Tag: "source" at biology news

New study reveals signaling pathways required for expansion of pancreas stem cells

...ch contains proliferating stem cells. A possible source of pancreatic progenitor cells is thought to derive from pancreas epithelial duct cells. The pancreas of the mouse model that the Sarvetnick lab used contains an abundance of regenerating stem cells from the ducts. "Importantly, we found that if we i...

HIV-1's high virulence might be an accident of evolution

...the more virulent of the two human strains and the source of the majority of HIV infections throughout the world. The less pathogenic HIV-2 evolved from a virus that infects long-tailed relatives of baboons called sooty mangabeys. While HIV and SIV strains all infect T cells that are critical for a function...

Beekeepers work hard for the honey, despite changing tupelo forest

... material has cut off many tupelo trees from their source of fresh water. Upstream water diversion also has lessened the flooding needed for a healthy tupelo forest. Exotic pests are taking their toll, and beekeepers throughout Florida are losing between 30 percent and 50 percent of their bee colonies to ...

Even when faint, ovary scent draws sperm cells

...ed simply by raising or lowering the height of the source medium, in this case a buffer solution. The researchers affixed a microscope and camera to the device and then recorded video of the sperm during assays. "We combined in a microfluidic device the ability to generate a chemical gradient with transpo...

A new look at the state of the oceans

...ished at the Alfred Wegener Institute to provide a source of information for students participating in courses at the Biological Station Helgoland. Plankton is constituted by free-floating organisms in the water, from bacteria to jelly fish. The image material and related information on planktonic organisms...

Researchers discover which organs in Antarctic fish produce antifreeze

...ver, since the vertebrate liver is well known as a source of secreted plasma protein, so there was no reason...iver AFGP biosynthesis, in fact, suggested another source of production was possible. Later on, Northern-blot studies had shown very low expression levels of ...

Ammonia-loving archaea win landslide majority

...ne strain of archaea that uses ammonia as its sole source of energy. Researchers examined soil samples from 12 pristine and agricultural lands across three climatic zones to see if such ammonia-oxidizing microorganisms were present in terrestrial ecosystems as well. "We measured the abundance of the pa...

Possible birthplace of malignant brain tumors identified

...lls are immature cells that serve as the continual source of new brain cells in adults, and PDGF is known as an important regulator of such cells. Also, PDGF has been implicated as a key signaling molecule underlying the formation of brain tumors. PDGF triggers such cell response by plugging into the target...

MIT 'seeing machine' offers hope to blind

...ser of the SLO with light-emitting diodes, another source of high-intensity light that is much cheaper. Like its inspiration, the seeing machine is designed to be used by one eye. The pilot clinical trial of the seeing machine involved visually impaired people recruited from the Beetham Eye Institute. All ...

DOE JGI finishes 100th microbial genome

...cid hot spring in Yellowstone; degrades cellulose, source of high-temperature enzymes. Clostridium thermocellum. David Wu, University of Rochester; Mike Himmel, National Renewable Energy Laboratory. Cellulose degrader. Cytophaga hutchinsonii ATCC33406. Mark McBride, University of Wisconsin Milwaukee. C...

Despite acidity, orange juice could still be a source of foodborne disease

...ed with foodborne disease outbreaks can still be a source of disease, although rare. Public health officials should be aware of this possibility and on guard, say scientists presenting today at the 106th General Meeting of the American Society for Microbiology (ASM) in Orlando, Florida. "The more we find o...

First surveys of Tanzanian mountains reveal 160+ animal species, including new & endemic

...r for several settlements and a town. As a crucial source of water and home to unique and threatened wildlife, World Wildlife Fund considers the Eastern Arc Mountain range and coastal East Africa a conservation priority and works with local communities and partners to protect the natural richness of the reg...

How plants avoid feeling the burn

...sensus school of thought was that carotenoids--the source of the orange pigments in carrots and Vitamin A -- become oxidized, or charged, losing an electron in the process. Now, Fisher and other ASU scientists have found a way to measure for the first time the electrical conductance within such an import...

Super-sized cassava plants may help fight hunger in Africa

...ava plant are edible. Cassava is the primary food source for more than 250 million Africans ?about 40 percent of the continent's population. And the plant's starchy tuberous root is a substantial portion of the diet of nearly 600 million people worldwide. Sayre said he hopes to offer these plants to count...

Radiation-armed robot rapidly destroys human lung tumors

...ny instructs the robotic arm to move the radiation source (a linear accelerator that produces x-rays) in sync with the tumor motion. As a result of the unique real-time tumor tracking capabilities of their upgraded CyberKnife, the researchers have established detailed methods for the safe treatment of lun...

First human study confirms that immune cells can be a primary cause of bone loss in gum disease

...Journal of Pathology, was to identify the cellular source of RANKL in the bone resorptive lesions of periodontal disease. An active periodontal lesion is characterized by the prominent infiltration of B cells and T cells, both of which are major immune lymphocytes. Specifically, the occupancy of 50-60% of ...

A more powerful and efficient engine for rice: the C3-C4 challenge

...3 billion people depend on rice as their main food source each day, including most of the world's poor. "Frankly, we have almost exhausted the traditional methods of increasing rice production, especially considering the environmental challenges we face such as climate change," IRRI Director General Rob...

Mushrooms as good an antioxidant source as more colorful veggies

...an had earlier identified mushrooms as an abundant source of the anti-oxidant, ergothionene. Dubost notes, "Evidence suggests that erogothioneine is biologically very important and, even though the assay used does not show it contributes to total antioxidant activity in the mushrooms, it may significantly ...

DNA: Bacteria's survival ration

...ences, had already shown that DNA is an acceptable source of nutrients for bacteria. The team's latest stud...of Bacteriology, finds that DNA is a critical food source in the battle of the fittest. Bacteria that stay alive just a little longer than their counterparts ...

Iron critical to ocean productivity, carbon uptake

...lowing sand and dust off large deserts are a major source of iron for the world's oceans. "It's like dumping a load of Geritol or some other iron supplement into the water." Three large areas appear limited by a lack of iron, the researchers say ?the southern ocean around Antarctica, the sub-arctic north ...

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