Library

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
  • 1
    Electronic Resource
    Electronic Resource
    Solid–liquid phase transition of Lennard-Jones fluid in slit pores under tensile condition (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 9909-9916 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: The effect of equilibrium vapor-phase pressure onto freezing of a simple fluid in a nanopore is examined. We employ a molecular dynamics (MD) technique in a unit cell with imaginary gas phase, which has the benefit of easy determination of equilibrium vapor pressure. The method is shown to give consistent results with those by the grand canonical Monte Carlo (GCMC) method, and to have better feature of smaller degree of hysteresis between freezing and melting. The MD simulations showed liquid–solid phase transitions, at a constant temperature, with the variation in the equilibrium vapor-phase pressure below the saturated one. Thus-determined solid–liquid coexistence lines exhibited significant dependence of the freezing point against small changes in the bulk–phase vapor pressure, which implies the importance of tensile effect on freezing in nanopores. The capillary effect on the shift in freezing point was successfully described by a simple model based on continuum and isotropic assumption, even in a pore as small as 2 nm in width. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481643
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Development and application of thermo-sensitive magnetic immunomicrospheres for antibody purification (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 99-105 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract. Ultrafine magnetite particles were prepared by a co-precipitation method. The poly-(styrene/N-isopropylacrylamide/methacrylic acid) latex particles containing ultrafine magnetite [magnetic P(St/NIPAM/MAA)] were prepared by two-step emulsifier-free emulsion polymerization. The minimum NaCl concentration for flocculation of these magnetic latex particles (critical flocculation concentration, CFC) decreased with increasing temperature. These temperature dependence of CFC, namely its thermo-sensitivity, originated from NIPAM. At a certain NaCl concentration, some of the magnetic latex particles showed reversible transition between flocculation and dispersion by controlling the temperature, and the thermo-flocculated magnetic latex particles were separated quickly in a magnetic field. Bovine serum albumin (BSA) was covalently immobilized onto the magnetic P(St/NIPAM/MAA) latex particles with high efficiency by the carbodiimide method. These thermo-sensitive magnetic immunomicrospheres were effective for the immunoaffinity purification of anti-BSA antibodies from antiserum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166089
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Kinetic and circular dichroism studies of enzymes adsorbed on ultrafine silica particles (1993)
    Springer
    Applied microbiology and biotechnology 39 (1993), S. 726-731 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Negatively charged ultrafine silica particles (average diameter 20 nm) were used as support materials for adsorption immobilization of porcine trypsin, horseradish peroxidase, and bovine catalase under various conditions, and the changes in the enzyme activities and the circular dichroism (CD) spectra of these enzymes upon adsorption were measured. Since the light scattering intensity of the ultrafine particles was very low, the activities and the CD spectra of the enzymes adsorbed on the particle surfaces could be measured. The enzymes adsorbed at pH around and above their isoelectric points (pI) showed high activities. On the other hand, the enzymes adsorbed at pHs below their pI had significantly diminished activities and showed large CD spectral changes upon adsorption. The extent of CD spectral changes in the enzymes upon adsorption correlated very closely with that of the activity reduction. Therefore, the conformational changes in enzymes upon adsorption are one of the important factors that reduce the activities of adsorbed enzymes. These results demonstrate that the ultrafine particles are not only a novel support for enzyme immobilization but also are helpful for the molecular understanding of the immobilized enzymes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00164457
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Purification of fusion proteins using affinity microspheres in aqueous two-phase systems (1993)
    Springer
    Applied microbiology and biotechnology 40 (1993), S. 365-369 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Affinity microspheres were prepared by immobilizing human γ-globulin (HγGb) onto carboxylated poly (styrene/acrylamide) latex particles [P(St/AAm)-H; average diameter 0.33 μm], which were prepared by emulsifier-free emulsion polymerization. HγGB was covalently immobilized onto the latex particles with high efficiency by the carbodiimide method. A fusion protein (ZZB1B2) of immunoglobulin G and albumin-binding domains (ZZ and B1B2, respectively) was expressed intracellularly and extracellularly in Escherichia coli and was purified by the affinity microspheres. In poly (ethylene glycol) (PEG)/potassium phosphate aqueous two-phase system, the affinity microspheres were partitioned into the PEG-rich top phase, while cells and cell debris of E. coli were displaced into the salt-rich bottom phase. Therefore, ZZB1B2 was directly purified from cell disintegrate or culture broth by combining the affinity microspheres with the aqueous two-phase partitioning, and its purity was almost the same as that purified by conventional affinity chromatography. Therefore, by this purification method, the primary purification process and the subsequent high resolution purification process are combined, and the number of purification steps can be reduced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00170394
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Development and application of thermo-sensitive magnetic immunomicrospheres for antibody purification (1994)
    Springer
    Applied microbiology and biotechnology 41 (1994), S. 99-105 
    Details
    ISSN: 1432-0614
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Ultrafine magnetite particles were prepared by a co-precipitation method. The poly-(styrene/N-isopropylacrylamide/methacrylic acid) latex particles containing ultrafine magnetite [magnetic P(St/NIPAM/MAA)] were prepared by two-step emulsifier-free emulsion polymerization. The minimum NaCl concentration for flocculation of these magnetic latex particles (critical flocculation concentration, CFC) decreased with increasing temperature. These temperature dependence of CFC, namely its thermo-sensitivity, originated from NIPAM. At a certain NaCl concentration, some of the magnetic latex particles showed reversible transition between flocculation and dispersion by controlling the temperature, and the thermo-flocculated magnetic latex particles were separated quickly in a magnetic field. Bovine serum albumin (BSA) was covalently immobilized onto the magnetic P(St/NIPAM/MAA) latex particles with high efficiency by the carbodiimide method. These thermo-sensitive magnetic immunomicrospheres were effective for the immunoaffinity purification of anti-BSA antibodies from antiserum.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00166089
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Development and application of thermo-sensitive immunomicrospheres for antibody purification (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 44 (1994), S. 1-6 
    Details
    ISSN: 0006-3592
    Keywords: antibody purification ; latex particles, thermo-sensitive ; immunomicrospheres ; N-isopropylacrylamide ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The latex particles composed of poly(styrene/N-isopropylacrylamide/glycidyl methacrylate) [P(St/NIPAM/GMA)] and poly(styrene/N-isopropylacrylamide/methacrylic acid) [P(St/NIPAM/MAA)] were prepared by emulsifier-free emulsion polymerization. These latex particles with submicrometer size showed the thermosensitivity originated from the thermo-sensitive nature of NIPAM. That is, the minimum NaCI concentration for flocculation of these latex particles [critical flocculation concentration (CFC)] decreased significantly with increasing temperature and reached constant values at above the critical temperature [critical flocculation temperature (CFT)]. At a certain NaCl concentration, the thermo-sensitive latex particles were flocculated by raising temperature, and conversely, the flocculated thermo-sensitive latex particles were completely dispersed by lowering temperature. Bovine serum albumin (BSA) was covalently immobilized onto the P(St/NIPAM/GMA) and P(St/NIPAM/MMA) latex particles with high efficiency. The BSA-immobilized P(St/NIPAM/GMA) and P(St/NIPAM/MAA) latex particles (immunomicrospheres) showed the similar dependencies of CFC on temperature to the bare latex particles. These thermo-sensitive immunomicrospheres were successfully used for the immunoaffinity purification of anti-BSA antibodies from antiserum. © 1994 John Wiley & Sons, Inc.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260440102
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Circular dichroism studies on conformational changes in protein molecules upon adsorption on ultrafine polystyrene particles (1992)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 40 (1992), S. 889-894 
    Details
    ISSN: 0006-3592
    Keywords: protein adsorption ; protein conformation ; ultrafine particles ; circular dichroism ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The conformational changes in well-characterized model proteins [bovine ribonuclease A (RNase A), horseradish peroxidase, sperm-whole myoglobin, human hemoglobin, and bovine serum albumin (BSA)] upon adsorption on ultrafine polystyrene (PS) particles have been studied using circular dichroism (CD) spectroscopy. These proteins were chosen with special attention to molecular flexibility. The ultrafine PS particles were negatively charged and have average diameters of 20 or 30 nm. Utilization of these ultrafine PS particles makes it possible to apply the CD technique to determine the secondary structure of proteins adsorbed on the PS surface. Effects of protein properties and adsorption conditions on the extent of the changes in the secondary structure of protein molecules upon adsorption on ultrafine PS particles were studied. The CD spectrum changes upon adsorption were significant in the “soft” protein molecules (myoglobin, hemoglobin, and BSA), while they were insingnificant in the “rigid” proteins (RNase A and peroxidase). The soft proteins sustained a marked decrease in α-helix content upon adsorption. Moreover, the native α-helix content, which is given as the percentage of the α-helix content in the free proteins, of adsorbed BSA was found to decrease with decreasing pH and increase with increasing adsorbed amount. These observations confirm some well-known hypotheses for the confirmational chages in protein molecules upon adsorption. © 1992 John Wiley & Sons, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260400804
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Development and application of thermo-sensitive immunomicrospheres for antibody purification (1994)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 44 (1994), S. 395-395 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260440320
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Adsorption of γ-globulin, a model protein for antibody, on colloidal particles (1991)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 37 (1991), S. 537-543 
    Details
    ISSN: 0006-3592
    Keywords: colloidal particles ; γ-globulin ; adsorption ; Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: The effect of surface properties on the adsorption of bovine γ-globulin, a model protein for antibody, was studied. Polystyrene latex (PS), hydrophilic copolymer lattices of styrene/2-hydroxyethyl methacrylate [P(S/HEMA)], styrene/ methacrylic acid [P(S/MAA)] and methyl methacrylate/ 2-hydroxyethyl methacrylate [P(MMA/HEMA)], and colloidal silica were used. The adsorption isotherms of γ-globulin on these colloidal particles were measured as a function of pH and ionic strength. The hydrophilic particles showed low affinities for γ-globulin at alkaline pH, while PS showed high affinities for γ-globulin over the whole range of pH and ionic strength. The γ-globulin adsorption on hydrophilic particles was highly reversible with respect to the pH and ionic strength compared with that on PS. These differences indicate that the dominant driving forces of adsorption are related to the hydrophilicity of particles. The adsorption isotherms of all colloidal particles showed the plateau values, and the order of maximum values of plateau adsorption was P(S/MAA) 〉 PS or P(S/HEMA), silica 〉 P(MMA/HEMA). Thus, they were also affected by the charged groups and the hydrophilicity of the surfaces. On the other hand, the plateau values of all colloidal particles were more or less symmetrical with a maximum at around the isoelectric point of γ-globulin at an ionic strength of 0.01. This behavior is attributed to the important role of the lateral interaction between the adsorbed molecules at low ionic strength.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260370607
    Library Location Call Number Volume/Issue/Year 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...