Biography:

In the past Steven B. Charnley has collaborated on articles with José C. Aponte and Yi-Jehng Kuan. One of their most recent publications is Chirality of meteoritic free and IOM-derived monocarboxylic acids and implications for prebiotic organic synthesis. Which was published in journal Geochimica et Cosmochimica Acta.

More information about Steven B. Charnley research including statistics on their citations can be found on their Copernicus Academic profile page.

Steven B. Charnley's Articles: (3)

Chirality of meteoritic free and IOM-derived monocarboxylic acids and implications for prebiotic organic synthesis

AbstractThe origin of homochirality and its role in the development of life on Earth are among the most intriguing questions in science. It has been suggested that carbonaceous chondrites seeded primitive Earth with the initial organic compounds necessary for the origin of life. One of the strongest pieces of evidence supporting this theory is that certain amino acids in carbonaceous chondrites display a significant l-enantiomeric excess (ee), similar to those use by terrestrial life. Analyses of ee in meteoritic molecules other than amino acids would shed more light on the origins of homochirality. In this study we investigated the stereochemistry of two groups of compounds: (1) free monocarboxylic acids (MCAs) from CM2 meteorites LON 94101 and Murchison; and (2) the aliphatic side chains present in the insoluble organic matter (IOM) and extracted in the form of monocarboxylic acids (MCAs) from EET 87770 (CR2) and Orgueil (CI1). Contrary to the well-known ee observed for amino acids in meteorites, we found that meteoritic branched free and IOM-derived MCAs with 5–8 carbon atoms are essentially racemic. The racemic nature of these compounds is used to discuss the possible influence of ultraviolet circularly polarized light (UVCPL) and aqueous alterations on the parent body on chirality observed in in carbonaceous chondrites.

Searches for interstellar molecules of potential prebiotic importance

AbstractInterstellar chemistry leads to the formation of many prebiologically important molecules and is therefore of the fundamental interest to Astrobiology. Many organics can be produced in the gas phase where they can be detected. Molecules formed by reactions on the surfaces of dust grains are also best detected by millimeter-wave observations of sources in which the products of grain-surface chemistry have been deposited into the gas phase. In this article, we present a summary of the status of several searches for potential prebiotic molecules – aziridine, 2H-azirine, pyrimidine and glycine – in the hot molecular cores Sgr B2(N-LMH), W51 e1/e2 and Orion KL. Detections of these organic molecules would strengthen the thesis that interstellar organic matter, delivered in cometary impacts, could have played an important role in the prebiotic chemistry of the early Earth.

Astronomical searches for nitrogen heterocycles

AbstractWe have conducted extensive astronomical searches for the N-bearing ring molecules pyridine, quinoline and isoquinoline towards the circumstellar envelopes of carbon-rich stars, and for interstellar pyrimidine in hot molecular cores. Here we report the derived upper limits on the column densities of these molecules, and summarize the current status of these observations.

Advertisement
Join Copernicus Academic and get access to over 12 million papers authored by 7+ million academics.
Join for free!

Contact us