6751
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Rivas ML, Conneally PM, Lovrien EW, Magenis RE, Merritt AD, Meyers DA, Palmer CG, Parks M, Wang L, Yu PL. The linkage and mapping relationships of 1 qh. CYTOGENETICS AND CELL GENETICS 1976; 16:347-50. [PMID: 975906 DOI: 10.1159/000130629] [Citation(s) in RCA: 1] [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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6752
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Wang L, Simões CL, Sonohara S, Brentani M, Andrade HF, da Silva SM, Salles JM, Marques N, Brentani R. Isolation and characterization of collagen messenger RNA*. Nucleic Acids Res 1975; 2:655-66. [PMID: 1144059 PMCID: PMC343618 DOI: 10.1093/nar/2.5.655] [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: 12/25/2022] Open
Abstract
Chick embryo collagen-synthesizing polysomes were isolated by differential centrifugation. RNA extracted from these particles was chromatographed in oligo(dT)-cellulose solumns and the mRNA thus obtained characterized as collagen mRNA by its electrophoetical mobility in acrylamide gels (equivalent to 1.05 x 10-6 daltons) and its effect upon a cell-free system derived from Krebs ascites tumor cells. The incorporation of 3H-proline was markedly dependent upon rabbit reticulocyte initiation factors and inhibited by initiation inhibitors such as aurintricaboxilate and pyrocatechol violet. The incorporation product was characterized as collagen by its lack of tryptophan, digestibility by purified bacterial collagenase, and by its co-chromatography with unlabled chick collagen in Sephadex G-200 and CM-cellulose columns.
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6753
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Meyers DA, Conneally PM, Hecht F, Lovrien EW, Magenis E, Merritt AD, Palmer GC, Rivas ML, Wang L. Linkage group I: multipoint mapping. CYTOGENETICS AND CELL GENETICS 1975; 14:381-9. [PMID: 1192823 DOI: 10.1159/000130390] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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6754
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Rivas ML, Conneally PM, Hecht F, Lovrien EW, Magenis E, Merritt AD, Meyers DA, Palmer CG, Wang L. Linkage relationships of 1qh to Amy, Fy, PGM1, and Rh. CYTOGENETICS AND CELL GENETICS 1975; 14:409-17. [PMID: 1192828 DOI: 10.1159/000130395] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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6755
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Wang L, Andrade HF, Silva SM, Simões CL, D'Abronzo FH, Brentani R. Isolation and characterization of collagen-synthesizing polysomes from chick embryos. PREPARATIVE BIOCHEMISTRY 1975; 5:45-57. [PMID: 168569 DOI: 10.1080/00327487508061561] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Collagen-synthesizing polysomes were isolated by low-speed centrifugation of the post-mitochondrial supernatant of chick homogenates. Electron microscopy of the fraction thus isolated shows it to be exclusively composed of ribosomes. Amino acid incorporation in vitro showed that these particles were efficient in the incorporation of proline, but not tryptophan, as opposed to ribosomes obtained from the supernatant of the low-speed centrifugation. The incorporation process was highly dependent on GTP, and exibited an optimal Mg2+concentration of 5.6mM. The reaction was inhibited by RNase, elongation inhibitors as anysomycin, sparsomycin, fusidic acid and GDPCP. It was also moderately inhibited by initiation inhibitors such as aurintricarboxilic acid and pyrocatechol violet. The product of the incorporation was characterized as collagen by its sensitivity towards purified collagenase, lack of tryptophan, chromatography in CM-cellulose and molecular sieve chromatography in Sephadex G-200.
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6756
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Cavalli-Sforza LL, Santachiara SA, Wang L, Erdelyi E, Barchas J. Electrophoretic study of 5-hydroxytryptophan decarboxylase from brain and liver in several species. J Neurochem 1974; 23:629-34. [PMID: 4547785 DOI: 10.1111/j.1471-4159.1974.tb04385.x] [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: 01/11/2023]
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6757
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Yarkoni E, Wang L, Bekierkunst A. Suppression of growth of Ehrlich ascites tumor cells in mice by trehalose-6,6'-dimycolate (cord factor) and BCG. Infect Immun 1974; 9:977-84. [PMID: 4208531 PMCID: PMC414920 DOI: 10.1128/iai.9.6.977-984.1974] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
Growth of Ehrlich ascites tumor cells in mice pretreated with cord factor was compared to growth of the tumor cells after pretreatment with Calmette-Guérin bacilli. Growth of Ehrlich ascites cells was strongly inhibited in the peritoneal cavities of mice pretreated with 80 mug of cord factor. The median survival time of the animals was prolonged (70 versus 17 days), and 40% of the mice survived more than 90 days. Tumor suppression was still detectable 36 days after administration of cord factor. The effect of cord factor was local. Comparable results were obtained with living or killed Calmette-Guérin bacilli. The results are discussed.
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6758
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Wang L, Brentani R. [Mechanism of protein synthesis]. REVISTA DO HOSPITAL DAS CLINICAS 1974; 29:159-62. [PMID: 4453776] [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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6759
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Paris JE, Wang L. Letter: Effect of immunological inhibition of lysosome function on radiation survival of rat sarcoma cells in culture. INTERNATIONAL JOURNAL OF RADIATION BIOLOGY AND RELATED STUDIES IN PHYSICS, CHEMISTRY, AND MEDICINE 1974; 25:95-8. [PMID: 4543820 DOI: 10.1080/09553007414550101] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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6760
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Marques N, Wang L, Myiashita M, Stolf AM, Balsamo J, Brentani R. Reiteration of DNA complementary to a cytoplasmic non-ribosomal RNA. Biochem Biophys Res Commun 1973; 53:317-25. [PMID: 4741550 DOI: 10.1016/0006-291x(73)91436-8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6761
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Takayama K, Wang L, Merkal RS. Scanning electron microscopy of the H37Ra strain of Mycobacterium tuberculosis exposed to isoniazid. Antimicrob Agents Chemother 1973; 4:62-5. [PMID: 4208900 PMCID: PMC444505 DOI: 10.1128/aac.4.1.62] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
The morphology of cells of the H37Ra strain of Mycobacterium tuberculosis exposed to 0.5 mug of isonicotinic acid hydrazide (isoniazid) per ml was examined by scanning electron microscopy (SEM). Cells that were exposed to isoniazid for 3 h showed no detectable change, whereas cells exposed to the drug for 24 h exhibited diverse morphological features. From our examination of these SEM pictures, we have reconstructed the probable sequence of morphological changes to be as follows: (i) the wrinkling of the cell surface was ascribed as the earliest observable change, (ii) the cell surface then became very rough and ragged, (iii) eventually the cytoplasmic material was extruded from the cell, (iv) this event produced a collapsed cell, (v) the cells began to fragment, (vi) the fragmented cells then coalesced to form an amorphous mass of cell debris.
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6762
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Brentani R, Peres CS, Oda CH, Wang L. Messenger RNA processing in vertebrate cells. BASIC LIFE SCIENCES 1973; 1:169-78. [PMID: 4359215 DOI: 10.1007/978-1-4684-0877-5_13] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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6763
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Wang L, Takayama K. Relationship between the uptake of isoniazid and its action on in vivo mycolic acid synthesis in Mycobacterium tuberculosis. Antimicrob Agents Chemother 1972; 2:438-41. [PMID: 4207759 PMCID: PMC444336 DOI: 10.1128/aac.2.6.438] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A direct relationship was established between the rate of uptake of isoniazid and the action of this drug on in vivo mycolic acid synthesis in Mycobacterium tuberculosis H37Ra. The rate of uptake of isoniazid increased linearly with its external concentration and appeared to reach a maximal value of 52 pmoles per hr per 10(9) cells at an external concentration of about 13 mum. Correspondingly, the rate of inhibition of mycolic acid synthesis increased with the rise in the rate of uptake of the drug. A 50% inhibition of mycolic acid synthesis occurred when the uptake of isoniazid reached 5.2 pmoles per 10(9) cells. Calculations showed that this level of drug uptake represents an internal cellular concentration of 9 mum. These results show clearly that the action of isoniazid on the mycolate synthetase system of M. tuberculosis is rapid and that this enzyme system is highly sensitive to the drug.
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6764
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Takayama K, Wang L, David HL. Effect of isoniazid on the in vivo mycolic acid synthesis, cell growth, and viability of Mycobacterium tuberculosis. Antimicrob Agents Chemother 1972; 2:29-35. [PMID: 4208567 PMCID: PMC444261 DOI: 10.1128/aac.2.1.29] [Citation(s) in RCA: 219] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
When an actively growing culture of the H37Ra strain of Mycobacterium tuberculosis was exposed to isoniazid at a concentration of 0.5 mug/ml, the cells began to lose their ability to synthesize mycolic acids immediately. After 60 min, the cells had completely lost this ability. The synthesis of the three mycolate components-alpha-mycolate, methoxymycolate, and beta-mycolate-was inhibited. The viability of the isoniazid-treated cells was unaffected up to about 60 min of exposure, after which time there was a gradual decline in the viability to about 18% after 180 min. Correspondingly, growth of the drug-treated cells slowed down and stopped after 24 hr. The inhibition of the synthesis of mycolic acids was reversible if the drug was removed before the loss of viability set in. Incubation of the viable cells in the absence of the drug for 24 hr restored the mycolate synthesis. These results strongly suggest that the inhibition of the synthesis of the mycolic acids is closely associated with the primary mechanism of action of isoniazid on the tubercle bacilli. The sequence of events which leads to the loss of viability of cells exposed to isoniazid is described.
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6765
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Hansen BS, Vaughan MH, Wang L. Reversible inhibition by histidinol of protein synthesis in human cells at the activation of histidine. J Biol Chem 1972; 247:3854-7. [PMID: 4338230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
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6766
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Wang L, Takayama K, Goldman DS, Schnoes HK. Synthesis of alcohol and wax ester by a cell-free system in Mycobacterium tuberculosis. BIOCHIMICA ET BIOPHYSICA ACTA 1972; 260:41-8. [PMID: 4401085 DOI: 10.1016/0005-2760(72)90072-0] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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6767
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Aitken GJ, Wang L. New multichannel optical correlator. APPLIED OPTICS 1971; 10:2476-2481. [PMID: 20111359 DOI: 10.1364/ao.10.002476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
This paper describes a multichannel optical correlator that uses two spatial dimensions to achieve multi-channel capability and operates in real time. Given I signals, r(i)(t), and J signals, s(j)(t), it can produce the I x J cross products, r(i)(t)s(j)(t), averaged over some interval. Multiplication is based on the fact that the square of the sum of two signals contains their cross product. Light fields modulated by the signals are added and their sum squared by measuring its intensity. An experimental correlator and its performance are described along with applications.
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6768
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Takayama K, David HL, Wang L, Goldman DS. Isolation and characterization of uridine diphosphate-N-glycolylmuramyl-L-alanyl-gamma-D-glutamyl-meso-alpha,alpha'-diaminopimelic acid from Mycobacterium tuberculosis. Biochem Biophys Res Commun 1970; 39:7-12. [PMID: 4985610 DOI: 10.1016/0006-291x(70)90749-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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6769
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Abstract
Cell-free extracts of the H37Ra strain of Mycobacterium tuberculosis contain a soluble enzyme system which catalyzes an elongation reaction of long-chain fatty acids. The predominant reaction involves the addition of a single C(2) unit to the acceptor fatty acid; the elongation takes place exclusively at the carboxyl end of the acceptor molecule. The endogenous acceptor lipid can be removed by solvent extraction of the enzyme system. The lipid-depleted enzyme can be fully reactivated with external acyl coenzyme A, after which elongation with acetyl coenzyme A takes place. The elongation reaction is avidin-insensitive and does not require adenosine triphosphate. Reduced nicotinamide adenine dinucleotide is the source of reducing equivalent, whereas reduced nicotinamide adenine dinucleotide phosphate is without effect.
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6770
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Wang L, Wilkins JH, Airth RL. Repression of thiaminase I by thiamine and related compounds in Bacillus thiaminolyticus. Can J Microbiol 1968; 14:1143-7. [PMID: 5681526 DOI: 10.1139/m68-191] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
The extracellular enzyme thiaminase I from Bacillus thiaminolyticus is repressible by thiamine. Either one of the heterocyclic moieties of this vitamin supported limited growth of this organism but had no effect on thiaminase I production. However, a combination of these two resulted in optimal growth and partial repression of this enzyme. The products of the base exchange reaction catalyzed by thiaminase I are not functional in repression when present alone. The simultaneous presence of both reaction products, i.e., N-[5-(4-amino-2-methylpyrimidinyl)] methyl aniline and 5-(2′-hydroxy-ethyl)-4-methylthiazole, can replace the vitamin B1 requirement for growth and give the same degree of enzyme repression. Neither pyrithiamine nor oxythiamine inhibited growth of the organism when present in a 100:1 molar ratio to thiamine. Pyrithiamine and vitamin B1 repressed thiaminase I to approximately the same extent, whereas oxythiamine was only partially functional in this process.
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6771
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6772
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Cohn ML, Wang L, Scouten W, McManus IR. Intramitochondrial distribution of multiple forms of pig heart lipoamide dehydrogenase. BIOCHIMICA ET BIOPHYSICA ACTA 1968; 159:182-5. [PMID: 4870337 DOI: 10.1016/0005-2744(68)90258-1] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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6773
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Tomatis L, Wang L. Neoplastic conversion in vitro of newborn mouse thymic cells. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1967; 126:289-93. [PMID: 6066180 DOI: 10.3181/00379727-126-32427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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6774
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6775
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Swineford O, Wang L. Specific passive desensitization. VI. By specific homologous and heterologous antisera. VII. In actively sensitized guinea pigs. J Allergy (Cairo) 1967; 39:37-43. [PMID: 5225389 DOI: 10.1016/0021-8707(67)90125-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
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6776
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Schoyen R, Harboe A, Wang L. Influenza virus HI-antibody combing with normal chick material and produced in hens immunized with chick grown influenza virus. ACTA PATHOLOGICA ET MICROBIOLOGICA SCANDINAVICA 1966; 68:103-7. [PMID: 5954967 DOI: 10.1111/apm.1966.68.1.103] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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6777
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Tomatis L, Wang L. The presence of lymphocytes in long term cultures of newborn mouse thymic epithelium. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1965; 120:472-80. [PMID: 5323097 DOI: 10.3181/00379727-120-30566] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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6778
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Huang L, Wang L. [Studies on antiviral compounds. II. The synthesis of acetophenone derivatives]. YAO XUE XUE BAO = ACTA PHARMACEUTICA SINICA 1965; 12:667-71. [PMID: 5899053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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