chitin chitosan by nmr and ir techniques
Tài liệu Báo cáo khóa học: Non-specific depolymerization of chitosan by pronase and characterization of the resultant products pptx
Ngày tải lên :
19/02/2014, 12:20
... Solid-state CP-MAS 13C -NMR spectra of chitosan, LMWC and freeze-dried chito-oligomers + monomer CP-MAS 13C -NMR and IR spectra indicated chitosan to have a b-conformation, as evidenced by the absence ... kV and variable pressure Infrared (IR) spectroscopy IR spectral studies were performed on a Perkin Elmer 2000 spectrometer under dry air at room temperature using KBr pellets Chitosan, LMWC and ... spectrometer at 100 MHz and 27 °C Results and Discussion Characterization of chitosan The molecular mass of purified chitosan was 71 ± kDa as determined by both viscometry and GPC The solid-state...
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study of through-thickness residual stress by numerical and experimental techniques
Ngày tải lên :
24/05/2014, 20:36
... residual stresses induced by quenching are similar along the X and Y directions (Fig 10) (for the directions see Fig 4) In this plate the residual stress field has been measured by the incremental large ... Flaman, M T and Lu, J Hole drilling and ring core methods In Handbook of Measurement of Residual Stresses (Ed J Lu) 1996, pp 5–34 (Society for Experimental Mechanics, New York) (Fairmont Press and Prentice-Hall, ... calculated residual stresses along the X and Y directions are similar and therefore just one of these stresses is presented The calculated residual stress along the Z direction is zero In the case of...
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LC-NMR and Other Hyphenated NMR Techniques doc
Ngày tải lên :
05/03/2014, 10:20
... SFE -NMR / 147 6.7 CE -NMR / 147 ix 95 131 143 x CONTENTS 6.8 CEC -NMR / 149 6.9 CZE -NMR / 150 6.10 cITP -NMR / 150 6.11 CapLC -NMR / 152 6.12 SPE -NMR / 154 6.13 SPE-MS -NMR / 159 6.14 Conclusions and ... separation techniques hyphenated with NMR and MS -NMR, with special emphasis on capillary capLC and SPE due to be available commercially, and their applications compared to the other hyphenated NMR techniques ... capLCNMR and solid-phase extraction (SPE) as SPE -NMR, including SPE hyphenated to MS -NMR as SPE-MS -NMR Many laboratories in industry and academia have NMR as a hyphenated technique as part of their...
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Báo cáo khoa học: Secondary structure assignment of mouse SOCS3 by NMR defines the domain boundaries and identifies an unstructured insertion in the SH2 domain pdf
Ngày tải lên :
16/03/2014, 14:20
... at their C termini, including the ‘BG loop’ and the ‘G’-strand (Fig 2) [24] Hortner et al [25] have modelled the structure of the SOCS3 SH2 domain and suggest that the BG loop and bG strand are ... Glu, Ser and Thr residues, the absence of Lys, His and Arg except at the termini, and the fact that it is completely unstructured based on the absence of medium- and long-range NOEs and the observation ... (22–142, 22–128, 22–126, 44–185, 44–142, 44–128 and 44–126), and the control 22–185 and 22–225 fragments, were expressed in inclusion bodies in E coli and required refolding The construct showing the...
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Báo cáo khoa học: Interaction of gymnemic acid with cyclodextrins analyzed by isothermal titration calorimetry, NMR and dynamic light scattering doc
Ngày tải lên :
16/03/2014, 14:20
... between 4.5 and 9.5 indicate that the chemical structures of both GA and c–CD and their interactions are little perturbed in this pH range The similar DH values at pH 7.4 in Tris ⁄ HCl and Pi indicate ... drugs, control of volatility and sublimation, physical isolation of incompatible compounds, long-term protection of color, odor and flavor, and suppression of hemolysis and the bitter tastes of drugs ... information about their specific molecular interaction to date In this study, we analyzed the interactions between GA and CDs using isothermal titration calorimetry (ITC), NMR and dynamic light scattering...
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Báo cáo khoa học: Structures and mode of membrane interaction of a short a helical lytic peptide and its diastereomer determined by NMR, FTIR, and fluorescence spectroscopy pdf
Ngày tải lên :
17/03/2014, 11:20
... The combined NMR, FTIR, fluorescence, and colorimetric studies point to the significance of segregation between the charged and hydrophobic regions of lytic peptides to membrane binding and its disruption, ... K4L7W and (B) K4L3l4W; and in SDS micelles: (C) K4L7W and (D) K4L3l4W The slowly exchanging amide protons are marked with filled circles The intensities of the NOE connectivities are indicated by ... b sheet structure and the region between 1640 and 1645 cm)1 corresponds to a random coil The amide I region of an a helical structure is located between 1650 and 1655 cm)1, and the amide I region...
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Báo cáo khoa học: Structure and positioning comparison of two variants of penetratin in two different membrane mimicking systems by NMR pdf
Ngày tải lên :
23/03/2014, 18:20
... temperature was 37 °C and the pH 5.5 The nonactive penetratin(W48F,W56F) variant was studied by high resolution NMR in both phospholipid bicelles and SDS micelles Experiments and assignments were ... (filled squares) and penetratin(W48F,W56) (open squares) in phospholipid bicelles with q ¼ 0.5 and [DMPG]/[DMPC] ¼ 0.1 (B) penetratin (filled circles) and penetratin(W48F,W56F) (open circles) in 300 ... Env peptide revealed by NMR dipolar coupling measurement in stretched polyacrylamide gel J Am Chem Soc 124, 2450–2451 25 Andersson, A & Maler, L (2002) NMR solution structure and ¨ dynamics of motilin...
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Báo cáo Y học: Conformational analysis by CD and NMR spectroscopy of a peptide encompassing the amphipathic domain of YopD from Yersinia potx
Ngày tải lên :
31/03/2014, 21:21
... spectroscopy and 2D homonuclear/heteronuclear NMR spectroscopy Using these peptides, the interaction between the amphipathic domain of YopD and its cognate chaperone LcrH was investigated by NMR EXPERIMENTAL ... no residues were in disallowed regions, Ramachandran plot analysis was conducted using the program PROCHECK -NMR [37] RESULTS AND DISCUSSION CD and NMR studies Computer analysis of YopD primary ... are indicated by an index with values of )1, and +1, which corresponds to upfield, random coil and downfield, respectively This image was constructed using the VINCE software (The Rowland Institute...
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báo cáo khoa học: "Concomitant pulmonary and thyroid tumors identified by FDG PET/CT and immunohistochemical techniques" ppt
Ngày tải lên :
09/08/2014, 02:21
... Concomitant pulmonary and thyroid tumors identified by FDG PET/CT and immunohistochemical techniques Guangwen Zhu1, Jia Liu*2, Hong Li2, Yanjun Zhang1, Yaming Li3 and Shujun Liang4 Address: ... performed, and resection specimens of lung and thyroid were detected by hematoxylin eosin staining (HE) and IHC PET / CT: lung tumor SUVmax: 3.69, delay: 5.17; and thyroid tumor SUVmax 19.97 HE reveal ... the tumor in terms of the SUVmax in 3.69 and the delay SUV in 5.17 (Figure1:A and B), and no abnormal FDG uptake was found in the nodule-free lung tissues and mediastinum space It was also found...
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Báo cáo khoa học: "Evapotranspiration measurements in a Mediterranean forest stand by means of ecophysiological and microclimatic techniques" ppsx
Ngày tải lên :
09/08/2014, 02:21
... determined by adding a blue dye to the water and counting with a microscope the number and area of vessels filled by the solution The relationship between the real sap velocity ( Vs) and the heat ... predawn potential was about -0.5 MPa water for both sprouts and standards and it reached minimum values (-2.6, -2.8 MPa for sprouts and standards, respectively) during September rates measured with ... Fig After an initial increase due to a large evaporative demand at the beginning of July, transpiration measured by Bowen ratio and hpv techniques decreased continuously following the water stress...
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Nanostructure, biopiezoelectric and bioferroelectric behaviors of mollusk shells studied by scanning probe microscopy techniques
Ngày tải lên :
10/09/2015, 09:23
... Last row are the magnitude [(k) and (m)] and argument [(l) and (n)] images of vectorPFM in the x-z [(k) and (l)], and y-z [(m) and (n)] planes Fig 5.5 Topographic and PFM images of deproteinated ... 2nd and 3rd column (400× 400 nm ): observed from the interior and boundary of platelet on the nacre surface (a) (d) and (g) are height images, (b) (e) and (h) are amplitude images, and (c) (f) and ... the dry and wet nacres (i.e., the brick and mortar structure) were reported to be 70 GPa and 60 GPa respectively, and the tensile strengths of dry and wet nacres were found to be 170 MPa and 140...
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Probing protein dynamics and protein protein interaction by NMR spectroscopy
Ngày tải lên :
11/09/2015, 10:17
... group, for always being helpful and for making the lab a pleasant and inspiring workplace I will be forever grateful to my families Without their unending and untiring support, I cannot even start ... Code: 1BBB, blue) and and the model obtained by docking separated subunits together (red) The comparison was made by superimposing Cα 105 X SUMMARY NMR is one of the techniques for protein ... After several decades, NMR was first discovered independently by Purcell et al and Bloch et al in 1946 Purcell observed NMR signal from Paraffin wax (Purcell et al 1946) and Bloch observed proton...
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Structural and equilibrium unfolding studies of sam domain of DLC1 by NMR spectroscopy
Ngày tải lên :
14/09/2015, 14:04
... basics of NMR spectroscopy and the protein structure determination by NMR spectroscopy 1.2.1 Fundamentals of NMR spectroscopy Although different detecting techniques and probes are used in NMR spectrometers, ... structure and the dynamics of proteins Major improvements in NMR hardware (such as magnetic field strength and cryoprobes) and NMR methodology, combined with biochemical methods for the preparation and ... integral component of the Ets1-SAM, as evidenced by NMR- based structural and relaxation studies and its presence is required for proper protein expression and folding (Slupsky et al 1998) However, such...
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Mapping of the binding surface between EPHA5 and antagonist peptide by NMR spectroscopy
Ngày tải lên :
16/10/2015, 15:38
... Interface between EphA5 and WDC by NMR 46 3.10.1 Mapping of EphA5-binding interface within WDC by NMR and ITC 46 3.10.1.1 Interaction of WDC-mutant peptides with EphA5 by NMR … 46 3.10.1.2 Interaction ... characterizations of both EphA5 and WDC were assessed by CD and NMR VI Furthermore, characterizations of binding interactions between EphA5 and WDC peptide were characterized by NMR and ITC The binding surface ... NMR hardware, better developed NMR methodology and advanced computer, and multidimensional NMR spectroscopic techniques, today NMR has been widely applied in the areas of chemistry, biology and...
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Teaching pronunciation of english consonants by using contrasting and substituting techniques
Ngày tải lên :
05/11/2015, 20:52
... of Minimal pair drills Each pair consists of the original Vietnamese word and the newly-created one Students are required to pronounce both words of each pair Furthermore, these techniques can ... children learning their first language and of children and adults learning foreign languages in noninstructional settings” (Celce-Murcia et al, 1996, p.:3) One of the most significant techniques that ... and Vietnamese, such as the sounds spelled th in Vietnamese and in English These techniques can make use of the strength of some previous approaches, such as listening and repeating of the Direct...
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chitin and chitosan: Chemistry, propertíes and applications
Ngày tải lên :
24/08/2016, 16:29
... 337 Chitin and Chitosan – Chitin and Chitosan in Life Science, edited by T Uragami, K Kurita and T Fukamizo (Kodansha Scientific Ltd, Tokoyo, Japan) 2001 Lim S & Hudson S M, Review of chitosan and ... wave agents, hair colorants, styling lotions, hair sprays, and hair tonics Several derivatives of chitosan and chitin have potential applications in hair care They include glyceryl chitosan, an ... 3-29 Hirano S, N-acyl, N-arylidene- and N-alkylidene chitosans, and their hydrogels, Chitin handbook, edited by R A A Muzzarelli and M G Peter, (European Chitin Society, Italy) 1997, pp.71-76...
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Nghiên cứu tìm hiểu ứng dụng chitin, chitosan
Ngày tải lên :
23/04/2013, 21:17
... phẩm chitosan Vậy chitosan đơn chất mà nhóm sản phẩm chitin bị loại nhóm acetyl phần (Attila E, Pavlath and Dominic W S Wong, 1996) 1.3 Cấu trúc chitin, chitosan: 1.3.1 Cấu trúc chitin: Chitin ... deacetyl hóa thu chitosan Số sóng (cm-1) Hình1 Phổ IR Chitin (A) Chitosan (B) Độ tinh khiết Chitosan kiểm tra hai phương pháp hóa học (Cho Chitosan hòa tan hoàn toàn dung dịch CH3COOH 1%, Chitosan tan ... nhiên, chitin tồn dạng cấu hình: α, β, γ- chitin; phổ biến α -chitin, β -chitin Do cấu hình chitin khác nhau, dẫn đến chúng có số tính chất khác nhìn chung chitin có tính chất sau: Cả celluloze chitin...
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Presentation Organizational method and constructing techniques
Ngày tải lên :
27/04/2013, 13:28
... to ASTMC150 standard (AASHTO M85) 5.3 Sand - Supply must be clean, dirt-free yellow sand that follows AASHTO M6 requirements Sand quality check must be governed by ASTM standard Sand sample must ... fence and warning signs Explosion and fire 3.1 Standard, codes for fire, explosion prevention: - TCXD 218: 1998 Fire detection and fire warning- general provisions - TCVN 3254: 1989 General requirements ... waste site by 12 ton truck 7.2 Ground handling and sand pad layer • Handle the ground as specified by the design drawings (if available) • Construct the sand layer of 10 cm thick - Sand layer...
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