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Tag: "measure" at biology news

Nano machine switches between biological and silicon worlds

...ering a weather balloon. A Hall-Effect sensor can measure the vertical movement of the magnetic bead which indicates whether the switch is on or off. That, in an over-simplified nutshell, is the essence of the molecular switch, an actuator for the nano-scale world. This is particularly important because a ...

Diverse tropical forests defy metabolic ecology models

...STRI) decided that the way to understanding was to measure and map every single tree in an area of lowland tropical forest on Panama'TMs Barro Colorado Island. Tree abundance, distribution, growth and mortality data from repeated five-year censuses of this site proved so useful to ecologists and foresters al...

Too much sugar not good for coral reefs

...to grow out of control. People don't usually even measure carbon when they do water quality studies. They only look at the nutrients found in fertilizers. Nitrogen and phosphates cause algal overgrowth on corals, which also contributes sugars to the system. It is vital to consider the carbon component as...

Warbling whales speak a language all their own

...stics of the humpback songs recorded in Hawaii. To measure a song's complexity, Suzuki analyzed the average amount of information conveyed per symbol. He then asked human observers who had no previous knowledge of the structure of the whale songs to classify them in terms of complexity, redundancy, and predi...

Amazon rainforest greens up in the dry season

...reener. The greenness can also be translated to a measure of plant growth called "gross primary productivity.... "We can look at this increase in greenness as a measure of Amazon health, because in the disturbed areas we don't see the greenness increase during the dry ...

Stem cell study for patients with heart attack damage seeks to regenerate heart muscle

...of the diseased heart muscle has been repaired and measure heart function. A patient may stay in the hospital only 2-3 days for observation, and then go home. The total time commitment for the study is two years. Congestive heart failure is a common outcome in heart attack patients and is the number one ca...

Aspirin reduces cardiovascular risks in men and women -- but differently

...acks of regularly taking aspirin as a preventative measure against cardiovascular events. "Aspirin is a drug that has been used for many years ?it is well-understood, effective, inexpensive and widely available," said Duke cardiology fellow Jeffrey Berger, M.D, first author of a paper published Jan. 18, 200...

How 'hot' emotional brain interferes with 'cool' processing

...I technique the researchers developed to precisely measure this distraction, they said. The researchers, Flo...ological target of the drug and not have to try to measure the more nebulous behavioral response. So, we can detect a sub-threshold response to such drugs, whi...

Access to antiretrovirals unlikely to reduce HIV infection rates

...on of diagnostic laboratories that could routinely measure CD4 counts and viral loads of HIV-infected individuals (only if this is done could people be treated before they develop overt symptoms). They also took into account different ways that people might change their sexual behavior if they get treatment ...

Two NIH initiatives launch intensive efforts to find roots of common diseases

...nd $14 million for the development of new tools to measure environmental exposures that affect health. "The ...will also invest in innovative new technologies to measure environmental toxins, dietary intake and physical activity, and to determine an individual's biologi...

St. Jude projects 90 percent cure rate for ALL

...h cells in samples taken from the patient. Doctors measure MRD to determine if induction therapy has eliminated enough leukemic cells to ensure a high probability of success. Until now, researchers had to rely on the less-accurate technique of microscopic examination to determine which cells in a child's blo...

Intensive statin therapy may partially reverse plaque build-up in arteries

...nd probe is inserted into the coronary arteries to measure plaque. The study showed that regression occurred for all three pre-specified IVUS measures of disease burden. The mean baseline LDL cholesterol of 130.4 mg/dL dropped to 60.8 mg/dL in the study patients, an reduction of 53.2 percent. This is the l...

Potential heart benefit found in stem cells

...als were euthanized and the hearts were removed to measure the left ventricle wall thickness and the density of the corresponding capillaries in four areas: the damaged or infarct area, the healthy myocardium (cardiac muscle), and in two parts of the border zone. As predicted, the infarct areas of the he...

How can we protect patients with weakened immune systems from influenza?

...ter," said Dr. Sullivan. The research teams will measure T cell and B cell counts in the targeted patients. Both types of cells play important roles in the immune system. T cells that recognize and fight influenza may help predict whether a patient will produce protective antibodies after vaccination. Prod...

Morning grogginess more debilitating than sleep deprivation, according to CU-Boulder study

... his colleagues said further studies are needed to measure the effects of nap interruption and "recovery sleep" in on-call, sleep-deprived individuals. The study also illuminates the challenges faced by everyday people who are forced to make crucial decisions following abrupt awakening. "If a person is awa...

Measuring artery repair cells could become new heart disease test

... Our tests so far measuring using ALDH activity to measure EPCs represents a novel approach to solving this p... these cells. Researchers have used ALDH assays to measure the number of stem cells in the bone marrow, so the team has extended this assay to detect levels of...

Some like it hot: Worms at deep-sea vents favor a fiery 45-55°C

...s around the thermal vents, making it difficult to measure precisely the deep-sea temperatures survived by Alvinellid worms. Rather than taking submarine-borne thermometers to the worms' remote habitat, Girguis and Lee brought the worms to their special aquarium, leaving the deep-sea creatures free to choos...

How sperm crack the whip

...because no one had ever seen inside sperm cells to measure all the currents that control their activity," he said. "We are already measuring many of these currents and beginning to answer questions about what they are and what they do." Further studies, said Clapham, will aim at exploring the many controll...

Relationship of brain and skull more than just packaging

...m. Instead, they measured the correlations between measure taken on brain and those taken on skull. Overall, they found that the correlations between brain and skull were very high. Because normal infants almost never have MRIs and CT scans done at the same time, there are no controls available with which t...

Blood flow in brain takes a twist, affecting views of Alzheimer's

...ringing about an increase in blood flow. "When we measure blood flow," said Nedergaard, "it may be that we are not measuring the activity of neurons so much as that of astrocytes." The idea creates a "chicken or egg" type question in patients with conditions like Alzheimer's or traumatic brain injury where...

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