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  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 72 (1968), S. 3098-3105 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Science Ltd
    European journal of soil science 49 (1998), S. 0 
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: We investigated the possibility of inferring effective hydraulic properties of soil from the structure of the pore space. The aim was to identify structural properties, which are essential for water flow, so that physical experiments may be replaced by direct morphological measurements. The pore structure was investigated in three dimensions by serial sections through impregnated samples. The complex geometry of pore space was quantified in terms of two characteristics: pore-size distribution and pore connectivity. Only pores larger than 0.04 mm were considered. The results were used as input parameters for a pore-scale network model. The main desorption branch of the soil-water characteristic and the corresponding hydraulic conductivity function of the network model were calculated by numerical simulation. The simulation results, which are exclusively based on morphological investigations, were compared with independently measured results from a multi-step outflow experiment. This approach was demonstrated for two centrasting soil materials: the A and B horizons of a silty agricultural soil. The simulations were close to the experimental data, except for the absolute values of the hydraulic conductivity. The pore-size distribution and pore connectivity govern the shape of hydraulic functions and the applied morphometric methods are suitable for predicting essential characteristics of hydraulic soil properties.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    European journal of soil science 48 (1997), S. 0 
    ISSN: 1365-2389
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences , Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: The geometry of pore space in soil is considered to be the key in understanding transport of water, gas and solute. However, a quantitative and explicit characterization, by means of a physical interpretation, is difficult because of the geometric complexity of soil structure.Pores larger than 40 μm within two soil horizons have been analysed morphologically on 3-dimensional digital representations of the pore space obtained by serial sections through impregnated specimens. The Euler-Poincaré characteristic has been determined as an index of connectivity in three dimensions. The pore connectivity is quantified as a function of the minimum pore diameter considered leading to a connectivity function of the pore space. Different pore size classes were distinguished using 3-dimensional erosion and dilation. The connectivity function turned out to differentiate between two soil materials. The pore space in an upper Ah horizon is intensely connected through pores between 40 and 100 μm, in contrast to the pore space in the AhBv beneath it. The morphological pore-size distributions were compared to the pore-size distribution obtained by water retention measurements. The discrepancy between these different methods corresponds to the expectation due to pore connectivity.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Analytical chemistry 34 (1962), S. 398-400 
    ISSN: 1520-6882
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Industrial & engineering chemistry 53 (1961), S. 461-463 
    ISSN: 1520-5045
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Palo Alto, Calif. : Annual Reviews
    Annual Review of Biochemistry 36 (1967), S. 519-538 
    ISSN: 0066-4154
    Source: Annual Reviews Electronic Back Volume Collection 1932-2001ff
    Topics: Chemistry and Pharmacology , Biology
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 108 (1998), S. 4496-4504 
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: Highly resolved (Δν〈100 MHz) UV-REMPI (ultraviolet-resonantly enhanced multiphoton ionization) spectra of different vibronic bands in the phenol–water complex are presented. The torsional splitting caused by the hindered rotation of the water moiety in the hydrogen-bonded system is investigated. An autocorrelation procedure reveals torsional subbands, a correlation automated rotational fitting (CARF) of the spectra yields the rotational constants: The analyzed vibrations are classified by the rotational constants of the corresponding vibronic band and the symmetry of the torsional state. The transition to the stretching vibration at 156 cm−1 excess energy is shown to consist of two different torsional transitions similar to the electronic origin. The torsional splitting in the origin band is 0.8491(2) cm−1 and that of the stretching vibration is 0.8915(3) cm−1, demonstrating a very small coupling between the stretching and the torsional motion. We assign the 121 cm−1 band as the negative parity component of the transition to the wagging vibration β2 while the band at 125 cm−1 is tentatively assigned as the positive parity component of the same band. The resulting large torsional splitting of −4.596(3) cm−1 points to a strong coupling to the torsional motion. The band at 95 cm−1 has only one torsional parity component within its rotational envelope. The observed large change of its rotational constants does not fit to the pattern of the other vibrations and the band is tentatively assigned as an overtone of the torsional vibration τ with positive parity. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Springer
    Polymer bulletin 40 (1998), S. 151-157 
    ISSN: 1436-2449
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Abstract. A bifacial topological template exhibiting metal-binding sites and thioalkane chains has been incorporated into self-assembled monolayers and immobilised on gold surfaces: These systems allow for the detection of external ligands by SPR spectroscopy representing a first step in developing biosensors based on the TASP (Template Assembled Synthetic Proteins) concept.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-2307
    Keywords: Liver Damage ; Laxatives ; Phenolisatine ; Cholangiohepatitis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 36 weiblichen Patienten mit anamnestisch bekannter Einnahme von Laxantien wurden nach Exposition mit phenolisatinhaltigen Präparaten semiquantitative histologische Untersuchungen an laparoskopisch gewonnenen Leberpunktionszylindern unternommen. Der zeitliche Abstand zur Exposition betrug 12–24 Std (16 Fälle), 48 Std (8 Eälle), 72–96 Std (4 Fälle) und 7–14 Tage (4 Fälle). Histologisch entwickelt sich nach der Exposition eine akute Cholangiolitis vom allergisch-hyperergischen Typ mit Ödem und dichter eosinophiler Infiltration der Portalfelder, mit Destruktion des Epithels von präformierten Gallengängen und portal proliferierter Ductuli. Das Leberparenchym zeigt ein Zellödem und spärliche disseminierte acidophile Einzelzellnekrosen und Nekrobiosen. Der akute Prozeß ist bereits nach 8 Tagen weitgehend abgeklungen. Daneben bestehen bei der Mehrzahl der Fälle histologische Zeichen einer aggressiven chronischen Hepatitis vom Typ IIa, teils im aktiven Stadium mit Mottenfraßnekrosen, teils stabilisiert oder in Abheilung begriffen. Der Übergang in das Bild einer hepatitischen Cirrhose ist möglich. Gleiche Befunde bieten 31 bioptische Untersuchungen aus demselben Patientengut, wobei die akute eholangiolitische Exacerbation auf eine Eigenexposition der Patienten zurückzuführen ist. Das Krankheitsbild der Phenolisa-tinschädigung ist in seiner Gesamtheit medikamentös induziert und als rezidivierende chronische Cholangiohepatitis zu bezeichnen. Nach Weglassen des Medikamentes bildet sich das morphologische Substrat unter Hinterlassung einer inaktiven Fibrose bzw. Cirrhose zurück.
    Notes: Summary In the case of 36 female patients who were anamnestically known to have taken laxatives, semiquantitative histological investigations with laparoscopically obtained liver needle biopsies were effected after the exposition with preparations containing phenolisatine. The time gap until exposition was 12 to 24 h (16 cases), 48 h (8 cases), 72 to 96 h (4 cases) and 7 to 14 days (4 cases). The histological result after the exposition is an acute cholangiolitis of the allergic-hyper-ergic type with edema and a dense eosinophile infiltration of the portal fields with destruction of the epithelium of preformed bile ducts and portally proliferated ductles. In addition, the parenchyma of the liver shows a pleomorphism of the cells in form and colour with a cellular edema and with disseminated acidophilic necroses and necrobioses of the individual cells as well as with little reactive proliferation of the Kupffer's cell. After a period of 8 days the acute process has more or less subsided. Also, in the majority of cases there are histological signs of an aggressive chronic hepatitis of type IIa, partially in the active stage with piece-meal necroses and partially stabilized or in the process of healing. A transition to the picture of hepatitic cirrhosis is possible. In serious cases the picture of a chronic non-purulent destructive cholangitis can be simulated by the hepatocellular and canalicular damage. Thirty-one bioptic pre-examinations from the same group of patients show the same results, whereby the acute cholangiolitical exacerbation can be attributed to an exposition of the patients themselves. The clinical picture of the phenolisatine damage in its entirety is induced by medication and is described as a recurrent chronic Cholangiohepatitis. Similarities exist between the liver damages caused by chlorpromazine and arsphenamine. When medication is discontinued, the morphologic substrate recedes leaving behind an inactive fibrosis or cirrhosis. The formal and known causal pathogenetic connections are discussed with regard to this clinically important liver disease. Guidelines are then given for histological diagnosis of this damage caused by medication. 14% of the female patients with a histological picture of aggressive chronic hepatitis and hepatitic cirrhosis are affected by this type of liver damage.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archive for mathematical logic 19 (1978), S. 165-173 
    ISSN: 1432-0665
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mathematics
    Type of Medium: Electronic Resource
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