2101
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Ullman B, Lee M, Martin DW, Santi DV. Cytotoxicity of 5-fluoro-2'-deoxyuridine: requirement for reduced folate cofactors and antagonism by methotrexate. Proc Natl Acad Sci U S A 1978; 75:980-3. [PMID: 147465 PMCID: PMC411383 DOI: 10.1073/pnas.75.2.980] [Citation(s) in RCA: 119] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Protein in vitro inhibition of thymidylate synthase (5,10-methylenetetrahydrofolate:dUMP C-methyltransferase, EC 2.1.1.45) by 5-fluoro-2'-deoxyuridylate requires 5,10-methylenetetrahydrofolate. The cytoxicity of 5-fluoro-2'-deoxyuridine towards cultured L1210 mouse leukemia cells is reduced when intracellular reduced folates are depleted, either by limiting the source in media or by inhibition of dihydrofolate reductase with methotrexate. Likewise, the intracellular amount of 5-fluoro-2'-deoxyuridylate covalently bound to thymidylate synthase in L1210 cells treated with 5-fluoro-2'-deoxyuridine is greatly diminished when cells are depleted of folate cofactors. The folate requirement for optimal growth of L1210 cells is lower than that required for maximal cytotoxicity of 5-fluoro-2'-deoxyuridine. These findings provide a biochemical rationale that may be useful in designing clinical protocols that use 5-fluorinated uracil analogs.
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2102
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Sarubbi FA, Wilson B, Lee M, Brokopp C. Nosocomial meningitis and bacteremia due to contaminated amphotericin B. JAMA 1978; 239:416-8. [PMID: 413939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Nosocomial Gram-negative bacillary meningitis and bacteremia occurred in a patient who was receiving intrathecal and intravenous amphotericin B. An epidemiologic investigation found the amphotericin B to be contaminated with Enterobacter agglomerans, Pseudomonas fluorescens, and P aeruginosa. These contaminants were traced to a lot ot sodium phosphate buffer that was added to all intrathecal and intravenous amphotericin B preparations. The phosphate buffer underwent prolonged storage at room temperature and was not subject to terminal sterilization nor sterility testing. This parenteral admixture prepared in the hospital is now steam autoclaved and sterility tested before use.
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2103
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Leichter J, Angel JF, Lee M. Nutritional status of a select group of free-living elderly people in Vancouver. CANADIAN MEDICAL ASSOCIATION JOURNAL 1978; 118:40-3. [PMID: 620382 PMCID: PMC1880446] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A study was conducted to determine the nutritional status of the free-living elderly population in Vancouver. The response rate of the sample was low. Dietary information from 104 single men and women and 23 couples was collected by the 24-hour recall method. Biochemical tests in 56 single individuals and 13 couples included measurement of hemoglobin concentration and hematocrit, plasma analysis for concentrations of total protein, iron, carotene, vitamin A, ascorbic acid, vitamin E and cholesterol and for transferrin saturation, and urine analysis for concentrations of creatinine, thiamin, riboflavin and N(1)-methylnicotinamide.Mean energy intakes were considerably below the Dietary Standard for Canada. However, mean intakes of individual nutrients were similar to or in excess of the Dietary Standard for Canada for single men and women and for married men. Married women had low average intakes of calcium, iron, thiamin and riboflavin but adequate intakes of other nutrients. Mean values for biochemical variables were within the accepted range as defined by the Interdepartmental Committee of Nutrition for National Defense in the United States. According to the Nutrition Canada definitions of "high risk" there were no individuals in high-risk categories for any biochemical variable except plasma cholesterol concentration and transferrin saturation. The dietary and biochemical data indicated that the nutritional status in this select group of elderly persons was good except for intake of total energy and, in married women, of calcium, iron, thiamin and riboflavin.
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2104
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Jahng JS, Lee M, Park BM, Chung IH. Clinical observation on skeletal tuberculosis. Yonsei Med J 1978; 19:89-95. [PMID: 753043 DOI: 10.3349/ymj.1978.19.2.89] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
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2105
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Smith JE, Mahaffey E, Lee M. Effect of Methylene Blue on glutamate and reduced glutathione of rabbit erythrocytes. Biochem J 1977; 168:587-9. [PMID: 606257 PMCID: PMC1183811 DOI: 10.1042/bj1680587] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Methylene Blue injected into rabbits resulted in increased glutamate, reduced glutathione and pyrrolid-2-one-5-carboxylate in erythrocytes. The increase in reduced glutathione was probably due to increased glutamate changing the feedback control of glutathione on gamma-glutamylcysteine synthetase.
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2106
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Lee M, Birkbeck JA. Anthropometric measurements and physical examinations of Indian populations from British Columbia and the Yukon Territories, Canada. Hum Biol 1977; 49:581-91. [PMID: 590956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2107
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Winter GP, Hartley BS, McLachlan AD, Lee M, Muench KH. Sequence homologies between the tryptophanyl tRNA synthetases of Bacillus stearothermophilus and Escherichia coli. FEBS Lett 1977; 82:348-50. [PMID: 334569 DOI: 10.1016/0014-5793(77)80618-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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2108
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Blecvins RD, Lee M, Regan JD. Mutagenicity screening of five methyl carbamate insecticides and their nitroso derivatives using mutants of Salmonella typhimurium LT2. Mutat Res 1977; 56:1-6. [PMID: 339072 DOI: 10.1016/0027-5107(77)90234-2] [Citation(s) in RCA: 48] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The mutagenic activity of five methyl carbamate insecticides-carbaryl, baygon, BUX-Ten, landrin and methomyl-and their nitroso derivatives were investigated using histidine auxotrophs-his TA98, his TA100, his TA1535, his TA1537 and his TA1538--of Salmonella typhimurium LT2 derived by Ames. The methyl carbamate insecticides did not cause a signficant increase in the number of revertant colonies in any of the strains used. In contrast, the nitroso derivatives of the carbamate insecticides greatly increased the number of colonies on plates inoculated with strains his TA100 and his TA1535. We conclude that the nitroso derivatives of the tested methyl carbamate insecticides are potent mutagens; whereas, the parent insecticides are non-mutagenic.
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2109
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Abstract
The recurring dilemma of having to deal with an intoxicated person in possession of a gun uttering homicidal or suicidal threats along with the current debate on gun control prompted this controlled survey of the characteristics of individuals with problems arising from the joint abuse of alcohol and possession of a gun. A comparison of the data point to violence as being the most significant differentiating variable involved. This violent potential was reflected by the presence among the alcoholics involved of more past and present antisocial traits, a higher rating on the Nicol's scale of violence, more offences committed against the person and homicidal behaviour. The availability of a gun was a significant factor. No correlation was found between the severity of the drinking problem and the risk of dangerous handling of a gun. The need for more stringent gun controls is supported but their implications to the physician and especially the psychiatrist as a potential guarantor for a licence application ought to be further explored by the professional bodies involved.
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2110
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Williams JA, Poulsen JH, Lee M. Effects of membrane stabilizers on pancreatic amylase release. J Membr Biol 1977; 33:185-95. [PMID: 325208 DOI: 10.1007/bf01869515] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Compounds with membrane stabilizing activity were studied as to their ability to affect pancreatic amylase release and the steps in the stimulus-secretion coupling process. Chlorpromazine, propranolol, and thymol were all found to inhibit bethanechol-stimulated amylase release and at slightly higher concentrations to induce release regardless of the presence of the secretagogue. This biphasic effect was similar to that found previously for the local anesthetic tetracaine. Release by high concentrations of propranolol and tetracaine was accompained by ultrastructural evidence of cell damage. Membrane stabilizers at concentrations which inhibited amylase release were shown to block bethanechol-induced depolarization and stimulation of 45Ca++ efflux although the drugs alone partially depolarized pancreatic cells. Release of amylase induced by Ca++ introduced by the ionophore A23187 was also abolished. The findings indicate that membrane stabilizers independently inhibit the steps leading to a rise in intracellular Ca++ and the subsequent Ca++-activated amylase release.
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2111
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Oxender DL, Lee M, Moore PA, Cecchini G. Neutral amino acid transport systems of tissue culture cells. J Biol Chem 1977; 252:2675-9. [PMID: 853037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
We have studied the interactions among a varied group of neutral amino acids for uptake into two different animal tissue culture cell lines. 3T3 mouse cells and Chinese hamster ovary cells were used in these studies. The results showed that the affinities of the amino acids clustered into two groups, one including amino acids such as glycine, alanine, and alpha-aminoisobutyric acid and the other group included amino acids such as leucine and phenylalanine. The specificities and properties of these systems are similar to those described earlier for the Ehrlich ascites cell, System A (alanine-preferring) and System L (leucine-preferring). System A is highly concentrative, sensitive to sodium ion, and serves only poorly for exchange while System L is not very concentrative or sensitive to alkali metal ion, although it serves very well for exchange with endogenous amino acids. The kinetic parameters for several amino acids are reported and other properties of the transport systems are discussed.
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2112
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Oxender DL, Lee M, Cecchini G. Regulation of amino acid transport activity and growth rate of animal cells in culture. J Biol Chem 1977; 252:2680-3. [PMID: 856799] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Balb/3T3 mouse cells grown in cell culture contain the A and L systems for neutral amino acid transport. L-Alanine was used as a test amino acid for the A system and L-leucine for the L system. Transport activities for both transport systems are altered as the growth conditions for the cells are altered. When cell growth was arrested by allowing cells to approach confluency, or by the removal of serum or by the addition of protein synthesis inhibitors, System A transport activity decreased and System L activity increased significantly. The content of the cellular amino acids increased 2- to 3-fold whenever cell growth was arrested by the conditions stated above. Increased cellular amino acids, therefore, are associated with decreased transport activity of System A and increased activity of System L. Altering cellular amino acids by loading or depleting the cells produced the predicted responses for the rapidly exchanging L-system but System A was less responsive. It is possible that regulatory mechanisms operate for the A system other than the direct action of alterations in cellular amino acid levels. The implications of the amino acid transport activity changes observed here on various studies on the role of transport in cell growth regulation and malignant transformation are discussed.
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2113
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Feldman F, Lee M. An eye screening program in a Chinese-Canadian community. CANADIAN JOURNAL OF OPHTHALMOLOGY 1977; 12:121-3. [PMID: 880511] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A screening program staffed by ophthalmologists, ophthalmology residents, ophthalmic assistants, social workers and Chinese-speaking volunteers and directed at a Chinese immigrant community, was conducted at the Mount Sinai Hospital, Toronto. The Chinese population had been hesitant to use our hospital facilities and we hoped to overcome their fears, as well as to detect previously undiagnosed ocular problems. The program succeeded in finding many eye problems, some serious, and in encouraging this immigrant group to come for proper medical care. We describe the method of setting up and conducting such an undertaking, which involved the Departments of Ophthalmology and Social work, hospital administrators and volunteers from the community.
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2114
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Oxender DL, Lee M, Moore PA, Cecchini G. Neutral amino acid transport systems of tissue culture cells. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(17)40511-4] [Citation(s) in RCA: 59] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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2115
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Oxender DL, Lee M, Cecchini G. Regulation of amino acid transport activity and growth rate of animal cells in culture. J Biol Chem 1977. [DOI: 10.1016/s0021-9258(17)40512-6] [Citation(s) in RCA: 71] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
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2116
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Edwards AJ, Lee M, Harcourt G. Serum immunoglobulins and C3 complement concentrations in malignancy. Clin Oncol (R Coll Radiol) 1977; 3:65-73. [PMID: 862277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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2117
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Goldenberg GJ, Lee M, Lam HY, Begleiter A. Evidence for carrier-mediated transport of melphalan by L5178Y lymphoblasts in vitro. Cancer Res 1977; 37:755-60. [PMID: 837375] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Mechanism of transport of the alkylating agent [14C]melphalan was investigated in L5178Y lymphoblasts in vitro. A time course of melphalan uptake was approximately linear for 5 to 10 min and thereafter entered a plateau region. Evidence that unidirectional influx of melphalan is carrier mediated was that uptake obeyed simple Michaelis-Menten kinetics, that it demonstrated chemical specificity, and that the cell/medium distribution ratio of drug decreased with increasing extracellular drug concentration. The kinetic parameters for melphalan transport consisted of a Km (mean +/- S.E.) of 1.53 +/- 0.18 X 10(-4) M and a transport capacity (Vmax) of 3.48 +/- 0.31 X 10(-17) mole/min/cell. Findings suggesting that transport was at least in part energy dependent and not simply a passive process were that drug uptake was temperature sensitive and sodium dependent. Analysis of cell sap constituents indicated the presence of intact drug within the cell. The percentage of radioactivity (mean +/- S.D.) found in the cell sap fraction was 95.8 +/- 2.2% of total cell activity, and 92.6 +/- 4.1% of this was trichloroacetic acid soluble. Thin-layer chromatography of the cell sap fraction and medium each revealed that the majority of radioactivity migrated as a single peak with an RF value identical with that obtained for free drug. The alkylating potential of intact drug complicated interpretation of the finding of apparent uphill transport against a concentration gradient. This observation, together with the relatively low cell-medium ratio (mean +/- S.D.) of 3.07 +/- 1.07, favors the concept that melphalan transport occurs by a facilitated diffusion process, although an active transport system has not been entirely excluded. The relative insensitivity of melphalan uptake to a wide range of metabolic inhibitors also suggests that transport is by a facilitated diffusion mechanism rather than an active process. Other alkylating agents and several amino acids including the L and D isomers of phenylalanine did not inhibit melphalan transport; thus a native substrate was not identified for the melphalan carrier and transport was by a mechanism separate from that of other alkylating agents.
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2118
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Allan TN, Willson RA, Lee M. Bronchial carcinoma with autovagotomy and bezoar formation. JAMA 1977; 237:364-5. [PMID: 576170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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2119
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Canoy NR, Lee M. Epidermoid carcinoma of the skin of the head and neck. MISSOURI MEDICINE 1976; 73:669-72. [PMID: 1004478] [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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2120
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Abstract
The effects of vinblastine and colchicine on pancreatic acinar cells were studied by use of in vitro mouse pancreatic fragments. Vinblastine inhibited the release of amylase stimulated by bethanechol, caerulein, or ionophore A23187. Inhibition required preincubation with vinblastine,and maximum inhibition was observed after 90 min. Inhibition was relatively irreversible and could not be overcome by a high concentration of stimulant. Inhibition could also be produced by colchicine although longer preincubation was required and inhibition was only partial. Uptake of [3H]vinblastine and [3H]colchicine by pancreatic fragments was measured and found not to be responsible for the slow onset of inhibition by these drugs. In incubated pancreas, microtubules were present primarily in the apical pole of the cell and in association with the Golgi region. Vinblastine, under time and dose conditions that inhibited the release of stimulated amylase, also reduced the number of microtubules. The only other consistent structural effects of vinblastine were the presence of vinblastine-induced crystals and an increased incidence of autophagy. The remainder of cell structure was not affected nor were overall tissue ATP and electrolyte contents or the stimulant-induced increase in 45Ca++ efflux. It is concluded that the antisecretory effects of vinblastine and colchicine are consistent with a microtubular action, but that acinar cell microtubules are more resistant to the drugs than many other cell types.
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2121
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Dische S, Saunders MI, Lee M, Bennett MH. Cigarette smoking and cancer of bladder and lung. BRITISH MEDICAL JOURNAL 1976; 2:1174-5. [PMID: 990829 PMCID: PMC1689550 DOI: 10.1136/bmj.2.6045.1174] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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2122
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Smith JE, Lee M, Agar NS, Ou D. Oxygen-hemoglobin equilibrium of normal and glutathione-deficient sheep. Am J Vet Res 1976; 37:1135-7. [PMID: 984537] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The affinity of hemoglobin for oxygen did not differ significantly between normal and glutathione-deficient sheep. Although phlebotomy in sheep of both types did not significantly alter the partial pressure values at which hemoglobin is 50% saturated with oxygen, it did increase significantly the erythrocyte glutathione and 2,3-diphosphoglycerate (GSH) and (DPG) concentrations. Because DPG does not bind to sheep hemoglobin, its increase in hypoxic sheep must mean DPG is metabolically controlled in the absence of physiologic effect.
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2123
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Smith JE, Lee M. How phlebotomy affects the erythrocyte metabolism of high- and low-glutathione sheep. Res Vet Sci 1976; 21:127-31. [PMID: 968180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Erythrocyte glutathione concentration increases dramatically in low-glutathione sheep of the Finnish-Landrace breed. To determine if this phenomenon occurs in low-glutathione sheep of the Corriedale or Merino type, the packed cell volume was decreased to less than 16 by phlebotomy. Glutathione concentrations increased in high- and low-glutathione sheep. Low-glutathione sheep returned to pre-phlebotomy levels by the 18th day; high-glutathione sheep increased, then decreased below pre-phlebotomy levels for the duration of the experiment. Packed cell volumes increased linearly (1-07 per cent per day) for 19 days. The maximum reticulocyte percentage (11-4) occurred on the eight day. Some erythrocyte enzymes increased as the mean cell age decreased, but some did not change. Erythrocyte adenosine-5'-triphosphate and creatine appear to be related to the reticulocyte count.
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2124
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Smith J, Lee M. How phlebotomy affects the erythrocyte metabolism of high- and low-glutathione sheep. Res Vet Sci 1976. [DOI: 10.1016/s0034-5288(18)33360-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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2125
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Lee M, Miller RC, Scraba D, Paetkau V. The essential role of bacteriophage T7 endonuclease (gene 3) in molecular recombination. J Mol Biol 1976; 104:883-8. [PMID: 785017 DOI: 10.1016/0022-2836(76)90189-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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2126
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Abstract
Lean male and female subjects who had been taking their meals as usual were given a 100 ml drink of starch immediately before a sandwich lunch. In the training phase,65 per cent starch was given before lunches which included a yoghurt-based dessert of one flavour and 5 per cent starch was given before another flavour. Subjects who initially ate lunches of similar size following the two drinks began after several pairings to take larger lunches following dilute starch than following concentrated starch. In extinction tests, identical 35 per cent starch drinks were given before lunches including desserts of either flavour. Lunches including the flavour hitherto paired with dilute starch remained larger than lunches including the other flavour, at least initially in extinction. Some of the difference in intake occurred in the dessert itself. None was attributable to differences in the early stage of the lunches. These results extend to man recent demonstrations that the satisfying power of a foodstuff is in part acquired by association of its sensory characteristics with some consequence of ingesting the nutrients which are consistently taken with or in that food. This consequence may be rapid intestinal absorption of glucose during or shortly after sensory input. The nature of the intake-suppressing response remains to be determined.
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2127
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Yang NY, Macdonald IB, Desai ID, Lee M. Vitamin E supplementation and glutathione peroxidase activity. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1976; 151:770-4. [PMID: 1265062 DOI: 10.3181/00379727-151-39304] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Both excess dietary vitamin E and vitamin E deficiency in rats can significantly depress the activity of GSH peroxidase in liver and plasma of rats. Of all the six levels of vitamin E tested in this study, the dietary level of vitamin E found to maintain the maximum activity of GSH peroxidase in tissues of rats was somewhere between 25 and 250 IU/kg diet. This study conclusively indicates that the excess dietary vitamin E represses GSH peroxidase activity.
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2128
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Smith JE, Lee M. Estimating erythrocyte glyceraldehyde-3-phosphate dehydrogenase by a new method. Res Vet Sci 1976; 20:231-2. [PMID: 1265366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
A semi-quantitative fluorimetric assay for glyceraldehyde-3-phosphate dehydrogenase has been described. This method was applied to a number of animal species and correlates well with the standard spectrophotometric method.
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2129
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Miller RC, Lee M. The role of bacteriophage T7 exonuclease (gene 6) in genetic recombination and production of concatemers. J Mol Biol 1976; 101:223-34. [PMID: 772218 DOI: 10.1016/0022-2836(76)90374-0] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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2130
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Lapierre YD, Lee M. Piperacetazine in the treatment of mixed neurotics. CURRENT THERAPEUTIC RESEARCH, CLINICAL AND EXPERIMENTAL 1976; 19:105-9. [PMID: 1209] [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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2131
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Arthur NL, Lee M. Reactions of methyl radicals. I. Hydrogen abstraction from dimethyl sulphide. Aust J Chem 1976. [DOI: 10.1071/ch9761483] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Hydrogen abstraction from
(CH3),S and CH3COCH3 by CH3
radicals
CH3+CH3SCH3 → CH4+CH3SCH2
CH3 + CH3COCH3 → CH4 +
CH3COCH2
has been studied in the
temperature range 120-245�. The rate constants, based on the value of 1013.34cm3
mol-l s-1 for the recombination of CH3
radicals, are given by (k in cm3 mol-1 s-1, E
in kJ mol-1, R = 0.008314 kJ K-1 mol-1):
logk1 = (11.62 �
0.08) ? (38.35 � 0.68)/2.303RT
logk3 = (11.61 �
0.05) ? (40.48 � 0.46)/2.303RT
Combination of the results
for (1) with thermochemical data gives a calculated value of
Logk-1 = (11.8
-63.7/2.303RT
for the rate constant of
the reverse reaction. The results for CH3+(CH3)2S
are compared with all of the available data for hydrogen abstraction by free
radicals from both sulphur-containing compounds, and
molecules of the type (CH3)xM.
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2132
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Cecchini G, Lee M, Oxender DL. Transport of amino acids in intact 3T3 and SV3T3 cells. Binding activity for leucine in membrane preparations of ehrlich ascites tumor cells. JOURNAL OF SUPRAMOLECULAR STRUCTURE 1976; 4:441-7. [PMID: 180354 DOI: 10.1002/jss.400040403] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Transport of amino acids into 3T3 and SV3T3 (SV40 virus-transformed 3T3) cells was measured on glass cover slips. The 3T3 and SV3T3 cells contain both A (alanine preferring) and L (leucine prefferring) systems for neutral amino acid transport. Initial rates of uptake of amino acids are about twofold higher in SV3T3 than in 3T3 cells. Other parameters measured, however, do not indicate marked differences in the transport of amino acids by the two cell types. L-system amino acids, such as leucine, are subject to trans-stimulation in both cell lines, whereas A-system amino acids, such as alanine and glycine, are not. Leucine was transported to higher levels in confluent cells than in nonconfluent cells. Glycine, however, shows distinctly less transport activity as the cells become confluent. Ehrlich ascites cell plasma membranes were prepared and assayed for amino acid-binding activity. Leucine-binding activity was detected by equilibrium dialysis in Triton X-100-treated membrane preparations.
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2133
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Tze WJ, Lee M. Adverse effects of maternal alcohol consumption on pregnancy and foetal growth in rats. Nature 1975; 257:479-80. [PMID: 1178047 DOI: 10.1038/257479a0] [Citation(s) in RCA: 122] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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2134
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Lee M, Ricketts S, Stockbridge H. Ergonomics within the civil aviation authority. APPLIED ERGONOMICS 1975; 6:171-172. [PMID: 15677183 DOI: 10.1016/0003-6870(75)90019-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
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2135
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Koozekanani SH, Lubow M, Bailin L, Lee M, Lac M. Effect of argon laser on proteolytic enzymes within the bovine vitreous. ANNALS OF OPHTHALMOLOGY 1975; 7:765-8. [PMID: 1170804] [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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2136
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Lee M, Robbins JC, Oxender DL. Transport properties of merodiploids covering the dagA locus in Escherichia coli K-12. J Bacteriol 1975; 122:1001-5. [PMID: 1097389 PMCID: PMC246152 DOI: 10.1128/jb.122.3.1001-1005.1975] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
A membrane componenet of the dag transport system which serves for glycine, D-alanine, and D-serine is coded for by the dagA gene at minute 83 of the Escherichia coli chromosome. Merodiploid strains (dagA+/dagA+) show two to three times the transport activity for only those amino acids that are substrates of the dag transport system. The increased transport activity is a result of a two-to threefold increase in Vmax for amino acid uptake with little or no change in the Km value. The two- to threefold gene dose effect of the merodiploid strains is maintained even during carbon starvation, eliminating the possibility that a greater energy supply for transport activity may account for the effect. Since merodiploids which carry more than one copy of the dagA allele show a gene dose response for transport activity, we conclude that the membrane componenet of the dag transport system which is coded for by the dagA allele is present in limiting amounts.
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2137
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Muench KH, Lipscomb MS, Lee M, Kuehl GV. Homologous cysteine-containing sequences in tryptophanyl-tRNA synthetases from Escherichia coli and human placentas. Science 1975; 187:1089-91. [PMID: 1090002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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2138
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Lee M, Lekias J, Gubbay SS, Hurst PE. Spinal cord compression by extradural fat after renal transplantation. Med J Aust 1975; 1:201-3. [PMID: 1092979 DOI: 10.5694/j.1326-5377.1975.tb111328.x] [Citation(s) in RCA: 130] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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2139
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Lee M. Letter: Barton's forceps. Med J Aust 1975; 1:182. [PMID: 1128392] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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2140
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Alfred BM, Lee M, Desai ID. A relationship between plasma cholesterol level, latitude, and the Rhesus blood group system. Hum Biol 1974; 46:641-6. [PMID: 4216563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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2141
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Abstract
The role of T7-induced exonuclease (gene 6) in molecular recombination was studied by examining the fate of parental DNA during parental-to-progeny recombination. The method used was to compare infections with T7(+), T7am-6-233 (am gene 6), or T7ts6-136 (ts gene 6) under permissive and nonpermissive conditions. CsCl density gradient analysis of replicative DNA indicated that T7 exonuclease is necessary for recombination to occur, i.e., in the absence of the exonuclease the parental DNA replicated continuously as a hybrid molecule and did not recombine. Further studies under conditions where replicative DNA was denatured and analyzed by CsCl density gradient centrifugation indicated that the exonuclease is also needed for a limited amount of covalent repair of recombinants. A repair function for the T7-induced exonuclease is also suggested by results obtained from alkaline sucrose gradient analysis of replicative DNA. Under conditions nonpermissive for the exonuclease, discontinuities in the DNA accumulated during infection by T7am6-233 or by T7ts6-136.
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2142
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Williams JA, Lee M. Pancreatic acinar cells: use of Ca++ ionophore to separate enzyme release from the earlier steps in stimulus-secretion coupling. Biochem Biophys Res Commun 1974; 60:542-8. [PMID: 4423699 DOI: 10.1016/0006-291x(74)90274-5] [Citation(s) in RCA: 77] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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2143
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Desai ID, Lee M. Nutritional status of canadian indians: I. Biochemical studies at Upper Laird and Ross River, the Yukon Territory. CANADIAN JOURNAL OF PUBLIC HEALTH = REVUE CANADIENNE DE SANTE PUBLIQUE 1974; 65:369-74. [PMID: 4447916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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2144
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Teoh JI, Lee M. Psychogenic impotence: its aetiology, characteristics and treatment by systematic desensitization. Singapore Med J 1974; 15:132-8. [PMID: 4415368] [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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2145
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Desai ID, Lee M. Vitamin E status of Indians of Western Canada. CANADIAN JOURNAL OF PUBLIC HEALTH = REVUE CANADIENNE DE SANTE PUBLIQUE 1974; 65:191-6. [PMID: 4840128] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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2146
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2147
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Desai ID, Lee M. Plasma vitamin E and cholesterol relationship in Western Canadian Indians. Am J Clin Nutr 1974; 27:334-8. [PMID: 4361700 DOI: 10.1093/ajcn/27.4.334] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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2148
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Abstract
Dental caries and periodontal disease experience varied considerably among four populations of Indian communities although environmental conditions seemed similar.
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2149
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Lee PN, Lee M, Haq AM, Longton EB, Wright V. Periarthritis of the shoulder. Trial of treatments investigated by multivariate analysis. Ann Rheum Dis 1974; 33:116-9. [PMID: 4595273 PMCID: PMC1006221 DOI: 10.1136/ard.33.2.116] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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2150
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Lee M, Haq AM, Wright V, Longton EB. Periarthritis of the shoulder: a controlled trial of physiotherapy. Physiotherapy 1973; 59:312-5. [PMID: 4603278] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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