Tag: "stranded" at biology news

Researchers determine fundamental mechanisms involved in immune response

...B cell is activated by an antigen, specific double stranded segments of DNA in the Ig split off and loop out in a very controlled pattern known as an R-loop. One part of the strand is transcribed into RNA while another single strand of DNA is not transcribed. Alt's team showed that transcription leading to th...

Solid management, natural resilience both key to sockeye success

...hose deeper-bodied males are more likely to become stranded and, because they stick up higher out of the water, are easier for hungry bears to bite than males in the components of the stock that have average, or even smaller-than-average, body depths. Egg size, preferred spawning sites, the size of young ...

Fear of 'foreigners' may slow scientific progress

...s before graduating, she probablywill find herself stranded once again. Hassan says she wants an education to help improvethe welfare of the Sudanese people, by advancingthe quality of medicine available to communitiesin her homeland. Such aspirations have served theUnited States--and the world--well in the p...

Portrait of a doomed Sea

...ting shoreline has left ports landlocked and boats stranded on dry sand. Commercial fishing was forced to halt twenty years ago. The few remaining fishermen commute by car to the water's edge. The waters that remain grow increasingly saline so only salt-resistant fish imported from elsewhere can endure them. ...

Discovering what genes do the high-throughput way

...se of RNA interference (RNAi) - introducing double stranded RNA into cells, to interfere with the expression o...t cells into 384-well dishes and then added double stranded RNA to each well. After three days, when the targeted gene should be inhibited, they stained the cel...

RNA lariat may tie up loose ends to decades-old mystery of retrovirus life cycle

... encoded in DNA, which is transcribed into single- stranded ribonucleic acid (RNA) and then translated into proteins. The genome of a retrovirus, on the other hand,starts as RNA, which must first be converted into double-stranded DNA. Early in this process, the partially built DNA has to shift from one end of...

New, non-radioactive screen for antimalarial compounds

...s based on fluorochrome binding to parasite double stranded DNA. Pico Green, a powerful fluorochrome developed by Invitrogen Corporation's Molecular Probes business enables detection of the malaria parasite in cell culture without the need for radioactive materials used in current methods. The new assay wil...

Traditional Inuit ice treks guided from space

...in June 1997 some 15 people from Pond Inlet became stranded on a detached 60 square metre ice floe and it was three days before they could be rescued. "The safety aspect is a crucial part of the service, as during the busiest times each spring a large part of the population can be out on ice," explained...

Pacific leatherback turtle could go extinct in 10 years

...em for the moon and walk toward them, leaving them stranded and unable to return to the ocean. Stronger protections to beaches in St. Croix and South Africa, for example, have allowed leatherback populations to begin rebounding. The ocean needs greater levels of protection and the fishing industry needs to...

Mammoths stranded on Bering Sea island delayed extinction

Woolly mammoths stranded on Pribilofs delayed extinction Fossil is first re...Bering Sea, Guthrie found that the mammoths became stranded on the Pribilofs about 13,000 years ago during the Holocene sea level rise after the last glacial ma...

Measuring artificial viruses to improve disease detection

... same basic chemical components in RNA (the single stranded version of DNA needed for protein synthesis.) They are constructed to be nearly identical chemically to real viruses but are encased with a protein covering to prevent degradation. The standards are currently used in research laboratories to help che...

Chemoradioimmunotherapy for advanced breast cancer: hope for the future?

...h the inclusion of a separate 21-nucleotide double stranded siRNA ('small interfering RNA') generated against DNMT1. It was hoped that the novel treatment regime would effectively target the tumour cells by blocking the genetic mechanisms that protect the cells from conventional treatment thereby allowing t...

Ocean scientists assess impact of seismic pulses in effort to protect whales

...meters [10 miles]. In 2002, two beaked whales were stranded in the Gulf of California at around the time R/V Maurice Ewing was conducting acoustic research in the area, but a causal relationship has not been established. Some beaked whale strandings have occurred in connection with Navy sonar operations at fr...

How an insidious mutation fools DNA replication

... by the National Cancer Institute. DNA is a double stranded molecule shaped like a spiral staircase. The two strands of the spiral are linked by sequences of molecular subunits, or bases, called nucleotides. The four nucleotides -- guanine, cytosine, adenine and thymine -- naturally complement one another lik...

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