What's the difference between hypothetical and methenyl?
Hypothetical
Definition:
(a.) Characterized by, or of the nature of, an hypothesis; conditional; assumed without proof, for the purpose of reasoning and deducing proof, or of accounting for some fact or phenomenon.
Example Sentences:
(1) The pathomechanism, how C. pylori facilitates the development of peptic ulcer is since hypothetical.
(2) The model is based on the concept that a cell with hypothetically unlimited replicative potential--i.e.
(3) Blight responded with a hypothetical, telling Ludlam if the ASD asked a foreign agency to get material about Australian citizens it could not access under Australian law, the IGIS would know about it and flag it in its annual report.
(4) The possible roles of the sorbitol pathway and of hypothetical regulatory sites for the glucose molecule ("receptors") are briefly discussed.
(5) By analysis of the three sequences we were able to delineate a hypothetic model for region X domain evolution and discussed the origin of genetic variability within and without strains.
(6) For now, it is a hypothetical danger and England cannot be doing too badly if the worst controversy about Hodgson's squad is who goes as reserve left-back.
(7) On the basis of these data, a hypothetical molecular mechanism of vestibular efferent modulation of the primary afferent pathway is proposed.
(8) A hypothetical scheme is presented that pursues the processes involved in invasion from the biochemical events generated by attachment of the parasite, to the steric rearrangement of red cell membrane proteins, which culminates in invasion.
(9) Samples taken by Monte Carlo means from a hypothetical in vitro population were compared with clonal survival data obtained experimentally.
(10) A hypothetical model is proposed in which prevention of ulcer formation or accelerated healing of ulcers by conventional therapies may be FGF dependent.
(11) In Experiment 1, subjects exposed to a sound representing their heartbeat made greater self-attributions for hypothetical outcomes than did subjects exposed to the same sound identified as an extraneous noise.
(12) The hypothetical pattern is regenerative and shows how epithelial cell patterns where cells divide might arise.
(13) First-year student nurses attributed less pain to the hypothetical patient than third- and fourth-year student nurses and registered nurses.
(14) Problems which have arisen and considerations on the hypothetic future interventions are considered.
(15) The authors surveyed primary care physicians in Missouri to determine the presence and extent of standards of care for 12 hypothetical cases.
(16) A hypothetical view of the relationship between these cell types is presented.
(17) In assessing the autoradiographs, two methods were compared, the circle analysis and the recently described hypothetical grain analysis.
(18) Hypothetically a blockade of the surface of T-lymphocytes by products of the immediate reaction, for example immune complexes, is suggested.
(19) The loss of threshold showed a large inter-individual variability, with a rapid increase above a hypothetic threshold dose.
(20) From the data obtained a hypothetical sequence of phosphorylation and 18O-exchange reactions in myofibril action has been suggested.
Methenyl
Definition:
(n.) The hypothetical hydrocarbon radical CH, regarded as an essential residue of certain organic compounds.
Example Sentences:
(1) The enzyme catalyzes the hydrolysis of methenyl-H4MPT to formyltetrahydromethanopterin (formyl-H4MPT).
(2) A DNA clone complementary to the messenger RNA encoding the human trifunctional enzyme 5,10-methylenetetrahydrofolate dehydrogenase-5,10-methenyl-tetrahydrofolate cyclohydrolase-10-formyltetrahydrofolate synthetase has been isolated from a lambda gt10 library.
(3) The relative configuration of the pterin moiety of 5,6,7,8-tetrahydromethanopterin 1, a coenzyme isolated from methanogenic archaea, has been determined by two-dimensional NMR spectroscopy of N5,N10-methenyl-5,6,7,8-tetrahydromethanopterin 2 to be rel-(6R; 7S; 11R).
(4) We also measured the activities of another three enzymes of the folic acid cycle, viz., 5,10-methylene-H4folate dehydrogenase, 10-formyl-H4folate synthetase, and 5,10-methenyl-H4folate cyclohydrolase, as well as the enzyme cystathionine beta-synthase.
(5) Evaluation of the reaction equilibrium indicated that the methenyl derivative was favored over 5-formyltetrahydromethanopterin, with a much higher equilibrium constant than for the analogous reaction of tetrahydrofolate derivatives.
(6) Escherichia coli DNA photolyase contains 1,5-dihydro-FAD (FADH2) plus 5,10-methenyl-tetrahydrofolate (5,10-CH+-H4folate).
(7) IR spectrophotometry of the crystals embedded in potassium bromide disc showed specific spectra in the 1400-800 cm-1 wave number range and typical peaks on wave number assigned for hydroxy or amine (3420 cm-1), aromatic hydrogen (3060 cm-1), methyl, methylenic, or methenyl (2960-2860 cm-1), and carbonyl (1715 cm-1) groups can be demonstrated.
(8) The three activities are thus shown to reside in a protein composed of two apparently identical subunits, and the trivial name formyl-methenyl-methylenetetrahydrofolate synthetase(combined) is proposed for this enzyme to suggest the multiple catalytic activities associated with the single protein species.
(9) A method has been devised for the cytochemical demonstration of 5-formyl tetrahydrofolate cyclodehydrase and 5,10-methenyl tetrahydrofolate cyclohydrolase activity which uses 5-formyl tetrahydrofolate or 5,10-methenyl tetrahydrofolate as substrate respectively, blocking possible interferences by other enzymes, and allows the nonenzymatic reduction of nitro-blue tetrazolium by 5,10-methenyl tetrahydrofolate formed by the action of the cyclodehydrase on the substrate 5-formyl tetrahydrofolate, and by 10-formyl tetrahydrofolate formed by the action of cyclohydrolase on the substrate 5,10-methenyl tetrahydrofolate, thus revealing intracellular sites of enzyme activity.
(10) In eucaryotes, 10-formyltetrahydrofolate (formyl-THF) synthetase, 5,10-methenyl-THF cyclohydrolase, and NADP(+)-dependent 5,10-methylene-THF dehydrogenase activities are present on a single polypeptide termed C1-THF synthase.
(11) A second enzyme, cyclohydrolase, converts 5,10-methenyl tetrahydrofolate to 10-formyl tetrahydrofolate.
(12) 5,10[14C]methylene H4folate and 5,10[14C]methenyl H4folate also serve as precursors of formic acid in the poison gland, suggesting that they are intermediates in the pathway.
(13) C1-tetrahydrofolate (THF) synthase is a trifunctional protein possessing the activities 10-formyl-THF synthetase, 5,10-methenyl-THF cyclohydrolase, and 5,10-methylene-THF dehydrogenase.
(14) The product of formyl transfer by the purified enzyme was shown by a number of criteria to be 5-formyl-H4MPT, as opposed to 10-formyl-H4MPT or 5,10-methenyl-H4MPT.
(15) When methanogenesis from the non-physiological donors was followed under a nitrogen atmosphere, the C1 moiety from each compound underwent a disproportionation, forming methenyl-H4MPT+ and methane.
(16) The enzyme 5-formyl tetrahydrofolate cyclodehydrase plays an important role in the conversion of 5-formyl tetrahydrofolate to 5,10-methenyl tetrahydrofolate.
(17) Similarly, the nonenzymatic hydrolysis of methenyl-H4MPT is highly dependent on pH and buffer.
(18) Cell extracts of Methanobacterium thermoautotrophicum possess a methenyl-tetrahydromethanopterin (methenyl-H4MPT) cyclohydrolase.
(19) In eukaryotes, this enzyme is trifunctional and contains the activities of 10-formyl-H4folate synthetase, 5,10-methenyl-H4folate cyclohydrolase, and 5,10-methylene-H4folate dehydrogenase.
(20) The compounds tested served as substrates for the enzymatic synthesis of methenyl-H4MPT+.