551
|
|
552
|
Munyon W, Buchsbaum R, Paoletti E, Mann J, Kraiselburd E, Davis D. Electrophoresis of thymidine kinase activity synthesized by cells transformed by herpes simplex virus. Virology 1972; 49:683-9. [PMID: 4342081 DOI: 10.1016/0042-6822(72)90525-9] [Citation(s) in RCA: 51] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
553
|
Pugh HLD, Chandler EF, Holliday L, Mann J. The effect of hydrostatic pressure on the tensile properties of plastics. POLYM ENG SCI 1971. [DOI: 10.1002/pen.760110605] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
554
|
Munyon W, Kraiselburd E, Davis D, Mann J. Transfer of thymidine kinase to thymidine kinaseless L cells by infection with ultraviolet-irradiated herpes simplex virus. J Virol 1971; 7:813-20. [PMID: 4327589 PMCID: PMC356201 DOI: 10.1128/jvi.7.6.813-820.1971] [Citation(s) in RCA: 225] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
L cells lacking thymidine kinase (TK) activity (Ltk(-) cells) have been stably transformed to a TK-positive phenotype by infection with ultraviolet-irradiated herpes simplex virus (HSV-UV). The highest frequency of the Ltk(-) to Ltk(+) transformation observed in these experiments was approximately 10(-3), whereas no measurable transformation was observed (less than 10(-8)) in the absence of HSV-UV infection. Cell lines of HSV-transformed Ltk(+) cell lines contain 7 to 24 times as much TK activity as do the parental Ltk(-) cells, and they have been maintained in culture for a period exceeding 8 months. The kinetics of thermal inactivation of the TK activity derived from an Ltk(+) HSV-transformed cell line and the TK activity from Ltk(-) cells lytically infected with infectious HSV are similar. Both of these TK activities are much more thermolabile than the TK activity present in wild-type L cells. A mutant strain of HSV which does not induce TK activity during lytic infection does not cause the Ltk(-) to Ltk(+) transformation. These data suggest that either an HSV TK gene has been transferred to Ltk(-) cells or that an HSV gene product has caused the expression of a previously repressed cellular enzyme.
Collapse
|
555
|
|
556
|
Banthorpe DV, Mann J, Turnbull KW. Terpene biosynthesis. Part II. Biosynthesis of thujane derivatives in Thuja, Tanacetum, and Juniperus species. ACTA ACUST UNITED AC 1970. [DOI: 10.1039/j39700002689] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
557
|
Munyon W, Mann J, Grace JT. Protection of vaccinia from heat inactivation by nucleotide triphosphates. J Virol 1970; 5:32-8. [PMID: 4315159 PMCID: PMC375966 DOI: 10.1128/jvi.5.1.32-38.1970] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023] Open
Abstract
The presence of adenosine triphosphate, guanosine triphosphate, cytosine triphosphate, or uridine triphosphate reduced the rate of inactivation of vaccinia when heated at 50 C. The virus-associated nucleoside triphosphate phosphohydrolases (adenosine triphosphatase, guanosine triphosphatase, cytosine triphosphatase, and uridine triphosphatase) and ribonucleic acid polymerase were also protected from heat inactivation by these compounds. These obervations are best explained by postulating that ribonucleoside triphosphates bind to enzymes in the virus particle, and that these enzyme-substrate complexes are more resistant to thermal denaturation than are the enzymes without their substrates. The kinetics of heat inactivation of the vaccinia ATP phosphohydrolase activity is biphasic, suggesting that there are two proteins in the vaccinia particle that have this enzyme activity but they have different kinetics of heat inactivation. Any of the vaccinia-associated nucleotide phosphohydrolase activities are protected from heat inactivation by the presence of any one of the respective nucleoside triphosphates. This observation suggests that there is a single enzymatic site in vaccinia that is able to react with any ribonucleoside triphosphate.
Collapse
|
558
|
|
559
|
Mann J, Rosenthal TL. Vicarious and direct counterconditioning of test anxiety through individual and group desensitization. Behav Res Ther 1969; 7:359-67. [PMID: 5378012 DOI: 10.1016/0005-7967(69)90065-5] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
560
|
Mann J, Gurpide E. Interpretation of tracer data: some factors which reduce the number of terms in the specific activity functions in n-pool systems. THE BULLETIN OF MATHEMATICAL BIOPHYSICS 1969; 31:473-86. [PMID: 5350070 DOI: 10.1007/bf02476631] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
561
|
Mann J. The use of sodium amobarbital in psychiatry. THE OHIO STATE MEDICAL JOURNAL 1969; 65:700-2. [PMID: 5807554] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
|
562
|
Mann J, Gurpide E. Interpretation of tracer data: significance of the number of terms in specific activity functions. Biophys J 1969; 9:810-21. [PMID: 5794108 PMCID: PMC1367477 DOI: 10.1016/s0006-3495(69)86419-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023] Open
Abstract
It has already been shown that the number of pools in an open system in the steady state cannot be determined from the number of exponential terms in the specific activity function of a pool, even if the data were free from experimental error. However, some information is conveyed by the number of exponential terms. The information is different depending upon whether the data are obtained from the pool into which the tracer is introduced or from another pool. In the latter case, the number of exponential terms is shown to indicate the maximum number of intermediate pools involved in the shortest path of transfer of material from the injected pool to the pool in question. With regard to the former case, this paper is restricted to functions with two exponential terms and shows which systems of n pools (n >/= 2) are consistent with such data. Consequently, biexponential experimental curves can be interpreted in terms of models consisting of an unrestricted number of pools in which each pool is defined in terms of fast mixing. The generalization to cases of functions with more than two exponential terms can be carried out in a similar manner.
Collapse
|
563
|
Abstract
The multiplication of a new, ether-sensitive, ribonucleic acid virus, 229E, isolated from the human respiratory tract, has been studied in cultures of WI-38 human diploid cells. In thin sections of these cells examined with the electron microscope, particles appeared in vesicles in the cytoplasm of cells at a time corresponding to the initial increase in infectious virus. Antigen was also detected in the cytoplasm of cells by the immunofluorescent technique. Extracellular particles of similar morphology were prominent soon after. These events preceded a detectable cytopathic effect. Later, an electron-dense particle appeared within vacuoles in the cytoplasm but was never found extracellularly. Its role in virus development is not known. Complement-fixing antigen developed along with the increase in infectious virus.
Collapse
|
564
|
Flaschka H, Mann J. Some Observations Concerning the Quality of Murexide End Points. ANAL LETT 1967. [DOI: 10.1080/00032716708051094] [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]
|
565
|
Mann J, Gurpide E. Generalized rates of transfer in open systems of pools in the steady state. J Clin Endocrinol Metab 1966; 26:1346-54. [PMID: 5960280 DOI: 10.1210/jcem-26-12-1346] [Citation(s) in RCA: 33] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
566
|
|
567
|
Gurpide E, Mann J. Estimation of secretory rates of hormones from the specific activities of metabolites which have multiple secreted precursors. THE BULLETIN OF MATHEMATICAL BIOPHYSICS 1965; 27:389-406. [PMID: 5883206 DOI: 10.1007/bf02476844] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
|
568
|
Haward RN, Mann J. Reinforced Thermoplastics. RUBBER CHEMISTRY AND TECHNOLOGY 1965. [DOI: 10.5254/1.3547108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
If a thermoplastic is placed under load, as in a normal tensile tester, the characteristic stress strain curve is of the form given in Figure 1. Whether the material is described as tough or brittle depends on the relation between the fracture stress and the yield stress. In many cases the apparently irreversible deformation which takes place on yield is described as flow, but this is seldom, if ever, the case. The extension which takes place consists in the orientation of the tangled molecular network in a manner similar to that which occurs during extension of rubber, but with characteristic hard thermoplastics the deformation is opposed by viscous forces so that most of the energy applied is irrecoverably lost as heat. Deformations of this type are largely reversed on heating—as shown in the case of high-density polyethylene in Figure 2. In order to modify a brittle polymer to make it tougher we need to alter the relation between deformation and fracture so that, at least under short time tests, deformation takes place before fracture so that enough energy can be absorbed to cope with shock conditions. For this purpose the yield stress must be lower than the fracture stress. Naturally the ideal way of achieving this would be to raise the fracture stress, as any reduction in yield stress will normally lead to a softer and less rigid product. The extent and limitations of this problem will now be examined in relation to the styrene plastics.
Collapse
|
569
|
Gurpide E, Mann J. Evaluation of rates of secretion and of interconversion of steroid hormones. ADVANCES IN TRACER METHODOLOGY 1965; 2:253-9. [PMID: 5334300 DOI: 10.1007/978-1-4684-8622-3_29] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
|
570
|
Heritage KJ, Mann J, Roldan-Gonzalez L. Crystallinity and the structure of celluloses. ACTA ACUST UNITED AC 1963. [DOI: 10.1002/pol.1963.100010208] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
|
571
|
Mann J, Roldan-Gonzalez L. Orientation in nylon spherulites: A study by X-ray diffraction. JOURNAL OF POLYMER SCIENCE 1962. [DOI: 10.1002/pol.1962.1206016901] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
572
|
|
573
|
Fisher DG, Mann J. Crystalline modifications of cellulose. Part VI. Unit cell and molecular symmetry of cellulose I. JOURNAL OF POLYMER SCIENCE 1960. [DOI: 10.1002/pol.1960.1204213921] [Citation(s) in RCA: 25] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
574
|
Mann J, Roldan-Gonzalez L, Wellard HJ. Crystalline modifications of cellulose. Part IV. Determination of x-ray intensity data. JOURNAL OF POLYMER SCIENCE 1960. [DOI: 10.1002/pol.1960.1204213919] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
575
|
Mann J, Marrinan HJ. Crystalline modifications of cellulose. Part II. A study with plane-polarized infrared radiation. JOURNAL OF POLYMER SCIENCE 1958. [DOI: 10.1002/pol.1958.1203212507] [Citation(s) in RCA: 58] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
|
576
|
|
577
|
Kendall FH, Mann J. Reaction of Ozone with Natural Hevea and Acrylonitrile-Butadiene Rubbers. RUBBER CHEMISTRY AND TECHNOLOGY 1956. [DOI: 10.5254/1.3542636] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
The cracking of rubber vulcanizates when exposed to the atmosphere in a state of stress is a well-known phenomenon which has been studied extensively. A comprehensive review of the literature on this subject has been published by Newton. Following the lines of earlier work Newton showed conclusively that the cracking is produced by traces of ozone present in the atmosphere. The simultaneous presence of both stress and ozone is required for cracking to occur and the cracks that form are oriented with their lengths perpendicular to the direction of the stress. It has been reported, however, that similar cracking is produced when stretched rubber is exposed to free radicals produced by the thermal breakdown of organic peroxides. Unstretched vulcanizates do not crack when exposed to ozone, nor do they crack when stretched after exposure to ozone. Apart from the frosting effect described by Tuley, which is stated to require the presence of moisture and which may require the presence of small stresses, there seems to be no record in the literature of a visible effect being produced by the action of ozone on unstretched vulcanizates. The effect of ozone on unstretched vulcanizates has been investigated more completely and the results are reported in the present paper. Little is known of the mechanism of the reactions that lead to cracking of vulcanizates and this paper describes experiments designed to throw some light on this. The products of the reaction between ozone and solid rubber have been investigated by means of infrared spectroscopy. Allison and Stanley have previously described the infrared spectra of products formed from solutions of Hevea and various synthetic rubbers and Salomon and van der Schee have recently reported changes which occur in the infrared spectrum of a film of Hevea rubber when exposed to ozonized air.
Collapse
|
578
|
Marrinan HJ, Mann J. Infrared spectra of the crystalline modifications of cellulose. JOURNAL OF POLYMER SCIENCE 1956. [DOI: 10.1002/pol.1956.120219812] [Citation(s) in RCA: 131] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
579
|
Kendall FH, Mann J. Reaction of ozone with natural hevea and acrylonitrile-butadiene rubbers. JOURNAL OF POLYMER SCIENCE 1956. [DOI: 10.1002/pol.1956.120199312] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
|
580
|
Mann J, Marrinan HJ. The reaction between cellulose and heavy water. Part 2.—Measurement of absolute accessibility and crystallinity. ACTA ACUST UNITED AC 1956. [DOI: 10.1039/tf9565200487] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
581
|
Mann J, Marrinan HJ. The reaction between cellulose and heavy water. Part 1. A qualitative study by infra-red spectroscopy. ACTA ACUST UNITED AC 1956. [DOI: 10.1039/tf9565200481] [Citation(s) in RCA: 90] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
582
|
Mann J, Marrinan HJ. The reaction between cellulose and heavy water. Part 3.—A quantitative study by infra-red spectroscopy. ACTA ACUST UNITED AC 1956. [DOI: 10.1039/tf9565200492] [Citation(s) in RCA: 54] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
583
|
Mann J. Analysis of Vulcanized Rubbers. Influence of Accelerators on the Determination of Free Sulfur by the Copper Spiral Method. RUBBER CHEMISTRY AND TECHNOLOGY 1952. [DOI: 10.5254/1.3543454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
The copper spiral method is being inserted in a revised edition of the “British Standard Methods of Testing Vulcanized Rubber”, and this raises the question of what sulfur compounds react as “free” sulfur. In this method, “free” sulfur is considered to be that part of the sulfur which is present in the acetone extract and which reacts with a copper spiral, placed in the acetone during the extraction, with the production of copper sulfide, the amount of which can be estimated after its removal from the acetone. Since most accelerators contain sulfur, it is obvious that the presence of accelerators or accelerator fragments is a potential source of error. Fourteen accelerators of various types were therefore examined, and it was found that some react with copper, producing compounds which evolve hydrogen sulfide on treatment with hydrochloric acid.
Collapse
|
584
|
Mann J. Identification of Accelerators and Antioxidants in Vulcanizates by Infrared Spectroscopy. RUBBER CHEMISTRY AND TECHNOLOGY 1952. [DOI: 10.5254/1.3543400] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Abstract
Reliable methods for the chemical analysis of vulcanizates have been available for many years, and standard methods have been published in a British Standard which has recently been revised, but these methods do not cover the identification of accelerators and antioxidants and no comprehensive scheme for this type of analysis has been published. The identification of accelerators and antioxidants in vulcanizates presents a difficult problem because of the small concentrations employed, the close chemical similarity of many of them, and the wide variety of substances used. Many chemical tests have been developed for their identification, but difficulties arise when they are applied to vulcanizates. On the whole these chemical tests are unsatisfactory, and it seems unlikely that a comprehensive chemical scheme can be devised for the identification of accelerators and antioxidants in vulcanizates. There are, however, several physico-chemical methods which can be used for such analyses. The work of Proske has shown that accelerators in vulcanizates can be detected and estimated by the polarograph. The method is applicable to thiazoles, thiuram disulfides, and dithiocarbamates, but cannot be used with such accelerators as guanidines. Chromatography has recently been applied to the problem with considerable success. It has been shown that several accelerators give a characteristic chromatogram when the acetone extract of their vulcanizate is chromatographed on alumina, either alone or in the presence of cobalt oleate. In addition, antioxidants can be separated by chromatography from the rest of the acetone extract and can then be identified by color reactions. Although this method has been found in the R.A.B.R.M. laboratories to be very useful, there are serious difficulties in the way of developing a comprehensive scheme of analysis on this basis. For example, distinction between the various dithiocarbamate accelerators is difficult, and the method sometimes gives ambiguous results when applied to complex mixtures. Ultraviolet spectroscopy has been applied to the detection of accelerators and their decomposition products in vulcanizates, to the estimation of accelerators in masterbatches, and to the quantitative estimation of antioxidants. These applications suggest that ultraviolet spectroscopy should be a useful method for the identification of accelerators and antioxidants in vulcanizates.
Collapse
|
585
|
Mann J. CASE REPORTS ILLUSTRATING SOME OBSERVATIONS IN THE TREATMENT OF HYPEREMESIS GRAVIDARUM. CANADIAN MEDICAL ASSOCIATION JOURNAL 1933; 28:48-51. [PMID: 20318977 PMCID: PMC402676] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
|
586
|
Gibson T, Mann J. Mimicry of the Acute Abdomen in Cases of Cyclic Vomiting in Children, with Report of a Case. CANADIAN MEDICAL ASSOCIATION JOURNAL 1928; 19:44-45. [PMID: 20316921 PMCID: PMC1709745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
|