9Aug/070
GLOBAL WARMING TO STEP UP AFTER 2009
Global warming is foresee to set in with a reprisal after 2009, with during slightest half of a 5 following years approaching to be hotter than 1998, a warmest year upon jot down, scientists inform.
9Aug/070
SPRING-LOADED MECHANISM OF DNA UNWINDING BY HEPATITIS C VIRUS NS3 HELICASE
Science, Vol. 317, No. 5837. (27 July 2007), pp. 513-516.NS3, an essential helicase for replication of hepatitis C virus, is a model enzyme for investigating helicase function. Using single-molecule fluorescence analysis, we showed that NS3 unwinds DNA in discrete steps of about three base pairs (bp). Dwell time analysis indicated that about three hidden steps are required before a 3-bp step is taken. Taking into account the available structural data, we propose a spring-loaded mechanism in which several steps of one nucleotide per adenosine triphosphate molecule accumulate tension on the protein-DNA complex, which is relieved periodically via a burst of 3-bp unwinding. NS3 appears to shelter the displaced strand during unwinding, and, upon encountering a barrier or after unwinding >18 bp, it snaps or slips backward rapidly and repeats unwinding many times in succession. Such repetitive unwinding behavior over a short stretch of duplex may help to keep secondary structures resolved during viral genome replication. 10.1126/science.1144130
9Aug/070
ELASTIC WIRE STRETCHES OUT LIKE ACCORDION
Elastic circuits which widen to some-more than twice their lengths could lead to brand new inclination which can hook with the person's physique, inside as well as out, developers contend.
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