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Monday, September 29, 2014

ScienceDaily: Top Environment News

ScienceDaily: Top Environment News

While the Arctic is melting the Gulf Stream remains

Posted: 28 Sep 2014 01:13 PM PDT

The melting Arctic is not the source for less saline Nordic Seas. It is the Gulf Stream that has provided less salt. A new study documents that the source of fresher Nordic Seas since 1950 is rooted in the saline Atlantic as opposed to Arctic freshwater that is the common inference.

Human genome was shaped by an evolutionary arms race with itself

Posted: 28 Sep 2014 12:47 PM PDT

An evolutionary arms race between rival elements within the genomes of primates drove the evolution of complex regulatory networks that orchestrate the activity of genes in every cell of our bodies, researach shows. The arms race is between mobile DNA sequences known as 'retrotransposons' (a.k.a. 'jumping genes') and the genes that have evolved to control them.

Bacterial genome important to fuel and chemical production sequenced

Posted: 26 Sep 2014 06:35 PM PDT

Researchers sequence the entire genome of the Clostridium autoethanogenum bacterium, which is used to sustainably produce fuel and chemicals from a range of raw materials, including gases derived from biomass and industrial wastes.

If trees could talk: Forest research network reveals global change effects

Posted: 26 Sep 2014 06:13 AM PDT

Permafrost thaw drives forest loss in Canada, while drought has killed trees in Panama, southern India and Borneo. In the U.S., in Virginia, over-abundant deer eat trees before they reach maturity, while nitrogen pollution has changed soil chemistry in Canada and Panama. More than 100 collaborators have now published a major overview of what 59 forests in 24 countries teach us about forest responses to global change.

Cow behaviour changes in response to deterioration in health

Posted: 26 Sep 2014 05:58 AM PDT

When a cow develops mastitis, her behavior changes and the quality of her milk deteriorates. The stockperson can detect the signs of inflammation in the milk when the cow is milked, but is it possible to recognize the signs of this diseases in other ways and even earlier?

The dangers of teens using weed

Posted: 25 Sep 2014 12:06 PM PDT

Whether states should legalize marijuana for recreational and medical use is a hot topic across the country. As the debates continue a potentially dangerous environment is being created where more preteens, teens and young adults are beginning to use the substance with the feeling that it is safe.

Protein controlling gut's protective force field identified: Immune-system receptor encourages growth of bacterial shield during illness

Posted: 25 Sep 2014 11:11 AM PDT

A sugary force field is activated in the gut when our defenses are down to encourage the growth of helpful bacteria and fight over-colonization by harmful micro-organisms, scientists have discovered. Scientists have found that mice who have had the gene IL-22RA1 gene removed are more susceptible to infection because they cannot produce a receptor protein that makes the cells produce sugars. Normally this process coats the surface of the intestine with a sugary substance that encourages the growth of bacteria and the restoration of balance. With the gene removed, the body was unable to produce this force field.

Goats better than chemicals for curbing invasive marsh grass

Posted: 25 Sep 2014 10:27 AM PDT

Herbivores, not herbicides, may be the most effective way to combat the spread of Phragmites australis, one of the most invasive plants now threatening East Coast salt marshes. A new study finds allowing small herds of goats and other livestock to graze in severely affected marshes can reduce phragmites cover from 94 percent to 21 percent and help restore natural species diversity, marsh function, and valuable shoreline views of the water.

Gauntlet of obstacles facing migrating pronghorn in greater Yellowstone

Posted: 25 Sep 2014 10:26 AM PDT

One of North America's last remaining long-distance land migrations, better known as the Path of the Pronghorn, is being threatened by a mosaic of natural gas field development, highway traffic, and fencing in the upper Green River Basin, according to scientists who used a model traditionally applied to identify resource related stopovers for migrating animals in order to identify impediments to migration of pronghorn.

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