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  • Branchiopoda  (3)
  • Chemistry  (3)
  • morphology  (3)
  • GEOPHYSICS  (2)
  • Electroweak interactions
  • ddc:330
  • 1995-1999  (10)
Collection
Keywords
Publisher
Years
Year
  • 1
    Electronic Resource
    Electronic Resource
    A contribution to the systematics of the Streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 203-232 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; classification ; phylogeny ; fairy shrimp ; phyllopod
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract While developing a data base for phylogenetic analysis of the New World streptocephalids we compaired them with species from Africa, Europe, and India. In doing this, we found that the morphology of the peduncle of the distal antennal outgrowth and the biramous ovaries developed in seven North American species can contribute to the systematics of the genus. Thus, our investigation consisted of (1) a review of the external morphology of the antenna, (2) biometry of selected parts of the antenna to obtain informative ratios, (3) a review of the presence or absence of genetal linguiform outgrowths, extension of the non-retractile parts of the penes, and general morphology of the cercopods, (4) a study of the location of the ovaries, and extension of the brood-pouch. On the basis of the results we classifyStreptocephalus into nine species groups. Five subgroups are identified within two of the species groups Several implications of the present approach are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033815
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Diagnosis and phylogeny of the new world streptocephalidae (Branchiopoda: Anostraca) (1995)
    Springer
    Hydrobiologia 298 (1995), S. 15-44 
    Details
    ISSN: 1573-5117
    Keywords: Streptocephalus ; morphology ; systematics ; North America ; new species ; cladistics ; fairy shrimp
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present an updated diagnosis of 13Streptocephalus species of North America. Three new species are included. A key to the species is provided. The phylogeny of the group is discussed on the basis of (1) a systematic approach (Maeda-Martinezet al., 1995; this volume), which considers the entire distal antennal outgrowth, the frontal appendage, and the morphology of the ovaries as essential in defining different genetic lineages or species-groups, and (2) a cladistic analysis. We suggest that of nine monophyletic groups, three are represented in both the Old and New World. Thus, contrary to former disparsalist hypotheses, we argue that the New World species represent relict forms of ancestral groups fragmented by continental drift (vicariance model).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00033798
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    On potentials and relevance of the use of copulatory structures in anostracan taxonomy (1997)
    Springer
    Hydrobiologia 359 (1997), S. 83-92 
    Details
    ISSN: 1573-5117
    Keywords: Branchiopoda ; Anostraca ; genital morphology ; genus concept
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract This paper reviews and extends the knowledge of anostracan penile morphology and its taxonomic significance. Since Linder‘s pioneering classification(based partly on male genital characters), the morphology of both basal and distal penile parts has been applied repeatedly to reorganize or establish higher anostracan taxa, or to extend their diagnoses. In general, the configuration of both basal and distal penile structures follows a constant pattern in well-defined genera. Size and shape of processes and spinulation on the basal (in Linderiella and Chirocephalidae) and the distal parts (in Parartemia), however, may show inter-specific differences. Variability in penile structures in the current genus Brachinella indicates the need for a taxonomic revision of this genus. Similar intra-generic penis morphology may contribute to hybridizability of congeners and validate Dubois‘genus concept for use in anostracans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003125812020
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  • 4
    Electronic Resource
    Electronic Resource
    Branchinella maduraiensis Raj (Crustacea, Branchiopoda, Anostraca) shown by new evidence to be a valid species (1997)
    Springer
    Hydrobiologia 359 (1997), S. 93-99 
    Details
    ISSN: 1573-5117
    Keywords: Branchiopoda ; Branchinella ; taxonomy ; morphology ; India
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The fairy shrimp Branchinella kugenumaensis (Ishikawa) was long considered a widely, though disjunctly, distributed species occurring from Japan through eastern Asia to southern India. Attempts by Raj (1951, 1961) to make the Indian populations a new variety (B. k. var. madurai) on the basis of antennal and frontal appendage morphology and on its distribution pattern, were considered unconvincing by later authors. Our new comparison of Japanese and Indian specimens has revealed several differences. The resting egg shells of B. kugenumaensis from Japan have irregular polygonal fields; whereas, the shells of the Indian taxon have lip-like units covered with spinules. Furthermore, there are lobes lateral to the basal penes in the Indian specimens that are lacking in the Japanese taxon. As well as differences in antennal and frontal appendage morphology. These differences correspond with previous illustrations of populations from both geographic regions and lead us to consider Raj's proposed subspecies as a valid species. This brings the number of accepted species in the genus Branchinella to 34. More specimens will need to be evaluated from the area between India and Japan to determine if B. maduraiensis is endemic to the Indian subcontinent or is more broadly distributed on the Asian mainland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003173727950
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  • 5
    Electronic Resource
    Electronic Resource
    Large branchiopod assemblages common to Mexico and the United States (1997)
    Springer
    Hydrobiologia 359 (1997), S. 45-62 
    Details
    ISSN: 1573-5117
    Keywords: Crustacea ; Branchiopoda ; community ecology ; sympatry ; co-occurrence ; temporary pools
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract We present observations on the frequency of large branchiopod associations found in north-central Mexico, and in Arizona, USA. Of a total of 25 species involved in these assemblages, 12 were common in both areas. Fifty-eight (43.3%) of the ponds in Mexico, and seventy-eight (47%) of those in Arizona had two or more species present. The combinations of species which occurred with highest frequency were Streptocephalus mackini with Thamnocephalus platyurus for Arizona, and T. platyurus, Triops sp., and Leptestheria compleximanus for Mexico. In Mexico, and Arizona, as in many parts of the world, multispecies assemblages of large branchiopods are a common phenomenon. Therefore, the ’common rule‘ of’one-phyllopod-per-habitat‘ advanced by Weise (1964) is inconsistent with field observations. Furthermore, since cases of co-occurrence of two or more congeneric species of Anostraca and Notostraca are not uncommon, generalizations about congeners not coexisting remain applicable only for the Spinicaudata and Laevicaudata. On the basis of the literature, and of observations in the field and in the laboratory, we list potential factors contributing to the co-occurrence of several species within a pond.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1003102601542
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  • 6
    Electronic Resource
    Electronic Resource
    In situ FTIR investigation of MMA plasmas, plasma-polymerized films, and reaction mechanisms (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 587-602 
    Details
    ISSN: 0887-624X
    Keywords: plasma polymerization ; methyl methacrylate ; in situ FTIR/ATR diagnostic ; in situ FTIR plasma diagnostic ; analysis of variance ; regression analysis ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Methyl methacrylate (MMA) plasmas and plasma-polymerized methyl methacrylate (PPMMA) films were studied in situ with FTIR and FTIR/ATR (attenuated total reflection) in an r.f. capacitively coupled glow discharge. A statistically designed experiment was conducted by varying the r.f. power, process pressure, and MMA flow rate. MMA plasma fragments were identified from the gas-phase FTIR measurements. They include the intermediate species such as dimethylketene, formaldehyde, allene, and propene; small hydrocarbons such as acetylene, methane, and ethylene; and oxygenates such as carbon dioxide, carbon monoxide, and methanol. Statistical analysis techniques (correlation analysis, analysis of variance and regression analysis) were used on both gas and film data. Gas-phase reaction mechanisms are proposed, and the relationship between the gas and film data is investigated to understand the film deposition chemistry. The deposition rate is positively correlated to the relative concentrations of MMA fragments which are identified as the major film precursors in the deposition process. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 587-602, 1998
    Additional Material: 11 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Spectral narrowing in optically pumped poly (p-phenylenevinylene) FilmsWe thank Cambridge Display Technology (CDT) for supplying the PPV precursor used in this research. This work is supported by the Engineering and Physical Sciences Research Council, and is part of a collaborative program with the chemistry group of A. B. Holmes and S. C. Moratti in Cambridge. (1997)
    Weinheim : Wiley-Blackwell
    Advanced Materials 9 (1997), S. 547-551 
    Details
    ISSN: 0935-9648
    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
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/adma.19970090705
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  • 8
    Electronic Resource
    Electronic Resource
    Computer simulation of high-speed spinning of PETThis article is based on the thesis of Jeffrey S. Denton, North Carolina State University (1993). (1995)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 57 (1995), S. 939-951 
    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
    Notes: An interactive computer simulation of the steady-state melt spinning of poly(ethylene terephthalate) was developed based upon a combination of physical laws and empirical relationships. The simulation incorporates crystallization effects which makes it valid for a wide range of take-up speeds. Modifications to the conventional threadline that allow judicious control over the threadline dynamics were modeled and included in the simulation for exploration of the effects of these perturbations. The modifications include quenching and on-line zone heating. The simulation was verified using experimental measurements of threadline diameter, velocity, and temperature at 3000, 4000, 5000, and 6000 m/min take-up. Off-line measurements of crystallinity and birefringence were also compared with the values calculated by the simulation at these speeds. © 1995 John Wiley & Sons, Inc.
    Additional Material: 20 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1995.070570806
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  • 9
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    Low-frequency fluctuations in the magnetosheath near the magnetopause (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: There are four low-frequency modes which may propagate in a high-beta nearly bi-Maxwellian plasma. These are the magnetosonic, Alfven, ion acoustic, and mirror modes. This manuscript defines a procedure based on linear Vlasov theory for the unique identification of these modes by use of transport ratios, dimensionless ratios of the fluctuating field and plasma quantities. A single parameter, the mode deviation is calculated using the plasma and magnetic field data gathered by the Active Magnetospheric Particle Tracer Explorers/Ion Release Module (AMPTE/IRM) spacecraft to identify the modes observed in the terrestial magnetosheath near the magnetopause. As well as determining the mode which best describes the observed fluctuations, it gives us a measure of whether or not the resulting identification is unique. Using 17 time periods temporally close to a magnetopause crossing, and confining our study to the frequency range from 0.01 to 0.04 Hz, we find that the only clearly identified mode in this frequency range is the mirror mode. Most commonly, the quasi-perpendicular mirror mode (with wave vector k roughly perpendicular to the background magnetic field B(sub zero) is observed. In two events the quasi-parallel mirror mode k parallel B(sub zero) was identified.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A4; p. 5665-5679
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    An MHD simulation study of the poloidal mode field line resonance in the Earth's dipole magnetosphere (1995)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The poloidal mode field line resonance in the Earth's dipole magnetic field is investigated using cold plasma ideal MHD simulations in dipole geometry. In order to excite the poloidal mode resonance, we use either an initial or a continuous velocity perturbation to drive the system. The perturbation is localized at magnetic shell L = 7 with plasma flow in the radial direction (electric field component in the azimuthal direction). It is found that with the initial perturbation alone, no polodial mode resonance can be obtained and the initially localized perturbation spreads out across all magnetic L shells. With the continuous perturbation, oscillating near the poloidal resonance frequency, a global-scale poloidal cavity mode can be obtained. For the first time, a localized guided poloidal mode resonance is obtained when a radial component of electric field is added to the initial perturbation such that the curl of the electric field is everywhere perpendicular to the background dipole magnetic field. During the localized poloidal resonance, plasma vortices parallel/antiparallel to the background dipole magnetic field B(sub 0). This circular flow, elongated radially, results in twisting of magnetic field flux tubes, which, in turn, leads to the slowdown of the circular plasma flow and reversal of the plasma vortices. The energy associated with the localized poloidal resonance is conserved as it shifts back and forth between the oscillating plasma vortices and the alternately twisted magnetic flux tubes. In the simulations the eigenfunctions associated with the localized poloidal resonance are grid-scale singular functions. This result indicates that ideal MHD is inadequate to describe the underlying problem and nonideal MHD effects are needed for mode broadening.
    Keywords: GEOPHYSICS
    Type: Journal of Geophysical Research (ISSN 0148-0227); 100; A1; p. 63-77
    Format: text
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    NASA TECHNICAL REPORTS
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