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esters
Recycling of archaeal biomass as a new strategy for extreme life in Dead Sea deep sediments
Natural attenuation of fatty acid methyl esters (FAME) in soil and groundwater
Initial investigations of the potential bacteriological and associated biochemical activity in oil sands mined in Northern Alberta
Microbial degradation of cellulosic material under intermediate-level waste simulated conditions
On the colorimetric measurement of aqueous Si in the presence of organic ligands and common pH buffering agents
Kaolinite-potassium acetate and halloysite-potassium acetate complexes prepared by mechanochemical, solution and homogenization techniques: a comparative study
EFFECTS OF COAGULATION-BATH TEMPERATURE AND MONTMORILLONITE NANOCLAY CONTENT ON ASYMMETRIC CELLULOSE ACETATE BUTYRATE MEMBRANES
KINETICS OF DESORPTION OF WATER, ETHANOL, ETHYL ACETATE, AND TOLUENE FROM A MONTMORILLONITE
Mineral ecophysiological data provide growing evidence for microbial activity in banded-iron formations
THE ADVANTAGE OF THIN SECTION PREPARATIONS OVER ACETATE PEELS IN THE STUDY OF LATE PALEOZOIC FUNGI AND OTHER MICROORGANISMS
Prokaryotes stimulate mineral H 2 formation for the deep biosphere and subsequent thermogenic activity
Microbial biosynthesis of wax esters during desiccation: Adaptation for colonization of the earliest terrestrial environments?
CATION EXCHANGE REACTIONS OF VERMICULITE WITH Cu-TRIETHYLENETETRAMINE AS AFFECTED BY MECHANICAL AND CHEMICAL PRETREATMENT
Molecular dynamics insight into the cointercalation of hexadecyltrimethyl-ammonium and acetate ions into smectites
Evaluation of the bioavailability of potentially harmful elements in urban soils through ammonium acetate–EDTA extraction: a case study in southern Italy
HDTMA IN THE INTERLAYERS OF HIGH-CHARGED LLANO VERMICULITE
The tension between CO 2 dissolved at relatively high atmospheric pressure in the Hadean ocean, and H 2 generated as ocean water oxidized ferrous iron during convection in the oceanic crust, was resolved by the onset of life. We suggest that this chemosynthetic life emerged within hydrothermal mounds produced by alkaline solutions of moderate temperature in the relative safety of the deep ocean floor. Exothermic reaction between hydrothermal H 2 , HCOO − and CH 3 S − with CO 2 was catalyzed in inorganic membranes near the mound's surface by mackinawite (FeS) nanocrysts and “ready-made” clusters corresponding to the greigite (Fe 5 NiS 8 ) structure. Such clusters were precursors to the active centers (e.g., the C-cluster, Fe 4 NiS 5 ) of a metalloenzyme that today catalyzes acetate synthesis, viz., the bifunctional dehydrogenase enzyme (ACS/CODH). The water, and some of the acetate (H 3 C.COO − ), produced in this way were exhaled into the ocean together as fluid waste. Glycine ( + H 3 N.CH 2 .COO − ) and other amino acids, as well as tiny quantities of RNA, generated in the same milieu were trapped within tiny iron sulfide cavities. Energy from the acetate reaction, augmented by a proton gradient operating through the membrane, was spent polymerizing glycine and other amino acids into short peptides upon the phosphorylated mineral surface. In turn these peptides sequestered, and thereby protected, the catalytically and electrochemically active pyrophosphate and iron/nickel sulfide clusters, from dissolution or crystallization. Intervention of RNA as a polymerizing agent for amino acids also led to an adventitious, though crude, process of regulating metabolism—a process that was also to provide genetic information to offspring. The fluxes of energy and nutrient available in the hydrothermal mound—commensurate with the requirements of life—encouraged differentiation of the first microbes into two separate domains. At the bifurcation the Bacteria were to specialize in acetogenesis and the Archaea into methanogenesis. Representatives of both these domains left the mound by way of the ocean floor and crust to colonize the deep biosphere. Once life had emerged and evolved to the extent of being able to reduce nitrogen for use in peptides and nucleic acids, light could have been used directly as an energy source for biosynthesis. Certain bacteria may have been able to do this, where protected from hard UV by a thin coating of chemical sediment produced at a sub-aerial hot spring operating in an obducted and uplifted portion of the deep biosphere. Embedded in fresh manganiferous exhalites, early photosynthetic bacteria could further protect themselves from radiation by adsorbing manganese on the membrane. Organization of the manganese with calcium, within a membrane protein, happened to result in a CaMn 3 O 4 cluster. In Mn(IV) mode this structure could oxidize two molecules of water, evolve waste oxygen, and gain four electrons and four protons in the process to fix CO 2 for biosynthesis. All these biosynthetic pathways had probably evolved before 3.7 Ga, though the reduced nature of the planet prevented a buildup of free atmospheric oxygen until the early Proterozoic.