degradation mechanisms of condensation polymers polyesters and polyamides
ISOTOPE HYDROGRAPH SEPARATION FOR MODELING OF RUNOFF MECHANISMS OF ATMOSPHERICALLY DERIVED CHEMICAL AND RADIOACTIVE POLLUTANTS
Ngày tải lên :
05/09/2013, 09:08
... composition of 2H and 18O The compositions of the isotopes 2H (D) and 18O were analyzed to obtain δD (‰) and δ18O (‰), respectively, which are defined as the relative deviation of the parts per thousand ... 22-23 of 2003 The amount of precipitation was 30 mm in total Figure shows the precipitation record of the studied event (Fig 2a) and the record of the river flow rate (solid line, Fig 2b) of the ... the discharge of new water and the migration of hazardous elements, which has not been sufficiently analyzed or reported previously As a result of the calculation, and by setting C1 and C2 as mentioned...
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Báo cáo khoa học: Modeling hydration mechanisms of enzymes in nonpolar and polar organic solvents potx
Ngày tải lên :
16/03/2014, 10:20
... precise picture of water at the surface of the protein, we looked at the number of water molecules within a specific layer of 0.25 nm from the surface of the protein (Fig 3), and the ratio of Fig Average ... 2431 ˆ N M Micaelo and C M Soares Modeling hydration mechanisms of enzymes of time Final parameters and standard errors are shown in supplementary Table S2 The residence times of the water molecules ... significant role in solvating the enzyme, and also takes part in the modulation of the structural and dynamic properties of the enzyme It is also of note that ethanol and acetonitrile are significantly...
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Báo cáo Y học: Cytochrome c from a thermophilic bacterium has provided insights into the mechanisms of protein maturation, folding, and stability potx
Ngày tải lên :
24/03/2014, 03:21
... high pressure NMR, and stopped flow and single–molecule analyses, have been established, and are applicable to the elucidation of the dynamic features of cytochromes c It is of interest to characterize ... that some of them are the residues responsible for stability, and in fact Ala7, Met13, and Tyr43 in HT c-552 have been shown, by mutagenesis and 3D structure analyses, to be determinants of the ... quintuple mutant, and the corresponding ones of the wild-type PA c-551 and HT c-552 are colored purple, green, and red, respectively (A) The region around A7/M13 in HT c-552 and the corresponding...
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Báo cáo hóa học: " Research Article Neural Mechanisms of Motion Detection, Integration, and Segregation: From Biology to Artificial Image Processing Systems" docx
Ngày tải lên :
21/06/2014, 09:20
... modelling of neural mechanisms (functionality) and their interaction is motivated by principle findings of electrophysiology, anatomical studies, and theories of information processing of macaque ... flow of information via feedforward and feedback connections The mechanisms of this feedforward and feedback processing between model areas V1 and MT can be described by a unified architecture of ... two random dot kinematograms (the sequence shows 60 moving dots and consists of 60 frames with 40 × 40 px/frame) Random dots are initialized at random positions and a horizontal velocity of px/frame...
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Mechanisms of polymer ca2+ interaction and their effects on the characteristics of alginate microspheres and films 3
Ngày tải lên :
14/09/2015, 17:43
... prominence of bands between 1680-1670 cm-1 and 1417-1426 cm-1 were associated with asymmetric and symmetric COOstretching vibrations of the carboxyl groups and they provided strong evidence of cation-carboxyl ... the hydrophilic groups of carrageenan and carboxyl groups of alginate as reflected by the low apparent solubility and lower extent of water uptake of the crosslinked AK and AI films The hydrophilic ... withstand stress and handling Miscibility between the polymers is essential to achieve the desirable mechanical properties of a resultant film The tensile strength and elastic modulus of the films...
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Mechanisms of polymer ca2+ interaction and their effects on the characteristics of alginate microspheres and films 2
Ngày tải lên :
14/09/2015, 17:44
... In spite of this, the rate of drug release from S2 and S3 microspheres was found to be comparable with that of SA and S1 microspheres The t75% values of SA and S1 microspheres were 17.1 and 22.9 ... attributed to less effective dispersion of the more viscous S3 mixture into globules as small as those of SA and S1 solutions A comparison of drug content and mean size of the microspheres suggested that ... respectively and 14.3 for 100 (a) (c) (b) (d) 101 Figure 13 Photographs of (a) SA (b) S1 (c) S2 and (d) S3 microspheres 101 both S2 and S3 microspheres (Table 13) This showed that the matrix of the S2 and...
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Mechanisms of polymer ca2+ interaction and their effects on the characteristics of alginate microspheres and films 1
Ngày tải lên :
14/09/2015, 17:45
... and after cross-linking would give a more accurate picture of the influence of crosslinking for each type of sodium alginate used In this study, the tensile strength and the elastic modulus of ... polymer chains composed of a higher proportion of M and MG blocks were more flexible and exhibited a higher degree of mobility during cross-linking This permitted the alignment of the chains to form ... viscosities in the range of 308-390 mPa.s and produced comparable extent of microsphere aggregation The difference in the degree of agglomeration of the yield among between NI, FL and MA microspheres...
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Modeling and Simulation of Microbial Depolymerization Processes of Xenobiotic Polymers
Ngày tải lên :
25/10/2013, 08:20
... proposed for the enzymatic degradation of PVA was applied to enzymatic degradation of polylactic acid (PLA), and the degradability of PVA and PLA was compared [17] Dependence of degradation rate on ... Modeling and Simulation of Microbial Depolymerization Processes of Xenobiotic Polymers numerically, and the transition of the weight distribution was simulated [9, 10] Dependence of degradation ... distribution of PLA before and after enzymatic degradation Residual amounts of PLA after incubation for and 67 h were 40% and 27%, respectively [17, 18] 301 12 Modeling and Simulation of Microbial...
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Tài liệu Báo cáo khoa học: Mechanisms of obesity and related pathologies: Androgen deficiency and endothelial dysfunction may be the link between obesity and erectile dysfunction pptx
Ngày tải lên :
18/02/2014, 06:20
... pathophysiological mechanisms of obesity-induced androgen deficiency and hypogonadism-induced obesity remain the subject of intense investigation Several hypotheses have discussed the relationship of androgen ... endothelium dysfunction and ED [130,131], the concept of androgen deficiency reinforces the important role of androgens in vascular health and erectile function Summary and conclusions Visceral ... visceral and peripheral fat further diminishes the levels of testosterone and increases the levels of estradiol (E2), which further contributes to preferential deposition of more visceral fat and...
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Tài liệu Báo cáo khoa học: Models and mechanisms of O-O bond activation by cytochrome P450 A critical assessment of the potential role of multiple active intermediates in oxidative catalysis doc
Ngày tải lên :
19/02/2014, 16:20
... lifetimes of carbon-centred radicals derived from a diverse set of substrates are on the order of about 10)10 s [98] Moreover, the randomness of the apparent intramolecular KIEs for unrearranged and ... result in a drastic diminution of polymerization products derived from aniline and some of its p- and N-substituted congeners, while formation of p-hydroxylated and dealkylated metabolites was ... discounted in view of the high selectivity of DNA strand breakage [239] Also, density functional theory (DFT) calculations of the electronic structure of an optimized geometric model of activated BLM...
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Báo cáo khoa học: Mechanisms of accumulation of arachidonate in phosphatidylinositol in yellowtail A comparative study of acylation systems of phospholipids in rat and the fish species Seriola quinqueradiata pot
Ngày tải lên :
08/03/2014, 08:20
... species composition of PtdIns Fatty acid composition of phospholipids from tissues of yellowtail and rat Brain, heart, liver, spleen, kidney and ovary of yellowtails were isolated, and total lipids ... Protein kinase C activity in the spleen of trout (Salmo gairdneri) and the rectal gland of dogfish (Scyliorhinus canicula), and the effects of phosphatidylserine and diacylglycerol containing (n-3) ... phosphatidylserine (PtdSer), PtdIns and sphingomyelin The fatty acid compositions of PtdCho, PtdEtn, PtdSer and PtdIns of brain, heart, spleen, kidney and ovary of yellowtail were investigated (Tables...
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Mechanical properties of solid polymers Constitutive modelling of long and short term behaviour pptx
Ngày tải lên :
09/03/2014, 00:20
... study of polymers III Technique of mechanical tests of vulcanizates of rubber and plastics Rubber Chem Tech., 13, 904–917 Haward, R.N (1942) Extension and rupture of cellulose acetate and celluloid ... in the range of temperatures and strain rates of interest A linear dependence of yield stress as a function of log strain rate can be observed over a large interval of strain rates and temperatures, ... contributions of the various relaxation mechanisms in the material, including time dependence, and temperature and stress dependence Not only the momentary values of temperature and stress are...
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Báo cáo khóa học: Endoplasmic reticulum-associated degradation of glycoproteins bearing Man5GlcNAc2 and Man9GlcNAc2 species in the MI8-5 CHO cell line docx
Ngày tải lên :
16/03/2014, 16:20
... (A, B, C and D) and glycoproteins (E, F, G and H) were analyzed by HPLC as described in Experimental procedures (D) and (H) correspond to the pattern of oligomannosides bound to LLO and glycoproteins, ... fraction Most of the evidence for the occurrence of degradation signals involved in ERAD has been obtained by studying the effect of inhibitors of demannosylation (kifunensine and deoxymannojirimycine) ... the presence of kifunensine, an inhibitor of the demannosylation process Figure 1D,H shows that incubation in the presence of 20 lM kifunensine did not affect the proportion of Man5 and Man9 species...
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Báo cáo khoa học: Mechanisms of amyloid fibril self-assembly and inhibition Model short peptides as a key research tool pptx
Ngày tải lên :
23/03/2014, 11:20
... century because of a gradual increase in life expectancy The genuine understanding of the mechanisms leading to the formation of amyloid fibrils and its inhibition is therefore of high clinical ... presence of aromatic residues in specific structural contexts can accelerate this process by several orders of magnitude Therefore, from the practical point of view, understanding of the mechanism of ... one of the key parameters for predicting the rate of the fibrillization process [36] Molecular dynamics simulations of the stability of preformed amyloid fibrils clearly demonstrated the role of...
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Báo cáo khoa học: ERK and cell death: Mechanisms of ERK-induced cell death – apoptosis, autophagy and senescence doc
Ngày tải lên :
29/03/2014, 08:20
... of autophagy, such as induction of LC3 and conversion of LC3-I to LC3-II [48,49,118], induction of beclin [48], induction of BNIP-3 [66] and activation of G-interacting protein (GAIP) by phosphorylation ... 2009 FEBS S Cagnol and J.-C Chambard ERK and cell death establishment of senescence induced by a constitutively active form of Ras or MEK [121] process is often prevented by use of MEK inhibitors ... by inducible activation of Raf1:ER, it correlates with inhibition of AKT and dephosphorylation of Mdm2, which lead to p53 accumulation and growth arrest [97] In the case of human BJ foreskin primary...
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Báo cáo khoa học: Mechanisms of obesity and related pathologies: Role of apolipoprotein E in the development of obesity potx
Ngày tải lên :
29/03/2014, 22:21
... intake and energy expenditure, and the subsequent deposition of excess fatty acids into fat cells in the form of triglycerides, leads to the development of obesity [21] A lipid-rich diet and sedentary ... Epidemiological and population studies have established a direct correlation between obesity and the development of cardiovascular disease [36,37] Despite the pivotal role of obesity and dyslipidemia ... condition, and an increased propensity to develop a variety of spontaneous and induced tumors [44] The Ay mutation is the result of a 170 bp deletion that removes all but the promoter and noncoding...
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Báo cáo khoa học: Mechanisms of obesity and related pathologies: Transcriptional control of adipose tissue development pdf
Ngày tải lên :
29/03/2014, 22:21
... contain smaller lipid droplets and more mitochondria, and express higher levels of UCP-1 and PGC-1a and lower levels of Rb The role of these various transcription factors and nuclear factors is highlighted ... for our understanding of what controls the expansion of fat mass in different individuals Moreover, it is also important to understand the origins of each of the different white and brown depots ... adipocyte number) and hypertrophy (i.e an expansion of adipocyte volume as a result of the accumulation of lipids) Consequently, knowledge of the origin and molecular control of adipocyte progenitor...
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Báo cáo khoa học: Mechanisms of obesity and related pathologies: The macro- and microcirculation of adipose tissue pdf
Ngày tải lên :
29/03/2014, 22:21
... and leptin, the inflammatory chemokines tumor necrosis factor-a (TNFa) and an array of interleukins, and angiogenic and vasoactive molecules such as vascular endothelial growth factor (VEGF) and ... adipocytes and the adipose microvascualture, and the marked similarities in tumor growth and hypoxia compared with those of adipose tissue expansion remain of great interest Adipose tissue and lymphatic ... Peripheral lymphatic management, uptake and transport of adipocyte secretions and reverse transport of lipids and lipophyllic molecules from the interstitium is therefore of great importance not only to...
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Báo cáo khoa học: Reaction mechanisms of thiamin diphosphate enzymes: defining states of ionization and tautomerization of the cofactor at individual steps docx
Ngày tải lên :
29/03/2014, 23:20
... chemical shifts of the three species on the left hand side of Schemes and 2, the two neutral and one positively charged forms of the Table Assignment of the state of tautomerization of ThDP during ... basis of the accumulated understanding of enzyme mechanisms, such proton transfers are likely to be mediated by general acid ⁄ base catalysts, such as His, Asp and Glu, and perhaps Cys, Lys and ... bands corresponding to the AP and IP forms have different phases enables the simultaneous observation of the two tautomeric forms, notwithstanding the proximity of the bands to each other, and...
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Báo cáo khoa học: Determination of the metal ion dependence and substrate specificity of a hydratase involved in the degradation pathway of biphenyl/chlorobiphenyl pot
Ngày tải lên :
30/03/2014, 15:20
... Characterization of BphH measured the dissociation constants of Mg2+ and Mn2+ and the influence of each metal cofactor on the kinetic parameters for HPDA hydration We also generate and test the specificity of ... dependence of the enzyme activity and the kinetic constants of HPDA hydration for each enzyme, using the respective optimum metal ion cofactor, are similar For example, the Km value of 41 lm and kcat of ... range of aromatic pollutants reaction contain 10 ng of template pDD5301 [10], 0.8 units of Pfx polymerase (Invitrogen), 20 nm amounts of each dNTP and 100 pmol of each primer in a total volume of...
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