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Tag: "loss" at biology news

Bone Density Recovers After Teens Stop Injected Contraceptive

...ed under the brand name Depo-Provera, experience a loss of bone mineral density during the time they are u...fter a woman stops breast feeding. “The potential loss of bone density is one consideration of the many that go into a woman’s choice of contraceptive meth...

Ophthalmologists implant five patients with artificial silicon retina microchip

...chips in the eyes of five patients to treat vision loss caused by retinitis pigmentosa (RP). The implant i...s the retina seems a logical step in replacing the loss of photoreceptor cells of the retina. If the implant is tolerated well and is able to successfully s...

A new study examines how shared pathogens affect host populations

..., an epidemic on one species may result because of loss or reduction in the abundance of species in the community, without any numerical or genetic change in the host or pathogen. Studying only the target species or the abiotic environment would not reveal the cause of the epidemic. Their results have not...

Variation in women's X chromosomes may explain differences among individuals, between sexes

... expected severity of symptoms associated with the loss or aberration of particular portions of the X chromosome will depend on the number of active genes normally contained within that segment, he explained. The findings also highlight key differences between female and male genomes, according to the re...

Pulsating ultrasound enhances gene therapy for tumors

... of pulsed-HIFU include no scarring, limited blood loss and infections, reduced risk of other complications, shortened recovery time, significant reduction in costs and the potential for many procedures to be done on an outpatient basis. ...

Iron exporter revealed that may explain common human disorder

...seen in those with hemochromatosis may stem from a loss of control over iron export through ferroportin, the researchers said. "Iron is essential in the body and abundant in the environment, but it's also very reactive and damaging when in excess," said Nancy Andrews, senior author of the study. "Mammals...

Nanoscale Diagnostic Sets Sights on Alzheimer's

...good bet that the very earliest stage of AD memory loss begins when ADDLs attack key synapses in the brain. We predicted some of these ADDLs would leak into the cerebrospinal fluid, but until now we couldn't detect them. Thanks to the extraordinary sensitivity of the BCA it's been possible to validate the...

Biodiversity hotspots identify conservation priorities

...xample is Southeast Asia's Sundaland, whose forest loss has been driven largely by extensive commercial logging and agricultural projects. On the other hand, relatively little forest has been lost in the Atlantic Forest, and Madagascar looks set to hold steady following President Marc Ravalomanana's recen...

Low level of extinction during ice age linked to adaptability

...ring the late Paleozoic ice age were caused by the loss and lack of recovery of those that had existed in narrow latitudinal ranges." Powell believes that those brachiopods that existed within narrow latitudinal ranges became victims of the extremes in the annual minimum and maximum temperatures that wer...

Key mechanism in genetic inheritance during cell division identified

...bind to a microtubule spindle to avoid the gain or loss of chromosomes by each of the daughter cells. How this works, however, was unknown. To find answers, the Berkeley researchers used a purified, reconstituted Dam1 complex, obtained from genetically engineered E. coli bacteria, and compared its effect...

New insight into regulation of blood stem cells

... using traditional gene disruption methods because loss of genes thought to be critical for this process often results in embryonic death, making it impossible to study the role of the gene of interest in mature animals. Dr. Michael P. Cooke and colleagues from the Genomics Institute of the Novartis Rese...

Alzheimer's cognitive decline slowed

...of growth factor gene delivery. Cholinergic neuron loss is a cardinal feature of Alzheimer's disease, a progressive brain disorder affecting memory, learning, attention and other cognitive processes. "If validated in further clinical trials, this would represent a substantially more effective therapy tha...

Scientists identify molecule that regulates well-known tumor suppressor

...le it is clear that without normal PTEN there is a loss of PKB/Akt inhibition that can lead to tumor growth, sometimes cancers with normal PTEN also exhibit abnormally high levels of PKB/Akt activity. In a quest to determine what molecules regulate normal PTEN, Dr. Tak W. Mak from the Ontario Cancer Insti...

Solutions that reduce death of marine life reeled in by International Smart Gear Competition

...dreds of millions of dollars a year because of the loss of juvenile fish and non-target fish to bycatch. This team developed a system of angled metal grids and net meshes that catches and sorts mature shrimp and finfish while allowing juvenile shrimp and fish to swim away unharmed. Sorting mature shrimp a...

Protein That Promotes Survival Of Stem Cells Might Be Key To Poor Leukemia Prognosis

...In contrast, liver cells were unaffected following loss of Mcl-1, demonstrating that Mcl-1 is important only in certain cell types. Finally, the investigators showed that growth factors (natural proteins that stimulate cells to grow), such as the "stem cell factor," trigger the expression of the Mcl-1 gen...

Shift of weather patterns necessitates rethinking of reforestation methods

...anting. Rethinking planting time could remedy the loss due to droughty conditions, Taylor said. Traditional methods prescribe planting in the winter, but conditions ?primarily soil moisture and availability of planting crews ?may mean planting isn't done until late March. A decade or more ago, East Texas...

Live vaccines more effective against horse herpes virus

...verest form it can lead to neurological disorders, loss of coordination and even death. The virus is spread mainly by intimate contact between horses. Once infected, a horse carries the virus for the rest of its life in a "latent" (dormant) state. The same symptoms from the initial infection can be reacti...

Scientists journey to southern Africa to unravel the secret world of elephant communication

...hts in animal seismicity to the problem of hearing loss in humans. It turns out that people with hearing i... the possibility that newborns with severe hearing loss could have their hearing improved by exposure to vibrational stimulation shortly after birth. A com...

Cooperation is key—a new way of looking at MicroRNA and how it controls gene expression

...ople are stricken with septic shock. Likewise, the loss of control of genetic expression is the underlying cause of various forms of cancer--for instance the overexpression of genes that cause the cell to grow and the suppression of genes that curb cell growth. Humans and other animals have evolved many ...

Anammox bacteria produce nitrogen gas in oceans' snackbar

..., will have to be revised. The discovered nitrogen loss has also consequences for the carbon cycle in mari...refute the dominating theory that oceanic nitrogen loss results from the activity of bacteria that convert nitrate (via nitrite) with organic matter to nitr...

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