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Periods in Biological News

Cantabrian cornice has experienced seven cooling and warming phases over past 41,000 years

... The research shows that there have been seven periods of cooling and warming in the Cantabrian cornice ... However, the study shows that during earlier periods at the end of the Late Pleistocene, the species that predominated during cold periods were rodents and insectivores that were ...

Scientists find elephant memories may hold key to survival

... groups an edge in the struggle for survival in periods of famine and drought, according to a recently ... become crucial to the survival of herds during periods of extreme climatic events." Dr Nathalie ... these old females and their memories of previous periods of trauma and survival would have meant all the ...

Brain tweak lets sleep-deprived flies stay sharp

... of things when they have to be awake for extended periods of time," says Shaw. "We have drugs now that can ... to sleep. They demonstrated that the flies have periods of inactivity where greater stimulation is required to rouse them. These periods begin at night; like human sleep they are cyclic ...

September Geology and GSA Today media highlights

... basins is less important during interglacial periods of high sea level, such as at present. Covault et ... area that is home to over two million people. periods of uplift and deflation have been documented for ... a period of uplift. Bodnar et al. propose that periods of uplift at Campi Flegrei are associated with ...

The last supper of the hominids establishes the times they lived at the sites

... in the environment", the paleontologist clarified. High and low periods of occupation After confirming the hypothesis in present-day animals ... dental marks are more diverse. "If the animals are hunted during long periods of occupation, more variable dental wear would be expected", Rivals ...

Super-sleepers could help super-sizers!

... these small molecules are believed to cause most of the damage during periods of re-awakening, increasing mitochondrial coupling does not seem to be a particularly good idea for animals that tend to exhibit short periods of spontaneous arousal during the dormancy period, in some cases even ...

Fatty foods -- not empty stomach -- fire up hunger hormone

... . Ghrelin is a hormone that was believed to accumulate during periods of fasting and is found in the body in high concentrations just before ... an explanation of what could have been happening during the longer fasting periods in these human studies," Tschp adds. "Without dietary fats, ghrelin peaks ...

The evolution of gene regulation

... depends on evolutionary criteria such as the population size and the periods over which environmental changes take place," says Gerland. "Our study may ... other criteria do in fact come into play: the population size and the periods over which the environmental changes stretch." Genetic regulation in ...

Human role in Indonesian polluting forest fires -- Guido van der Werf in Nature Geoscience

... The large forest fires that sweep through Indonesia in dry periods are not only the result of severe drought. A team of researchers, ... has only been the case since 1980. Kalimantan was fairly resistant to dry periods up until 1980, but since then Kalimantan has become far more prone to ...

Plants could override climate change effects on wildfires

... the types of vegetation that dominated the landscape during different time periods in the past. Like rings in a tree, different layers of sediment represent ... charcoal deposits in the sediment to determine fire frequency during time periods dominated by different vegetation. Finally, they compared their findings ...

January GEOLOGY media highlights

... large earthquakes have occurred in approximately the same regions for long periods of time, and they infer that future events will follow these large-scale ... in the central section of the caldera, and earthquake activity followed by periods of relative quiescence. Tizzani et al. investigate the cause of unrest by ...

Moderate use averts failure of type 2 diabetes drugs in animal model

... cells time to recover." Another potential option would be alternating periods of drug treatment with periods when the patient's symptoms are managed by insulin injection, Nichols ...

Hidden infections crucial to understanding, controlling disease outbreaks

... lead author. In addition, longer-term ups and downs can be seen over periods of three to five years, with many cholera cases reported during some periods and few during others. Explanations have been proposed for both the ...

University of Miami scientist uncovers miscalculation in geological undersea record

... abundant isotope, 12C. As plants preferentially incorporate 12C, during periods of high production of organic material the 13C/12C ratio of carbonate ... of the widely-held ideas regarding the elevation of CO 2 during specific periods of the Earth's geological history will have to be adjusted." ...

UCSB researcher leads worldwide study on marine fossil diversity

... scientists showed eventual recoveries in the diversity of fossils after periods of extinction - especially the extinction 250 million years ago between the Permian and Triassic periods (also known as the "mother of all mass extinctions") - Alroy said this ...

The good, the bad and the smelly: USGS at the 2008 Coral Reef Symposium

... present sea level? Geological history may provide an answer: two 500-year periods of non-growth of coral reefs occurred in the region 4.5 thousand years ago and 3,000 years ago. These periods of non-growth indicate times of environmental crises that predated modern ...

Astronaut health on moon may depend on good dusting

... return to the moon, astronauts will be exposed to lunar dust for longer periods of time, including missions that could last months. Due to the moons ... Microgravity Research Aircraft. These airplanes are used to provide short periods of reduced- and zero-gravity during a series of steep climbs and descents. ...

Magnet Lab researchers make observing cell functions easier

... more stable, microscopists can observe live cell dynamics for longer periods of time. The paper describing their work, Improving the Photostability of ... dynamic processes inside a cell to be observed at once -- and for longer periods of time. ...

Researcher provides tool to enable determination of age of anchovies with greater precision

... their relation with the oceanographic conditions present at the different periods of the year. The aim of the PhD thesis was to develop and apply this ... validated. The chemical marking was carried out, at least during short periods of captivity, using the soluble complex of calcium that both juvenile and ...

Antarctic life hung by a thread during ice ages

... team analyzed geologic and genetic records and found that during glacial periods the permanent sea-ice belt advanced much further to the North than it is ... stunning Antarctic fauna has evolved and coped with glacial-interglacial periods will help us to assess their sensitivity to current climate warming. ...

AGU journal highlights -- Jan. 28, 2008

... between 1999 and 2005 from Mars Global Surveyor. Those data include periods of maximum and minimum solar activity. The authors find that exosphere ... 2800 years, accentuating the anomalous nature of twentieth-century warmth. periods of widespread ice cap expansion during the Little Ice Age coincide with ...

Overeating and obesity triggered by lack of BDNF

... important distinction might help define disease mechanisms and critical periods of intervention for the treatment and prevention of obesity disorders, ... of these analyses. The amount of BDNF mRNA produced decreased during periods of fasting. However, when the mice were exposed to glucose, a ...

Stowers Institute's Hawley Lab identifies factors responsible for restart of meiotic cycle

... a suspended state until the female reaches sexual maturity. Extended periods of dormancy may last many years in organisms like humans, but shorter periods of meiotic arrest can be found in simpler, more easily studied species ...

Bioclocks work by controlling chromosome coiling

... day/night cycle: The plasmid is smaller and more tightly wound during periods of light than they are during periods of darkness. They also found that this rhythmic condensation disappears ...

Saudi Arabia's KAUST and IIT, Bombay to Collaborate on Scientific Research

... personnel (scientific, technical and administrative staff) for varying periods of time; to make use of each respective organizations facilities and ... exchange of students, postdoctoral fellows and junior faculty for varying periods of time. ...

Scientists find universal rules for food-web stability

... in their stability. Observable food webs are stable food webs, with the relationships between their species remaining constant over relatively long periods of time. Understanding complex systems such as food webs present major challenges to science. They can either be examined by observing natural ...

Protein handlers should be effective treatment target for cancer and Alzheimer's

... work to find drugs that adjust the activity of molecular chaperones and heat shock factors. She theorizes these drugs would be used for limited periods to avoid trading cancer for an increased risk of neurodegenerative disease or vice versa. "A lot of drugs, such as chemotherapeutic agents, can ...

UC San Diego engineer provides insights to decades-old DNA squabble

... coarse-graining," Arya explained. "You cannot simulate something as large as a chromatin fiber containing tens of nucleosomes at molecular detail for periods of time longer than a few nanoseconds. That will not tell you much. You need to reduce the complexity of the system without sacrificing important ...

Bizarre walking bat has ancient heritage

... and predators." A small secretive creature with velvety fur, the lesser short-tailed bat is New Zealand's only terrestrial mammal: it spends long periods on the ground in heavily forested areas, hunting insects and seeking out fruit, nectar and pollen. It also appears to have evolved a special ...

121 breeding tigers estimated to be found in Nepal

... in all potential habitats," says Dr. Rinjan Shrestha, Conservation Biologist with WWF Nepal. Previous studies had been undertaken in different time periods and at different spatial scales. "To derive information on both abundance and distribution of tigers, the current survey employed two methods - ...

C. difficile spores spread superbug

... range of environmental conditions. When humans shed spores in their faeces, those spores are capable of surviving dormant in the environment for long periods of time, under harsh conditions and in temperatures up to 70 C, before reintroduction and infection in a new human host. "We treated mice with ...

A 'heart healthy' diet and ongoing, moderate physical activity may protect against cognitive decline

... were administered to all participants. After adjusting for age, education, reproductive years, cigarette smoking, alcohol consumption, parity, and periods of amenorrhea, the researchers found that long-term strenuous activity was consistently associated with poorer performance on all eight of the tests; ...

Down Under dinosaur burrow discovery provides climate change clues

... environments. "This research helps us to better understand long-term geologic change, and how organisms may have adapted as the Earth has undergone periods of global cooling and warming," says Martin, a senior lecturer in environmental studies at Emory. Martin is also an honorary research associate at ...

Seals quickly respond to gain and loss of habitat under climate change

... change can drive the demographic and evolutionary processes that determine diversity within and among species. Tracking these processes during periods of change reveals mechanisms for the establishment of populations, and provides predictive data on response to potential future impacts, including ...

Explosive growth of life on Earth fueled by early greening of planet

... years, the researchers began to formulate a very different type of scenario for what led to complex life on Earth. Rather than a world subject to periods of life-altering catastrophes, they began to see a world that first greened up with primitive plants. "The greening of Earth made soils which ...

Virus-resistant grapevines

... to ripen. But it's a long way to the barrel. Even before the harvest, the grapevines have to overcome all kinds of obstacles. Extremely hot or rainy periods can destroy entire crops, not to mention the wide variety of pests that can appear on the scene. Bugs such as the vine louse or the rust mite, fungi ...

Triggering muscle development -- a therapeutic cure for muscle wastage?

... ALS, renal disease or cancer, for whom intensive exercise is not an option. It may even prove useful to ameliorate muscle loss resulting from long periods in zero-gravity conditions during space travel. Dr. Mark Lewis (University College London, UK) will present their latest results on how MGF exerts ...

Natural-born divers and the molecular traces of evolution

... the molecular sequence of myoglobin in small aquatic mammals such as beavers, muskrats and water shrews, which only dive for considerably shorter periods of time, to see if they could also find evidence for the same trend. Indeed, the net charge of the myoglobin molecule in aquatic rodents was twice ...

When palm trees gave way to spruce trees

... in French . For climatologists, part of the challenge in predicting the future is figuring out exactly what happened during previous periods of global climate change. One long-standing climate puzzle relates to a sequence of events 33.5 million years ago in the Late Eocene and Early ...

University of Leicester geologists demonstrate extent of ancient ice age

... Deep Time Climate project between the University of Leicester and British Geological Survey. The Ice Age occurred in the Ordovician and Silurian periods of geological time (part of the Early Palaeozoic Era), an interval that witnessed a major diversification of early marine animals including ...
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