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  • 1
    Electronic Resource
    Electronic Resource
    Rubidium vanadium pyrophosphate RbV3P4O17+x (x = 0.14): a novel mixed-valence vanadium pyrophosphate (1990)
    s.l. : American Chemical Society
    Inorganic chemistry 29 (1990), S. 3298-3301 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00343a009
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  • 2
    Electronic Resource
    Electronic Resource
    Stereoselectivity and dehalogenation mechanisms. The elimination reactions of meso- and dl-stilbene dibromides with iodide in methanol (1970)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 92 (1970), S. 4602-4609 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00718a022
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  • 3
    Electronic Resource
    Electronic Resource
    Resting egg formation and hatching of the S-type rotifer Brachionus plicatilis at varying salinities (1989)
    Springer
    Marine biology 103 (1989), S. 327-332 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The effect of salinity on resting egg formation and hatching in the marine rotifer Brachionus plicatilis rotundiformis (S-type Hawaiian stock) was examined in 1986. B. plicatilis was cultured at three salinity levels. The average number of resting eggs produced at 8, 16 and 32 ppt ranged from 22 to 615 per 10 000 rotifers, or 29 to 413 per 1.0x108 Tetraselmis cells. Data on the rate of mictic female appearance, fertilization and fecundity of fertilized mictic females support these findings. Results indicated that the sexual reproduction of L- and S-type rotifers have opposing responses to salinity. After preservation for 2 mo at 5°C, simultaneous hatching of resting eggs was observed at six salinity levels at 30°C. Development time was extended and hatching rate decreased when eggs formed at 8 ppt were incubated at extremely high (40 ppt) or low (1 ppt) salinities. Hatching rates varied from 69 to 93%, and were influenced by the salinity present at the time of egg formation and incubation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397266
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  • 4
    Electronic Resource
    Electronic Resource
    The cyclization of mouse satellite DNA (1971)
    Springer
    Chromosoma 33 (1971), S. 284-296 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Sheared fragments of mouse satellite DNA can form rings and other circular structures by several techniques. „Folded rings“ are formed if the sheared fragments are simply annealed, indicating that shearing produces single-chain terminals, and that the repetitious sequence is shorter than the exposed ends. The occurrence of folded rings can be sharply reduced by prior treatment with single-chain specific endonuclease, and significantly increased if the fragments are treated with exonuclease III. Denaturation of satellite DNA followed by reassociation of the single chains results in the formation of “slipped rings”. These characteristics of the DNA lead to the conclusion that the sequences of the mouse satellite DNA are arranged in a tandemly repetitious manner.-About 20% of the DNA fragments from the “main band” cyclize after partial exonuclease III degradation, but not before this treatment. This indicates that a large fraction of the main band DNA is tandemly repetitious, but that the length of the repetitious sequence is on the average longer than the single-chain terminals produced by shearing.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00284946
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  • 5
    Electronic Resource
    Electronic Resource
    Heterochromatic chromosomes and satellite DNAs of Drosophila nasutoides (1975)
    Springer
    Chromosoma 51 (1975), S. 65-73 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Drosophila nasutoides is distinguished from other Drosophila species in that the metaphase karyotype shows a pair of very large V-shaped chromosomes. With Giemsa, a distinctive C-banding pattern is revealed along the arms of this large chromosome, indicating a largely heterochromatic nature. Furthermore, the banding patterns of the arms are symmerical, indicating that it is an iso-chromosome. A comparison between the metaphase karyotype and polytene chromosomes suggests that the large V chromosome appears as the dot chromosome in polytene squash. One autosome has twice the arm length of typical Drosophila polytene chromosomes and arose either by centric fusion and a pericentric inversion, or by translocation connecting distal ends with a subsequent loss of one centromere. This chromosome appears to have a short arm which ectopically pairs with the proximal region of the long arm, representing a duplication of about ten bands. When the nuclear DNA is examined by neutral CsCl gradient, four satellites are observed. As much as sixty percent of the total DNA appears as satellites in the lysate of larval brains. No satellite was detectable in the lysate of salivary glands. These observations led us to suggest that the heterochromatic nature of the large V chromosome is due to the presence of all four satellites in this chromosome and that this large chromosome appears as the dot because of the under-reduplication of the satellites during polytenization.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00285809
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  • 6
    Electronic Resource
    Electronic Resource
    Localization of Drosophila nasutoides satellite DNAs in metaphase chromosomes (1978)
    Springer
    Chromosoma 70 (1978), S. 41-50 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract Metaphase chromosomes of D. nasutoides were hybridized situ with 3H-cRNA synthesized from the four satellites which make up 50–60% of the total DNA of this species. All four satellites were localized in the large, metacentric, heterochromatic chromosome four. They did not, however, appear to hybridize to centromeric or other constitutive heterochromatin, nor did they, with the exception of satellite I, seem to hybridize in the specific regions of chromosome four which, on the basis of C, Q, and H banding and AT contents, were predicted to contain some of these satellites. —Comparison of grain patterns with the results of fluorescent staining indicated that satellite-bearing heterochromatin was not always associated with other fractions of constitutive heterochromatin in interphase nuclei and was, at least partially, decondensed in some larger nuclei.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00292214
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  • 7
    Electronic Resource
    Electronic Resource
    Restriction enzyme analysis of a highly diverged satellite DNA from Drosophila nasutoides (1981)
    Springer
    Chromosoma 83 (1981), S. 367-379 
    Details
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The satellite II DNA of Drosophila nasutoides is a highly diverged repetitive DNA, showing about 17% base changes between repeat units (Cordeiro-Stone and Lee, 1976). This DNA is cleaved by four different restriction enzymes to produce multimeric fragmentation patterns, indicating that their restriction sites are regularly arranged. Moreover, all four enzymes produce identical fragment lengths, the size of a monomer being 96 base pairs. Such multimeric patterns are expected for a diverged repetitive DNA, since many restriction sequences could have undergone changes during sequence divergence. Further restriction analyses of this DNA by double digestions and cloning reveal that there are three different sequences in satellite II DNA with respect to the presence and the arrangement of various restriction sites (Fig. 7). As an example, one sequence contains many EcoRI sites and fewer Hinfl sites (20% of EcoRI sites), which are arranged regularly. These observations suggest that satellite II DNA of D. nasutoides might have evolved through different modes of sequence divergence.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00327359
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  • 8
    Electronic Resource
    Electronic Resource
    The electronic structures and properties of Alq3 and NPB molecules in organic light emitting devices: Decompositions of density of states (2000)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 112 (2000), S. 8614-8620 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: A decomposition treatment of density of states in combination with PM3 molecular orbital calculations was used to reveal the fingerprints of electronic structures of two prototypical electroluminescent molecules, tris(8-hydroxy-quinoline)aluminum (Alq3) and N,N′-bis(1-naphthyl)-N,N′-diphenyl-1,1′-biphenyl-4,4′-diamine (NPB). High convenience and accuracy of such a treatment were found for these large organic molecules in the determinations of (1) the distribution of important molecular orbitals such as the highest occupied orbital and the lowest unoccupied orbital; (2) the contribution to valence and conduction bands as well as gap states from constituent atoms, and thus the attribution of ultraviolet photoemission spectrum; (3) the sites and properties of reaction and excitation of a molecule; and (4) the localization property of electronic states. In particular, this study indicates that Alq3 is most possibly attacked by other atoms at the oxygen atoms while the reaction site for NPB is at the nitrogen atom. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.481462
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  • 9
    Electronic Resource
    Electronic Resource
    Benzo-derivatives of mutagenic-carcinogenic 2-aminodipyrido[1,2-a:3',2'-d]imidazole
    Amsterdam : Elsevier
    Mutation Research/Environmental Mutagenesis and Related Subjects 147 (1985), S. 264 
    Details
    ISSN: 0165-1161
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Medicine
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0165-1161(85)90089-5
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  • 10
    Electronic Resource
    Electronic Resource
    Intramolecular energy flow and bond dissociation in iodoacetylene and iododiacetylene (1994)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 101 (1994), S. 4668-4681 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Intermolecular and intramolecular energy flow and subsequent bond dissociation in collinear collisions I–C≡C–H+Ar and I–C≡C–C≡C–H+Ar have been studied by classical trajectory techniques over the collision energy range of 0 to 10 eV. When the molecule is initially in the ground state, the overall energy transfer in I–C≡C–H+Ar is very small, but in I–C≡C–C≡C–H+Ar it is large. The collisionally perturbed C–H bond stores a large amount of energy from translation for a brief period during the early stage of collision and transfers most of it to the inner region of the molecule, specifically to the low frequency C–I vibration. Thus the high-frequency vibration of the perturbed C–H bond during the collision plays a crucial role in determining the extent of intramolecular energy transfer and, in turn, C–I dissociation. But in nondissociative collisions, there is another series of the C–H vibration at the latter stage of collision, transferring energy back to translation. This study also considers collision-induced intramolecular energy flow in the molecule with an initially excited C–H bond. The relaxation of the low-lying C–H excitation is very slow on a nanosecond time scale. However, when the excitation is high, the vibrational frequency of the C–H bond is significantly weakened, thus becoming comparable to that of the triple bond, in which case the isolating effect of the adjacent C≡C bond is no longer important and intramolecular energy flow becomes efficient.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.467456
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