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  • Electronic Resource  (23)
  • 1995-1999  (9)
  • 1970-1974  (12)
  • 1955-1959  (2)
  • 1
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 74 (1970), S. 2652-2659 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    The @journal of physical chemistry 〈Washington, DC〉 74 (1970), S. 2659-2666 
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Physics
    Type of Medium: Electronic Resource
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  • 3
    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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  • 4
    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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  • 5
    ISSN: 1471-4159
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Abstract— Human brain-specific alpha2-glycoprotein was purified by means of Sepharose immunoadsorbents. A further brain-specific protein was found by this method. This component appears to be present in brain in low concentrations only and has been enriched by affinity chromatography. Glial cells of human brain were separated from neurons by a density centrifugation method and four fractions were obtained: neuropil, neuronal perikarya, nuclei and debris. Each fraction was checked by light and phase contrast microscopy to estimate the intactness of the cells and any contamination by other fractions, and also immunologically for determination of brain-specific alpha2-glyco-protein. The results indicate that localization of this brain-specific protein is in the cyto-plasm of the glial cells. The results are discussed in terms of a possible role of this protein in the inflammatory response and in some demyelinating diseases.
    Type of Medium: Electronic Resource
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  • 6
    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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  • 7
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Anatomia, histologia, embryologia 2 (1973), S. 0 
    ISSN: 1439-0264
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: Die Gestalt der Uterindrüsen der Stute wird nadi Mazeration in Eisessig und nach Prepäration in Glycerin räumlich dargestellt. Ihr zyklusabhängiger Formenwandel sowie das für das Stutenendometrium charakteristische hohe Stratum subglandulare werden diskutiert. In einer vergleichenden Betrachtung wird die Drüsenhyperplasie im Postoestrum bei alien Haussäugetieren und beim Menschen herausgestellt. Bei der Maus liegt dagegen eine Drüsenhypertrophie im Oestrum vor.〈section xml:id="abs1-2"〉〈title type="main"〉SummaryCyclic changes in the shape of the mare's uterine glands compared with those of other mammals and manAfter maceration in glacial acetic acid and dissection under glycerin the shape of the mare's uterine glands is demonstrated three-dimensionally. Their changes in shape and size, related to the estrous cycle, and the thick subglandular layer, characteristic of the mare's endometrium, are discussed. Glandular hyperplasia occurs in the postestrous period in all domestic mammals and in man. In the mouse however there is glandular hypertrophy during estrus.〈section xml:id="abs1-3"〉〈title type="main"〉RésuméLes changements de forme cycliques des glandes utérines de la Jument, comparés à ceux des autres Mammifères et de l'HommeAprès macération dans l'acide acétique glacial et préparation dans la glycérine, la forme des glandes utérines de la Jument a été représentée dans l'espace. Leurs changements de forme, liés au cycle, ainsi que le Stratum subglandulare, élevé, caractéristique de l'endomètre de la Jument, sont discutés. Dans une étude comparée, l'hyperplasie glandulaire au Postoestrus est mise en évidence chez tous les Mammifères domestiques et chez l'Homme. Chez la Souris, par contre, c'est à l'Oestrus qu'on observe une hypertrophic glandulaire.〈section xml:id="abs1-4"〉〈title type="main"〉ResumenLos cambios ciclicos en la forma de las glándulas uterinas de la yegua en comparación con los de otros mamíferos y del hombreMediante la maceración en ácido acético glacial y la preparación en glicerina, se demuestran las glándulas uterinas en forma tridimensional. Se discute su cambio cíclico y su capa subglandular (Stratum subglandulare) característica para el endometrio de la yegua. Un estudio comparado de los animates domésticos y del hombre destaca la hiperplasia de las glándulas durante el postestro. En el ratón, al contrario, la hipertrofia glandular se encuentra durante el estro.
    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
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 239 (1970), S. 296-306 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung An männlichen und weiblichen Sprague-Dawley-Ratten wurden die mechanischen Eigenschaften der Haut in Abhängigkeit vom Körpergewicht untersucht. Es wurden die Hautdicke, die bis zum Abriß notwendige Kraft und die Reißfestigkeit geprüft. Für jeden Parameter wurde eine mathematische Analyse mit dem Analogrechner durchgeführt. Die Hautdicke zeigte eine lineare Abhängigkeit vom Körpergewicht. Geschlechtsunterschiede ließen sich an der Hautdicke nicht feststellen. Die Reißkraft und noch ausgeprägter die Reißfestigkeit zeigten in Abhängigkeit vom Körpergewicht einen mehrphasischen Verlauf, der in Differentialgleichungen erfaßt wurde. Geringe Unterschiede, die im Kurvenverlauf der Proben von männlichen und weiblichen Tieren in der Wachstumsphase festzustellen waren, sind auf das stärkere Wachstum der Männchen zu beziehen. Die Reißfestigkeit als Maß der Eigenschaften des kollagenen Materials zeigte ein deutliches Maximum im Alter von knapp 3 Monaten. Mit zunehmendem Alter war eine langsame Abnahme der Reißfestigkeit festzustellen. Ähnliche Befunde, wie sie an menschlicher Haut erhoben wurden, werden diskutiert.
    Notes: Summary Male and female rats of Sprague Dawley strain were used to study the mechanical properties of skin in correlation to body weight as an indicator for age. Groups of ten rats of each sex were used for each ten gram interval of body weight. Flaps of shaved skin of the back were prepared and the thickness of skin specimens was measured. Strips of 5 mm width were cut and fastened between clamps of the Instron®-instrument. The load resulting in rupture of the skin strip was measured and the tensile strength (load/cross section) was calculated. Each parameter was analysed mathematically with the analog computer. Skin thickness showed a linear correlation to body weight without differences depending on sex. When correlated to body weight, the graph of the load at rupture and even more pronounced the graph of the tensile strength revealed several phases which were expressed in the form of differential equations. During growth phase differences between male and female rats were noticed. These have to be attributed to a more intensive growth of male rats. Tensile strength of skin tissue showed a maximum in rats being about three months old. Further increase in body weight (or age) was correlated to a slow decrease in tensile strength. Similar results found in human skin were discussed.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    Springer
    Archives of dermatological research 239 (1971), S. 355-367 
    ISSN: 1432-069X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Aus dem Sektionsgut des Pathologischen Instituts der Universität Mainz wurden von 52 Patienten Hautproben untersucht, die in der Gegend des Sternums und an der Innenseite der Oberschenkel entnommen waren. Aus den Hautproben wurden 5 mm breite Streifen ausgestanzt und Kraft-Dehnungsdiagramme aufgenommen. Folgende Parameter wurden gemessen: Hautdicke (mm), Kraft bis zum Abriß (g), Reißfestigkeit (g/mm2), Dehnung bis zum Abriß (%), Anstiegssteilheit in linearen Teil des Kraft-Dehnungsdiagramms (g% Dehnung) und Elastizitätsmodul (g/mm2). Die Proben wurden in Altersklassen eingeteilt. Von sämtlichen Parametern konnte die Abhängigkeit vom Lebensalter mit Hilfe des Analog-Rechners durch 2 konkurrierende 3-Funktionen beschrieben werden. Im vorliegenden Material konnte keine Abhängikeit der Meßgrößen vom Geschlecht der Patienten gefunden werden. Auch eine Abhängigkeit von endokrinen Erkrankungen ließ sich statistisch nicht sichern. Die Abhängigkeit vom Lebensalter zeigte sich sowohl bei den Meßgrößen, die suf das Organ Haut zu beziehen sind, als auch bei den Parametern, die etwas über die Materialbeschaffenheit aussagen. Sämtliche Kurven durchliefen vom frühkindlichen Alter bis zum Senium ein mehr oder minder ausgeprägtes Maximum. Dieses lag bei der Hautdicke etwa um das 35. Lebensjahr, bei der Reißkraft um das 20. Lebensjahr sowie bei der Anstiegssteilheit um das 25. Lebensjahr. Die Maxima der Dehnung bis zum Abriß waren weniger ausgeprägt. Die Maxima der beiden auf die Materialeigenschaften zu beziehenden Parameter Reißfestigkeit und Elastizitätsmodul lagen auf einem noch etwas früheren Zeitpunkt, nämlich 14 bzw. 10 Jahre. Alle Meßgrößen fielen bis zum Senium wieder ab. Die aus früheren Arbeiten bekannten Beziehungen zur Kollagenreifung und zum Kollagenmetabolismus werden diskutiert.
    Notes: Summary Autopsy material was used to study the mechanical properties of human skin. The specimens had been taken from the area of the manubrium sterni and the inner side of the thigh. Strips of 5 mm width were cut and load-extension curves were registered using the Instron®-instrument. The following parameters were measured: thickness of the skin (mm), load resulting in rupture of the skin strip (g) tensile strength (g/mm2), extension resulting in rupture (%), steepness in the linear part of the load-extension curve (g/% extension) and elasticity module (g/mm2). For the evaluation of the results, the specimens were classified according to age. An analog computer was used; it was possible to describe the age-dependence of each parameter by two concurrent e-functions. No statistically significant dependence on sex could be found in any of the parameters under study. Neither could any significant influence of endocrine factors be established due to the inhomogenity of the material. The dependence upon age was manifest in the parameters which were related to the skin as an organ as well as in the parameters which were indicators of the quality of the material used. The curves which were correlated to age were calculated by the analog computer. Starting from early childhood and ending with senium each of them showed a maximum being more or less pronounced. When related to skin thickness this maximum appeared around the 35th year of life, load at rupture around the 20th year and steepness of the load-extension curve around the 25th year. The maxima of extension at rupture were less pronounced. The maxima of tensile strength and elasticity module, which parameters are indicators for the quality of the material used, appeared in an even earlier period of life, i.e. at the age of 14, and 10 years respectively. All parameters studied so far showed a decrease until senium. Correlations between mechanical properties of connective tissue and collagen metabolism known from earlier studies as well as similar results in animals are discussed.
    Type of Medium: Electronic Resource
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