(1) Alkaline phosphatase and abiogenic inorganic polyphosphate were found to incorporate 32P-orthophosphate under similar experimental conditions.
(2) The necessity of the strong mirror-symmetry breaking in the abiogenic formation of the self-replicating oligonucleotide structures is discussed in the context of prebiological evolution.
(3) The significance of the synthesized substances is discussed in connection with the problem of abiogenic synthesis of peptides.
(4) The data obtained indicate the reality of abiogenic synthesis of nucleoside-like substances from the mixture of dry preparations of adenine and deoxyribose in the lithosphere during chemical evolution.
(5) The formation of the above mentioned organic compounds is associated with volcanic processes--with abiogenous synthesis taking place in ash-gas clouds and, possibly, in the entrails of the Earth (hydrocarbons and their heteroatomic derivatives have also been found in volcanic bombs).
(6) The results obtained are discussed in relation to abiogenic synthesis of biologically important compounds in prebiological evolution and to possible development of metabolic pathways which are found in contemporary organisms.
(7) Porphin, chlorin and bacteriochlorin were formed by abiogenic synthesis.
(8) The data obtained show that in pre-biologic conditions in the hydrosphere of Earth (possibly, of other planets as well), abiogenically formed organic substances, e. g. carbohydrates, unter the influence of UV irradiation could be transformed into amino acids.
(9) The data obtained reveal a possibility of incorporating the organic acids into polypeptide chains during abiogenic synthesis of biologically active substances.
(10) With respect to the fluorescence spectra free bases of the compounds were close to the pigments that formed in abiogenic synthesis experiments (predominance of long-wave length fluorescence band).
(11) The present work pertains to the study of the influence of nickel, cobalt, thorium, vanadium, molybdate, ferrous ions on the formation of cysteine which is synthesized abiogenically together with other amino acids in sterilized aqueous mixtures of ammonium thiocyanate, formaldehyde, potassium dihydrogen phosphate, calcium acetate, and biological minerals after irradiating by artificial light.
(12) We studied as photoreceptors inorganic components of Earth crust, some coenzymes and porphyrins of abiogenic and biogenic origin.
(13) The results obtained indicate that during abiogenic period, synthesis of peptides and peptide-like substances from dry mixtures of amino acids and organic acids induced by UV-irradiation and heat might take place on the litosphere.
(14) The pigments detected occurred in the ash as molecular complexes with amino acids which seem to be a abiogenic origin.
(15) Abiogenic synthesis takes place more readily in the presence of O2 than in a N2 atmosphere.
(16) The present work deals with the processes involved in the abiogenic polycondensation of nucleotides adsorbed on the clay mineral kaolinite under the action of ultraviolet (UV) radiation.
(17) The previously proposed theory of biogenesis being a multi-hit process (due to random assemblage, within an aggregate of abiogenic nucleic acids (NAs) and proteins, of a set of functional molecules necessary for primitive life) is developed further taking into account speed of reactions and reproduction of protobionts, random distribution of functional molecules in protocell fission, and speed of earliest evolution.
Spontaneous
Definition:
(a.) Proceding from natural feeling, temperament, or disposition, or from a native internal proneness, readiness, or tendency, without constraint; as, a spontaneous gift or proportion.
(a.) Proceeding from, or acting by, internal impulse, energy, or natural law, without external force; as, spontaneous motion; spontaneous growth.
(a.) Produced without being planted, or without human labor; as, a spontaneous growth of wood.
Example Sentences:
(1) Spectral analysis of spontaneous heart rate fluctuations, a powerful noninvasive tool for quantifying autonomic nervous system activity, was assessed in Xenopus Laevis, intact or spinalized, at different temperatures and by use of pharmacological tools.
(2) Hypothyroidism complicated by spontaneous hyperthyroidism is an interesting but rare occurrence in the spectrum of autoimmune thyroid disorders.
(3) Spontaneous locomotor activity was lower in naloxone-infused rats on day 3 only.
(4) administration of the potent short-acting opioid, fentanyl, elicited inhibition of rhythmic spontaneous reflex increases in vesical pressure (VP) evoked by urinary bladder distension.
(5) Sample processing appears effective in avoiding spontaneous oxalogenesis.
(6) Thus, B cells that grow spontaneously from the peripheral blood of SS patients spontaneously produce a B-cell growth factor.
(7) They can rarely be detected spontaneously but most often are provoked.
(8) The ACTH deficiency recovered spontaneously, with normal cortisol responses to depot Synacthen (greater than 1380 at 6 h) and hypoglycemia (peak, 590) 14 and 18 months postpartum, respectively.
(9) The number of peripheral blood lymphocytes (PBL) producing IgM (spontaneous and pokeweed mitogen (PWM) stimulated) at the end of a seven day culture period was similar in PBC patients and control subjects while the amount of IgM synthesized (spontaneous and PWM stimulated) during this period was significantly greater in the patient group, implying that the amount of IgM produced per B cell was increased in PBC.
(10) In in vitro preparations GABA (10(-7) - 10(-3) M) elicited a dose-dependent relaxation; a decrease in the spontaneous contractions was sometimes observed.
(11) Fractures which occur near the base of the dens have a low propensity to unite spontaneously.
(12) The cell fermentation culture with a stabilized pH value was better than the culture with the pH value changing spontaneously on saponin content, growth rate and biomass.
(13) Recovery was spontaneous and no antimicrobial agents were required.
(14) Over a period of 9 months a 12-year-old girl spontaneously developed a palpable cystic tumor in the upper eye lid which led to an indentation and downward displacement of the globe.
(15) In the dark the 6-azidoflavoproteins are quite stable, except for L-lactate oxidase, where spontaneous conversion to the 6-amino-FMN enzyme occurs slowly at pH 7.
(16) Spontaneous reports of suspected adverse reactions may be the only way of revealing very rare events but they present great difficulties of rational interpretation.
(17) In addition, spontaneous platelet aggregation is increased when vegetations are present on cardiac valves.
(18) Media made hyperosmotic with sucrose increase the frequency of spontaneously released quanta of transmitter, or miniature excitatory postsynaptic potentials (MEPSPs).
(19) There is no convincing evidence that immunosuppression is effective, also because the natural history of the disease is characterised by a spontaneous disappearance of the factor VIII-C inhibitor.
(20) By contrast, the concentrations of IgA1 kappa and IgA1 lambda in PBMC culture supernatants, both spontaneous and PWM-stimulated, were identical in patients and controls.