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:12/22/2014)... 22, 2014  The 2014 Holiday Season may be the ... Intelligence reports that the long anticipated floodgates for consumer ... demand for smart phones, tablets, and wearable mobile devices ... 2.5 billion users with nearly 4.8 billion biometric devices ...
(Date:12/17/2014)... DUBLIN , Dec. 15, 2014 Research and Markets ... of the "Samsung Galaxy S5 - Home Button ... offering. http://photos.prnewswire.com/prnh/20130307/600769 ... the iPhone 5S, Samsung introduces for the first time ...
(Date:12/17/2014)... 16, 2014  Automation is fundamentally transforming the travel experience ... borders. Over the past decade, ePassports, biometric readers, and ... process through border control via eGates and Automated Passport ... seaports, and land borders across the globe. ...
Breaking Biology News(10 mins):First Season of Holiday Shopping with Mobile Biometric Payments Wraps Up With a Present for Biometrics Industry: A Rosy Forecast for More Than 2 Billion Users of 4.8 Billion Mobile Biometric Devices by 2020 2Samsung Galaxy S5 - Home Button Synaptics Fingerprint Sensor Technology Analysis 2Automated Border Control (ABC) Transforms the Global Travel Experience With More Than 2500 ABC eGates and APC Kiosks Deployed In Airports, Seaports, and Land Borders Worldwide 2
... (UM) Rosenstiel School of Marine & Atmospheric Science Professors Shuyi ... Fellows of the American Meteorological Society (AMS), the nation,s leading ... Dr. Bruce Albrecht, who is a Fellow of the ... Award. The honor of Fellow is given to ...
... announced the 12 projects funded in a fourth ... (PIRE) awards. Many of these projects engage scientists ... energy alternatives, as the need for solutions challenges ... Agency for International Development (USAID) today also announced ...
... Texas at Austin have discovered that the lack of a ... neural tube birth defects in developing embryos. It ... dramatically reduces the incidence of neural tube defects, such as ... birth defects. In some populations, folic acid supplementation has decreased ...
Cached Biology News:Univ. of Miami profs Chen and Soden named Fellows of AMS, Albrecht receives AMS Teaching Award 2Univ. of Miami profs Chen and Soden named Fellows of AMS, Albrecht receives AMS Teaching Award 3NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 2NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 3NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 4NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 5NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 6NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 7NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 8NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 9NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 10NSF Supports GlobalNSF supports global research to advance science and engineering for sustainability 11Lack of key enzyme in the metabolism of folic acid leads to birth defects 2
(Date:1/22/2015)... Dr. Greg Leyer of UAS Labs recently was ... Pre-Conference seminar on probiotics in San Diego, CA. , ... conference for health care professionals. This year’s pre-conference seminar was ... in health. Dr. Leyer spoke about the emerging topics and ...
(Date:1/22/2015)... SAN DIEGO , Jan. 22, 2015   ... company, and Sequenom, Inc. (NASDAQ: SQNM ... a development agreement for next generation noninvasive prenatal ... Cypher,s genome interpretation technology, called Mantis™, to advance ...
(Date:12/24/2014)... Dec. 24, 2014  United Therapeutics Corporation (NASDAQ: ... MDT ) has submitted a pre-market approval application ... the use of Medtronic,s SynchroMed ® II implantable ... use with United Therapeutics, Remodulin ® (treprostinil) Injection ...
(Date:12/24/2014)... Louis, Missouri (PRWEB) December 23, 2014 GMO ... biotechnology company, Syngenta, are in the process of being consolidated ... case is In Re: Syngenta AG MIR 162 Corn Litigation, ... District of Kansas. , Management of the Syngenta GMO corn ...
Breaking Biology Technology:Cypher Genomics and Sequenom Announce Development Agreement 2Cypher Genomics and Sequenom Announce Development Agreement 3Cypher Genomics and Sequenom Announce Development Agreement 4United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 2United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 3United Therapeutics Announces Submission Of Pre-Market Approval Application For Implantable Drug Infusion System To Deliver Remodulin 4Carey Danis & Lowe Reports on Syngenta GMO Corn Transfer Order 2
... endured a hard struggle, and somehow survived where other ... same sites and domain names must face harsher realities ... Today without visibility, on e-commerce, Web sites are simply ... the right match, they only clash into the billions ...
... is leading the blog tools market space, has all the ... founders - husband-and-wife team of Ben and Mena Trott - ... and created Moveable Type, arguably the best and most widely ... company name represents the number of days between their birth ...
... agricultural and lawn care pesticides may cause injury to ... to a study conducted by researchers at ... in the May 2004 issue of Environmental Health ... Environmental Health Sciences, National Institutes of Health. , ,In ...
Cached Biology Technology:The mysteries and the future of Web sites 2The mysteries and the future of Web sites 3The mysteries and the future of Web sites 4Six Apart hits its adolescence 2Six Apart hits its adolescence 3Six Apart hits its adolescence 4Six Apart hits its adolescence 5Infertility linked to lawn chemicals by Marshfield Clinic researcher 2
... multicolor analysis in a modern flow cytometer, ... that are differentially labeled with fluorescent probes. ... typically used for cell labeling are broader ... a flow cytometers filters. Thus, the fluorescence ...
... number is a new product ... Cornings product number. If showing ... under the old Sigma-Aldrich number ... for assistance. ID clarifier: rack ...
... ActiveSight, the leading provider of ... design, offers fragment-based screening services to ... screening involves the binding of drug-like ... crystallized protein drug targets, allowing scientists ...
...
Biology Products: