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Tag: "stream" at biology news

Freeze-dried mats of microbes awaken in Antarctic streambed

An experiment in a dry Antarctic stream channel has shown that a carpet of freeze-dried mi...sists of glaciers, open expanses of barren ground, stream channels and permanently ice-covered lakes. The life forms inhabiting the area include microorganism...

Research casts doubt on circulating stem cells

...f a "jack of all trades" circulating via the blood stream throughout the body and repairing, wherever needed, any type of tissue is, unfortunately, a myth. In practice their impact is, at best, minimal. The somatic cells mark genetic traits believe by the body to be no longer needed by sticking a label on ...

Scientists characterize proteome of human cornea

... which indicate that they originate from the blood stream around the cornea and are not produced in the cornea," notes Dr. Enghild. "Our results also showed that proteolysis and post-translational modifications of proteins are common events in the normal human cornea." Among the molecules that the scientis...

Polymer gel can block toxic leakage problem in gene therapy

...ring viruses from being diverted through the blood stream to the wrong targets, the scientists reported in r...ty of tumor cells by being injected into the blood stream but instead must be injected directly into tumors themselves. However, direct intratumoral injectio...

Nanoparticles, nanoshells, nanotubes: How tiny specks may provide powerful tools against cancer

...ice researchers injected nanoshells into the blood stream of mice implanted with colon cancer knowing, based on previous experiments, that the nanoshells would preferentially accumulate in the tumors. This occurs because blood vessels that develop in fast-growing solid tumors are ill-formed and permeable, a...

Storing carbon to combat global warming may cause other environmental problems, study suggests

... said the researchers. "We believe that decreased stream flow and changes in soil and water quality are lik...her than crops or pastures "dramatically decreased stream flow within a few years of planting," the authors wrote. Water use within existing tree plantations...

High resolution 'snapshots' detail dynamics of a cocaine antibody

...This antibody could intercept cocaine in the blood stream before it reaches the central nervous system-stopping the drug cold. Because cocaine has a half life of approximately 30 minutes inside the human body, a cocaine catalytic antibody would basically have to out-run the body's natural metabolism process...

Leave it to salmon to leave no stone unturned

...s, female salmon can industriously churn up entire stream beds from end to end, sometimes more than once, us...nce from spawning impacts virtually all aspects of stream ecology," he says. The female salmon, of course, isn't concerned about all that. She simply wants t...

Study indicates dramatic rise in antibiotic-resistant community-acquired staph infections

...ing skin infections, pneumonia and sometimes blood stream infections. The Centers for Disease Control and Prevention (CDC) reports that staph is one of the leading causes of skin infections in the United States. Previously, scientists have categorized staph into two main types: antibiotic resistant (MRSA...

Pesticides in the nation's streams and ground water

... Plains aquifer system. Although none of the USGS stream sampling sites were located at drinking-water inta..., representing less than 10 percent of the sampled stream sites and about 1 percent of domestic and public-supply wells. However, pesticides may have subs...

APS lecturer shows rare video of 'teacher-student' immune cell interactions in live animal

... recognize the antigen, they hop back in the blood stream and head for the next lymph node. T cells and B cells can live for months, repeating this process and then passing the information on to their successors. The interaction between T cells and dendritic cells in the lymph node changes over time, von An...

Chocolate, wine, spicy foods may be OK for heartburn, Stanford study finds

...ophageal and Small Bowel Disorder Center, said the stream of "very unhappy" patients referred to her clinic by outside doctors caused her to doubt the efficacy of the usual treatment advice. "The patients were on very bland diets and cutting out coffee and wine and everything that they enjoy - and basically...

Bubbles go high-tech to fight tumors

...s actually a two-step process, Bull said. First, a stream of encapsulated superheated perfluorocarbon liquid droplets goes into the body by way of an intravenous injection. The droplets are small enough that they don't lodge in vessels. Doctors image the droplets with standard ultrasound, and once the dropl...

Experimental RNA-based drug kills prostate cancer cells effectively and safely

...vely that the drug can be delivered into the blood stream and still reach the tumor target without being destroyed by the body or causing adverse side effects. ...

Tumor wizardry wards off attacks from the immune system

...aused an increase in T-reg cells in both the blood stream and in lymph nodes leading from the tumors. When the research team blocked a signaling molecule that pancreatic tumors secrete in abundance, T-reg cells were no longer present in the tumor-draining lymph nodes, suggesting that this signaling molecu...

Beaver dams create healthy downstream ecosystems

...verted by beaver dams is forced out of the natural stream channel and spreads across and down the valley for hundreds of meters [yards]. In addition, dams built on the river changed the direction of groundwater flow in the valley. The changes caused water to infiltrate the river banks and flow underground t...

New treatment for severe malaria

...fected blood cells can be transported by the blood stream into the spleen and destroyed. The research group, which is headed by Professor Mats Wahlgren, has now developed a substance that prevents infected blood cells from binding in this way. The substance also releases blood cells already bound. Using t...

Scientists solve 30-year-old mystery of mutant mouse's kidney woes

...urine, where aqp2 can extract water from the waste stream for recirculation in the body. In the mutant mice, though, aqp2 was scattered around the collection duct cells. "The protein is still there, but it's not in the right place," Chen says. "To make sure this was the cause and not just a result of the ...

Cougar predation key to ecosystem health

...species of water-loving plants that help stabilize stream banks, provide food-web support, and protect flood... as climate fluctuations or human interventions to stream channels, but concluded that those impacts could not have caused the enormous loss of trees and asso...

Cell wall of pneumonia bacteria can cause brain and heart damage

...l of Immunology. These findings explain why blood stream infection with S. pneumoniae commonly leads to temporary impairment of heart function, and they suggest a way to prevent that from occurring, according to Elaine Tuomanen, M.D., chair of the St. Jude Department of Infectious Diseases. S. pneumoniae i...

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