301
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Katz E. CHA/CCHSE convention recap. DIMENSIONS IN HEALTH SERVICE 1979; 56:38-42. [PMID: 38162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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302
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Cooper JA, Moss B, Katz E. Inhibition of vaccinia virus late protein synthesis by isatin-beta-thiosemicarbazone: characterization and in vitro translation of viral mRNA. Virology 1979; 96:381-92. [PMID: 462812 DOI: 10.1016/0042-6822(79)90096-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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303
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Katz E, Kamal F, Mason K. Biosynthesis of trans-4-hydroxy-L-proline by Streptomyces griseoviridus. J Biol Chem 1979; 254:6684-90. [PMID: 447743] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Radioisotopic experiments have revealed that free trans-4-hydroxy-L-proline is an intermediate synthesized from L-proline during formation of the peptide-bound cis-4-hydroxy-D-proline residue in the antibiotic, etamycin. This conclusion was based on the fact that 1) both radiolabeled L-proline and trans-4-hydroxy-L-proline are precursors of the bound D-imino acid as noted previously by Hook and Vining ((1973) J. Chem. Soc. Chem. Commun. 185-186; (1973) Can. J. Biochem. 51, 1630-1637), 2) the unlabeled trans isomer specifically inhibited the incorporation of radiolabel from proline into the antibiotic, 3) the 14C-hydroxyimino-acid was isolated from the intracellular pool and medium following incubations with L-[14C]proline during antibiotic biosynthesis and when etamycin synthesis was blocked by D-leucine. By means of chromatographic and enzymatic analyses, it was established that the free imino acid possesses the trans-L configuration.
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304
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Katz E, Kamal F, Mason K. Biosynthesis of trans-4-hydroxy-L-proline by Streptomyces griseoviridus. J Biol Chem 1979. [DOI: 10.1016/s0021-9258(18)50423-3] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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305
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Katz E. Ottawa meeting of provincial health/hospital associations. DIMENSIONS IN HEALTH SERVICE 1979; 56:28, 30. [PMID: 34547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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306
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Katz E. Nursing care study: femoral endarterectomy and femoro-popliteal bypass graft. NURSING TIMES 1979; 75:530-5. [PMID: 254115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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307
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Troost T, Katz E. Phenoxazinone biosynthesis: accumulation of a precursor, 4-methyl-3-hydroxyanthranilic acid, by mutants of Streptomyces parvulus. JOURNAL OF GENERAL MICROBIOLOGY 1979; 111:121-32. [PMID: 458423 DOI: 10.1099/00221287-111-1-121] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Mutants of Streptomyces parvulus that are blocked in the synthesis of the phenoxazinone-containing antibiotic, actinomycin, were isolated by the 'agar piece' method (after ultraviolet irradiation or treatment with 8-methoxypsoralen plus near-ultraviolet light). Radiolabelling experiments in conjunction with paper, thin-layer and column chromatography revealed that 4-methyl-3-hydroxyanthranilic acid (MHA) is a major metabolite accumulated by these mutants. Studies in vitro and in vivo provided evidence that MHA is a precursor of the phenoxazinone chromophore, actinocin. Normally MHA does not accumulate during growth or antibiotic synthesis by the parental strains. Protoplasts derived from the mutant strain AM5 synthesized MHA in significant amounts. A scheme is proposed for the biosynthesis of actinomycin D that accounts for the accumulation of MHA by the mutants.
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308
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Katz E. Planning diagnostic imaging services. DIMENSIONS IN HEALTH SERVICE 1979; 56:40. [PMID: 33096] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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309
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Katz E, Schlamowitz S. Savings achieved through cephalosporin surveillance. AMERICAN JOURNAL OF HOSPITAL PHARMACY 1978; 35:1521-3. [PMID: 717407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The process by which a 427-bed, acute-care teaching hospital reduced the cost of cephalosporin therapy is described. During a nine-month surveillance period, cefazolin prescribing patterns were monitored. Of the 674 patients who received cefazolin, 640 (92%) received dosages greater than those recommended in the literature. Attempts were made to alter inappropriate prescribing through pharmacist-physician consultation and through contact with the medical service representative of the company which supplied cefazolin. Because these efforts failed, the pharmacy and therapeutics committee decided to delete cefazolin from the formulary. Cephalothin and cephapirin were found to be clinically similar; therefore, the committee recommended that the less expensive cephapirin be dispensed whenever a parenteral cephalosporin was ordered. Prior to the switch to cephapirin, cefazolin accounted for 49% of all parenteral cephalosporin use and 62% of the cephalosporin cost. Cephalothin and cefazolin were 30% and 88%, respectively, more expensive than cephapirin. In the first year after the switch, the hospital saved $33,196 (28.8% of the previous year's total expenditures for cephalosporins).
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310
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Katz E. Ontario Hospital Association Convention: encouraging patients to donate organs. DIMENSIONS IN HEALTH SERVICE 1978; 55:33-4. [PMID: 33865] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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311
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Ogan K, Katz E, Slavin W. Concentration and Determination of Trace Amounts of Several Polycyclic Aromatic Hydrocarbons in Aqueous Samples. J Chromatogr Sci 1978. [DOI: 10.1093/chromsci/16.11.517] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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312
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Ochi K, Katz E. The possible involvement of a plasmid(s) in actinomycin synthesis by Streptomyces parvulus and Streptomyces antibioticus. J Antibiot (Tokyo) 1978; 31:1143-8. [PMID: 82552 DOI: 10.7164/antibiotics.31.1143] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The treatment of Streptomyces parvulus and Streptomyces antibioticus with acriflavine or novobiocin resulted in the loss of ability to produce actinomycin. The concomitant loss of ability to form aerial mycelium and the incidence of auxotrophic progeny (S. parvulus) were both low relative to the loss of the antibiotic-producing property. Protoplast fusion induced by polyethylene glycol 4000, using suitable auxotrophic strains of S. parvulus, resulted in high recombination frequencies to prototrophy (9.6 approximately 15%). When fusion was carried out between auxotrophic act+ and act- strains, respectively, there was a high frequency (84 approximately 95%) of the actinomycin synthesizing character among the prototrophic recombinants examined. No actinomycin-producing recombinant was detected in similar experiments between auxotrophic non-producing strains.
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313
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Katz E. Biomedical troubleshooters. DIMENSIONS IN HEALTH SERVICE 1978; 55:24, 26. [PMID: 700265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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314
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Katz E, Margalith E, Winer B. Formation of vaccinia virus DNA-protein complex in the presence of isatin beta thiosemicarbazone (IBT). J Gen Virol 1978; 40:695-9. [PMID: 690618 DOI: 10.1099/0022-1317-40-3-695] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
The association of newly synthesized vaccinia virus DNA with proteins in infected HeLa cells was followed. A shift from a high density to a low density complex occurred between 3 and 6 h after infection. This process was not affected by isatin beta thiosemicarbazone (IBT), an inhibitor of pox virus growth. At 22 h after infection in the absence of IBT, mature virions of high density were observed; however, in the presence of the drug, high density DNA-protein complexes, which lack the two main virus core polypeptides, were formed.
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315
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Katz E. Health consciousness ... cost consciousness. DIMENSIONS IN HEALTH SERVICE 1978; 55:38-9. [PMID: 669097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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316
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Abstract
The biosynthesis of a Proteus mirabilis outer membrane protein of molecular weight of approximately 7,000 was found to be relatively resistant to puromycin and rifampin, as is the case for the Escherichia coli liporotein. Furthermore, the existence of the lipoprotein in P. mirabilis was indicated by a comparison of the amino acid compositions of the purified free and bound forms of this protein with those of the E. coli free and bound lipoproteins.
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317
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Katz E. Shared laundry service moves east. DIMENSIONS IN HEALTH SERVICE 1978; 55:32, 34. [PMID: 648758] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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318
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Katz E. Keeping up with infection control. DIMENSIONS IN HEALTH SERVICE 1978; 55:21-2. [PMID: 640292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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319
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Katz E. Flexible scheduling using part-time nurses. DIMENSIONS IN HEALTH SERVICE 1978; 55:18-9. [PMID: 640277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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320
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Katz E, Margalith E, Winer B. Genetic recombination between a temperature sensitive mutant and an isating beta thiosemicarbazone (IBT) resistant mutant of vaccinia virus. J Antimicrob Chemother 1978; 4:159-62. [PMID: 649536 DOI: 10.1093/jac/4.2.159] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
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321
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Movva NR, Katz E, Asdourian PL, Hirota Y, Inouye M. Gene dosage effects of the structural gene for a lipoprotein of the Escherichia coli outer membrane. J Bacteriol 1978; 133:81-4. [PMID: 338599 PMCID: PMC221979 DOI: 10.1128/jb.133.1.81-84.1978] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The gene dosage effects of the structural gene (lpp) for the lipoprotein of the Escherichia coli outer membrane were examined. A novel F-prime factor containing the lpp gene was constructed. The amount of the free-form lipoprotein in the merodiploid strain carrying the F-prime factor was found to be about two times as great as that in the corresponding haploid strain. On the other hand, the amount of the bound-form lipoprotein, which is vovalently linked to the peptidoglycan, was not significantly different in the merodiploid strain as compared with the corresponding haploid strain. The present results suggest that the lpp gene is expressed constitutively in contrast to another major protein of the E. coli outer membrane, tolG protein (protein II, D. B. Datta et al., J. Bacteriol. 128:834-841, 1976). The F-prime factor isolated may include a portion of the E. coli chromosome (located between 33 and 36 min on the genetic map) that is not covered by any other F-prime factor.
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322
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Hitchcock MJ, Katz E. Actinomycin biosynthesis by protoplasts derived from Streptomyces parvulus. Antimicrob Agents Chemother 1978; 13:104-14. [PMID: 75712 PMCID: PMC352192 DOI: 10.1128/aac.13.1.104] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Conditions are described for the formation of protoplasts from Streptomyces parvulus that are able to synthesize actinomycin D de novo. Antibiotic synthesis by protoplasts, in contrast to that by mycelium, was sensitive to inhibition by actinomycin D and to a decrease in sucrose concentration. On the other hand, synthesis by mycelium was much more sensitive to inhibition by amino acid analogs (d-valine, cis-3-methylproline, and alpha-methyl-dl-tryptophan). In addition, the uptake of amino acids (l-methionine, sarcosine, and l- and d-valine) by protoplasts was significantly lower than that by mycelium. The advantages and limitations of using protoplasts for studying in vivo actinomycin synthesis are discussed.
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323
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Klein S, Katz E, Neeman E. Induction of delta-Aminolevulinic Acid Formation in Etiolated Maize Leaves Controlled by Two Light Systems. PLANT PHYSIOLOGY 1977; 60:335-8. [PMID: 16660088 PMCID: PMC542611 DOI: 10.1104/pp.60.3.335] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
A short illumination of etiolated maize (Zea mays) leaves with red light causes a protochlorophyll(ide)-chlorophyll(ide) conversion and induces the synthesis of delta-aminolevulinic acid (ALA) during a subsequent dark period. In leaves treated with levulinic acid, more ALA is formed in the dark than in control leaves. Far red light does not cause a conversion of protochlorophyll(ide) into chlorophyll(ide) and does not induce accumulation of ALA in the dark. Both red and far red preilluminations cause a significant potentiation of ALA synthesis during a period of white light subsequent to the dark period. The results indicate a dual light control of ALA formation. The possible role of phytochrome and protochlorophyllide as photoreceptors in this control system is discussed.
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324
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Farmer R, Schwalb A, Katz E. Navajo project report on subsynchronous resonance analysis and solutions. ACTA ACUST UNITED AC 1977. [DOI: 10.1109/t-pas.1977.32445] [Citation(s) in RCA: 96] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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325
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Loeb LA, Sirover MA, Weymouth LA, Dube DK, Seal G, Agarwal SS, Katz E. Infidelity of DNA synthesis as related to mutagenesis and carcinogenesis. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH 1977; 2:1297-304. [PMID: 886629 DOI: 10.1080/15287397709529531] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An assay system has been developed for measuring the fidelity of DNA synthesis in vitro by using synthetic polynucleotide templates and purified DNA polymerases. Nearest-neighbor analysis of the synthesized product indicates that noncomplementary nucleotides are incorporated as single base substitutions. The accuracy of DNA synthesis can be decreased by (1) prior alkylation of the template, (2) increasing the relative concentration of incorrect nucleotides, and (3) addition of specific metal salts to the reaction mixture. As an initial evaluation of the utility of this system, the effects of 31 metal salts on the fidelity of DNA synthesis have been determined. The results indicate that potential metal mutagens and/or carcinogens may be detected by measuring alterations in the fidelity of DNA synthesis.
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