376
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Baggerman C, Brandsema C, Humer M, Visser J. A comparative study on the performance of asbestos-free depth-filters for removal of pyrogens from infusion fluids. J Pharm Pharmacol 1981; 33:685-91. [PMID: 6118405 DOI: 10.1111/j.2042-7158.1981.tb13905.x] [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: 01/18/2023]
Abstract
Three asbestos-free depth-filters were compared with traditionally used asbestos-containing depth-filters for chemical integrity, physical integrity and pyrogen retention. With chemical and physical integrity only minor differences between the various filter types were seen. One asbestos-free depth-filter, based on charcoal, showed poor pyrogen-retention; this might be due to a high flow rate used. Asbestos-free depth-filters based on kieselguhr or on a mixture of kaolin and alumina proved to be good alternatives; these filters have proved to be suitable for the removal of pyrogens from electrolyte- or carbohydrate-containing infusion fluids.
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377
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Visser J. The concept of negative hamaker coefficients. 1. history and present status. Adv Colloid Interface Sci 1981. [DOI: 10.1016/0001-8686(81)80007-3] [Citation(s) in RCA: 68] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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378
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Bos CJ, Slakhorst M, Visser J, Roberts CF. A third unlinked gene controlling the pyruvate dehydrogenase complex in Aspergillus nidulans. J Bacteriol 1981; 148:594-9. [PMID: 7028719 PMCID: PMC216244 DOI: 10.1128/jb.148.2.594-599.1981] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Pyruvate dehydrogenase complex mutants of Aspergillus nidulans were obtained by ultraviolet treatment and enrichment procedures. Among 160 glycolytic mutants, 86 pyruvate dehydrogenase complex mutants (including some temperature-sensitive mutants) were found. In addition to genes pdhA and pdhB, which are described in previous studies, a third gene, pdhC, controlling the function of the enzyme complex, was identified. The three genes were not linked and were mapped in the following linkage groups: pdhA in group I, pdhB in group V, and pdhC in group VIII, where it was the first marker on the left arm.
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379
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Martin DG, Biles C, Gerpheide SA, Hanka LJ, Krueger WC, McGovren JP, Mizsak SA, Neil GL, Stewart JC, Visser J. CC-1065 (NSC 298223), a potent new antitumor agent improved production and isolation, characterization and antitumor activity. J Antibiot (Tokyo) 1981; 34:1119-25. [PMID: 7328053 DOI: 10.7164/antibiotics.34.1119] [Citation(s) in RCA: 111] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
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380
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van den Engh G, Trask B, Visser J. Surface antigens of pluripotent and committed haemopoietic stem cells. HAEMATOLOGY AND BLOOD TRANSFUSION 1981; 26:305-8. [PMID: 7033069 DOI: 10.1007/978-3-642-67984-1_52] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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381
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Jeyaseelan K, Guest JR, Visser J. The pyruvate dehydrogenase complex of Pseudomonas aeruginosa PAO Purification, properties and characterization of mutants. JOURNAL OF GENERAL MICROBIOLOGY 1980; 120:393-402. [PMID: 6785386 DOI: 10.1099/00221287-120-2-393] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The pyruvate dehydrogenase complex of Pseudomonas aeruginosa PAO was purified by affinity chromatography on ethanol-Sepharose 2B followed by sucrose density gradient centrifugation. The overall purification was 130-fold based on enzyme activity. The purified complex contained three major and one minor polypeptide components when analysed by sodium dodecyl sulphate-polyacrylamide gel electrophoresis. These were identified by heat treatment, limited proteolysis and peptide mapping as pyruvate dehydrogenase (El; Mr 92500), acetyltransferases (E2; major component, Mr 76000, and minor component, Mr 77800) and lipoamide dehydrogenase (E3; Mr 58000). The purified complex had a sedimentation coefficient of 48S and the specific activity for the overall reaction of the complex was 6.5 micromol substrate transformed (mg protein)-1 min-1 at the optimum pH (7.8) and 25 degrees C. The lesions in four ace mutants lacking overall pyruvate dehydrogenase complex activity were identified after partial purification of the corresponding cell-free extracts. Three strains, designated ace A mutants, lacked pyruvate dehydrogenase activity (E1 component) and one strain, and ace B mutant, lacked the activity of the acetyltransferase (E2 component).
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382
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Visser J. Praise from a regular reader. BULLETIN OF THE MEDICAL LIBRARY ASSOCIATION 1980; 68:250. [PMID: 16017788 PMCID: PMC226488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
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383
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Bol S, Visser J, van den Engh G. The physical separation of three subpopulations of granulocyte/macrophage progenitor cells from mouse bone marrow. Exp Hematol 1979; 7:541-53. [PMID: 317650] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The heterogeneity among progenitor cells of granulocytes and macrophages capable of forming colonies in vitro (CFU-c) is analysed. If specific culture conditions and stimuli are used, it is possible to discriminate among three subpopulations of CFU-c. CFU-c directly responding to CSF prepared from pregnant mouse uteri are characterized by a density of 1.075 g.cm-3. The G1-phase cells of this CFU-c subpopulation have a sedimentation rate of 4.8 mm.h-1. CFU-c of two additional subpopulations are induced to proliferate by enhancing factors present in serum of mice injected with endotoxin 18 hours earlier and in lysate of rat erythrocytes. CFU-c responding to postendotoxin serum have a density of 1.070 g.cm-3 and a sedimentation rate of 4.3 mm.h-1 (G1 cells). The CFU-c responding to erythrocyte lysate have a density of 1.080 g.cm-3 and a sedimentation rate of 5.3 mm.h-1 (G1 cells). The calculated diameters of G1-phase cells of these three CFU-c subpopulations range from 7.4 to 7.6 micron and are not significantly different. It is proposed that the three CFU-c detected represent three sequential maturation stages of granulocyte/macrophage progenitor cells. These cells are similar in size but increase in density (1.070 g.cm-3 to 1.080 g.cm-3) as they mature.
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384
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Nakajima T, Yasuhara T, Erspamer GF, Visser J. Occurrence of Hyp3-bradykinin in methanol extracts of the skin of the South African leptodactylid frog Heleophryne purcelli. EXPERIENTIA 1979; 35:1133. [PMID: 488255 DOI: 10.1007/bf01963241] [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
Methanol extracts of the skin of the South African amphibians belonging to the genus Heleophryne (H. purcelli purcelli, H. purcelli depressa, H. purcelli orientalis, H. natalensis) contain large amounts (20--500 microgram/g fresh tissue) of Hyp3-bradykinin.
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385
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386
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Visser J, Schaier RW, van Gorkom M. The role of calcium, phosphate and citrate ions in the stabilization of casein micelles. J DAIRY RES 1979; 46:333-5. [PMID: 469062 DOI: 10.1017/s002202990001726x] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
To obtain greater insight into the interaction of Ca, citrate and phosphate ions with casein, 31PNMR measurements were performed on combinations of these ions with alphas- and kappa-caseins. It was found that addition of alphas-casein to a Ca phosphate solution in D2O at 27 degrees C and pD 6.4 resulted in a downfield shift of the 31P singlet. An almost identical shift was observed with kappa-casein, but no shift was found when only phosphate ions were present or when Ca2+ were added to phosphate ions in the absence of casein. Separate experiments with poly-L-lysine, mol. wt approx. 35,000, resulted in similar downfield 31P chemical shifts of Ca phosphate as with both caseins, whereas no shift was observed when poly-glycine was added. From these results it can be concluded that Ca and phosphate ions associate with casein in a co-operative manner, probably in the way described by ter Horst (1963) as a complex with the NH3+-groups of lysine or arginine in a structure such as: (casein--NH3+)--PO43---Ca2+. The formation of this complex may be enhanced by citrate ions, since preliminary results have shown that addition of Na citrate to a solution of alphas-casein with added Ca phosphate produces a broadening of the 31P signal as well as a chemical shift.
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387
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van den Engh G, Visser J. Light scattering properties of pluripotent and committed haemopoietic stem cells. Acta Haematol 1979; 62:289-98. [PMID: 121672 DOI: 10.1159/000207592] [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: 12/13/2022]
Abstract
Mouse bone marrow cells were separated according to their light scattering properties in a light-activated cell sorter. The intensity of the scattered light was measured in a forward direction (FLS) and perpendicular to the incident light (PLS). These two parameters were found to give an indication of cell size and shape. The fractions containing cells with different light scxattering properties were assayed for CFU-s (pluripotent stem cells) content and for the incidence of three types of CFU-c (cells committed to granulocyte/macrophage differentiation). These measurements confirm previous size calculations based on sedimentation rate and density separation. During maturation, the different colony-forming units (CFU) show a gradual increase in PLS intensity. This suggests that the transition from CFU-s through to CFU-c 3 is accompanied by a morphological differentiation.
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388
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Moolenaar F, Stuurman-Bieze A, Visser J, Huizinga T. Biopharmaceutics of rectal administration of drugs in man I. Introduction of benzoic acid as a test drug. Int J Pharm 1978. [DOI: 10.1016/s0378-5173(78)80003-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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389
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Stuurman-Bieze A, Moolenaar F, Schoonen A, Visser J, Huizinga T. Biopharmaceutics of rectal administration of drugs in man II. Effect of particle size on absorption rate and bioavailability. Int J Pharm 1978. [DOI: 10.1016/s0378-5173(78)80004-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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390
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Visser J, Strating M, van Dongen W. Affinity chromatography studies with the pyruvate dehydrogenase complex of wild-type Escherichia coli. BIOCHIMICA ET BIOPHYSICA ACTA 1978; 524:37-44. [PMID: 350286 DOI: 10.1016/0005-2744(78)90100-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
1. The lifetime of thiamine pyrophosphate-Sepharose 2B affinity matrices synthesized according to Matsuura et al. (Matsuura, A., Iwashina, A. and Nose, Y. (1973) Biochem. Biophys. Res. Commun. 51, 241-246) has been improved. The matrix interacts with bacterial pyruvate dehydrogenase complexes. 2. The synthesis of a stable thiochrome-Sepharose 2B matrix is described. 3. Both matrices bind the pyruvate dehydrogenase complex of Escherichia coli in a 50 mM phosphate buffer, pH 7.0. Elution is possibly by an increase in ionic strength but not by the cofactor or metal-cofactor complexes. 4. The presence of Mg2+, reduces the capacity of the affinity matrices but leads to higher specificity for the multienzyme complex. 5. The pyruvate dehydrogenase complex of E. coli has been successfully purified by combining a classical purification step with these affinity chromatography systems. The method is less suitable for large scale operation.
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391
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Vrij A, Everett DH, Vincent B, Stageman JF, Taylor G, Dawkins JV, Smith AL, Silberberg A, Martin CJ, Hair ML, Dickinson E, Neustadter EL, Stoylov SP, Scholten PC, Tadros TF, Doroszkowski A, Lambourne R, Stein HN, Visser J, van der Scheer A, Norde W, Fijnaut HM, Lips A, Staples EJ, Ottewill RH, Young CA, Waite FA, Osmond DJW, Lyklema J, van Vliet T, Scheutjens JMHM, Fleer GJ, Padday JF, Robb ID, Healy TW, Goodwin JW, Hough DB, Richmond P, Levine S, Jones IS, Derjaguin BV. General discussion. ACTA ACUST UNITED AC 1978. [DOI: 10.1039/dc9786500313] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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392
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Van Megen W, Snook I, Overbeek JTG, Silberberg A, Levine S, White JW, Verwey EJW, Israelachvili JN, Lyklema J, Ottewill RH, Visser J, Vincent B, Tadros TF, van Vliet T, Walstra P, Smitham JB, Klein J, Lips A, Staples EJ. General discussion. ACTA ACUST UNITED AC 1978. [DOI: 10.1039/dc9786500043] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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393
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Visser J, Van Dongen W, Strating M. Ethanolamine, a useful ligand for large scale purification of bacterial pyruvate dehydrogenase complex by affinity chromatography. FEBS Lett 1978; 85:81-5. [PMID: 340269 DOI: 10.1016/0014-5793(78)81253-8] [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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394
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Lyklema J, Frens G, Stoylov SP, Watillon A, Dumont F, Joseph-Petit AM, Smith AL, Stein HN, Ruckenstein E, Cornell RM, Goodwin JW, Ottewill RH, Cooper WD, Healy TW, Tadros TF, Hunter RJ, Scholten PC, Vincent B, Smolders CA, Israelachvili JN, Visser J, Walstra P, Darling DF, Payens TAJ. General discussion. ACTA ACUST UNITED AC 1978. [DOI: 10.1039/dc9786500175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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395
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Bol S, van den Engh G, Visser J. A technique for staining haemopoietic colonies in agar cultures. Exp Hematol 1977; 5:551-3. [PMID: 73473] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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396
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Montecucchi P, Falconieri Erspamer G, Visser J. Occurrence of Asn2, Leu5-caerulein in the skin of the African frog Hylambates maculatus. EXPERIENTIA 1977; 33:1138-9. [PMID: 891852 DOI: 10.1007/bf01922287] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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397
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Anastasi A, Montecucchi P, Erspamer V, Visser J. Amino acid composition and sequence of kassinin, a tachykinin dodecapeptide from the skin of the African frog Kassina senegalensis. EXPERIENTIA 1977; 33:857-8. [PMID: 891753 DOI: 10.1007/bf01951242] [Citation(s) in RCA: 66] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Methanol extracts of the skin of the African amphibian Kassina senegalensis contain a dodecapeptide, kassinin, belonging to the family of tachykinins or physalaemin-like peptides. Kassinin, like all other natural tachykinins, possesses the characteristic C-terminal tripeptide Gly-Leu-Met-NH2 and a phenylalanine residue in position 5 from the C-terminus. However, the amino acid sequence in the N-moiety of the molecule differs sharply from that of the other tachykinins.
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398
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Bresters TW, de Abreu RA, de Kok A, Visser J, Veeger C. The pyruvate-dehydrogenase complex from Azotobacter vinelandii. EUROPEAN JOURNAL OF BIOCHEMISTRY 1975; 59:335-45. [PMID: 1204621 DOI: 10.1111/j.1432-1033.1975.tb02460.x] [Citation(s) in RCA: 61] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
The pyruvate dehydrogenase complex from Axotobacter vinelandii was isolated in a five-step procedure. The minimum molecular weight of the pure complex is 600,000, as based on an FAD content of 1.6 nmol-mg protein-1. The molecular weight is 1.0-1.2 X 10(6), indicating 1 mole of lipoamide dehydrogenase dimer per complex molecule. Sodium dodecylsulphate gel electrophoretical patterns show that apart from pyruvate dehydrogenase (Mr89,000) and lipoamide dehydrogenase (Mrmonomer 56,000) two active transacetylase isoenzymes are present with molecular weight on the gel 82,000 and 59,000 but probably actually lower. The pure complex has a specific activity of the pyruvate-NAD+ reductase (overall) reaction of 10 units-mg protein-1 at 25 degrees C. The partial reactions have the following specific activities in units-mg protein-1 at 25 degrees C under standard conditions: pyruvate-K3Fe(CN)6 reductase 0.14, transacetylase 3.6 and lipoamide dehydrogenase 2.9. The properties of this complex are compared with those from other sources. NADPH reduced the FAD of lipoamide dehydrogenase as well in the complex as in the free form. NADP+ cannot be used as electron acceptor. Under aerobic conditios pyruvate oxidase reaction, dependent on Mg2+ and thiamine pyrophosphate, converts pyruvate into CO2 and acetate; V is 0.2 mumol 02-min-1-mg-1, Km(pyruvate)0.3 mM. The kinetics of this reaction shows a linear 1/velocity-1/[pyruvate] plot. K3Fe(CN)6 competes with the oxidase reaction. The oxidase activity is stimulated by AMP and sulphate and is inhibited by acetyl-CoA. The partially purified enzyme contains considerable phosphotransacetylase activity. The pure complex does not contain this activity. The physiological significance of this activity is discussed.
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399
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Visser J, Strating M. Enzymatic behaviour of lipoamide dehydrogenase isoenzymes immobilized on N-alkyl sepharose matrices. FEBS Lett 1975; 57:183-6. [PMID: 170136 DOI: 10.1016/0014-5793(75)80712-5] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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400
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Visser J, Strating M. Separation of lipoamide dehydrogenase isoenzymes by affinity chromatography. BIOCHIMICA ET BIOPHYSICA ACTA 1975; 384:69-80. [PMID: 165834 DOI: 10.1016/0005-2744(75)90096-0] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
1. Lipoamide dehydrogenase NADH: lipoamide oxidoreductase, (EC 1.6.4.3) from pig heart has been separated into two sets of isoenzymes by chromatography on lipoyl- and NAD+-derivatized Sepharose-4B matrices. The first fraction is eluted at 30 mM sodium phosphate buffer (pH 7.2), the other requires a higher ionic strength. The two groups originate from the alpha-ketoglutarate and the pyruvate dehydrogenase complex respectively. 2, Hydrophobic chromatography on a homologous series of alkyl-Sepharoses lead to similar results. The first fraction is eluted with 30 mM phosphate buffer in the case of propyl- and butyl-Sepharose but a high ionic strength is required in the case of an increased chain length (C5--C6). The second fraction is reversibly bound on Sepharose-NC3 and -NC4 but binding becomes irreversible at higher chain lengths. 3. Aminoalkyl-Sepharose behave qualitatively as the alkyl derivatives although elution, particularly in the case of the second fraction, can be realized at lower ionic strength. 4. Matrices which are negatively charged (Sepharose-NCnCOOH, n equal 3--7) have no affinity at pH 7.2. 5. The influence of a neutral polar substituent has been studied by comparing the following matrices: Sepharose-NC6OH, Sepharose-NC6NH2 and Sepharose NC6. Binding of the various isoenzymes is completely reversible in the case of a Sepharose-NC6OH matrix and the elution behaviour is identical to that on propyl- and butyl matrices.
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