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Tag: "oxygen" at biology news

Bubbles go high-tech to fight tumors

...to the list---gas bubbles used like corks to block oxygen flow to tumors, or to deliver drugs. The process of blocking blood flow to a tumor is called embolization, and using gas bubbles is a new technique in embolotherapy. What makes it so promising is that the technique allows doctors to control exactl...

How IVF could be causing genetic errors in embryos

...n that certain culture media and concentrations of oxygen altered the expression of several imprinted genes....ified by the composition of the culture medium and oxygen concentration. "Interestingly, the expression of one gene, H19, was reduced regardless of the cultu...

Corn waste potentially more than ethanol

... and anaerobic bacteria ?bacteria that do not need oxygen ?that consume the sugars and other organic materia...hydrogen atoms that combine with the electrons and oxygen to form water. The microbial fuel cells were inoculated with domestic wastewater and a nutrient m...

Heart has enough oxygen to survive hypothermia, CPR crucial

...rchers from Norway may have ruled out insufficient oxygen supply to the heart as the critical variable in wh...s found no significant difference in the amount of oxygen available to the heart between rats exposed to one hour of severe hypothermia and rats exposed to fi...

New GI technologies improve internal organ visualization

...ARM during the procedure. One subject experienced oxygen desaturation (level of breathing and sedation) below 90 percent (low=85 percent) and seven subjects experienced apnea for less than 30 seconds. However, the device automatically responded to these adverse physiological reactions by adjusting sedatio...

Ammonia-loving archaea win landslide majority

...ocess known as nitrification, combine ammonia with oxygen to form nitrates, which are used as nutrients by p...n that they can oxidize ammonia at least with less oxygen and probably also with less ammonia, but we don't know for sure. Our data clearly say, that the arch...

Combined treatment extends life expectancy for lung cancer patients

.... When tumors are targeted with radiation therapy, oxygen is vital to help the radiation damage DNA and kill cancerous cells. While radiation is most effective in destroying cells around the edges of the tumor, it is less effective at targeting the center of the tumor, which tends to be a low-oxygen environ...

UC Davis researchers reveal apples' protective ways

...egetables--behave as anti-oxidants, taking up free oxygen radicals that can damage precious DNA. The UC Davis study takes that research further by looking beyond the antioxidant effects of apple flavonoids. In the current study, Gershwin and his colleagues exposed human endothelial cells to an extract of a...

Scientists identify protein with a crucial role in cell death

.... And this is what the mitochondria ?which convert oxygen into the necessary energy ?are responsible for. Gi... have a normal development and are able to convert oxygen into energy, they have apparently lost their protection against apoptosis, and so the cells die off ...

New flood-tolerant rice offers relief for world's poorest farmers

...too long.When the plant is covered with water, its oxygen and carbon dioxidesupplies are reduced, which interferes with photosynthesis andrespiration. Because the submerged plants lack the air and sunlightthey need to function, growth is inhibited, and the plants will dieif they remain under water for more ...

Microbes transform 'safest' PBDEs into more harmful compounds

...heat, PBDEs release atoms called bromines that sap oxygen from the air, preventing a fire. Over time, PBDE’s can leach into the air, soil and sediment, and move up through the food chain. These compounds have been detected in fruits and vegetables, meats, dairy products and even household dust. The America...

Study shows pine bark naturally decreases severe chronic venous insufficiency

...e composite edema score by 32%. The transdermal oxygen and carbon dioxide concentration in the lower legs...eatment was found to significantly increase tissue oxygen and lower CO2, suggesting a considerable improvement in blood circulation to the legs. Daflon®, in c...

UCI scientists find chlorine may contribute to ozone formation

...n oxides. OH is a highly reactive molecule made of oxygen and hydrogen that forms photochemically in air. "For the last 30 years, we've known that the hydroxyl radical is the primary cause of ozone," Saltzman said. "Chlorine plays a similar role. It doesn't take much chlorine to affect ozone chemistry." ...

Harmful Algal Blooms monitored from space in Chile

...region of Chile. They deplete the concentration of oxygen in sea water, potentially killing larger caged fish such as salmon that cannot flee the affected area. In the case of shellfish, such as mussels, toxins from the blooms accumulate in their body tissues and pose serious health risks for humans whe...

Scientists take 'snapshots' of enzyme action

...ly excreted. "For FMOs, the end result -- that an oxygen atom gets added to make these compounds soluble --...ar time to perform the function of transferring an oxygen atom from the enzyme to the substrate. "Our finding shows that the substrate and cofactor are bindin...

Researchers attack tumor cells by exploiting dependency on sugar metabolism

...through a process that can occur in the absence of oxygen and involves conversion of glucose to lactate. Sci...ing tumor cells to survive even when environmental oxygen levels are not optimal. In addition, perturbations of the normal physiology of mitochondria, cellula...

How bad is malaria anemia? It may depend on your genes

...ing, the mice appear better able to maintain their oxygen carrying capacity and don't lose as much hemoglobi...ound in red blood cells responsible for binding to oxygen molecules. "Demonstrating that MIF clearly contributes to severe anemia suggests new ideas for the...

New study shows antibiotic may protect the heart

...ia are cellular organelles critical for converting oxygen into ATP, the key fuel for cellular function. "Rapamycin may one day be beneficial as a potential therapeutic strategy to limit cell death caused by ischemia or reperfusion injury, and possibly long-term prevention of ventricular remodeling ?the cha...

Research offers new hope for preterm babies

...ationship between blood pressure and the amount of oxygen in a preterm baby's brain. "Many preterm babies suffer from low blood pressure, which reduces the oxygen supply to their brain," said neonataologist and MIMR PhD student, Dr Flora Wong. "This makes them mu...

Eco-friendly bug sucker

...ectively suffocates organisms because they require oxygen to live. Ethanol gas is also used to kill fungi and bacteria. The technique could replace the use of post harvest pesticides, and may complete the phasing out of ozone depleting methyl bromide. In 1997 160 governments promised to phase out its use b...

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