Navigation Links
September Geology and GSA Today media highlights
Date:8/28/2007

tric tons gold) to be 287.5 1.7 Ma (millions of years before present). These results suggest a possible link between gold mineralization and intrusion into the crust of ca. 290 Ma regional granitoid magmas. This temporal association was previously clouded because commonly used geochronometers are unable to accurately and/or precisely date the gold mineralizing event directly. Isotopic compositions of Os and helium provide important new constraints on potential metal and fluid sources to the deposit, including a small but detectable mantle contribution to the ore system. These new results provide a more comprehensive understanding of one of Earths giant gold accumulations, and rule out several current hypotheses for its origin.


Mesoproterozoic carbon dioxide levels inferred from calcified cyanobacteria
Linda C. Kah, University of Tennessee, Department of Geological Sciences, Knoxville, TN 37996, USA; and and Robert Riding, School of Earth, Ocean, and Planetary Sciences, Cardiff University, Cardiff CF10 3YE, UK. Pages 799-802.

Determining the concentration of carbon dioxide in the ancient atmosphere remains a critical hurdle to understanding Earth surface temperatures, compositional changes in atmospheric chemistry, and the evolution of Earths earliest biosphere. Kah and Riding report the finding of petrographic fabrics in 1.2-billion-year-old carbonate strata that suggest the process of cyanobacterial calcification. When ambient atmospheric partial pressure of CO2 (pCO2) concentrations fall below roughly 10 times present atmospheric levels (PAL), cyanobacteria begin to use a combination of dissolved carbonate species (CO32- and HCO3-) in the photosynthetic production of organic matter. The cyanobacteria, however, must perform a series of biochemical gymnastics to utilize HCO3- in this process. As a byproduct of these biochemical changes, the pH of the microbial sheath rises dramatically and induces the precipitation of calcium carb
'/>"/>

Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
Source:Eurekalert

Page: 1 2 3 4 5 6 7 8 9 10 11 12

Related biology news :

1. Great White shark evolution debate involves WSU Lake Campus geology professor
2. Team of international scientists departs today to discover the unknown in Chinas Himalayan region
3. Todays babies are fatter babies
4. Gene sequencing explains bioremediation bug
5. FDA Warns Consumers Not to Use Home-Use Diagnostic Kits Marketed by Globus Media
6. Activation of thermoreceptors mediates raw garlics burning pungency
7. A hope for oil spill bioremediation
8. Leading scientists rank endangered dolphins, porpoises most in need of immediate action
9. Several minute intermediate stage in virus-cell fusion discovered; opportunity for drug development
10. HIV accessory protein disables host immunity via receptor-protein intermediary
11. New journal article urges use of animal serum-free media for growing live cells
Post Your Comments:
*Name:
*Comment:
*Email:
(Date:8/19/2014)... crocodiles colonised the seas during warm phases and became ... study which establishes a link between marine crocodilian diversity ... of more than 140 million years. , The ... de Lyon, France and formerly from the University of ... Communications ., Today, crocodiles are ,cold-blooded, animals that mainly ...
(Date:8/19/2014)... The University of Texas Health Science Center at San ... (UTSA) today announced the awarding of more than $750,000 ... (SALSI) Innovation Challenge. , Launched in 2003, SALSI is ... and an academic health science center join forces for ... funds collaborative studies, with a focus on public health ...
(Date:8/19/2014)... has been awarded a nearly $40,000 grant from the ... office of the National Park Service (NPS) and U.S. ... one-year study of the energy efficiency and cost effectiveness ... humid climates. , Radiant barriers are reflective thermal insulations ... back, thereby reducing the amount of heat emitted in ...
Breaking Biology News(10 mins):Evolution of marine crocodilians constrained by ocean temperatures 2San Antonio Life Sciences Institute awards $750,000 to innovators 2San Antonio Life Sciences Institute awards $750,000 to innovators 3UTSA researcher awarded $38K+ to evaluate energy efficiency options for historic homes 2UTSA researcher awarded $38K+ to evaluate energy efficiency options for historic homes 3
... vegetative cover, strong winds, dry, non-cohesive sandy soils, ... resources of Abu Dhabi Emirate in the United ... stresses, including wind erosion, salinization, waterlogging, landfilling, and ... Dhabi Emirate, land degradation is a matter of ...
... have found a way to save time, money and ... shed light on the biological processes associated with all ... genetics, and postdoctoral associate Matthew C. Hale have provided ... necessary with recent advances in DNA sequencing technology. Instead, ...
... Pfizer Inc., a major biopharmaceutical company, and the Wisconsin ... licensing organization for the University of Wisconsin-Madison, announced May ... embryonic stem (hES) cell patents for the development of ... the rights to work with hES cells for drug ...
Cached Biology News:Wind, salt and water are leading indicators of land degradation in Abu Dhabi 2Random picks better than complicated process in gene identification 2WARF signs license agreement with Pfizer for human embryonic stem cells 2
(Date:8/19/2014)... 2014 XenoTech announces an exclusive ... metabolite production from bioactive small molecules. Based ... technology enables convenient and timely assessment of critical ... Vice President of Commercial Operations, Christian Darabant, “the ... risk can be measured directly by comparison with ...
(Date:8/19/2014)... /PRNewswire/ - iCo Therapeutics Inc. ("iCo" or "the Company") ... its Oral Amphotericin B (Oral Amp B) drug ... by ImmuneCarta®, the immune monitoring business unit of ... Oral Amp B in reactivating latent HIV viral ... treatment with antiretroviral therapy. Memory ...
(Date:8/18/2014)... FREDERICK, Md. , Aug. 18, 2014 ... the maker of advanced consumer medical devices ... Kotak was interviewed by CEOLIVE.TV as ... The entire interview is available at ... interview Dr. Kotak explains to investors the ...
(Date:8/18/2014)... , August 18, 2014 ... Systems Market, By Application (Municipal Wastewater Treatment and ... Sheet and Multi Tubular), By Configuration (Internal/Submerged and ... published by MarketsandMarkets, The market for membrane bioreactor ... 2019, growing at a CAGR of 15.28% between ...
Breaking Biology Technology:Beyond Metabolite Identification, Testable Quantities Now Offered by XenoTech 2Beyond Metabolite Identification, Testable Quantities Now Offered by XenoTech 3iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 2iCo Therapeutics Announces Positive Oral Amphotericin B Study Results 3BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 2BioElectronics EVP Dr. Deepak Kotak Interviewed on CEO Live 3Membrane Bioreactor Systems Market Worth $2,927 Million by 2019 2Membrane Bioreactor Systems Market Worth $2,927 Million by 2019 3
... AtheroNova Inc. (OTCBB: AHRO) ("AtheroNova"), a biotech company ... to regress atherosclerotic plaque, announced the recent presentation ... Division of Cardiology at the David Geffen School ... Heart Association (AHA) Scientific Sessions in Orlando, Florida.  ...
... 2011  If algae is to be the solution for America,s ... make that a reality. Applications are now available for continuing ... retrain workers as general science technicians in the rapidly expanding ... Approximately 55 students will begin classes in ...
... 22, 2011 Sequenom, Inc. (NASDAQ: SQNM ), ... announced the Company,s participation at the 23rd Annual Piper Jaffray ... November 29-30, 2011. Ronald M. Lindsay, Ph.D., ... Maier, CFO, will present on Tuesday, November 29, 2011 beginning ...
Cached Biology Technology:AtheroNova Inc. Preclinical Study Demonstrates 95% Reduction in Arterial Plaque Formation 2Free Job Training: 55 Grants Available to Retrain Workers for Biofuels Industry 2Free Job Training: 55 Grants Available to Retrain Workers for Biofuels Industry 3Sequenom Announces Participation at the 23rd Annual Piper Jaffray Healthcare Conference 2
... bioassays for interferons are cytopathic effect inhibition assays, ... Sample types include; tissue culture supernatents; serum from ... assays, one unit is defined as the quantity ... cytopathic effect of viral infection by 50%. ...
... cytopathic effect inhibition assays, also known as CPE ... culture supernatents; serum from PK studies and delivery ... defined as the quantity of interferon required per ... infection by 50%. All standards used ...
... bioassays for interferons are cytopathic effect inhibition assays, ... Sample types include; tissue culture supernatents; serum from ... assays, one unit is defined as the quantity ... cytopathic effect of viral infection by 50%. ...
...
Biology Products: