Wasserrückhaltevermögen von Recyclingspänen und von direkt aus Holz gewonnenen Spänen

Ohne Zusammenfassung     

Einfluss der Alterung UF-Harz gebundener Holzspanplatten auf die Abgabe flüchtiger Säuren

The release of volatile organic acids from UF-bonded particleboards made from Scots pine was assessed after production as well as after aging for 13 years. The results reveal that aging significantly decreased the release of formic acid and substantially increased the emanation of acetic acid. The change in the release of volatile acids by aging seems to be highly independent of the hardener type used (ammonium chloride, ammonium nitrate) as well as of the amount of added hardener.     

Results of stationary management of patients with hypertension with reference to previous ambulatory care]

The case histories of 100 patients who were hospitalised in the Department of Internal Medicine of St. George's Hospital in the period from January 1975 to March 1976 are analysed mainly to study their treatment as outpatients (information of the patient, previous diagnoses and treatment, and diagnosis at the time of hospitalisation) and the results of their in-hospital treatment. Most of the patients were admitted to hospital at an advanced stage, usually when out-patient treatment had failed to produce results, but in 80% of the cases the result of in-hospital treatment was satisfactory or good. Besides improvement in drug combination and treatment of cardiac insufficiency, the most frequent complication, observation of general therapeutic principles under conditions of in-hospital treatment was found to be of special importance. Over and above this, we regard close cooperation of hospital and out-patient clinic as essential in the optimisation of the treatment of hypertension.     

Benetzung von TMP und CTMP aus Holz sowie gebrauchten mitteldichten Faserplatten (MDF)

TMP (thermo-mechanical pulps) and CTMP (chemo-thermo-mechanical pulps) were made from pine wood and recycling MDF, which has been prepared from pine wood too. The fibres were tested for their wettability using the method developed by Roffael et al (2002). The results reveal that TMP are much less wettable in comparison to CTMP from the same wood. Moreover, fibres made from UF-bonded MDF by the TMP- and CTMP-process are of much higher wettability compared to TMP and CTMP prepared directly from wood. No significant difference in the wettability between TMP and CTMP from UF-bonded MDF was detected. This behaviour has been attributed to the fact that the UF-resin in MDF degrades during thermohydrolytic pulping leading to the formation of ammonia and free urea. Therefore, pulping of UF-bonded boards takes place under chemo-thermo-mechanical conditions (CTMP).     

Über den Einfluss des Bindemittels auf das Wasserrückhaltevermögen (WRV-Wert) von Recyclingfasern und Recyclingspänen

Zusammenfassung Der hydrophobierende Einfluss des in Gebrauchspänen und -fasern vorhandenen Bindemittels ist bekannt (vgl. Roffael und Schneider 1978, 1979). Erste Untersuchungsergebnisse deuten darauf hin, dass dieser Einfluss durch die ohne großen Aufwand durchführbare Messung des WRV-Wertes erfasst werden kann.

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Influence of binders on the water retention value (WRV) of glued recycling fibers and chips

The hydrophobing influence of binders on the equilibrium moisture content (EMC) of wood and fibers is well known in the literature (Roffael und Schneider 1978, 1979). Preliminary experiments reveal, that this effect can be assessed by measuring the water retention value (WRV) of glued recycling fibers and chips.

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Mitteilung aus dem Lehrbereich Holzchemie und Holztechnologie des Instituts für Holzbiologie und Holztechnologie der Universität Göttingen     

Immunomodulating properties of the antibiotic novobiocin in human monocytes

We show that the coumeromycin antibiotic novobiocin, a potent inhibitor of ADP ribosylation, prevents lipopolysaccharide (LPS)-induced tumor necrosis factor alpha (TNF-alpha), interleukin-1 (IL-1), IL-6, and IL-10 secretion in human peripheral blood mononuclear cells. It shares these cytokine-suppressing properties with other inhibitors of ADP ribosylation. We found that novobiocin prevents TNF-alpha production by inhibiting translation of the TNF-alpha mRNA. Elevated TNF-alpha levels in mice treated with D-galactosamine (GalN)-LPS or GalN-TNF were not reduced by novobiocin; however, the drug exhibited hepatoprotective properties. Novobiocin causes downregulation of the surface molecules on monocytes, among which CD14 was the most affected. The diminished expression of surface molecules was not observed on T and B lymphocytes. Similar to other inhibitors of ADP ribosylation, novobiocin prevents LPS-induced phosphate labelling of gamma-actins.