Now showing items 61-70 of 426
A quantitative anharmonic analysis of the amide A band in α-helical poly( L -alanine)
(John Wiley & Sons, Inc., 1999-03)
Polarized ir spectra of oriented films of α-helical poly( l -alanine) (α-PLA) have been obtained as a function of residual solvent dichloroacetic acid (DCA). The amide A, B, II, and V regions exhibit multiple bands whose ...
Undergraduate education in nuclear engineering in the USA
(Kluwer Academic Publishers; Akadémiai Kiadó ; Springer Science+Business Media, 1993-06)
The discipline of nuclear engineering is described, giving some historical background to explain the structure of the curricula commonly found in nuclear engineering programs in the U.S. Typical curricula are described, ...
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 ...
Calcium-dependent fusion of the plasma membrane fraction from human neutrophils with liposomes
(Elsevier, 1990-06-11)
A cell-free assay monitoring lipid mixing was used to investigate the role of Ca2+ in neutrophil membrane-liposome fusion. Micromolar concentrations of Ca2+ were found to directly stimulate fusion of inside-out neutrophil ...
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 ...
Editorial: Day 2-to-40. Proceedings from a Chemical Education Workshop Symposium
(Springer-Verlag; Springer-Verlag New York, Inc., 1998-02)
This issue of The Chemical Educator is devoted to the Proceedings from a workshop symposium that I organized for the weekend of May 10–11, 1997. The two-day event was held in the Willard H. Dow Chemical Sciences laboratory ...
Construction of molecular mechanics energy functions by mathematical transformation of ab initio force fields and structures
(John Wiley & Sons, Inc., 1991-04)
A method is presented by which ab initio (or empirical) force fields and structures can be converted to molecular mechanics energy parameters. Using Cartesian coordinates, the effect of van der Waals and other nonquadratic ...
Endothelin increases [Ca2+]i in rat pancreatic acinar cells by intracellular release but fails to increase amylase secretion
(Elsevier, 1992-08-12)
In individual fura-2 loaded cells of rat pancreatic acini endothelin-1 (ET-1) (10-50 nM) induced sustained oscillations in [Ca2+]i. At higher concentrations a larger, but transient increase in [Ca2+]i was observed, which ...
Second-generation polymeric precursors for BN and SiNCB ceramic materials
(John Wiley & Sons, Ltd., 1998-10)
Our recent work directed at the design, synthesis, characterization and applications of new types of polyborazylene and polyborosilazane polymers is reviewed with a focus on the use of these polymers as processable precursors ...