Now showing items 71-80 of 465
An evaluation of the rotational barrier about the B---N bond of 1-aminoborepins
(Elsevier, 1994-04-05)
13C NMR spectroscopy has been used to determined the barriers to rotation about the B---N bonds of 1-(N-benzyl-N-methylamino)borepin and 1-(N-benzyl-N-methylamino)-4,5-dihydroborepin as 18 and 19.8 kcal mol-1, respectively. ...
Excitatory amino acidergic pathways and receptors in the basal ganglia
(Springer-Verlag, 1991-10)
The striatum receives the majority of excitatory amino acidergic input to the basal ganglia from neocortical and allocortical sources. The subthalamic nucleus and the substantia nigra also receive excitatory amino acidergic ...
Hydrogen-induced low temperature CO displacement from the Pt(111) surface
(Elsevier, 1990-10-02)
A new low temperature displacement mechanism for CO on the Pt(111) surface has been observed in the presence of high pressures of hydrogen (0.001 to 0.1 Torr H2). Temperature-programmed fluorescence yield near-edge ...
Living ring opening metathesis polymerization of mesogenic norbornene derivatives
(Wiley Periodicals, Inc.Hüthig & Wepf Verlag, 1994-01)
A new class of SCLCPs was prepared by polymerizing mesogenic norbornene derivatives using Mo(CHCMe 2 R)(N‐2,6‐C 6 H 3 ‐ i ‐Pr 2 )(O‐ t ‐Bu) 2 (R = CH 3 or Ph). Monomers based on norbornene ring systems were chosen because ...
Interaction of viable group a streptococci and hydrogen peroxide in killing of vascular endothelial cells
(Elsevier, 1993-05)
Previous studies have shown that the streptococcal hemolysin, streptolysin S, is capable of interacting with hydrogen peroxide (H2O2) to injure vascular endothelial cells (Free Radic. Biol. Med. 7:369-376; 1989). To extend ...
Adapting Homogeneous Enzyme-Linked Competitive Binding Assays to Microtiter Plates
(Elsevier, 1994-04)
Recently devised homogeneous enzyme-linked binding assays useful for the rapid detection of carbohydrate structure/content of intact glycoproteins (via use of lectins as binders) and for quantitating given vitamins (e.g., ...
Highly stereoselective preparation of nitro olefins and nitro dienes by the addition-elimination of copper-zinc organometallics to [beta]-alkylthio and [beta]-phenylsulfonyl nitro olefins
(Elsevier, 1991-01-21)
The addition-elimination of copper-zinc organometallics RCu(CN)ZnX to (E)-1-nitro-2-phenylsulfonyl ethylene 2a gave highly functionalized pure (E) nitro olefins and stereoselectively (1E, 3E) and (1E, 3Z)-1-nitrodienes in ...
Chemical permeabilization and in situ removal of daidzein from biologically viable soybean (Glycine max) seeds
(Kluwer Academic Publishers; Chapman and Hall ; Springer Science+Business Media, 1998-09)
After 24 h of chemical permeabilization with 20% (v/v) methanol at 25 °C, the amount of daidzein released from soybean seeds is 15 to 20% of the amount (0.0423 ± 0.0045 mg/g seed dry wt) obtained by physical grinding. With ...
Inhibition of hypochlorous acid-mediated reactions by desferrioxamine. Implications for the mechanism of cellular injury by neutrophils
(Elsevier, 1990)
Inhibition of free radical mechanisms by desferrioxamine, an iron chelator, is often thought to be a good indicator of iron-catalyzed hydroxyl radical (OH[middle dot]) production. The specificity of desferrioxamine is ...