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Tag: "true" at biology news

Scientists Replicate Hepatitis C Virus in Laboratory

...tained within the human liver cells behaved like a true HCV infection by producing fully formed copies of the virus and releasing them from the host cell into the culture medium. Further testing is needed before the researchers can determine if the viral particles produced in this system are in fact infec...

Scientists find missing enzyme for tuberculosis iron scavenging pathway

... explains Dr. Baker. "Importantly this seems to be true even of the bacteria that are taken up by macrophages in the lung and enter a dormant state ?these are the hardest to attack with drugs." ...

Female sex hormones play a vital role in defense against sexually transmitted diseases

...e trial against HSV-2 and if the mice results hold true for women, they could suggest vaccination protocols under combination hormone therapy to get the best benefit from the vaccine. Work in this area is important because one in every four sexually active adults is seropositive for HSV-2 and women are m...

An HIV Protein Plays a Surprising Role in Gene Activation

... activator called E1a—the authors show that what's true for yeast also holds for mammals, or at least for the human cell lines investigated here. Each effector was required for PIC assembly, which was in turn required to activate transcription. The big surprise came in the next round of experiments, whic...

Mouse brain tumors mimic those in human genetic disorder

... only in the younger mice."If this finding is also true in humans, this strongly argues thatcontrast enhancement on MRI alone is not a reliable test of tumorprogression," Gutmann says. "If we rely on contrast enhancement inchildren with NF1 optic pathway gliomas, we may be treating kids whodon't need to b...

New Clues Add 40,000 Years to Age of Human Species

... fossils, the researchers linked the Omo hominids, true Homo sapiens, to a single period in time. “Some have considered Omo I to be more ‘modern?in appearance,?says Mark Weiss, the NSF officer who oversaw this research. “It’s fascinating that we can now see that these two rather different individuals w...

Why do insects stop 'breathing'? To avoid damage from too much oxygen, say researchers

...byproduct, when the insects are underground. As is true for miners, insects, while underground, are faced with high-carbon-dioxide and low-oxygen amounts, necessitating a better ventilation system. While oxygen is essential for their cells to produce energy, the removal of carbon dioxide from their bodies...

Affymetrix and the Karolinska Institutet Announce Translational Medicine Strategic Alliance

...l use sufficiently large sample sizes to establish true clinical relevance of both gene expression and DNA sequence variation in key areas of unmet medical needs. "Today we have access to a very broad range of population-based clinical materials and data, that we want to study in order to understand the ...

Implanted Devices Detect High-Risk Heart Failure Patients

...h can make it difficult for cardiologists to get a true idea of how the disease is progressing," said Gilliam, chief of electrophsysiology at Duke. "This study shows that changes in heart rate variability just might be better in picking out those people at highest risk." In their analysis of 1,411 heart ...

Chemists identify immune system mechanism for methamphetamine binges

... researcher. "If the mechanism we proposed proves true in humans, then it will help explain why addicts go on prolonged binges, requiring more frequent intake and ever-increasing amounts of the drug in order to achieve a high," says Janda, who led the study with his former student, Tobin Dickerson, Ph.D....

Low level of extinction during ice age linked to adaptability

... of America. "If the patterns I detected also are true for the modern ice age -- and other researchers' results suggest that they may be -- then modern marine life ought to be relatively resistant to extinction," he said. "Yet species are dying off at an alarming rate. It may be that humans have altered ...

Birds brains reveal source of songs

...he youngsters' songs become less variable and more true to the old standards. Some years ago, Bottjer had observed that disabling a young finch's AFP circuit stopped the learning in midstream. The bird still sings, but never learns the right song. To explain this effect, scientists theorized that the AFP ...

Double triumph in stem cell quest

...stion, though, is whether the stembrids really are true ESCs. Verlinsky says the cells express a number of...ace markers, Verlinsky's team must show that, like true ESCs, the stembrids are capable of forming cancers called teratomas, which contain a mixture of diff...

Undesirable expatriates: Preventing the spread of invasive animals

...ecoming invasive. This figure, which appears to be true for other animals as well, is significantly higher than the 1% probability that dominates invasive species risk assessment. The 1% probability is based on plant invasions. Introduced animals do not act like introduced plants-- they appear to have a m...

Scientists discover that three overlapping signals in embryo help get the backbone right

...amese twin phenomenon. So, we expect it to also be true in humans." ...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...ists don't fully understand, he says. The same is true of fish that have gone to sea but don't return to their stream of origin to spawn, instead straying to some other waterway. The process of straying is entirely mysterious, Quinn says. Do strays identify the home stream but then go elsewhere? Do they...

Measuring Enzymes At End Of Cancer Pathway Predicts Outcome Of Tarceva, Taxol

... we have a technology that can rapidly measure the true activity of CDK2 in a tumor sample," Ueno says. First author Fumiyuki Yamasaki, M.D., Ph.D., a post-doctoral fellow, is presenting the findings at AACR. ABSTRACT # 459 Profile CDK to Predict Effectiveness of Taxol A different research team, headed...

Scripps scientists find potential for catastrophic shifts in Pacific ecosystems

...me during warm and cold periods, thus they are not true regimes," said Sugihara of the Physical Oceanography Research Division at Scripps. This is at least true for these data from the 20th century. "Finding nonlinearity is fundamental for understanding and ma...

Primates on the brink

...-SSC Primate Specialist Group. "This is especially true of Madagascar, one of the planet's biodiversity hotspots that has lost most of its original forest cover. More than half its lemurs, none found anywhere else in the world, are threatened with extinction. Without immediate steps to protect these uniqu...

High fidelity keeps human DNA assembly line humming

... mechanism for RNA synthesis. "This is a tried and true design and our study explains why this is an enduring design." The paper, "Dynamic Error Correction and Regulation of Downstream Bubble Opening by Human RNA Polymerase II," also is authored by research associates Xue Gong and Chunfen Zhang in Burton...

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