681   Asymmetric Synthesis of the Key Intermediates Leading to (-)-Aphanorphine and (-)-Eptazocine Asymmetric Synthesis of the Key Intermediates Leading to (-)-Aphanorphine and (-)-Eptazocine Alison N. Hulme, Steven S. Henry, A. I. Meyers    1995 查看全文

682   On-site wastewater treatment and reuses in Japan On-site wastewater treatment and reuses in Japan    2006 On-site wastewater treatment poses a challenging problem for engineers. It requires a balance of appropriate levels of technology and the operational complexity necessary to obtain high-quality effluent together with adequate reliability and simplicity to accommodate infrequent maintenance and monitoring. This review covers how these issues have been addressed in on-site wastewater treatment in Japan (termed johkasou). On-site systems in Japan range from outmoded designs that discharge grey wate... 查看全文

683   NMR spectroscopic evidence for the existence of tellurium-containing chalcogen rings and polymers in sulfur-tellurium and sulfur-selenium-tellurium melts NMR spectroscopic evidence for the existence of tellurium-containing chalcogen rings and polymers in sulfur-tellurium and sulfur-selenium-tellurium melts Tristram Chivers, Risto S. Laitinen, Kenneth J. Schmidt, Jari Taavitsainen    1993 查看全文

684   High-yield method for the preparation of anomalous water High-yield method for the preparation of anomalous water S. B. Brummer, G. Entine, J. I. Bradspies, H. Lingertat, C. Leung    1971 查看全文

685   Variation in the nutrient content of plants in a constructed treatment wetland system Variation in the nutrient content of plants in a constructed treatment wetland system    2002 Constructed treatment wetland (CTW) systems are becoming more prevalent in the treatment of wastewater from a variety of anthropogenic sources, particularly for polishing or tertiary treatment purposes. Within these systems, plants play a major role in treating the wastewater, including a significant role in nutrient removal. As such, there is the question of nutrient removal from the CTW system itself. The overall objective of the research, of which the work reported herein is a part, is on eva... 查看全文

686   A New Furnace For High‐Temperature Synchrotron X‐ray Powder Diffraction Experiments — Electron Density Analysis By Powder X‐ray Diffraction At 1300°C A New Furnace For High‐Temperature Synchrotron X‐ray Powder Diffraction Experiments — Electron Density Analysis By Powder X‐ray Diffraction At 1300°C Masahiko Tanaka;Masatomo Yashima;Takeharu Mori    0 A new furnace for synchrotron X‐ray powder diffraction experiments in a high‐temperature range up to 1600°C has been developed in order to obtain the detailed crystallographic information around high‐temperature structural phase transition for the diffractometer of the beam‐line 3A at the Photon Factory. The new furnace optical design is based on the flat‐specimen reflection geometry using a parallel beam. We have successfully acquired the electron density distribution map of CaTiO3 at about 130 查看全文

687   Determining the Absolute Stereochemistry of Secondary/Secondary Diols by 1H NMR:  Basis and Applications Determining the Absolute Stereochemistry of Secondary/Secondary Diols by 1H NMR:  Basis and Applications Félix Freire, José Manuel Seco, Emilio Quiñoá, and Ricardo Riguera*    2005 The absolute configuration of 1,2-, 1,3-, 1,4-, and 1,5-diols formed by two secondary (chiral) hydroxy groups can be deduced by comparison of the NMR spectra of the corresponding bis-(R)- and bis-(S)-MPA esters. The correlation between the NMR spectra of the bis-ester derivatives and the absolute stereochemistry of the diol involves the comparison of the chemical shifts of the signals for substituents R1/R2 and for the hydrogens attached to the two chiral centers [Hα(R1) and Hα(R2)] in the bis... 查看全文

688   The phagosome as the organelle linking innate and adaptive immunity. The phagosome as the organelle linking innate and adaptive immunity. Shimon Sakaguchi    0 The means by which phagocytosis and antimicrobial defense mechanisms are linked have expanded greatly in recent years. It is now clear that the process of phagocytosis does more than just degrade internalized microbes, but also helps coordinate the actions of the innate and adaptive immune system. This review will discuss the means by which Toll-like Receptor signaling pathways are coordinated around the processes of phagocytosis, phagosome trafficking and autophagy and how these signaling pathw... 查看全文

689   Rf System Operation And Procedure Rf System Operation And Procedure Andrew Butterworth Sl    0 Moving to higher energies and beam intensities will require changes in operational procedure and software. The current status of the RF system operational interface is outlined, the procedures established in 1996 are reviewed and improvements envisaged for 1997 are presented. The control of cavity oscillations and the management of cavity tuning are discussed, as are the possibilities for increasing the level of automation, including automatic switch-on of tripped units. Finally, some hardware c... 查看全文

690   Methyl deuteration reactions in vinylporphyrins: protoporphyrins IX, III, and XIII Methyl deuteration reactions in vinylporphyrins: protoporphyrins IX, III, and XIII Kevin M. Smith, Daniel W. Parish, Warren S. Inouye    1986 查看全文

691   Reductive deoxygenation of aryl aldehydes and ketones by tert-butylamine-borane and aluminum chloride Reductive deoxygenation of aryl aldehydes and ketones by tert-butylamine-borane and aluminum chloride Cheuk K. Lau, Sylvie Tardif, Claude Dufresne, John Scheigetz    1989 查看全文

692   Application of combined technologies for the treatment of phenols in wastewater oil productions Application of combined technologies for the treatment of phenols in wastewater oil productions    2009 The removal of phenols from wastewaters at crude oil production fields is one of the most important challenges in the Arauca-Field of ECOPETROL S.A. (Saravena, Arauca). Based on the review of available technologies for wastewaters treatment with variable phenol concentrations above maximum allowable limits, both at National and International levels, a combined alternative using biological (biodegradation) and physical (aeration - photo oxidation) technologies was considered. The implementation o... 查看全文

693   Mass Production of Multiwalled Carbon Nanotubes by Chemical Vapor Deposition Mass Production of Multiwalled Carbon Nanotubes by Chemical Vapor Deposition A. Magrez;Cs. Mikó;J. W. Seo;R. Gaál;L. Forró    0 We elaborated a continuous production method for multiwalled carbon nanotubes (MWCNTs) based on a rotary tube furnace. MWCNTs were synthesized by chemical vapor deposition of C2H2 over Fe1?xCox catalyst supported by carbonate. Growth parameters were optimized in a fixed bed furnace in order to increase the yield and the product quality. We have found an optimum for x=0.25, at 700°C by using CaCO3 as support. Co content does not only influence the quantity but also the quality of the product. Th... 查看全文

694   Comparative analysis of the Glendale advanced wastewater treatment plant in Lakeland, FL using bioaugmentation Comparative analysis of the Glendale advanced wastewater treatment plant in Lakeland, FL using bioaugmentation    2011 The City of Lakeland, Florida selected bioaugmentation in 2001 to treat odor and corrosion in a partial section of the collection system. The technology was in place within the sewer system for approximately six months on a limited scale and successfully controlled the odors, which challenged the City for many years. The City elected to expand the program to other select sewer areas. Over three years, bioaugmentation expanded to cover the entire sewer system, which is an area of about 100 square... 查看全文

695   General regiospecific synthesis of annulated quinones General regiospecific synthesis of annulated quinones Harold W. Moore, Steven T. Perri    1988 查看全文

696   Prostate carcinoma and green tea: PSA-triggered basement membrane degradation and MMP-2 activation are inhibited by (−)epigallocatechin-3-gallate Prostate carcinoma and green tea: PSA-triggered basement membrane degradation and MMP-2 activation are inhibited by (−)epigallocatechin-3-gallate Elga Pezzato, Luigi Sartor, Isabella Dell'Aica, Ruggero Dittadi, Massimo Gion, Claudio Belluco, Mari    2004 Prostate-specific antigen (PSA) is a serine-protease that, in addition to cleaving semenogelins in the seminal coagulum, is able to cleave extracellular matrix glycoproteins, thereby affecting cell migration and metastasis. We here report some new activities of PSA that deserve careful consideration in the cancer context: degradation of gelatin, degradation of type IV collagen in reconstituted basement membrane (Matrigel) and activation of progelatinase A (MMP-2), but not pro-MMP-9, in a cell-fr... 查看全文

697   Family History Fails to Detect the Majority of Children with High Capillary Blood Total Cholesterol Family History Fails to Detect the Majority of Children with High Capillary Blood Total Cholesterol Dennis M. Davidson, Cynthia A. Iftner, Nathan D. Wong, Josephine Van Camp, Sandra M. Landry and Beve    2009 ABSTRACT: To examine the predictive value of family history in detecting children with high blood cholesterol, finger-stick screening was done in 1,118 children ages 9–10 whose parents provided parental and grandparental history of cardiovascular disease events and risk factors. Mean blood total cholesterol was 167.7 mg/dl with no significant gender or ethnic differences. Of 157 children with blood cholesterol 200 mg/dl or greater, only 61 (38.9%) had a family history of early myocardial ... 查看全文

698   Separation of Some Low Molecular Weight Fluorocarbons by Gas Chromatography. Separation of Some Low Molecular Weight Fluorocarbons by Gas Chromatography. S. A. Greene, F. M. Wachi    1963 查看全文

699   Determining the mechanisms for aerobic granulation from mixed seed of floccular and crushed granules in activated sludge wastewater treatment Determining the mechanisms for aerobic granulation from mixed seed of floccular and crushed granules in activated sludge wastewater treatment    2012 Aerobic granulation is a novel and promising technology for wastewater treatment. However, long start-up periods required for the development of granules from floccular sludge, and the loss of biomass in this period leading to poor nutrient removal performance are key challenges. In a recent study the addition of crushed granules to a floccular sludge significantly reduced the start-up period, and also maintained the nutrient removal performance during granulation. In this study, we examined the... 查看全文

700   Stable carbocations. Part 276. Trihalomethyl cations Stable carbocations. Part 276. Trihalomethyl cations George A. Olah, Ludger Heiliger, G. K. Surya Prakash    1989 查看全文

701   Alteration of DNA Primary Structure by DNA Topoisomerase I. Isolation of the Covalent Topoisomerase I−DNA Binary Complex in Enzymatically Competent Form Alteration of DNA Primary Structure by DNA Topoisomerase I. Isolation of the Covalent Topoisomerase I−DNA Binary Complex in Enzymatically Competent Form Kristine A. Henningfeld, Tuncer Arslan, and Sidney M. Hecht*    1996 DNA ligation by DNA topoisomerase I was investigated employing synthetic DNA substrates containing a single strand nick. Site-specific cleavage of the DNA by topoisomerase I in proximity to the nick resulted in uncoupling of the cleavage and ligation reactions of the enzyme, thereby trapping the covalent enzyme?DNA intermediate. DNA cleavage could be reversed by the addition of acceptor oligonucleotides containing a free 5‘-OH group and capable of hybridizing to the noncleaved strand of the “sui 查看全文

702   Kinetics and Mechanism of Vapor Phase Oxidation of Furfural over Tin Vanadate Catalyst Kinetics and Mechanism of Vapor Phase Oxidation of Furfural over Tin Vanadate Catalyst K. Rajamani, P. Subramanian, M. S. Murthy    1976 查看全文

703   Risk analysis and decision making in relative permeability modifier water shut-off treatment Risk analysis and decision making in relative permeability modifier water shut-off treatment    2010 In the last few years, water shut off (WSO) treatments in production wells have started to become as a part of standard well service. Decision making, taking into account the uncertainties of reservoir and well data, is a difficult job with regard to WSO treatment especially with the current high oil price. The success of any relative permeability modifier (RPM) treatment is depending on the pre-treatment reservoir and well production parameters. The uncertainty within these parameters leads to ... 查看全文

704   Kinetics and Mechanism of the Reaction of Hydrogen Bromide with Ethanol Kinetics and Mechanism of the Reaction of Hydrogen Bromide with Ethanol Ernest Grunwald, S. Winstein    1947 查看全文

705   Residence time distribution and the investigation of bed movement in a Continuously Operated Upflow Filter (COUF) for tertiary wastewater treatment Residence time distribution and the investigation of bed movement in a Continuously Operated Upflow Filter (COUF) for tertiary wastewater treatment    2010 This paper describes an investigation to define the liquid phase flow regime in a continuously operated upflow filter (COUF) together with an assessment of the relative motion of the solid (filter media) phase. The importance of such measurements in the development of a model for these systems, including aerated biological filtration versions is discussed. Initial work was carried out on a model-scale demonstrator unit using Rhodamine WT fluorescent dye tracing for liquid phase studies. Initial ... 查看全文

706   Protocatechuic acid prevents reproductive damage caused by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in male rats Protocatechuic acid prevents reproductive damage caused by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in male rats H.P. NISSEN and H.W. KREYSEL    2011 In this study, it was aimed to determinate beneficial effects of protocatechuic acid (PCA) against reproductive toxicity caused by 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), an environmental contaminant. For this purpose, 28 rats were equally divided into four groups (control, TCDD 2 μg kg−1 per week, PCA 100 mg kg−1 per day and TCDD + PCA group), and compounds were orally administered for 45 days. The results indicated that TCDD induced oxidati... 查看全文

707   Addressing surface water treatment challenges in the north with two-stage pressure filtration Addressing surface water treatment challenges in the north with two-stage pressure filtration    2005 Many communities in rural Alaska must utilize river water due to the absence of other safe, adequate water sources. River water in the north is characterized by large seasonal quality differences including high turbidity during the spring, high organics during the late summer and fall, and high iron and manganese during winter. By pilot testing raw water from the Eek River, it was determined that a two-stage pressure filtration system consisting of contact clarification/flocculation followed by ... 查看全文

708   Challenges in manufacture of PFBR steam generators Challenges in manufacture of PFBR steam generators    2011 Prototype Fast Breeder Reactor (PFBR) is a 500 MWe pool type sodium cooled reactor. The main function of Steam Generator (SG) is to extract the reactor heat through secondary sodium system and convert the feed water into superheated steam in the tubes of SG. The Steam Generator is a vertical, once through, shell and tube type heat exchanger with liquid sodium in the shell side and water/steam in the tube side. The highly reactive nature of sodium with water/steam requires that the sodium to wate... 查看全文

709   Heterobimetallic, Cubane-like Mo3S4M‘ Cluster Cores Containing the Noble Metals M‘ = Ru, Os, Rh, Ir. Unprecedented Tri(μ-carbonyl) Bridge Between Ruthenium Atoms in [{(η5-Cp‘)3Mo3S4Ru}2(μ-CO)3]2+ Heterobimetallic, Cubane-like Mo3S4M‘ Cluster Cores Containing the Noble Metals M‘ = Ru, Os, Rh, Ir. Unprecedented Tri(μ-carbonyl) Bridge Between Ruthenium Atoms in [{(η5-Cp‘)3Mo3S4Ru}2(μ-CO)3]2+ Konrad Herbst,† Magda Monari,‡ and Michael Brorson*†    2001 Reaction of the methylcyclopentadienyl (Cp‘) cluster compound [(η5-Cp‘)3Mo3S4][pts] (pts = p-toluenesulfonate) with noble metal alkene complexes resulted in the formation of four new heterobimetallic cubane-like Mo3S4M‘ cluster cores (M‘ = Ru, Os, Rh, Ir). Thus, reaction with [(1,5-cod)Ru(CO)3] or [(1,3-cod)Os(CO)3] (cod = cyclooctadiene) afforded [(η5-Cp‘)3Mo3S4M‘(CO)2][pts] (M‘ = Ru:? [1][pts]; M‘ = Os:? [2][pts]). When [1][pts] was kept in CH2Cl2/pentane solution, partial loss of carbonyl lig 查看全文

710   Reactions of dimethyl .beta.-ketoglutarate with 1,2-dicarbonyl compounds. 6. Reactions of dicarbonyl compounds with dimethyl .beta.-ketoglutarate. 4. Formation of 1:1 adducts Reactions of dimethyl .beta.-ketoglutarate with 1,2-dicarbonyl compounds. 6. Reactions of dicarbonyl compounds with dimethyl .beta.-ketoglutarate. 4. Formation of 1:1 adducts S. Yang-Lan, M. Mueller-Johnson, J. Oehldrich, D. Wichman, J. M. Cook, Ulrich. Weiss    1976 查看全文

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