Tag: "contrast" at biology news
MIT creates 3-D images of living cell
...p of fluorescent markers or other externally added contrast
agents, said Michael Feld, director of MIT's Georg...look at their movements, and when you add external contrast
agents you can never be sure that you haven't somehow interfered with normal cellular function, said...
X-ray images help explain limits to insect body size
...hought to lie in the insect respiratory system. In contrast
to vertebrates, where blood transports oxygen from the lung to the cell, insects deliver oxygen directly through a network of blind-ending tracheal tubes. As insects get bigger, this type of oxygen transport becomes far less effective. But if the atm...
Smithsonian scientists show differing patterns of rainforest biodiversity
...ialization in the plant species they feed upon, in contrast
to the common assumption that tropical species tend to be highly specialized. For the types of insects studied, study sites separated by as much as 500 kilometers shared more than half of their species. For fruit flies, the species makeup remained ...
Role of thyroid hormones in slumber under investigation at Rutgers
... functioning like neurotransmitters. His findings contrast
greatly with the well-documented functions of thyroid hormones, which are secreted from a gland located in the neck and increases cellular activity in nearly all tissues of the body by acting inside cells. Thyroid hormones do so much more than reg...
MGH researchers confirm that bone marrow restores fertility in female mice
...e continued producing eggs well into adulthood, in contrast
to the long-held belief that female mammals are born with a finite supply of eggs that is depleted throughout life. Both those papers have been extremely controversial, and the current study was designed to follow up the 2005 paper and to address cr...
News tips from the Journal of Neuroscience
...t, but not inverted figures. Stimulation of EBA in contrast
interfered with local processing, disrupting recognition of inverted but not upright bodies or body parts. The results pointed to parallel cortical processing pathways for recognition of the human form. A Case for Cytosolic Dopamine Neurotoxicity...
One species, many genomes
...ing that Arabidopsis has such a plastic genome. In contrast
to the genome of humans or many crop plants such a...n though it has about the same number of genes. In contrast
to these other genomes, there are few repeats or seemingly irrelevant filler sequences. "That even i...
Metabolic syndrome -- don't blame the belly fat
...lesterol (the good cholesterol) by 20 percent. "In contrast
to the young, lean, insulin-sensitive subjects, who stored most of their ingested energy as liver and muscle glycogen, the young, lean, insulin-resistant subjects had a marked defect in muscle glycogen synthesis and diverted much more of their ingest...
American Chemical Society's Weekly PressPac -- June 27/July 3, 2007
...Polyurethane plastics from canola oil Toward a contrast
agent to expand medical use of LOIS imaging Mi... ARTICLE #5 FOR IMMEDIATE RELEASE Toward a contrast
agent to expand medical use of LOIS imaging Nano Letters Scientists are reporting an advance tow...
Health Physics Society
... RDD (radiological dispersion device). This is in contrast
to the very high radiation from much less likely nuclear weapons detonations, which are often discussed in the same context as RDDs. Van Cleef even suggests that fear and angst from a dirty bomb could result in more deaths from car accidents during t...
Prey not hard-wired to fear predators
...ss in moose, and a change in coyote densities. By contrast
, where wolves and grizzly bears were lost, migratory birds including warblers and hummingbirds were less abundant because moose over-browsed vegetation used by these migrants. It is not just changes in climate or disease may alter our big remote wil...
Fruit bats are not 'blind as a bat'
...nd fruit bats or flying foxes (Megachiroptera). In contrast
to microbats, fruit bats (Fig. 1) do not echolocate. They have large eyes and pronounced visual centres in the brain. Fruit bats need a good sense of vision, because when they forage at night for nectar and fruit, they orient by vision and the sense ...
Pendulum love, science class gender gaps, musical mind mirrors, and unparticle physics
...ses, according to a new study that stands in stark contrast
to previous physics education research. In fact, while students as a rule benefit from interactive classrooms, the teaching technique may even increase the imbalance in some cases. The conclusion comes from research at the University of Colorado a...
Study investigates 'divorce' among Galapagos seabirds
...never permanently in or out of the mating game, in contrast
to many other animals, she said. A male Nazca booby cast off by a current mate may be selected by a different female the next year, after he has had a chance to regain his condition....
Combining molecular imaging technologies to stop/prevent heart attacks
...ector computed tomography (CT) imaging and a novel contrast
agent," said James H. Rudd, a cardiologist and sci...said. With CT imaging and N1177 (a nanoparticulate contrast
agent used to improve the effectiveness of CT and provided by NanoScan Imaging LLC), researchers "we...
A first: Simultaneous PET/MR images of the brain debut, increase molecular imaging capabilities
... technique that brings the exceptional soft tissue contrast
and high specificity of MR together with PET's excellent sensitivity in assessing physiological and metabolic state," he added. Combined or hybrid technologiessuch as PET/CT and SPECT/CTincorporate both imaging modalities into one machine but cond...
June 2007 issue of the Journal of Ultrasound in Medicine focuses on contrast-enhanced ultrasound
... review and approval of clinical use of ultrasound contrast
agents, and the AIUM is currently working toward t...e AIUMs belief that the current lack of ultrasound contrast
available potentially hinders the delivery of optimal diagnostic imaging, resulting in an adverse im...
Bigger is smarter
...ations. Domain-general cognitive ability stands in contrast
to domain-specific skills that are suited to particular environment challenges, such as a bird remembering where it cached food. The new study compared how well eight different brain size measures predicted the domain-general cognition variable gen...
Spud origin controversy solved
...etter able to reproduce in long-day conditions, in contrast
to Andean potatoes that were short-day adapted. The results of these studies are of interest not only to evolutionists but also for breeders. Years of effort were made to artificially recreate the European potato from Andean landraces yet it may ha...
Bat flight generates complex aerodynamic tracks
...g forces due to the air motion around them. " In contrast
with bird wings, the bat wing membrane must be kept under tension, otherwise it will flap uselessly, like a flag. As a consequence, Spedding said, there are limits to how much the wing can be folded during flight. Spedding and his colleagues think...
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