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  • Humans  (73)
  • Chemistry  (64)
  • Life and Medical Sciences
  • 2010-2014  (30)
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  • 1990-1994  (97)
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  • 1
    Electronic Resource
    Electronic Resource
    Microwave thawing of cylinders (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 1789-1800 
    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: The finite element method was used to model microwave thawing of pure-water and 0.1-M NaCl cylinders. The electromagnetic field was described by Maxwell's equations with temperature-dependent dielectric properties, while the heat equation, coupled with the Stefan and Robin conditions, was used to describe the thawing process. An additional equation for the frozen volume fraction was used, when necessary, to account for the presence of a mushy region. Two microwave frequencies, 915 MHz and 2,450 MHz, were examined and the microwave radiation was assumed to be radially isotropic and normal to the surface of the cylinder. Results show that a two-phase mushy region may exist, and an additional thawing front may appear at the center of the cylinder. Salt cylinders have a higher dielectric loss than pure-water cylinders and therefore thaw more quickly. Internal resonance occurs when the wavelength of the radiation is a harmonic of the cylinder radius. Resonance increases power deposition and expedites the thawing process. The onset of resonance alters thawing times and complicates the development of heuristic rules for microwave thawing.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690371204
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of sample size on the microwave heating rate: Oil vs. water (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 1433-1439 
    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: It is generally believed that oil samples heat faster in a microwave oven than do water samples of the same mass. For sufficiently large and thich samples this conventional wisdom is indeed correct, but this trend can be far from true in smaller samples. In a commercially-made home microwave oven, we observed that with decreasing sample size the heating rate of a water sample increases much faster than that of an oil sample. At 50 g the heating rate of a water sample is several times greater than that of an oil sample. Additionally, in studies of cylindrical samples in a customized oven having a unidirectional microwave source, the heating rate of water samples smaller than 2.4 cm in radius is greater than that of oil samples and is a strongly oscillatory increasing function of decreasing sample radius. Combining Maxwell's theory of microwave penetration and the heat conduction equation, we show that this previously unreported oscillatory heating behavior results from the added power absorbed by samples due to resonant absorption of microwaves. The added power arises from standing waves produced by internally reflected microwaves. This effect is small for oil because only 3% of the microwave power is reflected at an oil-air interface. On the other hand, 64% is reflected at a water-air interface, which causes strong resonant heating. Our findings might prove to be useful for future consumer food product development or oven design.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400902
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  • 3
    Electronic Resource
    Electronic Resource
    Analysis of microwave heating of materials with temperature-dependent properties (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 313-322 
    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 temperature profiles in multilayer slabs are predicted, by simultaneously solving Maxwell's equations with the heat conduction equation, using Galerkin finite elements. It is assumed that the medium is homogeneous and has temperature-dependent dielectric and thermal properties. The method is illustrated with applications involving the heating of food and polymers with microwaves. The temperature dependence of dielectric properties affects the heating appreciably, as is shown by comparison with a constant property model.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370302
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  • 4
    Electronic Resource
    Electronic Resource
    Two-dimensional finite element analysis of microwave heating (1992)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 1577-1592 
    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 temperature profiles for long rods of lossy dielectric materials with thermally-dependent dielectric properties exposed to uniform plane waves are obtained. Maxwell's equation and the heat equation are simultaneously solved using the finite element method to predict the power absorbed and the resulting temperature rise in samples of square and circular cross-section. Following the method introduced recently, we derive an exact radiation boundary condition which is independent of the rod cross-section. For a cylindrical sample, the boundary condition is imposed on the cylinder itself. For a square rod, the boundary condition is imposed on a cylinder containing the rod. The temperature dependence of dielectric properties and sample dimensions appreciably influence heating patterns. For square samples, the edges focus radiation, causing preferential heating at the edges. This effect is pronounced for larger samples. In addition, the incident wave polarization influences the heating of the rod. For waves where the electric field is polarized along the long axis of the sample (TMz polarization) the power absorbed is higher than when the electric field is perpendicular to the axis (TEz polarization). A case involving runaway heating is also investigated.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690381009
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  • 5
    Electronic Resource
    Electronic Resource
    Microwave driven convection in a square cavity (1994)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 40 (1994), S. 1268-1272 
    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: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690400718
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  • 6
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    The major genetic determinants of HIV-1 control affect HLA class I peptide presentation (2010)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2010-11-06
    Description: Infectious and inflammatory diseases have repeatedly shown strong genetic associations within the major histocompatibility complex (MHC); however, the basis for these associations remains elusive. To define host genetic effects on the outcome of a chronic viral infection, we performed genome-wide association analysis in a multiethnic cohort of HIV-1 controllers and progressors, and we analyzed the effects of individual amino acids within the classical human leukocyte antigen (HLA) proteins. We identified 〉300 genome-wide significant single-nucleotide polymorphisms (SNPs) within the MHC and none elsewhere. Specific amino acids in the HLA-B peptide binding groove, as well as an independent HLA-C effect, explain the SNP associations and reconcile both protective and risk HLA alleles. These results implicate the nature of the HLA-viral peptide interaction as the major factor modulating durable control of HIV infection.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3235490/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3235490/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉International HIV Controllers Study -- Pereyra, Florencia -- Jia, Xiaoming -- McLaren, Paul J -- Telenti, Amalio -- de Bakker, Paul I W -- Walker, Bruce D -- Ripke, Stephan -- Brumme, Chanson J -- Pulit, Sara L -- Carrington, Mary -- Kadie, Carl M -- Carlson, Jonathan M -- Heckerman, David -- Graham, Robert R -- Plenge, Robert M -- Deeks, Steven G -- Gianniny, Lauren -- Crawford, Gabriel -- Sullivan, Jordan -- Gonzalez, Elena -- Davies, Leela -- Camargo, Amy -- Moore, Jamie M -- Beattie, Nicole -- Gupta, Supriya -- Crenshaw, Andrew -- Burtt, Noel P -- Guiducci, Candace -- Gupta, Namrata -- Gao, Xiaojiang -- Qi, Ying -- Yuki, Yuko -- Piechocka-Trocha, Alicja -- Cutrell, Emily -- Rosenberg, Rachel -- Moss, Kristin L -- Lemay, Paul -- O'Leary, Jessica -- Schaefer, Todd -- Verma, Pranshu -- Toth, Ildiko -- Block, Brian -- Baker, Brett -- Rothchild, Alissa -- Lian, Jeffrey -- Proudfoot, Jacqueline -- Alvino, Donna Marie L -- Vine, Seanna -- Addo, Marylyn M -- Allen, Todd M -- Altfeld, Marcus -- Henn, Matthew R -- Le Gall, Sylvie -- Streeck, Hendrik -- Haas, David W -- Kuritzkes, Daniel R -- Robbins, Gregory K -- Shafer, Robert W -- Gulick, Roy M -- Shikuma, Cecilia M -- Haubrich, Richard -- Riddler, Sharon -- Sax, Paul E -- Daar, Eric S -- Ribaudo, Heather J -- Agan, Brian -- Agarwal, Shanu -- Ahern, Richard L -- Allen, Brady L -- Altidor, Sherly -- Altschuler, Eric L -- Ambardar, Sujata -- Anastos, Kathryn -- Anderson, Ben -- Anderson, Val -- Andrady, Ushan -- Antoniskis, Diana -- Bangsberg, David -- Barbaro, Daniel -- Barrie, William -- Bartczak, J -- Barton, Simon -- Basden, Patricia -- Basgoz, Nesli -- Bazner, Suzane -- Bellos, Nicholaos C -- Benson, Anne M -- Berger, Judith -- Bernard, Nicole F -- Bernard, Annette M -- Birch, Christopher -- Bodner, Stanley J -- Bolan, Robert K -- Boudreaux, Emilie T -- Bradley, Meg -- Braun, James F -- Brndjar, Jon E -- Brown, Stephen J -- Brown, Katherine -- Brown, Sheldon T -- Burack, Jedidiah -- Bush, Larry M -- Cafaro, Virginia -- Campbell, Omobolaji -- Campbell, John -- Carlson, Robert H -- Carmichael, J Kevin -- Casey, Kathleen K -- Cavacuiti, Chris -- Celestin, Gregory -- Chambers, Steven T -- Chez, Nancy -- Chirch, Lisa M -- Cimoch, Paul J -- Cohen, Daniel -- Cohn, Lillian E -- Conway, Brian -- Cooper, David A -- Cornelson, Brian -- Cox, David T -- Cristofano, Michael V -- Cuchural, George Jr -- Czartoski, Julie L -- Dahman, Joseph M -- Daly, Jennifer S -- Davis, Benjamin T -- Davis, Kristine -- Davod, Sheila M -- DeJesus, Edwin -- Dietz, Craig A -- Dunham, Eleanor -- Dunn, Michael E -- Ellerin, Todd B -- Eron, Joseph J -- Fangman, John J W -- Farel, Claire E -- Ferlazzo, Helen -- Fidler, Sarah -- Fleenor-Ford, Anita -- Frankel, Renee -- Freedberg, Kenneth A -- French, Neel K -- Fuchs, Jonathan D -- Fuller, Jon D -- Gaberman, Jonna -- Gallant, Joel E -- Gandhi, Rajesh T -- Garcia, Efrain -- Garmon, Donald -- Gathe, Joseph C Jr -- Gaultier, Cyril R -- Gebre, Wondwoosen -- Gilman, Frank D -- Gilson, Ian -- Goepfert, Paul A -- Gottlieb, Michael S -- Goulston, Claudia -- Groger, Richard K -- Gurley, T Douglas -- Haber, Stuart -- Hardwicke, Robin -- Hardy, W David -- Harrigan, P Richard -- Hawkins, Trevor N -- Heath, Sonya -- Hecht, Frederick M -- Henry, W Keith -- Hladek, Melissa -- Hoffman, Robert P -- Horton, James M -- Hsu, Ricky K -- Huhn, Gregory D -- Hunt, Peter -- Hupert, Mark J -- Illeman, Mark L -- Jaeger, Hans -- Jellinger, Robert M -- John, Mina -- Johnson, Jennifer A -- Johnson, Kristin L -- Johnson, Heather -- Johnson, Kay -- Joly, Jennifer -- Jordan, Wilbert C -- Kauffman, Carol A -- Khanlou, Homayoon -- Killian, Robert K -- Kim, Arthur Y -- Kim, David D -- Kinder, Clifford A -- Kirchner, Jeffrey T -- Kogelman, Laura -- Kojic, Erna Milunka -- Korthuis, P Todd -- Kurisu, Wayne -- Kwon, Douglas S -- LaMar, Melissa -- Lampiris, Harry -- Lanzafame, Massimiliano -- Lederman, Michael M -- Lee, David M -- Lee, Jean M L -- Lee, Marah J -- Lee, Edward T Y -- Lemoine, Janice -- Levy, Jay A -- Llibre, Josep M -- Liguori, Michael A -- Little, Susan J -- Liu, Anne Y -- Lopez, Alvaro J -- Loutfy, Mono R -- Loy, Dawn -- Mohammed, Debbie Y -- Man, Alan -- Mansour, Michael K -- Marconi, Vincent C -- Markowitz, Martin -- Marques, Rui -- Martin, Jeffrey N -- Martin, Harold L Jr -- Mayer, Kenneth Hugh -- McElrath, M Juliana -- McGhee, Theresa A -- McGovern, Barbara H -- McGowan, Katherine -- McIntyre, Dawn -- Mcleod, Gavin X -- Menezes, Prema -- Mesa, Greg -- Metroka, Craig E -- Meyer-Olson, Dirk -- Miller, Andy O -- Montgomery, Kate -- Mounzer, Karam C -- Nagami, Ellen H -- Nagin, Iris -- Nahass, Ronald G -- Nelson, Margret O -- Nielsen, Craig -- Norene, David L -- O'Connor, David H -- Ojikutu, Bisola O -- Okulicz, Jason -- Oladehin, Olakunle O -- Oldfield, Edward C 3rd -- Olender, Susan A -- Ostrowski, Mario -- Owen, William F Jr -- Pae, Eunice -- Parsonnet, Jeffrey -- Pavlatos, Andrew M -- Perlmutter, Aaron M -- Pierce, Michael N -- Pincus, Jonathan M -- Pisani, Leandro -- Price, Lawrence Jay -- Proia, Laurie -- Prokesch, Richard C -- Pujet, Heather Calderon -- Ramgopal, Moti -- Rathod, Almas -- Rausch, Michael -- Ravishankar, J -- Rhame, Frank S -- Richards, Constance Shamuyarira -- Richman, Douglas D -- Rodes, Berta -- Rodriguez, Milagros -- Rose, Richard C 3rd -- Rosenberg, Eric S -- Rosenthal, Daniel -- Ross, Polly E -- Rubin, David S -- Rumbaugh, Elease -- Saenz, Luis -- Salvaggio, Michelle R -- Sanchez, William C -- Sanjana, Veeraf M -- Santiago, Steven -- Schmidt, Wolfgang -- Schuitemaker, Hanneke -- Sestak, Philip M -- Shalit, Peter -- Shay, William -- Shirvani, Vivian N -- Silebi, Vanessa I -- Sizemore, James M Jr -- Skolnik, Paul R -- Sokol-Anderson, Marcia -- Sosman, James M -- Stabile, Paul -- Stapleton, Jack T -- Starrett, Sheree -- Stein, Francine -- Stellbrink, Hans-Jurgen -- Sterman, F Lisa -- Stone, Valerie E -- Stone, David R -- Tambussi, Giuseppe -- Taplitz, Randy A -- Tedaldi, Ellen M -- Theisen, William -- Torres, Richard -- Tosiello, Lorraine -- Tremblay, Cecile -- Tribble, Marc A -- Trinh, Phuong D -- Tsao, Alice -- Ueda, Peggy -- Vaccaro, Anthony -- Valadas, Emilia -- Vanig, Thanes J -- Vecino, Isabel -- Vega, Vilma M -- Veikley, Wenoah -- Wade, Barbara H -- Walworth, Charles -- Wanidworanun, Chingchai -- Ward, Douglas J -- Warner, Daniel A -- Weber, Robert D -- Webster, Duncan -- Weis, Steve -- Wheeler, David A -- White, David J -- Wilkins, Ed -- Winston, Alan -- Wlodaver, Clifford G -- van't Wout, Angelique -- Wright, David P -- Yang, Otto O -- Yurdin, David L -- Zabukovic, Brandon W -- Zachary, Kimon C -- Zeeman, Beth -- Zhao, Meng -- AI030914/AI/NIAID NIH HHS/ -- AI068636/AI/NIAID NIH HHS/ -- AI069415/AI/NIAID NIH HHS/ -- AI069419/AI/NIAID NIH HHS/ -- AI069423/AI/NIAID NIH HHS/ -- AI069424/AI/NIAID NIH HHS/ -- AI069428/AI/NIAID NIH HHS/ -- AI069432/AI/NIAID NIH HHS/ -- AI069434/AI/NIAID NIH HHS/ -- AI069450/AI/NIAID NIH HHS/ -- AI069452/AI/NIAID NIH HHS/ -- AI069465/AI/NIAID NIH HHS/ -- AI069471/AI/NIAID NIH HHS/ -- AI069472/AI/NIAID NIH HHS/ -- AI069474/AI/NIAID NIH HHS/ -- AI069477/AI/NIAID NIH HHS/ -- AI069484/AI/NIAID NIH HHS/ -- AI069495/AI/NIAID NIH HHS/ -- AI069501/AI/NIAID NIH HHS/ -- AI069502/AI/NIAID NIH HHS/ -- AI069511/AI/NIAID NIH HHS/ -- AI069513/AI/NIAID NIH HHS/ -- AI069532/AI/NIAID NIH HHS/ -- AI069556/AI/NIAID NIH HHS/ -- AI077505/AI/NIAID NIH HHS/ -- AI087145/AI/NIAID NIH HHS/ -- AI25859/AI/NIAID NIH HHS/ -- 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NIH HHS/ -- UM1 AI068634/AI/NIAID NIH HHS/ -- UM1 AI068634-06/AI/NIAID NIH HHS/ -- UM1 AI068634-07/AI/NIAID NIH HHS/ -- UM1 AI068636-06/AI/NIAID NIH HHS/ -- UM1 AI068636-07/AI/NIAID NIH HHS/ -- UM1 AI069477/AI/NIAID NIH HHS/ -- Howard Hughes Medical Institute/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2010 Dec 10;330(6010):1551-7. doi: 10.1126/science.1195271. Epub 2010 Nov 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ragon Institute of Massachusetts General Hospital, Massachusetts Institute of Technology (MIT) and Harvard, Boston, MA, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/21051598" target="_blank"〉PubMed〈/a〉
    Keywords: African Americans/genetics ; Alleles ; Amino Acids/physiology ; *Antigen Presentation ; CD8-Positive T-Lymphocytes/immunology ; Cohort Studies ; Disease Progression ; European Continental Ancestry Group/genetics ; *Genes, MHC Class I ; Genome-Wide Association Study ; HIV Antigens/immunology ; HIV Infections/ethnology/*genetics/*immunology/virology ; HIV Long-Term Survivors ; *HIV-1/immunology ; HLA-A Antigens/chemistry/genetics/immunology/metabolism ; HLA-B Antigens/chemistry/*genetics/immunology/metabolism ; HLA-C Antigens/chemistry/genetics/immunology/metabolism ; Haplotypes ; Hispanic Americans/genetics ; Humans ; Immunity, Innate ; Logistic Models ; Models, Molecular ; Polymorphism, Single Nucleotide ; Protein Conformation ; Viral Load
    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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  • 7
    Electronic Resource
    Electronic Resource
    Effect of crosslinker on properties of copolymeric N-vinyl-2-pyrrolidone/methyl methacrylate hydrogels and organogels (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 331-343 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: The γ-ray initiated copolymerisation of N-vinyl-2-pyrrolidone with methyl methacrylate in the presence of crosslinker has been effected to high conversion. At two fixed compositions of the principal monomers, the inclusion of different concentrations of the tetrafunctional crosslinkers ethylene dimethacrylate and a low molar mass poly(ethylene glycol) dimethacrylate produced crosslinked xerogels, which were subsequently swollen in water and 1,4-dioxane to yield hydrogels and organogels, respectively. These gels were characterised by determinations of sol fraction, equilibrium solvent content and uniaxial compression stress/strain measurements. Differences among the swelling and mechanical properties according to the nature and concentration of crosslinking agent and according to the nature of the swelling medium are noted and discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910207
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    Observations on the swelling behaviour of copolymeric hydrogels containing N-vinyl-2-pyrrolidone (1990)
    New York : Wiley-Blackwell
    Die Makromolekulare Chemie 191 (1990), S. 321-330 
    Details
    ISSN: 0025-116X
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: Polymer-water interaction parameters, sequence length distributions and contents of total, freezing and non-freezing water have been discussed for a family of hydrogels. The xerogel precursors contained N-vinyl-2-pyrrolidone (VP) with several co-monomers of different levels of hydrophobicity present in the xerogel over a wide range of composition. Common trends in the behaviour of these systems have been noted and rationalised. In particular the findings indicate that (i) in the poly-VP hydrogel ther are ca. 8-10 molecules of non-freezing water per VP unit and (ii) in the copolymeric hydrogels the maximum occurring in the variation of mole fraction of VP versus mole fraction of water is due substantially to the sharp increase in uptake of freezing (or bulk) water by copolymers rich in VP.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/macp.1990.021910206
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    Morphology and division in Spirodinium equi Fiorentini (protozoa, ciliata)A part of a thesis submitted to the Faculty of the Graduate School of Harvard University in partial fulfillment of the requirements for the degree of Doctor of Philosophy, in the Division of Biology. (1941)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 69 (1941), S. 225-261 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050690204
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    Epitope mapping of monoclonal antibodies against caldesmon and their effects on the binding of caldesmon to Ca++/calmodulin and to actin or actin-tropomyosin filaments (1991)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 20 (1991), S. 95-108 
    Details
    ISSN: 0886-1544
    Keywords: actomyosin ; smooth muscle contraction ; nonmuscle cell motility ; microinjection ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The effects of monoclonal anti-caldesmon antibodies, C2, C9, C18, C21, and C23, on the binding of caldesmon to F-actin/F-actin-tropomyosin filaments and to Ca++/calmodulin were examined in an in vitro reconstitution system. In addition, the antibody epitopes were mapped by Western blot analysis of NTCB (2-nitro-5-thiocyanobenzoic acid) and CNBr (cyanogen bromide) fragments of caldesmon. Both C9 and C18 recognize an amino terminal fragment composed of amino acid residues 19 to 153. The C23 epitope lies within a fragment ranging from residues 230 to 386. Included in this region is a 13-residue repeat sequence. Interestingly this repetitive sequence shares sequence similarity with a sequence found in nuclear lamin A, a protein which is also recognized by C23 antibody. Therefore, it is likely that the C23 epitope corresponds to this 13-residue repeat sequence. A carboxyl-terminal 10K fragment contains the epitopes for antibodies C2 and C21. Among these antibodies, only C21 drastically inhibits the binding of caldesmon to F-actin/F-actin-tropomyosin filaments and tc Ca++/calmodulin. When the molar ratio of monoclonal antibody C21 to caldesmon reached 1.0, a maximal inhibition (90%) on the binding of caldesmon to F-actin filaments was observed. However, it required double amounts of C21 antibody to exhibit a maximal inhibition of 70% on the binding of caldesmon to F-actin-tropomyosin filaments. These results suggest that the presence of tropomyosin in F-actin enhances caldesmon's binding. Furthermore, C21 antibody also effectively inhibits the caldesmon binding to Ca++/calmodolin. The kinetics of C21 inhibition on caldesmon's binding to Ca++/calmodulin is very similar to the inhibition obtained by preincubation of caldesmon with free Ca++/calmodulin. This result suggests that there is only one Ca++/calmodulin binding domain on caldesmon and this domain appears to be very close to the C21 epitope. Apparently, the Ca++/calmodulin-binding domain and the actin-binding domain are very close to each other and may interfere with each other. In an accompanying paper, we have further demonstrated that microinjection of C21 antibody into living chicken embryo fibroblasts inhibit intracellular granule movement, suggesting an in vivo interference with the functional domains [Hegmann et al., 1991: Cell Motil. Cytoskeleton 20:109-120].
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970200203
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