Now showing items 51-60 of 152
Axial selectivity of 1,2-nucleophilic additions to 2-(Alkylidene)cyclohexanones: Is it higher than that of 2-cyclohexenones?
(Elsevier, 1993-04-23)
2-(Alkylidene)cyclohexanones embedded in steroid systems underwent 1,2-addition of both small and sterically demanding nucleophiles to yield exclusively the axial adducts, supporting the suggestion that 2-(alkylidene)cyc ...
The preparation of (Z)-2-lithio-ortho-styryllithium via an ortho-directed lithiation
(Elsevier, 1993-11-30)
Lithiation of (Z)-2-lithiostyrene with t-butyllithium/TMEDA pentane led directly to (Z)-2-lithio-ortho-styryllithium. Subsequent treatment of this dilithio compound with difunctional electrophiles allowed the preparation ...
Potentiometric detection in ion chromatography using multi-ionophore membrane electrodes
(Elsevier, 1993-10-01)
The incorporation of ionophores selective for ammonium, potassium, sodium and calcium ions in an appropriate proportion into a plasticized poly(vinyl chloride) membrane provides a potentiometric membrane sensor with similar ...
Purification and Characterization of a Mannose-Specific Lectin from Shallot (Allium ascalonicum) Bulbs
(Elsevier, 1993-11)
A new mannose-binding lectin was isolated from shallot (Allium ascalonicum) bulbs by affinity chromatography on an immobilized D-mannose column. The lectin (A. ascojonicum agglutinin, AAA) appeared homogeneous by polyacrylamide ...
Phenelzine produces subsensitivity to nicotine
(Elsevier, 1993-09)
Dilsaver, Steven C., Meenatshisundanan Hariharan, Robin K. Davidson: Phenelzine Produces Subsensitivity to Nicotine. Prog. Neuro-Psychopharmacol. & Biol. Psychiat. 1993, 17(5): 847-860. 1. 1. The authors attempted to ...
Cultured Ehrlich Ascites Tumor Cells Show Increased N-Linked [alpha]2,6-Sialytransferase Activity
(Elsevier, 1993-06)
Ehrlich ascites tumor cells (EAT cells) are routinely grown in the peritoneal cavity of mice. These cells, EAT-wt, grow in suspension and exhibit a high level of [alpha]-2,3-O-linked sialyltransferase activity with ...
Continued search for the cellular signals that regulate regeneration of dopaminergic neurons in goldfish retina
(Elsevier, 1993-12-17)
Intraocular injections of low doses (0.7-1.4 mM estimated intraocular concentration) of 6-hydroxydopamine (6OHDA) selectively destroy dopaminergic neurons in the inner nuclear layer (INL) of goldfish retina, and they never ...