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Tag: "size" at biology news

The right drug at the right time

...ptical properties by growing them to precisely the size they want by adjusting the cooking time. The solv... team now has a method for predicting the particle size and growth behavior of quantum dots based on only three physical properties of a given solvent: visc...

Prenatal exposure to famine increases risk of schizophrenia

...ophrenia in later life. Using a much larger sample size with clear evidence of exposure, our findings are internally consistent and almost exactly replicate the Dutch findings. Since the two populations are ethnically and culturally distinct, the processes involved may apply in all populations undergoing ...

DNA size a crucial factor in genetic mutations, study finds

...er than natural thymine, the second about the same size and the last three were increasingly larger. The d...a. According to Kool, these results indicate that size is a strong factor determining enzyme efficiency-and a mechanism for allowing mutations into the DNA...

Applying ecological laws to bacteria

...died, such as lathes and mills, were of increasing size and were said to be analogous to an archipelago of...hese communities to perform useful tasks.' Island size and bacterial diversity in an archipelago of engineering machines. Christopher J. van der Gast, Andr...

Researchers learn how blood vessel cells cope with their pressure-packed job

...searchers stretched cells in a workout chamber the size of a credit card to gain a better understanding of how repetitive stretching of endothelial cells that line arteries can make them healthy and resistant to vascular diseases. Bioengineering researchers at UCSD's Jacobs School of Engineering will rep...

Restaurant seafood prices since 1850s help plot marine harvests through history

...ocks in the North Sea have declined in numbers and size based on records dating from the 1870s ?illuminati...How archaeologists are documenting the diminishing size of North Sea fish between the years 1000 and 1500, a sure sign of over-fishing, but that such pressu...

A bug's life: Exceptional genomic stability yet rapid protein evolution in a carpenter ant mutualist

...cterial symbionts is a massive reduction in genome size compared to their free-living counterparts ?a phenomenon called "genome streamlining." Additional genome sequences of bacterial symbionts are needed, however, to more fully understand the biological basis for these associations. Research assistants ...

Researchers find gland that tells fruit flies when to stop growing

...rganism determines when it has reached its optimal size and growth should cease. Now University of Washin...it fly, have discovered an organ that assesses the size of the juvenile and signals when it has reached a critical weight to begin metamorphosis into an adu...

Regenerating worms help elucidate stem cell biology

...d from the pieces. Cut a piece that is 1/279th the size of the animal, and it too will regrow into a complete worm. The process, scientists know, is dependent on stem cells in the adult planaria known as neoblasts. Like all stem cells, neoblasts have the capability to develop into a variety of different...

Retinal scans eyed for New Mexico show cattle

...ated on the cow's left ear, the tags are about the size of a bottle cap. With more than 900 RFID tags applied since May, only two have been lost. Using a panel tag reader located on a cattle chute, researchers found that the RFID tags could be readily read as cattle passed through a single-file alley. E...

Extinct giant deer's descendant found in UK

...characteristics - such as antlers, skull and teeth size & shape - were studied. Two giant deer were used; one found in the Ballynamintra Cave, Waterford, Ireland which was around 13,000 years old; the other taken from Kamyshlov Mire in western Siberia. Dr Lister said: "The fact that DNA survives in f...

Study Holds Promise For New Way To Fight HIV

...characteristics - such as antlers, skull and teeth size & shape - were studied. Two giant deer were used; one found in the Ballynamintra Cave, Waterford, Ireland which was around 13,000 years old; the other taken from Kamyshlov Mire in western Siberia. Dr Lister said: "The fact that DNA survives in f...

NRL scientists detect 'milky sea' phenomena

...n. The glowing waters spanned an area roughly the size of Connecticut (over 15000 km^2) and lasted at least three nights. The event took place in the northwest Indian Ocean, approximately 280 km off the Somali coast. The boundaries of the feature matched closely with a surface ship's reported entry and e...

'Nanospheres' that block pain of sensitive teeth

...ew hydroxyapatite at various pH levels to vary the size of the particles it is made up of. At normal pH, it is composed of long rod-like structures but at high pH levels the particles of hydroxyapatite become smaller and more rounded, better for fitting inside the tiny channels in teeth. To see whether ...

NJIT study shows nanoparticles could damage plant life

...between the seeds and the nanoparticles. The small size of the nanoparticles may be changed by the nanoparticles aggregating or clumping together." But what is still not understood, said Watts, is the nature of the interaction between the nanoparticle and the root of the seed. "What is the mechanism of ...

University of Delaware researchers develop cancer 'nanobomb'

...livery vehicles. Because they are smaller than the size of a single cell, the nanotubes can provide for the highly selective injection of drugs into individual cells. As they undertook various experiments, however, the team made a startling discovery. "When you put the atoms in different shapes and for...

Cyberkinetics, Case to develop system to help restore extremity function

...ntrol. The sensor is a tiny silicon chip about the size of a baby aspirin with one hundred electrodes, each thinner than a human hair, that can detect the electrical activity of neurons. The sensor is implanted on the surface of the area of the brain responsible for movement, the motor cortex. A small wir...

Bacteria which sense the Earth's magnetic field

...l magnetite (Fe3O4) -- only about 50 nanometres in size (one nanometre = one millionth of a millimetre). To build magnetosomes, the cells do not only have to take up large amounts of iron from their surroundings and, from it, produce special iron oxide. The crystals also have to have a exactly defined nu...

Scientists determine structure of enzyme that disrupts bacterial virulence

...that can increase virulence. In order to sense the size of their own populations, certain bacteria produce small molecules called N-acyl homoserine lactones. The concentrations of these lactones increase along with the growth of the bacterial population. After reaching a threshold concentration, the lact...

Why Christmas trees are not extinct

...s. "The flow resistance through a valve of a given size is 59 times lower in a Christmas tree than in an oak tree." Flowering trees have longer, more efficient conduits, but less efficient valves. Evolution Produces Two Ways to Water a Tree Sperry says conifers and flowering trees evolved with "two ...

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