Now showing items 51-60 of 158
New mannose-specific lectins from garlic (Allium sativum) and ramsons (Allium ursinum) bulbs
(Elsevier, 1992-05-22)
Two new mannose-binding lectins were isolated from garlic (Allium sativum, ASA) and ramsons (Allium ursinum, AUA) bulbs, of the family Alliaceae, by affinity chromatography on immobilized mannose. The carbohydrate-binding ...
Interaction between bacteriophage [lambda] and its Escherichia coli host
(Elsevier, 1992)
Bacteriophage [lambda] relies to a large extent on processes requiring interactions between viral- and host-encoded proteins for its lytic growth, establishment of lysogeny, and release from the prophage state. Both ...
Preparation and Reactivity of Polyfunctional Zinc and Copper Organometallics Bearing Sulfur Functionalities
(Elsevier, 1992)
Iodomethylthiobenzoate 5 and [alpha]-chloroalkyl phenyl sulfides 6 were found to insert zinc dust in THF under very mild conditions (10-25 [deg]C, 0.5-2 h) leading to zinc [alpha]-thioorganometallics. After a transmetallation ...
Intragenic complementation between Escherichia coli trp repressors with different defects in the tryptophan-binding pocket
(Elsevier, 1992-08-01)
Site-directed mutagenesis of the trpR gene (encoding the trp repressor, TrpR) was used to replace Gly85 with tryptophan (Trp or W), in order to place Trp near its normal location in the -tryptophan(-W)-binding pocket. The ...
Detection of oxidative mutagens in an urban air-particulate extract: a preliminary study
(Elsevier, 1992-12)
The Ames assays strains TA98 and TA100 have been useful in characterizing complex mixtures from organic solvent extracts of particles from diesel-powered vehicles, ambient air, and other sources. In this paper we report ...
A convenient, highly stereoselective synthesis of anti-[alpha],[beta]-epoxy alcohols by the Luche reduction of [alpha],[beta]-epoxy ketones
(Elsevier, 1992-10-27)
Reduction of [alpha],[beta]-epoxy ketones under the Luche conditions with NaBH4/CeCl3 in MeOH provides anti- (or erythro-) [alpha],[beta]-epoxy alcohols in high yields and with extremely high stereoselectivity.
Memory T lymphocyte hyporesponsiveness to non-cognate stimuli: a key factor in age-related immunodeficiency
(WILEY-VCH Verlag GmbH, 1992-04)
Previous studies from our laboratory have suggested that aging leads to an accumulation of cells expressing high levels of CD44, thought to be a marker for memory lymphocytes, and that positively selected CD44 hi T cells, ...
Rapid generation of region-specific genomic clones by chromosome microdissection: Isolation of DNA from a region frequently deleted in malignant melanoma
(Elsevier, 1992-11)
Malignant melanoma is frequently characterized by the deletion of the long arm of chromosome 6 (usually encompassing 6q16-q21). In an effort to saturate this region with DNA markers, microdissection and molecular cloning ...
Introduction: A tribute to David L. Nanney, an experimental ciliatologist
(Wiley Subscription Services, Inc., A Wiley Company, 1992)
No Abstract.