Tag: "oxygen" at biology news
Model simulates dynamics of heart rhythm disorders
...lood flows out of the ventricles and the supply of oxygen
to the body is reduced. In ventricular fibrillatio...es. As a result, the body hardly receives any more oxygen
and death ensues within minutes. Spiral-shaped electrical waves rotating at a high frequency can re...
Timing is everything for optimum combined cancer therapy
... many other tumors are abnormal and do not deliver oxygen
to tumor cells as efficiently as normal blood vess... like that of normal tissues, thereby facilitating oxygen
delivery to the tumor and enhancing the effects of radiation treatment. "The time course of th...
Protein in urine may warn of preeclampsia risk in pregnant women
...iden blood vessels to the placenta, which supplies oxygen
and nutrients to the fetus," explains Karumanchi. "But for women with preeclampsia, the blood vessels grow narrower, which causes a host of life-threatening complications. Our discovery suggested this was happening because the anti-angiogenic protein...
No blind mice, thanks to UF scientists
... not needed for precise vision in order to improve oxygen
delivery to the parts of the retina that are needed for detailed vision. Intraocular delivery of agents that block SDF-1 represent an excellent and less destructive alternative." The research sheds light on the mechanisms of diabetic retinopathy and ...
Don't count on vitamin C to boost your exercise performance
...associated reduction in maximal cardiac output and oxygen
consumption in healthy adults," was conducted by C... this suppression isn't known, "increased reactive oxygen
species (ROS) may be involved," they thought. Furthermore, physiological or non-diseased aging "in ...
Scientists discover unique microbe in California's largest lake
...f near-infrared light and visible light to produce oxygen
by photosynthesis. "While there are some bacteria ...t it was necessary to use visible light to produce oxygen
through photosynthesis, but now we know there are at least three organisms that can do this using in...
Research turning up the heat on fowl bacteria
...or Campylobacter by helping the bacteria survive oxygen
radicals released by the immune system when it sees the invaders. These oxygen
radicals also prompt the intestinal inflammatory response that makes people sick. Symptoms include d...
Mitochondrial DNA mutations play significant role in prostate cancer
...d prostate cancer growth. Since mitochondria make oxygen
radicals as a by-product of making energy, and oxygen
radicals can stimulate cell growth, the researchers then tested the tumors for oxygen
Fat deficiency gene also spurs obesity
... in skeletal muscle consumed 10 to 15 percent less oxygen
than normal and exhibited a decline in body temperature, indicating that the gene in muscle determines energy expenditure, the team reported. The researchers further found that mice with excess muscle lipin exhibit a shift in metabolism, characterize...
Born to run? Capacity for aerobic exercise linked to risk of heart disease
...s now differ substantially in their ability to use oxygen
efficiently and generate the energy it takes to ru...se and fatty acids from food and combine them with oxygen
to produce an energy-storing molecule called ATP. Every cell in the body uses energy from ATP. Witho...
New evidence indicates biggest extinction wasn't caused by asteroid or comet
...s could not survive. "It appears that atmospheric oxygen
levels were dropping at this point also," he said....elevations." He noted that the normal atmospheric oxygen
level is around 21 percent, but evidence indicates that at the time of the Great Dying it dropped to...
Want to petrify wood without waiting a few million years? Try this
...lled in a cataclysmic eruption and, buried without oxygen
beneath lava, leached out their woody compounds and sponged up the soil's minerals over the eons. Shin's petrified wood journey began in a less dramatic fashion, a few minutes away at Lowe's, Shin's group reports in the current issue of the journal ...
Yellowstone microbes fueled by hydrogen, according to U. of Colorado study
...field measurements of hydrogen, sulfide, dissolved oxygen
concentration and other factors. Spear said it was difficult to explore a microbial ecosystem. "We have a hard enough time explaining what's going on in a forest, for example, with all the interlacing systems. We can't even see a microbial system....
Discovery promises simpler therapy for sickle cell disease
...behind the disease's primary symptoms -- including oxygen
deprivation and blocked vessels that can lead to p...mal vessel dilation by the red cells themselves in oxygen
deficiency. That oxygen
deficiency, in turn, may result in sickling and, ultimately, the irreversibl...
VCU research shows erectile dysfunction drug reduces death of heart cells in heart attack model
...t necrosis, accidental cell death occurring due to oxygen
deprivation, but also against apoptosis, cell death following DNA fragmentation. Furthermore, the researchers found the presence of phosphodiesterase-5 (PDE-5), an enzyme responsible for the destruction of the cGMP molecule, in the heart cells. The c...
Bioartificial kidney under study at MCG
...e patient is in failure. Kidneys require a lot of oxygen
and energy to perform their endless task, which makes them easy targets in the ICU, Dr. Szerlip explains. As examples, kidneys can become ischemic and begin to fail if blood pressure drops because of a long surgery with significant blood loss. Infect...
Effective cancer treatments follow the clock
..., fluid balance, body temperature, cardiac output, oxygen
consumption and endocrine gland secretion. In their experiments, the researchers measured the animals' body weight as an indicator of response to the anti-cancer drug. They discovered that Clock-mutant and Bmal1-knockout mice showed high sensitivity ...
Drought reduces nitrogen-fixing in legumes
...lso studied abscisic acid and species of activated oxygen
as possible molecules involved in the regulation o...e the possible involvement of species of activated oxygen
in the modulation of nitrogen-fixing, the exogenous application to plants exposed to water stress of...
Family trees of ancient bacteria reveal evolutionary moves
...at use light, water, and carbon dioxide to produce oxygen
and biomass has concluded that these species got ... are organisms that gave rise to chloroplasts, the oxygen
factory in plant cells. A half billion years ago Cyanobacteria predated more complex organisms like...
New system can measure productivity of oceans
... basis for most of the marine food chain, half the oxygen
in our atmosphere and ultimately much of the life ... and in the process absorb carbon dioxide and pour oxygen
into the atmosphere. Their abundance dictates the location and health of most marine fisheries. They...
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