Now showing items 661-670 of 692
Characterization and regulation of phosphatidylglycerolphosphate phosphatase in Saccharomyces cerevisiae
(Elsevier, 1990-09-18)
Phosphatidylglycerophosphatase (EC 3.1.3.27) activity was characterized in mitochondrial extracts from Saccharomyces cerevisiae. The enzyme has a pH optimum of 5.5. Maximum activity occurs in the presence of Triton X-100 ...
Hydrodesulfurization over model sulfide cluster-derived catalysts
(Elsevier, 1991)
There is growing interest in the use of organometallic clusters as precursors to model heterogeneous catalysts. This interest is partially derived from the expectation that "solid-state metal complex catalysts" will be ...
Optimization of parameters of nonbonded interactions in a spectroscopically determined force field
(Elsevier, 1993-03)
A procedure is given by which parameters of nonbonded interactions in a molecular mechanics energy function can be optimized for maximum compatibility with ab initio force fields and structures. The method is based on a ...
Colloidally induced smectitic fines migration: Existence of microquakes
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1997-03)
The phenomenon of colloidally induced fines migration is a challenge of both scientific and industrial importance. Its occurrence impacts permeability reduction and alteration of flow pathways in porous media, particulate ...
Acid- and base-treated Fe 3+ -TiO 2 -pillared clays for selective catalytic reduction of NO by NH 3
(Kluwer Academic Publishers; Springer Science+Business Media, 1999-03)
Fe 3+ -ion-exchanged delaminated pillared clays (PILCs) have been found previously to be more active than the vanadia-based catalysts for selective catalytic reduction (SCR) of NO by NH 3 . The effects of acid treatment ...
VRI: 3D QSAR at variable resolution
(John Wiley & Sons, Inc., 1999-11-15)
VRI (Variable Resolution Invariants) is a new approach to quantitative structure–activity relations that makes use of three-dimensional features of molecules at different levels of spatial resolution as well as levels of ...
Pharmacophore elements of the TIPP class of delta opioid receptor antagonists
(Kluwer Academic Publishers; ESCOM Science Publishers B.V. ; Springer Science+Business Media, 1994-10)
A series of tri-and tetrapeptides sharing the amino-terminal dipeptide unit Tyr-Tic, found in the high-affinity delta opioid receptor antagonist Tyr-Tic-Phe-Phe (TIPP), was prepared and evaluated in receptor binding assays ...
Degradation of polyurethanes in vitro and in vitro: comparison of different models
(Elsevier, 1993-11-08)
This study compares and contrasts mechanisms of polyetherurethane (PEU) degradation in vitro and in vivo. Models comprising incubation with hydrogen peroxide in vitro (H2O2), in vivo subcutaneous rat implant (SUBQ), and ...
Stochastic aspects of turbulent combustion processes
(Elsevier, 1991-02)
Methods of using stochastic simulations to treat nonlinear interactions in turbulent combustion processes are described -- emphasizing the use of statistical time-series techniques to analyze the turbulence--radiation ...
Inversion and zero dynamics in nonlinear multivariable control
(American Institute of Chemical EngineersWiley Periodiocals, Inc., 1991-04)
This work concerns general multiple-input/multiple-output (MIMO) nonlinear systems with nonsingular characteristic matrix. For these systems, the problem of inversion is revisited and explicit formulas are derived for the ...