biological activities of chitin and chitosan derivatives
Optimization of chitin and chitosan extraction from by product from white leg shrimp (penaeus vannamei) industry in vietnam to improve its quality and efficiency
Ngày tải lên :
15/08/2015, 22:14
... respectively, the chitin and protein contents of head and shell are largely different The chitin content of shell and head of white shrimp were 27.37 and 11.40%, respectively The chitin content ... fishmeal and chitin were produced This way of treatment caused the recovery of useful compounds to be lost the efficiency and to pollute environment concurrently The industry of chitin and chitosan ... Germay) and has the frequency of 37kHz and RMS of 35W CHAPTER III: RESULTS AND DISCUSSION 3.1 Characteristics of the white leg shrimp by - product The mass average ratio of head and shell of shrimp...
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Extraction and characterization of chitin and chitosan from marine sources in Arabian Gulf
Ngày tải lên :
25/08/2016, 11:21
... differences in the IR spectra of chitin can be used to distinguish between a -chitin and b -chitin (i) Due to the different arrangement between a -chitin and b -chitin, amide I band in a -chitin spectrum splits ... organization and dense structure was observed clearly for a -chitin, whereas the surface of b -chitin appears less crystalline and different from a -chitin 3.3 Deacetylation of chitin 3.3.1 Preparation of chitosan ... electron microscopy (SEM) The surface morphology of chitin and chitosan was observed using SEM The dried sample of chitin and chitosan was ground and then coated with gold under vacuum using a...
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Functional Characterization of Chitin and Chitosan
Ngày tải lên :
25/08/2016, 11:35
... 20041 Chitin and chitosan 119 2040 11804 effects of the preparation process on the properties of chitin and chitosan and regulatory aspects The second part covers the main biological properties of ... configurations of Chitin (A) -chitin, (B) ß -chitin and (C) -Chitin known These are the heterogeneous deacetylation of solid chitin and the homogeneous deacetylation of pre-swollen chitin under ... levels of transfection Lavertu et al studied several combinations of Mw and DA of chitosan finding two combinations of high transfection efficiency using a chitosan of 10 kDa and DD of 92 and 80%,...
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Báo cáo y học: " In vitro activities of novel 4-HPR derivatives on a panel of rhabdoid and other tumor cell lines" docx
Ngày tải lên :
13/08/2014, 18:21
... mechanism of action of these new compounds nor tested activities on a wide range of RT or non-RT cell lines Here we tested the efficacy of 4-HPR and highly active halogen-substituted (5h and 5j) and ... 12, 13] Induction of apoptosis in rhabdoid tumor cells by 4-HPR and 4-HPR derivatives and peptidomimetics Though the nature of induction of cell-cycle arrest by 4-HPR and its derivatives varied ... ATRA, B 4-HPR, C and D 4-HPR derivatives, 5h (C) and 5j (D) E-G 4-HPR peptidomimetics, 11a (E), 11c (F), and 11d (G): Figure Inhibition of RT cell growth by 4-HPR and its derivatives and peptidomimetics:...
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Study on chemical constituents and biological activities of some plants of boerhaavia genus (nyctaginaceae)
Ngày tải lên :
24/08/2015, 12:40
... OA of the mixed solution (*) with replacement 25µl of buffer B, instead of 25µl of samples OA2: the OA of the mixed solution (*) with replacement 50µl of buffer B, instead of 25µl of samples and ... Hz, H-10) and 6.01 (s, H-6) The splitting of signals and coupling constants of protons at δH 8.28, 7.01 and 6.94 demonstrated two ortho-coupled protons of H–1, H–2 and H–3 of the A ring and the ... and 25µl of 0.22 U/ml AChE OA3: the OA of the mixed solution (*) OA4: the OA of the mixed solution (*) with replacement 25µl of buffer B, instead of 25µl of 0.22 U/ml AChE Evaluation of the result...
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Synthesis and biological evaluation of 2 substituted benzimidazole derivatives
Ngày tải lên :
02/09/2015, 13:45
... activity of the test compounds was evaluated by carrageenan induced rat paw edema model of Winter et al (1962) Rats of either sex were treated with benzimidazole derivatives (100 mg/kg p.o.) and standard ... was directed to the proximal third of the tail The tip of the tail of the mice was individually 718 Table G Mariappan et al Analgesic activity of benzimidazole derivatives on mice by using tail-flick ... mice (20–25 g) and albino rats weighing (150–200 g) of either sex were used as experimental animals All the animals were housed in groups of 4–8 per cage at a temperature of 25 ± °C and a relative...
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Study on chemical constituents and biological activities of the lichen parmotrema Praesorediosum(NYL ) hale(parmeliaceaf)
Ngày tải lên :
15/12/2015, 15:22
... IR, MS and NMR spectra of PRAES-C1 146 Appendices 8-15: IR, MS and NMR spectra of PRAES-E14 149 Appendices 16-21: MS and NMR spectra of PRAES-C10 153 Appendices 22-26: MS and NMR spectra of PRAES-C11 ... correlations of PRAES-E1 and PRAES-T2 48 Figure 3.8 HMBC correlations of PRAES-E11, PRAES-T4 and PRAES-E2 52 Figure 3.9 HMBC and NOESY correlations of PRAES-C22 54 Figure 3.10 HMBC and NOESY correlations ... 62 Figure 3.14 HMBC and NOESY correlations of PRAES-C25 and PRAES-C26 63 xiv Figure 3.15 HMBC correlations of PRAES-C9 and PRAES-C7 67 Figure 3.16 COSY and HMBC correlations of PRAES-E18 70 Figure...
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STUDY ON CHEMICAL COMPOSITIONS AND BIOLOGICAL ACTIVITIES OF annona glabra l
Ngày tải lên :
28/04/2016, 17:48
... compositions and biological activities of Annona glabra L So, the thesis’s title was proposed to be "Study on chemical compositions and biological activities of Annona glabra L." Subject and contents of ... spectrum of Figure 4.32 COSY spectrum of 4.2 Evaluation of biological activities Figure 4.29 DEPT spectrum of Figure 4.31 HMBC spectrum of Figure 4.33 NOESY spectrum of t 4.2.1 Cytotoxic activity of ... up-regulation of Bax, down-regulation of Bcl-2, cleaves of caspase-3, and cleaves of PARP These results indicated that compounds 18 and 22 induced apoptosis via alteration of expression of apoptosis-related...
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Photodegradation and removal of phenol and phenolic derivatives from petroleum refinery wastewater using nanoparticles of TiO2
Ngày tải lên :
05/09/2013, 17:03
... expanded since the discovery of the photocatalytic properties of TiO2 and the demonstration of its effectiveness to generate hydroxyl radicals in the presence of UV light [8] The more activity of ... treatment using nanoparticles of TiO2 and UV light The main feature of this work is the use of inexpensive and recoverable catalyst This sort of processes for degradation of organic compounds may ... black run) and with UV light (both with 100 mg L−1 of TiO2, and temperature of 303 K) Figure shows, very low reduction of COD which was found in the absence of light The increase of temperature...
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Tài liệu Báo cáo khoa học: Branched N-glycans regulate the biological functions of integrins and cadherins doc
Ngày tải lên :
18/02/2014, 17:20
... the upregulation of GnT-III In fact, the results of several studies suggest that E-cadherin can induce ligand-independent activation of EGFR and subsequent activation of Rac1 and MAP kinase, which ... overexpression of GnT-III inhibited a5b1-mediated cell spreading and migration, and phosphorylation of FAK [61] The binding affinity of a5b1 for fibronectin was significantly reduced after introduction of a ... dysregulation of TGF-b1 receptor activation and signaling Loss of core fucosylation also resulted in downregulation of the EGFR-mediated signaling pathway [43] Downregulation of TGF-b receptor, EGFR and...
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Báo cáo khoa học: Role of different moieties from the lipooligosaccharide molecule in biological activities of the Moraxella catarrhalis outer membrane pot
Ngày tải lên :
07/03/2014, 05:20
... OS and consisted of a linker (Glc-Kdo2)-lipid A structure The phenotype of this mutant was examined to investigate the roles of different moieties of the LOS molecule in biological activities of ... lipid-A and two phosphate moieties The ions with m ⁄ z of 1519.6 and 1541.6 are mono- and di-sodiated forms of the de-O-acylated LOS and the ion with m ⁄ z of 1479.6 is the anhydrous form of the ... m ⁄ z of 2654.8, 2694.8 and 2717.4 indicates the presence of the anhydro form and mono- and di-sodiated form of the molecular ion 2672.8 (Fig 4A) Among other characteristic ions, 1558.2 and 1778.4...
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Báo cáo khoa học: Murine serum nucleases – contrasting effects of plasmin and heparin on the activities of DNase1 and DNase1-like 3 (DNase1l3) doc
Ngày tải lên :
30/03/2014, 02:20
... from the zymograms of DNase1 and DNase1l3 By comparing the properties of rmDNase1 and rmDNase1l3 in the hydrolysis of pDNA and chromatin with those of serum collected from WT and DNase1 KO mice, ... digestion facilitated by rmDNase1 and rmDNase1l3 (A) Effect of increasing amounts of heparin on pDNA digestion by rmDNase1 and rmDNase1l3, employing 0.1 and lL of cell culture supernatants, respectively ... rmDNase1 (no inhibitory influence of Tris and approximately half activity in the presence of 150 mm NaCl) (data not shown) Detection of DNase1 and DNase1l3 in murine serum and tissues by DPZ To clarify...
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a means to an end the biological basis of aging and death apr 1999
Ngày tải lên :
11/06/2014, 05:26
... and Lifespan, T h e Nature of Cellular Senescence and Death, T h e Evolution of Senescence and Death, 21 41 Of Embryos and Worms and Very Old Men: T h e Developmental Genetics of Senescence and ... food and oxygen T h e death of a relatively small number of brain cells through lack of oxygen, and the consequent inability of the brain to coordinate physiological activities in the rest of the ... loses elasticity and tone because of changes in collagen, the major protein of all connective tissue, and becomes wrinkled because of both collagen changes and an increased production of a protein...
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Báo cáo y học: "Functional, radiological and biological markers of alveolitis and infections of the lower respiratory tract in patients with systemic sclerosis" pdf
Ngày tải lên :
12/08/2014, 18:22
... observed in 12 (50%) of the 24 dSSc patients and in 10 (41.7%) of these patients FVC and DLCO ≤ 69% occurred Of the 76 lSSc patients, FVC and DLCO ≤ 79% was observed in (5.3%) and FVC and DLCO ≤ 69% ... DLCO and patients with normal PFTs Characteristics of the groups are detailed in Table 16 (16.0%) patients had FVC and DLCO ≤ 79%: 12 of these patients had FVC and DLCO ≤ 69% and had FVC and DLCO ... the extent of involvement in each of defined regions: above aortic arch, between arch and inferior pulmonary veins and between inferior pulmonary veins and lung base The mean estimate of the three...
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Direct asymmetric vinylogous reactions of furanones and phthalide derivatives with bifunctional and trifunctional organocatalysts
Ngày tải lên :
10/09/2015, 08:24
... of Furanones and Phthalide Derivatives with Bifunctional and Trifunctional Organocatalysts Luo Jie (BSc, Zhejiang Univ.) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF ... love and support throughout my studies Without their help, I cannot complete this work Table of Contents Summary List of Tables List of Schemes List of Figures List of Abbreviations List of Publications ... Derivatizations of the vinylogous aldol adducts 57 2.4.4.1 Preparation of lactone 57 2.4.4.2 Preparation of glycerol derivatives 60 2.4.4.3 Preparation of antifungal agent 62 2.4.5 Analytical data of products...
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Asymmetric synthesis of furan and oxindole derivatives with bifunctional and multifunctional organic catalysts
Ngày tải lên :
10/09/2015, 09:06
... in almost all types of reactions, and good selectivities can often be achieved by combining chiral ligands and suitable metals However, high cost and toxicity of the metals, and stringent reaction ... development of asymmetric synthesis of furan and oxindole derivatives with tertiary amine thiourea organocatalysts, including enantioselective synthesis of 3(2H)-furanones and 2,3-dihydrofurans with ... Manipulation of 3-Heteroatom Oxindole Products 158 5.4.5 X-Ray Crystallographic Analysis and Determination of Configurations of the 3-Chlorooxindole and 3Sulfenyloxindole Products 5.4.6 Analytical Data of...
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Synthesis and applications of epicatechin and epiafzelechin derivatives from proanthocyanidins
Ngày tải lên :
11/09/2015, 10:18
... proanthocyanidins from the rhizomes of Selliguea feei and synthesis of epiafzelechin derivatives 110 8.6.1 Extraction and characterization of proanthocyanidins from the rhizomes of Selliguea feei ... (PBPs) and grape seed proanthocyanidins (GSPs) via MALDITOF-MS and thiolysis analysis Both thiolysis and MALDI-TOF-MS results indicated that MPPs were ideal for synthesis of the new chiral ligands ... 4-position of the ‘upper’ unit and the 8-position or 6-position of the ‘lower’ unit A-type proanthocyanidins possess an additional ether linkage between C-2 of the upper unit and a 7- and/ or 5-OH of...
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Part 1 total synthesis and biological evaluation of antillatoxin and fragments part II synthetic studies towards the total synthesis of cytochalasans and tuberostemonine
Ngày tải lên :
16/09/2015, 08:31
... stereochemistries of C4 and C5 In our group, we have been working on the synthesis of the isomers of C4 and C5 as NOE studies of large rings is known to be unreliable.9 Later, the NMR data of the synthetic ... understanding the roles and functions of emerging biological targets and in validating their biological responses Developing asymmetric synthesis-derived organic reactions allows the synthesis of ... Synthesis and Biological Evaluation of Antillatoxin and Fragments Chapter : Total Synthesis of Antillatoxin 1.1 Historical Background Marine cyanobacteriums are well known to be the rich source of structurally...
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chitin and chitosan: Chemistry, propertíes and applications
Ngày tải lên :
24/08/2016, 16:29
... hair sprays, and hair tonics Several derivatives of chitosan and chitin have potential applications in hair care They include glyceryl chitosan, an adduct of an oligomer of hydrolyzed chitosan, ... n-hydroxypropyl chitosan, quaternary hydroxypropyl-substituted chitosan, polyoxyalkylene chitosan, chitosan oligosaccharides, chitin sulphate, and carboxymethyl chitin Some derivatives of chitosan can ... 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...
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