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1.
Influence of Pyrolytic Biochar on Settleability and Denitrification of Activated Sludge Process 下载免费PDF全文
Biochar is a massively produced by-product of biomass pyrolysis to obtain renewable energy and has not been fully used.Incomplete separation of sludge and effluent and insufficient denitrification of sewage are two of main factors that influence the efficiency of activated sludge process.In this work,we proposed a new utilization of biochar and investigated the effect of biochar addition on the performance of settleability and denitrification of activated sludge.Results show that the addition of biochar can improve the settleability of activated sludge by changing the physicochemical characteristics of sludge (e.g.,flocculating ability,zeta-potential,hydrophobicity,and extracellular polymeric substances constituents).Moreover,the dissolved organic carbon released from biochar obtained at lower pyrolysis temperature can improve the nitrate removal efficiency to a certain extent. 相似文献
2.
D. V. Moiseev V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2006,42(10):1308-1310
A method has been developed for the synthesis of 2′-and 4′-aryl-2,3′-biquinolyls based on the reaction of 1′-alkyl-2′-aryl-1′,2′-dihydro-2,3′-biquinolyls
and 1′-alkyl-4′-aryl-1′,4′-dihydro-2,3′-biquinolyls with sulfur in DMF.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 10, pp. 1517–1519, October, 2006. 相似文献
3.
D. V. Moiseev N. V. Demidova V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2006,42(1):60-63
A method has been developed for the one pot synthesis of 1′-alkyl-1′,4′-dihydro-2.3′-biquinolyl-4′-thiones based on the reduction
of 1-alkyl-3-(2-quinolyl)quinolinium halides with sodium borohydride and subsequent thiolation. 1′-Alkyl-1′,4′-dihydro-2,3′-biquinolyl-4′-ones
were obtained in close to quantitative yield by the oxidation of 1′-alkyl-1′, 4′-dihydro-2,3′-biquinolyl-4′-thiones.
For Part 17 see [1].
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 1, pp. 67–70, January, 2006. 相似文献
4.
We have developed a method of synthesis of benzo[5,6]indolizino[2,1-b]quinolinium-13-thiolates and 5,6-dihydrobenzo[5,6]indolizino[1,2-c]quinoline-6-thiones
based on the reaction of the corresponding 1′, 2′-dialkyl-1′,2′-dihydro-2,3′-biquinolines and 1′,4′-dialkyl-1′,4′-dihydro-2,3′-biquinolines
with sulfur in DMF.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 849–851, June, 2007. 相似文献
5.
N. V. Demidova N. Ts. Karaivanov V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2005,41(9):1167-1172
A method has been developed for the synthesis of bromo and chloro derivatives of 2,3′-biquinoline and 2,3′-biquinolones based
on the bromination and chlorination in various media. It was found that the bromination of 2,3′-biquinoline in strongly acidic
medium occurred on the 2-quinoline fragment and in weak acid on the 3-quinoline and that it takes place via a stage of formation
of a dihydro derivative. 1′-Alkyl-1′, 4′-dihydro-2,3′-biquinolin-4′-ones and 1′-alkyl-1′,2′-dihydro-2,3′-biquinolin-2′-ones
are halogenated at position 6′.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 9, pp. 1372–1377, September, 2005. 相似文献
6.
A. V. Aksenov A. V. Sarapii O. A. Antonova I. V. Borovlev V. I. Goncharov 《Chemistry of Heterocyclic Compounds》2005,41(8):1031-1035
The reaction of 1-alkyl-3-(2-quinolyl)quinolinium iodides with excess zinc in THF gives a diastereomeric mixture of 1,1′-dialkyl-3,3′-di(2-quinolyl)-1,1′,4,4′-tetrahydro-4,4′-biquinolyls.
An excess of lithium in THF gives a mixture of 1′,2′-dihydro-2,3′-biquinolyl and 1′-alkyl-1′, 4′-dihydro-2,3′-biquinolyl with
the former predominating. The reduction by lithium in THF of 1,1′-dialkyl-3,3′-di(2-quinolyl)-1,1′,4,4′-tetrahydro-4,4′-biquinolyls
leads to analogous products. Reduction of 1-alkyl-3-(2-quinolyl)quinolinium iodides by metallic potassium gives 1-alkyl-1′,4′-dihydro-2,3′-biquinolyls.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1208–1212, August, 2005. 相似文献
7.
O. A. Antonova V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2006,42(2):197-199
1,1′-Dialkyl-3,3′-di(2-quinolyl)-1,1′,4,4′-tetrahydro-4,4′-biquinolines react with organolithium and organo-magnesium compounds
to form 1′-alkyl-2′-R-1′,2′-dihydro-2,3′-biquinolines.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 2, 224–226, February, 2006. 相似文献
8.
The electrooxidation of 3,3′, 5,5′-tetramethylbenzidine (TMB) is dependent on the pH value of Britton-Robinson (B-R) buffer
solution. In this work, the electrooxidation behavior of TMB was investigated with a SnO2:F film optically transparent thin-layer
spectroelectrochemical cell. TMB underwent one two-electron electrooxidation process in the pH range from 2.0 to < 4.0, and
two successive one-electron electrooxidation processes in the pH range from 4.0 to < 7.0 in the B-R buffer solution. At pH
6.5, the electrooxidative product of TMB generated a subsequent chemical reaction to yield an azo compound. Several spectroelectrochemical
techniques, such as thin-layer cyclic voltammetry, thin-layer cyclic voltabsorptometry, thin-layer potential-controlled electrolysis
absorptometry, thin-layer single-potential-step chronoabsorptometry, thin-layer double-potential-step chronoabsorptometry,
thin-layer single-potential-step open-circuit relaxation chronoabsorptometry, were applied to this investigation. The formal
potential E0′ and the electron transfer number corresponding to the electrooxidation of TMB in B-R buffer solution, and the reaction rate
constant of the subsequent chemical reaction were determined. 相似文献
9.
G. U. Siddikov M. P. Yuldashev S. F. Aripova A. D. Vdovin N. D. Abdullaev E. Kh. Botirov 《Chemistry of Natural Compounds》2008,44(1):28-30
The new natural flavanones (+)-5,2′-dihydroxy-6,6′,7-trimethoxyflavanone and (+)-5,2′-dihydroxy-6,6′,7,8-tetramethoxyflavanone
in addition to the known flavones chrysin, norwogonin, and wogonin were isolated from Scutellaria phyllostachya roots. The structures of the isolated compounds were established using IR, UV and PMR spectra.
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Translated from Khimiya Prirodnykh Soedinenii, No. 1, pp. 24–25, January–February, 2008. 相似文献
10.
Synthesis, structures, and properties of spiro[6-azaperimidine-2,4′-cyclohexa-2′,5′-dien]-1′-one derivatives 总被引:1,自引:0,他引:1
V. N. Komissarov E. N. Gruzdeva L. P. Olekhnovich G. S. Borodkin V. N. Khrustalev S. V. Lindeman Yu. T. Struchkov V. A. Kogan V. I. Minkin 《Russian Chemical Bulletin》1997,46(11):1924-1930
The reaction of 5-amino-4-chloroquinolines with 4-amino-2,6-di-tert-butylphenol yielded derivatives of spiro[6-azaperimidine-2,4′-cyclohexa-2′,5′-dien]-1′-one, which exhibit photo-and thermochromic
properties in solutions. The structure of 2′,6′-di-tert-butyl-5,7,9-trimethylspiro[6-aza,-2,3-dihydroperimidine-2,4′-cyclohexa-2′,5′-dien]-1′-one was established by X-ray diffraction
study. The ring-chain isomerization of 2′,6′-di-tert-butyl-5,7-dimethyl-and 2′,6′-di-tert-butyl-5,7,8-trimethylspiro[6-aza-2,3-dihydroperimidine-2,4′-cyclohexa-2′,5′-dien]-1′-ones was studied by dynamic NMR spectroscopy.
Deceased.
Translated fromIzvestiya Akademii Nauk. Seriya Khimicheskaya, No. 11, pp. 2028–2034, November, 1997. 相似文献
11.
Katarzyna Michalik Zofia Drzazga Anna Michnik 《Journal of Thermal Analysis and Calorimetry》2008,93(2):521-526
A study of 2′,3′-dideoxyinosine (ddI) stability and its interaction with human serum albumin (HSA) was carried out by differential
scanning microcalorimetry DSC. Scan rate dependent and irreversible endothermic thermal degradation of ddI was analyzed with
use of kinetic approach. Observed process could be interpreted in terms of simple first-order one step kinetic model. Moreover
it was shown that ddI bound weakly to the human serum albumin and stabilized this protein. 相似文献
12.
Yu. S. Kosenkova M. P. Polovinka N. I. Komarova D. V. Korchagina S. V. Morozov A. I. Vyalkov N. Yu. Kurochkina V. A. Cheremushkina N. F. Salakhutdinov 《Chemistry of Natural Compounds》2008,44(5):564-568
Flavones 2′,5′-dimethoxyflavone, 3′-methoxy-4′,5′-methylenedioxyflavone, 3′,4′-dimethoxyflavone, 5,6,2′,3′,6′-pentamethoxyflavone,
and 5,6,2′,3′,5′,6′-hexamethoxyflavone; salicylates, methyl-4-methoxysalicylate and peonol; and bisbibenzyl polyphenol riccardin
C were isolated for the first time from the acetone extract of the aerial part of Primula macrocalyx Bge. The content of free and total fatty acids was determined by GC and GC—MS. Palmitic (16:0), octadecatetraenoic 18:4 (6,9,12,15),
linoleic 18:2 (9,12), and α-linolenic 18:3 (9,12,15) were the principal acids from the aerial part of Primula macrocalyx.
Translated from Khimiya Prirodnykh Soedinenii, No. 5, pp. 457–460, September-October, 2008. 相似文献
13.
E. V. Zhernosek S. V. Kvach L. A. Eroshevskaya E. N. Kalinichenko A. I. Zinchenko 《Chemistry of Natural Compounds》2006,42(2):208-211
Previously undescribed conjugates of 2′,3′-dideoxyuridine-5′-monophosphate-(L)-methoxytryptophylphosphoramidate (5) and 2′,3′-dideoxycytidine-5′-monophosphate-(L)-methoxytryptophylphosphoramidate (7) were isolated by a chemical enzymatic method in order to study their pharmacological properties and to prepare new medicinal
preparations based on them.
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Translated from Khimiya Prirodnykh Soedinenii, No. 2, pp. 173–175, March–April, 2006. 相似文献
14.
Zheng GH Li MN Wang L Chen ZY Qian YF Zhou Q 《Applied biochemistry and biotechnology》2008,144(2):101-109
The activated sludge process generates a large amount of excess sludge as a byproduct, which is one of the most serious challenges
in biological wastewater treatment. In the present study, the feasibility of 2,4,6-trichlorophenol (TCP) and malonic acid
(MA) as metabolic uncouplers to reduce sludge generation in the sequence batch reactor (SBR) for treating organic wastewater
for a long period was studied. The results showed that 2 mg/L TCP could reduce sludge generation by about 47%, while chemical
oxygen demand (COD) removal efficiency and sludge settlability were not obviously influenced. Although 10 mg/L MA could also
reduce excess sludge production by about 30% while slightly affecting COD removal, it seriously deteriorated sludge settlability.
Accordingly, TCP is a better uncoupler for sludge reduction for a longer period in the SBR for treating organic wastewater,
and MA can only be used as a short-term or transitional uncoupler. Microscopic and 16S ribosomal deoxyribonucleic acid analyses
showed that the microbial population of sludge varied when uncouplers were fed to the activated sludge system. Occurrence
of large amounts of filament and the disappearance of protozoa may be the main reason for the aggravation of sludge settlability
under uncoupled metabolic conditions caused by MA. 相似文献
15.
T. P. Glushenko V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2008,44(8):973-978
Methods have been developed for the synthesis of 2,3′-biquinolines, their 1′,4′-dihydro derivatives, 3-pyrid-2-ylquinolines,
and 3-pyrazin-2-ylquinoline based on the interaction of hetarylethylenes and vinyl butyl ether with imidoyl chlorides and
Vilsmeier complexes. Using the example of the synthesis of 3-hetarylquinolines and their dihydro derivatives the synthetic
possibilities of the Vilsmeier method were shown for creating various bonds in different quinoline nuclei of the bisheterocyclic
system.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 8, pp. 1209–1215, August, 2008. 相似文献
16.
Platinum-based antitumour drug ZD0473 was designed to reduce the cisplatin resistance to the tumor cells. In this paper, the mixed method of molecular mechanics and quantum chemistry, HF/lanl2dz// MM/uff and B3LYP/lanl2dz//6-31G*, are used to investigate the differences between four types of GG, 3′AG5′, 3′GA5′, and AA complexes, which are formed from four discrete DNA fragments recognized by ZD0473 and cisplatin. The results show that the binding interaction of both ZD0473 and cisplatin drugs with the GG base pair is much stronger than with other base pairs, namely the recognition capability of such drugs to the GG base pair is more considerable. Moreover, the interaction of four complexes of ZD0473 with DNA fragments is stronger than that of cisplatin with corresponding DNA fragments, which indicates the stronger binding capability of ZD0473 with DNA fragments and high antitumour activity of ZD0473. The main reason for easier forming of 3′GA5′ complex than the 3′AG5′ one is that the drug molecule prefers to bind with a single G base to form a monoligand compound firstly; then the con- figuration transformation from such monoligand compound to the bi-ligand one is limited. 相似文献
17.
Theoretical study on the hydrolysis mechanism of N,N -dimethyl- N ′-(2′,3′-dideoxy-3′-thiacytidine)formamidine 总被引:1,自引:0,他引:1
The hydrolysis mechanisms of N,N-dimethyl-N′-(2′,3′-dideoxy-3′-thiacytidine)formamidine (FA-3TC) in the gas phase and in aqueous solution were studied by use of the
density functional theory B3LYP/6-31+G(d, p) method. Two possible reaction pathways in the title reaction were considered.
In one pathway water attacks the C=N double bond first (path A) while in the other water attacks the C-N single bond first
(path B). The calculated results indicate that the first step in both pathways is the rate-limiting process and path A is
more favorable than path B in the gas phase. The effect of solvent water on the title reaction was assessed at the B3LYP/6-31+G(d,
p) level of theory based on the polarizable continuum model (CPCM). In water the first mechanism (path A) is also favored.
Supported by the National Natural Science Foundation of China (Grant Nos. 20473055 and 20773089) and the Scientific Research
Foundation for the Returned Overseas Chinese Scholars, State Education Ministry (Grant No. 20071108-18-15) 相似文献
18.
An indirect complexometric method is described for the determination of zinc(II) using 2,2′-bipyridyl as masking agent. Zinc(II)
in a given sample solution is initially complexed with an excess of EDTA and surplus EDTA is titrated with lead nitrate solution
at pH 5.0–6.0 (hexamine), using xylenol orange as indicator. An excess of 2,2′-bipyridyl is then added, the mixture shaken
well and the EDTA released from the Zn-EDTA complex is titrated with standard lead nitrate solution. Results are obtained
for 3–39 mg of Zn with relative errors ≤ 0.5% and standard deviations ± 0.06 mg. The interference of various ions are studied.
The method is applied for the determination of zinc in its alloys and ores.
Received October 27, 1998. Revision June 10, 1999. 相似文献
19.
Syntheses are given for previously unreported 4-chloro derivatives of 4H-thieno[3′,2′:5,6]- and 4H-thieno[2′,3′:5,6]pyrimido[1,2-b]isoquinolines and the reactions of these compounds with N- and S-nucleophiles were studied. The spectral characteristics
and biological activity of the positional isomers were compared. The electron spectra most clearly reflect the differences
related to the position of the sulfur atom in these quasiaromatic systems.
*For Communication 33, see [1].
Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 619–630, April, 2009. 相似文献
20.
T. P. Glushenko V. I. Goncharov A. V. Aksenov 《Chemistry of Heterocyclic Compounds》2008,44(3):314-315
A method has been developed for the synthesis of 1′-R-1′,4′-dihydro-2,3′-biquinolin-4′-ones based on the interaction of quinaldine
with N-alkyl-N-formylanthranilic acid methyl esters under the conditions of the Claisen condensation.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 3, pp. 409–410, March 2008. 相似文献