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Tag: "populations" at biology news

Jump-starting T Cells In Skin Cancer

...e. Understanding the characteristics of the T cell populations that are expanded after vaccination may help in the development of more effective anti-tumor vaccines. Tumor-specific T cells can be detected in the blood and the tumors of many melanoma patients, and yet these cells are unable to kill the tumor. Wh...

Source of molecular triggers in cutaneous T cell lymphoma identified

...ymphoma (CTCL) cells to clonally expand into large populations of malignant lymphocytes. CTCL is the most common adult malignancy of T lymphocytes, the white blood cells of the immune system. Finding CTCL triggering factors has been a major goal of Richard L. Edelson, M.D., Director of the Yale Cancer Center, a...

Study Links Ebola Outbreaks To Animal Carcasses

... direct links between the deadly disease in animal populations and humans. "This research proves that hunting an... for the assumption that Ebola moves from wildlife populations to humans through the consumption or handling of carcasses or bushmeat. Specifically, the researche...

The secret lives of whales

... because some argue that the recent surge in minke populations is unprecedented and is hampering the recovery of ...n, not just an individual. “Knowing the history of populations is critically important to managing their future,?says Palumbi, “especially for populations like the...

Researchers reveal the infectious impact of salmon farms on wild salmon

...arasitic sea lice from salmon farms to wild salmon populations is much larger and more extensive than previously ...y to be damaging for already dwindling wild salmon populations in British Columbia, where the study took place. In Europe, transfer of parasites is generally acce...

U-M scientists find genes that control growth of common skin cancer

...CC tumor growth, suggesting that the residual cell populations mayrepresent BCC tumor stem cells, but Dlugosz cautions that there is asyet no definitive evidence that tumor stem cells exist in BCC. Inadditional studies, the researchers found that regressing BCC cellscould be reprogrammed to differentiate into va...

Genetically modified natural killer immune cells attack, kill leukemia cells

...ncountered leukemic cells. In order to grow large populations of NK cells, the team started with samples of blood containing a variety of different immune system cells. They placed this sample into a dish containing a type of human leukemia cell called K562. Campana's team genetically modified the K562 cells so...

Ants Genetic Engineering Leads To Species Interdependency

...volved to employ. Intwo species of harvester ants, populations have been discovered inwhich queens mate with male...caste she will adopt.However, in two harvester ant populations in southern New Mexico,queens and workers from the same colonies are genetically verydifferent; in b...

Same mutation aided evolution in many fish species, Stanford study finds

...ause ocean fish quickly evolved into such distinct populations when they colonized new freshwater lakes and streams, they are an ideal model for understanding how animals adapt to their unique environments. The recent work carries a few surprises. Kingsley said that the gene in question, called Eda, is an old f...

Introduced foxes transformed vegetation on Aleutian Islands from lush grasslands to tundra

...ed islands (defined as those where self-sustaining populations of foxes persisted into the late 1990s). "When yo...isappear completely from islands with foxes, while populations of crevice nesters were reduced but not eliminated. Ledge nesters such as murres and kittiwakes, whi...

Researchers trace evolution to relatively simple genetic changes

...ies. But since then, biologists have realized most populations are recent descendants of marine sticklebacks. Marine fish colonized new freshwater lakes and streams when the last ice age ended 10,000 to 15,000 years ago. Then they evolved along separate paths, each adapting to the unique environments created by ...

Octopuses occasionally stroll around on two arms, UC Berkeley biologists report

...ies. But since then, biologists have realized most populations are recent descendants of marine sticklebacks. Marine fish colonized new freshwater lakes and streams when the last ice age ended 10,000 to 15,000 years ago. Then they evolved along separate paths, each adapting to the unique environments created by ...

Research Gives Hope For Liver Damage

...A have, for the first time, identifiedtwo separate populations of immune cells macrophages in the liver. Onegroup of macrophages causes scarring to the liver, but the next wave ofimmune cells, produced only a few days later, change function to breakdown and reabsorb the scarring. These findings, published in the...

UCSD discovery may help extend life of natural pesticide

...lants. "It will now be possible to monitor insect populations near fields where Bt is used and catch insect resistance in its early stages by looking for changes in glycolipids," said Aroian. "If changes are detected, switching to another pesticide, perhaps even another variety of Bt that works through a differ...

Boosting HIV screening can increase survival and is cost effective

...s. Frequent HIV screening in moderate-to-high-risk populations could produce life expectancy gains at costs that compare favorably to many commonly employed screening interventions in other chronic conditions, including breast cancer, colorectal cancer, diabetes and hypertension. Paltiel said that even in settin...

Photos show jaguar vamping for camera

...n American countries designed to safeguard healthy populations of this spectacular big cat. ...

In the migratory marathon, parasitized monarchs drop out early

...ite infections are much lower in migratory monarch populations compared to year-round residents that do not migra...ates, could ultimately replace the large migratory populations with smaller remnants that breed year-round and do not migrate. Study results suggest that if migra...

A new study examines how shared pathogens affect host populations

...ea that sharing pathogens necessarily affects host populations negatively. They show that if there is frequency-dependent transmission, a host can be rescued from pathogen-mediated extinction by the presence of a second host with which it shares a pathogen. Sharing a pathogen among one or more alternative speci...

Surprising findings reported about iron overload

...ught to have occurred among Celtic or Scandinavian populations 1,500-3,000 years ago, and the mutation may have h... percent correct responses about screening at-risk populations for hemochromatosis, iron overload, and associated abnormalities. As the HEIRS Study shows, iron ov...

Live fast, die young true for forests too

...n the long run, such changes might affect wildlife populations that prefer younger or older forests, said van Mantgem. Stephenson and van Mantgem pointed out that increased dominance by younger trees could also lead to changes in the amount of carbon stored in forests, though the direction and magnitude of such...

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