceptors, the most prevalent type in mammals and responsible for excruciating pain in humans, are rare in teleosts and absent in elasmobranchs studied to date. A-delta nociceptors, not yet found in elasmobranchs, but relatively common in teleosts, likely serve rapid, less noxious injury signaling, triggering escape and avoidance responses. Clearly, fishes have survived well without the full range of nociception typical of humans or other mammals, a circumstance according well with the absence of the specialized cortical regions necessary for pain in humans. We evaluate recent claims for consciousness in fishes, but find these claims lack adequate supporting evidence, neurological feasibility, or the likelihood that consciousness would be adaptive. Even if fishes were conscious, it is unwarranted to assume that they possess a human-like capacity for pain. Overall, the behavioral and neurobiological evidence reviewed shows fish responses to nociceptive stimuli are limited and fishes are unlikely to experience pain.

Edited January 19, 2013 by Indy

[Indy]

Bosses recover from rejection faster at work and home.Researchers from the University of California: Berkeley conducted five experiments examining power dynamics at work and in relationships, focusing on how power influences responses to rejection.At work, subordinates reported lower self-esteem and greater negative emotions, while supervisors showed no adverse reaction to rejection.At home, those who perceived themselves as less powerful were less positive and engaged while dominant partners were more upbeat and worked harder at connecting with their mates.

[lostfanforever]

malo (krajnje) personalizovane medicine i nauke. a sta ce biti vas finalni experiment ? :)http://www.nytimes.com/2012/12/23/magazine/is-the-cure-for-cancer-inside-you.html?smid=fb-share&_r=0

[betty]

Why Even Radiologists Can Miss A Gorilla Hiding In Plain Sight

[spina]

http://www.plosone.org/article/info%3Adoi%2F10.1371%2Fjournal.pone.0054608zanimljivost za velike srbe :)

[Indy]

Caffeine Improves Memory in BeesAfter a long day buzzing between flowers, even the most industrious worker bee could use a little help remembering which ones she wants to return to the next day. Some plants have a trick to ensure they end up at the top of the list: caffeinated nectar. A team of researchers bombarded honey bees with floral smells paired with sugary rewards, some of which contained the same levels of caffeine found in the nectar of coffee and citrus flowers (pictured). Three times as many bees remembered the odors associated with caffeine after 24 hours, when compared with the scents associated with sugar alone, the team reports online today in Science. When the researchers applied the stimulant directly to honey bee brains, it had a positive effect on the neurons associated with the formation of long term memories. Now, they want to see if bees go out of their way to feed on caffeinated nectar, perhaps even ignoring predators to do so—behavior that, if observed, could shed light on the neurological processes behind addiction.

[Indy]

Srce i pluća mogu da omirišu hranu

[Skyhighatrist]

Izasao Nasa Spinoff 2012 (jos u februaru doduse)

[Indy]

Dokazano da zene smatraju velicinu pjenisa bitnom (ne znam za koga je ovo novost, ali evo citam u naucnim novostima).

[Zaz_pi]

greska...

Edited April 14, 2013 by Zaz_pi

[Indy]

Lomeca™ vest: klonirani ljucki embrioni!

[Quince]

Dokazano da zene smatraju velicinu pjenisa bitnom (ne znam za koga je ovo novost, ali evo citam u naucnim novostima).

"We thought it's kind of strange that there's so little done on human penis size and it's such a topic of popular conversation," he says.

[Indy]

Може бити занимљиво и ширем аудиторијуму - сад сам први пут наишао на ово, припремајући 1 есеј.Wine or Raki - The Interplay of Climate and Society in Early Modern Ottoman BosniaОво је рад Јелене Мргић, коју можда неко са форума и познаје (Б. У. је у питању). Мени је текст (који још нисам стигао детаљно да ишчитам) препун занимљивости, просто не знам шта бих издвојио. Ево само нешто из Закључка.The cooler and wetter climate conditions in Ottoman Bosnia during the 1580s and 1590s corresponded with the climatic trends recorded in Hungary and Central Europe during the LIA. This paper highlights the adaptive strategies that Bosnian farmers were compelled to apply when faced with climate deterioration. As evidenced by the Ottoman tax registers, their strategies were quite similar to those of other well-researched regions and included minimising wheat and grape harvest failures by abandoning winegrowing and increasing the production of more climate-resistant crops: barley, spelt wheat, and oats. To compensate for the loss of income, Christian farmers partly turned to pig rearing and itinerant trade. At about the same time, the production of the distilled alcohol beverage – rakı or brandy – became widespread in the Northern Balkans. As well as wine spirits, which were probably the first distilled drinks, the paper presents new evidence of increasing plum brandy (šljivovica) production, trade and popular consumption, from the late sixteenth century onward. This fact can also be brought into connection with climatic change, because plums have a greater biological ability to survive climate cooling than grapes, are less demanding in terms of labour input and have greater nutritional value.However, this paper observes climate change only as the initial step in the process of social and cultural changes, which evolved within a range of further impacts, such as the biophysical, demographic and economic. ...