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Tag: "exist" at biology news

How HIV 'exhausts' killer T cells

...D-1 switch could begin very soon, since such drugs exist already. However, he cautioned that these kinds of drugs could cause serious side effects, including autoimmune reactions that trigger the immune system to attack the body. Walker added that the researchers' findings will also likely have application...

New tiger report release: Tiger habitat down from just a decade ago

...d tiger populations. The largest tiger landscapes exist in the Russian Far East and India. Southeast Asia also holds promise to sustain healthy tiger populations although many areas have lost tigers over the last 10 years. "As tiger range spans borders, so must tiger conservation," said Eric Dinerstein...

Deep-water discovery

...nd other features of deepwater reefs simply do not exist for the bulk of the seafloor. With such little information available, Grasmueck compared typical seafloor exploration to arriving on the bottom of the Grand Canyon at night with a flashlight and then attempting to ascertain the significance and topo...

Chromosomal abnormalities in sperm higher after vasectomy reversal

... number of specific chromosomes or chromosome sets exist within the nucleus of the cell) and diploidy (containing two sets of chromosomes ?unlike most cells in the body, the sex cells should only contain one set of chromosomes. "The rate of abnormality was about 10 times higher than the aneuploidy and di...

Drug discovery team to explore newly discovered deep-sea reefs

...nd other features of deepwater reefs simply do not exist for the bulk of the seafloor. With such little information available, Grasmueck compares typical seafloor exploration to arriving on the bottom of the Grand Canyon at night with a flashlight and then attempting to ascertain the significance and topo...

Viral genetic differences are possible key to HIV dementia

..., moreover, that commonalities in this environment exist across individuals," he asserts. Another mutation in the V3 loop appeared consistently in virus from study subjects who demonstrated the most severe cognitive impairment. This mutation was absent in sequences from subjects with little or no cogniti...

New HIV study identifies high-risk subgroups of adolescents

...cted sex, mental health crises and substance abuse exist at the same time, and also vary by gender. “This study tells us that not all risky adolescents have the same risk behaviors and that the patterns seem to be different between boys and girls. It's also important because it suggests that programs des...

Mitochondrial DNA sequencing tool updated

... cytoplasm. Hundreds to thousands of mitochondria exist in each human cell, occupying up to a quarter of their cytoplasm. Sometimes informally described as "cellular power plants," mitochondria convert organic materials into ATP, the cell's energy currency and without which life would cease. As early...

Human behavior changes the number of strains of infectious diseases

... that only one strain of an infectious disease can exist at one time, but observation suggests otherwise. In a study in the August issue of The American Naturalist, Ken Eames and Matt Keeling (University of Warwick) use a mathematical model to help explain multiple strains, showing that the way humans inte...

Bacteria beat the heat

How do some microorganisms manage to exist and even thrive in surroundings ranging from Antarctica to boiling hot springs? A team of scientists from the Weizmann Institute's Plant Sciences Department, led by Prof. Avigdor Scherz, has found that a switch in just two amino acids (the building b...

Mosquito spray increases toxicity of pyrethroids in creek, study finds

... Weston and colleagues have shown that pyrethroids exist in agricultural and urban streams at levels toxic to sensitive aquatic life. General urban pesticide use, such as applying insecticides on lawns, gardens and around the perimeter of homes, is likely responsible for the bulk of the pyrethroids found i...

Brittle prions are more infectious

... colleagues had discovered that the same prion can exist in different strains and have different infectious properties. These strains arise from different misfoldings of the prion protein that result in different conformations. A similar strain phenomenon has been described for mammalian prions. More gener...

Researchers find molecular 'brake' to cell death

...produced from the "pools" of free nucleotides that exist in the cell cytoplasm. Nucleotides are the primary structural chemical units that make up DNA, RNA and proteins, and they combine to play a variety of roles in the cell, such as formation of ATP. However, through a series of biological and biochemic...

Mayo Clinic researchers discover cancer cells may move via wave stimulation

... They form in response to stimulation from EGF and exist for 10 to 20 minutes before disappearing. Waves intrigue researchers because wave-based internalization of activated EGFR to the interior of the cell was a previously unknown mechanism. The wave pathway appears to be a parallel pathway vital for tran...

Science finds new fix for UV-damaged skin in arthritis treatment

...that utilize signal-blocking ingredients currently exist in the marketplace, but products with n-acetyl glucosamine/niacinamide - which block melanin at two different points in the pigment producing process - are among the newest and most studied. "Pigmentation is an appearance issue that strikes an emo...

Taking evolution's temperature: Researchers pinpoint the energy it takes to make a species

...ue - helps explain why more living species seem to exist near the equator, a scientific observation made even before naturalist Charles Darwin set sail to South America on the H.M.S. Beagle nearly two centuries ago. It may also have a bearing on concepts such as global warming and efforts to preserve dive...

Chocolate milk could be key to longer, healthier life

...energy and perform work stems from structures that exist inside our cells called mitochondria. As we grow older the amount of mitochondria we have decreases and with it our respiratory capacity. "This decline is determined by the turnover of proteins in the mitochondria. We hope to highlight an effective...

US woman gives birth to baby from world's first frozen donor egg bank

...nology to successfully freeze women's eggs did not exist until recently, prompting Cryo Eggs International ... daunting and difficult path. Many problems that exist with fresh donor eggs such as synchronizing the donor's cycle with the cycle of the infertile woman ...

Evolution mystery: Spider venom and bacteria share same toxin

...ith a unique toxin, and that toxin also happens to exist outside the animal kingdom in this particular bacterium," she added. "A pattern like this raises the possibility of lateral gene transfer as a explanation." Lateral gene transfer refers to the movement of genes between the genomes of unrelated organi...

Aging cells, aging body: Fresh evidence for a connection

...til now, no one has been able to confirm that they exist in appreciable numbers in old animals." So the Brown team began to study aging animals ?baboons living on a research preserve that ranged in age from 5 to 30. In human years, that age range is roughly 15 to 90. Veterinarians took small skin samples...

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