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  • 1
    Electronic Resource
    Electronic Resource
    Line-shape analysis of reflectance spectra from GaAs/AlAs multiple-quantum-well structures (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 67 (1990), S. 2501-2505 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The reflectance spectra from six GaAs/AlAs multiple-quantum-well structures have been analyzed with a multilayer classical dielectric function model which describes in detail the propagation of light through these microstructures. The model predicts accurately the observed line shapes. It can be used for the analysis of the reflectance or transmission spectra of any semiconductor multilayer structure.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.345501
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  • 2
    Electronic Resource
    Electronic Resource
    New aliphatic boronate ligands for affinity chromatography
    Amsterdam : Elsevier
    Journal of Chromatography A 625 (1992), S. 91-99 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(92)85190-5
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  • 3
    Electronic Resource
    Electronic Resource
    New ligands for boronate affinity chromatography
    Amsterdam : Elsevier
    Journal of Chromatography A 687 (1994), S. 61-69 
    Details
    ISSN: 0021-9673
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0021-9673(94)00863-9
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  • 4
    Electronic Resource
    Electronic Resource
    Synthesis and X-ray crystal structure investigation of a potential boronate affinity chromatography ligando-boronobenzalmethoxyamine (1994)
    Springer
    Journal of chemical crystallography 24 (1994), S. 621-626 
    Details
    ISSN: 1572-8854
    Keywords: Boronate ; o-Boronobenzalmethoxyamine ; [o-formylbenzeneboronic acid(III)]
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract A potential boronate affinity chromatography ligando-boronobenzalmethoxyamine (IV) and its precursor [o-formylbenzeneboronic acid (III)] were synthesized and characterized by three-dimensional single-crystal X-ray diffractometry. Both compounds contained no bonding between the boron atoms and the oxygen atoms [O(3)] of the distinguishing functional group. In addition,11B NMR data confirmed the lack of any coordination between the boron and oxygen atoms in the boronic acid compoundsIII andIV and the catachol ester derivative (V) ofIV.o-Formylbenzeneboronic acid (III) crystallizes in space groupP21/n witha=3.883(1),b= 13.225(1),c=14.029(2) Å, β=92.16(1)o, and four molecules per unit cell.o-Boronobenzalmethoxyamine (IV) crystallizes in space group Pcen witha=14.158(2),b=17.156(1),c=7.734(2)Å, and eight molecules per unit cell. Selected bond distances and angles are tabularized.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01671677
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  • 5
    Electronic Resource
    Electronic Resource
    Cellular energy levels and their effect on male cell abortion in cytoplasmically male sterile lines of Petunia hybrida (1989)
    Springer
    Sexual plant reproduction 2 (1989), S. 167-172 
    Details
    ISSN: 1432-2145
    Keywords: Cytoplasmic male sterility ; Micro sporogenesis ; Pollen ; Tapetum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Using an HPLC method it has proved possible to follow the levels of adenine and pyridine nucleotides in the anthers of normal and cytoplasmically male sterile (CMS) lines of Petunia hybrida. Well before the appearance of any structural differences, anthers of CMS plants begin to show lower ATP/ADP ratios. In anthers, as in other non-photosynthetic plant tissues, there is a strong correlation between the ATP/ADP ratio and levels of NADPH and, when NADPH was assayed in fertile and CMS anthers, very dramatic differences were discovered. In male fertile plants, the NADPH/NADP ratio differs strikingly between somatic and reproductive tissues and reaches a peak in anthers at the early prophase of meiosis. The ratio in male sterile anthers remains largely unchanged from that normally seen in somatic tissues over this period. A cytochemical localisation technique revealed that, at the stage of development in question, the major reserves of anther NADPH are held within the tapetal cells and that levels within CMS tapeta are strikingly lower than those of normal plants. These findings are discussed in the perspective of theories proposed to explain the operation of CMS, and also in terms of the now conclusive evidence that the genetical basis of CMS lies in changes in the organisation of the mitochondrial genome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00192763
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  • 6
    Electronic Resource
    Electronic Resource
    Cytoplasmic male sterility in Petunia hybrida: factors affecting mitochondrial ATP export in normal and cytoplasmically male sterile plants (1988)
    Springer
    Theoretical and applied genetics 76 (1988), S. 305-310 
    Details
    ISSN: 1432-2242
    Keywords: ADP-ATP translocator ; Cytoplasmic male sterility ; Mitochondrial inner membrane ; Pollen development
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary In view of accumulating evidence that cytoplasmic male sterility (CMS) in some species results from an inability to generate the high ATP/ADP ratios required for specific stages of differentiation in the reproductive cycle, a number of aspects of ATP metabolism are being examined in CMS and male fertile plants. In experiments designed to test mitochondrial efficiency in ATP export, organelles from CMS plants performed very poorly when compared with normal lines. It is proposed that although most of the molecules involved in mitochondrial ATP production are nuclear encoded, the lesions in mitochondrial (mt)DNA known to accompany the CMS phenotype may be expressed as small modifications within the architecture of the mitochondrial membrane. To detect whether such changes could affect the ADP-ATP translocator in the membrane, two sets of experiments were carried out to determine a ‘Km’ for the translocator. The two methods employed were based on different precepts, but nevertheless indicated a ‘Km’ for the mitochondrial translocator in CMS lines which differed dramatically from that of male fertile plants. The view that CMS in Petunia hybrida thus might result from small differences in mtDNA encoded membrane proteins is considered in the light of the cytological changes seen to accompany CMS in these plants, as well as in the context of current theories advanced to explain CMS in other species.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00257860
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  • 7
    Electronic Resource
    Electronic Resource
    DNA synthesis and cytoplasmic differentiation in tapetal cells of normal and cytoplasmically male sterile lines of Petunia hybrida (1987)
    Springer
    Theoretical and applied genetics 74 (1987), S. 846-851 
    Details
    ISSN: 1432-2242
    Keywords: Cytoplasmic male sterility ; DNA synthesis ; Mitochondria ; Pollen development ; Tapetum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A new method is described by which tapetal cells may be isolated from anthers of cytoplasmic male sterile (CMS) and fertile lines of Petunia hybrida. Using a combination of stereometry and Feulgen densitometry it has been possible to chart DNA synthesis and nuclear division with great precision within these cells. Results are presented which show CMS lines both to synthesize far less DNA than the fertiles and also to undergo less cell division. These differences in DNA kinetics and cytokinesis are obvious long before any differences between sterile and fertile lines may be detected in the meiocyte mass. In addition to these difference in nuclear behaviour, the tapetal cells of CMS lines also synthesize far lower levels of rough endoplasmic reticulum than do their fertile counterparts. Again, this difference is evident at a very early stage of anther development when all other cell components, including mitochondria and plastids, appear normal. These data are discussed in terms of the very special differentiation undergone by tapetal cells in angiosperms, and the conclusions drawn are considered in the perspective of current hypotheses proposed to explain the operation of CMS.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00247567
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  • 8
    Electronic Resource
    Electronic Resource
    Creep features of Al2O3-Al alloy composites (1994)
    Springer
    Journal of materials science 29 (1994), S. 4618-4624 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract Creep features of two cast aluminium alloy composites reinforced by Al2O3 short fibres randomly oriented in the matrices have been studied at 300 °C and several stress levels. The presence of short-term negative creep in primary creep is an important feature for the composites, which resulted from randomly oriented fibres strongly resisting dislocation creep in the matrix. However, the negative creep magnitude depended on both the applied stress and the nature of the material. There was a critical stress for the presence of the short-term negative creep. When the applied stress had exceeded the critical value, the negative creep disappeared. Fibres traversing grain boundaries can reinforce and resist grain boundary sliding at elevated temperature. The effect of stress on creep rate for the composites is not so strong as that for unidirectional metallic matrix composites. During the creep, some intermetallic phases in the Al2O3/Al-5Si-3Cu-1 Mg composite were precipitated and most of them were segregated at grain boundaries, leading to a small increase of the creep rate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00376286
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  • 9
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    Pan-African events in Prydz Bay, East Antarctica, and their implications for East Gondwana tectonics (2003)
    In:  Geological Society Special Publication 206: 231-245.
    Details
    Publication Date: 2003-01-01
    Description: Decompression, anatexis and the clockwise granulite-grade P-T evolution of high-grade rocks of Prydz Bay reflect late collisional extension that occurred c. 530 Ma in the Prydz Belt. Rapid cooling of the mid-crust high-grade terranes of the Prydz Belt was achieved during c. 517-486 Ma by tectonically driven exhumation along dextral ductile shear zones in which late tectonic partialmelt bodies were emplaced. Instead of a model of polyphase metamorphism and deformation for the basement-and-cover sequences in Prydz Bay, we apply an accretionary one, i.e. an accretionary wedge with allochthonous blocks, to interpret the tectonic history in the Late Neoproterozoic of the Prydz Belt. SHRIMP U-Pb dates and Nd isotopic data available for both Prydz Bay and the Grove Mountains are used to explain amalgamation of the high-grade terranes in the Prydz Belt. This demonstrates that the assembly of the East Antarctic Craton was completed in the Pan-African event, and the East Antarctic Craton is a Pan-African-age collage rather than a keystone of East Gondwana during the Neoproterozoic.
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  • 10
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    Effect of hydrogenation on the ferromagnetism in polycrystalline Si1−xMnx:B thin films (2007)
    American Institute of Physics
    Details
    Publication Date: 2007-08-01
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
    Published by American Institute of Physics
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    PAPER CURRENT
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