RESUMO
A scenario of the origin of the very first ribonucleoproteinoid virus-like complexes, which is based on their synthesis in the interlaminar spaces of clayish grain regolith of the primitive Earth, about 4 billion years ago when water in the form of liquid drops first appeared. The proposed model explains the origin of chirality of modern biopolymers as a result of preferential adsorption of biomonomers on such grains.
Assuntos
Silicatos de Alumínio , Modelos Biológicos , Adsorção , Biopolímeros/química , Argila , Ribonucleoproteínas/biossíntese , Estereoisomerismo , Vírus/metabolismo , ÁguaRESUMO
An analysis of the experimental data available and of the present theoretical concepts shows that even the initial physicochemical chemical precellular stages of biological evolution are impossible in the interstellar medium, while biomonomers possibly formed on asteroids and comets might have participated after transportation to the Earth in the final stages of the origin of the first precellular biological structures and then in the first living cells.
Assuntos
Silicatos de Alumínio/química , Poeira Cósmica , Elementos Químicos , Evolução Química , Meio Ambiente Extraterreno , Bentonita/química , Biopolímeros/biossíntese , Carbono/química , Argila , Origem da Vida , Estereoisomerismo , ÁguaRESUMO
The use of charge-coupled devices is suggested as a means for detecting growth of micro-organism colonies. The accuracy of the method is determined by channel width and the sensitivity by the signal/noise ratio. The method was tested on a dense nutrient medium, which is to be considered more suitable to micro-organisms of the dry Martian soil than the water solution of nutrients employed in the Viking's strategy.
