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Tag: "nutrient" at biology news

Growth in the sea comes down to a struggle for iron

...ains unanswered is why the diatoms showed signs of nutrient stress before the iron and other nutrients were used up. Wells and his colleagues think they may know. For clues, they have looked to a discipline that is far removed from the sea. Soil contains lots of iron, but most of it stays locked up in minera...

The secret to longevity in tubeworms

...ived of all animals, but how it obtains sufficient nutrient ?in the form of sulfide - to keep going for this long has been a mystery. In a paper just published in the premier open-access online journal PLoS Biology, Erik Cordes and colleagues now provide a solution: by releasing its waste sulfate not up into ...

Iron Deficiency Sparks Dramatic Changes In Gene Expression

... inside a cell when itis deprived of the essential nutrient iron. Iron is found abundantly inred meats, shellfish dried fruits, whole grains, spinach, seeds andother foods.Their study in yeast cells demonstrated that iron-starved cellspreserve the little iron they possess by shutting down the major ironusers ...

Placenta Is A Rich Source Of Blood Stem Cells

...lacenta, which has been seen as simply a place for nutrient exchange and waste removal between mother and fetus. But rather than merely providing nutrients, Orkin says, the placenta may also provide an ''infusion'' of blood stem cells to the fetus. ''This research reveals a new organ for blood development,''...

Highly adaptable genome in gut bacterium key to intestinal health

... the bacterial species to survive rapidly changing nutrient conditions but also helps maintain the functions a... an elaborate mechanism for sensing changes in its nutrient landscape and quickly changing its dietary preferences so that it can use whatever is most plentiful...

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

... these interesting ideas about foxes and birds and nutrient chains, and I thought we should do some studies to... fox-infested islands. The resulting difference in nutrient inputs was reflected in soil phosphorus levels that were more than three times higher on fox-free is...

Scientists discover unique microbe in California's largest lake

...e original host. In the open ocean, whichitself is nutrient poor, the host animal or plant provided anutrient-rich environment with relatively high amounts of infraredlight; in the Salton Sea, the waters themselves create a comparableniche. Wood thinks that the high availability of nutrients in thewaters of t...

Iron exporter revealed that may explain common human disorder

... in all tissues except those critical for maternal nutrient transfer survived but quickly became anemic after birth due to iron deficiency in the blood. Examination of the animals' intestine, liver, and spleen revealed an accumulation of iron within cells, indicating an inability of cells to release iron once...

Transgenic plants remove more selenium from polluted soil than wild plants, new tests show

... it is chemically similar to sulfate, an essential nutrient for the plant. Gary S. Banuelos, a soil scientist with the USDA's ARS and co-lead author of the paper, directed the field tests, which were carried out in Fresno County. The three types of transgenic plants and the wild-type control plants were tra...

Researchers identify protein crucial for survival of Lyme-disease bacterium

..., Bb bacteria normally utilize blood as their main nutrient source, just as the tick does," said Dr. Michael N...mperature and acidity signal the bacteria that the nutrient is present, triggering the bacteria to replicate in large numbers and migrate to the tick's salivary...

NASA study finds snow melt causes large ocean plant blooms

... bacteria. These bacteria convert a nitrogen-based nutrient readily consumable by plants in seawater, called nitrate, into forms of nitrogen that most plants cannot use. One form of nitrogen that plants cannot consume is nitrous oxide, also known as laughing gas. In the atmosphere, nitrous oxide is 310 times...

NIH Researchers Discover How Insulin Allows Entry of Glucose Into Cells

...ane Alexander, M.D. Glucose, a simple sugar, is a nutrient that cells need to survive, explained the study’s corresponding author, Joshua Zimmerberg, M.D., Ph.D., chief of NICHD’s Laboratory of Cellular and Molecular Biophysics. Glucose is ferried through the cell’s outer covering, or membrane, by a family o...

Physiological effects of reduced gravity on bacteria

...sistance and the ability to persist under very low nutrient conditions), may contribute to the success of these water system bacteria. ...

Anammox bacteria produce nitrogen gas in oceans' snackbar

...gas to form new nutrients that can be fed into the nutrient cycle again. In the article in PNAS, researchers ... microbiological methods involving high resolution nutrient profiles, experiments with stable isotope labeled nutrients, depth profiles of unique membrane lipid...

Advancements In Genomics Foster Deep Sea Discoveries

...ative process, adaptations to electron, proton and nutrient transport across membranes and a large number of previously unknown genes. Scripps has been a pioneer in researching life in the deep ocean abyss for more than 50 years. Bartlett’s studies follow the pioneering work in the 1950s of Claude ZoBell, wh...

Oceans more vulnerable to agricultural runoff than previously thought, study finds

...he Gulf of California contains some of the highest nutrient concentrations in the oceans and sustains highly elevated rates of biological productivity." In the gulf, wind-driven upwellings regularly bring nitrogen and other nutrients from the seafloor to the surface, stimulating the rapid reproduction and gr...

Oldest fossil human protein ever sequenced

...y have been an advantage to these primates if this nutrient was missing from their diets regularly. This research opens up the exciting possibility of extracting and sequencing protein from other fossils, including earlier humans, as a means of determining the relationships between extinct and living species...

MUHC researchers make cancer target breakthrough

...nvolved in the synthesis of methionine--a critical nutrient necessary for growth of cancer cells," explains Dr. Rima Rozen, principal investigator of the new study, and Deputy Scientific Director of the MUHC Research Institute. "By inhibiting the gene's function, we were able to slow the growth of tumors." R...

Researchers develop assay that could be applied to drug screening

...lar activities including receptor down-regulation, nutrient uptake and maintenance of signal transmission across nerve cell junctions. Mis-regulation of CME has been implicated in some types of cancer and neuro-degenerative disease and the protein machinery of CME has been co-opted by several viruses, includi...

Currents could disrupt ocean food chain

...ly of phytoplankton at the surface, forming a rich nutrient source at the bottom of the marine food web. Ther...ture changes, which coincide with changes in ocean nutrient concentrations measured in deep-sea sediment cores. "One full oscillation of these switches took 1,...

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