Featured Research

from universities, journals, and other organizations

Abundant ammonia aids life's origins

Date:
March 7, 2011
Source:
Arizona State University
Summary:
An important discovery has been made with respect to the possible inventory of molecules available to early Earth. Scientists found large amounts of ammonia in a primitive Antarctic asteroid. This high concentration of ammonia could account for a sustained source of reduced nitrogen essential to the chemistry of life.

This is a portion of the asteroidal meteorite CR2 Grave Nunataks (GRA) 95229. A study published this week in the Proceedings of the National Academy of Sciences shows that researcher Sandra Pizzarello of Arizona State has discovered a high concentration of ammonia in this meteorite that could account for a sustained source of reduced nitrogen essential to the chemistry of life.
Credit: Sandra Pizzarello

An important discovery has been made with respect to the possible inventory of molecules available to the early Earth. Scientists led by Sandra Pizzarello, a research professor at Arizona State University, found large amounts of ammonia in a primitive Antarctic asteroid. This high concentration of ammonia could account for a sustained source of reduced nitrogen essential to the chemistry of life.

Related Articles


The work is being published in this week's Proceedings of the National Academy of Sciences (PNAS).

The finding of a high concentration of nitrogen-bearing molecules in an asteroidal environment shown by the new study is very provocative. Besides the noble gases, nitrogen is the fourth most abundant element in the Sun and the universe overall. On the Earth, it is an indispensable ingredient of the biosphere, being essential to DNA, RNA and proteins, i.e., it is necessary for life's information transfer and catalytic processes.

"All origins-of-life theories need to account for a sustained source of reduced nitrogen, in order to make amino acids and nucleobases," explained Pizzarello, who works in ASU's Department of Chemistry and Biochemistry in the College of Liberal Arts and Sciences.

On the early Earth, on the other hand, the prebiotic inventory of reduced nitrogen necessary for the formation of N-containing biomolecules has been difficult to predict. The hypotheses of a reducing atmosphere had initially allowed one to envision considerable ammonia abundance as well as evolutionary pathways for the production of amino acids (e.g., by Urey-Miller-type processes). However, the current geochemical evidence of a neutral early Earth atmosphere, combined with the known photochemical destruction of ammonia, has left prebiotic scenarios struggling to account for a constant provision of ammonia.

An abundant exogenous delivery of ammonia, therefore, might have been significant in aiding early Earth 's molecular evolution, as we should expect it to have participated in numerous abiotic as well as prebiotic reactions.

It is also interesting to note that the new PNAS work was made possible by the finding in Antarctica of these exceptionally pristine, ammonia-containing, asteroidal meteorites. Antarctic ices are good "curators" of meteorites. After a meteorite falls -- and meteorites have been falling throughout the history of Earth -- it is quickly covered by snow and buried in the ice. Because these ices are in constant motion, when they come to a mountain, they will flow over the hill and bring meteorites to the surface.


Story Source:

The above story is based on materials provided by Arizona State University. Note: Materials may be edited for content and length.


Journal Reference:

  1. S. Pizzarello, L. B. Williams, J. Lehman, G. P. Holland, J. L. Yarger. Abundant ammonia in primitive asteroids and the case for a possible exobiology. Proceedings of the National Academy of Sciences, 2011; DOI: 10.1073/pnas.1014961108

Cite This Page:

Arizona State University. "Abundant ammonia aids life's origins." ScienceDaily. ScienceDaily, 7 March 2011. <www.sciencedaily.com/releases/2011/03/110302091646.htm>.
Arizona State University. (2011, March 7). Abundant ammonia aids life's origins. ScienceDaily. Retrieved November 24, 2014 from www.sciencedaily.com/releases/2011/03/110302091646.htm
Arizona State University. "Abundant ammonia aids life's origins." ScienceDaily. www.sciencedaily.com/releases/2011/03/110302091646.htm (accessed November 24, 2014).

Share This


More From ScienceDaily



More Earth & Climate News

Monday, November 24, 2014

Featured Research

from universities, journals, and other organizations


Featured Videos

from AP, Reuters, AFP, and other news services

3D Map of Antarctic Sea Ice to Shed Light on Climate Change

3D Map of Antarctic Sea Ice to Shed Light on Climate Change

Reuters - Innovations Video Online (Nov. 24, 2014) A multinational group of scientists have released the first ever detailed, high-resolution 3-D maps of Antarctic sea ice. Using an underwater robot equipped with sonar, the researchers mapped the underside of a massive area of sea ice to gauge the impact of climate change. Ben Gruber reports. Video provided by Reuters
Powered by NewsLook.com
Car Park Solution for Flexible Green Energy

Car Park Solution for Flexible Green Energy

Reuters - Innovations Video Online (Nov. 24, 2014) A British solar power start-up says that by covering millions of existing car park spaces around the UK with flexible solar panels, the country's power problems could be solved. Suzannah Butcher reports. Video provided by Reuters
Powered by NewsLook.com
Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

Ebola-Hit Sierra Leone's Late Cocoa Leaves Bitter Taste

AFP (Nov. 23, 2014) The arable district of Kenema in Sierra Leone -- at the centre of the Ebola outbreak in May -- has been under quarantine for three months as the cocoa harvest comes in. Duration: 01:32 Video provided by AFP
Powered by NewsLook.com
NY Gov. on Flood Prep: 'prepared for the Worst'

NY Gov. on Flood Prep: 'prepared for the Worst'

AP (Nov. 23, 2014) First came the big storm. Now comes the big melt for residents of flood-prone areas around Buffalo. New York's governor says officials are preparing for the worst as the temperature is expected to rise and potentially melt several feet of snow. (Nov. 23) Video provided by AP
Powered by NewsLook.com

Search ScienceDaily

Number of stories in archives: 140,361

Find with keyword(s):
Enter a keyword or phrase to search ScienceDaily for related topics and research stories.

Save/Print:
Share:

Breaking News:

Strange & Offbeat Stories


Plants & Animals

Earth & Climate

Fossils & Ruins

In Other News

... from NewsDaily.com

Science News

Health News

Environment News

Technology News



Save/Print:
Share:

Free Subscriptions


Get the latest science news with ScienceDaily's free email newsletters, updated daily and weekly. Or view hourly updated newsfeeds in your RSS reader:

Get Social & Mobile


Keep up to date with the latest news from ScienceDaily via social networks and mobile apps:

Have Feedback?


Tell us what you think of ScienceDaily -- we welcome both positive and negative comments. Have any problems using the site? Questions?
Mobile: iPhone Android Web
Follow: Facebook Twitter Google+
Subscribe: RSS Feeds Email Newsletters
Latest Headlines Health & Medicine Mind & Brain Space & Time Matter & Energy Computers & Math Plants & Animals Earth & Climate Fossils & Ruins