Now showing items 11-20 of 125
Heating characteristics and atomic emission waveforms for glow discharge ion bombardment furnaces
(Elsevier, 1991)
Ion bombardment of a graphite cathode in a glow discharge plasma is used to heat the cathode to temperatures suitable for the vaporization of solution residues from the cathode surface. Two low-mass cathode configurations ...
The NMDA receptor antagonist MK-801 increases morphine catalepsy and lethality
(Elsevier, 1991-03)
Interactions between excitatory amino acids and opioids were examined by studying the ability of the noncompetitive N-methyl-D-aspartate (NMDA) receptor antagonist MK-801 to affect morphine catalepsy and lethality. MK-801 ...
Selective multiple methylene insertion reactions mediated by iodomethylzine iodide: Mechanistic considerations and synthetic applications
(Elsevier, 1991-04-15)
The reaction of alkynylcoppers 1 with an excess of iodomethylzinc iodide selectively furnishes the quadruple methylene insertion copper organometallics 2 in fair to good yields. The mechanism of the reaction has been ...
Follicle-stimulating hormone signal transduction: Role of carbohydrate in aromatase induction in immature rat Sertoli cells
(Elsevier, 1991-08)
Receptor activated adenylate cyclase acts as a major transmembrane signalling system. It is widely accepted that upon binding to its receptor, follicle-stimulating hormone (FSH) activates the cAMP-dependent pathway which ...
Roles of multiple accessory molecules in T-cell activation
(Elsevier, 1991-06)
Accessory molecules expressed on T cells can mediate adhesion between T cells and other cells, or the extracellular matrix. The same T-cell accessory molecules participate in a dialogue with their ligands (counter-receptors) ...
Activity of acyclic halogenated tubercidin analogs against human cytomegalovirus and in uninfected cells
(Elsevier, 1991-09)
Novel acyclic halogenated tubercidins (4-amino-5-halo-7-[(2-hydroxyethoxy)-methyl]pyrrolo[2,3-d]pyrimidines) were examined for their ability to inhibit human cytomegalovirus (HCMV) in yield reduction assays. 5-Bromo acyclic ...
Reproduction numbers and thresholds in stochastic epidemic models I. Homogeneous populations
(Elsevier, 1991-12)
We compare threshold results for the deterministic and stochastic versions of the homogeneous SI model with recruitment, death due to the disease, a background death rate, and transmission rate [beta]cXY / N. If an infective ...
Tn917 transposase. Sequence correction reveals a single open reading frame corresponding to the tnpA determinant of Tn3-family elements
(Elsevier, 1991-03)
A nucleotide sequence correction on the Enterococcus faecalis transposon Tn917 indicates that what was formerly thought to be two open reading frames (ORF5 and ORF6) is actually one reading frame (ORF5). The latter exhibits ...
Physiological changes during the adaptation of hybridoma cells to low serum and serum-free media
(Wiley Subscription Services, Inc., A Wiley Company, 1991-01-05)
Two murine hybridoma cell lines (167.4G5.3 and S3H5/Γ2bA2) were adapted to grow in low-serum and serum-free media by a weaning procedure. The changes in cell growth, metabolic, and antibody production rates with adaptation ...