The following silver and copper complexes in which quinine is coordinated via the two possible donor atoms was prepared and characterized. Coordination of quinine via the hydroxyl oxygen and quinoline nitrogen is observed in C20H25N2O2Cu2(SO4)2.6H2O and C20H25N2O2Ag2(SO4). The existence of the proton at the coordinated hydroxyl oxygen is also observed in these complexes. The coordination mode and the conformation of quinine can be derived from IR and Raman spectra and by using NMR techniques.
New analytical strategies and techniques are necessary to meet requirements of modern technologies and new materials. In this sense, this book provides a thorough review of current analytical approaches, industrial practices, and strategies in Fourier transform application.
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: Circulating Immune Complexes and trace elements (Copper, Iron and Selenium) as markers in oral precancer and cancer : a randomised, controlled clinical trial
Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Self-assembly of copper and cobalt complexes with hierarchical size and catalytic properties for hydroxylation of phenol
We studied the interaction of several metal ions with the
copper chaperone fromEnterococcus hirae(EhCopZ). We
show that the stoichiometry of the protein–metal complex
varies with the experimental conditions used. At high con-centration of the protein in a noncoordinatingbuffer, a
dimer, (EhCopZ)2–metal, was formed. The presence of a
potentially coordinatingmolecule L in the solution leads to
the formation of a monomeric ternary complex, EhCopZ–
Cu–L, where L can be a buffer or a coordinatingmole-cule (glutathione, tris(2-carboxyethyl)phosphine). ...
Theoxidation-promotingreactivityof copper(II) complexof
aminoglycosidic antibiotic amikacin [Cu(II)-Ami] in the
presence of hydrogen peroxide, was studied at pH 7.4, using
2¢-deoxyguanosine (dG), pBR322 plasmid DNA and yeast
as target molecules. Themixtures of complexwith
H2O2were found to be efficient oxidants, converting dG to
its 8-oxo derivative, generating strand breaks in plasmid
DNA and multiple cleavages in tRNA
Operating Principle: As the tool approaches
the work piece it erodes
the negative shape of it.
Thus complex shapes are
made from soft copper
metal and used to
duplicates of it. This
process is called
Growth in wireless services is increasing the number of copper and fiber cables that must be managed – causing an increased workload for reconfigurations and maintenance. Meeting the challenge of increasing profits in the face of fewer capital and operating resources to manage this steadily growing and more complex wireless network infrastructure requires improvements in operational efficiency from Network Operations.
Telecommunication networks are not static.
In order to support evolving service offerings,
they must evolve in size, shape and complexity.
Initial network design should consider the
need for expansion and growth. Proper design
plays a critical role in determining whether a
network is an effective revenue generator, or
whether it loses profitability through excess
labour costs and missed service opportunities.
FlexDSX™ cross-connect products provide
the necessary network flexibility.
The two maquiladoras in our sample were selected on the basis of two criteria: (i) each is
reputed to be a leading industrial source of air pollution, and (ii) the detailed technical data
needed to estimate their emissions are available. Some brief additional explanation may be
We began the process of selecting maquiladoras for this study with a list of Paso del
Norte’s leading industrial sources of air pollution, compiled from informal information provided
by local stakeholders. We used U.S.
Campus-RS™ is a versatile symmetric digital subscriber line (SDSL) system – ideal for a wide
range of private networking environments, including corporate campuses, universities,
medical complexes and military facilities. Campus-RS provides reliable, high-speed enterprise
connectivity using the existing copper cable plant.
Biogenesis of cytochromec oxidase (COX) is a highly complex process
involving 30 chaperones in eukaryotes; those required for the incorpora-tion of the copper and heme cofactors are also conserved in bacteria.
Surf1, associated with hemeainsertion and with Leigh syndrome if defec-tive in humans, is present as two homologs in the soil bacterium Paracoc-cus denitrificans, Surf1c and Surf1q.
Plasma concentrations of free fatty acids are increased in metabolic syn-drome, and the increased fatty acids may cause cellular damage via the
induction of oxidative stress. The present study was designed to determine
whether the increase in fatty acids can modify the free sulfhydryl group in
position 34 of albumin (Cys34) and enhance the redox-cycling activity of
the copper–albumin complex in high-fat diet-induced obese mice.
Plastocyanin (Pc) is a soluble copper protein that transfers
electrons from cytochromeb6
fto photosystem I (PSI), two
protein complexes that are localized in the thylakoid mem-branes in chloroplasts. The surface electrostatic potential
distributionof Pc plays akey role in complex formationwith
the membrane-bound partners. It is practically identical for
Pcs fromplants and green algae, but is quite different for Pc
Potassium permanganate absorbed on copper(II) sulfate pentahydrate oxidizes aniline into azobenzene under heterogenous conditions. Azoxybenzene is a minor by-product. Under solventless reaction conditions, the oxidation does not take place owing to predominant complex formation between copper(II) and aniline. The influence of the nature of the solvent as well as the replacement of copper(II) sulfate pentahydrate by several other inorganic salt hydrates on the potassium permanganate promoted oxidation of aniline is described.