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  • 1
    Electronic Resource
    Electronic Resource
    The fine structure of early tooth formation in an lguanid lizard, Anolis carolinensis (1985)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 183 (1985), S. 165-176 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Cytodifferentiation and hard tissue formation were studied in Anolis to collect information regarding the phylogenetic history of enamel and the functional significance of the events seen in the mammalian tooth during differentiation. The differentiation of the ameloblasts of Anolis, like that of mammals, shows two phases: In the early phase, the cells are short and rich in free ribosomes, in the late phase the cells elongate, develop an extensive rough endoplasmic reticulum, and the Golgi apparatus moves into that part of the cell next to the basal lamina (the cell apex). The early epithelial-mesenchymal interface resembles that of mammals, suggesting that early mechanisms of induction and epithelial-mesenchymal interaction are similar in Anolis and in mammals.Preameloblast processes and preameloblast-preodontoblast contacts in Anolis are rudimentary compared to those of mammals. While in mammals the preameloblast processes shape the future DEJ (dentin-enamel junction), their involvement in establishing the shape of the DEJ of Anolis is questionable. We suggest that the great development of preameloblast-preodontoblast contacts in mammals may simply increase the efficiency of inductive interactions between these cell types.
    Additional Material: 18 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051830205
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  • 2
    Electronic Resource
    Electronic Resource
    The ovarian cycle of the ring dove (Streptopelia risoria)Paper no. 349 from the Department of Genetics, Wisconsin Agricultural Experiment Station. (1945)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 77 (1945), S. 351-377 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 4 Tab.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1050770305
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  • 3
    Electronic Resource
    Electronic Resource
    A light microscopic study of the mononuclear cells infiltrating skin homografts in the garter snake, Thamnophis sirtalis (Reptilia: Colubridae)Submitted to the State University of New York, Upstate Medical Center, in partial fulfillment of the requirements for the degree of Doctor of Philosophy. Supported by Training grant GM-00326 and Research grant HD-03484 from the National Institutes of Health. (1972)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 137 (1972), S. 149-159 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The rejection of skin homografts in the snake, Thamnophis sirtalis is preceded by an infiltration of mononuclear cells into the graft bed. The initial arrangement of infiltrating cells in perivascular halos suggests that these cells emigrate from the blood stream of the host. A cytological study showed that the vast majority of the cells can be classified as small and mediumsized lymphocytes, monocytes and macrophages. Early stages of infiltration were associated with large proportions of lymphocytes while later stages were characterized by a predominance of macrophages. It was concluded that the mononuclear cells associated with graft rejection include large proportions of lymphocytes and macrophages and not just one kind of lymphoid cell.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051370203
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  • 4
    Electronic Resource
    Electronic Resource
    Fine structure of oocyte maturation in a crinoid echinoderm, Oxycomanthus japonicus: A time-lapse study by serial biopsy (1988)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 198 (1988), S. 205-217 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Natural maturation of the oocytes of Oxycomanthus japonicus can be predicte in advance, and the multiple ovaries permit unintrusive serial biopsies. Ovaries were fixed for transmission electron micrscopy at 15-min intervals before, during, and after oocyte maturation. The start of maturation of each oocyte is signaled by the breakdown of the germinal vesicle and the disruption of a macula adhaerens associating the oocyte with nongerminal cells of the ovary. This disruption is followed by an ovulation of the oocyte into the ovarian lumen. Ovulation takes about 1 hr, and a continuous vitelline coat is produced around the oocyte during this interval. Within the oocyte cytoplasm, patches of nuage and the annulate lamellae disappear at 30 and 45 min after the start of oocyte maturation, respectively. Micropapillae become transiently abundant at the oocyte surface both at the time of germinal vesicle breakdown and around the time when the first and second polar bodies are produced. Oocyte maturation takes about 2 hr from start to finish, and the emission of the second polar body marks the beginning of the stage of the ovum. Within the cytoplasm of the ovum, the haploid chromosomes develop into chromosome-containing vesicles, which later fuse into a single female pronucleus. Pronuclear ova are retained in the ovarian lumen for about 1 hr and are then spawned into the surrounding seawater, where fertilization takes place.
    Additional Material: 24 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051980207
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  • 5
    Electronic Resource
    Electronic Resource
    Tubulin dimer formation via the release of α- and β-tubulin monomers from multimolecular complexes (1992)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 23 (1992), S. 222-230 
    Details
    ISSN: 0886-1544
    Keywords: native electrophoresis ; tubulin isotypes ; dimerization ; complexes ; GTP binding ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The functional subunit of microtubules is a heterodimer consisting of α- and β-tubulin. An understanding of tubulin dimerization has been hampered because it has not proved possible to purify native tubulin monomers. To study the process whereby tubulin dimers are formed, we made use of tubulins synthesized by in vitro transcription and translation. We present evidence that the in vitro synthesis of different mouse α-tubulin isotypes involves a multimolecular complex. The synthesis of mouse β-tubulin isotypes also involves the formation of multimolecular complexes, though different isotypes behave somewhat differently from one another. The properties of in vitro synthesized α- and β-tubulin multimolecular complexes strongly suggest that they are intermediates in the biosynthesis of tubulin monomers. Upon release, these monomers can exchange with pre-existing tubulin heterodimers. © 1992 Wiley-Liss, Inc.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970230306
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  • 6
    Electronic Resource
    Electronic Resource
    Circulation and scale-up in bubble columns (1992)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 38 (1992), S. 76-82 
    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 liquid circulation model of Rice and Geary (1990) is extended to include turbulence originating at the wall. Thus, two possible length scales are considered: one originating from rising bubbles and the other emanating from the wall. The appropriate scale for small columns should be based on bubble size, while for larger systems the proper mixing length is proportional to column diameter. It is proposed that the film Reynolds number may be the key in distinguishing the two cases.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690380108
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  • 7
    Electronic Resource
    Electronic Resource
    Simulation of methane partial oxidation over silica-supported MoO3 and V2O5 (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 87-97 
    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: Microkinetic simulations have been carried out to describe the partial oxidation of methane over silica-supported molybdena and vanadia. The objective of this study was to formulate a physically reasonable reaction network to capture the basic aspects of the surface catalytic chemistry and to use this network to link methane oxidation kinetics with the kinetics observed for the oxidation of subsequent gaseous products, i.e., methanol, formaldehyde, and carbon monoxide. The most abundant reactive intermediates on the catalyst surface are suggested to be oxygen and hydroxyl groups. This reaction network successfully predicts the catalytic activities, selectivities, activation energies, and reaction orders observed over silica-supported molybdena and vanadia; and the microkinetic model also semiquantitatively explains the kinetic trends for related catalyst systems and is consistent with surface bonding energetics reported in the literature over various oxide catalysts. The microkinetic reaction network properly reduces to the more simple macrokinetic model reported previously for methane partial oxidation.
    Additional Material: 12 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370108
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  • 8
    Electronic Resource
    Electronic Resource
    Bubble size prediction for rigid and flexible spargers (1991)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 37 (1991), S. 161-168 
    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: There exists a narrow operating window in bubble columns where the motion is so gentle that the normally dominating forces of coalescence and breakup no longer define the bubble size, hence formation dynamics must control. Elementary force balances are presented to predict bubble size, which compares favorably with experimental data and is shown to be applicable to both rigid and flexible spargers. The main focus is on the prediction and performance of a small-holed flexisparger, for which it is proved that the gas momentum term is highly significant. Also, it is shown that the intermediate drag law is more appropriate than Stokes for forming bubbles.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690370202
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  • 9
    Electronic Resource
    Electronic Resource
    Prediction of liquid circulation in viscous bubble columns (1990)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 36 (1990), S. 1339-1348 
    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 new theory to predict liquid circulation was derived and compared with applicable literature data. A single dimensionless group, ε(gRd2/v2c), is shown to control mixing intensity under low-viscosity conditions, but two separate groups (ε and gRd2/v2c) are necessary for viscous systems. Closure was accomplished using the Prandtl model for Reynolds stress. Locally varying mixing length was taken to be proportional to bubble size and bubble concentration. The model was constructed based on the premise that two distinct zones exist: a mainly turbulent core joined to a thin viscous wall layer.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690360907
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  • 10
    Electronic Resource
    Electronic Resource
    Circulation model for absorption and dispersion in cocurrent bubble columns (1993)
    Hoboken, NJ : Wiley-Blackwell
    AIChE Journal 39 (1993), S. 224-234 
    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: Liquid circulation and a finite entrance zone are accounted for in modeling gas absorption into cocurrent flows of pure oxygen and CMC solutions. The new models lead to a Taylor-like correction factor to account for circulation in both absorption and transient dispersion experiments. Steady-state experiments for viscosities of 1, 12, 25 and 50 mPa·s were conducted by measuring dissolved gas concentration profiles along the column axis. Liquid mixing experiments were performed using the transient acid-base neutralization method, leading to measured values of axial dispersion coefficients which depended on viscosity to the power 0.75. Measurements suggest that circulation was minuscule owing to uniform gas injection by Flexisparger in the present column.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/aic.690390205
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