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  • Chemistry  (83)
  • Physics  (4)
  • Industrial Chemistry  (3)
  • Greater omentum  (2)
  • Action Programme  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Bundesgesundheitsblatt, Gesundheitsforschung, Gesundheitsschutz 43 (2000), S. 323-327 
    ISSN: 1437-1588
    Keywords: Schlüsselwörter Umwelt und Gesundheit ; Aktionsprogramm ; Umweltmedizin ; Risikomanagement gesundheitsbezogene Umweltqualitätsziele ; Keywords Environment and Health ; Action Programme ; Environmental Medicine ; Risk Management ; Health Related Environmental Quality Objectives
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Abstract In fulfilling the commitment to the European Conferences on Environmental Health the Federal Ministry for Health and the Federal Ministry for the Environment, Nature Conservation and Nuclear Safety presented a joint “Action Programme on Environment and Health”. The action programme is backed up by a comprehensive documentation presenting the current status and findings and providing justification for the proposed goals and measures. The programme covers the following subjects: environment health monitoring and reporting, information management, risk perception and risk acceptance, environmental medicine, measures to improve co-operation among competent national authorities, international co-operation. The programme also conveys media- and substance-oriented quality objectives, in particular concerning outdoor air and climate; indoor air; water resources, soil, food; ionising radiation; noise; substances and preparations. The programme is aimed at supporting the policy development in the field of environment and health. The planing of detailed steps and the programme's implementation will be performed in close co-ordination and co-operation of all parties interested/involved and afflicted/affected.
    Notes: Zusammenfassung Das gemeinsame Aktionsprogramm “Umwelt und Gesundheit” des Ministeriums für Gesundheit und des Ministeriums für Umwelt, Naturschutz und Reaktorsicherheit löst die eingegangene Verpflichtung ein, die aus den europäischen Umweltkonferenzen resultiert. Das Programm dient dem Ziel, eine Handlungsbasis aufzustellen, auf welcher der Gesundheitszustand der Bürger und Bürgerinnen in Bereichen sichergestellt wird, die durch ungünstige Einflüsse von Umweltnoxen physikalischer Natur, mediengetragenen Umweltnoxen oder durch Aufnahme beim Umgang mit Verbraucherprodukten des täglichen Bedarfs oder durch die Nahrung gefährdet sein können. Das Programm wurde auf dem Hintergrund eines ausführlichen Dokumentationsbandes erstellt, der den aktuellen Sach- und Erkenntnisstand ausführlich darstellt und damit die vorgeschlagenen Ziele und Maßnahmen inhaltlich begründet. Das Programm enthält folgende Themen: umweltbezogene Gesundheitsbeobachtung und -berichterstattung, Informationsmanagement, Umgang mit Risiken, Umweltmedizin, Verbesserung der bestehenden Behördenstrukturen und internationale Zusammenarbeit. Das Programm enthält zudem verschiedene medien- und stoffbezogene Qualitätsziele zu folgenden Themen: Außenluft und Klima; Innenraumluft; Wasserressourcen, Boden, Lebensmittel, ionisierende Strahlung; Lärm sowie Stoffe und Zubereitungen. Das Programm soll eine Arbeitsgrundlage für die weitere Entwicklung des Politikfeldes Umwelt und Gesundheit bilden. Die weitere Ausgestaltung um Umsetzung des Programms wird in intensivem Diskurs mit allen Beteiligten und Betroffenen erfolgen.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1435-2451
    Keywords: Greater omentum ; Mesothelial cells ; Electron microscopy ; Alterations through surgical treatment
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Bei 5 Patienten der Abteilung für Allgemeinchirurgie der Universitdtsklinik Hamburg-Eppendorf, die wegen unterschiedlicher Indikationen laparotomiert wurden, konnten intraoperativ Gewebsstücke des großen Netzes entnommen werden. Die Oberflächenmorphologie des großen Netzes wurde mit dem Licht-, Transmissionselektronen- und Rasterelektronenmikroskop untersucht. Es zeigt sich, daß man bei der Entnahme des Materials äußerst vorsichtig sein muß, um unverletztes Gewebe zu erhalten. Daraus folgt, daß bei normaler chirurgischer Manipulation am großen Netz Verletzungen auftreten. An unverletzten Gewebsstücken wird die normale Oberfläche des großen Netzes beim Menschen beschrieben, wobei die Befunde früherer Arbeiten grundsätzlich bestätigt werden. Die Schädigungen an der Oberfläche des großen Netzes sind nach chirurgischen Manipulationen aber weitaus stärker, als man mit bloßem Auge wahrnehmen kann. Man findet Abhebungen der Mesothelzellen, Zerreißungen der submesothelialen Bindegewebsstrukturen, Quetschungen der Fettzellen und Zerreißungen der Blutgefäße. Dabei werden Lipidtropfen in das submesotheliale Bindegewebe gequetscht oder sogar auf die Oberfläche des Mesothels gedrückt. Erythrocyten liegen massenhaft im Interstitium zwischen den Fettzellen. Inwieweit Milchflecken und freie Nervenendigungen an der Oberfläche des großen Netzes durch intraoperative Manipulationen geschädigt werden, ist anhand unseres Materials nicht sicher zu beurteilen.
    Notes: Summary From five patients of the Department of General Surgery of the University Hospital of Hamburg-Eppendorf, who underwent laparotomy because of different indications, small pieces of tissue of the greater omentum were taken intraoperatively. The surface morphology of the greater omentum was studied by means of light, transmission electron and scanning electron microscopy. It became obvious that intact tissue only was obtained when the procedure of taking out material was accomplished most carefully. Consequently, during normal surgical manipulations the greater omentum usually will be damaged. In undamaged tissue specimen the normal surface of the greater omentum in man is described. The findings basically confirm the results of previous investigations. Injuries at the surface of the greater omentum after surgical treatment are, however, much more severe than they are noticeable by the naked eye. Lifting up of the mesothelium, ruptures of the submesothelial structures of connective tissue, squashing of fat cells and ruptures of blood vessels can be observed. During these processes lipid droplets are squeezed into the submesothelial connective tissues or even pressed up to the surface of the mesothelium. Large quantities of erythrocytes are found in the interstitium in between the adipose cells. To what extent milky spots and free nerve endings at the surface of the greater omentum are damaged during intraoperative manipulations cannot be unequivocally estimated on the basis of the material studied here.
    Type of Medium: Electronic Resource
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  • 3
    ISSN: 1435-2451
    Keywords: Greater omentum ; Anatomical functional structures ; Großes Netz ; Anatomische Funktionsstruktur
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Die Studie befaßt sich mit der klinisch relevanten morphologischen Struktur des großen Netzes. Die Verletzlichkeit des Mesothels bei intraoperativer mechanischer Traumatisierung wird lichtmikroskopisch und rasterelektronenmikroskopisch dargestellt. Zu erheblichen Parenchymschäden des großen Netzes kommt es durch das Abschieben von Mesothellappen, das Zerreißen von Bindegewebsstrukturen und das Zerquetschen von Fettzellen; dabei können Lipidmassen in das Interstitium zwischen den Fettzellen und in die submesotheliale Bindegewebsschicht gedrückt werden. Die sog. Aktionsfläche des Netzes scheint zunächst die Unterfläche zu sein.
    Notes: Summary The study deals with clinically relevant morphological structures of the greater omentum. The vulnerability of the mesothelioma during intraoperative mechanical traumatization is shown with light-microscopic and grid electron-microscopic pictures. Important damage to the parenchyma of the greater omentum happens through shoving off the mesothelial layer, rupture of connective tissue structures, and the crushing of fat cells. In this way, the fat mass is pressed into the interstice between the fat cells and into the submesothelial connective tissue. The first action area of the omentum seems to be the dorsal layer.
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 33 (1993), S. 377-382 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The viscoelastic responses of some molten polymers, and particularly of low density polyethylene (LDPE), are known to vary with processing history. Reasons for the variations include the effects of shear history on morphological states of the polymer, or on its molecular weight parameters. A typical low density polyethylene has been used to test the shear-history dependence concept following a variety of processing steps. The polymer was sheared in single-screw and twin-screw extruders, and in a high speed melter / mixer (Gelimat). Samples also were precipitated from very dilute solutions in trichlorobenzene and in p-xylene. GPC analyses showed that, in general, these procedures did not affect the various moments of molecular weight. An exception was the Gelimat-mixed sample, for which mild reductions in Mn and Mw were noted. In contrast, melt viscosity and elasticity readings, the former from low shear evaluations and the latter from extrudate swelling, were affected by the various procedures. A drop in melt viscosity and in elasticity was observed, being most pronounced for precipitated and twin-screw extruded versions of the LDPE. Reductions also were observed in the specimen sheared in the Gelimat instrument. Following conditioning at the test extrusion temperature (170°C), viscous and elastic responses tended to revert to those of the unsheared control sample, the exception again being the sample sheared in the Gelimat melter / mixer. Of the various mechanisms proposed in the literature to account for transient property changes such as those reported, temporary changes in the degree of chain entanglement appear the most satisfactory explanation. Irreversible alterations in viscoelastic properties may be associated with changes in molecular weights due to processing at high shear.
    Additional Material: 2 Ill.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 34 (1994), S. 981-985 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Compounds based on poly(vinyl chloride) (PVC), and containing CaCO3 filler and trifunctional acrylic crosslinking agent have been crosslinked by exposure to γ-rays at dosages to 70 kGy. The crosslinking agent was found to be essential for crosslinking to proceed, only minor sensitivity to the irradiation having been found in compounds omitting the chemical. The presence of filler somewhat inhibits crosslink effectiveness, as measured by solvent uptake data. Elastic moduli and elongations at rupture respond to crosslinking processes, the latter being particularly sensitive to the effects of irradiation. The presence of filler was found to raise modulus, while ductilities of compounds were greater than expected, owing to adhesion at polymer/filler interfaces. Favorable acid/base interaction forces appear responsible for the effect. The reduced sensitivity of filled PVC compounds to γ-ray exposure is attributed to polymer immobilization, the consequence of strong interfacial bonding with the filler.
    Additional Material: 6 Ill.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 263-269 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The dispersion of variously surface-treated CaCo3 fillers in linear low density polyethylene has been studied, along with mechanical properties of the filled compounds. Microwave plasma discharges were used to modify the filler surfaces. Inverse gas chromatographic analyses showed that plasma treatments could change the dispersive and non-dispersive components of filler surface characteristics. A reduction in these surface energies facilitated the dispersion of the filler in the non-polar polyethylene. Mechanical properties, particularly those at high deformation of the filled plastic, also responded to filler surface treatments, the ductility at failure increasing with a decrease in the filler's surface polarity. For any given elongation at failure, it was found that the amount of filler accommodated by the host polymer was raised by the appropriate surface modification procedure. The work illustrates the important contribution made by interfacial phenomena to various performance aspects of complex polymer systems.
    Additional Material: 8 Ill.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Stamford, Conn. [u.a.] : Wiley-Blackwell
    Polymer Engineering and Science 30 (1990), S. 950-956 
    ISSN: 0032-3888
    Keywords: Chemistry ; Chemical Engineering
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: The performance of a fluorocarbon elastomer processing additive in rutile-filled linear low density polyethylene (LLDPE) compounds was evaluated by capillary rheometry, and blown film extrusion. Different compounding sequences were considered and their effects on the performance of the processing additive in the presence of various rutiles examined. Lower apparent melt viscosities and higher shear rates for the onset of melt fracture were observed when using certain surface treated rutiles. The nature of the surface coating applied to rutiles was found to have a great influence on the Theological properties of the filled compounds and on the dispersibility of the solids. The acid-base characteristics of rutiles were determined by inverse gas chromatography techniques, and inherent agglomeration indexes for the pigments were measured by an application of powder rheology principles. It was found that those rutiles with high agglomeration indexes or those with highly basic surfaces interfered the most with the processing additive. Mechanisms by which rutile dispersibility and acid-base character influence the effectiveness of the fluorocarbon elastomer processing additive are discussed.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Journal of Polymer Science Part A-2: Polymer Physics 5 (1967), S. 555-568 
    ISSN: 0449-2978
    Keywords: Physics ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Physics
    Notes: A simple differential, isothermal calorimeter has been built to study the thermodynamics of interactions associated with a variety of polymer solution processes. The calorimeter is readily operated at temperatures ranging from ambient to about 200°C., temperature adjustments are rapid, and the apparatus is rugged enough to permit application to commercial process studies. Though less sensitive than microcalorimeters, it represents an attractive combination of satisfactory accuracy, speed, and flexibility of operation. The operation of the calorimeter is demonstrated by measurements of the heat of solution of sodium chloride in water and the heats of solution of various polyolefins in Tetralin and α-chloronaphthalene. The latter tend to confirm the presence of polymer aggregates in chloronaphthalene solutions below the thermodynamic melting temperature of the polymer.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 9
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 11 (1967), S. 1043-1053 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: Time dependence in the melt indexing of polyolefins stabilized against thermally induced changes is well known, the prevalent effect being an increase in melt index toward a steady-state value. The melt index of polyethylenes compounded with carbon black has been found to decrease, in some cases radically, although oxygen uptake data show no evidence of thermal instability. The melt index-time plot can be restored to its normal shape by adding excess quantities of a standard thioether antioxidant. Data are rationalized by assuming that polyethylene adsorbs on the available pigment surface, forming a crosslink network. The thioether antioxidant, however, may adsorb preferentially, thereby restoring the normal response of the polymer to forces resulting in its capillary extrusion. The results emphasize the contribution of chain orientation effects to the time dependence of melt index.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 16 (1972), S. 539-543 
    ISSN: 0021-8995
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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