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1

Digitale Medien

Primary structure and expression of the Xenopus laevis gene encoding annexin II

Gerke, V. ; Koch, W. ; Thiel, C.

Amsterdam : Elsevier

Gene 104 (1991), S. 259-264

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ISSN: 0378-1119

Schlagwort(e): Ca^2^+/lipid-binding proteins ; Recombinant DNA ; cDNA cloning ; calpactin I ; lipocortin II ; tyrosine phosphorylation

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Biologie

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0378-1119(91)90259-E

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2

Digitale Medien

5'-O-demethyl-8-O-methyl-7-epi-dioncophylline a and its 'regularly' configurated atropisomer from Triphyophyllum peltatum

Bringmann, G. ; Rubenacker, M. ; Koch, W. ; [weitere]

Amsterdam : Elsevier

Phytochemistry 36 (1994), S. 1057-1061

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ISSN: 0031-9422

Schlagwort(e): 5'-O-demethyl-8-O-methyl-7-epi-dioncophylline A ; 5'-O-demethyl-8-O-methyl-dioncophylline A ; Dioncophyllaceae ; Triphyophyllum peltatum ; atropisomerism. ; biaryls ; naphthylisoquinoline alkaloids ; stem bark

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Biologie , Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/S0031-9422(00)90491-6

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3

Digitale Medien

The enhancer in an MHC class II gene, in vitro and in mouso

Gerber, P. ; Lang, G. ; Dorn, A. ; [weitere]

Amsterdam : Elsevier

Biochimie 70 (1988), S. 919-925

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ISSN: 0300-9084

Schlagwort(e): enhancer ; gene regulation ; major histocompatibility complex ; transgenic mice

Quelle: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002

Thema: Biologie , Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://linkinghub.elsevier.com/retrieve/pii/0300-9084(88)90233-7

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4

Digitale Medien

Determination of the absolute specific conductance of primary standard KCl solutions (1989)

Wu, Y. C. ; Pratt, K. W. ; Koch, W. F.

Springer

Journal of solution chemistry 18 (1989), S. 515-528

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ISSN: 1572-8927

Schlagwort(e): Absolute standard ; conductivity cell ; demal ; electrolyte ; molality ; potassium chloride ; primary standard ; specific conductance

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract A determination of the absolute specific conductance of KCl solutions is demonstrated. The measurement is based on the conductance cell with a well defined geometry, having a difference in the removable center tube of accurately measured dimensions. The specific conductance of the solution is obtained from the measured resistances of the cell with and without the center tube and the measured l/A ratio of the center tube. Specific conductances obtained using the cell agree with the previously accepted standards for 0.1 demal and 0.01 demal solutions within 0.02%. Results are also presented for solutions based on molality. The temperature control, bridge, and detector technology used to obtain results of this accuracy are described.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00664234

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5

Digitale Medien

Absolute determination of electrolytic conductivity for primary standard KCl solutions from 0 to 50°C (1991)

Wu, Y. C. ; Koch, W. F.

Springer

Journal of solution chemistry 20 (1991), S. 391-401

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ISSN: 1572-8927

Schlagwort(e): Cell constant ; conductance ; demal ; electrolytic conductivity ; potassium chloride ; primary standards ; resistance ; specific conductance

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract An absolute determination of aqueous electrolytic conductivity has been made for primary standards 0.01D and 0.1D (demal) potassium chloride solutions over the temperature range of 0 to 50°C in 5 degree intervals. A cell with a removable center section of accurately known length and area was used for the measurements. Values were adjusted to be in conformity with the ITS-90 temperature scale. The overall uncertainty over the entire temperature range is estimated to be 0.03%. Values at 25°C for 0.01D and 0.1D KCl solutions are 0.0014086 and 0.012852 S-cm−1, respectively.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00650765

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6

Digitale Medien

Thermodynamics of the Second Dissociation Constant and Standards for pH of 3-(NMorpholino) Propanesulfonic Acid (MOPS) Buffers from 5 to 55°C (1998)

Roy, Rabindra N. ; Mrad, Dawn R. ; Lord, P. A. ; [weitere]

Springer

Journal of solution chemistry 27 (1998), S. 73-87

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ISSN: 1572-8927

Schlagwort(e): Dissociation constant ; buffers ; NaMOPS ; temperature dependence ; emf ; Gibbs energy ; enthalpy ; entropy ; heat capacity ; zwitterion ; liquid junction

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The second dissociation constant pK2 of 3-(N-morpholino)propanesulfonic acid (MOPS) has been determined at eight temperatures from 5 to 55°C by measurements of the emf of cells without liquid junction, utilizing hydrogen electrodes and silver–silver chloride electrodes. The pK2 has a value of 7.18 ± 0.001 at 25°C and 7.044 ± 0.002 at 37°C. The thermodynamic quantities ΔG°, ΔH°, ΔS°, and ΔC p o have been derived from the temperature coefficients of the pK 2. This buffer at ionic strength I = 0.16 mol-kg−1 close to that of blood serum, has been recommended as a useful secondary pH standard for measurements of physiological fluids. Five buffer solutions with the following compositions were prepared: (a) equimolal mixture of MOPS (0.05 mol-kg−1) + NaMOPS, (0.05 mol-kg−1); (b( MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1) + NaCl (0.05 mol-kg−1); (c) MOPS (0.05 mol-kg−1) + NaMOPS (0.05 mol-kg−1); + NaCl (0.11mol-kg−1); (d) MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1); and (e)MOPS (0.08 mol-kg−1) + NaMOPS (0.08 mol-kg−1) + NaCl (0.08 mol-kg−1).The pH values obtained by using the pH meter + glass electrode assembly are compared with those measured from a flow–junction calomel cell saturated with KCl (cell B), as well as those obtained from cell (A) without liquid junction at 25 and 37°C. The conventional values of the liquid junction potentials E j have been obtained at 25 and 37°C for the physiological phosphate reference solution as well as for the MOPS buffers (d) and (e) mentioned above.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1023/A:1022692629289

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7

Digitale Medien

Thermodynamic properties of DCl in D2O solution from 5 to 50°C (1986)

Wu, Y. C. ; Koch, W. F. ; Marinenko, G.

Springer

Journal of solution chemistry 15 (1986), S. 675-692

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ISSN: 1572-8927

Schlagwort(e): Deuterium chloride ; deuterium oxide ; electrochemical cell ; emf ; enthalpy ; entropy ; free energy ; heat capacity ; isotope effect ; standard potential ; thermodynamics

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract The themodynamic properties of solutions of deuterium chloride (DCl) in deuterium oxide (D2O) have been determined from emf measurements of the electrochemical cell without transference from 5 to 50°C, and from 0.002 to 1.0 mol-kg−1. The standard potential of the silver/silver chloride electrode relative to the platinum/deuterium electrode has been determined. An equation for the Gibbs energy as a function of temperature has been derived from which the enthalpy, entropy, and heat capacity have been computed. Equations for the activity coefficient and the osmotic coefficient of DCl in D2O have been developed. The excess Gibbs energy of the solution and the excess partial molar free energy as a function of temperature have been calculated, from which the other excess thermodynamic properties have been computed. The values for the heat capacity and the apparent molar heat capacity have been compared with calorimetric data in the literature. The relative partial molar enthalpy has been calculated. The solvent isotope effect on the excess thermodynamic functions is discussed.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00644599

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8

Digitale Medien

Radical ions as chain carriers in polymerization reactions (1985)

Koch, W. ; Risse, W. ; Heitz, W.

New York : Wiley-Blackwell

Die Makromolekulare Chemie 12 (1985), S. 105-123

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ISSN: 0025-116X

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Physik

Notizen: Certain polymerization reactions show the formation of medium molecular weights at the beginning of the reaction, although they can be considered to be polycondensations. The principle of equal reactivity of the end groups is not given in this case. Intermediates more reactive than the monomer are formed during the reaction. Poly(oxy-2,6-dimethyl-l,4-phenylene), poly(l,4-phenylene sulfide) and poly(l,4-phenylene) are examples of this type of reaction. The formation of radical ions in these reactions is discussed and they are compared to Bunnett's SRN1-reactions.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/macp.1985.020121985110

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9

Digitale Medien

Die analytische Chemie im Dienste1 Plenarvortrag auf der Festsitzung der Gesellschaft Deutscher Chemiker anläßlich der ACHEMA am 20. 6. 1970 der Werkstoffentwicklung (1971)

Koch, W.

Weinheim : Wiley-Blackwell

Materialwissenschaft und Werkstofftechnik 2 (1971), S. 135-144

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ISSN: 0933-5137

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Maschinenbau

Beschreibung / Inhaltsverzeichnis: Analytical Chemistry used for developing new materials. The development of new materials constantly confronts the analyst with difficult new problems. Of particular importance for this work would be all methods permitting to lay bare the phase interface and to study their structure and perturbations of this structure. The analyst has to solve these problems in close contact with the technologists specializing in this modern technique.

Notizen: Die Entwicklung neuer Werkstoffe stellt den Analytiker vor immer neue diffizile Aufgaben. Insbesondere dürften alle Verfahren, mit denen es gelingt, Phasengrenzflächen freizulegen und ihren Aufbau sowie Störungen in diesem Aufbau zu studieren, für diese Aufgaben von großer Bedeutung sein. Der Analytiker muß diese Aufgaben in engster Fühlung mit den Technologen, die sich dieser modernen Entwicklung verschrieben haben, lösen.

Zusätzliches Material: 17 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/mawe.19710020305

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10

Digitale Medien

Sodium activity measurements in protein solutions with sodium amalgam electrodesCertain commercial equipment, instruments, or materials are identified in this article to specify adequately the experimental procedure. Such identification does not imply recommendation or endorsement by the National Institute of Standards and Technology, nor does it imply that the materials or equipment identified are necessarily the best available for the purpose. (1991)

Gunaratna, P. C. ; Marinenko, G. ; Koch, W. F.

Weinheim : Wiley-Blackwell

Electroanalysis 3 (1991), S. 125-129

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ISSN: 1040-0397

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie

Notizen: A method using sodium amalgam electrodes has been developed to study the effect of protein on activity measurements and residual liquid junction potential of sodium in protein-containing solutions. It was tested for reliability by application to aqueous sodium chloride solutions before it was applied to protein-containing solutions. The experimentally determined activity coefficients are in good agreement with the activity coefficients for aqueous sodium chloride solutions reported in literature. Therefore, we used this method to measure the activity of NaCl solutions containing varying concentrations of bovine serum albumin (BSA). The electrode slope of the electrode responses in a protein-containing medium does not differ from that of pure aqueous solutions. A functional relationship has been established between the concentration of protein and the percent bias in the measurements. Measurements of electromotive force made in protein-containing solutions do not show any evidence of protein effect on liquid junction potential.

Zusätzliches Material: 2 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/elan.1140030209

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