Abstract Glycine plays an essential role in a variety of biological and biochemical processes. As the smallest amino acid, glycine is especially important studies prebiotic chemistry chemical evolution. The behaviour aqueous solution under ionizing radiation fields still not well understood. Understanding reaction mechanism environment may provide insights into complex processes involved synthesis. Such conditions could clues about environmental that might favour emergence life. Numerical...

A systematic search for aldehydes, ketones, and carboxylic acids was carried out in aqueous solutions of HCN, NH/sub 4/CN, CH/sub 3/CN, C/sub 2/H/sub that had received multikilogray doses /sup 60/Co ..gamma.. radiation. About 30 radiolytic products were identified, among them a large variety dicarboxylic tricarboxylic acids. Some might be significant interest molecular evolution studies prebiotic processes. They originate the free-radical-initiated chemical reactions where additional...

Cytosine is an essential chemical molecule in living systems, such as DNA and RNA, it astrobiology to study how behaves under probable primitive conditions. We looked at cytosine broke down aqueous solutions exposed high radiation levels learn more about stable might have been on the early Earth. conducted various types of analysis, ultraviolet-visible spectroscopy high-pressure liquid chromatography. also developed a computer model describe kinetic processes molecules involved system. This...

Abstract The aim of this work is to study the behaviour hydrogen cyanide (HCN) adsorbed onto mineral surfaces (sodium montmorillonite, a clay mineral) in different pH environments as possible prebiotic process for complexation organics. Our experimental results show that specific sites on surface increased concentration HCN molecules dependent values. Moreover, adsorption can occur through physical and chemical interactions enhanced by channel structure sodium montmorillonite....

In the recent decades, antibacterial peptides have occupied a strategic position for pharmaceutical drug applications and became subject of intense research activities since they are used to strengthen immune system all living organisms by protecting them from pathogenic bacteria. This work proposes simple easy statistical/computational method through peptide polarity index measure which an subgroup can be efficiently identified, that is, characterized high toxicity bacterial membranes but...

Hydrogen cyanide (HCN), an important precursor of organic compounds, is widely present in extraterrestrial environments. HCN also readily synthesized prebiotic simulation experiments. To gain insight into the radiation chemistry one most and highly versatile constituents cometary ices, we examined behavior over-irradiated frozen liquid solutions under ionizing radiation. The samples were exposed to gamma at a dose range from 0 up 419 kGy. Ultraviolet spectroscopy gas chromatography used...

Formic acid is consistently produced and detected in prebiotic chemistry experiments, constituting a precursor of many carboxylic acids amino acids. Its behavior with exposure to gamma radiation varies the pH solution concentration. This work aimed model different environmental conditions for formic under ionizing using system coupled differential equations based on chemical kinetics. An ensemble radiolysis reaction mechanisms was generated at 1.5 formate ion 9, both doses from 0 2 kGy. also...

Most adsorption and radiolysis experiments related to prebiotic chemistry studies are performed in distilled water or sodium chloride solutions. However, solutions do not represent the composition of primitive seas Earth. In this work, an artificial seawater with ion abundances Mg2+ > Ca2+ >> Na+ ≈ K+ SO42- Cl- was used, one that is different from average today. This named 4.0 Ga, since it better represents major constituents The adenine adsorbed onto montmorillonite studied. most important...

Abstract Hydrogen cyanide (HCN) is considered a fundamental molecule in prebiotic chemistry experiments due to the fact that it could have an important role as raw material form more complex molecules, well be intermediate chemical reactions. However, primitive scenarios which this might available been widely discussed. Hydrothermal systems abiotic reactors and ideal niches for evolution. Nevertheless, several shown high temperatures pressures adverse stability of organic molecules. Thus,...

Clay minerals have been implicated as a probable active surface for pre-biological chemical reactions occurring during the early evolution of Earth. In this context, it is very important to explain role these surfaces and how much solid involved in transformation that taking place at its surface. The aim work present experimental results from ultraviolet spectroscopy thermoluminescence behavior samples adenine poly A, nucleic acid components, adsorbed clay mineral (Na-montmorillonite)...

Abstract Formaldehyde is a precursor of sugars, which are compounds essential in all forms life and necessary molecule for prebiotic processes. This work focuses on evaluating the stability formaldehyde exposed to high radiation field simulating conditions primitive Earth, such as ocean or shallow waters. may have been formed from reactions atmosphere rainout processes reached water bodies. In our experiments, we employed γ found that was labile towards decomposed even at low irradiation...

This study focuses on the radiolysis (up to 36 kGy) of guanine and adenine (nitrogenous bases) adsorbed in hectorite attapulgite highlight potential role clays as protective agents against ionizing radiation prebiotic processes. In this framework, investigated nitrogenous bases' behavior two types systems: a) aqueous suspension adenine–clay systems b) guanine–clay solid state. research utilized spectroscopic chromatographic techniques for its analytical purposes. Regardless reaction medium...