Mechanistic Analysis of Reductive Nitrosylation on Water-Soluble Cobalt(III)-Porphyrins

2006 ◽  
Vol 128 (24) ◽  
pp. 8042-8053 ◽  
Author(s):  
Federico Roncaroli ◽  
Rudi van Eldik
Keyword(s):  
Water Soluble ◽  
Reductive Nitrosylation ◽  
Mechanistic Analysis

Nitrite Catalyzes Reductive Nitrosylation of the Water-Soluble Ferri-Heme Model FeIII(TPPS) to FeII(TPPS)(NO)

2003 ◽  
Vol 42 (1) ◽  
pp. 2-4 ◽  
Author(s):  
Bernadette O. Fernandez ◽  
Ivan M. Lorković ◽  
Peter C. Ford
Keyword(s):  
Water Soluble ◽  
Reductive Nitrosylation

Water-soluble NHC-Cu catalysts: applications in click chemistry, bioconjugation and mechanistic analysis

2014 ◽  
Vol 12 (46) ◽  
pp. 9350-9356 ◽  
Author(s):  
Heriberto Díaz Velázquez ◽  
Yara Ruiz García ◽  
Matthias Vandichel ◽  
Annemieke Madder ◽  
Francis Verpoort
Keyword(s):  
Click Chemistry ◽  
Aqueous Media ◽  
Water Soluble ◽  
Heterogeneous Catalytic ◽  
Mechanistic Analysis ◽  
Cu Catalysts

A series of novel bis(NHC) Cu(i) catalysts enables the production of triazoles with different substitution patterns and bioconjugation via “click” chemistry under homogeneous and/or heterogeneous catalytic conditions in aqueous media.

Probing fundamental mechanisms of nitric oxide reactions with metal centers

2004 ◽  
Vol 76 (2) ◽  
pp. 335-350 ◽  
Author(s):  
P. C. Ford
Keyword(s):  
Nitric Oxide ◽  
Heme Proteins ◽  
Flash Photolysis ◽  
Chemical Properties ◽  
Water Soluble ◽  
Model Complexes ◽  
Metal Centers ◽  
Reductive Nitrosylation

Studies in this laboratory have been concerned with mapping the chemical properties and mechanisms of NO interactions with hemes and other metal centers. These are models relevant to the mammalian biology of nitric oxide, an important bioregulatory molecule. Presented here will be an overview of flash photolysis kinetics investigations of ferri- and ferro-heme nitrosyl formation in model complexes and several heme proteins. Also described will be ongoing studies of reductive nitrosylation mechanisms involving the reactions of NO with water-soluble Fe(III) porphyrins and ferri-heme proteins and of several Cu(II) model complexes.

Electrochemical and Spectral Studies on the Reductive Nitrosylation of Water-Soluble Iron Porphyrin

2003 ◽  
Vol 42 (6) ◽  
pp. 1945-1951 ◽  
Author(s):  
Natalia S. Trofimova ◽  
Alexander Y. Safronov ◽  
Osamu Ikeda
Keyword(s):  
Water Soluble ◽  
Spectral Studies ◽  
Iron Porphyrin ◽  
Soluble Iron ◽  
Reductive Nitrosylation

Reductive nitrosylation of water-soluble iron porphyrins by S-nitroso-N-acetylpenicillamine: Rate constants and EPR characterization

2006 ◽  
Vol 100 (11) ◽  
pp. 1722-1729 ◽  
Author(s):  
Fernando S.D.S. Vilhena ◽  
Alan W.S. da Silva ◽  
Sonia R.W. Louro
Keyword(s):  
Rate Constants ◽  
Water Soluble ◽  
Iron Porphyrins ◽  
Soluble Iron ◽  
Reductive Nitrosylation

A Resorcinol-Formaldehyde Resin as an Embedding Material for Electron Microscopy of Membranes

1969 ◽  
Vol 27 ◽  
pp. 328-329 ◽  
Author(s):  
J. G. Robertson ◽  
D. F. Parsons
Keyword(s):  
Electron Microscopy ◽  
Osmium Tetroxide ◽  
Neutral Lipids ◽  
Lipid Extraction ◽  
Water Soluble ◽  
Formaldehyde Resin ◽  
Electron Microscope Autoradiography ◽  
Resorcinol Formaldehyde ◽  
Major Disadvantage ◽  
Cell Organization

The extraction of lipids from tissues during fixation and embedding for electron microscopy is widely recognized as a source of possible artifact, especially at the membrane level of cell organization. Lipid extraction is also a major disadvantage in electron microscope autoradiography of radioactive lipids, as in studies of the uptake of radioactive fatty acids by intestinal slices. Retention of lipids by fixation with osmium tetroxide is generally limited to glycolipids, phospholipids and highly unsaturated neutral lipids. Saturated neutral lipids and sterols tend to be easily extracted by organic dehydrating reagents prior to embedding. Retention of the more saturated lipids in embedded tissue might be achieved by developing new cross-linking reagents, by the use of highly water soluble embedding materials or by working at very low temperatures.

Ferritin Labeled Antibody Staining of Thin Sections

1969 ◽  
Vol 27 ◽  
pp. 420-421
Author(s):  
J. D. McLean ◽  
S. J. Singer
Keyword(s):  
Biological Material ◽  
Water Soluble ◽  
Thin Sections ◽  
Antibody Staining ◽  
Thin Sectioning ◽  
Ultrathin Sections

The successful application of ferritin labeled antibodies (F-A) to ultrathin sections of biological material has been hampered by two main difficulties. Firstly the normally used procedures for the preparation of material for thin sectioning often result in a loss of antigenicity. Secondly the polymers employed for embedding may non-specifically absorb the F-A. Our earlier use of cross-linked polyampholytes as embedding media partially overcame these problems. However the water-soluble monomers used for this method still extract many lipids from the material.

The Effect of Benzene on Bluegill Olfactory Lamellae

1985 ◽  
Vol 43 ◽  
pp. 574-575
Author(s):  
D.R. Mattie ◽  
J.W. Fisher
Keyword(s):  
Surface Morphology ◽  
Soluble Fraction ◽  
Lepomis Macrochirus ◽  
Sublethal Concentration ◽  
Water Soluble ◽  
Major Constituent ◽  
Jet Fuels ◽  
Aquatic Biota ◽  
Normal Surface ◽  
Cacodylate Buffer

Jet fuels such as JP-4 can be introduced into the environment and come in contact with aquatic biota in several ways. Studies in this laboratory have demonstrated JP-4 toxicity to fish. Benzene is the major constituent of the water soluble fraction of JP-4. The normal surface morphology of bluegill olfactory lamellae was examined in conjunction with electrophysiology experiments. There was no information regarding the ultrastructural and physiological responses of the olfactory epithelium of bluegills to acute benzene exposure.The purpose of this investigation was to determine the effects of benzene on the surface morphology of the nasal rosettes of the bluegill sunfish (Lepomis macrochirus). Bluegills were exposed to a sublethal concentration of 7.7±0.2ppm (+S.E.M.) benzene for five, ten or fourteen days. Nasal rosettes were fixed in 2.5% glutaraldehyde and 2.0% paraformaldehyde in 0.1M cacodylate buffer (pH 7.4) containing 1.25mM calcium chloride. Specimens were processed for scanning electron microscopy.

An SEM study of raphide crystal initials in the leaves of vitis (grape)

1995 ◽  
Vol 53 ◽  
pp. 984-985
Author(s):  
H. J. Arnott ◽  
M. A. Webb ◽  
L. E. Lopez
Keyword(s):  
Calcium Oxalate ◽  
Water Soluble ◽  
Calcium Oxalate Crystals ◽  
Calcium Oxalate Crystal ◽  
Oxalate Crystals ◽  
Large Numbers ◽  
Sem Study ◽  
The Matrix ◽  
Crystal Cells ◽  
Crystal Idioblast

Many papers have been published on the structure of calcium oxalate crystals in plants, however, few deal with the early development of crystals. Large numbers of idioblastic calcium oxalate crystal cells are found in the leaves of Vitis mustangensis, V. labrusca and V. vulpina. A crystal idioblast, or raphide cell, will produce 150-300 needle-like calcium oxalate crystals within a central vacuole. Each raphide crystal is autonomous, having been produced in a separate membrane-defined crystal chamber; the idioblast''s crystal complement is collectively embedded in a water soluble glycoprotein matrix which fills the vacuole. The crystals are twins, each having a pointed and a bidentate end (Fig 1); when mature they are about 0.5-1.2 μn in diameter and 30-70 μm in length. Crystal bundles, i.e., crystals and their matrix, can be isolated from leaves using 100% ETOH. If the bundles are treated with H2O the matrix surrounding the crystals rapidly disperses.

Characterization of Chemical Impurities in Glutaraldehyde

1975 ◽  
Vol 33 ◽  
pp. 620-621
Author(s):  
B. J. Grenon ◽  
A. J. Tousimis
Keyword(s):  
Glutaric Acid ◽  
Spectroscopic Analysis ◽  
Aldol Condensation ◽  
Condensation Product ◽  
Amorphous Solid ◽  
Water Soluble ◽  
Impurity Component ◽  
Chemical Impurities ◽  
Soluble Liquid

Ever since the introduction of glutaraldehyde as a fixative in electron microscopy of biological specimens, the identification of impurities and consequently their effects on biologic ultrastructure have been under investigation. Several reports postulate that the impurities of glutaraldehyde, used as a fixative, are glutaric acid, glutaraldehyde polymer, acrolein and glutaraldoxime.Analysis of commercially available biological or technical grade glutaraldehyde revealed two major impurity components, none of which has been reported. The first compound is a colorless, water-soluble liquid with a boiling point of 42°C at 16 mm. Utilizing Nuclear Magnetic Resonance (NMR) spectroscopic analysis, this compound has been identified to be — dihydro-2-ethoxy 2H-pyran. This impurity component of the glutaraldehyde biological or technical grades has an UV absorption peak at 235nm. The second compound is a white amorphous solid which is insoluble in water and has a melting point of 80-82°C. Initial chemical analysis indicates that this compound is an aldol condensation product(s) of glutaraldehyde.

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