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  • Articles: DFG German National Licenses  (16)
  • Electronic Resource  (16)
  • 11
    Electronic Resource
    Electronic Resource
    A novel procedure for evaluating gingival perfusion status using laser-Doppler flowmetry (2005)
    Oxford, UK : Munksgaard International Publishers
    Journal of clinical periodontology 32 (2005), S. 0 
    Details
    ISSN: 1600-051X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Objectives: To systematize a procedure that allows one to characterize the perfusion response pattern of attached gingiva to the topical and transitory compression of alveolar mucose, using laser-Doppler flowmetry.Material and methods: A cross-sectional study was carried out, in 20 healthy adult subjects of either sex, with teeth in antero-mandibular sextant but without periodontitis at the lower left lateral incisor (LLLI). Sample was selected by convenience non-probability sampling. Gingival perfusion was evaluated at labial LLLI attached gingiva using a specially designed gingival tray. Two perfusion recordings were carried out 5 min. apart, each one consisting of a 40 s control phase, a 22 s compression phase and a 40 s post-compression phase. During compression phase, LLLI alveolar mucose was compressed with a wood-mounted cotton swab until the perfusion decreased to about 1/5 of its control perfusion value.Results: Integrated primary basal flow (IPBF) during control phase was of 14,210±1075 perfusion units (PU), whereas integrated flow during compression phase was of 1651±202 PU (p〈0.05). After compression was released, integrated total secondary real flow was 13,322±1513 PU (p〈0.05) which represented a 91.3±3.8% of IPBF. Gingival compression propitiated an induced flow debt (IFD) of 6478±781 PU, which increased in 980±482 PU after compression was released, representing 18% of the IFD (Debt index).Conclusions: A hypoaemic response in reaction to topical and transitory LLLI alveolar mucose compression was observed. Debt index and the ITSRF% are reproducible indices of microvascular perfusion response whose validation under pathological circumstances remains to be evaluated.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1600-051X.2005.00655.x
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  • 12
    Electronic Resource
    Electronic Resource
    Kinetics of the anation reaction of pentaamineaquacobalt(III) by phosphorous acid/hydrogenphosphite (1984)
    Springer
    Transition metal chemistry 9 (1984), S. 395-397 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary The kinetics of the anation reaction of [Co(NH3)5H2O]3+ by H3PO3/H2PO 3 − , to give [CoH2PO3(NH3)5]2+, have been studied at 60, 70 and 80°C, in the acidity range [H+](M)=1.5 · 10−1 −2.0 · 10−3. Only H2PO3 is found to be reactive. The rate data is consistent with an Id mechanism. The mean value of outer sphere association of [Co(NH3)H2O]3+ with H2PO 3 − is 1.5 M−1. Values of the interchange constants are: 1044ki(s−1)= 0.29, 1.47, 5.13, at 60, 70 and 80 °C respectively (ΔH≠= 1.4 · 102KJmol−1, ΔS≠=8.3 · 10 JK−1 mol−1). The first acidity constant of H3PO3 at I=1.0 has also been determined: 102Ka(M)=4.8, 5.2 and 5.5, at 25, 40 and 50 °C respectively.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00637027
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  • 13
    Electronic Resource
    Electronic Resource
    Hydrogen transfer reactions catalyzed by neutral rhodium(I) Schiff base complexes (1984)
    Springer
    Transition metal chemistry 9 (1984), S. 106-108 
    Details
    ISSN: 1572-901X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary Hydrogen transfer reactions from 2-propanol to acetophenone or cyclohexene are catalyzed by neutral rhodium(I) complexes of the type [Rh(COD)L] and [Rh2(COD)2L′] (where L and L′ are Schiff base ligands and COD=cycloocta-1,5-diene). Some dependency of the catalytic activity on the electronic and steric properties of the ligands are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00618586
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  • 14
    Electronic Resource
    Electronic Resource
    Synthesis and properties of stereoregular poly(ester amides) derived from carbohydrates (1998)
    Bognor Regis [u.a.] : Wiley-Blackwell
    Journal of Polymer Science Part A: Polymer Chemistry 36 (1998), S. 67-77 
    Details
    ISSN: 0887-624X
    Keywords: stereoregular poly(ester amides) ; carbohydrate-based polymers ; polycondensation reactions ; chiral polymers ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Two poly(ester amides) containing three methoxy groups stereoregularly attached to the main chain have been prepared by using naturally occurring L-arabinose and D-xylose as the starting materials. The polymers were prepared by the active ester polycondensation method and characterized by elemental analysis, IR, and 1H- and 13C-NMR spectroscopies. Both viscosimetry and GPC were used to estimate the molecular weights. The polymers are hydrophilic, one of them being water soluble, and exhibited moderate optical activity. Thermal and X-ray diffraction studies revealed that they are slightly crystalline and stable up to 250°C under nitrogen. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 67-77, 1998
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 15
    Electronic Resource
    Electronic Resource
    Mechanisms of Cyclopalladation Reactions in Acetic Acid: Not So Simple One-Pot Processes (2000)
    Weinheim : Wiley-Blackwell
    Berichte der deutschen chemischen Gesellschaft 2000 (2000), S. 217-224 
    Details
    ISSN: 1434-1948
    Keywords: Reaction mechanisms ; Cyclopalladation ; Acetic acid ; Pd-C bond stability ; Polynuclear species ; Palladium ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: The processes operating during the synthetic cyclopalladation reactions of imines in acetic acid have been studied from a kinetico-mechanistic point of view. These reactions include a fast initial coordination to the palladium through the N-donor atom of the imine, followed by the proper C-H bond activation to produce the acetato bridged dimeric species. At this point, the lability of the bridging acetato groups, the hydrolysis of the C-Pd bonds, and/or the hydrolysis of C=N exo bonds contribute to the generation of dark red polynuclear compounds. The processes occurring after the C-H activation have been followed kinetically, both from palladium acetate plus imine, and the synthetically pure isolated acetato dimers as starting materials. The kinetic and activation parameters have been found identical within experimental error whatever the starting material was (k323 = 1.5 × 10-4 s-1; ΔH# = 51 kJ mol-1; ΔS# = -163 JK-1 mol-1 ΔV# = +19 cm3 mol-1 for the 4-ClC6H4-CH=N-CH2-C6H5 imine derivative 1a). Acidolysis of C-Pd bonds has been found to occur in these polynuclear species. When alternative monomeric Cbenzylic-Pd bond-containing complexes are possible follow ups of the reactions produce them as final dead-end complexes (k323 = 2.2 × 10-5 s-1; ΔH# = 61 kJ mol-1; ΔS# = JK-1 mol-1 ΔV# ≈ 0 cm3 cm-1 for the [2,4,6-(CH3)3]C6H2-CH=N-CH2-[2-(CH3]C6[H4] imine derivative 3d). The same study has been carried out with primary amines in order to check the validity of the data if C=N bond hydrolysis is taking place in the imine derivatives with exo C=N bonds. For complexes with similar type of metallacycles, the results agree reasonably well with the proposed mechanism [k323 = 1.2·10-4 s-1, ΔH# = 46 kJ·mol-1, ΔS# = -180 J·K-1mol-1, ΔV# = -16 cm3·mol-1 for the polynuclear formation of the C6H5-CH2-NH2 derivative 4e; k323 = 3.0·10-4 s-1, ΔH# = 55 kJ·mol-1, ΔS
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
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    Paper (German National Licenses)
  • 16
    Electronic Resource
    Electronic Resource
    Quantitative morphological changes in neurons and glia in the frontal lobe of the aging rat (1993)
    New York, NY [u.a.] : Wiley-Blackwell
    The @Anatomical Record 237 (1993), S. 104-108 
    Details
    ISSN: 0003-276X
    Keywords: Neuronal density ; Glial density ; Cytomorphometry ; Old ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Medicine
    Notes: The quantitative morphological changes in neurons and glia during the aging process were analyzed in the different cortical layers, grouped as I, II-IV, V, and VI, of the frontal cortex of the rat. The parameters analyzed were cortical volume, neuronal density, glial density, and neuronal soma and nucleus areas. No changes with age were found in the volume of the layers, in neuronal density (with the exception of layer I), or in the area of the neuronal soma. However, older animals showed a 10 to 20% increase in glial density, depending on the layer studied. In addition, there was an age-related decrease in the area of the neuronal nucleus in layers II-IV, V, and VI. These results support the idea that the aging frontal cortex undergoes structural changes that may be involved in the morphological basis of memory and cognitive impairments characteristic of aging. © 1993 Wiley-Liss, Inc.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ar.1092370110
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