Navigation Links
Fluctuating environment may have driven human evolution
Date:12/24/2012

rchers -- including Gail Ashley, professor of earth and planetary sciences, Rutgers University -- examined lake sediments from Olduvai Gorge in northern Tanzania. They removed the organic matter that had either washed or was blown into the lake from the surrounding vegetation, microbes and other organisms 2 million years ago from the sediments. In particular, they looked at biomarkers -- fossil molecules from ancient organisms -- from the waxy coating on plant leaves.

"We looked at leaf waxes because they're tough, they survive well in the sediment," said Freeman.

The team used gas chromatography and mass spectrometry to determine the relative abundances of different leaf waxes and the abundance of carbon isotopes for different leaf waxes. The data enabled them to reconstruct the types of vegetation present in the Olduvai Gorge area at very specific time intervals.

The results showed that the environment transitioned rapidly back and forth between a closed woodland and an open grassland.

To find out what caused this rapid transitioning, the researchers used statistical and mathematical models to correlate the changes they saw in the environment with other things that may have been happening at the time, including changes in the Earth's movement and changes in sea-surface temperatures.

"The orbit of the Earth around the sun slowly changes with time," said Freeman. "These changes were tied to the local climate at Olduvai Gorge through changes in the monsoon system in Africa. Slight changes in the amount of sunshine changed the intensity of atmospheric circulation and the supply of water. The rain patterns that drive the plant patterns follow this monsoon circulation. We found a correlation between changes in the environment and planetary movement."

The team also found a correlation between changes in the environment and sea-surface temperature in the tropics.

"We find complementary forcing mechanisms: one is the way Earth orbits,
'/>"/>

Contact: Sara LaJeunesse
SDL13@psu.edu
814-863-4325
Penn State
Source:Eurekalert  

Page: 1 2 3

Related biology news :

1. Environmental threat map highlights Great Lakes restoration challenges
2. Farm soil determines environmental fate of phosphorous
3. Association of Environmental Engineering and Science Professors name Environmental Engineering Science as its official journal
4. Prickly holly reveals ability to adapt genetics to environmental change
5. Messages that speak to conservatives morals narrow partisan gap on environment
6. Conservatives can be persuaded to care more about the environment
7. Environmental chemical blocks cell function
8. Fracking in Michigan: U-M researchers study potential impact on health, environment, economy
9. Bioengineered marine algae expands environments where biofuels can be produced
10. Devotes, a project to investigate marine biodiversity and the environment of European seas
11. Southampton to help develop new crops for water-stressed environments
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fluctuating environment may have driven human evolution
(Date:3/26/2015)... TORONTO , March 26, 2015 ... premier family, social, recreation and athletic club, today announced ... designed to allow freedom of movement for members and ... "Following a comprehensive process, we selected FST,s IMID ... sophistication and convenience for our members and staff, in ...
(Date:3/24/2015)... 2015 Research and Markets ( http://www.researchandmarkets.com/research/hdgz7h/global_iris ... Iris Recognition Market 2015-2019" report to their offering. ... market to grow at a CAGR of 23.5 percent ... the present scenario and the growth prospects of the ... calculate the market size, the report considers the revenue ...
(Date:3/24/2015)... --Research and Markets ( http://www.researchandmarkets.com/research/kvdtcw/face_and_voice ) has announced the ... Business Report" report to their offering. This report ... Thousands by the following Segments: Face Biometrics, and Voice Biometrics. The ... , Japan , Europe ... & Africa , and Latin ...
Breaking Biology News(10 mins):Granite Club First Private Club in North America to Implement FST Biometrics Secure Access Solution, as Part of Multi-million Dollar Expansion 2Global Iris Recognition Market 2015-2019 with 3M Cogent, Bioenable Technologies, Cross Match Technology, Iris ID Systems & Safran Dominating 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 2Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 3Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 4Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 5Face and Voice Biometrics - Global Strategic Business Report 2015: Face Recognition Gains Prominence in Immigration Control 6
... have shown that some simple biodegradable liquids can stop ... could significantly impact medicine. , When the liquid, composed ... wounds, the peptides self-assemble into a nanoscale protective barrier ... the injury heals, the nontoxic gel is broken down ...
... Now, a St. Louis-area teenage boy and a computer ... conducted by a team of neurosurgeons, neurologists, and engineers ... boy, a 14-year-old who suffers from epilepsy, is the ... Invaders, using only the signals from his brain to ...
... study appearing in the forthcoming issue of The American ... Svata M. Louda (all of the University of Nebraska, ... eaten at the same rate. , Plant-insect ecologists ... quality or defective chemistry of plant tissues. However, the ...
Cached Biology News:MIT material stops bleeding in seconds 2MIT material stops bleeding in seconds 3Teenager moves video icons just by imagination 2Teenager moves video icons just by imagination 3
(Date:3/27/2015)... YORK , March 27, 2015  Peter Walter ... Biomedical Science for his pioneering work on how proteins ... components of a regulatory mechanism that cells use to ... Dr. Walter is a professor of biochemistry at the ... groundwork for treating a range of human diseases related ...
(Date:3/27/2015)... , March 27, 2015 Working in ... Hospital in London , Richmond Pharmacology is ... global Phase 3 study for an investigational RNAi therapeutic being ... disease affecting the nerves and heart. Read ... Based at St Georges University of ...
(Date:3/27/2015)... 2015 WuXi PharmaTech (Cayman) Inc. (NYSE: ... and technology platform company serving the global pharmaceutical, ... an Investigational New Drug (IND) application for WuXi ... has been accepted for review by the China ... In September 2012, MedImmune, the global biologics research ...
(Date:3/27/2015)... ROCKVILLE, Md. , March 27, 2015  CASI ... dedicated to the acquisition, development and commercialization of innovative ... the global market with a commercial focus on ... the three and 12 months ended December 31, 2014.  ... of ($1.6 million), or ($0.05) per share, for the ...
Breaking Biology Technology:German-born cell biologist Peter Walter wins the 2015 Vilcek Prize in Biomedical Science 2German-born cell biologist Peter Walter wins the 2015 Vilcek Prize in Biomedical Science 3Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 2Investigational New Drug Application for WuXi MedImmune's Monoclonal Antibody Accepted for Review by CFDA 3CASI Pharmaceuticals Reports 2014 Fourth Quarter And Full Year Financial Results 2CASI Pharmaceuticals Reports 2014 Fourth Quarter And Full Year Financial Results 3CASI Pharmaceuticals Reports 2014 Fourth Quarter And Full Year Financial Results 4CASI Pharmaceuticals Reports 2014 Fourth Quarter And Full Year Financial Results 5CASI Pharmaceuticals Reports 2014 Fourth Quarter And Full Year Financial Results 6
... California and AMSTERDAM, October 3, 2011 ... that the company successfully completed a recent, routine inspection ... and Drug Administration (FDA). Agendia received FDA 510(k) clearance ... 2007. It remains the first and only test of ...
... Biopharmaceuticals, Inc. (Inspiration) today announced that the European Medicines ... the Marketing Authorization Application (MAA) for Inspiration,s IB1001, a ... prevention of bleeding in individuals with hemophilia B.  In ... begin its regulatory review process of the MAA. ...
... GRAZ, Austria, September 30, 2011 ... attracts international attention with a big mile stone. ... validated CNAP blood pressure wave offers the possibility ... the recently released product innovation CNAP-PPV, proves to ...
Cached Biology Technology:Agendia Successfully Completes Bi-Annual FDA Inspection 2Inspiration Biopharmaceuticals Announces Acceptance of European Marketing Authorization Application for IB1001 for the Treatment of Hemophilia B 2Inspiration Biopharmaceuticals Announces Acceptance of European Marketing Authorization Application for IB1001 for the Treatment of Hemophilia B 3International Study Confirms CNSystems-Technology 2
One bottle containing 30 ml of protein solution and 0.1% sodium azide....
No description available in Ensembl Antigen: Recombinant Protein Epitope Signature Tag (PrEST)....
Used in May-Grunwald Giemsa stain....
Sheep polyclonal to Quinolone ( Abpromise for all tested applications). Antigen: Norfloxacin(N)conjugated to BSA...
Biology Products: