HOME >> BIOLOGY >> NEWS
Life in a greenhouse world

nt component of Earth's atmosphere occurred at the same time as analogous evidence for the first cyanobacteria?'"

Schwartzman and Caldeira followed up the proposal of Charles Dismukes and coworkers that now extinct bacteria were performing oxygen-based photosynthesis before cyanobacteria came onto the scene. In a CO2 dominated world, these early oxygenic photosynthesizers split bicarbonate instead of water as the source of oxygen. They apparently boosted organic productivity and caused greater methane production by methanogens living in the ocean.

"It takes far less methane to maintain climatic temperatures than it does carbon dioxide," says Schwartzman.

As methane became dominant, CO2 levels dropped dramatically. Cyanobacteria then emerged and began oxygenic photosynthesis by splitting water as the source of oxygen. According to Schwartzman, only when atmospheric oxygen levels began to rise some 2.2 billion years ago did a CO2-concentrating mechanism emerge, an adaptation to declining CO2/02 ratios in the external environment.

Thus, global constraints on evolution appeared to have included carbon dioxide as well as oxygen levels in the atmosphere along with surface temperature. All the former have been strongly influenced by biological evolution in a complex set of feedbacks, an essential aspect of biospheric evolution. "The classical paradigm of evolution, that changes in the local environment lead to natural selection, should be rethought to include these feedbacks on a global scale. We hope that our hypothesis will be tested by looking more closely at the extant geologic record of the proposed transition as well as the insights from the study of photosynthesis and molecular biology of modern organisms," says Schwartzman.


'"/>

Contact: Ann Cairns
acairns@geosociety.org
303-357-1056
Geological Society of America
25-Oct-2002


Page: 1 2

Related biology news :

1. Plants will not save us from greenhouse gases
2. Environmental decontamination, greenhouse gases, and the genome of a methane-loving bacterium
3. New space-borne instrument to track greenhouse gases, ozone destroyers, and other pollutants
4. Continents played key role in collapse and regeneration of Earths early greenhouse, geologists say
5. Improved crop production and fewer greenhouse gases
6. UGA researchers track greenhouse gases in forests
7. Scientists find key to ocean bacterium that helps control greenhouse gas
8. Plant diversity threatened by climate change and buildup of greenhouse gas, study reveals
9. Shifts in rice farming practices in China reduce greenhouse gas methane
10. Agricultural science helping farmers reduce greenhouse gas
11. Prospect of greenhouse gas reduction drives biofuels market

Post Your Comments:
*Name:
*Comment:
*Email:
TAG: Life greenhouse world

(Date:4/23/2014)... 2 million Food Standards Agency (FSA) project to map ... workers. , Norovirus outbreaks can rapidly affect large ... frozen strawberries infected 11,000 people in Germany, but there ... strains cause infection and which foods are the most ... will produce data that will help the FSA to ...
(Date:4/22/2014)... Yale researchers will lead a five-year, $3 million study ... is affecting the transport of dissolved organic matter (DOM) ... could alter the chemical composition and water quality of ... from the National Science Foundation,s MacroSystems Biology program, researchers ... watershed, which begins in Canada and runs through five ...
(Date:4/22/2014)... RIVERSIDE, Calif. Inspired by the fist-like club ... by University of California, Riverside, in collaboration with University ... design structure for composite materials that is more impact ... , "The more we study the club of this ... improve so many things we use every day," said ...
Breaking Biology News(10 mins):Connecticut River watershed study will assess impacts of extreme rain events 2Connecticut River watershed study will assess impacts of extreme rain events 3Mantis shrimp stronger than airplanes 2Mantis shrimp stronger than airplanes 3
(Date:1/15/2014)... Rochester, NY (PRWEB) January 15, 2014 The ... cause a major disease. One of these latent viruses is ... is rheumatoid arthritis (RA). Rheumatoid arthritis (RA) is a chronic ... the theory, a study found that RA patients have high ...
(Date:1/15/2014)... 2014 2013 was a banner year ... Technologies®. They saw continued independent research led by the ... awarded a $1 million grant from the Susanne Marcus ... Behavior” a peer reviewed journal, Amy Grant highlighted Brainwave ...
(Date:1/15/2014)... AudioNotch is the internet's leading provider ... treatment of tinnitus. Patients listen to sound therapy that ... period of weeks to months, their tinnitus volume decreases. , ... Notched Music and Notched White Noise. Now, AudioNotch is pleased ...
(Date:1/14/2014)... Date: Friday, April 11, 2014 , Time: ... 1360 Almshouse Road, Warrington, Pa. , Details: The ... to finding a cure for hepatitis B and improving the ... annual Crystal Ball on Friday, April 11 at Warrington Country ...
Breaking Biology Technology:Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 2Study: Rheumatoid Arthritis (RA) Patients Have EBV; The CBCD Says this is Consistent with Microcompetition 3Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 2Dynamic Innovative Technology Showcased at Scottsdale Company’s Open House 3Hepatitis B Foundation to Host Annual Crystal Ball Gala 2
Cached News: