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  • 1
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    BRCA1 inhibition of estrogen receptor signaling in transfected cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Mutations of the breast cancer susceptibility gene BRCA1 confer increased risk for breast, ovarian, and prostatic cancers, but it is not clear why the mutations are associated with these particular tumor types. In transient transfection assays, BRCA1 was found to inhibit signaling by the ligand-activated estrogen receptor (ER-alpha) through the estrogen-responsive enhancer element and to block the transcriptional activation function AF-2 of ER-alpha. These results raise the possibility that wild-type BRCA1 suppresses estrogen-dependent transcriptional pathways related to mammary epithelial cell proliferation and that loss of this ability contributes to tumorigenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fan, S -- Wang, J -- Yuan, R -- Ma, Y -- Meng, Q -- Erdos, M R -- Pestell, R G -- Yuan, F -- Auborn, K J -- Goldberg, I D -- Rosen, E M -- R01-CA75503/CA/NCI NIH HHS/ -- R01-ES09169/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1999 May 21;284(5418):1354-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Radiation Oncology, Long Island Jewish Medical Center, The Long Island Campus for the Albert Einstein College of Medicine, 270-05 76th Avenue, New Hyde Park, NY 11040, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334989" target="_blank"〉PubMed〈/a〉
    Keywords: BRCA1 Protein/*physiology ; Breast/cytology ; Breast Neoplasms/etiology ; Cell Division ; Enhancer Elements, Genetic ; Epithelial Cells/cytology ; Estradiol/metabolism ; Estrogen Receptor alpha ; Female ; Genes, BRCA1 ; Genes, Reporter ; Humans ; Ligands ; Male ; Receptors, Estrogen/*metabolism ; *Signal Transduction ; Transcription Factors/metabolism ; *Transcriptional Activation ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Neurodegeneration prevented by lentiviral vector delivery of GDNF in primate models of Parkinson's disease (2000)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2000-10-29
    Description: Lentiviral delivery of glial cell line-derived neurotrophic factor (lenti-GDNF) was tested for its trophic effects upon degenerating nigrostriatal neurons in nonhuman primate models of Parkinson's disease (PD). We injected lenti-GDNF into the striatum and substantia nigra of nonlesioned aged rhesus monkeys or young adult rhesus monkeys treated 1 week prior with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). Extensive GDNF expression with anterograde and retrograde transport was seen in all animals. In aged monkeys, lenti-GDNF augmented dopaminergic function. In MPTP-treated monkeys, lenti-GDNF reversed functional deficits and completely prevented nigrostriatal degeneration. Additionally, lenti-GDNF injections to intact rhesus monkeys revealed long-term gene expression (8 months). In MPTP-treated monkeys, lenti-GDNF treatment reversed motor deficits in a hand-reach task. These data indicate that GDNF delivery using a lentiviral vector system can prevent nigrostriatal degeneration and induce regeneration in primate models of PD and might be a viable therapeutic strategy for PD patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kordower, J H -- Emborg, M E -- Bloch, J -- Ma, S Y -- Chu, Y -- Leventhal, L -- McBride, J -- Chen, E Y -- Palfi, S -- Roitberg, B Z -- Brown, W D -- Holden, J E -- Pyzalski, R -- Taylor, M D -- Carvey, P -- Ling, Z -- Trono, D -- Hantraye, P -- Deglon, N -- Aebischer, P -- NS40578/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):767-73.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurological Sciences, Rush Presbyterian-St. Luke's Medical Center, Chicago, IL 60612, USA. jkordowe@rush.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11052933" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine ; Aging ; Animals ; Antigens, CD/analysis ; Dihydroxyphenylalanine/*analogs & derivatives/metabolism ; Disease Models, Animal ; Dopamine/*metabolism ; Female ; Gene Expression ; *Genetic Therapy ; Genetic Vectors ; Glial Cell Line-Derived Neurotrophic Factor ; Lentivirus/genetics ; Macaca mulatta ; Neostriatum/metabolism/pathology ; Nerve Degeneration/*prevention & control ; *Nerve Growth Factors ; Nerve Tissue Proteins/*genetics/metabolism/therapeutic use ; Neurons/enzymology ; Parkinson Disease/metabolism/pathology/physiopathology/*therapy ; Parkinsonian Disorders/metabolism/pathology/physiopathology/therapy ; Psychomotor Performance ; Substantia Nigra/metabolism/pathology ; Tyrosine 3-Monooxygenase/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    The changing face of HIV in China (2008)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2008-10-04
    Description: HIV has advanced from high-risk groups such as intravenous drug users to some in the general population, according to comprehensive new data from the south of China. What needs to be done to halt its spread?〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lu, Lin -- Jia, Manhong -- Ma, Yanling -- Yang, Li -- Chen, Zhiwei -- Ho, David D -- Jiang, Yan -- Zhang, Linqi -- England -- Nature. 2008 Oct 2;455(7213):609-11. doi: 10.1038/455609a.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Yunnan Center for Disease Control and Prevention, Yunnan, People's Republic of China.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18833270" target="_blank"〉PubMed〈/a〉
    Keywords: Adolescent ; Adult ; China/epidemiology ; Ethnic Groups/statistics & numerical data ; Female ; HIV Infections/*epidemiology/prevention & control/transmission/virology ; HIV-1/genetics ; Humans ; Male ; Pregnancy ; Prevalence ; Prostitution/statistics & numerical data ; Sentinel Surveillance ; Sex Ratio ; Substance Abuse, Intravenous/epidemiology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 4
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    RAF inhibitors that evade paradoxical MAPK pathway activation (2015)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2015-10-16
    Description: Oncogenic activation of BRAF fuels cancer growth by constitutively promoting RAS-independent mitogen-activated protein kinase (MAPK) pathway signalling. Accordingly, RAF inhibitors have brought substantially improved personalized treatment of metastatic melanoma. However, these targeted agents have also revealed an unexpected consequence: stimulated growth of certain cancers. Structurally diverse ATP-competitive RAF inhibitors can either inhibit or paradoxically activate the MAPK pathway, depending whether activation is by BRAF mutation or by an upstream event, such as RAS mutation or receptor tyrosine kinase activation. Here we have identified next-generation RAF inhibitors (dubbed 'paradox breakers') that suppress mutant BRAF cells without activating the MAPK pathway in cells bearing upstream activation. In cells that express the same HRAS mutation prevalent in squamous tumours from patients treated with RAF inhibitors, the first-generation RAF inhibitor vemurafenib stimulated in vitro and in vivo growth and induced expression of MAPK pathway response genes; by contrast the paradox breakers PLX7904 and PLX8394 had no effect. Paradox breakers also overcame several known mechanisms of resistance to first-generation RAF inhibitors. Dissociating MAPK pathway inhibition from paradoxical activation might yield both improved safety and more durable efficacy than first-generation RAF inhibitors, a concept currently undergoing human clinical evaluation with PLX8394.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhang, Chao -- Spevak, Wayne -- Zhang, Ying -- Burton, Elizabeth A -- Ma, Yan -- Habets, Gaston -- Zhang, Jiazhong -- Lin, Jack -- Ewing, Todd -- Matusow, Bernice -- Tsang, Garson -- Marimuthu, Adhirai -- Cho, Hanna -- Wu, Guoxian -- Wang, Weiru -- Fong, Daniel -- Nguyen, Hoa -- Shi, Songyuan -- Womack, Patrick -- Nespi, Marika -- Shellooe, Rafe -- Carias, Heidi -- Powell, Ben -- Light, Emily -- Sanftner, Laura -- Walters, Jason -- Tsai, James -- West, Brian L -- Visor, Gary -- Rezaei, Hamid -- Lin, Paul S -- Nolop, Keith -- Ibrahim, Prabha N -- Hirth, Peter -- Bollag, Gideon -- England -- Nature. 2015 Oct 22;526(7574):583-6. doi: 10.1038/nature14982. Epub 2015 Oct 14.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Plexxikon Inc., 91 Bolivar Drive, Berkeley, California 94710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26466569" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line, Tumor ; Enzyme Activation/drug effects ; Female ; Genes, ras/genetics ; Heterocyclic Compounds, 2-Ring/adverse effects/pharmacology ; Humans ; Indoles/adverse effects/pharmacology ; MAP Kinase Signaling System/*drug effects/genetics ; Mice ; Mitogen-Activated Protein Kinases/*metabolism ; Models, Biological ; Mutation/genetics ; Protein Kinase Inhibitors/adverse effects/*pharmacology ; Proto-Oncogene Proteins B-raf/*antagonists & inhibitors/genetics ; Sulfonamides/adverse effects/pharmacology
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 5
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    Chemotherapy-induced antitumor immunity requires formyl peptide receptor 1 (2015)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2015-10-31
    Description: Antitumor immunity driven by intratumoral dendritic cells contributes to the efficacy of anthracycline-based chemotherapy in cancer. We identified a loss-of-function allele of the gene coding for formyl peptide receptor 1 (FPR1) that was associated with poor metastasis-free and overall survival in breast and colorectal cancer patients receiving adjuvant chemotherapy. The therapeutic effects of anthracyclines were abrogated in tumor-bearing Fpr1(-/-) mice due to impaired antitumor immunity. Fpr1-deficient dendritic cells failed to approach dying cancer cells and, as a result, could not elicit antitumor T cell immunity. Experiments performed in a microfluidic device confirmed that FPR1 and its ligand, annexin-1, promoted stable interactions between dying cancer cells and human or murine leukocytes. Altogether, these results highlight the importance of FPR1 in chemotherapy-induced anticancer immune responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vacchelli, Erika -- Ma, Yuting -- Baracco, Elisa E -- Sistigu, Antonella -- Enot, David P -- Pietrocola, Federico -- Yang, Heng -- Adjemian, Sandy -- Chaba, Kariman -- Semeraro, Michaela -- Signore, Michele -- De Ninno, Adele -- Lucarini, Valeria -- Peschiaroli, Francesca -- Businaro, Luca -- Gerardino, Annamaria -- Manic, Gwenola -- Ulas, Thomas -- Gunther, Patrick -- Schultze, Joachim L -- Kepp, Oliver -- Stoll, Gautier -- Lefebvre, Celine -- Mulot, Claire -- Castoldi, Francesca -- Rusakiewicz, Sylvie -- Ladoire, Sylvain -- Apetoh, Lionel -- Bravo-San Pedro, Jose Manuel -- Lucattelli, Monica -- Delarasse, Cecile -- Boige, Valerie -- Ducreux, Michel -- Delaloge, Suzette -- Borg, Christophe -- Andre, Fabrice -- Schiavoni, Giovanna -- Vitale, Ilio -- Laurent-Puig, Pierre -- Mattei, Fabrizio -- Zitvogel, Laurence -- Kroemer, Guido -- New York, N.Y. -- Science. 2015 Nov 20;350(6263):972-8. doi: 10.1126/science.aad0779. Epub 2015 Oct 29.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. Universite Pierre et Marie Curie, Paris, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. Universite Pierre et Marie Curie, Paris, France. Suzhou Institute of Systems Medicine, Suzhou, Jiangsu, China. Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Faculte de Medecine, Universite Paris-Saclay, Kremlin-Bicetre, France. ; Regina Elena National Cancer Institute, Rome, Italy. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1015, Villejuif, France. Center of Clinical Investigations in Biotherapies of Cancer (CICBT) 507, Villejuif, France. ; Department of Hematology, Oncology, and Molecular Medicine, Istituto Superiore di Sanita, Rome, Italy. ; Italian National Research Council, Institute for Photonics and Nanotechnology, Rome, Italy. ; Genomics and Immunoregulation, Life and Medical Science Center Institute, University of Bonn, Germany. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U981, Villejuif, France. ; Universite Paris Sorbonne Cite, UMRS 775, INSERM, Paris, France. INSERM U1147, Centre de Ressources Biologiques (CRB) EPIGENETIC, Paris, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Faculte de Medecine, Universite Paris-Saclay, Kremlin-Bicetre, France. Sotio, Prague, Czech Republic. ; Department of Medical Oncology, Centre Georges-Francois Leclerc, Dijon, France. Universite Bourgogne Franche-Comte, Dijon, France. Centre Georges Francois Leclerc, Dijon, France. ; Department of Life Sciences, University of Siena, Siena, Italy. ; Institut du Cerveau et de la Moelle Epiniere, ICM CNRS UMR 7225 - INSERM U 1127 - UPMC-P6 UMR S 1127, Equipe Neurogenetique et Physiologie Hopital de la Pitie-Salpetriere, 47, Boulevard de l'Hopital, 75013 Paris, France. ; INSERM U1147, Centre de Ressources Biologiques (CRB) EPIGENETIC, Paris, France. Department of Medical Oncology, Gustave Roussy Cancer Campus, Villejuif Cedex, France. ; Faculte de Medecine, Universite Paris-Saclay, Kremlin-Bicetre, France. Department of Medical Oncology, Gustave Roussy Cancer Campus, Villejuif Cedex, France. ; INSERM, U981, Villejuif, France. Department of Breast Oncology, Gustave Roussy Cancer Campus, Villejuif, France. ; University of Franche-Comte, INSERM 1098, France. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U981, Villejuif, France. Department of Biology and Pathology, Gustave Roussy Cancer Campus, Villejuif, France. Department of Medical Oncology, Gustave Roussy Cancer Campus, Villejuif, France. ; Regina Elena National Cancer Institute, Rome, Italy. Department of Biology, University of Rome "Tor Vergata," Rome, Italy. ; Universite Paris Sorbonne Cite, UMRS 775, INSERM, Paris, France. INSERM U1147, Centre de Ressources Biologiques (CRB) EPIGENETIC, Paris, France. Pole de Biologie, Hopital Europeen Georges Pompidou, AP-HP, Paris, France. ; Gustave Roussy Cancer Campus, Villejuif, France. Faculte de Medecine, Universite Paris-Saclay, Kremlin-Bicetre, France. INSERM, U1015, Villejuif, France. Center of Clinical Investigations in Biotherapies of Cancer (CICBT) 507, Villejuif, France. kroemer@orange.fr laurence.zitvogel@gustaveroussy.fr. ; Gustave Roussy Cancer Campus, Villejuif, France. INSERM, U1138, Paris, France. Equipe 11 Labellisee par la Ligue Nationale Contre le Cancer, Centre de Recherche des Cordeliers, Paris, France. Universite Paris Descartes, Sorbonne Paris Cite, Paris, France. Universite Pierre et Marie Curie, Paris, France. Metabolomics and Cell Biology Platforms, Gustave Roussy Cancer Campus, Villejuif, France. Pole de Biologie, Hopital Europeen Georges Pompidou, AP-HP, Paris, France. Karolinska Institute, Department of Women's and Children's Health, Karolinska University Hospital, 17176 Stockholm, Sweden. kroemer@orange.fr laurence.zitvogel@gustaveroussy.fr.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26516201" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Animals ; Annexin A1/metabolism/pharmacology ; Anthracyclines/*therapeutic use ; Breast Neoplasms/drug therapy/immunology ; Cell Line, Tumor ; Chemotherapy, Adjuvant ; Colorectal Neoplasms/drug therapy/immunology ; Dendritic Cells/drug effects/immunology ; Female ; Humans ; Immunity, Innate/genetics ; Leukocytes/drug effects/immunology ; Mice ; Neoplasms/*drug therapy/*immunology ; Polymorphism, Single Nucleotide ; Receptors, Formyl Peptide/genetics/*physiology ; T-Lymphocytes/immunology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 6
    Electronic Resource
    Electronic Resource
    On the computation of complex equilibria (1972)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 18 (1972), S. 299-304 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A method is described for solving the problem: given fixed pressure, temperature, the amounts of the chemical elements, and the chemical potentials of possible chemical species at the pressure and temperature specified, determine the equilibrium composition. The method requires a minimum of judgment on the part of the user.A modification of Naphtali's method for direct minimization of Gibbs' function provides an estimate of the composition of sufficient accuracy to insure convergence of solution, by the Newton-Raphson method, of the nonlinear equations describing the equilibrium.Problems in treating multiple phaes of unknown stability and chemical species present in small amouts are handled by ignoring unstable phases and small quantitites in the direct minimization until the amounts of the major consitituents have been at least approximately determined. To accomplish this, species temporarily ignored are assigned a ficitious mol fraction so that their re-entry into the calculation can be established. Truncation errors in the direct minimziation can be tolerated because of the two-step method.Examples of some of the problems solved are given.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690180209
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  • 7
    Electronic Resource
    Electronic Resource
    Multicomponent rates of sorption of SO2 and CO2 in sodium mordenite (1973)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 19 (1973), S. 1055-1059 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690190531
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  • 8
    Electronic Resource
    Electronic Resource
    Transient diffusion in solids with a bipore distribution (1976)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 22 (1976), S. 147-152 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Transient diffusion of n-butane, iso-butane, and 1-butene in synthetic CaX(Na) spherical pellets is studied in a constant volume, well-stirred system. The intracrystalline diffusion coefficients are in the order of 10-14 cm2/s, and the activation energy is about 7.0 Kcal/g-mole. Experimental data agree well with a mathematical model developed to describe transient diffusion.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690220118
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  • 9
    Electronic Resource
    Electronic Resource
    Analysis of liquid chromatography with nonuniform crystallite particles (1990)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 1569-1576 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: A mathematical analysis for the pulse responses of a liquid chromatographic column packed with crystal powders having a particle size distribution and a nonlinear adsorption isotherm is presented. The mathematical model is solved numerically by the orthogonal collocation method. Based on the parametric analysis of the model, the effects of a symmetrical and moderately asymmetric PSD on the LC responses are shown to be negligible in comparison with the effects of other parameters, such as isotherm nonlinearity, whose effects are much more profound. The simulated responses are compared with the experimental response data for an LC column packed with silicalite crystals, and a good agreement is found between the theoretical and experimental results. Using the nonlinear LC model, the simultaneous determination of nonlinear adsorption isotherms and intraparticle diffusivities from LC pulse responses is demonstrated for liquids in porous adsorbents.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690361013
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  • 10
    Electronic Resource
    Electronic Resource
    Theory of gas diffusion and permeation in inorganic molecular-sieve membranes (1995)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 41 (1995), S. 58-67 
    Details
    ISSN: 0001-1541
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Notes: Theoretical models of gas diffusion and permeation in microporous molecularsieve membranes are presented. The effect of the adsorbed diffusant on the total transmembrane flow is insignificant for permanent gases. For highly adsorbable gases the effect of the adsorbed molecules on the total transmembrane flux may be high at low temperatures. The activation energy of diffusion increases when the kinetic diameter of the diffusant increases. The activation energy of gas diffusion compares well with the values calculated based on the Lennard-Jones potential. Maximum possible permeability coefficients calculated for He in the molecular-sieve membranes do not exceed ˜30,000 Barrer at room temperature. The experimentally observed value for He permeability is ˜1,000 Barrer (T=30°C) because of the high tortuosity (τ≍ 25) and low porosity (θ = 0.22) of the membrane porous structure.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690410107
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