Tag: "oxygen" at biology news
Children who stop breathing during sleep show brain damage
...hink that insufficient blood flow starves cells of oxygen
in the brain structures that regulate breathing," said Harper. "The breathing disorder results from the brain's inability to develop completely." Parents of children with CCHS are desperate to call attention to the need for research of the myster...
Device creates electricity and treats wastewater
...e there is a reaction of electron plus proton plus oxygen
to form water. Catalysts, such as platinum, are needed on both electrodes to promote the reactions. "We are doing basically the same thing as is done in a hydrogen fuel cell with our microbial fuel cell," said Angenent, whose graduate studen...
Elderly mice yield clues to the process of growing old
...ds that oxidative stress -- the body's reaction to oxygen
and the production of reactive, cell-damaging molecules known as free radicals -- is responsible for the aging process. According to the new Science report, markers of oxidative stress did not parallel the accumulation of mitochondrial genetic muta...
Unique interplay between tumor and blood vessel cells promotes angiogenesis and tumor growth
...like other cells, require blood vessels to deliver oxygen
and nutrients and to remove waste. Scientists have known for some time that tumor cells can stimulate blood vessel growth by secreting growth factors that promote angiogenesis. However, most human cancer therapies based on targeting these factors hav...
Genetic discovery could lead to drought-resistant plants
...n dioxide needed for photosynthesis and to release oxygen
back into the atmosphere. This new information will be important to plant breeders looking to improve crop resistance to drought, as well as to those seeking to understand plants' evolutionary responses to climate, says Campbell. "These genes are of ...
Highest concentration of specific ground water contamination in northeast US
...l tert-butyl ether (MTBE), a component used to add oxygen
to gasoline to meet Clean Air Act standards, has been detected as a contaminant in ground water supplies underlying urban areas, particularly in the northeastern United States. The study is published in the July-August issue of Ground Water. Researc...
JCI table of contents August 1, 2005
...sures that tissues receive adequate blood flow and oxygen
delivery during respiration and metabolic stress. ... appreciated for many decades, the identity of the oxygen
sensor and the mechanism of vasodilation remain uncertain. In a study appearing online on July 21 ...
Researchers figure out how hearts fail
...at the heart is still inefficient because a lot of oxygen
is necessary for it to drive the same amount of co...s the heart itself. Even though it pumps blood and oxygen
around the rest of the body, the heart itself also consumes a huge amount of the oxygen
that it take...
One hit of crystal meth causes birth defects: U of T study
...ainst free radicals highly activated, destructive oxygen
molecules that have been implicated in cancer and neurodegenerative diseases, says Wells. This vulnerability lasts from the embryonic stage through the later fetal period, times when organ structures and mental functions develop. "People usually thi...
Circulating stem cells play small role in lung repair
...ow sacs along the airways where the blood takes in oxygen
and discards carbon dioxide. The processes by which alveoli recover from damage are complex and incompletely understood, Zander said. Previous research showed that type II pneumocytes in the lungs are known to play a central role, but the role of th...
RPE meets EPR
...ells in the retina to soak up and destroy reactive oxygen
species. Reactive oxygen
species, or free radicals, energized by light, are thought to play a major role in macular degenerat...
Scientists discover global pattern of big fish diversity in open oceans
...features. Sea surface temperature and the level of oxygen
in the water were the most important factors in determining where the big fish in the open ocean congregate. These hotspots were mostly in subtropical areas with warm waters, sufficient oxygen, and sharp temperature gradients that serve to aggregate ...
Protein controls metabolism: U of T research
...ntified heme, an iron compound, best known for its oxygen
carrying capabilities in hemoglobin, as the molecule that allows the protein E75 to regulate a number of key developmental processes. In a paper published in the July 29 issue of Cell, the researchers use fruit flies to show that heme attaches itself...
New factor implicated in allergy and asthma attacks
...hemically hyperactive molecules known as "reactive oxygen
species," which are spawned by interactions betwee...containing NADPH oxidase produce damaging reactive oxygen
species in cell culture and, in experiments with mice, in their lungs and airway lining fluid. The ...
Insulin spares intensive care patients from organ failure and death
...to endothelial dysfunction which causes inadequate oxygen
supply to the cellular systems. The endothelium controls vascular flow and trafficking of important biological molecules. The endothelium of patients with prolonged critical illness is protected by strict blood glucose control with insulin and this...
JCI Table of contents August 1, 2005
...es. These pollen NADPH oxidases increase reactive oxygen
species in the lung and other pro-inflammatory fac...to endothelial dysfunction which causes inadequate oxygen
supply to the cellular systems. The endothelium controls vascular flow and trafficking of important...
Alligator egg development at prehistoric oxygen levels
... structures in alligator eggs raised under varying oxygen
concentrations creates a link to fossil records of...olution of vertebrates and prehistoric atmospheric oxygen
concentrations, according to a paper to be presented at the Earth System Processes 2 meeting in Albe...
Are hurricanes increasing? Ask a Georgia pine tree
..., Knoxville. In a "proof of concept" study of the oxygen
isotopes found in the cellulose of late-season gro...woody tissues for any sudden drops in a particular oxygen
isotope: oxygen-18. That is the hurricane signal, Mora said. What makes drops in oxygen-18 so tel...
Research may lead to optimization of radiation treatment
...ct. However, for distal tumor cells that are both oxygen
starved and lacking access to nutrients because they are farther away from the tumor vasculature, HIF-1 inhibition may actually lead to significant resistance to radiation treatment. "If one hopes to optimize the combination of HIF-1-inhibiting and c...
Leptin-signaling protein maintains normal body weight and energy balance in mice
...r the obesity of the SH2-B null mice, Ren measured oxygen
intake, carbon dioxide production and body heat pr...singly, mice deficient in SH2-B consumed much more oxygen
and generated more carbon dioxide and body heat than normal mice," Ren says. "Overall, their energy ...
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