Unscramble pyrocatechol, Unscramble letters pyrocatechol, Point value for pyrocatechol, Word Decoder for pyrocatechol, Word generator using the letters pyrocatechol, Word Solver pyrocatechol, Possible Scrabble words with pyrocatechol, Anagram of pyrocatechol
TY - JOUR. T1 - Optimal conjugation of catechol group onto hyaluronic acid in coronary stent substrate coating for the prevention of restenosis. AU - Lih, Eugene. AU - Choi, Seul Gi. AU - Ahn, Dong June. AU - Joung, Yoon Ki. AU - Han, Dong Keun. PY - 2016/2/13. Y1 - 2016/2/13. N2 - Although endovascular stenting has been used as an interventional therapy to treat cardio- and cerebro-vascular diseases, it is associated with recurrent vascular diseases following stent thrombosis and in-stent restenosis. In this study, a metallic stent was coated with dopamine-conjugated hyaluronic acid with different ratios of catechol group to improve hemocompatibility and re-endothelialization. Especially, we were interested in how much amount of catechol group is appropriate for the above-mentioned purposes. Therefore, a series of dopamine-conjugated hyaluronic acid conjugates with different ratios of catechol group were synthesized via a carbodiimide coupling reaction. Dopamine-conjugated hyaluronic acid ...
The complex interactions of oxidizable organic ligands with soil Mn(III,IV) (hydr)oxide minerals have received little study by in situspectroscopic techniques.We used a combination of an in situ electron paramagnetic resonance stopped-flow (EPR-SF) spectroscopic technique and stirred-batch studies to measure the reductive dissolution kinetics of birnessite (δ-MnO2), a common Mn mineral in soils, by catechol (1,2-dihydroxybenzene). The reaction was rapid, independent of pH, and essentially complete within seconds under conditions of excess catechol at pH 4 to 6. The overall empirical second-order rate equation describing the reductive dissolution rate was d[Mn(II)]/dt = k[CAT]1.0[SA]1.0 where k = 4 (±0.5) (10-3 L m-2 s-1 and [CAT] and [SA] are the initial concentrations in molarity and meters square per liter. In the process, catechol was oxidized to the two-electron o-quinone product. The energy of activation (Ea) for the reaction was 59 (±7) kJ mol-1 and the activation entropy (S‡) was- -78±22 J
para-Nitrophenol (PNP) is a highly toxic compound with threats to mammalian health. The pnpE-encoded γ-hydroxymuconic semialdehyde dehydrogenase catalyzes the reduction of γ-hydroxymuconic semialdehyde to maleylacetate in Pseudomonas sp. strain WBC-3, playing a key role in the catabolism of PNP to Krebs cycle intermediates. However, the catalyzing mechanism by PnpE has not been well understood. Here we report the crystal structures of the apo and NAD bound PnpE. In the PnpE-NAD complex structure, NAD is situated in a cleft of PnpE. The cofactor binding site is composed of two pockets. The adenosine and the first ribose group of NAD bind in one pocket and the nicotinamide ring in the other. Six amino acids have interactions with the cofactor. They are C281, E247, Q210, W148, I146 and K172. Highly conserved residues C281 and E247 were identified to be critical for its catalytic activity. In addition, flexible docking studies of the enzyme-substrate system were performed to predict the interactions
Spectrophotometric determination of tin in copper-based alloys using Pyrocatechol Violet Spinola Costa, A.; Teixeira, L. S. G.; Ferreira, S. L. C. ...
To address the decontamination of (1) toxic organic compounds such as naphthene and catechol found in the tailings ponds, natural pathways that can break down the toxic chemicals can be utilized. The toxic organic compounds can be broken down into molecules that are metabolizable by all organisms, such as 2-hydroxymuconic semialdehyde (2-HMS)3. Catechol is a prime candidate to function as a hub for the funneling and subsequent degradation of other toxic compounds found in abundance, such as naphthene, anthracene, and fluorene into 2-HMS (Figure 1)3,4,5. Catechol 2,3-dioxygenase (xylE) is found in Pseudomonas putida and hydrolyzes catechol into 2-HMS, which can enter the citric acid cycle6. In 2010, the Lethbridge iGEM team confirmed that xylE when introduce to E. coli hydrolyzes catechol to 2-HMS demonstrating and that this critical step can successfully be performed to convert toxic chemicals to metabolic intermediates7. XylE is inefficient on its own, especially in vitro, due to instability ...
1. The ring-fission of cis- and trans-acenaphthene-1,2-diol by rat liver microsomes was studied. 2. 1,8-Naphthalic acid was detected and isolated after microsomal incubations of the diols. 3. The accompanying reduction of NAD+ was followed spectrophotometrically. 4. The optimum pH for the microsomal reaction was 9·4 for the oxidation of the cis-diol and 9·8 for that of the trans-diol. 5. p-Chloromercuribenzoate and 2,4-dichlorophenol inhibited the reaction. 6. Possible mechanisms for the microsomal ring-fission, involving 1,8-naphthalic aldehyde, are discussed.. ...
In order to determine which enzymes would most benefit from metabolic channeling in the catechol degradation pathway, we used a cellular simulation tool, developed in our lab, called Cell++. It allows us to place enzymes of choice in a compartment within a cellular environment and calculates the effect of localization on metabolite concentrations in a user-defined biochemical pathway (Sanford et al. 2006). We gathered kinetic data of the five enzymes in the degradation pathway and investigated the effects of localizing pairs of sequential enzymes (i.e. catechol 1, 2-dioxygenase and muconate cycloisomeras) on metabolite concentrations. Four co-localization simulations were performed in Cell++ along with a control simulation where no enzymes were co-localized. The initial metabolite in the simulation environment, catechol, was added into the simulation environment and the simulation environment was run for 10,000 iterations to observe the effect on catechol degradation in each simulation. The ...
This section needs work. Why are we degrading catechol? What part did we use? What is the number?. Catechol is another toxic compound found in tailings ponds that is a by-product of polyaromatic hydrocarbon metabolism (Vaillancourt et al., 2006, Schweigert et al., 2001)). The chemical properties of catechol allow it to react with biomolecules like DNA, proteins and membranes (Schweigert et al., 2001). These interactions can cause serious damage including DNA breakage, enzyme inactivation and membrane uncoupling (Schweigert et al., 2001). Catechol is characterized as having a benzene ring with two hydroxyl groups emanating from adjacent carbons. It can be converted to 2-hydroxymuconic acid by the enzyme catechol 2,3-dioxygenase, encoded by the xylE gene on the Tol plasmid of Pseudomonas putida (Nakai et al., 1983). This product can then be further metabolized to pyruvate and acetaldehyde; products which can then be routed into the fatty acid biosynthesis pathway and converted to alkanes with the ...
The gene cluster, coding for the chlorocatechol sp. of hereditary, biochemical, and ecological areas of the connections of several chloroaromatic substances with microorganisms in the biosphere within a broad work to comprehend the fate of the chemicals in the surroundings also to develop book bioremediation strategies (22, 33, 37). Among the principles to emerge out of this body of function is the department of biodegradative routes into higher and lower pathways that are linked with the central intermediate chlorocatechol (38). Hereditary research of chlorocatechol sp. stress P51 and sp. stress PS12: an entire mineralization pathway seems to have advanced through transposon-mediated recruitment of toluene or benzene dioxygenase and dihydrodiol dehydrogenase genes following to a gene cluster coding for an gene cluster, hereafter known as the gene cluster) in the trichlorobenzene-degrading stress sp. stress P51 (41) within a Tnchlorocatechol catabolic genes are organized within an operon and ...
After verifying that we could in fact degrade catechol into 2-hydroxymuconate semialdehyde using our xylE construct (BBa_J33204), we wondered if we could take this any further. What if we could convert this by-product page into hydrocarbons too? As catechol is the breakdown product of a number of different degradation pathways in bacteria, this could be particularly useful.. As 2-hydroxymuconate semialdehyde can be further metabolized to pyruvate and acetaldehyde (Harayama S et al., 1987), it seemed possible that these products could be routed into the fatty acid biosynthesis pathway and converted to alkanes using the PetroBrick or the OleT enzyme. Given that the Catechol 2,3-dioxygenase reaction is extracellular, it creates a possible scenario in which cells with the xylE construct could be co-cultured with Petrobrick-containing cells to cooperatively metabolise catechol into hydrocarbons. In order to test this, we followed this protocol, where we co-cultured cells expressing our xylE construct ...
Read "In situ surface modification of colloidal TiO2 nanoparticles with catechol, Research on Chemical Intermediates" on DeepDyve, the largest online rental service for scholarly research with thousands of academic publications available at your fingertips.
Learn about Comtan (Entacapone) may treat, uses, dosage, side effects, drug interactions, warnings, patient labeling, reviews, and related medications.
In order to identify enzymes in the catechol degradation pathway (ortho cleavage) that benefit from the introduction of metabolic channelling, we performed in silico analyses with software developed in our lab (Sanford et al.). Preliminary results from our simulations suggests that the 3rd (muconolactone D-isomerase) and 4th (3-oxodipate-enol lactone hydrolase) enzymes in the pathway would benefit most from channelling (Figure 2). Muconolactone D-isomerase catalyzes an energetically unfavourable reaction, while 3-oxodipate-enol lactone hydrolase catalyzes a very energetically favourable reaction. By introducing channeling between these two enzymes, the energetically unfavourable product of the mucanolactone D-isomerase-catalyzed reaction would be converted to the product of 3-oxodipate-enol lactone hydrolase before mucanolactone D-isomerase converts the energetically unfavourable product back into the energetically favourable substrate. The net effect would be an increased flux through the ...
Looking for TCI AMERICAS 4-Nitrocatechol,5g (20EM61)? Graingers got your back. Price:$92.00. Easy ordering & convenient delivery. Log-in or register for your pricing.
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Solubility in water: 430g/L (20°C). Other solubilities: soluble in alcohol, benzene, chloroform, ether, and pyridine and aqueous solutions ...
Affiliation:Professor,Shiga University of Medical Science,医学部,教授, Research Field:General medical chemistry, Keywords:カテコ-ル2,3ー二原子酸素添加酵素,酸素添加酵素,日中間学術交流,Oxygenase,Catechol 2, 3-dioxygenase,生体代謝調節,2, 3-dioxygenase,3, 5-dichlorocatechol,アミノ酸配列,Charge transfer complex, # of Research Projects:5, # of Research Products:0
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TY - JOUR. T1 - L-DOPA biotransformation. T2 - Correlations of dosage, erythrocyte catechol O-methyltransferase and platelet SULT1A3 activities with metabolic pathways in Parkinsonian patients. AU - Dousa, M. K.. AU - Weinshilboum, Richard M. AU - Muenter, M. D.. AU - Offord, K. P.. AU - Decker, P. A.. AU - Tyce, G. M.. PY - 2003/8/1. Y1 - 2003/8/1. N2 - The objectives of this study were to determine (1) the effects of dose and drug absorption on pathways of biotransformation of L-DOPA in Parkinsonian patients treated with Sinemet, and (2) the extent to which genetically-determined variations in the activities of erythrocyte catechol O-methyltransferase and/or platelet phenol sulfotransferase might be reflected in individual differences in L-DOPA metabolism. In the 19 patients studied, there were negative correlations between dosage or absorption and extent of O-methylation and of sulfation of L-DOPA or its metabolites. Levels of activity for erythrocyte COMT were also reflected in individual ...
Catechols are known to coordinate divalent metal ions by virtue of their acidic ortho-hydroxyl groups. A recent HTS screening campaign to develop inhibitors against Pfm18AAP, a potential drug target for the treatment of malaria, identified a number of catechol-containing inhibitory molecules (Schoenen et al., 2010). In fact, the best-in-class probe identified in that screen, ML369 (Supplemental Fig. 5A), features a catechol moiety linked to a piperidine-tetrahydroquinoline ring system. Catechols have also been identified as inhibitors of methionine aminopeptidase, which, like DNPEP, also contains a binuclear zinc center. A structure of E. coli methionine aminopeptidase in complex with a catechol-containing compound revealed the mode of interaction of the catechol ring with the binuclear zinc center (Wang et al., 2008). In this structure, one of the hydroxyl groups of the catechol replaced water as a bridging ligand, whereas the other interacted with one of the zinc ions enforced by the active ...
Looking for online definition of catechol in the Medical Dictionary? catechol explanation free. What is catechol? Meaning of catechol medical term. What does catechol mean?
Natural catechol, quinone and quinone methide diterpenes with abietane (15-deoxyfuerstione, taxodione) and totarane (dispermone, 12,13-dihydroxy-8,11,13-totaratriene-6-one), and podocarpane (nimbidiol, deoxynimbidiol) skeletons were synthesized using ortho-oxidation of phenol with meta-chlorobenzoyl peroxide. Minimum inhibitory activities of these diterpenes and previously synthesized natural diterpenes were measured against methicillin-resistant Staphylococcus aureus (MRSA) and Propionibacterium acnes, which cause serious skin infection associated with acne. Abietaquinone methide and 8,11,13-totaratriene-12,13-diol showed potent activities against S. aureus (MRSA) and P. acnes, and no serious toxicity by oral dose to mice.
Accepted name: catechol 2,3-dioxygenase. Reaction: catechol + O2 = 2-hydroxymuconate-6-semialdehyde. For diagram of reaction click here.. Glossary: 2-hydroxymuconate-6-semialdehyde = (2Z,4E)-2-hydroxy-6-oxohexa-2,4-dienoate. Other name(s): 2,3-pyrocatechase; catechol 2,3-oxygenase; catechol oxygenase; metapyrocatechase; pyrocatechol 2,3-dioxygenase; xylE (gene name). Systematic name: catechol:oxygen 2,3-oxidoreductase (decyclizing). Comments: Requires FeII. The enzyme initiates the meta-cleavage pathway of catechol degradation.. Links to other databases: BRENDA, EXPASY, KEGG, Metacyc, PDB, UM-BBD, CAS registry number: 9029-46-3. References:. 1. Hayaishi, O. Direct oxygenation by O2, oxygenases. In: Boyer, P.D., Lardy, H. and Myrbäck, K. (Eds), The Enzymes, 2nd edn, vol. 8, Academic Press, New York, 1963, pp. 353-371.. 2. Kojima, Y., Itada, N. and Hayaishi, O. Metapyrocatechase: a new catechol-cleaving enzyme. J. Biol. Chem. 236 (1961) 2223-2228. [PMID: 13757654]. 3. Nozaki, M., Kagamiyama, H. ...
An activated carbon, CarbochemTM-PS230, was modified by chemical and thermal treatment in flow of H2, in order to evaluate the influence of the activated carbon chemical characteristics in the adsorption of the catechol. The catechol adsorption in aqueous solution was studied along with the effect of the pH solution in the adsorption process of modified activated carbons and the variation of immersion enthalpy of activated carbons in the aqueous solutions of catechol. The interaction solid-solution is characterized by adsorption isotherms analysis, at 298 K and pH 7, 9 and 11 in order to evaluate the adsorption value above and below that of the catechol pKa. The adsorption capacity of carbons increases when the solution pH decreases. The retained amount increases slightly in the reduced carbon to maximum adsorption pH and diminishes in the oxidized carbon. Similar conclusions are obtained from the immersion enthalpies, whose values increase with the solute quantity retained. In granular activated carbon
That said, it might. We did a little research…. Ginger Phytochemistry:. The chemical constituents of ginger (and ginger supplements) have been known for some years [2][3]. 6-shogaol is one of the 4 main pungent constituents of ginger [4] (the others are 6-gingerol, 8-gingerol and 10-gingerol. Shogaols are chemically similar to gingerols - being the dehydrated form thereof. Interestingly, Shogaols are found in only small quantities in the fresh root and are mainly found in the dried and thermally treated roots; with 6-shogaol becoming the most abundant of these constituents when ginger is dried or cooked. [5] There are smaller amounts of other gingerols, shogaols and many further compounds in ginger; these are largely untested but may contribute significantly to the health benefits of the whole root.. Bioavailability Of 6-Shogaol:. As it happens, a 2010 study has investigated the bioavailability of 6-shogaol. [4] Their notes reported first of all that prior to that study, few studies had ...
Abstract. The sinks of hydrocarbons in the atmosphere are usually described by oxidation reactions in the gas and aqueous (cloud) phases. Previous lab studies suggest that in addition to chemical processes, biodegradation by bacteria might also contribute to the loss of organics in clouds; however, due to the lack of comprehensive data sets on such biodegradation processes, they are not commonly included in atmospheric models. In the current study, we measured the biodegradation rates of phenol and catechol, which are known pollutants, by one of the most active strains selected during our previous screening in clouds (Rhodococcus enclensis). For catechol, biodegradation transformation is about ten times faster than for phenol. The experimentally derived biodegradation rates are included in a multiphase box model to compare the chemical loss rates of phenol and catechol in both the gas and aqueous phases to their biodegradation rate in the aqueous phase under atmospheric conditions. Model results ...
ortho-Quinones are produced in vivo through the oxidation of catecholic substrates by enzymes such as tyrosinase or by transition metal ions. Neuromelanin, a dark pigment present in the substantia nigra and locus coeruleus of the brain, is produced from dopamine (DA) and norepinephrine (NE) via an interaction with cysteine, but it also incorporates their alcoholic and acidic metabolites. In this study we examined the metabolic fate of ortho-quinones derived from the catecholamine metabolites, 3,4-dihydroxyphenylethanol (DOPE), 3,4-dihydroxyphenylethylene glycol (DOPEG), 3,4-dihydroxyphenylacetic acid (DOPAC) and 3,4-dihydroxyphenylmandelic acid (DOMA). The oxidation of catecholic substrates by mushroom tyrosinase was followed by UV-visible spectrophotometry. HPLC analysis after reduction with NaBH4 or ascorbic acid enabled measurement of the half-lives of ortho-quinones and the identification of their reaction products. Spectrophotometric examination showed that the ortho-quinones initially formed
화장품 산업은 인류의 오랜 꿈 가운데 하나인 미(美)에 대한 욕망을 바탕으로 지금까지 꾸준히 발전해 왔다. 특히 21세기에 들어서 고령인구의 증가로 인한 소비자층의 확대와 환경, 화장품 원료의 안전성에 대한 관심 급증으로 인해 현재 노화예방 효능이 우수하면서도 안전한 천연 유래 화장품 원료 개발이 시급한 실정이다.. 6-Shogaol은 생강(Zingiber officinale)의 매운맛을 내게 해주는 주성분 중 하나로 신선한 생강에 가장 많이 들어있는 gingerols의 가수분해산물이다. 최근 6-shogaol이 gingerol보다 항염증, 항산화, 항암 효과가 더 뛰어나다는 연구보고가 잇따르고 있으나 이와 관련한 대부분의 연구는 식품이나 의·약학, 생명과학 분야에 국한되어 있다. 현재 향장 분야에서의 6-shogaol에 대한 연구는 극히 미미하며, 특히 인간진피섬유아세포에서의 6-shogaol에 대한 ...
Patients should be instructed to take entacapone tablets only as prescribed. Patients should be informed that hallucinations can occur. Patients should be advised that they may develop postural (orthostatic) hypotension with or without symptoms such as dizziness, nausea, syncope, and sweating. Hypotension may occur more frequently during initial therapy. Accordingly, patients should be cautioned against rising rapidly after sitting or lying down, especially if they have been doing so for prolonged periods, and especially at the initiation of treatment with entacapone tablets. Patients should be advised that they should neither drive a car nor operate other complex machinery until they have gained sufficient experience on entacapone tablets to gauge whether or not it affects their mental and/or motor performance adversely. Because of the possible additive sedative effects, caution should be used when patients are taking other CNS depressants in combination with entacapone tablets. Patients should ...
Entacapone is a catechol -o methyl trasnferase inhibitor. Entacapone is useful as an adjunct in patient currently on carbidopa and levodopa therapy. Entacapone will synergies the levodopa and carbidopa anti parkinsonian effects.
Surface-enhanced Raman spectroscopy (SERS) and partial least squares (PLS) regression have been applied for the quantification of entacapone isomers ,i,E,/i, and ,i,Z,/i, in solution. Nine mixtures of isomers ,i,Z,/i, and ,i,E,/i, in ethanol ranging from 0% to 100% w/w were analyzed, for a total entacapone concentration of 1 × 10,sup,−3,/sup, mol L,sup,−1,/sup,. Upon deposition onto commercially available Klarite,b,®,/b, gold plates, highly intense and reproducible SERS spectra were obtained from the entacapone isomers. Based on the spectral measurements, a two-component PLS model for correlation of predicted and real content of the isomers mixtures was developed. Root-mean-square error of the predicted composition was found to be 8% of isomer ,i,Z,/i, in the isomers mixture, corresponding to the absolute concentration of 8 × 10,sup,−5,/sup, mol L,sup,−1,/sup, of isomer ,i,Z,/i, in solution.. PDF Article ...
The possible cancer-preventive activity of ginger is receiving a great deal of attention. Information on the metabolism of ginger components such as [6]-shogaol is important for understanding the biological effects of ginger. The mouse and cancer cells are frequently used as experimental models to study the cancer-preventive effects of ginger and its bioactive components. Our results indicate that [6]-shogaol is extensively metabolized in mice and in cancer cells. In the present study, 13 metabolites were identified, with 12 in mice and 4 in cancer cells (Fig. 1).. Reduction of xenobiotic carbonyls is a significant metabolic route to produce more hydrophilic and often less toxic compounds, which can be substrates for phase II conjugation by UDP-glucuronosyltransferases or sulfotransferases, leading ultimately to excretion of the products (Oppermann, 2007). In this investigation, reduced metabolites were formed in which M11 is the double-bond-reduced metabolite of [6]-shogaol, and M9 and M6 are ...
The present invention relates to 4-pyridinone compound as catechol -O- methyltransferase (COMT) inhibitors and are useful in the treatment or prevention of COMT enzyme is involved in neurological and psychiatric disorders and diseases. The present invention also relates to the use of these compounds comprises pharmaceutical compositions of these compounds and compositions in the prevention or disease involving COMT treatment.
This work demonstrates the ring-cleavage pathways of catechol on Pseudomonas cepacia ATCC 29351, formed upon its growth on salicylate and benzoate, each as a sole carbon source. When grown on salicyla
A catechol signal recorded with in vivo voltammetry within the rat rostral ventrolateral medulla (RVLM) was taken as an index of the activity of RVLM adrenergic neurons and related to the level of arterial PCO2, under halothane anesthesia. Reversible
The stability of the complex formed by one molecule of 1,2-dihydroxybenzene and one molecule of zinc acetate in solutions with different permittivity and temperature was investigated by means of spectroscopic and chromatographic methods. The Becke hybrid three-parameter nonlocal exchange functional combined with the Lee-Yang-Parr dynamic correlation functional method (B3LYP/6-31G(d)) and the isodensity polarized continuum model (IPCM) were used in the calculations. It was assumed that the formation of the complex takes place by a reaction between ions of opposite charges. It was also proposed an equation to explain the changes of the constant of the complexation equilibrium with the permittivity of the reaction medium. The calculations allowed us to prove that the increase of the hydrogen-bond donor ability of the solvents favours a higher thermodynamic stability of the reactants with respect to the complex and, as a result, a decrease of the corresponding equilibrium constants. The non-planar ...
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When (6)-shogaol (0.5 mg/kg, i.v.) was administered to rats, blood pressure showed a tri-phasic response which was comprised of a rapid fall, followed by a rise and a delayed fall. The rapid fall, which followed immediately after injection of (6)-shogaol, disappeared with the use of atropine and vag …
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Burkholderia sp. RP007 aromatic 1,2-dioxygenase beta subunit (phnY),chloroplast-type ferredoxin (phnT2), catechol 2,3-dioxygenase (phnE2), and(phnX) genes, complete cds; and 2-hydroxymuconic semialdehyde dehydrogenase(phnG2) gene, partial ...
The inhibition of soluble catechol-O-methyltransferase (S-COMT) in red blood cells (RBCs) by entacapone, and the pharmacokinetics of entacapone after singl
The Golm Metabolome Database (GMD) facilitates the search for and dissemination of mass spectra from biologically active metabolites quantified using GC-MS.
The Golm Metabolome Database (GMD) facilitates the search for and dissemination of mass spectra from biologically active metabolites quantified using GC-MS.
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Catecholamines and their metabolites have been separated isocratically by reverse-phase chromatography with aqueous (no organic solvent admixed) eluents. Unlike ion-exchange or ion-pair chromatography, mixtures of both acidic and basic substances can be separated in a single chromatographic run, because the retention is governed by hydrophobic interactions between the nonpolar moiety of the solute molecules and the octadecyl-silica stationary phase. The relative retention values strongly depend on the pH of the eluent, which governs the degree of dissociation of ionogenic solutes. The reproducibility of the results and the stability and efficiency of the chromatographic systems make this approach particularly attractive for use in clinical analysis.. ...
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