skipped back 40
Piektdiena, 11. Feb 2005, 18:04
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pzrk:
Trešdiena, 9. Feb 2005, 18:24
divi_g:
Mēs visi, kopā ar Piena ceļu, kā izrādās, riņķojam ap melno caurumu.
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Otrdiena, 25. Jan 2005, 10:03
divi_g:
Iespējams, noskaidrots, kā tas gadījies, ka cilvēkam ir attīstījušās lielas smadzenes. Ģenētiskas mutācijas dēļ mūsu organisms neražo vietu, kas varētu būt traumējoša nervu centriem:
(...) Ajit Varki of UCSD led the research that established that Neu5GC is missing from humans. (...) Varki also points out that the elimination of Neu5Gc might have been particularly important for the hominid brain--which, perhaps not coincidentally--went through a huge expansion roughly around the time that the Neu5Ac mutation occurred. In other animals, Neu5Gc is abundant on the cells of most organs, but exceedingly rare in the brain. It is very peculiar for a gene to be silenced in the brain, which suggests that it might have some sort of harmful effect. Once a mutation knocked out the gene altogether, hominids didn't have to suffer with any Neu5Gc in the brain at all. Perhaps Neu5Gc limited brain expansion in other mammals, but once it was gone from our ancestors, our brains exploded.
Viss raksts angliski (garš).
(...) Ajit Varki of UCSD led the research that established that Neu5GC is missing from humans. (...) Varki also points out that the elimination of Neu5Gc might have been particularly important for the hominid brain--which, perhaps not coincidentally--went through a huge expansion roughly around the time that the Neu5Ac mutation occurred. In other animals, Neu5Gc is abundant on the cells of most organs, but exceedingly rare in the brain. It is very peculiar for a gene to be silenced in the brain, which suggests that it might have some sort of harmful effect. Once a mutation knocked out the gene altogether, hominids didn't have to suffer with any Neu5Gc in the brain at all. Perhaps Neu5Gc limited brain expansion in other mammals, but once it was gone from our ancestors, our brains exploded.
Viss raksts angliski (garš).
Ceturtdiena, 20. Jan 2005, 08:41
divi_g:
Pretēji tam, kā domājām iepriekš, dinozauru ēras ziedu laikos zīdītāji nevis slēpušies no ļaunajiem dinozauriem, bet paši medījuši tos:
Named Repenomamus giganticus and Repenomamus robustus, the sturdily built mammals lived in China about 130 million years ago, around 65 million years before we thought their kind inherited the Earth. At 1 metre long, R. giganticus was big enough to hunt small dinosaurs, and a newly discovered fossil of its smaller cousin, R. robustus, died with its belly full of young dinosaur.
Sīkāk šeit.
Named Repenomamus giganticus and Repenomamus robustus, the sturdily built mammals lived in China about 130 million years ago, around 65 million years before we thought their kind inherited the Earth. At 1 metre long, R. giganticus was big enough to hunt small dinosaurs, and a newly discovered fossil of its smaller cousin, R. robustus, died with its belly full of young dinosaur.
Sīkāk šeit.
Otrdiena, 18. Jan 2005, 09:30
divi_g: Es, robots
Amerikāņu profesors sekojis Azimova pēdās un formulējis vairākas ētiskas problēmas, kas sagaidāmas līdz ar robotehnikas attīstību. Imho interesanti. Lasīt šeit.
Pirmdiena, 17. Jan 2005, 20:44
divi_g:
"Tiny robots powered by living muscle have been created by scientists at the University of California, Los Angeles. The devices were formed by "growing" rat cells on microscopic silicon chips, the researchers report in the journal Nature Materials. Less than a millimetre long, the miniscule robots can move themselves without any external source of power. Muscles like these could be used in a host of microscopic devices - even to drive miniature electrical generators to power computer chips."
http://science.slashdot.org/article.p
http://science.slashdot.org/article.p
Pirmdiena, 10. Jan 2005, 22:08
divi_g: Scientists watch matter fall into black hole
An international team of astronomers has made direct observations of clumps of gas, orbiting a black hole at ten per cent of the speed of light. This is the first time scientists have been able to see individual X-ray- emitting lumps of matter go all the way round a black hole.
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Otrdiena, 4. Jan 2005, 18:38
hemmis: Muuziigaa teema - muuziigais dzineejs
paklau, viedie viiri, varbuut kaads var iemest linku uz gana ticamu muuziigaa dzineeja teoriju? nevar buut ka taadu nevar uztaisiit! :D
Piektdiena, 17. Dec 2004, 18:11
divi_g:
"Gemini, Apollo and Space Shuttle astronaut John Young, due to retire in two weeks, says that the human species is in danger of becoming extinct: 'The statistical risk of humans getting wiped out in the next 100 years due to a super volcano or asteroid or comet impact is 1 in 455. How does that relate? You're 10 times more likely to get wiped out by a civilization-ending event in the next 100 years than you are getting killed in a commercial airline crash.' He says that the technologies needed to colonize the solar system will help people survive through disasters on Earth. Young has written about this topic before in an essay called 'The Big Picture'."
http://science.slashdot.org/article.p
http://science.slashdot.org/article.p
Otrdiena, 7. Dec 2004, 20:58
divi_g: Rat brain flies jet
By Robin Lettice (robin.lettice at theregister.co.uk)
Published Tuesday 7th December 2004 16:01 GMT
Florida scientists have grown a brain in a petri dish and taught it to fly a fighter plane.
The "brain", grown from 25,000 neural cells extracted from a single rat embryo, has been taught to fly an F-22 jet simulator by scientists at the University of Florida. It was taught to control the flight path, even in mock hurricane-strength winds.
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Published Tuesday 7th December 2004 16:01 GMT
Florida scientists have grown a brain in a petri dish and taught it to fly a fighter plane.
The "brain", grown from 25,000 neural cells extracted from a single rat embryo, has been taught to fly an F-22 jet simulator by scientists at the University of Florida. It was taught to control the flight path, even in mock hurricane-strength winds.
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Trešdiena, 24. Nov 2004, 09:53
divi_g: BBC NEWS: Faulty genes feed nicotine habit
People who find it difficult to clear nicotine from their body may be more vulnerable to getting hooked on smoking, research suggests.
Scientists found people who carry a gene mutation which slows this process are more likely to find it tough to quit smoking.
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Scientists found people who carry a gene mutation which slows this process are more likely to find it tough to quit smoking.
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Otrdiena, 9. Nov 2004, 09:05
jbook:
Sestdiena, 23. Okt 2004, 12:25
hessin:
Trešdiena, 20. Okt 2004, 20:36
xoox:
Var veidot savus swimmerus un manipulēt ar esošajiem, kā arī iespaidot ekoloģiju - ūdens blīvumu un barības daudzumu. Interesanti radīt, piemēram, divas radikāli atšķirīgas sugas pa 100 eksemplāriem, palaist programmu fonā un pēc 2h apskatīt, kas no tā visa sanācis.
Vienīgie mīnusi - programma uztaisīta diezgan amatieriski un izmanto kaut kādu kreiso video režīmu, kas strādā ne uz visiem datoriem. Bet nu reāls fans garantēts!
Trešdiena, 20. Okt 2004, 20:20
divi_g: Humans Aren't So Complicated
A refined map of the human genome shows that humans have even fewer genes than previously thought -- less than 25,000, about the same as a mustard green.
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Ceturtdiena, 14. Okt 2004, 18:39
x_f: Tas nolāpītais Hercs
Iešāvās prātā pajautāt. Vai kāds nezina, vai zinātniekiem beidzot izdevies noskaidrot džinsktoņas rašānās iemeslus ausīs / galvā? Es zinu, ka ilgu laiku to nezināja. Kā ir tagad?
Svētdiena, 3. Okt 2004, 13:36
mapet: Nu ko? Astranautika - jaunā komercija?
Otrdiena, 28. Sep 2004, 14:33
mapet: Latvijas Astronomijas biedribas sanaksme 2004.gada 6.oktobri
tres'dien, 2004. gada 6. oktobri' pulksten 18:30 Latvijas Universita'te',
Raiņa bulvārī 19, 13. auditoriā'.
DIENAS KĀRTĪBA
1. Astronomijas jaunumi
2. Ilgonis Vilks. "Vasaras astronomijas nometne "Ērgļa ksi'" Kocēnos"
3. Jānis Jaunbergs. "Cassini misija un Saturna izpēte"
4. Dažādi
Ar cieņu,
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