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Tag: "quantity" at biology news

Placenta Is A Rich Source Of Blood Stem Cells

...atients receiving transplants, but growing them in quantity is difficult. The cells don't multiply readily in the laboratory, so they must be harvested from bone marrow by needle aspiration, a painful procedure, or coaxed into the blood and then collected. Both methods yield only a limited number of blood ste...

Circles Of DNA Might Help Predict Success Of Stem Cell Transplantation

Measuring the quantity of a certain type of immune cell DNA in the blood could help physicians predict whether a bone marrow stem cell transplant will successfully restore a population of infection-fighting cells called T lymphocytes in a child. This research, by investiga...

Genetically modified rice in China benefits farmers' health, study finds

...Measured on a per hectare (2.471 acres) basis, the quantity and cost of pesticides applied to the conventional rice was 8 to 10 times as high as that applied to the insect-resistant genetically modified rice. In short, use of the genetically modified rice enabled the farmers to reduce pesticide use by 15 pou...

PET/MRI scans may help unravel mechanisms of prenatal drug damage

...e PET study, each animal was injected with a trace quantity of cocaine--less than 10 micrograms, which is not ...nd slower than in the mother's brain, a measurable quantity of cocaine and/or its labeled metabolites does accumulate in the fetal brain, particularly in the st...

A little stress gives beneficial oomph! to immune system

... mice, the researchers also analyzed the types and quantity of specific immune cells attracted to each of the proteins. "While all major leukocytes are mobilized in great numbers at the first hints of acute stress, the immune proteins that are generated at the battle site will determine which types of immune...

One gene links newborn neurons with those that die in diseases such as Alzheimer's

...ls of each type. From these they purified RNA, the quantity of which corresponds to the activity of the particular gene producing it. The microdissection technique uses a low-power laser to melt a small circle of film into the tissue. When the film is lifted, the cell body - including its RNA - comes with it,...

Secret of smallpox's success may lead to bioterror cure

...e immune response tends to be very strong when the quantity of the uncloaked virus is high. According to Jacobs, the uncloaked vaccinia virus has the potential to be useful for developing novel post-exposure vaccines for other dangerous viruses as well, making available a who new arsenal of weapons against d...

Changing ecosystems throw scientists mega-challenges

...al change, the report states, ensuring an adequate quantity and quality of freshwater for sustaining all forms of like is a growing challenge. " Integrated, multidisciplinary, and multi-scale, water-related research is necessary for meeting the challenge." The authors recommend that NSF focus on water as a u...

Alarm pheromone causes aphids to sprout wings

... frequency of pheromone release and not the actual quantity present, possibly to avoid manipulation by plants. Thus, to reduce damage caused by aphids, the major insect pests in Europe, it may prove effective to apply pulses of alarm pheromone to infested fields. ...

Alcohol consumption disrupts breastfeeding hormones

...is drinking alcohol just to improve the quality or quantity of her milk, she needs to know that there is no evidence to support this claim. In fact, what happens is quite the opposite, as alcohol disrupts the hormonal milieu of lactation in a way that could impede successful breastfeeding." For centuries, br...

Excess liver gene protects against high-fat diet

...st that natural variation among individuals in the quantity of the liver receptors might lead to differences among them in their susceptibility to high cholesterol and heart disease in a manner dependent on diet. Furthermore, drugs that modulate LXRa activity may have potential as therapies for lipid disorder...

Researchers devise new technique for creating human stem cells

... humans it is very difficult to obtain eggs in any quantity and difficult or impossible to genetically manipulate them," he said. "But embryonic stem cells can be grown in large quantities. We can isolate the components of the reprogramming machinery, and we can genetically manipulate the cells to analyze the...

Life's origins were easier than was thought

...y for the first living organisms to develop. "This quantity of genes would be enough for a simple organism to have enough functional activity", according to the researchers. Recent analysis into the minimum number of DNA genes required to constitute bacteria, the most simple organism today, considers that aro...

Hidden sponges determine coral reef's nutrient cycle

...s first of all examined the precise appearance and quantity of these virtually inaccessible caves and their living communities. He did that on the Caribbean island of Curaao using a special underwater camera. The films shot revealed that sponges were the most important inhabitants, followed by animals such as...

Acid water in East Java threatens biodiversity and local welfare

...t suffer any detrimental effects due to this small quantity of acidic water. Lohr wants to hold discussions with local authorities, other researchers and companies in order to arrange such a diversion or another solution. The biologist recently received a dissemination grant from NWO-WOTRO to support this. ...

Female butterflies go for sparkle -- not size -- when choosing to mate

...ted female preference for wing size, eyespot size, quantity of eyespots on the wing, eyespot and pupil color, and pupil reflectivity. "Once we found a trait that appeared to be important, we then would exaggerate it or reduce it to pin it down," said Monteiro. None of the variations induced on the ventral s...

MicroRNAs have shaped the evolution of the majority of mammalian genes

...ing idea is that microRNAs often act to reduce the quantity of protein a gene produces without shutting it off all together. "We think the microRNAs are sometimes having what you can call a dampening effect," says Bartel, who is also a Howard Hughes Medical Institute investigator and MIT professor of biology...

Male elephants woo females with precise chemistry

...ne is first detectable in the late teens, with the quantity secreted rising about 15-fold over a 25-year life span. Young males secreted significantly more of the "plus" frontalin than "minus," but the ratios became almost equal as the elephant matured, especially between ages 31 and 43. Musth periods get l...

Cells from amniotic fluid used to tissue-engineer a new trachea

...ze to human babies), Fauza's team obtained a small quantity of amniotic fluid and isolated mesenchymal stem cells. Mesenchymal stem cells descend directly from embryonic stem cells and are abundant in the amniotic fluid. They specialize in making connective tissues, including muscle, bone, cartilage, fat and ...

Implantable pumps extend lives of patients too sick for transplant

...who received the devices not only had a lengthened quantity of life, but they appeared to have an improved quality of life," said Duke cardiologist Joseph Rogers, M.D., who presented the results of the trial Nov. 14, 2005, at the annual scientific session of the American Heart Association meeting in Dallas. "...

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