Tag: "tail" at biology news

Protein that fights bacteria and viruses cloned by Scripps scientists

...is a "frameshift" error--the 24 amino acids at the tail end of the gene are exchanged for a completely different set, and when the protein is translated in the cell, it cannot function. The fact that macrophages with these malfunctioning Trif proteins did not respond to LPS suggests that Trif might make ...

UGA scientists test less lethal means to determine contaminant uptake

...on-ICP-MS to sample minute sections of an animal's tail without sacrificing the animal. SREL scientists Br...ata from such traditional testing methods as whole tail concentration by homogenization, acid digestion and ICP-MS analysis with nonlethal samples. "Taken t...

Swimming can contribute to rebuilding bone strength

...easing running speeds, and weights attached to the tail of the Swim rats were progressively increased from zero to two percent of their body weight. According to a previous study, the weight gain of growing rats varied with the intensity of the running exercise. Therefore, body weight was also used as an ...

Researchers identify protein modules that 'read' distinct gene 'silencing codes'

...t two similar, but not identical, positions in the tail of histone H3: at position 9 (Lys9) and position 27 (Lys27). "Histone methyltransferases are one of the enzyme classes in the cell nucleus that 'writes' the histone code," says Allis. In 2001, Allis' laboratory at the University of Virginia (he join...

New fish species discovered in Venezuela

...oday the discovery of a tiny fish with a blood red tail in Venezuela's Upper Caura River. Previously unknown to science, the bloodfin tetra (Aphyocharax yekwanae), is described in the March 2003 edition of the journal, "Ichthyological Exploration of Freshwaters." The two-inch-long (50.7-mm-long) tetra is...

Molecule identified that contributes to essential cell functioning process

...tone mRNA expression, SLBP latches onto the looped tail of histone mRNA and signals the synthesis of histone proteins. In addition, SLBP remains bound to histone mRNA, making sure that its instructions are properly translated. But SLBP's role in the rapid destruction of histone mRNA when histone synthesis...

Genes discovered that regulate blood stem cell development

...ecause it had few blood stem cells, and also had a tail defect. The zebrafish mutants generally die within seven to ten days after fertilization. They discovered the mutation in the cdx4 gene, which is associated with the early blood deficiency as well as abnormal developmental patterning, including abe...

Protein-hungry cells 'go fishing,' report Purdue biologists

...lves binds to the vitamin B-12 receptor, while its tail end remains hanging from the membrane like a long ...rod. The B-12 receptor then essentially swings the tail around until it finds what it needs - the second receptor that can admit the rest of the colicin. "T...

UCLA study sheds new light on island evolution

...tiny tissue sample from each lizard's regenerative tail to use in DNA analysis. Working in the lab over the following 10 months, they created a genetic profile for each lizard. Given the numbers and frequencies of physical and genetic differences among lizard populations, they determined that lizards wer...

Scientists solve puzzle of how kinesin motor molecules walk or limp across cells

... of an inch long, a typical kinesin molecule has a tail on one end that hauls the cargo and two globular heads on the other end that alternately grab the microtubule and pull the cargo forward. One head has to be attached to the microtubule at all times for kinesin to advance against loads. "It's like pul...

New evidence suggests that monkey thought extinct still exists

...in Ivory Coast, another hunter gave McGraw a black tail from a monkey. Two black-tailed monkey species inh...rn forests. Subsequent DNA testing proved that the tail did indeed come from a red colobus monkey. Ironically, the hunter said he had shot the animal only a...

The Rosetta space probe's long trek to Comet 67P/Churyumov-Gerasimenko

... illuminated by the Sun, this characteristic comet tail then becomes visible from Earth. In the course of the mission, the processes at work within the cometary nucleus will be studied and measured more precisely than has ever before been possible, for earlier probes simply flew past their targets. "As w...

Steroid-coated DNA represents new approach to gene delivery

...ng a nitrogen-rich, postively charged tail. This tail provides the glue that attaches the steroid to the naked DNA. "The steroid is a fatty lipid so, in essense, we have greased up DNA for cellular uptake," Diamond said, "plus the cells get a big dose of steroid." According to Diamond, the chemistry i...

Tadpoles and tumors

...his process would actually reveal that the tadpole tail doesn't simply fall off but rather grows shorter in a process called tail resorption. Scientists who study this process on a molecular level have known that a protein called...

Animal studies show promise treating severe chronic pain

...the drug into multiple ganglia that connect to the tail and hind legs. In both experiments, rats maintained their normal motor function as well as their ability to respond to other sensory stimuli, such as warm and very hot thermal stimulation and a mechanical pinch, an indication that RTX had only affe...

Scripps scientists look deep inside sharks and their high-performance swimming system

... the front of lamnid sharks transfer energy to the tail region. This high-performance muscle system serves for powerful swimming propulsion, not unlike a natural, thrust-producing hydrofoil. "It's interesting because the area of the body that is producing this motion is not the same area of the body that ...

Mite transmits viruses damaging to wheat

...itable as a food source, so the mite stands on its tail end to catch an air current and ride to a new, fledgling host. Dr. Jerry Michels, Experiment Station entomologist at Bushland, said mites are common in most years, but this year is extremely bad for the two viruses. "Unfortunately, chemi...

Molecular image of genotoxin reveals how bacteria damage human DNA

...alled the "aromatic patch," and a dangling protein tail that can block a key portion of the CdtB subunit t...ure what the role of the cleavage-blocking protein tail is, but the structure helps us to understand how to interact with the active site of CdtB to impair ...

New mouse species found in the Philippines

... 15 grams, and has a body length of 3 inches and a tail of four inches. The mammal's whiskers are about eight times as wide as its head, and there is a second set of "whiskers" that arise from a patch at the back edge of each eye. "Nearly all of the many unique small mammals on Luzon Island are descended...

Researchers report major advance in gene therapy technique

...lts with high-pressure injection of genes into the tail veins of rodents, a technique that yielded extensive gene expression in the animals' livers. "We think the genes traveled from the capillaries through the relatively large holes that exist in liver cells," Wolff says, adding that the technique has ...

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