Tag: "colony" at biology news
Commandeering cellular machinery: recognition mechanism to detect small molecules
...o the compound on the plate, the yeast will form a colony
around that one. This allows us to do highly parallel and rapid screening to find a few functional receptors in a large collection of nonfunctional receptors." The receptors found by the researchers varied in their responsiveness, with some signific...
Biologists ID molecular block for social 'cheaters'
...-fifth of the single-celled individuals within the colony
sacrifice themselves to form the stalk that holds up the spores. Before forming a stalk, the colony
goes through a stage where it forms a slug-like structure. During this stage, cells produce a signal...
NHGRI seeks next generation of sequencing technologies
...This group will work to further develop polymerase colony
(polony) sequencing technologies. This is a highly parallel sequencing approach that involves synthesizing short regions of identical DNA fragments on magnetic beads, packing millions of them into a chamber and then extending each of those molecules ...
Intracellular protein localization involved in new tumor progression pathway
...rvivin to the mitochondria this enhanced soft agar colony
formation, which is a standard laboratory technique to test for cells that lack growth control and are potentially tumor forming. In mice, when the authors carried out such mitochondrial targeting of survivin, this resulted in increased tumor growth ...
Joslin and Stanford researchers find key clues to muscle regeneration
...ll from this subset could alone generate a sizable colony
of new muscle cells. "Identifying this precursor of new muscle cells gives us new research tools for future studies, including those in humans," said Dr. Wagers. "As we learn more about the genes expressed by these cells and the pathways involved in ...
Invasive sea squirt alive and well on Georges Bank
...ex.htm . Figure captions.Image DSCF1526. Tunicate colony
of a species of the genus Didemnum encrusting and cementing a pebble gravel seabed and crowding a dark orange anemone (lower part of photo). Note the relatively few holes in the mat where the gray background is visible. Northern Georges Bank (41 de...
Census of Marine Life - Discoveries and Highlights 2004: Scientists add 4m+ records, 13,000 species
...enus new to science. Meanwhile, discovery of a colony
of rhodoliths, coral-like marine algae, surprised biologists studying Prince William Sound, Alaska. Hard, red, resembling toy jacks, the plants roll like tumbleweed in beds used as nurseries by scallops, shrimp, and other invertebrates, prompting pla...
New pheromone creates buzz about the clout of older bees
...ager "This provides clear insight into how a bee colony
works," said Gene Robinson, G. William Arends prof...-Urbana. "What's most impressive about a honey bee colony
is it is able to respond to changing conditions and alter its division of labor. When you think of t...
Study in Royal Society journal on first evidence for magnetic field detection in sharks
...y to altitudes of 20-50m and when returning to the colony
they climb to altitudes up to 500m to avoid attacks by frigatebirds along the coasts. Thus, boobies use a series of very specific flight and activity patterns that have been selected as adaptations to the particular conditions of tropical waters. Con...
New pathway identified in angiogenesis
... in the body called GM-CSF (granulocyte-macrophage colony
stimulating factor). GM-CSF stimulates monocytes to produce soluble receptors for VEGF (vascular endothelial growth factor), the substance tumors secrete to signal nearby blood vessels to build connectors to them. "When tumors reach a certain ...
Researchers discover a stem-cell switch lurking within leukemias
...These sustaining cells are like the queen bee in a colony
-- they are the one type of cell required to propagate the entire tumor and probably the most important target for therapies," said Gilliland. "It's an attractive theory, because it fits so nicely with what we known about leukemias -- that we can tre...
Unusual reproductive behavior of odd ants surprises scientists
...e caste system a precise division of duties among colony
members. In most of these societies, environment i...iology at the University of Vermont. A typical ant colony
includes one queen and, in the case of harvester ants, hundreds or thousands of sterile female worke...
PET/MRI scans may help unravel mechanisms of prenatal drug damage
...ocedure, the animals were returned to their social colony
to deliver their offspring. The combined images show that cocaine and/or its labeled metabolites readily cross the placenta. But the cocaine uptake distribution pattern observed in the fetus was very different from that of the mother. For example, m...
Sexual cooperation: Mating increases longevity in ant queens
...are only produced after several months or years of colony
growth, during which a sterile worker force is bui...n experiencing a long reproductive phase after the colony
reaches sexual maturity....
Falling ants glide back to trunk to avoid dangers of forest floor
... encephalitis. In hopes of establishing a mosquito colony
in the laboratory, he goes in search of mosquitoes and larvae in the canopy where they live, mostly above private land around the city. Using ropes and cave-climbing equipment, he ascends trees and collects mosquito larvae from water-filled tree cavi...
The secret to longevity in tubeworms
... near the vents do not match the observed tubeworm colony
size and individual longevity, leading Cordes et a...predicts an average lifespan of only 39 years in a colony
of 1,000 individuals; with it, survival increases to over 250 years, matching the longevity of actua...
To control germs, scientists deploy tiny agents provocateurs
... sense each other and the overall density of their colony
by continuously exchanging small molecules and peptides - a process known as quorum sensing. Past a certain density threshold, the colonies unite to initiate group behaviors, such as biofilm formation. Attempting to manipulate quorum sensing in both ...
Children's Hospital & Research Ctr. at Oakland's DNA library helps to map the sex chromosome
...n DNA strand and are now present in colonies. Each colony
represents one type of DNA fragment. The genetic information of the genes is derived through the analysis of these fragments in a process known as "DNA sequencing". This process was used to help a team of international scientists map the X chromosome...
Short-term social stress may benefit immune response to infection
...rt-term, episodic, and severe. The mice lived in a colony
with a well established hierarchy of mice, so having a higher-ranked, more aggressive mouse placed in their cage for two hours was definitely disruptive and upsetting. This stressful episode was repeated on six consecutive days, after which both stre...
Breakthrough in stem cell research
...e world in Israel." By growing a human stem cell colony
from a single cell, researchers are one step closer to deriving a homogenous population of cells of a particular type. "There are about 230 different cell types in the body. All these cells are derived from three embryonic layers one which forms th...
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