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  • Polymer and Materials Science  (49)
  • Cell & Developmental Biology  (28)
  • ACOUSTICS  (25)
  • 1
    Electronic Resource
    Electronic Resource
    The structure and function of the gill tufts in larval Amphipterygidae (Odonata: Zygoptera) (1966)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 120 (1966), S. 9-21 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Larvae of the subfamily Amphipteryginae (Odonata) bear a tuft of tracheal gills on either side of the anus. The two tufts are derived from the laminae sub-anales, and are protected by the non-respiratory epiproct and paraprocts, and by plates derived from the cerci, lamina supra-analis or the lamina sub-analis itself. Each is approximately 1 mm long in mature larvae and comprises a series of repeatedly branching filaments, the terminal twigs of which are 5 to 10 μ in diameter. The total surface area of the tufts is approximately 5.0 mm2 in mature larvae of Devadatta, and more in the larvae of Pentaphlebia and Rimanella. Each tuft is connected by a large trachea to the longitudinal tracheal trunk. This large trachea divides many times, eventually forming a dense palisade of tracheoles in the epidermis of the filaments, immediately beneath the thin investing cuticle.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051200103
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  • 2
    Electronic Resource
    Electronic Resource
    The cephalic endocrine system in the thysanura (1963)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 113 (1963), S. 359-373 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1051130304
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  • 3
    Electronic Resource
    Electronic Resource
    Ultrastructure of prothoracic glands during larval-pupal development of the tobacco hornworm, Manduca sexta: A reappraisal (1993)
    New York, NY : Wiley-Blackwell
    Journal of Morphology 216 (1993), S. 95-112 
    Details
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The structure of Manduca sexta prothoracic glands was investigated using a protocol that preserves membranes. During the last larval stadium, prothoracic gland cells increase in diameter, volume, protein content, and perhaps number, enhancing their capacity to produce ecdysteroids. The glands' strand-of-cells morphology, their in situ location, the presence of gap junctions between cells, and junctional foot-like structures within cells support previous findings that prothoracicotropic hormone stimulates ecdysteroidogenesis via Ca2+-induced Ca2+ release. A different method of tissue fixation from that previously used to investigate the ultrastructure of Manduca sexta prothoracic glands has revealed a significantly different ultrastructure. These new findings begin to define roles for endoplasmic reticulum and mitochondria in ecdysteroid synthesis and support the hypothesis that the glands secrete the steroid hormone via exocytosis. The structural dynamics of the glands are discussed in the context of the glands' function during Manduca sexta larvalpupal development. © 1993 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jmor.1052160110
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  • 4
    Electronic Resource
    Electronic Resource
    Chemoreceptor-mediated polymerization and depolymerization of actin in hair bundles of sea anemones (1995)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 30 (1995), S. 208-220 
    Details
    ISSN: 0886-1544
    Keywords: Key words: stereocilia, N-acetylated sugars, proline receptor, nematocyst discharge ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: Hair bundles located on tentacles of sea anemones are morphodynamic mechanoreceptors employed to regulate discharge of nematocysts into swimming prey. Activation of chemoreceptors for N-acetylated sugars is known to induce anemone hair bundles to elongate while shifting discharge to lower frequencies matching those produced by calmly swimming prey. In the continued presence of N-acetylated sugars, activation of proline receptors is known to induce hair bundles to shorten while shifting nematocyst discharge to higher frequencies presumed to correspond to movements produced by wounded, struggling prey. In the present study, N-acetylneuraminic acid (NANA) causes stereocilia to become more intensely fluorescent in confocal optical sections of phalloidin-stained specimens, suggesting that receptors for N-acetylated sugars initate processes to increase the density of F-actin within stereocilia. Computer analysis of electron micrographs is consistent with this interpretation for large diameter stereocilia but not for small diameter stereocilia. In the continued presence of NANA, proline causes flurescence intensity of phalloidin to decrease to or below control levels. DNaseI uniformly stains large diameter stereocilia, suggesting that these stereocilia contain a pool of G-actin. Fluorescence intensity of DNaseI in stereocilia is significantly less bright in specimens exposed to NANA alone than in specimens exposed to proline in the continued presence of NANA. It appears that whereas activated receptors for NANA induce G-actin to polymerize in large diameter stereocilia, activated receptors for proline induce F-actin to depolymerize, restoring G-actin pools. © 1995 Wiley-Liss, Inc.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970300305
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  • 5
    Electronic Resource
    Electronic Resource
    Nucleotide sequence and organization of the transforming region and large terminal redundancies (LTR) of avian myeloblastosis virus (AMV) (1982)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 20 (1982), S. 95-103 
    Details
    ISSN: 0730-2312
    Keywords: acute leukemia virus ; transforming gene ; DNA sequencing ; LTRs, nucleotides ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Avian mycloblastosis virus (AMV) is a replication-defective acute leukemia virus, requiring a helper virus to provide the viral proteins essential for synthesis of new infectious virus. The genome of the AMV has undergone a sequence substitution in which a portion of the region normally coding for the “env” protein has been replaced by chicken cellular sequences. These latter sequences are essential for the transforming activity of the virus. We have determined the complete nucleotide sequence of this region. Examination of the AMV oncogenic sequence revealed an open reading frame starting with the initiation codon ATG within the acquired cellular sequences and terminating with the triplet TAG at a point 33 nucleotides into helper viral sequences to the right of helper-viral-cellular junction. The stretch of 795 nucleotides would code for a protein of 265 amino acids with a molecular weight of 30,000 daltons. The eleven amino acids at the carboxy terminus of such a protein would be derived from the env gene of helper virus.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240200202
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  • 6
    Electronic Resource
    Electronic Resource
    Epidermis generated in vitro: practical considerations and applications (1991)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 45 (1991), S. 245-251 
    Details
    ISSN: 0730-2312
    Keywords: epidermis ; skin ; skin graft ; cell culture ; in vitro ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: The technology for culture of epidermis is one of the most advanced to date for generation of a tissue in vitro. Cultured epidermis is already used for a number of applications ranging from use as a permanent skin replacement to use as an organotypic culture model for toxicity testing and basic research. While simple epidermal sheets have been grafted successfully, more advanced models for skin replacement consisting of both dermal and epidermal components are in development and being tested in a number of laboratories. One of the most advanced in vitro models is the living skin equivalent, an organotypic model consisting of a collagen lattice contracted and nourished by dermal fibroblasts overlaid with a fully formed epidermis.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jcb.240450304
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  • 7
    Electronic Resource
    Electronic Resource
    DTA of polyglycine (1967)
    New York : Wiley-Blackwell
    Biopolymers 5 (1967), S. 1029-1031 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1967.360051014
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  • 8
    Electronic Resource
    Electronic Resource
    The viscometric behavior of native and relaxed closed circular PM2 DNAs at intermediate and high ethidium bromide concentrations (1977)
    New York : Wiley-Blackwell
    Biopolymers 16 (1977), S. 1343-1356 
    Details
    ISSN: 0006-3525
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: We have measured the specific viscosity of closed circular PM2 DNA in the presence of concentrations of ethidium bromide ranging up to 5 mg/ml. Both native viral PM2 DNA I and enzymatically prepared relaxed, closed circular PM2 DNA I0 exhibit a complex dependence of the specific viscosity upon the extent of supercoiling. As the number of superhelical turns is increased in the positive sense from zero, the viscosity first decreases to a minimum, then passes through a secondary maximum, and eventually again increases as the dye-induced duplex unwinding proceeds. In the case of DNA I, a corresponding behavior is mirrored in the negative sense as dye is removed from the principal viscometric maximum (complete relaxation of the DNA by dye). The shape of the curve relating specific viscosity to extent to supercoiling is similar for superhelical DNAs of either handedness, a result which we interpret to mean that the influence of any regions of special secondary structure (such as denatured loops) upon the viscosity is minimal. At very high dye concentrations the specific viscosity decreases dramatically. This effect might arise either from intermolecular aggregation or from a dye-induced collapse in the DNA secondary structure.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/bip.1977.360160614
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  • 9
    Electronic Resource
    Electronic Resource
    Effect of hypoxia on hepatic DNA methylation and tRNA methyltransferase in rat: Similarities to effects of methyl-deficient diets (1996)
    New York, N.Y. : Wiley-Blackwell
    Journal of Cellular Biochemistry 61 (1996), S. 72-80 
    Details
    ISSN: 0730-2312
    Keywords: hypoxia ; S-adenosylmethionine ; DNA methylation ; hypomethylation ; t-RNA methyltransferase ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Young rats were maintained in a 10% oxygen atmosphere for 2, 6, and 10 days and administered normal rat chow and water ad libitum. Thereafter, their hepatic S-adenosyl-L-methionine (AdoMet) and activity and mRNA levels of AdoMet synthetase were assayed. AdoMet levels decreased by 45% after 10 days; hepatic AdoMet synthetase also declined by ∼40%. In rats with low hepatic AdoMet, the mRNA level of AdoMet synthetase also declined by up to 80%. No significant change in AdoMet or AdoMet synthetase was noted in pair-fed normoxic rats. DNA hypomethylation was determined in terms of incorporation of [3H]methyl of AdoMet incorporated at unmethylated sites in DNA in reactions mediated by methylases Hpall and Sssl. As compared to the normal hepatic DNA, [3H]methyl group incorporation in the 10-day hypoxic DNA was almost double in the Hpall-mediated reaction and ∼10-fold in the Sssl-mediated reaction. Hepatic tRNA methyltransferase activity doubled after 10 days of hypoxia. However, hypoxic rats showed no detectable mRNA transcripts for c-myc and c-fos oncogenes on Northern blot analysis. These observations show that because of subnormal activity of AdoMet synthetase, hypoxic liver is depleted of AdoMet, even when the animals are administered a complete diet. However, unlike rats on chronic lipotrope-deficient diets, hypoxic rats on a complete diet show no aberrant expression of oncogenes. © 1996 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
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  • 10
    Electronic Resource
    Electronic Resource
    An interpretation of acceleration by thiourea and related compounds of the tetramethylthiuram disulfide vulcanization of natural rubber (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 3 (1960), S. 373-374 
    Details
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1960.070030921
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