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Digitale Medien

A histidine binding protein ofEscherichia coli: a component of cystine binding protein ofEscherichia coli (1993)

Butler, J. DeBrohun ; Levin, S. Warren ; Facchiano, A. ; [weitere]

Springer

Amino acids 5 (1993), S. 39-50

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ISSN: 1438-2199

Schlagwort(e): Amino acids ; Histidine ; Cystine ; Amino acid binding proteins

Quelle: Springer Online Journal Archives 1860-2000

Thema: Medizin

Notizen: Summary Commercially obtained cystine binding protein (CBP), an osmotic shock protein ofEscherichia coli, was studied in an effort to determine its binding characteristics. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS/PAGE) analysis of commercially obtained CBP showed three protein bands. N-terminal amino acid microsequencing and subsequent computer search revealed that the sequence of one of these proteins (25-kDa) was nearly identical to histidine binding protein (HisJ) ofSalmonella typhimurium. Purification of CBP by HPLC yielded four protein peaks, of which one bound histidine exclusively. Binding was maximal at pH 5.0 to 6.0, at 4°C, did not require calcium or magnesium ions and was not inhibited by reduction of CBP disulfide bonds. Amino acids other than histidine or cystine did not bind to CBP. These data show that commercially available CBP is not a homogenous protein; it contains a histidine as well as a cystine binding component.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00806191

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Digitale Medien

Thermal studies on brominated atactic polypropylene (1992)

Mukherjee, A. K. ; Mohan, Anita

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 44 (1992), S. 773-779

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Thermal behavior of brominated atactic polypropylene (BAPP), obtained by thermal bromination of atactic polypropylene (APP), was evaluated by thermogravimetric analysis (TGA) and differential thermal analysis (DTA). It was found that the initial decomposition temperature (IDT) and char yield increase with the increase in bromine content while integral procedural decomposition temperature (IPDT) showed a decreasing trend. A comparative study of these value in inert and oxidative atmospheres has been made. DTA study shows that onset decomposition temperature (ODT) and glass transition temperature (Tg) increase with the increase in degree of bromination. The possible reasons for the occurring phenomena have been discussed.

Zusätzliches Material: 8 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1992.070440504

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Digitale Medien

Adhesion studies of tyre cords with rubber. I. Synthesis and characterization of natural rubber graft copolymers (1992)

Egboh, S. H. O. ; Mukherjee, A. K.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 44 (1992), S. 233-238

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: Glycidyl methacrylate and N-vinyl pyrrolidone have been grafted onto natural rubber at 32°C using the simultaneous cobalt-60 irradiation technique. The natural rubber samples were swollen in the monomers for 24 h and thereafter subjected to gamma irradiation. The homopolymers formed in the graft copolymerization reactions and unreacted monomer were removed by solvent extraction using acetone and methanol for glycidyl methacrylate and N-vinyl pyrrolidone monomer, respectively. The influence of total dose and monomer concentration on the graft parameters was investigated. The dependence of the rate of grafting on the monomer concentration was found to be 0.93 and 0.80 for glycidyl methacrylate and N-vinyl pyrrolidone, respectively. DSC and TGA studies of the polymers were undertaken. Grafted copolymers based on glycidyl methacrylate were relatively less thermally stable compared with ungrafted natural rubber.

Zusätzliches Material: 6 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1992.070440206

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Digitale Medien

Electrical properties of chlorinated atactic polypropylene (CAPP) and PVC-DOP-CAPP system (1990)

Mukherjee, A. K. ; Patri, M.

New York, NY [u.a.] : Wiley-Blackwell

Journal of Applied Polymer Science 39 (1990), S. 1485-1493

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ISSN: 0021-8995

Schlagwort(e): Chemistry ; Polymer and Materials Science

Quelle: Wiley InterScience Backfile Collection 1832-2000

Thema: Chemie und Pharmazie , Maschinenbau , Physik

Notizen: The electrical properties, such as dielectric properties and volume resistivity, of chlorinated atactic polypropylene(CAPP), obtained by thermal chlorination of APP, have been studied. The results show that dielectric constant, loss tangent, and volume resistivity of the chlorinated samples increase with the increase in degree of chlorination. The effect of CAPP as secondary plasticizer in the PVC-DOP system has also been studied. Dielectric study of PVC compounds shows a single relaxation peak, indicating no phase separation. In the case of PVC compounds, it has been observed that with the increase in CAPP content in PVC compounds dielectric constant and loss tangent decrease whereas volume resistivity increases. The increase in volume resistivity was further supported by the increase in activation energy value, obtained from volume resistivity vs. 1/T plot.

Zusätzliches Material: 3 Ill.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/app.1990.070390707

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Digitale Medien

Endgroup studies in poly (methyl methacrylate) initiated by redox systems containing reducing sulfoxy compounds in aqueous media (1966)

Mukherjee, A. R. ; Ghosh, P. ; Chadha, S. C. ; [weitere]

New York : Wiley-Blackwell

Die Makromolekulare Chemie 97 (1966), S. 202-208

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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

Beschreibung / Inhaltsverzeichnis: An Polymethylmethacrylaten, durch Redoxinitiierung in wäßriger Lösung dargestellt, wurden kolorimetrische Endgruppenbestimmungen durchgeführt. Die Redoxsysteme bestanden aus einer Sulfoxygruppe, HSO3-, SO2-3, S2O2-3, S2O2-4 oder S2O2-5 als Reduktionsmittel und einem der folgenden Aktivatoren: (a) Metallionen: Cu2+, Fe3+ und Ag+; (b) Kaliumchlorat und -bromat; (c) Wasserstoffperoxid und (d) Sauerstoff.Als Endgruppen werden im Falle (a) und (b) nur hydrolysebeständige Sulfoxygruppen eingebaut, bei (c) und (d) sowohl Sulfoxy- als auch Hydroxylgruppen.

Notizen: Poly(methyl methacrylate) samples obtained by aqueous redox initiation with reducing sulfoxy compounds such as HSO3-, SO2-3, S2O2-3, S2O2-4, and S2O2-5 in conjunction with different activators are analysed for endgroup content by the application of dye techniques, and limiting conditions for polymerization are reported in specific cases. Activators used are: (a) metal ions such as Cu2+, Fe3+, and Ag+ ion; (b) KCIO3 and KBrO3; (c) H2O2, and (d) oxygen. Endgroups incorporated are only nonhydrolysable sulfoxy in case of (a) and (b), and both nonhydrolysable sulfoxy and hydroxyl in case of (c) and (d).

Zusätzliches Material: 3 Tab.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1002/macp.1966.020970118

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