Tag: "stream" at biology news

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

...uding one local species the group collected from a stream near Fresno. Perhaps mutations in the two other ge...ter habitat those fish prospered and populated the stream or lake with similarly armorless offspring. Kingsley said this work is part of a larger study to un...

Why do insects stop 'breathing'? To avoid damage from too much oxygen, say researchers

...ystem, it does so for only a very short time. In a stream of air with high oxygen on the other hand, the respiratory system opens briefly and then closes firmly for a long time. "In other words, insects are actively keeping oxygen out and doing it in a way that shows they know how to measure oxygen," Bradle...

White blood cell waste disposal system plays critical regulatory role

...ced in the bone marrow and released into the blood stream where they migrate out of the blood and roam the body in search of potentially harmful foreign substances. Neutrophils have a short lifespan and often die via a programmed cell death pathway called apoptosis within a matter of hours. Dying neutrophil...

World-first Living Donor Islet Cell Transplant A Success; Procedure Offers Promise For Diabetics

...ely damaged by toxins which circulate in the blood stream after brain death." "Our expectation is that these islets from near-perfect organs will work better, although it's too early to tell," he says. The recipients use the same drugs to prevent organ rejection as are used in the Edmonton Protocol. Dr. ...

No relief for Pacific Northwest drought

...one obvious implication, the researchers said, but stream flows, fisheries, agriculture, recreation and industry may all be affected. According to Lenihan, the major storms that inundated southern California and other parts of the Southwest this year have significantly reduced the fire risks in that region...

50-year-old Mystery Solved: Protein Tags Regulate Key Ion Channel

...nzyme removed the SUMO tag, however, ions began to stream through the channel. Understanding the role of sumoylation allowed the team to study the K2P1 channel for the first time. The channel is open at rest, the researchers found, and closed when the SUMO tag is attached. When it is closed, potassium ions...

Reservoirs may accelerate the spread of invasive aquatic species, researchers say

...egion and that reservoirs typically replace varied stream habitats with habitats more similar to each other. Compared to natural lakes, reservoirs are usually shallower, more connected to other water bodies, and more laden with suspended and dissolved solids; they also have a higher and more variable flushi...

White Blood Cell 'Waste Disposal' System Plays Critical Regulatory Role

...ced in the bone marrow and released into the blood stream where they migrate out of the blood and roam the body in search of potentially harmful foreign substances. Neutrophils have a short lifespan and often die via a programmed cell death pathway called apoptosis within a matter of hours. Dying neutrophil...

To sea or not to sea: When it comes to salmon sex, size sometimes doesn't matter

...sh that have gone to sea but don't return to their stream of origin to spawn, instead straying to some other...ysterious, Quinn says. Do strays identify the home stream but then go elsewhere? Do they have poorer memory or sensory capabilities and so stray out of ignora...

Putting ecology back into river restoration

...ation of fresh waters, and the fact that river and stream restoration has become a booming enterprise, it is... to agree on what constitutes successful river and stream restoration." Palmer and her colleagues say that the success of river restoration should be judged a...

Gladstone investigators discover how resting T cells avoid HIV infection

...es. Roughly 95 percent of CD4 T cells in the blood stream exist in a resting, inactive state, awaiting the appearance of their specific antigen. When they detect its presence, they spring into action -- growing and dividing, releasing cytokines (proteins that the immune system uses to communicate between ce...

New strategies to reduce hospital-aquired infections

... biofilm contaminants separate from the main water stream and spread by air currents in all directions. Some of these contaminants are inhaled as aerosols (tiny water droplets containing microbes) or condensed on surfaces where they can be touched. Many of the bacteria found in biofilm, such as legionella ...

Distributed Basic Local Alignment Search Toolkit (W.ND-BLAST)

... biofilm contaminants separate from the main water stream and spread by air currents in all directions. Some of these contaminants are inhaled as aerosols (tiny water droplets containing microbes) or condensed on surfaces where they can be touched. Many of the bacteria found in biofilm, such as legionella ...

A virus-like hitchhiker may trigger bacterial meningitis

...ains -- occasionally find their way into the blood stream and then into the brain, where they trigger a potentially fatal immune response (meningitis). Tinsley and colleagues have now discovered that many hyperinvasive stains of N. meningitidis contain a bacteriophage (a virus-like organism that infects ba...

Assessing the Amazon River's sensitivity to deforestation

...archers are investigating the causes of changes to stream hydrology and biogeochemistry. The Amazon, one of... included the first detailed representation of the stream network throughout the 6 and 1/2 million km2 basin, and by itself, took 5 people over nine months to...

Microreactor efficiently regenerates cofactors for biocatalysis

...ic channel in which two liquid streams (a reactant stream and a buffer stream) merge and flow laminarly betw...wo streams, the researchers can focus the reactant stream close to the cathode, and a normally unfavorable reaction equilibrium is driven into the desired dir...

Past droughts geographically widespread in the West, according to tree-ring data

...illed the reservoirs on the Salt and Verde rivers, stream flows into the Salt and Verde have been below normal for eight of the last 10 January-through-May runoff seasons. Phoenix-based SRP is the largest provider of water to the greater Phoenix metropolitan area. The research was funded by SRP, the city ...

Researchers predict infinite genomes

...he researchers discovered a surprisingly continual stream of diversity. Each GBS strain contained an average of 1806 genes present in every strain (thus constituting the GBS core genome) plus 439 genes absent in one or more strains. Moreover, mathematical modeling showed that unique genes will continue to e...

Retina adapts to seek the unexpected, ignore the commonplace

...tion provides a means of stripping from the visual stream predictable and therefore less newsworthy signals. For example, Meister says, in visual environments such as forests or fields of grass with many vertical elements but only rare horizontal features, the retina adjusts to suppress the routine vertica...

Promising therapies for haemophilia & heart disease

...ls" Measurement of P-selectin levels in the blood stream may provide a new diagnostic tool to identify people at risk of heart disease and stroke. Levels above baseline could alert clinicians to potentially fatal events. Several pharmaceutical companies are now searching for compounds that target P-selecti...

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