Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Myelinated nerve cell perikaryon in mouse spinal cord (1972)
    Springer
    Cell & tissue research 128 (1972), S. 135-138 
    Details
    ISSN: 1432-0878
    Keywords: Spinal cord ; Mouse ; Myelinated neuronal soma ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Description / Table of Contents: Zusammenfassung Im Thorakalmark (Hinterhornbereich) einer Wildmaus wurde ein kleines Nervenzellperikaryon beobachtet, das vollständig von einer Markscheide umhüllt war. Die Zahl der Markscheidenlamellen variierte zwischen 7 und 12. An einer Stelle konnte ein sogenanntes inneres Mesoperikaryon nachgewiesen werden. Die Bedeutung dieses zufällig erhobenen Befundes ist vorerst noch offen.
    Notes: Summary In the thoracic cord (posterior horn region) of a wild mouse, we have observed a small nerve cell soma completely enveloped by a myelin sheath. The number of myelin lamellae varied between 7 and 12. In one place, the existence of an inner ‘mesoperikaryon’ could also be shown. The significance of this fortuitous finding has not yet been explained.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00306893
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Uteroglobin-like antigen in the male genital tract secretions (1975)
    Springer
    Cell & tissue research 165 (1975), S. 1-11 
    Details
    ISSN: 1432-0878
    Keywords: Rabbit seminal vesicle ; Rabbit seminal plasma ; Genital tract secretion proteins ; Electron microscopy ; Disc electrophoresis ; Immunoelectrophoresis
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The secretion of the rabbit seminal vesicle has been investigated by morphological and biochemical means. Apical regions of seminal vesicle epithelial cells show highly active protein synthesizing and releasing organells. The secretory proteins released are analysed by disc-electrophoresis and three different immunological procedures. There is evidence for the presence of an uteroglobin-like antigen in seminal vesicle secretion. Comparison with seminal plasma indicates that the uteroglobin-like protein is also present in this fluid. The immunological and electrophoretical identity of rabbit uteroglobin, obtained from the uterus, with “male uteroglobin” is obvious, but molecular-biochemical and biological identity awaits further clarification. The demonstration of uteroglobin-like antigen in the male as in the female points towards new aspects in reproductive and contraceptive research.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00222795
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Recurrent amyloid tumor of the parotid gland (1995)
    Springer
    European archives of oto-rhino-laryngology and head & neck 252 (1995), S. 53-56 
    Details
    ISSN: 1434-4726
    Keywords: Parotid gland ; Amyloidosis ; Electron microscopy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract A case of an organ-limited amyloid tumor of the left parotid gland is described with a history of recurrence. A slowly growing parotid mass was the only symptom. After 5.5 years following local excision, the patient was readmitted with a slowly growing recurrence in the superficial lobe of the previously treated gland. Lateral parotidectomy was performed with wide excision of the infiltrated tissue and preservation of the facial nerve. Primary amyloidosis of the AL type was confirmed with immunohistochemical studies revealing staining for lambda but not kappa light chains of immunoglobulins. There has been no clinical or laboratory evidence of systemic amyloidosis or recurrence after 2 years. To the best of our knowledge, this is the first report of a recurrent amyloid tumor of the parotid gland.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00171441
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Effects of by-products, trace components, and similar compounds in viscose on ripening (1961)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 5 (1961), S. 375-383 
    Details
    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: The effects on viscose ripening of a variety of materials are reported. (1) Normal constituents (Na2CO3, Na2CS3, NaCl) appeared not to affect ripening; however, Na2S retarded ripening. By-product removal appeared to retard ripening. (2) Oxidizing agents (H2O2, Na2Sx) accelerated ripening; reducing agent (Na2SO3) retarded ripening; this is suggestive of possible addition product formation. (3) Na2SO4, (CH3)2SO, KClO3, Na2BH4 showed no effect on ripening. (4) Salts which precipitated as hydroxides or carbonates did not appear to affect ripening. (5) Salts which formed insoluble sulfides resulted in an initial increase in ripening rates. In later stages, ripening proceeded normally, probably after the salts were removed from solution as insoluble sulfides. (6) FeCl3, BiCl3 and Na3AsO3 appeared to retard ripening. (7) A comparison of the effect on ripening of the trivalent state of elements in group V of the periodic table showed that the rate of ripening decreased with the oxidation potential of the element. (8) The addition of sodium zincate retarded ripening and suggested possible cross-linking of xanthate and by-product sulfur, or of two xanthate groups. (9) Addition of tin and chromium salts at the 0.5% level resulted in gelation of the viscose within 30 min. after the addition.
    Additional Material: 7 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1961.070051601
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Qualitätskontrolle von Rohren aus HDPEHerrn Dr.-Ing. Kurt Richard zum 70. Geburtstag gewidmet (1981)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 12 (1981), S. 11-13 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Quality Control of HDPE Pipes.Trials are reported made with the aim of finding an correlation between creep rupture test results obtained with two different types of testing samples: Pipes under internal pressure and tensile rods cut out of these pipes in a longitudinal direction.
    Notes: Es wird über Versuche berichtet, eine Korrelation zwischen Ergebnissen aus Zeitstand-Innendruckversuchen an HDPE-Rohren und Zeitstandversuchen an Längszugstäben aus diesen Rohren zu finden.
    Additional Material: 5 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19810120105
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Zeitstandfestigkeit und chemische Beständigkeit von Rohren aus Hartpolyäthylen und Polypropylen (1968)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 19 (1968), S. 22-25 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Creep strength and chemical resistance pipes made of hard polyethylene and polypropyleneThe creep strength of pipes made of thermoplastics is influenced by the surrounding medium. This influence may be of a chemical or physical kind. Often, both influences are simultaneously present. The present paper deals with these different types of influences of chemical substances on the creep strength of pipes made of hard polyethylene and polypropylene. First, the test method is described by which the creep strength is investigated in the presence of chemical stresses. This is followed by the communication of results obtained with different obcals. These include inorganic as well as organic media. According to these results the inorganic substances can, in respect of their effect on the creep strength, be divided into the following four categories: 1aqueous solutions of non-oxidant substances,2aqueous solutions of oxidant substances,3aqueous solutions of wetting agents,4aqueous solutions of substances which penetrate into polyethylene in small quantities, thus causing Some Sort swelling.The organic substances can be divided into those with strong and with weak swelling effects. The swelling effect, which depends on the chemical structure of the substances, is described in some detail.
    Notes: Die Zeitstandfestigkeit von Rohren aus thermoplastischen Kunststoffen wird durch das umgebende Medium beeinflußt. Dieser Einfluß kann chemischer oder physikalischer Art sein. Oft sind beide Einflüsse gleichzeitig wirksam. Die vorliegende Arbeit behandelt diese verschiedenen Arten des Einflusses chemischer Substanzen auf die Zeitstandfestigkeit von Rohren aus Hartpolyäthylen und Polypropylen. Es wird zunächst die Prüfmethode beschrieben, nach der die Zeitstandfestigkeit bei gleichzeitiger chemischer Beanspruchung untersucht wird. Anschließend werden Ergebnisse mitgeteilte, die mit verschiedenen Chemikalien gewonnen wurden. Es wird dabei sowohl auf anorganische als auch auf organische Medien eingegangen. Nach diesen Ergebnissen können die anorganischen Substanzen hinsichtlich ihrer Wirkung auf die Zeitstandfestigkeit in folgende vier Gruppen eingeteilt werden: 1wäßrige Lösungen von nicht oxydierend wirkenden Substanzen;2wäßrige Lösungen von oxydierend wirkenden Substanzen;3wäßrige Lösungen von Netzmitteln;4wäßrige Lösungen von Substanzen, die in geringer Menge in Polyäthylen eindringen und dadurch eine Art Quellung bewirken.Die organischen Substanzen körnert in stark und schwach quellend wirkende eingeteilt werden. Auf die Quellung, die von der chemischen Struktur der Substanzen abhängig ist, wird näher eingegangen.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19680190104
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Einfluß von Verfahrensparametern beim Fließpressen auf das Ermüdungsverhalten (1994)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 329-340 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Effect of Process Parameters in Extrusion on Fatigue BehaviourFatigue test specimens were produced by forward extrusion and subsequent heading from conventional steels, P/M steels and AlMg4.5Mn. The strain, die-opening angle, temperature and in some cases the lubricant were varied. For purpose of comparation in some cases also specimens were prepared by machining. S/N curves or cyclic deformation curves were determined mainly by stress-controlled tests.For all materials the time strength was increased by cold forming whereby the effect of strain was stronger than that of the die-opening angle. The time strength of steel is less increased by warm (semihot) forming than by cold forming. The fatigue strength, however, is not necessarily increased by cold or warm forming. After cold forming the P/M steels contrary to conventional steels revealed mainly quasielastic deformation until fracture. After warm forming, however, P/M steels, due to the decrease of porosity, behaved almost like conventional steels. For AlMg4.5Mn specimens prepared by forming - probably due to worse surface quality - revealed a lower fatigue strength than those prepared by machining. Here also a feasible effect of the choice of the lubricant was stated.
    Notes: Aus schemelzmetallurgischen und Sinterstählen sowie AlMg4,5Mn wurden durch Fließpressen und Anstauchen von Köpfen bauteilähnliche Schwingproben hergestellt. Dabei wurden Umformgrad, Schulteröffnungswinkel, Temperatur und z.T. der Schmierstoff variiert. Zu Vergleichszwecken wurden in Einzelfällen Schwingproben spannend hergestellt. Wöhlerkurven oder Wechselverformungskurven wurden zumeist in spannungskontrollierten Versuchen ermittelt. Für alle Werkstoffe wurde eine Erhöhung der Zeitfestigkeit durch eine Kaltumformung beobachtet. Der Einfluß des Schulteröffnungswinkels war schwächer als der des Umformgrades. Eine Halbwarmumformung von Stahl steigert die Zeitfestigkeit weniger als eine Kaltumformung. Die Dauerfestigkeit wird durch Kalt- oder Halbwarmumformung nicht notwendig gesteigert. Die Sinterstähle zeigten kaltfließgepreßt anders als konventionelle Stähle vornehmlich quasielastische Verformung bis zum Bruch. Halbwarmumgeformt verhalten sich Sinterstähle jedoch aufgrund der verringerten Porosität nahezu wie konventionelle. Für AlMg4,5Mn zeigten umgeformte Schwingproben im Vergleich zu spanend gefertigten - vermutlich aufgrund der schlechteren Oberfläche - eine niedrigere Dauerfestigkeit; hier wurde auch ein deutlicher Einfluß des Schmierstoffes beobachtet.
    Additional Material: 16 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19940250807
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Beitrag zur quantitativen Bewertung thermisch aktivierter Werkstoffreaktionen (1994)
    Weinheim : Wiley-Blackwell
    Materialwissenschaft und Werkstofftechnik 25 (1994), S. 341-348 
    Details
    ISSN: 0933-5137
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: On the quantitative valuation of thermally activated material reactionsThis paper gives an insight into the fundamentals and application of the quantitative valuation of thermally activated material reactions, especially of static softening processes. Possibilities of calculating based on diffusion and chemical kinetics are reported not only for isothermal, but also generally for thermally nonstationary conditions. The special cases of constant heating or cooling rates and of constant temperatures which nearly exclusively have been described in the literature follow automatically from these more universal equations given here. For a more precise description of softening processes it is proposed that the ARRHENIUS formula is modified and generalized by introducing a temperature threshold value, i.e., a minimum or reference temperature. This allows the material softening process that independently of time always can be observed only above a minimum temperature to be represented in this way also by the physical-mathematical model. Integrals are calculated and explizit solutions are given for characteristic temperature-time dependences. Finally, the fundamental method of determining the model parameters is described.
    Notes: Der Beitrag gibt einen Einblick in Grundlagen und Anwendung der quantitativen Bewertung thermisch aktivierter Werkstoffreaktionen, insbesondere bei statisch ablaufenden Entfestigungsvorgängen. Berechnungsmöglichkeiten werden auf der Grundlage von Diffusion und chemischer Kinetik nicht nur für isotherme, sondern allgemein für thermisch beliebig instationäre Bedingungen angegeben. Die im Fachschrifttum fast ausschließlich betrachteten Spezialfälle konstanter Erwärmungs- oder Abkühlraten und konstanter Temperaturen ergeben sich aus den hier angegebenen allgemeingültigeren Gleichungen zwanglos. Zur präziseren Beschreibung von Entfestigungsvorgängen wird vorgeschlagen, den Arrhenius-Ansatz dahingehend zu modifizieren bzw. zu verallgemeinern, daß ein Temperaturschwellenwert - eine Mindestbzw. Bezugstemperatur - in geeigneter Weise eingeführt wird. Dadurch wird erreicht, daß eine Werkstoffentfestigung, die - praktisch unabhängig von der Zeitdauer - immer erst oberhalb gewisser Mindesttemperaturen beobachtbar ist, in dieser Weise auch durch das physikalisch-mathematische Modell erfaßt und widergespiegelt wird. Für charakteristische Temperatur-Zeit-Abhängigkeiten werden die auftretenden Integrale berechnet und explizite Lösungen angegeben. Abschließend wird der prinzipielle Weg zur Bestimmung der Modellparameter skizziert.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/mawe.19940250809
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Anwendung von Rohren großen Durchmessers aus HartpolyäthylenHerrn Prof. Dr. E. Rabald zum 65. Geburtstag gewidmet (1964)
    Weinheim [u.a.] : Wiley-Blackwell
    Materials and Corrosion/Werkstoffe und Korrosion 15 (1964), S. 51-58 
    Details
    ISSN: 0947-5117
    Keywords: Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Application of large-diameter pipes made of hard polyethyleneWith the aid of numerous illustrations, the applications of polyethylene pipes of relatively large diameters are surveyed. A special account is given of the advantages which such pipes may offer under different installation conditions. Especially in the Scandinavian countries  -  Norway, Finland and Sweden  -  where pipes are laid in the open even during the winter months, the toughness of hard polyethylene, even at low temperatures, is found to be a particular advantage. A special problem is posed by the need for a reliable jointing of large-diameter pipes. It is shown that, if the necessary conditions are adhered to, and if suitable aids are used, it is possible to obtain reliable butt welds, both between one pipe and another, and between pipe and welding collar. Such welding collars can be made in different ways. For instance, a mould is filled with the aid of an extruder and a rough cast prepared which, after cooling, is machined on a lathe. Pipes made of hard polyethylene are used not only for drinking water pipes but also for special purposes, e. g. cable protection pipes. For this purpose, a special technique, known as jetting method, is sometimes used for laying pipes across water.
    Notes: Anhand einer großen Anzahl van Bildern wird über den Einsatz van Rohren relativ großen Durchmessers aus Hart-Polyäthylen berichtet. Dabei wird auch auf die Vorteile, die solche Rohre unter den verschiedensten Verlegebedingungen bieten, näher eingegangen. Gerade in skandinavischen Ländern wie Norwegen, Finnland und Schweden, wo auch während der Wintermonate Rohrverlegungen im Freien stattfinden, erweist sich die gute Zähigkeit von Hart-Polyäthylen auch in der Kälte von besonderem Vorteil. Ein besonderes Problem stellt die zuverlässige Verbindung von Rohren großen Durchmessers der. Es wird gezeigt, daß bei Einhaltung der erforderlichen Bedingungen und bei Verwendung geeigneter Hilfsgeräte einwandfreie Stumpfschweißungen sowohl der Rohre untereinander als auch von Rohr und Vorschweißbund erzielt werden können. Die Herstellung solcher Vorschweißbunde kann auf verschiedene Arten vorgenommen werden; z. B. wird mit Hilfe eines Extruders eine Form gefüllt und durch Pressen ein Rohling hergestellt, der nach dem Erkalten auf einer Drehbank bearbeitet wird. Neben der Verwendung van Rohren aus Hart-Polyäthylen für Trinkwasserleitungen werden sie auch für Spezialzwecke, wie z. B. Kabelschutzrohre, eingesetzt. Dabei wird in manchen Fällen eine besondere Verlegetechnik beim Durchqueren van Gewässern, das sog. Einspülverfahren, angewandt.
    Additional Material: 36 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/maco.19640150109
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Factors affecting viscose ripeningThis paper was presented before the Division of Cellulose Chemistry at the 136th Meeting of the American Chemical Society, Atlantic City, N. J., September 13-18, 1959. (1960)
    New York, NY [u.a.] : Wiley-Blackwell
    Journal of Applied Polymer Science 4 (1960), S. 16-24 
    Details
    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: Ripening of spinnable viscoses has shown dexanthation rates to be constant for sulfate pulps; however, sulfite pulps appeared to ripen slightly faster than the sulfate pulps. The rate of dexanthation was unaffected by changes in alkalinity over relatively narrow ranges, and slightly affected by sulfur and cellulose content. Dilution of the viscose increased the dexanthation rate. A molar activation energy of 23 kcal. was calculated from a study of temperature effects on dexanthation of a high alpha sulfate pine pulp. Changes in salt index with respect to degree of substitution for all viscoses xanthated and dissolved at 25°C. followed the same linear function. For viscoses prepared at lower xanthation and/or dissolving temperatures, the ripening curves exhibited an initial rise suggesting two simultaneous changes: dexanthation and a randomizing of substitution. Split xanthation (the final xanthation step under essentially homogeneous conditions) yielded viscose having random substitution and exceptionally high salt index. As this solution ripened the salt index decreased linearly with respect to degree of substitution and eventually followed the same function as normally xanthated viscose, indicating that the final internal structures of the two solutions are similar.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/app.1960.070041003
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...