601
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Losken HW, Morris WM, Earle JW, le Roux PA, Uys PB, Wright A, Walker D. The Pietermaritzburg craniofacial unit. S Afr Med J 1982; 62:203-6. [PMID: 7101071] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
The Pietermaritzburg Craniofacial Unit was established in 1976, and since its inception 150 patients with major skull and facial deformities have been referred there from centres throughout South Africa. Fifty craniofacial operations have been performed by the surgeons of the Unit, who form only a part of a team of 16 members from many branches of the medical, dental and allied professions. Craniofacial surgery is defined and reasons are presented for limiting the number of such highly specialized units.
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602
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Abstract
Fusion of cilia, the growth of clumps of fused cilia and giant cilium formation have been studied in the normal human organ of Corti using the scanning electron microscope. These unusual forms are found mainly in the apical portions of the cochlea and appear to precede the loss of normal apical cilia which increases and extends in a basal direction with age. These changes may be due to low frequency noise damage or be a phenomenom of ageing. The mechanism of their formation is discussed in the light of recent experimental work on cell fusion.
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603
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Holmes WN, Gorsline J, Wright A. Patterns of cloacal water and electrolyte excretion in constantly-loaded intact and colostomized ducks (Anas platyrhynchos). COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY. A, COMPARATIVE PHYSIOLOGY 1982; 73:675-7. [PMID: 6130869 DOI: 10.1016/0300-9629(82)90274-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
1. The patterns of cloacal water and electrolyte excretion were qualitatively similar in intact and chronically colostomized ducks given oral loads of either distilled water or electrolyte solution. 2. The rates of Na+ and K+ excretion were each selectively increased in birds loaded with solutions containing a relatively higher concentration of each ion. 3. Compared to the intact birds, the colostomized birds showed lower rates of electrolyte excretion following administration of identical electrolyte loads and thus appeared to be retaining electrolyte. 4. At the same time, a significant antidiuresis of similar magnitude occurred in each group of saline-loaded birds. 5. The possible contributions of renal and post-renal mechanisms to the overall conservation of water in intact and colostomized ducks are discussed.
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604
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Elarby A, Jal J, Dupuy J, Chieux P, Wright A, Parreins R. Nucléation homogène et cristallisation de la glace cubique (Ic) dans les verres d'électrolytes LiCl.D2O. ACTA ACUST UNITED AC 1982. [DOI: 10.1051/jphyslet:019820043010035500] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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605
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Reynolds AE, Felton J, Wright A. Insertion of DNA activates the cryptic bgl operon in E. coli K12. Nature 1981; 293:625-9. [PMID: 6270569 DOI: 10.1038/293625a0] [Citation(s) in RCA: 208] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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606
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Abstract
Preservation of the fine structures of the human cochlea has been achieved by perfusing the cochlea with fixative shortly after death. Following the dissection of the temporal bone the surface of the organ of Corti and stria vascularis has been examined in the scanning electron microscope. The surfaces of the inner and outer hair cells can be seen and the stereocilia projecting from their surfaces closely examined. The number and length of the stereocilia of the outer hair cells changes linearly with distance along the cochlear duct. The surface of the stria vascularis is similar to that seen in other animals.
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607
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Inouye H, Michaelis S, Wright A, Beckwith J. Cloning and restriction mapping of the alkaline phosphatase structural gene (phoA) of Escherichia coli and generation of deletion mutants in vitro. J Bacteriol 1981; 146:668-75. [PMID: 6260756 PMCID: PMC217011 DOI: 10.1128/jb.146.2.668-675.1981] [Citation(s) in RCA: 105] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
The structural gene for alkaline phosphatase (phoA) of Escherichia coli was cloned into the PstI site of pBR322, from a transducing bacteriophage, lambda p(phoA-proC). The restriction map of the plasmid was established. Based upon this information, several phoA deletion plasmids as well as a smaller phoA+ plasmid were constructed. The genetic map and restriction map were correlated by recombination analysis. Cells carrying one of the phoA+ plasmids overproduce alkaline phosphatase 10-fold upon phosphate limitation. However, both regulation and processing of the enzyme were found to be normal.
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608
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Abstract
Tracheostomy in children has been reported to cause tracheal stenosis, laryngeal stenosis and subsequent difficulties in decannulation. No long term follow-up studies appear to be in the literature describing the events following decannulation. This study compared the radiological size of the cricoid and tracheal lumens with that of normals. Except in special cases tracheostomy did not affect the subsequent growth of the trachea or cricoid. It is suggested that traumatic tracheal narrowing in children should be managed conservatively.
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609
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Schaus N, O'Day K, Peters W, Wright A. Isolation and characterization of amber mutations in gene dnaA of escherichia coli K-12. J Bacteriol 1981; 145:904-13. [PMID: 7007354 PMCID: PMC217197 DOI: 10.1128/jb.145.2.904-913.1981] [Citation(s) in RCA: 29] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Amber mutants with defects in the dnaA gene of Escherichia coli K-12 were isolated after localized mutagenesis of the tna-dnaA region of the chromosome. We isolated 36 mutants defective in the initiation of deoxyribonucleic acid replication as determined by their dependence upon integrative suppression by a P2 sig5 prophage. Three of the 36 mutants were shown to contain amber mutations through the use of a temperature-sensitive amber suppressor. These mutations, which mapped between gyrB and tna, were characterized genetically and biochemically as amber mutations in dnaA.
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610
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Wright A. Scanning electron microscopy of the human cochlea--the organ of Corti. ARCHIVES OF OTO-RHINO-LARYNGOLOGY 1981; 230:11-9. [PMID: 7213191 DOI: 10.1007/bf00665375] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
The surface of the organ of Corti from normally hearing adult humans has been examined with the scanning electron microscope. It is possible to construct cytocochleograms and to derive a regression line with confidence limits to represent the distribution of the sensory hair cells. Examining individual hair cells more closely, the number of cilia on each hair cell, decreased linearly with distance, from the base of the cochlea. However, the length of the longest cilia on each outer hair cell increased linearly with distance.
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611
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Wright A. Some Yorkshire proprietaries. PHARMACEUTICAL HISTORIAN 1980; 10:6-8. [PMID: 11630745] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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612
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Wright A. Scanning electron microscopy of the human cochlea - the stria vascularis. ARCHIVES OF OTO-RHINO-LARYNGOLOGY 1980; 229:39-44. [PMID: 7469936 DOI: 10.1007/bf00453750] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The endolymphatic surface of the stria vascularis from normally hearing human ears has been studied with the scanning electron microscope. The cells in contact with the endolymph usually have a hexagonal-shaped surface and possess many microvilli, whilst depressions or pits are rarely seen. There is marked heterogeneity of these cells with variations in the size of the cells and the number of microvilli present on each cell. A transitional zone occurs between the stria vascularis and the spiral prominence. The surface of the cells of the transitional zone are larger and elongated whilst the cells of the spiral prominence have a smaller and more regular appearance.
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613
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Wright A. Scanning electron microscopy of the human cochlea--postmortem autolysis artefacts. ARCHIVES OF OTO-RHINO-LARYNGOLOGY 1980; 228:1-6. [PMID: 6781458 DOI: 10.1007/bf00455888] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Changes in the ultrastructure of the cochlea due to postmortem autolysis make the assessment of the normal or damaged anatomy difficult. Three methods of preserving the human cochlea were compared on the basis of the state of preservation of the sensory cell hairs of the organ of Corti as seen in the scanning electron microscope. Perfusion of the perilymphatic space with a glutaraldehyde-formaldehyde fixative within 40 min of death gave preservation as good as that seen in animal studies. Injecting formalin into the middle ear within 40 min of death allowed artefacts to develop when compared with the control ear which had been perfused with fixative. Refrigeration and early removal of the temporal bone gave poor preservation of surface structures.
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614
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Abstract
In a series of children due to have surgery on their upper respiratory tracts an assessment of mouth breathing, abnormality on anterior rhinoscopy and size of the adenoid on posterior rhinoscopy was made by 3 observers. All these signs showed poor reproducibility between observers and the size of the adenoid assessed by posterior rhinoscopy showed no significant relationship to the weight of the adenoid subsequently removed.
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615
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616
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Felton J, Michaelis S, Wright A. Mutations in two unlinked genes are required to produce asparagine auxotrophy in Escherichia coli. J Bacteriol 1980; 142:221-8. [PMID: 6102983 PMCID: PMC293934 DOI: 10.1128/jb.142.1.221-228.1980] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
Escherichia coli K-12 has two genes, asnA+ and asnB+, either one of which is able to satisfy the need of cells for asparagine. In order for a strain to have an auxotrophic requirement for asparagine, both genes must be mutationally inactivated. We obtained mutants with Tn5 inserted in asnB. asnB was mapped by conjugation and by three-factor P1 transductions at 15 min on the E coli K-12 linkage map, between ubiF and nagB. Specialized transducing phage lamba 781 supE was shown to carry asnB, as well as supE, ubiF, nagA, and nagB. asnA is the previously mapped ilv-linked asn locus, whiich is between uncB and rbs. E. coli C also has two asn genes, corresponding to asnA and asnB.
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617
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Wright A, Burstyn PG, Gibney MJ. Dietary fibre and blood pressure. Proc Nutr Soc 1980; 39:3A. [PMID: 6245415 DOI: 10.1079/pns19800015] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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618
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Abstract
Ninety-four volunteers participated in a three-day weighed dietary survey and had their blood pressures measured once. They were classified according to their fibre intake. Subjects with a high-fibre intake were found to have lower mean blood pressures than those with a low-fibre intake. Forty-two of the volunteers further participated in a group of experiments. Those eating a high-fibre diet decreased their dietary fibre, and those eating a low-fibre diet increased their dietary fibre. The first group (11 subjects) showed increased mean blood pressures after four weeks of eating the experimental diet. The last group (31 subjects) showed decreased mean blood pressures after four weeks of eating the experimental diet. The 11 subjects consuming the low-fibre experimental diet showed a decrease in mean blood pressure when some of the saturated fat in their diet was replaced by polyunsaturated fat. A similar substitution carried out by 14 of the subjects consuming the high-fibre experimental diet also resulted in decreased mean blood pressure, but this was not statistically significant. Twelve more volunteers, with hypertension, were all found to have low-fibre diets. They consumed a high-fibre diet for a six-week experimental period, but their mean blood pressures did not decrease significantly; individual recordings varied substantially during this period.It is suggested that differences in the type and quantity of dietary fibre and fat may be responsible for the lower mean blood pressures of groups of vegetarians compared with similar groups of non-vegetarians.
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619
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Felton J, Wright A. Plasmid pSC101 replication in integratively suppressed cells requires dnaA function. MOLECULAR & GENERAL GENETICS : MGG 1979; 175:231-3. [PMID: 390317 DOI: 10.1007/bf00425541] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Maintenance of plasmid pKC17, a derivative of plasmid pSC101, in E. coli requires a functional dnaA gene product. This was demonstrated by segregation experiments using an E. coli dnaA46 mutant, at various temperatures. Growth of this mutant at elevated temperature was allowed by the presence of a P2sig5 prophage. rpoB mutations, which suppress the temperature sensitivity of a dnaA46 mutant permit efficient maintenance of plasmid pKC17 at temperatures up to 40 degrees, conditions which normally inactivate the dnaA46 product.
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620
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Boyd DH, Porter LM, Young BS, Wright A. The in vitro detection of defects in temperature sensitive RNA polymerases from mutants of Salmonella typhimurium. MOLECULAR & GENERAL GENETICS : MGG 1979; 173:279-87. [PMID: 384150 DOI: 10.1007/bf00268638] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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621
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McConnell M, Reznick A, Wright A. Studies on the initial interactions of bacteriophage epsilon15 with its host cell, Salmonella anatum. Virology 1979; 94:10-23. [PMID: 35879 DOI: 10.1016/0042-6822(79)90434-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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622
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McConnell M, Wright A. Variation in the structure and bacteriophage-inactivating capacity of Salmonella anatum lipopolysaccharide as a function of growth temperature. J Bacteriol 1979; 137:746-51. [PMID: 422511 PMCID: PMC218352 DOI: 10.1128/jb.137.2.746-751.1979] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Growth temperature affects both the structure and the phage-inactivating capacity of Salmonella anatum A1 lipopolysaccharide. Whereas S. anatum cells normally synthesize smooth lipopolysaccharide when grown at physiological temperature (37 degrees C), a partial smooth-rough transition occurs when cells are grown at low temperature (20 to 25 degrees C). The synthesis at low growth temperature of lipopolysaccharide molecules lacking O-antigen was detected both by increased sensitivity of cells to the rough-specific bacteriophage Felix O-1 and by fractionation of oligosaccharides derived from lipopolysaccharide by mild acid hydrolysis. Growth temperature-induced changes in the structure of S. anatum A1 lipopolysaccharide also affected its ability to inactivate epsilon15, a bacteriophage that binds initially to the O-antigen portion of the molecule. Purified lipopolysaccharide prepared from cells grown at low growth temperature exhibited a higher in vitro phage-inactivating capacity than did lipopolysaccharide prepared from cells grown at physiological temperature (37 degrees C).
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623
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Wright A. Squares, cubes, and power. West J Med 1979. [DOI: 10.1136/bmj.1.6157.198-b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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624
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Huclická O, Wright A. The effect of vibration on blood flow in skeletal muscle in the rabbit. CLINICAL SCIENCE AND MOLECULAR MEDICINE 1978; 55:471-6. [PMID: 720000 DOI: 10.1042/cs0550471] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
1. The blood flow in rabbit gastrocnemius, as measured by photoelectric drop-counter, increased when the muscle was vibrated at frequencies of 22--62 Hz. 2. Blood flow increased rapidly within 1--2 s of the start of vibration, and lasted for the whole time vibration was applied. 3. The increase in blood flow was negatively correlated with the initial blood flow, being greater with lower flows. 4. The magnitude of increase was similar in both innervated and acutely denervated muscles. 5. The arterial blood pressure did not change apart from a very brief fall at the beginning of vibration. Venous pressure rose and, consequently, the perfusion pressure was lower. The increase in blood flow thus indicates a considerable dilatation in the resistance vessels of skeletal muscle.
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625
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Mackay AV, Yates CM, Wright A, Hamilton P, Davies P. Regional distribution of monoamines and their metabolites in the human brain. J Neurochem 1978; 30:841-8. [PMID: 650225 DOI: 10.1111/j.1471-4159.1978.tb10792.x] [Citation(s) in RCA: 83] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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626
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Young BS, Wright A. Multiple effects of an RNA polymerase beta' mutation on in vitro transcription. MOLECULAR & GENERAL GENETICS : MGG 1977; 155:191-6. [PMID: 337127 DOI: 10.1007/bf00393159] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
S. tyrphimurium strain BY324 is temperature sensitive due to a mutation (rpo C32) in the gene for the RNA polymerase beta' subunit. Transcription of T7 DNA by RNA polymerase purified from this strain is temperature sensitive in vitro. The enzyme is slightly defective in template binding and RNA chain initiation, but the major defect is in RNA chain elongation. The rate of RNA chain elongation is reduced 4-5 fold relative to wild-type. RNA chain termination does not appear to be affected by the beta' mutation. While the elongation defect is suppressed by glycerol or dimethylsulfoxide, the initiation defect is not. Possible roles for the beta' subunit in enzyme function are discussed in light of these results.
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627
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Leavitt DD, Stryker JA, Campbell DW, Strockbine MF, Wright A. Comparison of moving-strip therapy using a Cobalt-60 teletherapy unit, a Varian 4-MV linear accelerator, and a Varian 10-MV linear accelerator. Med Phys 1977; 4:220-5. [PMID: 407435 DOI: 10.1118/1.594369] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Cobalt-60 gamma rays and 4- and 10-MV x rays are compared for moving-strip therapy in terms of the dose uniformity and the given dose needed to deliver a prescribed tumor dose. Dose distributions in phantoms of 14--32-cm thickness were calculated for each therapy unit. Individual given doses which would deliver the most uniform dose along the midline of the treatment volume were determined by computer and were verified experimentally by thermoluminescent dosimetry. Using computer optimization techniques, the midplane dose uniformity is improved significantly for the three therapy units considered.
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628
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Young BS, Guterman SK, Wright A. Temperature-sensitive ribonucleic acid polymerase mutant of Salmonella typhimurium with a defect in the beta' subunit. J Bacteriol 1976; 127:1292-7. [PMID: 783138 PMCID: PMC232923 DOI: 10.1128/jb.127.3.1292-1297.1976] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Localized mutagenes of Salmonella typhimurium followed by a [3H]uridine enrichment procedure yielded a temperature-sensitive strain with a mutation in the rpo region of the chromosome. Ribonucleic acid (RNA) polymerase (EC 2.7.7.6; nucleoside triphosphate: RNA nucleotidyltransferase) purified from this mutant was considerably less active at the nonpermissive temperature than wild-type enzyme. Furthermore, the enzyme from this mutant, unlike RNA polymerase of previously isolated temperature-sensitive mutants, was as thermostable as wild-type enzyme when preincubated at 50 degrees C. Subunit reconstitution experiments have shown that the temperature sensitivity is caused by an alteration in the beta' subunit of the enzyme.
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629
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Guterman SK, Wright A, Boyd DH. Genes affecting coliphage BF23 and E colicin sensitivity in Salmonella typhimurium. J Bacteriol 1975; 124:1351-8. [PMID: 1104583 PMCID: PMC236047 DOI: 10.1128/jb.124.3.1351-1358.1975] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
Rough strains of Salmonella typhimurium were sensitive to coliphage BF23. Spontaneous mutants resistant to BF23 (bfe) were isolated, and the trait was mapped using phage P1. The bfe gene in S. typhimurium was located between argF (66% co-transducible) and rif (61% co-transducible). The BF23-sensitive S. typhimurium strains were not sensitive to the E colicins. Cells of these rough strains absorbed colicin, as measured by loss of E2 or E3 killing units from colicin solutions and by specific adsorption of 125I-colicin E2 to bfe+ cells. Sensitivity to colicins E1, E2, and E3 was observed in a S. typhimurium strain carrying the F'8 gal+ episome. This episome complemented the tolB mutation of Escherichia coli. We conclude that the bfe+ protein satisfies requirements for adsorption of both phage BF23 and the E colicins. In addition, expression of a gene from E. coli, possibly tolB, is necessary for efficient E colicin killing of S. typhimurium.
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630
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Keane FBV, Harrison MR, Papaioannou T, Moore AT, Clarke AG, McClay I, Harvey J, Dunnett KE, Johnson JR, Jackson GE, Greenstone MA, Sekhawat BS, Wright A, Bird HA, Kumar MSA, Speculand B, Sibley G, Seath KR, Pollard JP, Jones JB, Hankey S, Shanmugham MJ, Sharpe DT, Gannaway RM, French AJ, MacFarlane DG, Henderson NJ, Fasher B, Avery AF, Bailey SSH, Hinton W, Brown GJ, Bryant BM, Chilton CP, Watts MR, West JA, Shihata MR, Thompson JA, Pelmore MH, Clark RM, House W, Chisholm-Batten RE, Mousawi A, Duffield R, Rimmer R, Davis I, Vaughton KC. Junior Hospital Staff Contract. West J Med 1975. [DOI: 10.1136/bmj.2.5971.619-c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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631
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632
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Smith LL, Wright A, Wyatt I, Rose MS. Effective treatment for paraquat poisoning in rats and its relevance to treatment of paraquat poisoning in man. BRITISH MEDICAL JOURNAL 1974; 4:569-71. [PMID: 4434142 PMCID: PMC1612746 DOI: 10.1136/bmj.4.5944.569] [Citation(s) in RCA: 88] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
After oral administration of a lethal dose of paraquat to rats the plasma concentration remained relatively constant over four to 30 hours and was related to the paraquat content of the small intestine over the first 16 hours. During the first 30 hours the concentration of paraquat in the lung rose progressively above that of the plasma to levels which are known to cause pulmonary damage. A treatment has been devised which prevents the absorption of paraquat into the plasma and prevents accumulation of paraquat in the lung. This treatment consists of a stomach was followed by four administrations of bentonite plus purgatives at two- to three-hour intervals. Even when treatment was delayed until 10 hours after administration of paraquat 80% survival was obtained. The relevance of this treatment to paraquat poisoning in man is discussed in the light of the finding that slices of human lung accumulate paraquat in the same way as those of rat lung.
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633
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Susskind MM, Wright A, Botstein D. Superinfection exclusion by P22 prophage in lysogens of Salmonella typhimurium. IV. Genetics and physiology of sieB exclusion. Virology 1974; 62:367-84. [PMID: 4610993 DOI: 10.1016/0042-6822(74)90399-7] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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634
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Susskind MM, Botstein D, Wright A. Superinfection exclusion by P22 prophage in lysogens of Salmonella typhimurium. III. Failure of superinfecting phage DNA to enter sieA+ lysogens. Virology 1974; 62:350-66. [PMID: 4610992 DOI: 10.1016/0042-6822(74)90398-5] [Citation(s) in RCA: 95] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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635
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Guterman SK, Wright A. Effects of a mutator mutation of Salmonella typhimurium on P22 and R factor genes. J Bacteriol 1974; 119:638-9. [PMID: 4604400 PMCID: PMC245653 DOI: 10.1128/jb.119.2.638-639.1974] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A mutator mutation of Salmonella typhimurium, observed in a strain resistant to P22 and rifampin, affects mutation rates of bacterial, R factor, and prophage P22 genes.
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636
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Marshall AT, Wright A. Ultrastructure changes associated with osmoregulation in the hindgut cells of a saltwater insect, Ephydrella sp. (Ephydridae: Diptera). Tissue Cell 1974; 6:301-18. [PMID: 4416776 DOI: 10.1016/0040-8166(74)90055-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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637
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Wallace A, Wright A. Novel Simulation of Cage Windings Based on Mesh Circuit Model. ACTA ACUST UNITED AC 1974. [DOI: 10.1109/tpas.1974.293957] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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638
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Beal RW, Wright A. The effect of anticoagulants on the dialysis method of measurement of vitamin B 12 binding capacity of plasma proteins. Pathology 1973; 5:291-5. [PMID: 4205327 DOI: 10.3109/00313027309073756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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639
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Wan TT, Wright A. Occupational differentials in chronic disability. JOURNAL OF OCCUPATIONAL MEDICINE. : OFFICIAL PUBLICATION OF THE INDUSTRIAL MEDICAL ASSOCIATION 1973; 15:493-500. [PMID: 4704227] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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640
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Kanegasaki S, Wright A. Studies on the mechanism of phage adsorption: interaction between phage epsilon15 and its cellular receptor. Virology 1973; 52:160-73. [PMID: 4803392 DOI: 10.1016/0042-6822(73)90406-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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641
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642
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Cunningham TJ, Olson KB, Horton J, Wright A, Hussain M, Davies JN, Harrington G. A clinical trial of intravenous and intracavitary bleomycin. Cancer 1972; 29:1413-9. [PMID: 4112172 DOI: 10.1002/1097-0142(197205)29:5<1413::aid-cncr2820290544>3.0.co;2-r] [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: 01/08/2023]
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643
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644
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Brett D, Jackson J, Wright A. Nursing care study: abortion--with complications. NURSING TIMES 1971; 67:1209-10. [PMID: 5095358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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645
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Bradley EL, Holmes WN, Wright A. The effects of neurohypophysectomy on the pattern of renal excretion in the duck (Anas platyrhynchos). J Endocrinol 1971; 51:57-65. [PMID: 5125394 DOI: 10.1677/joe.0.0510057] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
SUMMARY
Renal excretion in intact, sham-operated and neurohypophysectomized ducks was studied. Neurohypophysectomy produced immediate and profound polydipsia and polyuria. These conditions steadily diminished during the first 2 weeks after the operation and by the 14th day they had stabilized at levels which were approximately three times higher than the corresponding values in sham-operated birds. The stabilized levels of polydipsia and polyuria persisted throughout the remainder of the 60–90 day experimental period. The rates of excretion of Na+, Cl− and total osmotically active material were also increased when compared with intact or sham-operated birds. No change in the rate of K+ excretion was observed.
The i.m. administration of vasopressin reduced the rate of urine flow to that observed in the control birds but the rates of electrolyte excretion were not restored to normal. Synthetic oxytocin had no antidiuretic effect in the neurohypophysectomized birds. Arginine vasotocin treatment restored the rates of both water and ion excretion to values very close to those observed in intact and sham-operated birds.
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646
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Peaker M, Peaker SJ, Phillips JG, Wright A. The effects of corticotrophin, glucose and potassium chloride on secretion by the nasal salt gland of the duck, Anas platyrhynchos. J Endocrinol 1971; 50:293-9. [PMID: 4326221 DOI: 10.1677/joe.0.0500293] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
SUMMARY
Ducks given corticotrophin (ACTH) i.m. for 5 days secreted significantly more nasal fluid in response to an i.v. injection of 0·5 m-NaCl. However, blood glucose and plasma potassium concentrations also increased in the birds given ACTH and when these changes in blood composition were produced by injecting glucose or KC1, an effect similar to that of ACTH was obtained, suggesting that glucocorticoids influence the salt gland indirectly rather than, or as well as, directly. The concentrations of Na+ and K+ in the nasal fluid were decreased by ACTH, an effect not mimicked by glucose or KC1, and this might suggest some direct influence on water movements in the salt gland. ACTH increased nasal secretion in response to a minimal stimulatory salt load approximately 15 min after i.v. injection and this increase coincided with a marked rise in blood glucose concentration.
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647
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Wright A, Barzilai N. Isolation and haracterization nonconverting mutants of bacteriophage epsilon 34. J Bacteriol 1971; 105:937-9. [PMID: 5547997 PMCID: PMC248521 DOI: 10.1128/jb.105.3.937-939.1971] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
epsilon(34) Is a converting bacteriophage which brings about a glucosylation of the O antigen in the E group salmonella, thus producing antigen 34. Uridine diphosphate glucose is the precursor of antigen 34 and a glucosyl-lipid is an essential intermediate in this process. Mutants of epsilon(34) which cannot produce antigen 34 have been isolated. Cells lysogenic for these mutants are of two types. Type 1 mutant lysogens cannot form the glucosyl-lipid intermediate; those of type 2 can form glucosyl-lipid but are unable to transfer glucose from the lipid to the O antigen.
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648
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Abstract
The structural determinants for antigen 34 in the E group salmonella are glucosyl substituents on the galactosyl units of the O antigen which has a mannosylrhamnosylgalactose repeating sequence. The temperate bacteriophage epsilon(34) brings about the production of antigen 34. It has been shown here that glucose is transferred from uridine diphosphate glucose to the O antigen via a glucosyl-lipid intermediate in a two-step reaction. Glucose is linked through carbon 1 to the lipid by a phosphodiester bridge, the glucosyl bond having the beta-anomeric configuration. The lipid is a C(55)-polyisoprenoid alcohol, each isoprene unit having one double bond. It is the same lipid which is involved in the synthesis of the O antigen repeating sequence.
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649
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650
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Kanegasaki S, Wright A. Mechanism of polymerization of the Salmonella O-antigen: utilization of lipid-linked intermediates. Proc Natl Acad Sci U S A 1970; 67:951-8. [PMID: 5289031 PMCID: PMC283297 DOI: 10.1073/pnas.67.2.951] [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: 01/14/2023] Open
Abstract
Cell envelope fractions from Salmonella can utilize exogenous lipid-linked intermediates for the synthesis of polymeric O-antigen. We describe a method for preparing aqueous suspensions of lipid intermediates and show that freezing and thawing of cell envelope-lipid intermediate mixtures is required for efficient synthesis. The lipid intermediates move freely in the hydrophobic environment of the membrane.
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