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Pre formulation studies on microcrystalline cellulose for grouping and predicting their performance in extrusion spheronization
... INTRODUCTION DRY MIXING • o Mixer type o Mixing time and speed Mixing of powdered components in the formulation WET GRANULATION • • o Equipment type o Granulating liquid o Mixing time and speed ... found to exert the most dominant effects On the basis that peak torque and energies of mixing values were strongly correlated to the properties of MCC spheroids prepared in extrusion-spheronization, ... Cumulative energies of mixing (CEM) values for PH 101, PH 102, PH 301, PH 302, Ceolus 801, Ceolus 802 and Celex from 75–175 % w/w water 158 Table 13 (cont’d) Cumulative energies of mixing (CEM) values...
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Báo cáo y học: " Acceptability of Carraguard, a candidate microbicide and methyl cellulose placebo vaginal gels among HIV-positive women and men in Durban, South Africa" pps
... (2.5% methylcellulose) Applicators contained ml of gel each, and were designed to dispense approximately ml at a single use, however 4–5 ml was dispensed and adherence and acceptability was measured ... http://www.aidsrestherapy.com/content/4/1/20 use period (Day 14 visit for women and Day visit for men) The questionnaire contained approximately 70 questions that covered a range of parameters such as participants' opinions of product ... the gel, and many of them reported a preference for the gel over condoms Finally, there was a strong desire for the ideal microbicide to enhance sexual pleasure for both partners (Table 4) http://www.aidsrestherapy.com/content/4/1/20...
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Báo cáo khoa học: The crystal structure of annexin Gh1 from Gossypium hirsutum reveals an unusual S3 cluster Implications for cellulose synthase complex formation and oxidative stress response potx
... fascinating perspective for plant annexin function, since it might well represent the structural basis of the role of annexins in the oxidative stress response Oxy5, an annexin-like protein from Arabidopsis, ... metazoan annexin proteins As structurally established for annexin A5 [16], the canonical type II calcium binding sites are found within the AB loops of each domain and are provided by the endonexin sequence ... previously reported annexin from bell pepper [19] A detailed elucidation of the oligomerization behaviour of plant annexins yielded calcium-independent monomer-trimer equilibria for annexins 23(Ca38),...
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INTERACTIONS OF POLYMERS WITH FIBRILLAR STRUCTURE OF CELLULOSE FIBRES: A NEW APPROACH TO BONDING AND STRENGTH IN PAPER docx
... profuse hydrogen bonding, is manifested by the existence of several polymorphs (crystalline forms) The crystalline forms of cellulose I and I exist in native cellulose at different ratios that ... innovative solutions, whether new chemical additives, novel process design, or optimization of existing methods in paper manufacture Traditionally, paper strength additives have been divided by ... (S1, S2, S3) The primary wall is rich in hemicelluloses, pectin, and lignin The bulk of cellulose exists in the secondary cell wall layers, especially in the thick S2 layer Besides thickness, the...
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Báo cáo khoa học: Polysaccharide binding sites in hyaluronate lyase – crystal structures of native phage–encoded hyaluronate lyase and its complexes with ascorbic acid and lactose docx
... the human connective tissue, thereby allowing dissemination of the phage-encoded erythrogenic toxin, which is responsible at least in part for the visible rash in scarlet fever [8] The crystal ... residue 108 This is followed by the central core consisting of 16 antiparallel b-strands with flexible loops between strands This generates an irregular 3394 Fig The difference Fourier (jFo À Fc ... (TSbH), similar to that reported in HylP1 [5] This region extends over residues 109–309 and is approxi˚ mately 80 A in length It is separated by a sharp loop (residues 310–319) from the a-helical...
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Báo cáo khoa học: NMR study of cellulose and wheat straw degradation by Ruminococcus albus 20 pdf
... of the extracellular medium Figure shows that the concentration of these metabolites reached a maximum between 24 and 48 h, and then remained fairly constant The metabolites were not produced at ... liquid-state NMR measurements on a Bruker Avance DSX spectrometer operating at 300 and 500 MHz in mm TXI inverse probes (1H, 13C, 15N) with z-gradients at 27 °C The following techniques were used for...
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Báo cáo hóa học: " Spatial and temporal dynamics of cellulose degradation and biofilm formation by Caldicellulosiruptor obsidiansis and Clostridium thermocellum" ppt
... this, a maximum biofilm thickness can be estimated from the mean intercellular distance (d) calculated from, d= √ ρa (1) And then, the minimum volumetric biofilm cells density can be approximated ... count was determined using a Thoma cell counting chamber (Blaubrand, Wertheim, Germany) and an Axioskop2 Plus microscope (Zeiss, Thornwood, NY, USA) with phase contrast illumination ImageJ software ... indicate that the radius of the colony is larger than its height, with the width at 35 μm but the maximum depth at 10 μm The formation of inverted colonies is likely due to cellulose hydrolysis by...
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Báo cáo hóa học: " Cellulose fibres, nanofibrils and microfibrils: The morphological sequence of MFC components from a plant physiology and fibre technology point of view" pptx
... maximum diameter of a microfibril was proposed to be 35 Figure Microfibril of Pinus radiata Image acquired with TEM The black arrow indicates the boundaries of a microfibril, which is approximately ... and strong gels Biomacromolecules 2007, 8(6):1934-1941 Saito T, Nishiyama Y, Putaux JL, Vignon M, Isogai A: Homogeneous Suspensions of Individualized Microfibrils from TEMPO-Catalyzed Oxidation ... the plasma membrane, exocytosis of cell wall polymers and cortical microtubules [21] It seems to exist sufficient evidences that elementary fibrils in vascular plant cell walls are composed of 36...
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Báo cáo hóa học: " Aqueous-Phase Synthesis of Silver Nanodiscs and Nanorods in Methyl Cellulose Matrix: Photophysical Study and Simulation of UV–Vis Extinction Spectra Using DDA Method" docx
... spherical particles have strong SPR band at *400 nm, while Ag nanorods usually show a red-shifted long-axis resonance (longitudinal plasmon band) and a slightly blueshifted short-axis resonance (transverse ... intensity is much stronger than that was theoretically expected [46] Since spherical silver particles may also have their absorption band in this region, it suggests the existence of few spherical ... perpendicular to the optic axis of the nanorod Two orthogonal polarizations of incident light are being considered in the calculation, one with an electric field parallel to the optic axis and another that...
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Project Gutenberg''''s Researches on Cellulose, by C. F. Cross and E. J. Bevan pptx
... reference to starch, 'the subject is still enshrouded in mystery.' This 'material' complexity is at its maximum with the most complex members of the series, which are the celluloses, and we think ... known to us and is defined by the negative characteristics of resistance to hydrolytic actions and oxidations These are dealt with in the order of their intensity Next we have the more positive definition ... interesting matter The purpose of the author's elaborate comparative study is to decide which has the strongest claims to be regarded as the 'standard' method They appear to have a preference for the...
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báo cáo khoa học: " Habituation to thaxtomin A in hybrid poplar cell suspensions provides enhanced and durable resistance to inhibitors of cellulose synthesis" potx
... adaptation during hypoxia Plant Physiol 2009, 149:461-473 63 Takahama U: Oxidation of vacuolar and apoplastic phenolic substrates by peroxidase: Physiological significance of the oxidation reactions ... Therefore, it is unlikely that resistance to TA is simply due to a detoxification mechanism that would transform TA to less toxic metabolites, as it was reported in the presence of the fungus Aspergillus ... are bound by hemicelluloses to form a network embedded in a matrix of pectins [15] This strong but flexible arrangement of complex polysaccharides is important not only for the control of plant...
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báo cáo khoa học: " The cellulose synthase superfamily in fully sequenced plants and algae" pps
... 100/100 99/98 Cs lG 100/100 lJ Cs 0.2 0.1 CslE Green algae Figure The maximum likelihood (ML) phylogenies of the Csl families The maximum likelihood (ML) phylogenies of the Csl families a) 217 plant ... and the conserved Pfam domains (see Methods for details) Figures 1A and 1B show the un-rooted maximum likelihood (ML) trees for the Cellulose_synt dataset and the GT2 dataset, respectively The ... side by side, showing the minimum, the 25% percentile, the median, the 75% percentile and the maximum values of Ka/Ks The boxes are drawn with widths proportional to the square-roots of the number...
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Báo cáo khoa học: "In vivo and in vitro evaluation of an Acetobacter xylinum synthesized microbial cellulose membrane intended for guided tissue repair" ppt
... Brazilian Health Agency – ANVISA (register number 80255120001) The membrane is semi-transparent, flexible, hydrophilic, selective permeable, pH 6.0–7.0, 0.05 mm thick, and gamma radiation-sterilized ... materials have been used to promote guided bone regeneration or guided tissue regeneration in maxillofacial bone defects, cranial defects, and periodontal bone defects [5-8] The same biological ... preparation of the samples was needed Tissue reaction evaluation Twenty-five male Swiss Albino mice, approximately month old and weighing 25 g were used The animals were randomly divided into five groups...
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Chlorine free extraction of cellulose from rice husk and whisker isolation
... Sul/RS, Brazil) Hexane (Fmaia, Brazil), ethanol (Fmaia, Brazil), sodium hydroxide (Labsynth, Brazil), hydrogen peroxide (CAQ Química, Brazil), nitric acid (Fmaia, Brazil), acetic acid (CAQ Química, ... dispersed by an ultrasonic treatment (Ultrasonic equipment Thornton, Model USC-1400) Although the strong nitric and sulfuric acids were used in the overall procedure, the effluents turned to be dilute ... The specimens were negatively stained with 2% uranyl acetate and observed using a JEOL JEM 1200FxII electron microscope operating at 80 kV The whisker dimensions were determined with the aid of...
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Adsorption behavior and inhibition corrosion effect of sodium carboxymethyl cellulose on mild steel in acidic medium
... differential capacitance, the frequency at which the imaginary component of the impedance is maximum, (−Z''max) was Table Impedance and LPR parameters for corrosion of mild steel in 1.0 mol·L−1 ... inhibitor molecules on the metal surface, which forms a coordinate type of bond that explains the strong adsorption of Na-CMC on the mild steel surface Similar interpretations about the adsorption ... the Na-CMC as a corrosion inhibitor depends primarily on sufficient surface coverage with the strongly adsorbed Na-CMC: this polymer contains active hydroxyl groups that could be bridged with...
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Thermochemical conversion of biomass acid catalysed pathways and kinetics of cellulose pyrolysis
... can easily fit into existing liquid fuel logistics and distribution networks However they face a severe limitation due to the transportation cost of the solid biomass A maximum distance which ... gaseous products of biomass depolymerisation would typically consist mainly of carbon monoxide, carbon dioxide, hydrogen, methane and small amounts of other short chain (C2 – C4) hydrocarbons Meanwhile ... (i.e ion-exchange resins, metal oxides, clay and zeolites) were used to convert glucose in polar, aprotic solvents (e.g dimethylformamide - DMF, dimethyl sulfoxide - DMSO) [89] Among the solid...
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Interface studies for microcrystalline silicon thin film solar cells deposited on TCO coated planar and textured glass superstrates
... v Table of Contents vii List of Figures xiv List of Symbols xxiv List of Nomenclature xxv List of publications arising from this ... thickness L (i.e µm and µm) to generate a short-circuit current of 24 mA/cm2 82 xi Table 5.3 Comparison of the most important electrical parameters for the different buffer layers ... used in this study (obtained from 20×20 µm2 AFM and XTEM images, respectively) 139 xii Table 6.3 One-sun I-V parameters of the best µc-Si:H solar cells processed on the three investigated...
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IONIC LIQUIDS FOR CELLULOSE PROCESSING AND CARBON CAPTURE FROM FIRST PRINCIPLES CALCULATIONS TO ATOMISTIC SIMULATIONS
... polarity Toxicity: Although ILs are regarded as new type of solvents within green chemistry community Some studies have explored the cytoplasmic toxicity of ILs It is revealed that the toxicity of ... N,N-dimethylacetamide/lithium chloride, N,N-dimethylformamide/nitrogen tetroxide, N-methylmorpholine-Noxide, dimethylsulfoxide/tetrabutylammonium fluride trihydrate could be used for cellulose dissolution, ... Petkovic et al have studied environmental acceptability of ILs considering their toxicities.7 Because of approximately 1018 cation-anion combinations, it is impossible to experimentally investigate...
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Functional cellulose derivatives and their applications in food and pharmaceutical products
... help classify the sample into either dilute solutions, entangled solutions, strong gels or weak gels In the case of strong gels or true gels, where molecular rearrangements within the network are ... and exiting beam are always specified with respect to the surface plane, while they are related to the surface normal in optics The 14 2θ scan can also be understood as a variation of the exit ... scanning interferometry with the maximum measurable topography being 1mm The PSI mode, based on optical phaseshifting, is dedicated to roughness measurements with maximum measurable topography being...
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