chemical reactions of polycyclic aromatic hydrocarbon epoxides

Ngày tải lên: 13/11/2014, 16:04

... characterize the source of hydrocarbon contamination 10.2 PAHs The occurrence of one or more of any of the 16 PAHs of food safety concern is indicated by the presence of transition ions (quantifier ... to these offices, Thermo Fisher Scientific maintains a network of representative organizations throughout the world Figure 5: Comparison of hydrocarbon distribution of different type of oils showing ... matched against that of crude oil sample from the Gulf of Mexico The composition of crude oil from the Gulf of Mexico is given in Table indicating relatively high levels of n-hexadecane, n-heptadecane...

Ngày tải lên: 09/09/2015, 09:38

... phytotoxicity and polycyclic aromatic hydrocarbon contamination in Salicornia fragilis Sci Total Environ 2007, 381:146-156 Oros DR, Ross JRM, Spies RB, Mumley T: Polycyclic aromatic hydrocarbon (PAH) ... higher plants exposed to polycyclic aromatic hydrocarbons and their N-heterocyclic derivatives Environ Toxicol Chem 2006, 25:3238-3245 Burritt DJ: The polycyclic aromatic hydrocarbon phenanthrene ... well as the suggested follow-on research, will be of great value in breeding and engineering plants for phytoremediation of polycyclic aromatic hydrocarbons Conclusions The microarray experiments...

Ngày tải lên: 12/08/2014, 03:21

Ngày tải lên: 13/11/2014, 15:58

... Biodegradation aspects of Polycyclic Aromatic Hydrocarbons (PAHs): A review, Journal of Hazardous Materials 169 (2009) 1-15 Bach Quang Dung, Enhancement of intrinsic bioremendiation of PAHs-contaminated ... aromatic hydrocarbon (PAH) content of archived sewage sludges Chemosphere 20 (1990) 703-716 F Busetti, A Heitz, M Cuomo, S Badoer, P Traverso, Determination of sixteen polycyclic aromatic hydrocarbons ... analysis of polycyclic aromatic hydrocarbons in sewage sludge from wastewater treatment plants, Journal of Chromatography A 938 (2001) 57-65 S.R Wild, S.P McGrath, K.C Jones, The polynuclear aromatic...

Ngày tải lên: 24/06/2015, 08:16

... EESI-MS is able to track the chemical dynamics of simple reactions (e.g elementary reactions) and complicated chemical reactions (e.g heterogeneous chemical reaction, and reactions involving catalysts) ... monitoring of trace amounts of chemicals We have extended the application of EESI to instantly follow organic chemical reactions in a straightforward manner, with a rather simple setup Two important chemical ... Monitoring of organic chemical reactions using EESI-MS Figure Mass spectra of the Michael addition reaction recorded at 20, 60 and 300 min, respectively Inserts: molecular structures of PEA, PEAP...

Ngày tải lên: 14/02/2014, 08:20

... reaction with the alkyne, at a range of concentrations, in the presence of NADH (100 lm) The decay of enzyme activity as a function of 2667 Adventitious reactions of alkene monooxygenase time was ... activity was measured as a function of the time between the start of the reaction (addition of NADH) and removal of the alkyne by flushing with nitrogen First-order decay of enzyme activity was observed, ... underestimated The positive deviation of the latest data points from the extrapolated linear 2663 Adventitious reactions of alkene monooxygenase Fig Kinetics of inactivation of AMO by (A) propyne and (B)...

Ngày tải lên: 16/03/2014, 19:20

... the effect of a mechanical force on the kinetics of chemical reactions A recent review by Beyer and Clausen-Schaumann describes the role of mechanical forces in catalyzing chemical reactions. [48] ... effects of D2O on the dynamics of protein folding.[36] Knowledge of the influence of D2O on the conformational dynamics of a protein may be important both at a basic level, to identify the nature of ... measurement of the influence of D2O on the hydrophobic effect during protein folding 2.7 The Force Dependency of Chemical Reactions Figure Force quench experiments reveal the folding trajectory of a...

Ngày tải lên: 22/03/2014, 18:20

... Chapter - INTRODUCTION CHEMICAL REACTORS T he chemical reactor is the heart of any chemical process Chemical processes turn inexpensive chemicals into valuable ones, and chemical engineers are ... industrial chemicals Table l-3 lists the top 50 chemicals in the country from Chemical and Engineering News and a list of wholesale prices of chemicals in August 1995 taken from a many-page list in Chemical ... what must be the cost of producing ethylene if we want a profit of 10% of sales? (c) The actual process produces about 0.8 moles of ethylene per mole of ethane fed (the yield of the process is 80%)...

Ngày tải lên: 06/07/2014, 15:31

... Chapter - INTRODUCTION CHEMICAL REACTORS T he chemical reactor is the heart of any chemical process Chemical processes turn inexpensive chemicals into valuable ones, and chemical engineers are ... industrial chemicals Table l-3 lists the top 50 chemicals in the country from Chemical and Engineering News and a list of wholesale prices of chemicals in August 1995 taken from a many-page list in Chemical ... what must be the cost of producing ethylene if we want a profit of 10% of sales? (c) The actual process produces about 0.8 moles of ethylene per mole of ethane fed (the yield of the process is 80%)...

Ngày tải lên: 06/07/2014, 15:34

... energy of –760 kJ/mol, white circles indicate unsaturated edge atoms with a carbon binding energy of –635 kJ/mol 79 Figure 4.13 The total energy of cluster as a function of the number of atoms ... Saeys, “Effect of boron on the stability of Ni catalysts during steam methane reforming”, Journal of Catalysis, in press Jing Xu, Mark Saeys “First principles study of the effect of carbon and ... molecular level understanding of the coking mechanism on Ni catalysts, the stability of different forms of carbon that can exist on Ni catalyst and the kinetics of carbon diffusion were studied...

Ngày tải lên: 11/09/2015, 16:06

... analysis of the effect of carbon and boron on the activity of a Ni catalyst is presented in chapter In chapter 6, an experimental validation of the proposed effect of boron on the stability of a ... adsorption of CH4 is the rate-limiting step of the steam reforming process (Besenbacher et al., 1998) The breaking of the C-H bond in the adsorption of CH4 occurs on top of a Ni atom, with a barrier of ... consists of a two-dimensional rectangular cluster of about 10 atoms and 3-5 atom layer thickness with a large vacuum layer on top of it, resulting in a model consisting of an infinite 2D slab of 3-5...

Ngày tải lên: 11/09/2015, 16:06

... EFFECTS OF SURFACTANT ON BIODEGRADATION OF MODEL POLYCYCLIC AROMATIC HYDROCARBONS LI JINGLIANG (M Eng TIANJIN UNIV) A THESIS SUBMITTED FOR THE DEGREE OF DOCTOR OF PHILOSOPHY DEPARTMENT OF CHEMICAL ... of wt% Tergitol 15-S-5 101 5.4 Cloud point of Tergitol 15-S-7 as a function of surfactant concentration 102 5.5 Effect of Inorganic Salts on Cloud Point of wt%Tergitol 15-S-7 104 5.6 Effect of ... of interest There are many factors that can affect the partition of solutes Several authors have studied the effect of various experimental factors on the partition mainly of polar aromatic hydrocarbons...

Ngày tải lên: 16/09/2015, 17:11

... Fig-5.14: DOSs of H-terminated 2×1 surfaces (a) surface B of the 2×1_clean; (b) surface N of the 2×1_clean; (c) surface B of the 2×1_BHNH; (d) surface N of the 2×1_BHNH; (e) surface B of the 2×1_BH; ... 1.4.1 Structure of Cyclacenes Cyclacenes are a class of laterally fused benzoid hydrocarbons They can be thought of as a 1-dimensional sheet of graphite (a hexagonal lattice of carbon) rolled ... properties as a function of number of rings presented in cyclacenes In particular, we were interested in comparing the aromaticity of the two systems The energy gap (HOMO-LUMO), ∆gap, of the benzene cyclacene...

Ngày tải lên: 17/09/2015, 17:18

... (lightness of color) and b* (yellowness of color), with an increase in a* (redness of color) Similar results were also reported by Ganesan et al (2005) Table The Effect of the Rate of Solubles ... color Corn-sorghum blends of DDGS are also somewhat darker in color than corn DDGS because of the bronze color of many sorghum varieties When a relatively high proportion of solubles are added to ... they evaluated color in batches of DDGS where approximately 0, 30, 60 and 100% of the maximum possible of syrup was added to the mash before drying Actual rates of solubles addition to the mash...

Ngày tải lên: 08/08/2012, 10:03

... Precipitations In Chemical Reactions NaNO3 ch t d hòa tan theo qui t c hòa tan (t t c mu i nitrat Pb+2 + 2Cl- PbCl2 (ch ... k t t a s b n t th c hành Co(C2H3O2)2 + LiOH t t a ph n ng hóa h c Trang Precipitations In Chemical Reactions oán s k t t a d a vào n ng c a ion Trong bi u th c c a Ksp v ph i tích n ng c a ion ... [C2O4-2] = (2.5 x 10-3) ( x 10-8) = 2.5 x 10-11 t t a ph n ng hóa h c Trang Precipitations In Chemical Reactions So sánh k t qu tìm c v i Ksp a k t lu n Tích n ng c a ion (2.5 x 10-11) nh h n Ksp...

Ngày tải lên: 22/08/2012, 09:18

... their knowledge of the identities and quantities of pollutants and other chemical species in water, air, soil, and biological systems Therefore, proven, state -of- the-art techniques of chemical analysis, ... 24 CHEMICAL ANALYSIS OF WATER AND WASTEWATER 24.1 GENERAL ASPECTS OF ENVIRONMENTAL CHEMICAL ANALYSIS Scientists’ understanding of the environment can only ... period in the evolution of analytical chemistry, characterized by the development of new and improved analysis techniques that enable detection of much lower levels of chemical species and a vastly...

Ngày tải lên: 23/07/2013, 20:57

... member of American Oil Chemist Soceity and Institute of Food Technology She is a current Ph.D candidate Yaser Dahman holds a Ph.D in Chemical and Biochemical Engineering from the University of Western ... care industry, mainly in the field of developing and testing of novel wound dressing materials for chronic wounds He is currently a professor in the Department of Chemical Engineering at Ryerson ... reesei with the enzyme activity of 700 IU/g, and Novozyme 188 is composed of Cellobiase from Aspergillus niger with the enzyme activity of 250 IU/g The effect of temperature was examined where...

Ngày tải lên: 05/09/2013, 15:28

... Precipitations In Chemical Reactions NaNO3 ch t d hòa tan theo qui t c hòa tan (t t c mu i nitrat Pb+2 + 2Cl- PbCl2 (ch ... k t t a s b n t th c hành Co(C2H3O2)2 + LiOH t t a ph n ng hóa h c Trang Precipitations In Chemical Reactions oán s k t t a d a vào n ng c a ion Trong bi u th c c a Ksp v ph i tích n ng c a ion ... [C2O4-2] = (2.5 x 10-3) ( x 10-8) = 2.5 x 10-11 t t a ph n ng hóa h c Trang Precipitations In Chemical Reactions So sánh k t qu tìm c v i Ksp a k t lu n Tích n ng c a ion (2.5 x 10-11) nh h n Ksp...

Ngày tải lên: 24/01/2014, 05:20

... discussion The essential oil was light yellow and the total yield of 1.23% The chemical composition of the leaf essential oils of investigated species collected in October 1991 and 2007 were not ... oil of investigated species from Vietnam was characterized by large amount of α- and βphellandrene (70.7%) and the ratio of αphellandrene and β-phellandrene was 5.73 Table The composition of leaf ... research from the Ministry of Science and Technology of Vietnam, code 50 63 06 References [1] N.X Dung, P.V Khien, Essential oils of wood, root, flower, and fruit of camphor tree, Pharmaceutical...

Ngày tải lên: 12/02/2014, 17:20