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  • 1
    ISSN: 0044-2313
    Keywords: Tellurium ; niobium oxytrihalides ; hexatellurium(2+) ; tetrachlorooxoniobate (1-) ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: The Prismatic Te62+ Ion in the Structure of Te6(NbOCl4)2Te6(NbOCl4)2 is obtained from Te, TeCl4 and NbOCl3 at 200°C. It crystallizes triclinic, space group P1 (a = 915,5(4) pm, b = 1655,3(6) pm, c = 3134,4(9) pm, α = 42,62(2)°, β = 117,12(6)°, γ = 138,24(8)°). The crystal structure analysis shows, that the structure is built of one-dimensional polymeric ∞1[NbOCl4-] chains in which the monomers are linked via linear O—Nb—O-bridges and from discrete Te62+ polycations that are also arranged in strands, but without significant interactions. The structure is closley related but not isotypic to the previously reported tungsten containing analogue Te6(WOCl4)2 (monoclinic, P21/c). A comparison of the two structures shows that rotations of the cationic strands relative to the anionic strands lead to different cation-anion interactions.
    Notes: Te6(NbOCl4)2 wird aus Te, TeCl4 und NbOCl3 bei 200°C erhalten. Es kristallisiert triklin, P1, a = 915,5(4) pm, b = 1655,3(6) pm, c = 3134,4(9) pm, α = 42,62(2)°, β = 117,12(6)°, γ = 138,24(8)°. Die Kristallstrukturanalyse zeigt, daß die Struktur aus eindimensional-polymeren, über O-Atome verknüpften ∞1[NbOCl4-]-Strängen und aus diskreten, strangartig angeordneten Te62+-Polykationen aufgebaut ist. Die Struktur ist eng verwandt, aber nicht isotyp mit derjenigen der analogen wolframhaltigen Verbindung Te6(WOCl4)2 (monoklin, P21/c). Ein Strukturvergleich zeigt, daß Verdrehungen der Kationenstränge relativ zu den Anionensträngen zu unterschiedlichen Kation-Anionwechselwirkungen führen.
    Additional Material: 5 Ill.
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  • 2
    ISSN: 1573-1561
    Keywords: Lepidoptera ; Noctuidae ; Heliothis zea ; bioassay ; host plant resistance mechanisms ; allelochemicals
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract Maysin, a flavone glycoside from corn silks, inhibits ingestion, and thus growth, ofHeliothis zea (Boddie) larvae. Pinitol from soybeans inhibitedH. zea growth by the same mechanism. Despite the widely held assumption that tannins inhibit growth by inhibiting assimilation, cotton condensed tannin inhibitedH. zea growth by reducing ingestion; no evidence was found for a reduction in assimilation. Neonate larvae are shown to be much more sensitive to allelochemics than larvae that have fed on control diet before being transferred to diet containing plant allelochemics.
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  • 3
    ISSN: 1573-739X
    Keywords: Nabumetone ; Piroxicam ; osteoarthritis ; Randomized controlled trials ; Sickness Impact Profile ; Activities of daily living
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract There is some evidence that nabumetone (1000 mg once daily) in comparison with piroxicam (20 mg once daily) in patients with OA in general practice is associated with a lower incidence and less severe occurrence of stomach pain but with more withdrawals due to lack of efficacy. The aim of this analysis was to investigate whether these differences are reflected in health-related quality of life assessments. Patients (n=198) included in this study were selected in general practice according to a protocol. The patients were randomized and treated for a period of six weeks. Clinical assessments were performed by the general practitioner (GP) during treatment. The Sickness Impact Profile (SIP), the Activities of Daily Living (ADL), and a pain questionnaire were filled out by the patients before and after treatment. As measured with the SIP, the ADL and the pain questionnaire, there were no significant differences between nabumetone and piroxicam. The comelations between (changes in) patient assessments and (changes in) clinical assessments were low. The differences between the two drugs regarding withdrawals and adverse events were not reflected by patient health-related quality of life assessments. There was a low correlation between patient health-related quality of life assessment and clinical assessments. To get a complete picture of the efficacy and safety of a drug, patient health-related quality of life assessments should be a part of a clinical trial.
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  • 4
    ISSN: 1573-739X
    Keywords: Family practice ; Nabumetone ; Osteoarthritis ; Piroxicam ; Randomized controlled trials ; Side effects
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract To study nabumetone (1,000 mg once daily) by comparison with piroxicam (20 mg once daily) in patients with osteoarthritis, a randomized, double-blind trial was set up in 40 general practices. Evaluation was based on clinical outcome in 198 patients. There was some evidence that nabumetone is associated with a lower and less severe occurrence of gastric pain, and with more withdrawals due to lack of efficacy. Although the differences between nabumetone and piroxicam were small in this study, these were clinically relevant. The general practitioner should balance the respective benefits of greater safety and tolerance against greater efficacy in meeting the requirements of an individual patient with osteoarthritis.
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  • 5
    ISSN: 0044-2313
    Keywords: Tellurium ; niobium oxytrihalides ; poly(heptatellurium(2+)) ; tetrachlorooxoniobate (1-) ; tetrabromooxoniobate (1-) ; synthesis ; crystal structure ; Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Description / Table of Contents: Tellurium Cations stabilized by Niobium Oxytrihalides: Synthesis and Crystal Structure of Te7NbOBr5 and Te7NbOCl5The reaction of Te2Br with NbOBr3 in a sealed evacuated glass ampoule at 225°C yields Te7NbOBr5 in form of bright black needles. Te7NbOCl5 is obtained from tellurium, TeCl4 and NbOCl3 at 220°C. Both compounds crystallize orthorhombic in the space group Pcca (Te7NbOBr5: a = 2 651,9(4) pm, b = 836.6(1) pm, c = 794.6(1) pm; Te7NbOCl5: a = 2 597.7(5) pm, b = 805.1(1) pm, c = 791.2(1) pm). The crystal structure determinations show that Te7NbOBr5 and Te7NbOCl5 are built of one-dimensional polymeric tellurium cations, one-dimensional associated pyramidal NbOX4 groups (X = Cl, Br) and isolated halide anions. Magnetic properties of Te7NbOX5 were determined and confirm the expected diamagnetism. Te7NbOX5 can thus be formulated as ∞1[Te72+] ∞1[NbOX4-] (X-). The charge distribution in the structure type Te7MOX5 (M = W, Nb; X = Cl, Br) became clear by synthesis and characterisation of the two niobium containing compounds.
    Notes: Durch Reaktion von Te2Br mit NbOBr3 in einer evakuierten Glasampulle bei 225°C entsteht Te7NbOBr5 in Form von schwarzglänzenden, stäbchenförmigen Kristallen. Te7NbOCl5 wird aus Te, TeCl4 und NbOCl3 bei 220°C erhalten. Beide Verbindungen kristallisieren im orthorhombischen Kristallsystem in der Raumgruppe Pcca (Te7NbOBr5: a = 2 651,9(4) pm, b = 836,6(1) pm, c = 794,6(1) pm; Te7NbOCl5: a = 2 597,7(5) pm, b = 805,1(1) pm, c = 791,2(1) pm). Die Kristallstrukturanalysen zeigen, daß Te7NbOBr5 und Te7NbOCl5 aus eindimensionalen polymeren Tellur-Kationen, eindimensionalen Strängen von pyramidalen, über O-Atome assoziierten NbOX4-Einheiten und aus isolierten Halogenidionen aufgebaut sind. Magnetische Messungen bestätigen den erwarteten Diamagnetismus und zeigen, daß Nb in der formalen Oxidationsstufe + V vorliegt. Die ionische Schreibweise lautet daher ∞1[Te72+] ∞1[NbOX4-] (X-). Die Synthese und Charakterisierung der beiden niobhaltigen Vertreter klärt die Ladungsverteilung im Strukturtyp Te7MOX5 (M = W, Nb; X = Cl, Br).
    Additional Material: 4 Ill.
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  • 6
    ISSN: 1432-1203
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The M13 bacteriophage probe, which makes possible the establishment of DNA fingerprints, was used to study a phenotypically normal woman with a 46XY karyotype and her twin brother. Identical fingerprints and positive hybridzation with a series of Y-specific probes were obtained on blood samples from the siblings. DNA from a skin biopsy of the woman yielded a clearly different pattern and displayed no Y-specific hybridization, indicating that she is a spontaneous chimera. This study illustrates the use of DNA fingerprinting as a powerful and simple aid to the diagnosis of natural chimerism.
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  • 7
    Electronic Resource
    Electronic Resource
    Weinheim : Wiley-Blackwell
    ISSN: 0044-8249
    Keywords: Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 8
    ISSN: 0022-4731
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Tetrahedron Letters 19 (1978), S. 3327-3328 
    ISSN: 0040-4039
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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