Life Sciences

Found results: 11545

Theories of aging

Evolution of sexual dimorphism in human lifespan (3)

If longevity is the result of the evolution of men, why do women live longer? In this case, the pronounced sexual difference in human reproductive models provides a plausible explanation: a large variability in the number of offspring in men.

09.10.2014
Nanotechnology

Nanomedicine: Hurdling

Chemist Natalia Klyachko – about nanozymes, drug delivery to the body, socially significant drugs and the barrier between the laboratory and production technology, which, unfortunately, requires a lot of money to overcome.

09.10.2014
Genetics

Coffee in the genes

The "coffee drinkers" have a genetically determined rate of caffeine metabolism without compromising their health, which is why they can safely enjoy their favorite drink and not experience any discomfort.

09.10.2014
Other life sciences

The fewer calories, the healthier the DNA

Unfortunately, the DNA repair process is imperfect, and sometimes the damaged DNA is passed on to the descendant cells. Molecular biologists have learned how the response of cells to DNA damage is affected by the level of nutrients.

09.10.2014
Theories of aging

Evolution of sexual dimorphism in human lifespan (2)

According to the patriarchal hypothesis, the longevity of women is the result of inheritance of autosomal (non-sexual) genetic determinants of longevity, the selection of which occurs in the chromosomes of men.

08.10.2014
Other life sciences

Gamers will help scientists to be honest

Projects such as EteRNA represent a new model of remote research, thanks to which it is possible to prevent the main forms of scientific fraud.

08.10.2014
Bioethics

Euthanasia: pros and cons

"Euthanasia" is a rather narrow term describing a specific medical procedure: active murder of a terminally ill person, executed at his request by administering medications by a doctor.

08.10.2014
Genetics

Five-plus genes

The authors of the article in PNAS estimated the contribution of mental characteristics obtained with genes to the results of school studies at 62 percent. And together with the IQ level, the genetic basis of excellent academic performance reaches 75 percent.

07.10.2014
Theories of aging

Evolution of sexual dimorphism in human lifespan (1)

Why do humans live longer than other higher primates? Why do women live longer than men? What is the significance of menopause? The answers to these questions could explain the mechanisms underlying the evolution of human aging.

07.10.2014
Other life sciences

Vitamin B2 will help to find cancer stem cells

Scientists have discovered a new specific marker of cancer stem cells. This is riboflavin, or vitamin B2, a pigment that, as a result of its accumulation inside intracellular vesicles, emits green light.

07.10.2014
Genetic engineering

GM bacteriophages against antibiotic resistance

Antibiotics have two problems: non-specificity and antibiotic resistance. Both of these problems will be solved in one fell swoop by the approach proposed by the American-French group of scientists in the journal Nature Biotechnology.

07.10.2014
Other life sciences

GPS in our brain

The cells of the "navigation system" of the brain, for the discovery of which the Nobel Prize was awarded, are compared with the GPS global positioning system.

07.10.2014
Nanotechnology

Magnetic fields control "nanorackets"

Researchers from the University of Nijmegen have learned how to open and close nanoparticles using magnets. This process allows for the directed transport of medicinal substances in the body.

07.10.2014
Genetics

There are 2 times more "growth genes"

An international consortium of scientists has managed to almost double the number of mutations associated with human growth, clarifying about one-fifth of the biological picture of its heritability.

06.10.2014
Other life sciences

Capsule instead of injection

Hollow capsules covered with microscopic needles can inject drugs directly into the mucous membrane of the gastrointestinal tract.

03.10.2014
Nanotechnology

Nanoparticles against autoimmune diseases

The introduction of biomimetic nanoparticles into the blood makes it possible to remove pathological antibodies from the body responsible for the development of an autoimmune reaction.

03.10.2014
Theories of aging

A reasonable man liberated

Vladimir Skulachev is a scientist the whole world knows. And at the same time, he is a dissident in science, who decided to challenge not only colleagues, but also the fundamental limitations of human nature – aging and death.

02.10.2014
New in Gerontology

Does brain aging begin in the vascular plexuses?

The authors of the work, published recently in the journal Science, found out what the aging of the brain is expressed in. They even suggested a way to scroll back in time.

02.10.2014
Genetics

Telegony of flies

Australian biologists have found out that in nature there is still a kind of similarity of telegony – a popular concept in the XIX century, even in the partial justice of which all biologists stopped believing at the beginning of the XX century.

02.10.2014