776
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Jackson M. The role of the university in continuing dental education. ONTARIO DENTIST 1980; 57:30-2. [PMID: 6955725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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777
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Jackson M, Gilkerson W. Additions and Corrections - Ion-Solvent Interaction. Effects of Added Polar Compounds on the Conductances of Several Alkali Metal Salts in 2-Butanone at 25°C. J Am Chem Soc 1979. [DOI: 10.1021/ja00518a601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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778
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Abstract
Cost benefit analyses in the health sector frequently deal with situations in which the money value of the benefits is either difficult or impossible to measure. This paper asserts that the use of cost effectiveness analysis as a means of escaping the need to place a dollar value on benefits does not escape the need for appropriately discounting these benefits when they accrue in different periods over time. The choice of an appropriate discount rate is discussed, and the benefits of elective hysterectomy are used to demonstrate that a serious bias can result from ignoring the need for discounting.
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779
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Kahan JS, Kahan FM, Goegelman R, Currie SA, Jackson M, Stapley EO, Miller TW, Miller AK, Hendlin D, Mochales S, Hernandez S, Woodruff HB, Birnbaum J. Thienamycin, a new beta-lactam antibiotic. I. Discovery, taxonomy, isolation and physical properties. J Antibiot (Tokyo) 1979; 32:1-12. [PMID: 761989 DOI: 10.7164/antibiotics.32.1] [Citation(s) in RCA: 368] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A new beta-lactam antibiotic, named thienamycin, was discovered in culture broths of Streptomyces MA4297. The producing organism, subsequently determined to be a hitherto unrecognized species, is designated Streptomyces cattleya (NRRL 8057). The antibiotic was isolated by adsorption on Dowex 50, passage through Dowex 1, further chromatography on Dowex 50 and Bio-Gel P2, and final purification and desalting on XAD-2. Thienamycin is zwitterionic, has the elemental composition C11H16N2O4S (M.W. = 272.18) and possesses a distinctive UV absorption (lambda max = 297 nm, epsilon = 7,900). Its beta-lactam is unusually sensitive to hydrolysis above pH8 and to reaction with nucleophiles such as hydroxylamine, cysteine and, to a lesser degree, the primary amine of the antibiotic itself. The latter reaction results in accelerated inactivation at high antibiotic concentrations.
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780
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Fleming D, Altini M, Jackson M, Bosman J, Weber Z. The Boksburg Lake suitcase murder. THE JOURNAL OF THE DENTAL ASSOCIATION OF SOUTH AFRICA = DIE TYDSKRIF VAN DIE TANDHEELKUNDIGE VERENIGING VAN SUID-AFRIKA 1979; 34:9-12. [PMID: 296594] [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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781
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Carney RE, McAlpine JB, Jackson M, Stanaszek RS, Washburn WH, Cirovic M, Mueller SL. Modification of seldomycin factor 5 at C-3'. J Antibiot (Tokyo) 1978; 31:441-50. [PMID: 670086 DOI: 10.7164/antibiotics.31.441] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Attempted removal of the 3'-hydroxyl group of seldomycin factor 5 via displacement of a sulfonate ester has led to 3'-epi-seldomycin factor 5. Removal of the hydroxyl group has been effected by the Barton procedure. The antibacterial activity of 3'-epi- and 3'-deoxyseldomycin factor 5 against various aminoglycoside-resistant strains is discussed.
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782
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Jackson M. Rape and abortion. THE NEW ZEALAND MEDICAL JOURNAL 1977; 86:301-2. [PMID: 272533] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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783
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Wasan D, Wnek W, Davies R, Jackson M, Kaye B. Analysis and evaluation of permeability techniques for characterizing fine articles. POWDER TECHNOL 1977. [DOI: 10.1016/0032-5910(77)85036-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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784
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Forth MW, Jackson M. Group psychotherapy in the management of bronchial asthma. THE BRITISH JOURNAL OF MEDICAL PSYCHOLOGY 1976; 49:257-60. [PMID: 990200 DOI: 10.1111/j.2044-8341.1976.tb02372.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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785
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Jackson M. Psychopathology and psychotherapy in bronchial asthma. THE BRITISH JOURNAL OF MEDICAL PSYCHOLOGY 1976; 49:249-55. [PMID: 990199 DOI: 10.1111/j.2044-8341.1976.tb02371.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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786
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Wasan D, Kaye B, Wnek W, Davies R, Jackson M. Analysis and evaluation of permeability techniques for characterizing fine particles Part I. Diffusion and flow through porous media. POWDER TECHNOL 1976. [DOI: 10.1016/0032-5910(76)80071-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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787
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Wasan D, Ranade M, Sood S, Davies R, Jackson M, Kaye B, Wnek W. Analysis and evaluation of permeability techniques for characterizing fine particles Part II. Measurement of specific surface area. POWDER TECHNOL 1976. [DOI: 10.1016/0032-5910(76)80072-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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788
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Jackson M. Case study: quadruplets. MIDWIVES CHRONICLE 1976; 89:121-3. [PMID: 1047178] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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789
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Lawrence CW, Sherman F, Jackson M, Gilmore RA. Mapping and gene conversion studies with the structural gene for iso-1-cytochrome C in yeast. Genetics 1975; 81:615-29. [PMID: 174970 PMCID: PMC1213424 DOI: 10.1093/genetics/81.4.615] [Citation(s) in RCA: 31] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
We have investigated the order of the four genes cyc1, rad7, SUP4, and cdc8 which form a tightly linked cluster on the right arm of chromosome X in the yeast Saccharomyces cerevisiae. Crossing over and coconversion data from tetrad analysis established the gene order to be centromere-cyc1-rad7-SUP4. Also cdc8 appeared to be distal to SUP4 on the basis of crossovers that were associated with conversion of SUP4. The frequencies of recombination and the occurrence of coconversions suggest that these four genes are contiguous or at least nearly so. Gene-conversion frequencies for several cyc1 alleles were studied, including cyc1-1, a deletion of the whole gene that extends into the rad7 locus. The cyc1-1 deletion was found to be capable of conversion, though at a frequency some fivefold less than the other alleles studied, and both 3:1 and 1:3 events were detected. In general 1:3 and 3:1 conversion events were equally frequent at all loci studied, and approximately 50% of conversions were accompanied by reciprocal recombination for flanking markers. The orientation of the cyc1 gene could not be clearly deduced from the behavior of the distal marker SUP4 in wild-type recombinants that arose from diploids heteroallelic for cyc1 mutations.
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790
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Sherman F, Jackson M, Liebman SW, Schweingruber AM, Stewart JW. A deletion map of cyc1 mutants and its correspondence to mutationally altered iso-1-cytochromes c of yeast. Genetics 1975; 81:51-73. [PMID: 173620 PMCID: PMC1213389 DOI: 10.1093/genetics/81.1.51] [Citation(s) in RCA: 41] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Mutants arising spontaneously from sporulated cultures of certain strains of yeast, Saccharomyces cerevisiae, contained deletions of the CYC1 gene which controls the primary structure of iso-1-cytochrome c. At least 60 different kinds of deletions were uncovered among the 104 deletions examined and these ranged in length from those encompassing only two adjacent point mutants to those encompassing at least the entire CYC1 gene. X-ray-induced recombination rates of crosses involving these deletions and cyc1 point mutants resulted in the assignment of 211 point mutants to 47 mutational sites and made it possible to unambiguously order 40 of these 47 sites. Except for one mutant, cyc1-15, there was a strict colinear relationship between the deletion map and the positions of 13 sites that were previously determined by amino acid alterations in iso-1-cytochromes c from intragenic revertants.
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791
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Mason JM, Mason LH, Jackson M, Bell JS, Francisco JT, Jennings BR. Letter: Pulmonary vessels in SIDS. N Engl J Med 1975; 292:479. [PMID: 1113831] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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792
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Sherman F, Stewart JW, Jackson M, Gilmore RA, Parker JH. Mutants of yeast defective in iso-1-cytochrome c. Genetics 1974; 77:255-84. [PMID: 4367877 PMCID: PMC1213128 DOI: 10.1093/genetics/77.2.255] [Citation(s) in RCA: 155] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
A medium containing chlorolactate has been devised to enrich for mutants that are unable to utilize lactate for growth, and therefore that may be defective in cytochrome c. Complementation tests of 6,520 chlorolactate-resistant mutants that were obtained spontaneously or induced with UV, ICR-170, or nitrosoimidazolidone resulted in the identification of 195 mutations at the cyc1 locus, which controls the primary structure of iso-1-cytochrome c. These 195 mutants, with 16 cyc1 mutants previously isolated, were examined for total cytochrome c by spectroscopic methods, growth on lactate medium, suppressibility by defined nonsense suppressors, mutational sites by x-ray-induced recombination, ability to revert, and in 86 cases, whether intragenic revertants contain altered iso-1-cytochrome c. Except for the deletion mutant cyc1-1, all of the mutants appeared to contain single-site mutations that could be assigned to at least 35 different sites within the gene. The cyc1 mutants either completely lacked iso-1-cytochrome c or contained iso-1- cytochromes c that were completely or partially nonfunctional. In spite of the fact that the cyc1 mutants obtained by the chlorolactate procedure were selected on the basis of defective function, 68% appeared to completely lack iso-1-cytochrome c. The remaining cyc1 mutants contained below normal amounts of iso-1-cytochromes c. Studies at several incubation temperatures indicated that these nonfunctional iso-1-cytochromes c were thermolabile. It is suggested that the predominant means for abolishing iso-1-cytochrome c by mutations are either through a complete loss, such as produced by chain terminating codons, or impairments through drastic changes of tertiary structure which lead to instability and thermolability.
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793
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Gold H, Jackson M, Sachs B, Van Meter MJ. Peer review--a working experiment. Nurs Outlook 1973; 21:634-6. [PMID: 4492798] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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794
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Sherman F, Liebman SW, Stewart JW, Jackson M. Tyrosine substitutions resulting from suppression of amber mutants of iso-1-cytochrome c in yeast. J Mol Biol 1973; 78:157-68. [PMID: 4354344 DOI: 10.1016/0022-2836(73)90435-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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795
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Abstract
The aggregation of ribosomal RNA species during chromatography on methylated albumin on kieselguhr was decreased from 50 to 15% by the lower salt concentrations made possible by the use of higher pH values. The polydisperse RNA was resolved into two fractions. About 50% was eluted with the rRNA whereas the remainder was bound to the column, and was recovered only by solubilization of the methylated albumin. Both fractions of polydisperse RNA were similar in size range, but the bound fraction was considerably richer in AMP. No D-RNA (DNA-like RNA) peak was resolved under these conditions of column fractionation. However, the properties of the bound RNA were consistent with it containing both D-RNA and TB-RNA (tenaciously bound RNA). The relationship between these two fractions of AMP-rich RNA was considered. The bound RNA and ribosomal RNA responded differently to various treatments. The salt concentration required to elute ribosomal RNA was halved by increasing the pH of the fractionation, but the amount of bound RNA was in fact increased. Denaturation by hot urea decreased the binding of ribosomal RNA to the methylated albumin, but did not facilitate elution of bound RNA. The high affinity between the AMP-rich polydisperse RNA and the methylated albumin does not therefore appear to arise for the secondary structure conferred by the high AMP content.
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796
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Jackson M, Ingle J. The interpretation of studies on rapidly labeled ribonucleic Acid in higher plants. PLANT PHYSIOLOGY 1973; 51:412-4. [PMID: 16658343 PMCID: PMC366278 DOI: 10.1104/pp.51.2.412] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
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797
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Jackson M. Integration of psychosomatic medicine in a teaching hospital. Experiences with a discussion seminar. PSYCHOTHERAPY AND PSYCHOSOMATICS 1973; 22:205-18. [PMID: 4770531 DOI: 10.1159/000286524] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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798
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Jackson CG, Holcomb CM, Jackson M. Strontium-90 in the exoskeletal ossicles of Dasypus novemcinctus. J Mammal 1972; 53:921-2. [PMID: 4654247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
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799
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Stapley EO, Jackson M, Hernandez S, Zimmerman SB, Currie SA, Mochales S, Mata JM, Woodruff HB, Hendlin D. Cephamycins, a new family of beta-lactam antibiotics. I. Production by actinomycetes, including Streptomyces lactamdurans sp. n. Antimicrob Agents Chemother 1972; 2:122-31. [PMID: 4790552 PMCID: PMC444278 DOI: 10.1128/aac.2.3.122] [Citation(s) in RCA: 101] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
A number of actinomycetes isolated from soil were found to produce one or more members of a new family of antibiotics, the cephamycins, which are structurally related to cephalosporin C. The cephamycins were produced in submerged fermentation in a wide variety of media by one or more of eight different species of Streptomyces, including a newly described species, S. lactamdurans. These antibiotics exhibit antibacterial activity against a broad spectrum of bacteria which includes many that are resistant to the cephalosporins and penicillins.
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800
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Stewart JW, Sherman F, Jackson M, Thomas FL, Shipman N. Demonstration of the UAA ochre codon in bakers yeast by amino-acid replacements in iso-1-cytochrome c. J Mol Biol 1972; 68:83-96. [PMID: 5050363 DOI: 10.1016/0022-2836(72)90264-1] [Citation(s) in RCA: 55] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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