Now showing items 1-10 of 94
Ion beam modification of metals: Compositional and microstructural changes
(Elsevier, 1989)
Ion implantation has become a highly developed tool for modifying the structure and properties of metals and alloys. In addition to direct implantation, a variety of other ion beam techniques such as ion beam mixing, ion ...
Local bonding configurations of amorphous SexTe1-x films
(Elsevier, 1989-12-01)
X-ray absorption measurements at both the Se and Te K-edges have been performed in binary chalcogenide amorphous (a-) SexTe1-x films. The EXAFS results for the Se K-edge indicate that the number of Se-Se bonds decreases ...
MoFe Cofactor of nitrogenase: Extraction, purification, and characterization
(Elsevier, 1989-08)
Estimation of micromixing parameters from tracer concentration fluctuation measurements
(Elsevier, 1989)
A method of micromixing parameter estimation is proposed which is convenient and applicable to a wide variety of models. One conducts a typical tracer reponse test, except that in addition to the (time-averaged) mean tracer ...
Linearized embedding: A new metric matrix algorithm for calculating molecular conformations subject to geometric constraints
(John Wiley & Sons, Inc., 1989-10)
There are many methods in the literature for calculating conformations of a molecule subject to geometric constraints, such as those derived from two-dimensional NMR experiments. One of the most general ones is the EMBED ...
Transtubular bioreactor: A perfusion device for mammalian cell cultivation
(Kluwer Academic Publishers; Science & Technology Letters ; Springer Science+Business Media, 1989-01)
A transtubular mammalian cell perfusion chamber has been developed that allows separate delivery and control of medium and gas flow to the cells. The hydrodynamic and mass transfer characteristics of the reactor are studied ...
Measurement of ammonia and glutamine in cell culture media by gas sensing electrodes
(Kluwer Academic Publishers; Science & Technology Letters ; Springer Science+Business Media, 1989-04)
This paper describes the use of a commercially available off-line gas sensing electrode for determination of ammonia and glutamine in cell culture media. The measurement technique was tested in different media preparations ...
Sensitive high-performance liquid chromatographic assay using 9-fluorenylmethylchloroformate for monitoring controlled-release lidocaine in plasma
(Elsevier, 1989)
A sensitive high-performance liquid chromatographic (HPLC) assay using fluorescence detection for quantifying lidocaine levels in plasma (in the ng/ml range) was developed. This novel HPLC assay has made possible the ...