Navigation Links
AGU journal highlights for March 29, 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. Elsevier launches new journal Algal Research
2. Flavor and the new Nordic cuisine: BioMed Centrals new scientific journal Flavor is launched
3. Canadian Journal of Cardiology publishes new atrial fibrillation guidelines
4. Tips from the journal mBio
5. AGU Journal highlights - Feb. 29 2012
6. Wiley-Blackwell adds 44 titles to journal publishing program in 2012
7. Georgetown hosts forum to discuss government request of journals to redact scientific data
8. Sustainable land use strategies to support bioenergy described in Industrial Biotechnology journal
9. Springer to publish journal and book series for Entomological Society of Brazil
10. Cell Press launches a new open-access journal, Cell Reports
11. Journal of American Dietetic Association becomes Journal of the Academy of Nutrition and Dietetics
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:12/10/2014)... 9, 2014     ...   Jifflenow, a ... solutions for business-to-business (B2B) events, today announced a ... mobile near-field communication (NFC), Bluetooth low energy (BLE), ... http://photos.prnewswire.com/prnh/20140612/691055) , Jifflenow will integrate its ...
(Date:12/4/2014)... PALM BEACH GARDENS, Fla. , Dec. 3, ... identity management solutions, today announced that its DigitalPersona ... 4500 fingerprint readers have been deployed throughout ... Carolina , South Carolina ... network headquartered in Southern Pines, North ...
(Date:11/21/2014)... 2014 According to a new ... (Video, RFID, Access Control, Intrusion Detection, Parking Management, Under ... Component Service Geography - Global Forecasts to 2020", published ... to be around $25 Billion in 2014 and is ... a CAGR of 8.69%. Browse 116 market ...
Breaking Biology News(10 mins):Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 2Jifflenow And ITN International Bring Cutting-Edge Badge Scanning Technology To B2B Events 3First Bank Partners with Crossmatch to Increase Log In Security 2First Bank Partners with Crossmatch to Increase Log In Security 3Industrial Security Systems Market Worth $38 Billion by 2020 2Industrial Security Systems Market Worth $38 Billion by 2020 3
... billion pairs of molecules that form the rungs of the ... the DNA they comprise transmits traits across generations in a ... sequence of letters in the code. ... is the physical manner in which DNA is spun around ...
... culminating with the latest findings on human evolution, 18 ... spanning three billion years of evolution at a two-day ... Thursday, May 1, and Friday, May 2 in the ... to the public. The modern science of evolution ...
... LAFAYETTE, Ind. - Chemical engineers have developed a "self-assembling" ... making diamondlike crystals to improve optical communications and other ... by positioning tiny particles onto a silicon template containing ... of a human hair. The template is immersed in ...
Cached Biology News:Scientists clarify a mechanism of epigenetic inheritance 2Scientists clarify a mechanism of epigenetic inheritance 3Rockefeller University hosts 2-day evolution symposium, May 1-2, 2008 2Findings a step toward making new optical materials 2Findings a step toward making new optical materials 3Findings a step toward making new optical materials 4Findings a step toward making new optical materials 5
(Date:12/22/2014)... GenomeDx Biosciences today announced that a new ... genomic test for prostate cancer, was able to predict ... radical prostatectomy without adjuvant therapy. Although rapid metastasis in ... tumor genomics to identify these men who have a ... advance. The study has been published online by ...
(Date:12/22/2014)... Illinois (PRWEB) December 22, 2014 ITRA ... tenants and occupiers of commercial real estate, has further ... new offices in Perth and Brisbane, Western Australia, reports ... of directors. , ITRA Global / ACORPP (Australian ... totally independent consultancy company providing property services to a ...
(Date:12/19/2014)... Charm Sciences is pleased to announce ... of Aflatoxin M1 in raw commingled milk is the ... validation. The peer reviewed report of the validation by ... Agricultural and Fisheries Research (ILVO-T&V) has been published by ... the most toxic aflatoxin and a known carcinogen, can ...
(Date:12/19/2014)... , Dec. 19, 2014  Roche (SIX: RO, ROG; ... Technologies, Inc. (Bina), a privately held company based ... USA. Bina provides a big data platform for ... (NGS) data. Bina,s proprietary on-market Genomic Management Solution, ... researchers to perform fast and scalable analyses to ...
Breaking Biology Technology:Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 2Study Published in European Urology Shows that the Decipher Prostate Cancer Classifier is Predictive of Rapid Metastasis in High-Risk Men who have had Prostate Surgery 3ITRA Global Continues International Expansion in Perth and Brisbane, Australia 2Charm Sciences Achieves Independent Validation of First 15 Minute Quantitative Screening Method for Aflatoxin M1 2Roche acquires Bina Technologies and enters the genomic informatics market 2Roche acquires Bina Technologies and enters the genomic informatics market 3
... BROOKFIELD, Wis.- Fiserv, Inc., an ATM and ... transfer network saw its volume increase more than 57% ... overall growth rate of 57% was tremendous and makes ... said Kevin Gregoire, Senior Vice President of Products and ...
... the great rock concert halls and rock festivals of the ... musical Meccas continues (mostly in the form of Farewell Tours ... wild 1980s and 1990s is celebrated every year in a ... lead the charge in promoting the hot biotech companies of ...
... outsourcing as an issue du jour. I stand corrected. ... year at that for America) due to slow job ... the U.S. Prominent voices along every point of the ... nomination to the Bush Administration and a host of ...
Cached Biology Technology:The Biotech Concert Halls of the Decade of 2000 2The Great Offshore Outsourcing Debate 2
S-100A10 (H-80)...
Vapor phase risers are available in various heights to accomodate a variety of inventory solutions. Risers are used to creat a false bottom in which the tanks platform rests and Liquid nitrogen is s...
... DNA and RNA endonucleolytically to yield ... DNA:RNA or RNA:RNA) are resistant to ... of enzyme (1). The enzyme is ... double-stranded DNA (2), for selective cleavage ...
SP6 RNA Polymerase, 50 l, 20 U/l ,Cap Scribe Buffer, 100 l, 5x conc....
Biology Products: