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Tag: "ring" at biology news

Plant wounds trigger bacteria

...ing plasmid to do its dirty deed. The plasmid is a ring of DNA that is separate from the chromosome and is not essential for the bacterium's survival but is required for tumor growth. The plasmid can also transmit itself from one bacterial cell to another when the two cells touch one another, in bacterial...

Researchers find gland that tells fruit flies when to stop growing

...gland, part of a more complex structure called the ring gland, and send false signals about a fly's weight. Enlarging the gland by increasing insulin signaling triggered metamorphosis at smaller sizes than usual. Suppressing the gland's growth by decreasing insulin signaling allowed larvae to grow larger ...

Gaining ground in the race against antibiotic resistance

...lled alpha-lactamases, which chop the alpha-lactam ring in half, inactivating the drugs. An inhibitor for one type of lactamase has already been marketed as part of a 'package drug' with amoxicillin to fight resistance. But the lactamase enzyme that Vila's group studied is in a different class that is ca...

Team Invents Device For Weighing Individual Molecules

...e, shape, and composition, these tiny tuning forks ring at their own fundamental frequency of mechanical vibration, although at such a high pitch that the "notes" are nearly as high in frequency as microwaves. The researchers set up electronic circuitry to continually excite and monitor the frequency of ...

Africa to take it on chin again with climate change

...p lead to sinking air and drought in a surrounding ring that includes southern Africa. "In our models, the Indian Ocean shows very clear and dramatic warming into the future, which means more and more drought for southern Africa," says Hurrell. "It is consistent with what we would expect from an increase...

Key mechanism in genetic inheritance during cell division identified

...oteins form rings around the microtubules and this ring formation promotes microtubule assembly, stabilize...nd the Howard Hughes Medical Institute (HHMI). "If ring formation takes place in vivo, it could be the mechanism by which chromosomes are kept segregated du...

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