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Found results: 3424

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Nanomagnetic genes

Using the gene of a magnetic field-sensitive bacterium, Emory University scientists have created genetically modified mammalian cells capable of synthesizing magnetic nanoparticles.

19.06.2008
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No male can resist superpheromones

The detected pheromones activate specialized olfactory cells 30 times more strongly than all previously known urine pheromones of female mice combined. In addition, some of the new compounds selectively activate individual cells. This means that the male brain can evaluate various aspects of female health through selective analysis of individual pheromones.

19.06.2008
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Cancer cells: find and neutralize!

Researchers from Seoul National University have developed a method of cancer gene therapy by introducing a gene into tumor cells, the protein product of which tracks and destroys cancer cells, increasing the ability of the cell membrane to absorb iodine and its radioactive isotope. To improve the visualization of cancer cells, a reporter gene was also introduced, triggering the synthesis of a fluorescent protein during the expression of a therapeutic gene.

19.06.2008
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Double blow to the tumor

Scientists at the University of Missouri have developed a new non-toxic treatment method that effectively destroys breast cancer cells. The method consists in the introduction of a combination of a compound with a small molecular weight acting on tumor cells and an antibody selectively blocking the blood vessels of the tumor.

19.06.2008
News

Another mechanism of alcoholic brain damage

In chronic alcoholism, regions of the brain that are sensitive to the toxic effects of alcohol are characterized by pronounced resistance to insulin and insulin-like growth factor. The resistance of the frontal lobe and cerebellum regions to these hormones was accompanied by the destruction of cells and intercellular contacts, as well as a decrease in the levels of neurotransmitters necessary for learning, memorization and motor function.

18.06.2008
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Antibody-coated nanotubes will "fry" the tumor

When the lymphoma cells were introduced into the culture, the nanotubes coated with antibodies bound to the cell surface, and the subsequent exposure to near-infrared light caused them to warm up to a temperature sufficient to destroy the cells.

18.06.2008
News

Rejuvenation Recipe: More Notch and Less TGF-beta

Notch and TGF-beta regulate the activity of stem cells and other organs, including the brain, so the proposed approach can theoretically be used, if not for rejuvenation of the whole body, then at least for the restoration of physical damage to soft tissues and elimination of the consequences of stroke.

18.06.2008
News

Choose: stress and depression or gluttony and obesity?

Researchers have shown in experiments on mice that chronic stress leads to an increase in the concentration of ghrelin in the body. At the same time, the manifestations of depression and anxiety decrease, but a side effect of this beneficial property is increased food intake in experimental animals and, as a result, inevitable obesity.

18.06.2008
News

DNA and the brain (In search of genes for mental illness)

One of the hottest areas of research today is genetics in psychiatry. James Watson, who will come to Moscow at the invitation of the Russian Academy of Sciences, will tell about how DNA works in the holy of holies of our body – in the brain, how genes affect the formation of schizophrenia, autism and other mental disorders.

18.06.2008
News

Unique video recording: ovulation close-up

The process of egg release from the mature follicle was recorded by an endoscope camera inserted into the pelvic cavity of the patient. The video shows how a reddish protrusion appears in the hole formed by the action of enzymes in the wall of the follicle, and from it – an egg, which is sent to the fallopian tube.

17.06.2008
News

Pregnant and lactating women should refrain from eating too fatty foods

The authors fed rats with fat-rich food during pregnancy and lactation. The control group received the usual balanced feed. After stopping feeding with mother's milk, the cubs began to be given regular or fat-rich food. The time of puberty was recorded by traditional methods. In addition, the amount of fat in the body and the levels of sex hormones in the blood were evaluated in mature animals.

17.06.2008
News

Melanopsin will help to adjust the biological clock

The researchers created genetically modified mice with melanopsin-expressing cells sensitive to diphtheria toxin. Treatment of the retina of 8-week-old mice with this toxin did not affect their visual abilities at all, but completely deprived the biological clock of the animals of sensitivity to light.

17.06.2008
News

Tumors are provocateurs

The authors injected "provoking" human breast cancer tumor cells into animals simultaneously with passive "reacting" cells of human origin. Such passive cells formed extremely rapidly growing tumors, but only in the presence of provoking malignant cells.

16.06.2008
News

microRNA-155 and B-lymphocytes: mutate, but in moderation!

By controlling the level of the AID enzyme, microRNA-155 regulates the fight of the immune system against microbes, while preventing the formation of very aggressive malignant diseases: leukemia and B-cell lymphomas.

16.06.2008