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  • 11
    Electronic Resource
    Electronic Resource
    NMR study of rubber crosslinking in model networks (1981)
    Springer
    Colloid & polymer science 259 (1981), S. 990-994 
    Details
    ISSN: 1435-1536
    Keywords: NMR ; proton spin-spin relaxation ; styrene-butadienestyrene block copolymer ; rubber crosslink density
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung Zur quantitativen Erfassung der Vernetzung eines Kautschuks ist es wünschenswert, die Vernetzungsdichte des Netzwerks zu bestimmen. Styrol-Butadien-Styrol Blockcopolymere können als Modellnetzwerke für einen Kautschuk mit einheitlichen Netzbogenlängen angesehen werden. Für die Modellnetzwerke wird die Beziehung zwischen der Protonen Spin-Spin-Relaxationszeit und der Vernetzungsdichte bestimmt. Unterhalb eines kritischen Molekulargewichts (M c = 40 000) des Kautschuks, das der Bildung von Verschlaufungen entspricht, ist die Spin-Spin-Relaxationszeit proportional zur Netzbogenlänge; oberhalb des kritischen Wertes ist sie nahezu unabhängig vom Molekulargewicht des Kautschuks.
    Notes: Summary For a quantitative description of rubber crosslinking it is desirable to determine the crosslink density of the network. Styrene-butadiene-styrene block copolymers can be regarded as model networks for a rubber with uniform chain lengths between the crosslinks. For these model networks the relation between the proton spin-spin relaxation time and the crosslink density is determined. Below a critical value for the molecular weight of the rubber segment (M c = 40 000) which corresponds to the formation of entanglements, the relaxation time is proportional to the crosslink spacing. Above the critical value the relaxation time is almost independent of the molecular weight of the rubber.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01558612
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  • 12
    Electronic Resource
    Electronic Resource
    Gas chromatographic method to determine formaldehyde traces in automobile exhaust gases (1982)
    Springer
    Chromatographia 15 (1982), S. 631-634 
    Details
    ISSN: 1612-1112
    Keywords: Gas Chromatography ; FID with integrated hydrogenation reactor ; Formaldehyde traces ; Automobile exhaust gases
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Summary A method for the gas chromatographic determination of traces of formaldehyde is described. The formaldehyde is detected by means of a modified FID which contains a microreactor inside the jet for the hydrogenation of formaldehyde to methane. Only a slight modification to an ordinary FID is needed with no additional gas tubes and no alteration to the existing detector heater. The additional dead volume and peak broadening is negligible. The system is calibrated by means of a gas generator. The described method is used for determining the content of formaldehyde in the exhaust gases of methanol-driven cars.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02279489
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  • 13
    Electronic Resource
    Electronic Resource
    Capping of conconavalin a receptors on lymphocytes of aged individuals and patients with Down’s syndrome: Enhancing effect of colchicine; possible relation to microtubular system (1981)
    Springer
    Age 4 (1981), S. 5-8 
    Details
    ISSN: 1574-4647
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract The redistribution of conconavalin A (Con A) receptors on peripheral blood mononuclear cells was studied in young adult patients with Down’s syndrome (DS), and young-adult controls and aged normal volunteers. DS was included in the study as it shows many features of accelerated aging. The percentage of Con A capping was markedly lower in DS patients and aged individuals than in young-adult controls. Colchicine displayed a significant enhancing effect on Con A capping in DS patients and aged individuals, but a moderate inhibitory effect on Con A capping in the young adults. The enhancing effect in DS patients and aged volunteers suggests the possibility that an excess of polymerized tubulin (microtubules) may occur in lymphocytes during normal or accelerated aging.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02432276
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  • 14
    Electronic Resource
    Electronic Resource
    175. Postoperatives Beschwerdebild nach Dünndarmresektionen (1981)
    Springer
    Langenbeck's archives of surgery 355 (1981), S. 549-549 
    Details
    ISSN: 1435-2451
    Keywords: Resection of the ileum ; Postoperative symptomes ; Ileumresektion ; Postoperatives Beschwerdebild
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Zur Erfassung des klinischen Beschwerdebildes dünndarmresezierter Patienten wurden von 197 Patienten mit isolierter Dünndarmresektion aus den Jahren 1958-1978 der Chirurgischen Universitäts Klinik Bonn 68 Patienten befragt und die Ergebnisse ausgewertet. Von diesen wurde bei 14 Patienten weniger als 30 cm Ileum reseziert, bei 21 Patienten 30- 80 cm, bei 19 Patienten 80-150 cm und bei 9 Patienten mehr als 150 cm. Bei 5 Patienten wurden 80 cm Jejunum reseziert. 53 (77,9%) der befragten Patienten gaben z. Z. der Entlassung Durchfälle an. Bei 16 Patienten (23,5%) trat postoperativ keine Besserung ein, bei 26 Patiente (38,2%) dauerte die Adaptation 3 Monate bis zu 1 Jahr. Zwischen Resektatlänge und Stuhlfrequenz sowie allgemeinem Beschwerdebild fand sich bei fast allen Gruppen eine Korrelation.
    Notes: Summary To document the clinical symptoms after partial resection of the small intestine 68 patients of a total of 197 patients operated during the period of 1958-1978, Department of Surgery, University of Bonn, were evaluated for their postoperative symptoms. Of the 68 patients 14 had a resection of less than 30 cm of the ileum, 21 patients of 30–80cm, and 9 more than 150cm. Five patients had undergone a resection of 80 cm of jejunum. Of these patients 53 (78%) had diarrhea at the time of discharge from the hospital. A normalisation of the bowel movement appeared after 3 to 12 months in 26 patients (38%),16 patients (24%) experienced no improvement at all. A correlation between the length of intestinal resection and requency of bowel movements as well as general symptoms was found in all groups of patients.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01287005
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  • 15
    Electronic Resource
    Electronic Resource
    121. Ursachen für das gehäufte Auftreten von Cholesteringallensteinen nach Resektion des terminalen Deums (1982)
    Springer
    Langenbeck's archives of surgery 358 (1982), S. 471-471 
    Details
    ISSN: 1435-2451
    Keywords: Ileal resection ; Biliary secretion ; Cholesterol gallstone formation ; Ileumresektion ; biliäre Sekretion ; Cholesteringallensteinbildung
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Zusammenfassung Patienten mit Resektion des terminalen Ileums weisen eine erhöhte Incidenz von Cholesteringallensteinen auf. Zur Aufklärung des Mechanismus der Steinbildung wurde bei 5 Patienten mit Ileumresektion (mehr als 120 cm) und bei 5 Kontrollpersonen die biliäre Lipidsekretion über 24 h gemessen. Die biliäre Sekretion von Gallensäuren (GS), Phospholipiden (PL) und Cholesterin (CH) war bei den resezierten Patienten um 52 %, 53 % bzw. 47 % erniedrigt. Die Reduktion der CH-Sekretion war nicht so ausgeprägt wie die von GS und PL. Aus diesem Grunde war die Galle bei Ileumresezierten 14 h am Tag mit CH übersättigt, im Gegensatz zu 7h bei den Kontrollpersonen (p 〈 0,0s1).
    Notes: Summary Patients with resection of the ileum are at increased risk of forming cholesterol gallstones. In order to investigate the underlying mechanism of stone formation, biliary lipid secretion was measured for 24 h in five patients after ileal resection (more than 120 cm) and five controls. The biliary secretion of bile acid (BA), phospholipids (PL), and cholesterol (CH) in ileal resected patients was reduced by 52%, 53%, and 47%, respectively. The reduction in cholesterol secretion rate was not as much as that of BA and Pl. As a result, the bile in patients with ideal resection was supersaturated with CH for 14h in contrast to 7 h in control subjects (p 〈 0.01).
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01271868
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  • 16
    Electronic Resource
    Electronic Resource
    Zur Kenntnis der Verbindungen des zwei- und dreiwertigen Vanadins. I. Über die Ammoniakate des Vanadin(III)-chlorids (1950)
    Weinheim : Wiley-Blackwell
    Zeitschrift für anorganische Chemie 262 (1950), S. 223-228 
    Details
    ISSN: 0372-7874
    Keywords: Chemistry ; Inorganic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: 1.Es wurde das Verhalten von VCl3 gegen NH3 untersucht. Dabei fanden sich Ammoniakate mit 12, 7, 6, 5, 3 und 2 NH3. Die Bildungswärmen wurden berechnet.2.Die Ergebnisse sind bei Temperaturen oberhalb Zimmertemperatur mit Beobachtungen von EPHRAIM und AMMANN im Einklang; dagegen konnten die Angaben von J. MEYER und BACKA über die Entstehung von Vanadinnitrid bei der Einwirkung von NH3-Gas auf VCl3 nicht bestätigt werden.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/zaac.19502620128
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