Artificial light-dark cycles expose circadian clocks at odds with each other
...t means the top half of the brain's main circadian clock can show a cycle of nearly 25 hours, which is norm...ht have a neural base within the brain's circadian clock itself," he said....Unnatural light-dark cycles expose duelling circadian clocks
... pushes the limits of the SCN's ability to set the clock to day length researchers have discovered within ...er as a result of artificial day/night cycles. One clock followed the artificially short 11-hr. day/11-hr. night schedule, while the other followed a longer ...How do animals exposed to 24-hour light retain their wake-sleep habits?
... start a family. For the scientist, the biological clock refers to a process that took millions of years to...ant for us to understand how the body's biological clock can respond to unnatural light clues and adapt to a changing environment. This study is another step...The biological clock: What really makes us tick
...fruit flies, then, also is pertinent to biological clock function in mammals. "Distinct rhythms are prese...e the consequences of problems that occur when the clock is damaged in humans." Also known as circadian rhythms, biological clocks offer scientific insight...Molecular mechanisms that trigger flowering in spring
...lete one cycle. Bnning proposed that the circadian clock may also control photoperiodism. He suggested that a rhythm generated by the circadian clock controls flowering, but that one stage of this rhythm is sensitive to light. In this way, flowering ...The Rosetta space probe's long trek to Comet 67P/Churyumov-Gerasimenko
... the road for ten years, during which time it will clock up in excess of five billion kilometres. Launch in February 2004 Rosetta will be waved off on 26 February when it lifts off from the space centre in Kourou, French Guiana, aboard an Ariane 5 launcher. Shortly after the spacecraft's release, its s...Winter weather turns on flowering gene
... have an answer: a gene that functions as an alarm clock to rouse certain plants from a vegetative state in...uggesting that the VIN3 gene functions as an alarm clock rousing biennial plants to bloom. But how do plants know they've been exposed to the right temper...Wright State biologist studies birds to learn how our stomachs convey thoughts of hunger
...ycles in birds to learn if we have a physiological clock in our stomach that determines when we get hungry....mammals and birds. His research in Japan involved clock genes, or genes that cycle in a daily pattern, that are found in the gut. "We want to understand how...Beagle 2 team still hopes to repeat Mars landing success
...ossible failure scenarios involving a reset of the clock hardware and a problem with a tilted antenna seem to have been ruled out. Today's successful transmission of signals from the Spirit rover via Mars Odyssey also indicates that the radio on board NASA's orbiter is working properly. Meanwhile, an attem...A big surprise: Young nerve cells can rewind their developmental clocks
... cortex that apparently controls the developmental clock of embryonic nerve cells, a finding that could ope..., the researchers found that they could rewind the clock in young cortical cells in mice by eliminating a gene called Foxg1. The finding could potentially fo...B2MIN9: Beagle 2 teams continue efforts to communicate with the lander
...ble cause of the communication failure is that the clock on Beagle 2 may have been reset as the result of a... computer glitch. An attempt was made to reset the clock during this morning's Odyssey pass, the first to take place during daylight hours at the Beagle 2 la...Mars mission scientist will live a 25-hour day
...arded with external stimuli running on the 24-hour clock to which their bodies are accustomed. "We decided we needed to get some serious advice in this area," says Squyres. When, jet-lagged and exhausted, he ran into Cornell sleep researcher James Maas at Pittsburgh airport in 2000, both realized that a c...Gene interactions control circadian clock in plants, study finds
...molecular mechanisms that keep a plant's circadian clock running on a 24-hour schedule. The study, reported...ponents interact might benefit agriculture, as the clock controls activities like flowering time in plants, said David Somers, a study co-author and an assis...First phylogeographic study of a rainforest tree
...d, which the authors used to calibrate a molecular clock for DNA sequences obtained from African and Neotropical populations and to estimate when these populations were separated. The study revealed that, although trees from different populations look the same, the evolutionary history of these population...Circadian clock genes may provide targets for new cancer drugs
...of Cancer (EORTC) in Boston. Tumor cell circadian clock genes are rhythmically expressed in coordination w...tudy to establish a relationship between circadian clock gene expression and the growth rate of tumors. "These results demonstrate that tumor growth itself, ...Clock cells, tumor suicide, tailored therapies among subjects of AACR-NCI-EORTC Conference
...t cancer often occurs when the timing of circadian clock genes is "off," resulting in an imbalance between cell proliferation and cell death. They believe these genes and their products represent novel targets for the control of cancer growth. Turning Tumors Against Themselves, by transforming the vas...Plants' circadian clocks tune into latitude to enhance fitness
...ned that natural variations in a plant's circadian clock correlate with the plant's latitude. C. Robertson ...ovember 7 issue of Science, the study examines the clock rhythms in Arabidopsis from different parts of the earth. The researchers analyzed leaf movements an...'Timeless' gene found to play key role as timekeeper in mammals
...ctional ability of timeless, leaving the circadian clock in disarray. The key difference between the previo...eraction of timeless with the five other mammalian clock genes (three forms of mPER, mClk and bmal) became clear. In normal and control-treated brain slices ...Resistance exercise resets the body clock
... and in the hypothalamus, a part of the brain. The clock in the hypothalamus is the central controller and ...und that exercise can also alter the expression of clock genes in the muscles themselves. The research team, headed by Bruce Conklin, analysed the expression...University of Chicago scientist wins prestigious Balzan Prize
.... Li was the first to show, in the 1980s, that the clock runs at a speed dependent on generation time: the ...ration, the faster the clock. So, for example, the clock runs five times as fast in rats and mice as in monkeys and man. This discovery has led to a better u...