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Tag: "water" at biology news

Amphibians in losing race with environmental change

... Many amphibians lay their eggs in shallow, open water in direct sunlight to provide a more oxygenated en...change has occurred too rapidly. In the past, water was reasonably pure and clean. But increased "eutrophication" of freshwater ponds due to use of mode...

Alien plants attack using 'resource conservation' as weapon, researchers say

...rowth Plants depend on sunlight, nutrients and water to survive, and a shortage of any one of these will restrict how fast they can grow. When plants use these inputs more efficiently, however, they can photosynthesize-and thus grow and spread-faster, according to Funk and Vitousek. To compare the r...

8 plants from South Africa may hold potential for treating high blood pressure

...al was suspended in either a methanol or distilled water solution for 48 hours. Each solution was subsequently filtered and the filtrate was left to air dry resulting in the specific test compound. ACE activity was determined using a flourimetric method with Hip-His-Leu as a substrate. The fluorescence of ...

An ancient bathtub ring of mammoth fossils

...ton, where the elephantine corpses came to rest as water receded from the temporary but repeatedly formed a...e, releasing huge volumes—up to 500 cubic miles—of water in an instant. The dam would slowly reform creating a new Lake Missoula, and the cycle would repeat....

Premature births may be linked to seasonal levels of pesticides and nitrates in surface water

...en pesticides and nitrates measurements in surface water were highest (April-July) and were lowest when nit... resident. Pesticide and nitrate levels in surface water were also highest in May-June and lowest in August –September, according to the U.S. Geological Surv...

'Short-circuit' found in ocean circulation

...how that much of the overturning circulation - how water moves and mixes vertically - around Antarctica tak...ssolves in the deep sea and a plume of this marked water travels down the coast of Chile. It is injected at depth into the Antarctic current on the Pacific s...

Hepatitis E takes a piggyback

...d vets. The disease can be transmitted by drinking water contaminated with faeces as well as by eating pork: uncooked wild boar liver is one Japanese delicacy that frequently leads to infection. Suckling pigs don't contract the virus in their first 30 days, because a maternal antibody protects them. Vac...

Palau's coral reefs show differential habitat recovery following the 1998 bleaching event

... from a 1998 "bleaching" event, caused by high sea water temperatures. "The rare piece of good news in the ...ly subjected to repeated thermal stress events and water temperatures considerably higher than historical averages. Using underwater digital v...

Dinosaur hearing, listening to muscle noise, quieter cubicles

...f mammals evolved as they made the transition from water to land (2aAB3), the identification of over 20 specialized structures that may have enhanced the hearing of various fish species during their evolution (2aAB1), and the notable features of 36 cat species' middle ears, which may provide clues on the e...

Scientists discover new life in the Antarctic deep sea

...e Southern Ocean - the source for much of the deep water in the world ocean ?are likely to be related to an... A key question for scientists is whether shallow water species colonised the deep ocean or vice versa. The research findings suggest the glacial cycle of ...

Hexavalent chromium in drinking water causes cancer in lab animals

...manufacturing and have been found in some drinking water sources. Male and female rats and mice were giv...s of sodium dichromate dihydrate in their drinking water ranging from 14.3 mg/l to 516 mg/l for two years. The lowest doses given to the animals in the study...

Study warns deep-sea mining may pose serious threat to fragile marine ecosystems

...othermal vent systems that spew 350-degree Celsius water into the frigid deep-sea environment, and support ...rge considerable amounts of fine sediment into the water column—a serious problem for vent organisms that feed by filtering the water in their habitat. T...

A new portable biosensor detects traces of contaminants in food more quickly and cheaply

...sfully to detect pesticides in samples of drinking water and commercial orange juice, as well as to detect ...ne, often causes contamination both of underground water and overground water. For this reason food safety agencies have established control measures to prev...

Fused nasal bones helped tyrannosaurids dismember prey

... animal. The T. rex just blows everyone out of the water when it comes to strength. "The fused nasal bones had been observed before, but no one but us and Emily Rayfield of Bristol hypothesized that the fusion enhanced the skull strength. Now we know it did." ...

Cornell lab confirms deadly fish virus spreading to new species

...it minnows, contaminated fishing equipment or live water wells in boats, boating activities and ballast wat...require that bait fish be used in the same body of water from which they were collected unless they have been tested. In Wisconsin, new emergency rules prohi...

Discovery of 'master switch' for the communication process between chloroplast and nuclei of plants

...g how plants pass signals of stress due to lack of water or salinity from chloroplast to nucleus. They know that chloroplasts ?the cellular organelles that give plants their green color ?have at least three different signals that can indicate a plant is under stress. Given the challenges the environment w...

Fish extinctions alter critical nutrients in water, study shows

..., for example, rely on fish to cycle back into the water such nutrients as nitrogen and phosphorus, which are otherwise locked up in animal or plant cells. Fish excrete dissolved nutrients back into the water, making them available to algae, which need them to grow. The study, published in the Feb. 27 is...

Paper challenges 1491 Amazonian population theories

... stray very far from home, or from local bodies of water for several thousands of years. We looked at clusters of lakes and landscapes where people lived, and asked, did they leave their homesite to farm around other nearby lakes? No they didn't. These findings argue for a very localized use of Amazonian f...

Ancient genes used to produce salt-tolerant wheat

...as well as helping to stabilise soil from wind and water erosion....

Mutation improves memory, may lead to memory-enhancing pill

...howed an improved talent for spatial learning in a water maze test. In the test, the mice were trained to swim to a hidden platform. After several days of training, the altered mice were able to find the platform significantly faster than normal mice could, they reported. "For example, if a person we...

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