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  • 1
    Electronic Resource
    Electronic Resource
    Piston-driven ultra rapid pressure swing adsorption (1996)
    Springer
    Adsorption 2 (1996), S. 111-119 
    Details
    ISSN: 1572-8757
    Keywords: pressure swing adsorption ; bulk separation ; experiments ; simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The piston-driven ultra rapid pressure swing adsorption (URPSA) equipment was developed and oxygen enrichment from air was examined as an example. The adsorbent bed is directly connected to the cylinder where a piston moves at high frequency. Thus pressurization and depressurization in the bed are driven by mechanical piston motion, which can achieve far more rapid cycles compared with the conventional pressure swing operation using valves. The cycle time is usually on the order of seconds or sub seconds. Oxygen enrichment from air up to about 60% or higher of oxygen concentration was achieved by small-scale equipment using zeolite 5A with a oxygen production capacity of 100 Nm3-product gas/m3-zeolite/hr, which is about ten times larger than those of commercialized PSAs for this purpose. A simplified numerical model describing the mass transfer taking place in URPSA was developed. The model could simulate fairly well the air separation characteristics in terms of oxygen concentration, oxygen production capacity and oxygen yield. The proposed model helps in the understanding of the basic nature of URPSA and possible applications. This novel PSA is promising as a compact yet high-capacity PSA to be utilized in a wide variety of applications.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00127041
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  • 2
    Electronic Resource
    Electronic Resource
    Activated carbon membrane for water treatments: Application to decolorization of coke furnace wastewater (1997)
    Springer
    Adsorption 3 (1997), S. 93-98 
    Details
    ISSN: 1572-8757
    Keywords: activated carbon ; membrane ; carbon membrane ; water treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract An activated carbon membrane to be used in water treatments was developed and the decolorization of the coke furnace wastewater was successfully demonstrated as a model case. The activated carbon membrane was prepared by carbonizing poly-vinydenchloride (PVdC) and poly-vinylalcohol (PVA) microspheres aggregating on and within a ceramic pipe. The membrane developed in this work was suspected to have a bidispersed structure, which made it possible to play the roles of both a porous membrane having the molecular weight cut-off of about 10,000 and an activated carbon bed where the dissolved organics with low molecular weight could be adsorbed. The activated carbon membrane developed in this work appears to be useful for compact water treatment processes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01133010
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  • 3
    Electronic Resource
    Electronic Resource
    Effects of Surface Oxygen of Activated Carbon on Alkaloid Adsorption: A Molecular Dynamics Simulation Study (1999)
    Springer
    Adsorption 5 (1999), S. 97-108 
    Details
    ISSN: 1572-8757
    Keywords: adsorption ; molecular simulation ; activated carbon ; surface oxygen ; alkaloids
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract The influence of the density and the type of surface oxygen on the adsorption of berberine alkaloid onto activated carbon was investigated using the molecular dynamics simulation method in vacuum. The carbon surface consisted of a basal plane of graphite and surface oxygen groups which were bonded on the graphite plane in a regular square array with various densities. Two types of surface oxygen groups, =O and —OH, were employed. The simulation results showed that the berberine alkaloids were favorable to be adsorbed on the negative charged carbon surfaces. It was indicated that the vdw attraction of the carbon surface to the alkaloid molecule dominates the adsorption only at the lower surface density of oxygen. It is also indicated that a good adsorptive selectivity for a certain berberine alkaloid can be obtained by controlling the density of surface oxygen. The adsorption simulation of berberine alkaloids onto activated carbon in the presence of water was also carried out by using a dome-shape molecular model for presenting the alkaloid/water/carbon system. It was found that the adsorption of berberine alkaloids on the activated carbon which has a higher density of surface oxygen was strongly inhibited by the presence of water.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026479130851
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  • 4
    Electronic Resource
    Electronic Resource
    Editorial (1999)
    Springer
    Adsorption 5 (1999), S. 5-5 
    Details
    ISSN: 1572-8757
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Physics , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026435911248
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  • 5
    Electronic Resource
    Electronic Resource
    A new isolation and purification method for staphylococcal protein A using membrane encapsulated rabbit IgG-agarose (1989)
    New York, NY [u.a.] : Wiley-Blackwell
    Biotechnology and Bioengineering 34 (1989), S. 1098-1103 
    Details
    ISSN: 0006-3592
    Keywords: Chemistry ; Biochemistry and Biotechnology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A new isolation and purification method for bioproducts using membrane-encapsulated affinity adsorbents was investigated. The new method involves encapsulation of affinity adsorbents, batch adsorption of the bioproduct from whole fermentation broth and rapid batch desorption after dissolution of the capsule membranes. Recovery of protein A from Staphylococcus aureus was used as the model experimental system. Affinity adsorbents such as rabbit IgG-agarose were successfully encapsulated within calcium alginate membranes and used directly to recover protein A from whole cell homogenate containing a number of macromolecular contaminants as well as suspended solids. Both high yield and high purity of protein A were recovered by this method in comparison with various previously reported methods.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bit.260340811
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  • 6
    Electronic Resource
    Electronic Resource
    Long-term culture of primary rat hepatocytes with high albumin secretion using membrane-supported collagen sandwich (1993)
    Springer
    Cytotechnology 11 (1993), S. 213-218 
    Details
    ISSN: 1573-0778
    Keywords: collagen ; extracellular matrix ; hepatocytes ; primary culture
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract Primary cultured rat hepatocytes in a membrane-supported collagen sandwich maintained their normal cell morphology and high level of albumin secretion for over 56 days. It was found that the existence of an upper layer of collagen gel is crucial for long-term culture and that the transference of cellular nutrients between the culture media and hepatocytes from both the upper and the lower sides of gel layers promotes albumin secretion. These facts suggest that the membrane-supported collagen sandwich mimics well thein vivo environment of hepatocytes. This method has great potential for the long-term culture of primary cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00749872
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  • 7
    Electronic Resource
    Electronic Resource
    Quantitative comparison of rat hepatocyte functions in two improved culture systems with or without rat liver epithelial cell line (1996)
    Springer
    Cytotechnology 21 (1996), S. 243-252 
    Details
    ISSN: 1573-0778
    Keywords: rat hepatocyte ; spheroid ; membrane-supported collagen sandwich ; rat liver epithelial cell ; albumin secretion ; 7-ethoxycoumarin reduction ; 7-hydroxycoumarin formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We quantitatively evaluated two recently-developed novel techniques for hepatocyte cultivation in a dish level; that is, spheroid culture and membrane-supported collagen (CN) gel sandwich culture, in terms of cellular maintenance, albumin secretion and 7-ethoxycoumarin (7EC) metabolism to 7-hydroxycoumarin (7HC) as a marker for cytochrome P450 IA1 activity in the presence and absence of rat liver epithelial cell line (RLEC) during one month of culture, together with conventional coculture with RLEC in CN-coated dishes as a control. RLEC prevented spheroid loss caused by its detachment from the culture dishes often occurring in pure culture. CN-gel sandwich by itself improved remarkably hepatocyte maintenance when compared with CN-gel free systems, thereby resulting in enhancement of overall functional expressions as compared with CN-gel free systems. RLEC in CN-gel sandwhich, however, reduced cellular sustainment probably due to its suppression of hepatocyte growth. Although there were no significant differences in albumin secretion per cell among the five cultures examined, CN-gel sandwich expressed markedly higher 7EC metabolizing activity per cell, where RLEC presence had a preferable influence. Consequently, membrane-supported CN-gel sandwich was the most superior technique for hepatocyte cultivation from the standpont of both cellular maintenance and its functional expressions per cell.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00365347
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  • 8
    Electronic Resource
    Electronic Resource
    Preservation of microplate-attached human hepatoma cells and their use in cytotoxicity tests (2000)
    Springer
    Cytotechnology 32 (2000), S. 147-155 
    Details
    ISSN: 1573-0778
    Keywords: cell attachment ; cell matrix proteins ; cytotoxicity test ; cryopreservation ; growth recovery ; human hepatoma cell
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Abstract We investigated the feasibility of hypothermic- orcryogenically-preserved human hepatoma Hep G2 cell preculturedin 96-well plates in cytotoxicity testings. First, we observedthat microplates precoated with both collagen (CN) and pronectin (PN) showed significantly improved living cell adhesion (71.0 ± 5.5%) after 48 hr of cryopreservation with 10%-DMSO containing culture medium, whereas non-coated surfaces gave very low living cell adhesion (33.5 ± 2.1%). Hypothermic preservation was most suitable for short-term storage, and cryogenic preservation at –20 °C allowed cells to be used within a week of the storage period. Only cryopreservation in a deep freezer (–85 °C) gave satisfactory results in much longer period of storage. Second, we evaluated the cytotoxicity of ten chemicals during 48 hr of exposure using hypothermically – (4 °C for 2 days) or cryogenically – (–85 °C for 7 days) preserved cells cultured inCN/PN-precoated microplates in comparison with results fromfreshly inoculated cells. Although almost the same LD50values were obtained, LD10 values of relatively hydrophilic chemicals obtained with cryopreserved cell were significantly lowered. These results shown that CN/PN-precoating is effective in keeping cells attached even in recultivation of preserved cells and that the toxicities of relatively hydrophilic chemicals tend to be overestimated when we use preserved cells in that manner.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008124228377
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  • 9
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    Trihalomethane adsorption on activated carbon fibers (1991)
    Elsevier
    Details
    Publication Date: 1991-02-01
    Print ISSN: 0043-1354
    Electronic ISSN: 1879-2448
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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  • 10
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    A predictive model of long-term stability after biomanipulation of shallow lakes (2000)
    Elsevier
    Details
    Publication Date: 2000-11-01
    Print ISSN: 0043-1354
    Electronic ISSN: 1879-2448
    Topics: Energy, Environment Protection, Nuclear Power Engineering
    Published by Elsevier
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