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Tag: "association" at biology news

New clues to how sex evolves

...randomly, not in a single bunch; nevertheless, the association with the nuclear envelope seems to serve a similar function, which is to stabilize chromosome interactions during pairing." Exactly how, Dernburg says, is still unknown. "Zinc-finger proteins evolve rapidly because they are modular, so that combi...

Heavy smoking cuts women's chance of pregnancy -- even with donated oocytes

... real association. What would confirm it as a real association is to find it still applies in a large number of cases. However, if it is confirmed as a real association it suggests that, paradoxically, tobacco constituents affect the uterus in different ways in differe...

Life in the extreme

..."In the bivalve species Idas sp., we have found an association with six different symbionts. This is the widest diversity of symbionts ever described in a bivalve species," said Duperron. This means that the mussel, depending on which type of symbionts it carries, can derive its energy from either sulphide or...

Hopkins researchers discover how brain protein might control memory

...drink in his hand, his brain remembers that former association and suddenly the craving returns. These types of long-term associations are memories wired in your brain." Years ago, Worley and his colleagues, studying laboratory rats, found that their brains made lots of Arc protein while the animals were awa...

'Allergy cells' can aggravate cancer and psoriasis

... and cancer. Mast cells are most known for their association with allergic reactions, as they act like microscopic "bombs" to trigger the release of a number of substances that give rise to the classic allergic symptoms, such as swelling, congestion and itching. The explosive reactions are activated when an al...

Resistance and genetic sensitivity to sleeping sickness

...e development of the disease. The researchers used association techniques in order to determine the influence of certain mutations on the DNA of genes coding for particular immune system proteins (cytokines) in manifestation of the disease. This type of study consists in comparing the frequency of a mutation in ...

Male chimpanzees prefer mating with old females

...o be approached for copulation, were more often in association with males during estrous periods, copulated more frequently with high-ranking males, and gave rise to higher rates of male-on-male aggression in mating contests. The findings, in addition to supporting the idea that long-term pair bonding and men...

Pair of microRNA molecules controls major oncogene in most common leukemia

... Cancer Center. "We have found a direct inverse association between expression of miR-29 and miR-181 and that of the TCL1 oncogene," he said. "It works in both directions. High expression of these miRNAs correlates with low expression of TCL1, in the indolent form of cancer that is less likely to progress. A...

New technology used to construct the first map of structural variation in the human genome

... number changes in cancer cells, but also possible association of CNVs with common diseases," explains Dr. Hiroyuki Aburatani, one of the scientists who led the development of the algorithm. "We'll be able to develop diagnostic tests with sub-microscopic resolution, and because the analysis detects SNPs--single...

Researchers make progress in studying genetic traits of India-born populations

...pidemic proportions, making genetic cataloging and association studies of particular importance. In response to this dearth of information, a team of researchers, including Pragna I. Patel, professor of biochemistry and molecular biology at the Keck School of Medicine of the University of Southern California (...

How many genes does it take to learn? Lessons from sea slugs

... genes." Researchers studied gene expression in association with specific networks controlling feeding or defensive reflexes in the sea slug. To their surprise, they identified more than 100 genes similar to those associated with all major human neurological diseases and more than 600 genes controlling develo...

Resistant bacteria increasing source of muscle infection

...damaging them irreparably. "There seems to be an association between bacteria carrying the pvl gene and the severity of disease," she said. However, she said, they have not yet determined whether the problem is this specific gene or another that is close to it. Others who participated in this research inclu...

High dopamine transporter levels not correlated with ADHD

... not determine whether an individual has ADHD, the association of inattention ratings and transporter levels in both ADHD and normal subjects is consistent with the use of treatments such as stimulant medications, which block activity of the transporter, in ADHD." Ongoing research in adults with ADHD, currentl...

Inflammation markers identify fatigue in breast cancer survivors

...s colleagues' research is the first to document an association between biological mechanisms involved with the immune response and persistent fatigue. "It is such an important quality of life issue. Many patients are surviving from their cancer treatments, but they are surviving with substantial impairments in...

Large-scale genomics project will hunt genes behind common childhood diseases

...of the company's important genome-wide mapping and association studies over the past several years, and served as director of Respiratory, Inflammatory and Pharmacogenomics Research, vice president of Clinical Sciences, and later as vice president of Business Development. "Our goals for the Center are to genera...

Variations in detoxifying genes linked to Lou Gehrig's disease

...s may help elucidate the complexity of PON cluster association with ALS," Siddique said. Siddique hopes to study DNA samples from Gulf War veterans with increased incidence of sporadic ALS and has applied for their DNA from the Veterans Administration collection. ...

Researchers attack tumor cells by exploiting dependency on sugar metabolism

...n mammary tumor cells might help shed light on the association between tumor survival and the interplay between glycolytic phenotype and mitochondrial metabolism. The researchers used a sophisticated genetic technique to reduce levels of lactate dehydrogenase A (LDH-A), an enzyme required for the glucose to lact...

In drug design, a loose fit may be best bet

... with the widely held notion that the stronger the association between a hormone and its receptor, the more effective its cellular signaling. If the findings hold true for similar hormone-receptor reactions, they could help change the way that drug therapies are designed for a host of health problems, from smell...

Cultural transmission in bats: When listening for dinner, bats learn from their neighbors

...nformation: in this case, the novel (experimental) association of the calls of a poisonous toad species with the ...ed the effectiveness of learning this experimental association through three different means: (a) a social learning group, in which a bat inexperienced with the ne...

High estrogen levels associated with dementia in older men

.... The researchers hypothesize that the estradiol association could be explained by increased aromatase activity in the brain which may be associated with a neurodegenerative process. It is then possible that the high levels of estradiol are a consequence or early marker of Alzheimer's disease rather than a cau...

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