Navigation Links
AGU journal highlights for April 16, 2012
Date:4/16/2012

of moist air from the south, sparking the onset of central Asian desertification. Or, perhaps, the supposedly arid region to the northeast of the Tibetan Plateau harbored shallow lakes or wetlands until as recently as 8 million years ago, at which point the historical desertification was initiated by some other mechanism. The current debate between these two proposals, of either a 22- or 8-million-year-old onset of desertification, hinges, to a sizeable degree, on the history of the fine sediments of the Tianshui Basin in central China.

One line of research, which looked at grain sizes, rock magnetic properties, and bulk geochemistry, among other factors, suggested that the early Miocene sediments were transported to the Tianshui Basin by the wind. The existence of wind-borne sediment, known as loess, would support the 22-million-year desertification hypothesis. Other researchers, however, suggest that though many of the sediment properties are similar to loess, they also show a good match for lake bed or wetland material.

To discriminate between the two hypotheses, Peng et al. measured the chain length distributions of n-alkanes-a type of hydrocarbon found in waxy plant material-from preserved organic material found in Tianshui Basin sediment samples. Long n-alkane chains, those with 27-31 carbon atoms, mainly stem from terrestrial plants, while midsized chains, with 23-25 carbon atoms, derive from aquatic plants or wetland flora. The authors find an abundance of the shorter carbon chains in the Tianshui sediments, an important difference from nearby loess samples. Supported by the observation of preserved pollen and algae, the authors suggest that the Miocene Tianshui Basin was a lake, mudflat, or floodplain region and not the arid loess hypothesized by some researchers.

Source: Geophysical Research Letters, doi:10.1029/2012GL050934, 2012

Contact: Mary Catherine Adams
mcadams@agu.org
202-777-7530
American Geophysical Union
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8

Related biology news :

1. AGU journal highlights for March 29, 2012
2. Elsevier launches new journal Algal Research
3. Flavor and the new Nordic cuisine: BioMed Centrals new scientific journal Flavor is launched
4. Canadian Journal of Cardiology publishes new atrial fibrillation guidelines
5. Tips from the journal mBio
6. AGU Journal highlights - Feb. 29 2012
7. Wiley-Blackwell adds 44 titles to journal publishing program in 2012
8. Georgetown hosts forum to discuss government request of journals to redact scientific data
9. Sustainable land use strategies to support bioenergy described in Industrial Biotechnology journal
10. Springer to publish journal and book series for Entomological Society of Brazil
11. Cell Press launches a new open-access journal, Cell Reports
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:7/24/2014)... 24, 2014) Scientists at The New York ... step closer to creating a viable cell replacement ... cells. , For the first time, NYSCF ... from skin samples of patients with primary progressive ... protocol to induce these stem cells into becoming ...
(Date:7/24/2014)... two factors that characterize sustainable university and college ... qualified physics teachers. Specifically, one or more faculty ... in combination with institutional motivation and commitment can ... Engineering and Math (STEM) teacher shortages are especially ... way for institutions seeking to increase the number ...
(Date:7/24/2014)... own microbial terroir, meaning the microbial populations found on ... product, creating the final flavor according to research published ... Environmental Microbiology . This is the first time investigators ... , Many sake makers inoculate with both bacteria ... the University of California, Davis, but he and his ...
Breaking Biology News(10 mins):NYSCF scientists 1 step closer to cell therapy for multiple sclerosis patients 2Creating sustainable STEM teacher preparation programs 2The microbes make the sake brewery 2
... studied interactions between the loggerhead turtle ( Caretta caretta ) ... water surface, mass beachings, and the effects of climate change ... marine species without causing economic losses for fishermen, the scientists ... carried out by night and in areas more than 35 ...
... EAST LANSING, Mich. A team of Michigan State ... created have uncovered the inner workings of a ... develop new medicines or understand how enzymes repair DNA. ... bacterial enzyme that is important in metabolism. Enzymes in ...
... Copenhagen summit to draft a legally binding agreement on the ... that we will see further rapid changes in the global ... the planet,s most vulnerable species at this time of unprecedented ... on 26 February 2010 in the Journal of Experimental ...
Cached Biology News:How can accidental captures of loggerhead turtles be reduced? 2MSU scientists unlock key enzyme using newly created 'cool' method 2Tackling the challenges of survival in a changing world 2Tackling the challenges of survival in a changing world 3
(Date:7/24/2014)... and synthetic processes prefer to settle into equilibriuma ... is within the realm of non-equilibrium conditions where ... in energy and phases, such as temperature fluctuations, ... humans to regulate their body temperature, airplanes to ... activity. , But even though these conditions ...
(Date:7/24/2014)... Your cell phone may stay ... battery storage capacity. , New research indicates that ... created at Lawrence Livermore National Laboratory ... carbon components will perform as electrodes. , The ... need for higher-performance batteries. Several key characteristics of ...
(Date:7/24/2014)... (PRWEB) July 24, 2014 Three companies ... semi-finalists in Livestrong’s Big C Competition. Out of 700 ... each headed to the semi-final round. In this round ... three-month accelerator program, complete with mentoring from thought-leaders and ... As part of the angelMD commitment to the Livestrong ...
(Date:7/24/2014)... July 24, 2014 WIRB-Copernicus Group ® ... and ethical review services for clinical research, announced ... a division of Richmond, VA ... biosafety and biosecurity consulting firm in ... WCG,s biosafety division – WCG Biosafety™ – will ...
Breaking Biology Technology:New approach to form non-equilibrium structures 2Getting More Life out of Lithium-ion Batteries 23 angelMD Startups Make Livestrong Big C Semi-finals 2WIRB-Copernicus Group Announces Acquisition of Alliance Biosciences; Executives Join WCG Biosafety Division 2WIRB-Copernicus Group Announces Acquisition of Alliance Biosciences; Executives Join WCG Biosafety Division 3
... in Pharmaceutical Thin Film,Technology -, WARREN, N.J., ... specializing in quick dissolving thin film pharmaceutical products,today ... No. 7,425,292 from the,United States Patent and Trademark ... to issue on September 16, 2008, relates,to the ...
... Calif., Sept. 11 Neurobiological,Technologies, Inc. (NTI(R)) (Nasdaq: ... fourth quarter and year-end financial results on September,16, 2008., ... discuss its financial results.,Details for the fiscal year-end call ... 16, 2008 -- Time: 10:30 a.m. ET, 9:30 ...
... Deliver Yield Benefits and Value to Farmers, LONDON, ... a significant growth opportunity in continuing to create more ... and,breeding, leading to more than doubling the company,s 2007,s ... biotechnology, will,tell investors. Padgette will deliver his remarks as ...
Cached Biology Technology:MonoSol Rx Granted Strategic US Patent for Thin Film Manufacturing Process 2MonoSol Rx Granted Strategic US Patent for Thin Film Manufacturing Process 3Neurobiological Technologies Announces Dates for 2008 Fiscal Year End Financial Results Conference Call and Presentation at MCF Investor Summit 2Monsanto Sees Growing Opportunity for Biotech Traits Globally 2Monsanto Sees Growing Opportunity for Biotech Traits Globally 3Monsanto Sees Growing Opportunity for Biotech Traits Globally 4
... involves the optimization of immunostaining. ... of the primary antibody, selection ... (e.g. Alk. Phos., HRP, fluorescence, ... detection, evaluation by light or ...
Request Info...
... 9001:2000 Certified USDA Research Registered OLAW Assured ... Training AALAS Certified Technicians Documentation ... Documentation Upon Request Focus CRP ... all your custom immunology service needs. ...
Request Info...
Biology Products: