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  • 1
    Electronic Resource
    Electronic Resource
    Crystal and molecular structure of [Rh(μ-SBut)(CO)(PPh3)]2 (1986)
    Springer
    Journal of chemical crystallography 16 (1986), S. 577-584 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Reaction of [Rh(CO)2Cl]2 with Bu t SLi followed by refluxing with PPh3 yields [Rh(μ-SBu t )(CO)(PPh3)]2(1). The structure of (1) has been determined by X-ray crystallography. Empirical formula: Rh2P2S2C46H48O2,M=964.78, triclinic, P¯1,a=11.408(9),b=13.241(8),c=15.830(3) Å,α=93.67(3),β=93.12(5),γ=110.8(6)°,Z=2,D calc=1.44 g cm−3,R=0.048 (R w =0.062) for 5939 observed reflections. In the solid state, the compound exhibitscis geometry with respect to the phosphine and CO ligands. The geometry about the two metals is essentially square planar, with a dihedral angle of 103.2°, and a “butterfly angle” of 102.3°. Compound (1) is stereochemically rigid on the NMR time scale from −80 to +80°C.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01161045
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  • 2
    Electronic Resource
    Electronic Resource
    Synthesis and crystal structure of [CrCl3(dmpe)]2(μ-dmpe)·2(CH2Cl2): A diphosphine ligand bridging two isolated Cr(III) centers (1986)
    Springer
    Journal of chemical crystallography 16 (1986), S. 673-679 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract Reaction of dmpe (bis(1,2-dimethylphosphino)ethane) with CrCl3(THF)3 gives deep red crystalline Cr2(dmpe)3(Cl)6·2CH2Cl2 in 85% yield. The X-ray crystal structure of the title compound shows a bridgingtrans dmpe ligand between two isolated Cr(III) centers. Each Cr(III) atom bears a chelating dmpe group and three Cl atoms in a roughly octahedral geometry. Crystal data: C20H48Cl10Cr2P6,M=933.0, monoclinic,P21/n,a=9.221(3),b=10.587(2),c=21.868(2) Å,β=98.962(3)°,D calc=1.47 g cm−3,Z=2. FinalR=0.054,R w =0.063 from 1964 observed reflections (I〉3σ(I)), 3489 measured.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01181250
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  • 3
    Electronic Resource
    Electronic Resource
    Structure of chlorotristrimethylphosphine cobalt(I), C9H27ClCoP3 (1983)
    Springer
    Journal of chemical crystallography 13 (1983), S. 273-278 
    Details
    ISSN: 1572-8854
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract The crystal structure of CoCl(PMes3)3 has shown that the compound is not isostructural with its rhodium analogue. The title compound crystallizes in the cubic space groupPa 3 (No. 205) whereas the analogous Rh compound belongs to the triclinic space groupP ¯1. The cobalt derivative exhibits unit cell constanta=15.490(7) Å andZ=8 forDc=1.15 g cm−3. Full-matrix least-squares refinement gave a finalR value of 0.055 for 283 observed reflections. The Co-Cl bond in the molecule lies along a crystallographic three-fold axis with a Co-Cl distance of 2.21(1) Å. The unique Co-P distance is 2.240(6) Å.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01158907
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  • 4
    Electronic Resource
    Electronic Resource
    RAPD markers for constructing intraspecific tomato genetic maps (1993)
    Springer
    Plant cell reports 12 (1993), S. 293-297 
    Details
    ISSN: 1432-203X
    Keywords: Lycopersicon esculentum ; Genetic marker ; Intraspecific genetic map ; DNA polymorphism ; Isozyme ; RFLP ; RAPD
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The existing molecular genetic maps of the tomato, Lycopersicon spp, are constructed based on isozyme and RFLP polymorphisms between tomato species. These maps are useful for certain applications but have few markers that exhibit sufficient polymorphisms for intraspecific analysis and manipulations within the cultivated tomato. The purpose of this study was to investigate the relative potential of RAPD technology, as compared to isozymes and RFLPs, to generate polymorphic DNA markers within cultivated tomatoes. Sixteen isozymes and 25 RFLP clones that were known to detect polymorphism between L. esculentum and L. pennellii, and 313 random oligonucleotide primers were examined. None of the isozymes and only four of the RFLP clones (i.e., 16%) revealed polymorphism between the cultivated varieties whereas up to 63% of the RAPD primers detected one or more polymorphic DNA fragments between these varieties. All RAPD primers detected polymorphism between L. esculentum and L. pennellii genotypes. These results clearly indicate that RAPD technology can generate sufficient genetic markers exploiting sequence differences within cultivated tomatoes to facilitate construction of intraspecific genetic maps.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00237139
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  • 5
    Electronic Resource
    Electronic Resource
    Effects of floury-2 locus on zein accumulation and RNA metabolism during maize endosperm development (1978)
    Springer
    Biochemical genetics 16 (1978), S. 27-38 
    Details
    ISSN: 1573-4927
    Keywords: Zea mays ; floury-2 ; polysomes ; zein synthesis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Zein accumulation patterns during mutant and normal maize endosperm development were determined. Accompanying an increase in the number of floury-2 alleles present in the endosperm was a well-defined stepwise depression in zein accumulation. Analysis of the zein accumulated in endosperms containing zero, one, two, and three doses of the floury-2 allele by sodium dodecylsulfate-polyacrylamide gel electrophoresis revealed a proportionate reduction in the two major zein components, Z1 and Z2. In contrast, the relative proportions of the minor zein bands were altered. Membrane-bound polysomes isolated from kernels of floury-2 and normal maize were predominantly large size classes. The presence of increasing numbers of the floury-2 allele in the endosperm decreased recovery of membrane-bound polysomal material in a stepwise fashion. However, major alterations in polysome size-class distributions were not observed. The reduction in membrane-bound polysome material correlated linearly with reductions in in vitro zein synthesis and in vivo zein accumulation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00484382
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of O2 stress on tomato alcohol dehydrogenase activity: Description of a second ADH coding gene (1981)
    Springer
    Biochemical genetics 19 (1981), S. 397-409 
    Details
    ISSN: 1573-4927
    Keywords: Lycopersicon ; anaerobic induction ; Adh-2 ; linkage
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Subjecting tomato seedlings to anaerobic conditions results in expression of a previously undescribed Adh gene, Adh-2. Induction profiles were similar for all tissues, including roots, hypocotyls, cotyledons, and true leaves. In sharp contrast to ADH-1, ADH-2 showed no induction under anaerobic stress. The only time ADH-2 activity was expressed (under noninduced conditions) was during the early stages of embryogenesis. By late embryogenesis, ADH-2 activity approached a zero level, concomitant with a sharp rise in ADH-1 activity, which is found in the cotyledons of quiescent embryo. Despite striking differences in the regulation of these two genes, their homology is demonstrated in the ability of their enzyme subunits to form presumed intergenic heterodimers, which are visible during the transient period of embryogenesis when the polypeptides encoded by both genes are expressed. A multiple point linkage test using isozymic marker genes places the Adh-2 locus on chromosome 6 near Aps-1, whereas Adh-1 resides on chromosome 4.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00504283
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  • 7
    Electronic Resource
    Electronic Resource
    Prevention of salt-induced epinasty by α-aminooxyacetic acid and cobalt (1989)
    Springer
    Plant growth regulation 8 (1989), S. 315-323 
    Details
    ISSN: 1573-5087
    Keywords: ethylene ; salinity stress ; epinastic growth ; α-aminooxyacetic acid ; 1-aminocyclopropane-1-carboxylic acid ; Lycopersicon esculentum
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Abstract Ethylene production in leaf petiole and laminae tissues was stimulated in tomato (Lycopersicon esculentum Mill. cv. UCT5) plants exposed to salinity-stress. At the highest salinity level (250 mM NaCl), rates of ethylene production more than doubled over those observed in non-stressed plants. Correspondingly, petiolar epinasty increased with increasing levels of stress impositions. Both responses were suppressed when either 1 mM α-aminooxyacetic acid (AOA), or 100 μM Co2+ was simultaneously applied. Co2+, but not AOA, had a pronounced effect on ethylene production resulting from the application of a saturating dose (2 mM) of 1-aminocyclopropane-1-carboxylic acid (ACC), the immediate precursor of ethylene. This result suggests that ethylene production is dependent upon the activity of ethylene forming enzyme (EFE). The magnitude of ethylene stimulation in leaf petioles was related to the salinity level imposed and to the induction of petiole epinasty. In the absence of stress impositions, epinastic responsiveness to ethylene or its precursor, ACC, might provide a simple, indirect criteria to adjudge salt-sensitivity among plants.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00024662
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  • 8
    Electronic Resource
    Electronic Resource
    A simulator for teaching MR image contrast behavior (1994)
    Springer
    Magnetic resonance materials in physics, biology and medicine 2 (1994), S. 515-522 
    Details
    ISSN: 1352-8661
    Keywords: MRI ; continuing education ; training ; computer simulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine , Physics
    Notes: Abstract A computer program to create magnetic resonance images simulating the main features of a magnetic resonance imaging (MR) machine was developed on a personal computer. The simulated MR images are calculated using the relevant equations describing a chosen pulse sequence on the basis of proton density,T 1 andT 2 images acquired from whole-body MR equipment. The imaging parameters (i.e., TR, TE, TI, etc.) are provided by the user. This program produces highly realistic simulated images and includes features such as choice of echo time, inversion time, repetition time and flip angle, as well as standard features of image display programs such as setting of window level/width, zooming and region of interest definition. A novel additional feature is the ability to define artificial pathologies in user-defined areas by specifying changes in the relaxation times and proton density. The simulator has been developed for teaching and training purposes. A prototype version has been used for teaching MRI with extremely positive reactions from students.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01766086
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  • 9
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    Effects of floury-2 locus on zein accumulation and RNA metabolism during maize endosperm development (1978)
    Springer
    Details
    Publication Date: 1978-02-01
    Print ISSN: 0006-2928
    Electronic ISSN: 1573-4927
    Topics: Biology , Chemistry and Pharmacology
    Published by Springer
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  • 10
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    Effects of O2 stress on tomato alcohol dehydrogenase activity: Description of a second ADH coding gene (1981)
    Springer
    Details
    Publication Date: 1981-04-01
    Print ISSN: 0006-2928
    Electronic ISSN: 1573-4927
    Topics: Biology , Chemistry and Pharmacology
    Published by Springer
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