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Tag: "revealed" at biology news

High dopamine transporter levels not correlated with ADHD

...he level of dopamine transporters. The PET scans revealed that ADHD subjects had significantly fewer dopamine transporters than control subjects in the nucleus accumbens, an area of the ventral striatum that is one of the main reward centers in the brain. In a dorsal striatum region known as the putamen, wh...

New genetic analysis forces re-draw of insect family tree

...en re-drawn following a genetic analysis which has revealed new relationships between four major groups of insects. Scientists have found that flies and moths are most closely related to beetles and more distantly related to bees and wasps, contrary to previous theory. The findings are published in the...

Embryo tests give parents the choice

...cts or being miscarried. However, the survey also revealed that applications of PGD have broadened to include...specifically on the uses of PGD in IVF clinics. It revealed that almost one-quarter of US clinics use PGD to select an embryo that would be an immunological mat...

How nature tinkers with the cellular clock

... particular sites. A closer look at these proteins revealed that changes in the control of gene expression often go together with changes in the regulation of the corresponding protein. "To our surprise, we found that these two different mechanisms of temporal control evolve together in a coordinated fashio...

Inheriting a tendency to brain infection

...ologist Laurent Abel of the Necker Medical School, revealed that a significant proportion of patients with herpes simplex encephalitis had parents who were blood relatives --often first or second cousins--and were therefore at higher than normal risk of inheriting two copies of a faulty gene. In 2005, Casa...

Bacterial 'switch gene' regulates how oceans emit sulfur into atmosphere

...s, which supported the research. "The research has revealed the previously hidden role that marine microbes play in the global sulfur cycle." The researchers discovered that microscopic plankton that fall under the Roseobacter and SAR11 organism groups are the primary plankton involved in directing DMSP awa...

Genetic 'roadmap' charts links between drugs and human disease

...ch "word" and potential functional connections are revealed through a rank-ordered list of reference compounds in the database that have matching signatures. One of the surprising results to emerge from the Connectivity Map involves gedunin, a plant derivative that, despite a long history of medicinal use, ...

Eat less, weigh more? Enzyme makes lean mice 'susceptible' to dietary fat

...nt less when fed a low-fat diet. Further analysis revealed that when deprived of food for four hours prior to feeding with standard laboratory mouse chow, the knockout mutant mice ate about 25 percent less food than their normal siblings. Therefore, the researchers concluded, CPT1c must play a role in feedi...

Scientists use gene signatures to match cancer and other diseases with potentially effective drugs

...ALL. Moreover, the comparison of gene signatures revealed that rapamycin's effectiveness was due in part to its action on a molecule that causes cancer cells to self-destruct. The method also enabled researchers to match up a pair of natural products, known as celastrol and gedunin, with a mechanism by wh...

Epstein-Barr virus might kick-start multiple sclerosis

...ally responded to EBNA1. A series of experiments revealed a pattern among the EBNA1 T cells in MS patients that was not seen in the healthy volunteers. "We saw a dual effect--not only was there an increased number of EBNA1 responsive T cells, but these T cells proliferated to a greater extent when they were...

Nice guys do finish first in lizards' evolutionary race

...ary puzzle that we needed to solve." Gene mapping revealed that the male blue-throats who buddied up are not even remotely related ?yet still share many genes. Somehow, McAdam said, the altruistic lizards know they're working to pass on their genes, even though their partners aren't family. The tag-team appr...

High-tech research shows cocaine changes proteins and brain function

... individuals. Analysis of thousands of proteins revealed differences between the two groups in the amounts of approximately 50 proteins, most of which correspond to changes in the ability of the brain cells to strenghten their connections and communicate with one another. Understanding the coordinated i...

Ozone recovering, but unlikely to stabilize at pre-1980 levels, says study

...ting plant growth. A closer inspection, however, revealed that BIN2 resides in multiple compartments of a cell, including the nucleus, and it is there--not in the cytoplasm--that BIN2 meets up with BES1 and prevents it from activating growth genes. "All of a sudden the 'BES1 shuttle model' no longer made se...

Salk scientists untangle steroid hormone signaling in plants

...ting plant growth. A closer inspection, however, revealed that BIN2 resides in multiple compartments of a cell, including the nucleus, and it is there--not in the cytoplasm--that BIN2 meets up with BES1 and prevents it from activating growth genes. "All of a sudden the 'BES1 shuttle model' no longer made se...

Liquorice cancer care

...Zhi Yuan and his team at Nankai University, China, revealed that the liquorice compounds, glycerrhetinic acid and glycerrhizic acid, preferentially accumulate in the liver. And when attached to anti-tumours drugs, they are more effective tissue-specific drug carriers than the traditionally used antibodies and...

Nanotechnology being used to improve biocompatibility of human prosthetics and implants

...liferation of the osteoblast cells. The study also revealed that the dissolution of the Ca/P-rich phases into the culture medium might promote the proliferation/differentiation of the osteoblast cells. ...

Brain's 'gambling circuitry' identified

...fore the second card, they were assessing the risk revealed by the first card. The researchers based this approach on studies by other researchers of such processes in primates. Quartz and colleagues found they could distinguish brain regions that specifically responded to either reward expectation or risk....

New research finds surveys of larval-stage organisms effective for measuring marine biodiversity

...n mature species of mantis shrimp. The comparisons revealed numerous new varieties of shrimp that are completely unknown in their adult forms. "Our results show that biodiversity in mantis shrimp in these regions is estimated to be at least 50 to 150 percent higher than presently believed," said Barber. "Gi...

Precision biochemistry tracks DNA damage in fish

... results correlated well with earlier research and revealed similar damage to liver DNA (more likely tied to the fish's food) and gill DNA (more probably reflecting pollutants in water). The results suggest that these DNA lesions, and others like them, can be used as very sensitive biomarkers to provide a di...

Global warming may have damaged coral reefs forever

...arted to happen soon after 1998. The survey also revealed that species diversity of the fish community had decreased by 50 per cent in the heavily impacted sites. Reduced biodiversity results in a more fragile and less stable ecosystem. Smaller fish have reduced in number more quickly than larger species...

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