ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Wiley-Blackwell  (24)
  • 1
    Electronic Resource
    Electronic Resource
    Factor affecting enzyme characteristics of bilirubin oxidase suspensions in organic solvents (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 41 (1993), S. 887-893 
    Details
    ISSN: 0006-3592
    Keywords: bilirubin oxidase ; enzymatic activity ; liquid/solid two-phase system ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The activity of bilirubin oxidase toward bilirubin was studied in a liquid/solid two-phase low-water organic system using a simple spectrophotometric assay to follow the reaction. The enzyme was lyophilized from aqueous solution before being suspended in the organic solvent reaction medium. The activity was significantly influenced by the properties of the aqueous medium from which the enzyme was lyophilized, specifically its pH, and the quantity and nature of the buffering species. Analyses of these effect showed that the role of buffering species in such systems went beyond their effect in fixing the protonation state of the enzyme. The activity was also influenced by the quantity of water added to the organic solvent reaction medium. The reaction was shown to follow Michaelis-Menten Kinetics, and Km and kcat were determined. The liquid/solid two-phase system studied was extensively compared to a previously studied water-in-oil microemulsion system © 1993 Wiley & Sons, Inc.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260410908
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Stability of bilirubin oxidase in organic solvent media: A comparative study on two low-water systems (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 41 (1993), S. 894-899 
    Details
    ISSN: 0006-3592
    Keywords: bilirubin oxidase ; enzyme stability in low-water systems ; comparative study of inactivation kinetics ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The storage stability of bilirubin oxidase was studied in water-in-oil CTAB microemulsions with a chloroformrich continuous organic phase. The kinetics of the inactivation process were best described by a double exponential equation. Approximately half of enzymatic activity was lost during a “fast” phase with a half life of ca. 50 min, whereas the remaining activity was lost much more slowly (half life ca. 1000 min). Rates of inactivation were not affected significantly by variation of either solvent composition or concentration of water droplets, but inactivation was more rapid when droplet size was very small. Steady-state enzyme kinetics were studied at various stages in the inactivation process, and it was shown that inactivation occurred without change in the Km of the enzyme for bilirubin. Stability was also studied in a liquid/solid two-phase system; it was found that the inactivation process in this system; it was found that the inactivation process in this system was best described by a single exponential term. The rate was similar to the “fast” phase rate observed in the water-in-oil microemulsion system. Inactivation of the enzyme slow. Addition of the surfactant CTAB to the aqueous environment increased the rate of inactivation to levels comparable to those of the “slow” phase observed in water-in-oil microemulsions. © 1993 Wiley & Sons, Inc.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260410909
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Amplification of the metallothionein-1 and metallothionein-2 genes in copper-resistant hepatoma cells (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Cellular Physiology 147 (1991), S. 434-438 
    Details
    ISSN: 0021-9541
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The molecular basis for increased metallothionein concentrations in copperresistant hepatoma cells was examined. The copper-resistant cell line HAC600, which is maintained in 600 μm copper, had increased steady-state mRNA levels for both the metallothionein-1 (MT-1) and the metallothionein-2 (MT-2) genes. Levels of mRNA were increased 11-fold for MT-1 and 15-fold for MT-2, with no significant change in α-tubulin mRNA content. HAC600NM cells, which are copper-resistant cells kept in a normal copper concentration for over 1 year, also had eight- and tenfold increases in MT-1 and MT-2 mRNA levels. Nuclear run-on assays showed that MT-1 and MT-2 gene transcription was increased nine- and eightfold in HAC600 cells and seven- and tenfold in HAC600NM cells, respectively. Southern blot analysis showed amplification of both metallothionein genes in HAC600 and HAC600NM cells. Thus the molecular basis of increased metallothionein in these hepatoma cells involved a stable gene amplification of both MT genes. The greater increase in metallothionein mRNA levels in HAC600 cells relative to the changes in transcription suggests that posttranscriptional mechanisms of gene regulation may also be acting in these cells.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcp.1041470308
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Polysoaps. III. Polysoaps and related materials prepared by chemical modification of polystyrene (1959)
    Hoboken, NJ : Wiley-Blackwell
    Journal of Polymer Science 40 (1959), S. 15-33 
    Details
    ISSN: 0022-3832
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A detailed description is given of the preparation of an anionic polysoap, poly[styrene co potassium styrylundecanoate], or poly-K-SSU, by the following route. Polystyrene is alkylated with methyl undercylenate in the presence of aluminum chloride; the polyester is then saponsified. Only about 50% of the phenyl groups are alkylated; thus, the structure may be written: Products of molecular weight from 60,000 to 1,760,000 have been prepared. Another anionic polysoap has been made by alkylation with methyl oleate; here, only about 35-39% of the phenyl groups are alkylated, apparently due to steric hindrance. Nonionic polysoaps have been prepared by ester interchange of the unsaponfied methyl esters with methoxy polyethylene glycol. A sulfate ester polysoaps has also been prepared. The properties of poly-K-SSU have been studied in some detail. The solubilizing power, and the viscosity of the aqueous solutions, are comparable to ordinary soaps; but the surface tension of the aqueous solution is very close to that of pure water. The nonionic polysoaps are also good solubilizing agents, e.g., for cholesterol; possible medical applications are considered.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/pol.1959.1204013602
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    A new release of the ASTM CHETAH program for hazard evaluation: Versions for mainframe and personal computer (1989)
    New York, NY : Wiley-Blackwell
    Plant/Operations Progress 8 (1989), S. 100-104 
    Details
    ISSN: 0278-4513
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: CHETAH, which stands for the Chemical Thermodynamic and Energy Release Program, was introduced in 1974. Since then, the CHETAH program has been widely used in the chemical industry for hazard evaluation. Although its chief aim is to predict deflagration/detonation potential from molecular structure, it can also be used to estimate heats of reaction, heat capacities, and entropies. One of the limitations of the original program was its rigid, punched card oriented format for data input and the lack of an overall hazard rating derived from the several hazard criteria. A new release of this program alleviates these shortcomings and includes other improvements. The main features of the new release are: 1) a totally interactive front end, 2) an interpreter subroutine which uses sophisticated pattern recognition techniques to combine the four hazard criteria into an overall hazard rating, 3) recognition of certain atomic groupings which are known to be sensitive, 4) correct handling of the symmetry number, and 5) an updated data bank. One of the most important features of this release is its availability in an IBM PC compatible version, making the program accessible to more users.
    Additional Material: 2 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/prsb.720080215
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Electron spin resonance studies on photodegradable polymers (1977)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 21 (1977), S. 2225-2229 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Films of polyethylene (PE), polypropylene (PP), and polystyrene (PS) containing 1% of selected halogen compounds and films without additives were UV irradiated (253.7 nm) at 77°K and their electron spin resonance (ESR) spectra compared. In each case, the spectra were characteristic of the polymer, and the presence of the additive mainly enhanced the radical yield. No signal was observed for the additives alone after irradiation, suggesting that when incorporated into the polymer, they serve as photosensitizers rather than as primary sources of free radicals in promoting photo-chemical degradation.
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1977.070210819
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Photodegradable vinyl plastics. II. Effect of arylmethyl halides, phenyl halomethyl ketones, and haloalkene additives (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 911-919 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Three classes of active halogen compounds were effective in promoting photodegradation of polystyrene, polypropylene, and polyethylene. The classes are arylmethyl halides, phenyl halomethyl ketones, and haloalkenes. The additives were blended with the polymers and fabricated into films which were irradiated 66-200 hr with a 275-watt RS sunlamp. Photo-oxidation, as determined by IR spectroscopy, was used as a measure of photodegradation. The relationship between the structure of the additive and its effectiveness as a photoinitiator within each of the three classes of compounds is discussed. In general, photoactivated polystyrene was degraded the most, followed by polypropylene and then polyethylene. Viscosity measurements on irradiated polystyrene containing the additives showed significantly greater molecular weight loss than a polystyrene control.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200405
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Photodegradable vinyl plastics. III. Comparison of ultraviolet light and sunlight exposure (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 921-929 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Polystyrene (PS), polypropylene (PP), and polyethylene (PE) films, blended with additives to enhance photodegradability, were irradiated with UV light and sunlight. In almost every case, photodegradation was greater with outdoor exposure than under laboratory conditions. Explanations for the differences in degradation obtained by the two methods of irradiation are discussed. Based on IR measurements and molecular weight determinations, photo-oxidative changes that occur in PS induced by UV light appear similar to those induced by sunlight. In addition to the additives previously reported, several new classes of photoinitiators were evaluated. These include selected halocarbonyl compounds, haloalkyl sulfur compounds, and halogen compounds containing certain electron-withdrawing groups. The performance of the additives in vinyl polymer blends is discussed.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200406
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Photodegradable vinyl plastics. I. Effect of N-halogen additives (1976)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 20 (1976), S. 463-472 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The addition of small amounts of N-halogen compounds to polystyrene (PS), Polypropylene (PP), and polyethylene (PE) enhanced the photodegradability of the resultant plastic films. The effectiveness of the additives varied with their structure and with the polymer. A comparison of N-Bromosuccinimide (NBS) with several known photoinitiators showed it to be superior in effectiveness to all but one. Films were irradiated with a 275-watt RS sunlamp for 66-200 hr. Degradation was measured by increase in carbonyl absorbance at 1750-1695 cm-1 using infrared spectroscopy and by change in viscosity. PS containing NBS underwent a greater molecular weight loss than unmodified PS after UV exposure as determined by viscosity measurements.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1976.070200219
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Solution-phase synthesis of luminescent materials librariesThis work was supported by the US Department of Energy under Contract No. DE-AC03-76SF00098 and by the Office of Naval Research, Order No. N00014-95-F-0099. P.G.S. is a Howard Hughes Medical Institute Investigator. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 1046-1049 
    Details
    ISSN: 0935-9648
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970091311
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...