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Humans can hear sounds between 20 Hz and 20 kHz. Bats and dolphins go much further: they can hear sounds over 20 kHz (ultrasounds), while dogs and elephants hear sounds under 20 Hz (infrasounds). For 30 years, researchers stated various hypotheses on how specialized cells in the mammals' inner ear amplify sounds... |
30 July 2007
06:56 GMT |
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If you have just forgotten what you ate in the morning or whom you have met, you should put the blame on proteins. Scientists say short-term memories are made of modifying proteins, while long-term memories are built by new proteins. Thus, chemicals impeding brain cells from processing proteins could inhibit the form... |
18 July 2007
04:46 GMT |
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Jellyfish do not have the "common sense" to always show themselves in the size of a (little) plate. Sometimes they can be enormous monsters, 2m (6 ft) in diameter and 200 kg (450 pounds) heavy. This is the case of the Nemopilema nomurai. Such monsters can easily break fishing nets and kill the fish captured inside th... |
3 July 2007
09:36 GMT |
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You go to the gym, train hard for some months, but - holly s**t - you must pump iron for life to keep looking like that. A drug stopping the dismantling of the muscles would be your dream product to get rid of the gym for a while. As soon as we stop exercising, muscle proteins start melting; idle muscles just keep a ... |
28 June 2007
16:06 GMT |
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It seems paradoxical, but our vulnerability to HIV seems to have been caused by the fact that we got immunity to another related virus. Our evolution seems not to have predicted that humans will eat chimps later on. A research team managed to show this by bringing back to life an inactive chimpanzee retrovirus that h... |
22 June 2007
04:59 GMT |
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Maleness is given by that Y chromosome that leads to the XY formula while females are XX, with two X chromosomes. That's why in the early development of the female fertilized egg, one of the two X chromosomes must be silenced. When by accident this does not happen, severe genetic diseases get installed. Both X c... |
13 June 2007
14:06 GMT |
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Plants make photosynthesis to get all the food they need. And food, for both plants and animals, is represented by three classes of chemicals: sugars, fats and proteins. Sugars and fats are made of carbon, hydrogen and oxygen: these elements are easily extracted from air (carbon dioxide) and water. But proteins conta... |
9 June 2007
11:41 GMT |
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In cultures that do not consume milk or dairy products, cheese can be one of the most disgusting food items. Such is the case of China or other nations in southeastern Asia, even if they have their own variant of vegetal cheese, the tofu. But for animal-based cultures, milk and dairy products are the base of their al... |
29 May 2007
15:51 GMT |
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"The beer belly" is a misnomer as the beer per se does contain many calories.But beer is indeed an appetite stimulant and its consume can lead to storing pounds. Beer also has high levels of purines, which boost the levels of uric acid in the joints, aggravating the gout.Black beer was once promoted as a rich source ... |
28 May 2007
14:51 GMT |
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These alien looking insects spend 17 years underground as larvae sucking sap from tree roots and spend just one summer singing as adults. But now nutritionists are looking at them as at a precious aliment: cicadas contain the same protein amount as red meat (pound per pound) and many vitamins and minerals. "They'... |
23 May 2007
03:10 GMT |
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A newly designed type of DNA computer for human cells could one day lead to the development of a technology able to eliminate the diseased cells and separate them from the healthy ones. The technology is based on the process of RNA interference (RNAi) in which small RNA molecules stop a gene from synthesizing its pro... |
22 May 2007
04:34 GMT |
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Chemotherapy has a lot of side effects, from leaving you bald to severe pain, not to mention that is not 100 % effective and recurrent cancer may still occur. But a new research made on ovarian cancer patients undergoing chemotherapy found that those possessing a mutant disabled type of the tumor-suppressing gene p53... |
17 May 2007
06:39 GMT |
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Have you ever wondered what electricity the astronauts use?It is the latest hardware: photovoltaics (solar panels), hydrogen fuel cells, radioisotope thermal generators. But Matthew Silver, a space systems engineer who heads IntAct Labs in Cambridge, Mass., advocates for microbes or proteins for new power supplies in... |
14 May 2007
08:33 GMT |
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In our search for longevity, the queen honey bee can give us many clues. She is genetically the same with the workers in her hive, but while the workers live for a few months, she can live 10 times longer (up to 10 years) than her sterile sisters and reproducing throughout all her life. A new research at the Universi... |
9 May 2007
08:37 GMT |
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If a virus can barely be considered a living structure (in fact most biologists consider that it's not), the threshold can be pushed further at the limit between life and death obtaining the prions, infecting proteins. As the main weapon against a virus is the vaccine, now researchers are investigating for simil... |
7 May 2007
07:02 GMT |
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That's it: the secret of the Chinese figure is to be found in the soy. A team from University of Illinois focused on how precisely soy helps in losing weight. "We wanted to compare the effects of soy protein hydrolysates and soy peptides with those of leptin because we hypothesized that soy might behave in the b... |
2 May 2007
06:35 GMT |
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The antibodies are blood proteins developed in order to detect and attack germs, like bacteria and viruses. But in the end, their abilities are limited by the genetic information carried by each one of us. This limitation could be enhanced by a new research made at the Oxford University. Here, a research team has a... |
30 April 2007
08:39 GMT |
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Besides its morbid side, breast cancer hits in a woman's sex-appeal. About 65 % of breast cancers are activated by estrogen and progesterone acting on their receptor molecules, and antiestrogen drugs have good results for these cases. 20 - 30 % of the tumors, some with hormone receptors, are activated by high l... |
24 April 2007
04:05 GMT |
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Paralysis can keep people prisoners of their own bodies. It disables physically and mentally. Now, a new research at Northwestern University in Evanston, Illinois, comes with great hope for paralyzed humans. A simple injection of biodegradable soap-like molecules triggered in six weeks nerve regeneration, correlated... |
23 April 2007
03:08 GMT |
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You may hear continuously that you do not use your brain enough. For some it can be obvious: they use a neuron to eat, one to have sex, one to s**t and one to piss. But on a scientific level, a new research found that we really could be using just 20 % of the neurons in our midbrain to form memories. Researchers at ... |
20 April 2007
09:46 GMT |
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Hot sex means better sex, right?But for some, hotter could result in no reproduction at all...An overheated pea aphid won't be able to reproduce. In fact, it's not the insect, but its bacterial symbiont that fails. And all is on a single gene. "It's the first time a mutation in a symbiont has been show... |
20 April 2007
08:56 GMT |
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"A brain sensitive to light" has got a new meaning. Researchers at Duke University Medical Center and the Howard Hughes Medical Institute have engineered a breed of mice whose brain olfactory cells respond to a light flash. They introduced into the cells a gene from green algae that enables them to detect light and... |
19 April 2007
08:14 GMT |
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Would you like to enjoy tulips in October?Or eating cherries in September?For this to be done, scientists had to know what triggers flowering on plants. A new research discovered it: a protein that works like a long-distance messenger from leaf to shoot-tip signaling the moment when the plant must flower. The investi... |
19 April 2007
06:49 GMT |
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Bones had already shown a tight connection between the carnivorous dinosaurs and birds. The discovery of the feathered dinosaurs further confirmed this. But this really tops it off. Scientists managed to compare fossil proteins extracted from a 68-million years old femur bone of an young Tyrannosaurus female to livin... |
13 April 2007
04:36 GMT |
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No Cola or no bacon?Hard to say ...Staying out of junk food is the hardest drudgery. A team at Stanford University Medical School made a year-long research comparing four popular diets, from low-carb to low-fat, and the Atkins resulted to be the best. Thus, in the end, meat lovers laugh at vegetarians. The research i... |
12 April 2007
08:54 GMT |
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You work hard to look like Vin Diesel and you keep on displaying an Adrien Brody look?In this case, you should not miss your milk cups. A new research addressed to bodybuilders signals that milk protein is much better than soy at growing muscles. The study made by a team from McMaster University's Department of ... |
11 April 2007
03:40 GMT |
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Less candies won't make you look like Kate Moss. Less food would better do ... Or at least less caloric ...A new complex research at the Jean Mayer US Department of Agriculture Human Nutrition Research Center on Aging (USDA HNRCA) at Tufts University discovered that calorie-restricted diets varying substantially... |
10 April 2007
10:59 GMT |
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Believe it or not, but a spider thread, related to its thickness, is stronger than steel and more elastic than rubber. It is one of the most expandable, resistant to tearing, and tough materials found in nature. Being organic and non-toxic, the spider silk would represent the ideal material for a large array of medi... |
5 April 2007
08:40 GMT |
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Every living thing, from bacteria to humans, functions on a 24 hours pattern. This is dictated by microscopic pacemakers, biochemical clocks. A traveler experiences jet lag when his/her internal clock does not match the local time. Impairments in the biological clock have been linked to Seasonal Affective Disorder, s... |
28 March 2007
05:12 GMT |
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Today, the problem of bioacumulation of heavy metals in the organisms is severe. Copper, cadmium, zinc, tin, mercury are found in the anthropic or human affected ecosystems in levels that are 10 times higher than in nature. Heavy metals abound around us in tiles (rich in cadmium and zinc), fertilizers (copper), pesti... |
23 March 2007
11:50 GMT |
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Many organism, like fish, insects, frogs, plants, fungi and bacteria, resist through the winter freeze due to antifreeze or ice structuring proteins (ISPs) that bind to the surface of ice crystals to stop their growth and keep the organism alive. Otherwise, the animals exposed to freezing temperatures would normally ... |
19 March 2007
06:33 GMT |
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Memory is important: from not mixing your lovers' name to the learning processes...Neurons must intervene in the activity of the genes to form long lasting memories, usually by employing proteins that inhibit or exhibit the expression of specific DNA patches correlated to specific genes. But now a research team ... |
15 March 2007
04:50 GMT |
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Nematode worms are tinny but they can infect and kill insect pests using a toxin synthesized by a bacteria from their guts on the dead body of the insect. After that, the worms feed on the dead insects. A team at the University of Warwick has found how the toxic protein behaves like a cunningly designed poison pill b... |
12 March 2007
12:47 GMT |
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To be in a good mood, you surely need a good look...That's why you're victimized by the toughest diets.But a new research at the Massachusetts Institute of Technology points carbohydrates poor diets (like Atkins) are more likely to give you a bad mood, as carbohydrates stimulate synthesis of the brain chemi... |
10 March 2007
06:01 GMT |
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The greatest breakthrough in understanding how HIV infects the human body was made by a Dutch research team: mucosa cells covering the human genitalia synthesize a protein that destroys HIV, keeping its infectious ability much lower than it would otherwise be. Researchers even speculate that boosting the activity of ... |
7 March 2007
06:36 GMT |
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Statistics show that couple infertility is due equally to men as to women. Male sterility is triggered by impairment in the multiplication and development of the germ cells (that generate sperm cells) or of their supporting tissues. A new investigation pointed out that bone marrow stem cells could be employed in trea... |
2 March 2007
08:44 GMT |
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