Tag: "nitrogen" at biology news

Landmark agreement between Samoa and UC Berkeley could help search for AIDS cure

...freeze living cells from the mamala tree in liquid nitrogen so that extraction of the perishable RNA can be conducted in the laboratory. Then begins the process of tracking down the enzymes that actually build the molecule Prostratin. Once Keasling has pinpointed the key enzymes and cloned their genes, he pl...

Scientists sequence genome of kind of organism central to biosphere's carbon cycle

... ever suspected," Armbrust says. A urea cycle is a nitrogen waste pathway found in animals and has never befor... enzymes that may help to reduce its dependence on nitrogen from the surrounding waters. The genome work also shed additional light on how this diatom species ...

Study: Emission of smog ingredients from trees is increasing rapidly

...ss of gasses known as NOx (various combinations of nitrogen and oxygen), which are almost entirely man-made. The ozone-producing reaction happens most readily in hot weather, which is also when trees produce the most VOCs. Further studies at Princeton and the federal Geophysical Fluid Dynamics Lab at Princeto...

Alaska scientists find Arctic tundra yields surprising carbon loss

...ion, researchers measured the amount of carbon and nitrogen in plants and soils from plots of tundra that have...t material, releasing carbon to the atmosphere and nitrogen to plants. Nitrogen limits plant growth in most terrestrial ecosystems, said Bret-Harte" "What's rea...

Pollutant causes delayed flowering in plants

...tirely possible that global pollution by oxides of nitrogen could delay plant flowering worldwide," Pei said. Pei and his colleagues began their studies by exposing the seedlings of the mustard plant, scientific name Arabidopsis, to a chemical that produced nitric oxide. The researchers found that such exposu...

Cell's gatekeeper for ammonia revealed in unprecedented detail

...ll while providing a way for the cell to transport nitrogen in this form. Ultimately nitrogen is essential for building proteins and other processes." Bacteria and yeast, he pointed out, can sur...

New research shows air pollution can reduce children's lung function

...archers also tracked levels of air pollutants like nitrogen dioxide, acid vapor, elemental carbon, and particulate matter in the 12 Southern California communities where the children lived. The study encompassed some of the most polluted areas in the greater Los Angeles basin, as well as several less-polluted...

NASA satellites detect 'glow' of plankton in black waters

... water" events. Dark-colored river runoff includes nitrogen and phosphorus, which are used as fertilizers in agriculture. These nutrients cause blooms of marine algae called phytoplankton. During extremely large phytoplankton blooms where the algae is so concentrated the water may appear black, some phytoplan...

What actually influences air pollution over the Indian Ocean?

...he Max Planck Institute for Chemistry have studied nitrogen oxides pollution over the Indian Ocean. They showe...2000 and global model simulations, they focused on nitrogen oxide pollution during the periods between the summer and winter monsoons - the monsoon transition p...

Unicellular organisms contribute more nitrogen to ocean that reported earlier

...panses of the open ocean are getting a substantial nitrogen influx from an abundant group of unicellular organisms that "fix," or chemically alter, nitrogen into a form usable for biological productivity. First identified about five years ago, these organi...

Meteorites supplied Earth life with phosphorus

...toms in bacteria. The numbers for carbon atoms and nitrogen atoms, respectively, per single phosphorus atom are 680 and 230 in the cosmos, 974 and 633 in the oceans, and 116 and 15 in bacteria. "Because phosphorus is much rarer in the environment than in life, understanding the behavior of phosphorus on the e...

The first engineering of cell surfaces in living animals

...p called an azide (a class of compounds with three nitrogen atoms) and a phosphine (a molecule containing a phosphorus atom). Neither azides nor phosphines have harmful effects -- indeed they are useful in some drugs: the A in AZT, azidothymidine, is for azide -- but they rapidly react with each other under p...

Excess levels of nitrogen, phosphorus linked to deformed frogs

... Eutrophication is caused by higher phosphorus and nitrogen (prime components of agricultural fertilizer) leve... a common snail that thrives on high phosphate and nitrogen levels. This particular kind of snail, the ramshorn snail, found in pet stores, is the snail needed...

Goals unlikely to protect Gulf of Mexico shrimp industry

...e human-caused? Will a proposed goal of 30 percent nitrogen load reduction be sufficient to reduce the zone to...f the journal Estuaries, found that the 30 percent nitrogen load reduction will not likely shrink the dead zone to the desired 5,000 square kilometers. Accordin...

Plant respiration not just an evolutionary leftover, study shows

...otorespiration enables the plant to take inorganic nitrogen in the form of nitrate and convert it into a form ...ant's shoot slows down. Eventually, a shortage of nitrogen will curtail the plant's growth. "This explains why many plants are unable to sustain rapid growth ...

In the obese, metabolic adaptations post-weight loss lead to regaining of shed pounds

...were obtained by indirect calorimetry with urinary nitrogen analysis and normalized to fat mass (FM) and fat free mass (FFM) acquired by dual energy x-ray absorptiometry. Results This study provides insight as to how the metabolic state of an obesity-prone rat changes from the pre-obese state to the obese s...

Next best thing: wood chip bedding for cattle

...oxide emission accounted for less than 1% of total nitrogen loss while methane emission accounted for less tha...ing added benefit of using wood chips is that less nitrogen is lost during composting. Typically, nitrogen is lost to the atmosphere as ammonia. Volatile losses...

Increasing ozone over the Atlantic ocean

...n in the 1940s, an area where traffic emissions of nitrogen oxides (NO and NO2) efficiently promote photochemical air pollution. The nitrogen oxides, released from the combustion of fossil fuels and also by biomass burning, act as catalysts o...

Some plants may compensate for herbivore damage by stimulating nutrient release in the soil

...d micro-organisms in the soil to release inorganic nitrogen (which is potentially readily available for plant ... increased rate. Beech responded to the increased nitrogen availability by producing larger leaves with a greater photosynthetic capacity, compensating for the...

Model shows long-held constant in ocean nutrient ratio may vary as ecological conditions change

...xide, a greenhouse gas. Phytoplankton depend upon nitrogen and phosphorus to grow and, ultimately, replenish ...take. Ribosomes assemble two proteins that take up nitrogen and phosphorus. Chloroplasts gather energy from the sun. "When competing to the very end, then the ...

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