Kotetsu - Slashdot User

Sunspot Activity Continues To Drop 435

Posted by CmdrTaco on Thursday April 09, 2009 @10:42AM from the see-spot-run dept.

slreboy writes "The sunspot cycle is behaving a little like the stock market. Just when you think it has hit bottom, it goes even lower. The year 2008 was a bear. There were no sunspots observed on 266 of the year's 366 days (73 percent). To find a year with more blank suns, you have to go all the way back to 1913, which had 311 spotless days. Prompted by these numbers, some observers suggested that the solar cycle had hit bottom in 2008. Maybe not. Sunspot counts for 2009 have dropped even lower. As of March 31st, there were no sunspots on 78 of the year's 90 days (87 percent)..."

Cracking the Code of Bacterial Communication 58

Posted by samzenpus on Thursday April 09, 2009 @02:08AM from the they-want-more-petri-dishes dept.

TEDChris writes "Microbiologist Bonnie Bassler explains her discovery of 'quorum sensing' — the amazing ability of bacteria to communicate with each other and coordinate attack strategies (video). By cracking the communication code, she has opened up potential for a new class of drugs tackling microbial diseases. The talk got a massive standing ovation at this year's TED and has just been posted. To quote one commenter: 'This is by far the most inspiring, amazing, and far-reaching talk I've seen in a very long time.'"

Chimpanzees Exchange Meat For Sex 313

Posted by samzenpus on Wednesday April 08, 2009 @08:48PM from the what-do-I-get-for-a-cheeseburger dept.

the_therapist writes "A team from the Max Planck Institute for Evolutionary Anthropology in Germany, studied chimps in the Tai Forest reserve in Ivory Coast and discovered that chimpanzees enter into 'deals' whereby they exchange meat for sex. Among the findings are that 'male chimps that are willing to share the proceeds of their hunting expeditions mate twice as often as their more selfish counterparts.' They also found this to be 'a long-term exchange, so males continue to share their catch with females when they are not fertile, copulating with them when they are.'"

Cells In the Retina Tile Like Puzzle Pieces 29

Posted by timothy on Wednesday April 08, 2009 @01:40PM from the rather-than-scrabble-tiles dept.

tim writes "Recent work at the Salk Institute in La Jolla, Calif. shows that cells in the retina sample visual space like a multi-layered jigsaw puzzle. High resolution measurements of light response reveal that individual cells have irregular shapes, but together their shapes coordinate to tightly cover visual space. This type of large scale, exquisite coordination could be a general organizing principle of the brain, but no one has seen it previously because technical obstacles typically prevent recording from large cell populations." Here's a link to full paper.

New Discovery May End Transplant Rejection 201

Posted by Soulskill on Wednesday April 08, 2009 @09:38AM from the time-to-get-that-extra-liver-you've-always-wanted dept.

mmmscience writes with this excerpt from the Examiner: "Big news in the medical world: scientists in Australia have found a way to stop the body from attacking organ transplants, greatly decreasing the possibility of organ rejection. ... When a new tissue is introduced, one's immune system kicks into overdrive, sending out cells known as killer T cells to attack and destroy the unknown tissue. ... Professor Jonathan Sprent and Dr. Kylie Webster from Sydney's Garvan Institute of Medical Research focused on a different type of T cells — known as regulatory T cells (Treg) — in this study. Tregs are capable of quieting the immune system, stopping the killer T cells from seeking out and attacking foreign objects."

Slashdot Top Deals