Bibliographies thématiques / Glycosyl hydroxylamines

Littérature scientifique sur le sujet « Glycosyl hydroxylamines »

Auteur : Grafiati
Publié le 10 mars 2023

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Articles de revues sur le sujet "Glycosyl hydroxylamines"

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Merino, P., S. Franco, F. L. Merchan et T. Tejero. « A Facile Synthesis of Glycosyl Hydroxylamines ». Synthetic Communications 27, no 20 (1 octobre 1997) : 3529–37. http://dx.doi.org/10.1080/00397919708007074.

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MERINO, P., S. FRANCO, F. L. MERCHAN et T. TEJERO. « ChemInform Abstract : A Facile Synthesis of Glycosyl Hydroxylamines ». ChemInform 29, no 1 (24 juin 2010) : no. http://dx.doi.org/10.1002/chin.199801229.

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Nimpaiboon, Adun, Sureerut Amnuaypornsri et Jitladda T. Sakdapipanich. « OBSTRUCTION OF STORAGE HARDENING IN NR BY USING POLAR CHEMICALS ». Rubber Chemistry and Technology 89, no 2 (1 juin 2016) : 358–68. http://dx.doi.org/10.5254/rct.16.84825.

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ABSTRACT The effect of the polar chemicals phenol, diethylene glycol, and hydroxylamine hydrochloride on obstruction of storage hardening in NR was examined. A decrease in gel content and molecular weight of NR was observed after addition of diethylene glycol and hydroxylamine hydrochloride, whereas no significant change was observed after addition of phenol. The storage hardening behavior of NR containing these polar chemicals was investigated by accelerated storage with phosphorus pentoxide. The gel content, Mooney viscosity, and Wallace plasticity values of NR containing phenol increased obviously during accelerated storage hardening, whereas these values increased gradually in the presence of diethylene glycol and were constant in the presence of hydroxylamine hydrochloride. The efficiency of these polar chemicals for inhibiting storage hardening in NR follow the order hydroxylamine hydrochloride, diethylene glycol, and phenol, respectively. The mechanism of network formation during accelerated storage hardening was proposed to involve phospholipids at the chain ends of the NR molecule. Molecular structure analysis by Fourier transform infrared spectroscopy suggested that hydroxylamine inhibits storage hardening in NR by chemical interaction with phospholipid, apart from its polarity.
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Kuryanov, V. O., A. A. Luschtshyk et T. A. Chupakhina. « Glycosylated derivatives of substituted hydroxylamine. II. The phase transfer synthesis and the study of the glycosyl transfer reaction of glucosaminides of substituted hydroxylamine ». Russian Journal of Bioorganic Chemistry 39, no 4 (juillet 2013) : 426–33. http://dx.doi.org/10.1134/s1068162013030084.

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Reihani, Neda, et Hamzeh Kiyani. « Three-component Synthesis of 4-Arylidene-3-alkylisoxazol-5(4H)-ones in the Presence of Potassium 2,5-dioxoimidazolidin-1-ide ». Current Organic Chemistry 25, no 8 (28 avril 2021) : 950–62. http://dx.doi.org/10.2174/1385272825666210212120517.

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An efficient synthesis of 4-arylidene-3-alkylisoxazole-5(4H)-ones has been implemented via the three-component cyclocondensation of aryl(heteroaryl)aldehydes with hydroxylamine hydrochloride and β-ketoesters. The potassium 2,5-dioxoimidazolidin-1-ide has been introduced as the new organocatalyst to facilitate this heterocyclization. In the current process, three starting materials, including substituted benzaldehydes/heterocyclic aromatic aldehydes, hydroxylamine hydrochloride, and ethyl acetoacetate/propyl acetoacetate/butyryl acetoacetate have been successfully used to synthesize the number of substituted isoxazole- 5(4H)-ones in good to high yields in ethylene glycol as a green reaction medium at 80 ºC. The low catalyst loading is also a main advantage over some reported catalysts.
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Dietl, Andreas, Wouter Maalcke et Thomas R. M. Barends. « An unexpected reactivity of the P460cofactor in hydroxylamine oxidoreductase ». Acta Crystallographica Section D Biological Crystallography 71, no 8 (31 juillet 2015) : 1708–13. http://dx.doi.org/10.1107/s1399004715010706.

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Hydroxylamine oxidoreductases (HAOs) contain a unique haem cofactor called P460that consists of a profoundly ruffledc-type haem with two covalent bonds between the haem porphyrin and a conserved tyrosine. This cofactor is exceptional in that it abstracts electrons from a ligand bound to the haem iron, whereas other haems involved in redox chemistry usually inject electrons into their ligands. The effects of the tyrosine cross-links and of the haem ruffling on the chemistry of this cofactor have been investigated theoretically but are not yet clear. A new crystal structure of an HAO fromCandidatusKuenenia stuttgartiensis, a model organism for anaerobic ammonium oxidation, now shows that its P460cofactor has yet another unexpected reactivity: when ethylene glycol was used as a cryoprotectant, the 1.8 Å resolution electron-density maps showed additional density which could be interpreted as an ethylene glycol molecule covalently bound to the C16atom of the haem ring, opposite the covalent links to the conserved tyrosine. Possible causes for this unexpected reactivity are discussed.
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Pesyan, Nader Noroozi, Narmin Akhteh, Hana Batmani, Barış Anıl et Ertan Şahin. « A Facile and Catalyst-free Synthesis of Hexahydroacridine-1,8(2H,5H )-dione and Octahydroacridin-10(1H )-yl)thiourea Derivatives : Inter- and Intramolecular Aza-Michael addition ». Heterocyclic Communications 26, no 1 (10 mars 2020) : 26–32. http://dx.doi.org/10.1515/hc-2020-0005.

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AbstractAn easy and convenient technique for the one-pot synthesis of novel compounds of hexahydroacridine-1,8(2H,5H)-dione and octahydroacridin-10(1H)-yl) thiourea derivatives has been developed by the reaction of the octahydro-1H-xanthenes with hydroxylamine hydrochloride and thiosemicarbazide in ethylene glycol, which is a green solvent, under mild reaction conditions. IR, 1H NMR, 13C NMR spectrometry, and X-ray diffraction analysis were used to identify the structures of these compounds.
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LOPEZ-CAMACHO, Cristina, Jesus SALGADO, Juan Luis LEQUERICA, Alejo MADARRO, Esteban BALLESTAR, Luis FRANCO et Julio POLAINA. « Amino acid substitutions enhancing thermostability of Bacillus polymyxa β-glucosidase A ». Biochemical Journal 314, no 3 (15 mars 1996) : 833–38. http://dx.doi.org/10.1042/bj3140833.

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Mutations enhancing the thermostability of β-glucosidase A of Bacillus polymyxa, a family 1 glycosyl hydrolase, have been obtained after hydroxylamine mutagenesis of a plasmid containing the bglA gene, transformation of Escherichia coli with the mutagenized plasmid, and identification of transformant colonies that showed β-glucosidase activity after a thermal treatment that inactivated the wild-type enzyme. Two additive mutations have been characterized that cause replacement of glutamate at position 96 by lysine and of methionine at position 416 by isoleucine respectively. The thermoresistant mutant enzymes showed increased resistance to other denaturing agents, such as pH and urea, while their kinetic parameters did not change. CD spectra indicated that the E96K replacement caused an increase in α-helix content. The observed effect of the M416I mutation is consistent with the lower content of cysteine and methionine found in family 1 enzymes of thermophilic species compared with similar ones from mesophilic organisms.
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Qiu, Quan-Sheng, et Nan Zhang. « Water stress inhibits p-nitrophenyl phosphate hydrolysis activity of the plasma membrane H+-ATPase from soybean hypocotyls ». Functional Plant Biology 27, no 7 (2000) : 717. http://dx.doi.org/10.1071/pp00017.

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The influence of water stress on ATP and p-nitrophenyl phosphate (PNPP) hydrolysis by plasma mem-brane ATPases was investigated using plasma membrane vesicles purified from soybean hypocotyls by the sucrose gradient centrifugation method. Results showed that ATPase activity was reduced after 10% polyethylene glycol (PEG) 6000 treatment for 12 h. Water stress also moved the optimal pH from 6.5 to 7.0. A significant decrease in PNPP hydrolysis was observed under PEG treatment. The Km for PNPP hydrolysis was shifted from 2.3042 0.0009 to 2.5048 0.0346 mmol L –1 . Moreover, PNPP hydrolysis was more sensitive to vanadate after PEG treatment, while inhibition of ATP hydrolysis by hydroxylamine was not affected. Our experimental results indicated that water stress changed the catalytic mechanism of the plasma membrane H + -ATPase through affecting the dephosphorylation process catalysed by its phosphatase domain.
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Shenoy-Scaria, A. M., D. J. Dietzen, J. Kwong, D. C. Link et D. M. Lublin. « Cysteine3 of Src family protein tyrosine kinase determines palmitoylation and localization in caveolae. » Journal of Cell Biology 126, no 2 (15 juillet 1994) : 353–63. http://dx.doi.org/10.1083/jcb.126.2.353.

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Recent work has demonstrated that p56lck, a member of the Src family of protein tyrosine kinases (PTKs), is modified by palmitoylation of a cysteine residue(s) within the first 10 amino acids of the protein (in addition to amino-terminal myristoylation that is a common modification of the Src family of PTKs). This is now extended to three other members of this family by showing incorporation of [3H]palmitate into p59fyn, p55fgr, and p56hck, but not into p60src. The [3H]palmitate was released by treatment with neutral hydroxylamine, indicating a thioester linkage to the protein. Individual replacement of the two cysteine residues within the first 10 amino acids of p59fyn and p56lck with serine indicated that Cys3 was the major determinant of palmitoylation, as well as association of the PTK with glycosyl-phosphatidylinositol-anchored proteins. Introduction of Cys3 into p60src led to its palmitoylation. p59fyn but not p60src partitioned into Triton-insoluble complexes that contain caveolae, microinvaginations of the plasma membrane. Mapping of the requirement for partitioning into caveolae demonstrated that the amino-terminal sequence Met-Gly-Cys is both necessary and sufficient within the context of a Src family PTK to confer localization into caveolae. Palmitoylation of this motif in p59fyn also modestly increased its overall avidity for membranes. These results highlight the role of the amino-terminal motif Met-Gly-Cys in determining the structure and properties of members of the Src family of PTKs.
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Thèses sur le sujet "Glycosyl hydroxylamines"

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Talan, Rommel S. « Chemical Ligation of Glycopeptides ». University of Toledo / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1278958947.

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Marradi, Marco. « New chiral nitrones for stereoselective syntheses of biologically active natural products and their analogues ». Doctoral thesis, 2005. http://hdl.handle.net/2158/1161177.

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Use of carbohydrates (chiral pool) in organic synthesis through their transformation into chiral nitrones, as intermediates for the preparation of biologically active molecules (analogues of alkaloids)
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Chapitres de livres sur le sujet "Glycosyl hydroxylamines"

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« Samples of raw and treated slurry were centrifuged at 10,OOOg for 20 minutes at 10°C, as described by Hissett et al (25), to prepare the supernatants for the measurement of BOD. Determination. of. Total ..Organic A?ids, (TOA) TOA were determined, in the supernatant prepared as described by Hissett et al (25), by the method of Montgomery et al (26). The organic acids were esterified with acidified ethylene glycol. The esters were then reacted with hydroxylamine and the hydroxamic acids thus formed were converted to their ferric complexes and their concentrations were determined by optical density measurements at 500u. Gas-liauid Chromatography of VFA and TIP A Pye series 104 gas-liquid chromatograph (Pye Unicam Ltd.,Cambr idge,UK.) and a Packard model 439 gas-liquid chromatograph (Packard Instrument Ltd.,Reading,UK.) with a Hewlett Packard HP 3390A reporting integrator (Hewlett Packard Ltd.,Cheshire,UK.) were used. Determination of VFA were by direct injection of acidified supernatant samples into a 2.15 m long by 4mm ID packed column of 5% FFAP on Cnromosorb G.AW.DMCS 80/100 mesh. Determination of TIP were by direct injection of solvent extracts, of whole samples (30), into a 25 m long by 0.23 mm ID capillary column of WCOT fused Silica with liquid phase CP sil 5CB (United Technologies Packard,Reading,UK.). Odour Assessment The odour panel consisted of 21 College Staff who had previous odour panel experience (5) and 5 staff who were later recruited and whose performances at slurry odour assessments were judged to be similar to those of the original panellists. The method of assessment of odour offensiveness was based on that of Sobel (19). 20 ml samples of slurry were tranferred to 60 ml black glass bottles as described by Williams (5). These were handed to panellists in their own offices or laboratories where they were already accustomed to the background odour and were least hindered by interruption. The panellists were shown a copy of Table I and asked to assign the odour offensiveness of each sample to a value between 0 and 5. They were specifically requested not to consider the samples relative strength compared with the other samples. » Dans Odour Prevention and Control of Organic Sludge and Livestock Farming, 324. CRC Press, 1986. http://dx.doi.org/10.1201/9781482286311-121.

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