redox titration oxalic acid and potassium permanganate

... as hydrogen bond and hydrophobic contacts and hydra- tion upon binding on thermodynamics and its correla- tion with structure. These analyses may help us to generally understand the molecular ... glycer- aldehyde-3-phosphate dehydrogenase and induce a smearing of its electrophoretic band and dephosphoryla- tion. FEBS Lett 579, 4333–4336. Interaction of gymnemic acid with cyclodextrins Y. Izutani ... isother- mal titration calorimetry revealed that the association constant of GA and c-CD is 10 5 )10 6 m )1 with favorable enthalpy and entropy changes. The heat capacity change was negative and large,...

Ngày tải lên: 16/03/2014, 14:20

... occur. The same seems to hold for the derivatives of mandelic acid: 3,4-dihydroxymandelic acid is oxidized by tyrosinase, whereas 4-hydroxymandelic acid is not [24]. Although the studies with N. crassa tyrosinase ... alpha- (3,4-dihydroxyphenyl)-lactic acid. Biochem. J. 277, 849–853. 35. Land, E.J. & Riley, P.A. (2000) Spontaneous redox reactions of dopaquinone and the balance between the eumelanic and phaeo- melanic ... 2,3-dihydroxybenzoic acid and 2,5-dihydroxybenzoic acid [18], although in this case the results are controversial, as these compounds should be poor substrates for tyrosinase. On the other hand, 3,4- dihydroxybenzoic...

Ngày tải lên: 31/03/2014, 09:20

Ngày tải lên: 07/07/2014, 00:20

... was elevated and the granulation tissue was removed showing the true extension and depth of the infra-bone defect. Debridement and root preparation were carried out with hand and ultrasonic ... by EHA and autologous grafting, 4 males and 5 females, all non smokers, with a mean age of 43,8 years for females, 40,0 years for males and 42 years for all the group, in good health and with ... immediately before treatment and at 10 days, and 6, 9, and 24 months after treatment . Clinical Measurements To assess the treatment results, the following pre-operative and intra-operative clinical...

Ngày tải lên: 03/11/2012, 11:35

... 2.7: Hiệu quả kích kháng của oxalic acid lên tỉ lệ diện tích vết bệnh trên lá (%) ở các thời điểm 40, 50 và 60 NSKS 42 Hình 2.8: Hiệu quả kích kháng của oxalic acid lên tỉ lệ bệnh thối cổ bông ... 2.13: Hiệu quả kích kháng của oxalic acid lên tỉ lệ diện tích vết bệnh trên lá (%) ở các thời điểm 40, 50 và 60 NSKS 50 Hình 2.14: Hiệu quả kích kháng của oxalic acid lên tỉ lệ bệnh thối cổ bông ... 2001) và mô học (Huỳnh Minh Châu và ctv,2001). 6. Đặc tính oxalic acid và tác động của nó đối với cây trồng Tên hóa học: OXALIC ACID Công thửc hóa học: Thường tồn tại ở dạng ngm 2 phõn t...

Ngày tải lên: 10/04/2013, 21:05

... (9%), and palmitic (5-6%) acids, and trace amounts of arachidic, cis-vaccenic, linolenic, and palmitoleic, eicosa-11-enoic acids, and eicosa-13-enoic (in one fruit only) acids. KEYWORDS: Momordica ... authors also reported 101 ( 38 and 22.1 ( 15.2 àg -carotene/g FW in extracted samples of aril and mesocarp, respectively, and 16 and 9 àg/g of zeaxanthin and 35 and 2 àg/g of -cryptoxanthin in ... of Vitamin E and omega-3 fatty acids (21), although our data show only 0.3-0.8% linolenic acid (Table 2). Seeds of tropical plants may contain high levels of saturated fatty acids, with palmitic acid...

Ngày tải lên: 09/02/2014, 00:08

... residues and loss of cell–cell contacts induced by calyculin A and okadaic acid in human epidermal cells. Exp Cell Res 231, 163–172. 16 Pasdar M, Li Z & Chan H (1995) Desmosome assembly and disassembly ... Vale and L. M. Botana DSPs and the cytoskeleton FEBS Journal 275 (2008) 60606066 ê 2008 The Authors Journal compilation ê 2008 FEBS 6065 MINIREVIEW Marine toxins and the cytoskeleton: okadaic acid and ... 2008) doi:10.1111/j.1742-4658.2008.06711.x Okadaic acid (OA) and its analogs, the dinophysistoxins, are potent inhibi- tors of protein phosphatases 1 and 2A. This action is well known to cause diarrhea and gastrointestinal...

Ngày tải lên: 18/02/2014, 14:20

... cyanide binding, redox potential and auto-oxidation rates of Ec DOS PAS, and catalytic activities of full-length enzymes. We found that the mutations at Asp40 markedly altered t he redox potential and auto-oxidation ... axial ligand f or the F e(II) complex trans to His77 [4,5]. The haem redox potential value was decreased from +67 mV vs. SHE (wild-type) to )26, )1, and )122 mV in t he Met95Ala, M et95Leu and Met95His ... mutations at Asp40 markedly alter the redox pot entials, auto-oxidation ra tes and cataly tic activities of Ec DOS. Breakage of the salt bridge between Asp40 and Arg85, and t he hydrogen bond network consisting...

Ngày tải lên: 19/02/2014, 16:20

... amino acid sequence of GALA revealed very high similarity to the endogalactanases of A. tubingensis (95.7% amino acid sequence identity) and A. aculeatus (78.9% amino acid sequence identity) and ... min D -galactose, D -galactobiose and D -galactotetraose were used as standards to identify the D -galactose and D -galacto-oligosaccharides. The calculated areas for D -galactose and D -galacto-oligosaccharides ... endogalactanases (between 21% and 28% amino acid sequence identity). This is illustrated by a CLUSTALW analysis [29] of the deduced amino acid sequences of GALA and b-1,4-endogalactanases of Aspergillus...

Ngày tải lên: 21/02/2014, 01:21

... (UDP-Xyl) and UDP-D- glucuronic acid (UDP-GlcA) were 7.4 min, 7.8 min and 11.8 min, respectively, under identical assay conditions. T. Oka and Y. Jigami Synthesis of UDP-glucuronic acid and UDP-xylose FEBS ... for the production of UDP-glucuronic acid via myoinositol has also been identified and characterized. Synthesis of UDP-glucuronic acid and UDP-xylose T. Oka and Y. Jigami 2646 FEBS Journal 273 ... UDP-d-glucuronic acid (UDP-GlcA) and UDP-d-xylose (UDP-Xyl) in the synthesis of cell wall polysaccharides and for attachment Keywords Saccharomyces cerevisiae; UDP-glucuronic acid; UDP-glucuronic acid decarboxylase; UDP-glucose...

Ngày tải lên: 07/03/2014, 12:20

... protons and protons from a, b and c positions of 3-hydroxy fatty acids are marked with; -CH ẳ CH-, -CH 3 ,and- CH 2 -, a, b and c, respectively. CHCl 3 ,DMSOandH 2 O represent signals from solvents and ... 3-OH-i-13:0 and two 3-OH-20:0 acids, as well as two ester-bound acids (e.g. 20:0 and 27-OH-28:0). This is merely one possible explanation due to the fact that numerous combinations of fatty acids different ... 2,3-diamino-2,3-dideoxyglucose (DAG) and a complex set of fatty acids (both ester and amide bound), as described previously [24], but also galacturonic acid and phosphate residues. The presence...

Ngày tải lên: 07/03/2014, 15:20

... 5-hydroperoxyeicosatetraenoic acid derived from arachidonic acid in ACTH-stimulated steroidogenesis in rat adrenal glands. J. Endocrinol. 125, 89–96. 23. Wang, X. & Stocco, D.M. (1999) Cyclic AMP and arachidonic acid: ... [12–16]. Several reports have shown that arachidonic acid (AA) and its metabolites play an essential role in the regulation of steroidogenesis and both the expression and function of StAR [17–26]. Adrenal cholesterol ... vivo.Comparisonoflowandhighdensitylipopro- teins of human and rat origin. J. Biol. Chem. 256, 7362–7370. Ó FEBS 2002 Acyl-CoA thioesterases and synthetase on steroidogenesis (Eur. J. Biochem. 269) 5607 and...

Ngày tải lên: 08/03/2014, 09:20

... ribitol teichoic acid from the cell wall of S. azureus RIA 1009 [24] and based on the analysis of the products formed upon acid and enzymatic hydrolysis. Acid hydrolysis afforded glucose and ribitol ... 3-deoxy- D - glycero - D - galacto -non-2- ulopyranosonic acid, a teichuronic acid, and a b-glucosylated ribitol teichoic acid in the cell wall of plant pathogenic Streptomyces sp. VKM Ac-2124 Alexander S. Shashkov 1 , Larisa ... ribitol teichoic acid from Table 2. 1 H NMR chemical shifts (d, p.p.m) for the teichuronic acid (polymer I), the Kdn-containing polymer (polymer II), and the ribitol teichoic acid (polymer III)...

Ngày tải lên: 17/03/2014, 10:20

... analogues and other longer ligands are required to establish the mechanism of ligand binding and product formation. Ascorbic acid inhibits the functional activity of HylP2 Ascorbic acid has previously ... near the b-strands, b4 and b5, and the interactions involve residues AspA151, GlyB165 and LysB166. At least six hydrogen bonds have been observed between the protein and the ligand (Table 3). ... reservoir solutions containing ascorbic acid and lactose, respectively. The crystal structures of native HylP2 and its two complexes with ascorbic acid and lactose have been determined. HylP2 folds...

Ngày tải lên: 23/03/2014, 04:21

... binding to different TGA factors and transcriptional activation potential. Nucleic Acids Res. 30, 775–781. 46. Johnson, C., Boden, E. & Arias, J. (2003) Salicylic acid and NPR1 induce the recruitment ... Salicylic acid is not required for Cf-2-andCf-9-dependent resistance of tomato to Cladosporium fulvum. Plant J. 23, 305–318. 44. Lam, E. & Lam, Y.K P. (1995) Binding site requirements and differential ... Clarke,J.D.,Volko,S.M.,Ledford,H.,Ausubel,F.M.&Dong, X. (2000) Roles of salicylic acid, jasmonic acid, and ethylene in cpr-induced resistance in Arabidopsis. Plant Cell 12, 21752190. 22. Strompen,G.,Gru ă ner,...

Ngày tải lên: 23/03/2014, 15:21

... (part of loop D, linking b-strands 4 and 5) and bG430–bV434 (part of loop E, linking b strands 5 and 6) were identified as redox- sensitive regions, regulated by the redox- state of NADP(H), that ... bD392C and bT393C in loop D, and bG430C and bA432C in loop E, were included. All loop D and E mutants, especially bI406C and bG430C, showed increased ratios between the rates of the forward and ... The beginning and end of loop D (excluding a5) and E are P403-V411 and M427-G433, respectively. The illustration was prepared using the software MOLMOL [26]. Fig. 2. The amino -acid sequence of ecIII and...

Ngày tải lên: 31/03/2014, 09:20

Ngày tải lên: 05/05/2014, 08:42

Ngày tải lên: 18/06/2014, 15:20

Ngày tải lên: 29/06/2014, 13:20

Ngày tải lên: 07/08/2014, 10:21