Tag: "distinct" at biology news

Tips from the Journals of the American Society for Microbiology

...rchangeable. "Our results show that genetically distinct strains from grapes and almonds differ in population behavior and pathogenicity in grapes and in the ability to grow on two different media," say the researchers. (R.P.P. Almeida, A.H. Purcell. 2003. Biological Traits of Xylella fastidiosa strains ...

UCLA study sheds new light on island evolution

Evolution of genetically distinct species that live exclusively on land can be slowed by over-water dispersal following tropical storms, according to a UCLA study that suggests classic theories of island evolution need an overhaul. In an article published Thursday, Dec. 4, in the jou...

Study finds that fungus farming by snails causes marsh grasses to wither

..."fungiculture" was thought to occur only in three distinct insect lineages, including certain ants, termites and beetles. The development of fungus-growing behavior has enabled these insects to rise to major ecological importance in land communities where they can strongly affect ecosystem process and commun...

Cell death promotes learning growth

...al learning measured in the Morris water maze have distinct actions on cell proliferation. In this task, two phases of learning can be distinguished: an early phase during which performance improves rapidly, and a late phase during which asymptotic levels of performance are reached. These two phases seem to i...

Lab tests can reveal how patients respond to Gleevec

...t on drug response. The results revealed three distinct subsets of GIST. Those with "exon 11" mutations of KIT responded well to Gleevec; 84 percent of patients with such tumors had a partial remission (greater than 50 percent shrinkage of their tumors), and half of the members of this group are still ben...

Scientists report on promising new approaches to induce cancer cell suicide

...markable finding, given that brain tumors are very distinct in their biologic makeup. "Despite our best efforts in the laboratory and the clinic, the survival rate for glioblastoma the most common and lethal brain tumor -- hasn't changed in ten years," said Jeremy Rich, M.D., assistant professor in the Bra...

Proteins may help identify patients who will respond better to treatments in certain cancers

...ical benefits to the patients," she added. Eight distinct groups of tumors, each with similar biological profiles, were identified within the patient group. Drs. Buffa, Soren Bentzen and their colleagues looked at whether it was possible to predict the outcome of radiotherapy based on these molecular profil...

Genes control severity of heart failure, study finds

...ut affecting survival and vice versa suggests that distinct genes may underlie the gradual decline in heart function characteristic of heart failure and the risk of sudden death associated with the disease." The next step will be to identify the precise genes within these regions that modify heart failure out...

Major mutations, not many small changes, might lead way to new species

...ther differences make the species of monkeyflowers distinct and nearly eliminates crossbreeding in the wild. In an experiment funded by the National Science Foundation, the researchers changed the region of a chromosome, thought to be a single gene, that affects the concentration of yellow pigment in petals ...

Transparent fish provide window on blood formation and marrow transplantation

...ts, the researchers found that they could separate distinct populations of red and white blood cells based on ... expression of these two fluorescent proteins into distinct blood cell populations, and to use those to visualize how the transplanted cells will actually behav...

Scientists work to break cellular code

... out multiple functions in the cell in response to distinct stimuli. For example, expose a yeast transcription factor called Ste12 to a certain pheromone from a potential mating partner, and it induces a mating response. But starve the yeast for nutrients, and the same transcription factor provokes filamenta...

JCI Table of Contents, November 3, 2003

...ession of the alpha1beta1 integrin, VLA-1, marks a distinct subset of human CD4+ memory T cells . AUTHOR CONT...t loss of B cell tolerance can be divided into two distinct components with different CD4+ cell requirements. CD4+ cell diversity is specifically required for t...

Distinct genes influence Alzheimer's risk at different ages

...sease, the new study is the first to indicate that distinct genes might also determine the very late onset of Alzheimer's disease, in which symptoms first appear after the age of 80, said Duke Center for Human Genetics researcher William Scott, Ph.D., the study's first author. The team's findings will appear ...

Pack rat middens give unique view on evolution and climate change in past million years

...separate species, including birds, reptiles and 73 distinct mammals. One of the cave's most abundant mammals was the sagebrush vole, a 3- to 4-inch rodent, excluding tail, that lived on seeds and plant material and served as a major food source for raptors and small carnivores. Because the voles were so prev...

New therapies under development promise improved relief for Non-Hodgkins Lymphoma cancer patients

...s of new therapies to discover treatment with some distinct advantages to differentiate their products and provide better relief for patients. "The need for improved lymphoma treatments has by no means disappeared and a large market awaits developers of successful new products," says Hester. Sensing the pote...

Intraepithelial neoplasia may be a leading risk factor for prostate and ovarian cancers

...nderlying tissues that we believe are sufficiently distinct to have potential as a diagnostic and prognostic marker for both early detection and prevention," she said. Results from this study have shown that normal ovarian surfaces that are hiding a cancerous lesion can develop changes in the nuclear chromati...

Gene controls age at onset of Alzheimer's and Parkinson's diseases

...ly consider Alzheimer and Parkinson diseases to be distinct disorders, the two exhibit a lot of overlap both clinically and pathophysiologically," said Jeffery Vance, M.D., director of Duke's Morris K. Udall Parkinson's Disease Research Center and associate director of the Duke Center for Human Genetics. "Thi...

Who moved my cheese!?

...annot perceive at all, are quickly recognizable as distinct and meaningful odors to rodents and other animals in which the Nose Knows. But just how quick? By measuring the speed of smell, researchers at Cold Spring Harbor Laboratory have now found that unlike humans, rats can tell two very similar odors apart...

New medicines at risk from biodiversity loss

...llow, harpoon-like tooth. Each species has its own distinct set of around 100 'conotoxins', which like a gourmet chef it mixes in constantly changing proportions, thereby preventing evolution of resistance in their prey. Co-researcher Aaron Bernstein, also of Harvard, says "To date, only about 100 of the esti...

NSF awards four-year, $3.9 million grant to plant biology team led by University of Georgia

...maintenance of these structurally and functionally distinct zones of the SAM is achieved by differential expression patterns and interactions of thousands of plant genes. New technologies now give scientists the ability to identify and analyze genes required for meristem function in maize. Laser dissection m...

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