the oxidation of methane

... structure of about m height The surface of the structure consists of grayblack microbial mat; the interior of the massive mat is pink The greenish-gray inner part of the structure consists of porous ... archaea of the ANME-2 cluster prevail (3) The most abundant bacterial population in the mats from the Black Sea belongs to the Desulfosarcina/Desulfococcus group, the same taxon of SRB as found in the ... conventional cultures of SRB must be expected for the Black Sea mats Consequently, the amount of methane oxidized for the buildup and maintenance of the existing mat structures should exceed their organic...

Ngày tải lên: 12/06/2014, 11:18

... successively the influence of residual chloride ions on the catalytic activity, the kinetic aspects of the oxidation of methane over these catalysts, the nature of the active sites, the influence of the ... The influence of the acid strength of the support on the catalytic properties of Pd catalysts in the oxidation of methane was not addressed A recent study concerns the oxidation of propane over ... nitrogen and the catalytic activity, the higher the 1435 cm−1 intensity the lower the rate of methane oxidation Tentative regeneration of the catalyst in hydrogen led to the decomposition of sulphate...

Ngày tải lên: 08/10/2015, 22:56

... effect of temperature on the catalytic activity of the catalysts The conversion values were taken after 1h of reaction at each temperature The catalytic activity of the catalysts increased with ... of lattice due to the replacement of Ce+4 (1.09Å) with a smaller cation Fig H2 and CO selectivities during partial oxidation of methane for Ni/CeO2 catalyst (CH4/O2=2) International Journal of ... Direct partial oxidation of methane to synthesis gas by cerium oxide J Catal.; 175:152-160 1998 B Irigoyen, N Castellani, and A Juan, Methane oxidation reactions on MoO3 (100): A theoretical study...

Ngày tải lên: 30/10/2016, 18:39

... nano sizes was dispersed inside the pore of support material (a) 3.3 Catalytic activities of Pt/SBA-15 in the oxidation of D-glucose The results of the oxidation of D-glucose carried out on Pt/SBA-15 ... showed the highest activity and selectivity in the oxidation of glucose When increasing the content of Pt loading, most Pt nanoparticles aggregated outside the channels of SBA-15 with size of 10-15nm ... apparatuses, respectively 2.3 Oxidation procedure of D-Glucose The reaction was carried out in liquid phase with the presence of oxygen in air, at the range of temperature 50-900C The pH value was maintained...

Ngày tải lên: 05/03/2014, 11:21

... spectroscopic properties of the product of NADP+ oxidation Fig Hypothetical mechanism of the reductive half-reaction of the catalytic cycle of FprA in the oxidation of NADP+ to yield NADPO The reaction scheme ... exclude the formation of the species modified in position of the nicotinamide ring because of the poor reactivity of this position towards nucleophilic attack Indeed, the positive charge of the pyridinium ... evidence of the ability of FprA to catalyze the production of NADPO In the present article, we provide the first quantitative description of this reaction, along with a detailed analysis of the spectroscopic...

Ngày tải lên: 16/03/2014, 11:20

... about the thermodynamics and kinetics of the binding of guanidines and N-hydroxyguanidines to iNOS Removal of the a-amino or a-carboxylate moiety of l-Arg has important effects on the ability of the ... oxidation of the N-hydroxyguanidines varied by less than a factor 2, whereas the kcat value for the production of NO from the oxidation of the guanidines varied a great deal from to 100% of the kcat ... the kcat of production of NO from oxidation of these guanidines corresponds well to the order NOHA > TFBNOHG > BuNOHG found for ⁄ koff app of the corresponding N-hydroxyguanidines (Table 3) These...

Ngày tải lên: 16/03/2014, 22:20

... electrochemical method to drive the oxidation of methane by two components of the sMMO complex (MMOH and MMOB) in the absence of reductant (NADH or NADPH) and MMOR As in the natural sMMO reaction [11], ... oxygen /methane atmosphere was maintained Detection of the products of substrate oxygenation by the adsorbed MMOH was achieved by holding the potential at )0.5 V for 30 in the presence of substrate ... indicated the reducibility of the binuclear iron centre and its reoxidation by dissolved oxygen (Fig 1) The reduction current peak intensities varied linearly with the square root of the scan...

Ngày tải lên: 17/03/2014, 09:20

... mutant to the wild-type phenotype [32] Therefore, the function of the PAS domains of these proteins in quinone sensing remains obscure It is interesting to note that the PAS domain of the phosphorelay ... addition of Dt 10 20 30 40 50 time (min) Fig Dependence of the kinase activity of BvgS on the redox state of ubiquinone-0 (Q-0) BvgS was incubated with [c-32P]ATP in the presence of mM Q-0 for 4.5 Then ... affected by the presence of the quinone RESULTS Effect of quinones on the activity of BvgS and EvgS In the genus Bordetella, ubiquinone-8 (Q-8) is the predominant quinone [27], whereas the major...

Ngày tải lên: 17/03/2014, 23:20

... of the protein to 6.0 [19] In the early stages of the oxidation process (2–9 h, Fig 3) the exposure of HbTbCO to air leads to the formation of the deoxy form, as suggested by the appearance of ... example, the entire oxidation process of HbTb at pH 7.6 is reported in Fig The spectrum of the oxy form is reported for comparison The spectrum of the CO complex is characterized by the presence of ... belongs to the family Bathydraconidae A comparative analysis of the sequences of these AFHbs reveals the occurrence of substitutions in important regions of the protein, e.g the heme pocket and the...

Ngày tải lên: 23/03/2014, 12:20

... CHEMSTATION software The rate of phenol red oxidation is expressed as the initial rate of depletion of the absorption at the wavelength followed (e.g DA420Æ min)1), in keeping with the literature [9] The ... investigated the kinetics of oxidation of phenol red by Poliporus pinsitus laccase in the absence of any mediator, and then evaluated the ability of phenol red to act as a laccase mediator in the oxidation ... This is a result of the delocalization of the negative charge of the anion onto the adjacent quinoid ring (see Fig 2) Analogously, delocalization of the unpaired electron of the corresponding...

Ngày tải lên: 23/03/2014, 21:20

... in the observed rapid inactivation of sMMO when the copper concentration of the medium was increased, in advance of the induction of the copper-dependent pMMO via the copper switch However, the ... destabilization or reorganization of the secondary structure of the truncated forms was unlikely to be the cause of their destabilization of the truncates because the far-UV CD spectra for truncates ... capsulatus (Bath) in the presence of the hydroxylase indicated that the structured core region of protein B interacted with the hydroxylase but gave no indication of the involvement of the N-terminus...

Ngày tải lên: 31/03/2014, 09:20

... investigation, when the value of [N2] is noticeably greater than the value of [CH4], the value of kN has no practical effect on time evolution of the methane 168 Savinov et al Fig The time on stream of N2 ... no noticeable effect on the rate of decomposition Thus the results of the numerical modeling supported the validity of the estimations which were made on the basis of the simplified consideration ... Hence the process of HCN synthesis was induced which was limited by the value of kN The values of kHCN and kN affected only the concentration of NH, but have no noticeable effect on the rate of...

Ngày tải lên: 09/05/2014, 17:02

... conventional heating increased the yield of 5b, ii) in case of the oxidation of 4, the assistance of microwave or ultrasound increased the formation of 1a by cleavage of a methyl group, and iii) ... 3:12:48 Molar ratio of diphenylmethane:KMnO4:CuSO4 5H2O Fig Influences of the molar ratio diphenylmethane (3):KMnO4:CuSO4 5H2O on the efficiency of the oxidation of diphenylmethane under solvent-free ... 9-Fluorenone (8a) Fig Structure of substrates and products in the oxidation of alkylarenes 2.RESULTS AND DISCUSSION The stoichiometric factor investigated on the oxidation of diphenylmethane in two methods...

Ngày tải lên: 22/07/2014, 03:20

... changes in the morphology and physiology of different organs and tissues One of the theories that tries to explain the exercise effects defends that it may be in part due to the accumulation of oxidative ... and intensity of exercise On the other hand, Methyl Sulphonyl Methane, better known as MSM, is a naturally occurring sulphur compound that MSM may plays a role in the synthesis of glutathione ... exercise, thus augmenting the amount of oxidative damage induced to lipids, proteins and DNA [1,2,22,23] The control of ROS is important to the athlete because they interfere with the rebuilding process...

Ngày tải lên: 12/08/2014, 18:22

... simplified by the addition of data available from pre-genomic analyses [7-9,21] and from the initial analysis of the genome of M extorquens [18] As expected, all the genes encoding enzymes of the RuMP ... (7% of the total extracted protein), suggesting that it has an important role in anaerobic methane oxidation The protein contains a variant of F430, a cofactor used by the classical MCR, but the ... involved in the initial step of anaerobic methane oxidation; this enzyme is hypothesized to be similar to the bacterial MCR (Figure 1, step 1) A microbial mat in the Black Sea largely consisting of ANME-1-type...

Ngày tải lên: 14/08/2014, 14:21

Ngày tải lên: 14/05/2015, 13:57

... than The results indicated that DNDC is capable of capturing the seasonal patterns as well as the magnitudes of CH4 emissions from the experimental site in the VG-TB river basin Therefore, the ... the coefficient of model efficiency (EF) and the coefficient of model determination (CD) were adopted to assess the “goodness of fit” of model predictions 41 After the tests, the validated DNDC ... of nitrous oxide The flux rate in the field can be calculated from the concentration increase of the respective gas in the different samples [22] The effect of the irrigation regimes for rice on...

Ngày tải lên: 24/10/2016, 15:23

Ngày tải lên: 08/08/2012, 14:19

Ngày tải lên: 08/08/2012, 14:36

Ngày tải lên: 08/08/2012, 14:36