Biomedical subjects
M L Gordon
Publications and source records attributed to M L Gordon.
Mutations in the gag gene of Moloney murine leukemia virus: effects on production of virions and reverse transcriptase.
We have constructed a series of deletion mutations in the p30 and p10 domains of the gag gene of Moloney murine leukemia virus. Mutants with deletions in P30 were completely defective in virion particle production even though an altered gag precursor protein is synthesized. This domain is apparently critical for particle formation. A mutant in P10 was able to release virion particles into the medium, and low levels of reverse transcriptase activity could be detected in these virions. To explore the effects of these mutations on the utilization of the gag-pol precursor, we have introduced these mutants into cells already releasing defective particles from an endogenous provirus which directs the synthesis of gag gene products and not pol gene products. The P10 mutant was capable of providing pol function as judged by the incorporation of high levels of reverse transcriptase into the particles and complete complementation for XC plaque formation. In contrast, the mutants in P30 were negative in this complementation test. Thus, those gag mutants which were unable on their own to assemble virion particles were also unable to contribute the gag-pol precursor to these particles. These mutations are the first to be mapped to the gag region which affect pol function, suggesting that the gag-pol precursor must be assembled before pol is functionally separated from the gag domain. The concordance of the effects of different mutations on both particle formation and gag-pol utilization suggests that similar domains of gag (namely, domains in the P30 region) are needed for these two processes.
BIOSYNTHESIS OF VALINE AND ISOLEUCINE, VI. ENZYME REPRESSION IN SALMONELLA.
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The role of clobetasol propionate emollient 0.05% in the treatment of patients with dry, scaly, corticosteroid-responsive dermatoses.
The use of topical corticosteroids has significantly enhanced the treatment of patients with dermatoses such as psoriasis and eczema. In particular, group I high-potency corticosteroids such as clobetasol propionate have proved safe and effective for limited-course treatment of inflammatory and pruritic manifestations of moderate-to-severe corticosteroid-responsive dermatoses. At the same time, much effort has gone into devising more effective strategies for addressing the dry skin conditions associated with various dermatologic disorders. An emollient added to a steroid, although not itself an active ingredient, can help restore the normal moisturizing process of the skin; this may be particularly important in soothing the discomfort of the dry skin conditions often encountered in moderate-to-severe dermatoses. In addition, the degree of epidermal hydration can affect the penetration of steroids into the skin. Therefore, successful outcomes in the treatment of patients with corticosteroid-responsive dermatoses may involve more than use of an effective topical steroid. This article examines a currently available cream formulation of 0.05% clobetasol propionate containing moisturizers--emollients, dimethicone, and a humectant--that may contribute to improved moisture content in treated skin. A review of recent studies shows that clobetasol propionate emollient cream is well tolerated and effective in courses of up to 4 weeks for the treatment of patients with psoriasis or atopic dermatitis.
Case management: professional excellence and quality care.
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Monteggia fracture. A combined surgical approach employing a single lateral incision.
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