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Tag: "smaller" at biology news

Smithsonian scientists discover new marine species in eastern Pacific

...es, but they are often overlooked because they are smaller than the eggs themselves. "All the tedious dissections and microscope preparations done on a rolling, vibrating ship have really paid off," Norenburg said. One of the unique features of the islands off the coast of Panama is that they host animals ...

Study finds surfing safer than soccer

...when surfing in larger surf (overhead) compared to smaller waves, as the energy of waves increases as it grows in height. In addition, a sea floor with a sandy bottom is much more forgiving upon impact than one covered with reefs or rocks," says Nathanson. The paper cites that establishing an injury rate ...

Stem cells act through multiple mechanisms to benefit mice with neurodegenerative disease

...rk even more efficiently by presenting them with a smaller burden of material to metabolize. The lifespan of the mice doubled. (Neither treatment could work as effectively on its own. In fact, the effect was more than simply additive). This was a demonstration that stem cell efficacy could be enhanced even w...

A new study of living cells could revolutionize the way we test drugs

... yet detected from a living cell, around 100 times smaller than anything previously detected. It added up to an electrical current of just 10 moving electrons. It has given the team confidence that equipment sensitive enough to measure a cell’s heartbeat can be developed. "We already have some ideas about...

Penn study on olfactory nerve cells shows why we smell better when we sniff

...he mouse's nose. This also produced a similar, but smaller reaction in the olfactory neurons. By decreasing pressure of the non-odor solution, they also found that the reaction in the olfactory neurons was less, confirming that it was sensitive to mechanical stimulation. When olfactory neurons respond to ...

Biologists develop large gene dataset for rice plant

...ogy in the last 10 years. Because they are so much smaller than mRNAs, small RNAs went unnoticed for many years, or were considered biologically unimportant, said Meyers. Small RNAs are now known to play an important role in gene regulation, he said, adding that deficiencies in small RNA production can ha...

Vasectomy may put men at risk for type of dementia

...nect another form of dementia to a vasectomy. In a smaller group of 30 men with a dementia called frontotemporal dementia (FTD,) 37 percent had undergone a vasectomy. The earliest symptoms of FTD are personality changes, lack of judgment and bizarre behavior. As in PPA, FTD usually starts at an earlier age, ...

Tumor-suppressor gene is critical for placenta development

...taining placental stems cells, and that it plays a smaller or different role in the cells they give rise to," Leone says. Lastly, the researchers produced transgenic mice that lacked both the Rb gene and a second gene, E2f3. The Rb protein normally couples with, or binds to, the protein encoded by the E2f...

UW launches study testing adult stem cells for heart damage repair

...ondition occurs when the coronary arteries and the smaller vessels that supply oxygen-rich blood to the heart muscle become narrowed or blocked by plaque deposits and blood clots. Poor blood flow and blood clots "starve" and injure the heart muscle. The American Heart Association estimates that every year...

Scientists discover stage at which an embryonic cell is fated to become a stem cell

...visions and unequal, asymmetrical ones that direct smaller daughter cells towards the inside of the embryo. These become the inner cell mass of stem cells. Previously, it was believed that the mammalian embryo starts its development with identical cells and only as these inside and outside cells form do di...

Scientists sequence genome of parasite responsible for common sexually transmitted infection

...ercent of the genome. "Parasites generally have smaller amounts of DNA than non-parasitic organisms, but in this case, there was ten times as much DNA than we originally thought there would be," says lead author Jane M. Carlton, Ph.D., who led the project while at The Institute for Genomic Research (TIGR)...

World's largest flower evolved from family of much tinier blooms

...giant plant evolved from a family typified by much smaller blossoms, rafflesia is unusual enough that it's frankly been difficult to imagine it fitting neatly into any plant family," Davis says. "Many botanists had refused to even speculate on where this botanical outlier might fit into the tree of life." ...

Cancer tip -- Nanoparticles can damage DNA, increase cancer risk

...," Pacheco said. "Several studies have shown that smaller particles are more likely to enter cells and cause more toxicity." According to Pacheco, what makes matters worse is the fact that so far, aside from preventing their release, there are no known ways to prevent the harmful effects of environmenta...

New research shows that flu is a trigger of heart attacks

... jab actually have one and this percentage is even smaller in Europe, said Professor Mohammad Madjid, the lead author of the report. "Our research has shown that influenza epidemics are associated with a rise in coronary deaths. This calls for more intensive efforts to increase the vaccination rate in peo...

No-scalpel vasectomies by skilled surgeons may speed recovery

...esumption of postoperative sexual activity. The smaller trial included 100 participants treated at a singl...an 10 no-scalpel vasectomies in the trial. The smaller study showed no difference in postoperative results between the two techniques, but this, review aut...

Applied scientists create wrinkled 'skin' on polymers

...It's almost like using an airbrush on fabric. At a smaller scale the desired morphology of wrinkles can be achieved by controlling the ion beam intensity." Because only the areas exposed to the beam are affected, the method enabled the scientists to create a variety of patterns--from simple one-dimensional...

Napoleon's mysterious death unmasked, UT Southwestern researcher says

...of a large, ulcerated lesion on his stomach, and a smaller ulcerated lesion in another part of his stomach that had penetrated the wall and reached the liver. The researchers ?obviously unable to observe the body ?compared the original descriptions of the lesions with modern images of 50 benign ulcers and...

Protein key to organ growth

... are reduced in the cells of fruit flies, they are smaller than normal, indicating that the protein plays a major role in the growth and proliferation of cells, said researchers at Baylor College of Medicine in a report in current issue of the journal Nature. Work in his laboratory shows that TCTP plays a ...

Bumblebee house warming -- it takes a village

...true," O'Donnell said. "We don't know whether the smaller bees are really better at warming the nest, or whether the larger bees avoid incubating for other reasons. In general, larger bumblebee workers are foragers for food and they could be committed to that task. This kind of size-based division of labo...

Microfluidic chip helps solve cellular mating puzzle

...eries of tiny channels and chambers, some 20 times smaller than the diameter of human hair. Within the chip, computer-controlled fluid pressure and microscopic valves allow the researchers to isolate and conduct experiments on extremely small clusters of cells. "The level of control we can achieve on the con...

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