No abstract

Heats of Combustion of Some Hydrocarbons 3223 DiscussionThe values in Table I are slightly higher than the average of previously reported data. Our data also show a small, but persistent, difference in the solubilities of the samples. The larger solubility of samples 3 and 4 is most likely due to the more perfect development of these crystals resulting from the slower rate of precipitation used in their preparation.Considering the temperature difference the data of Table II are in good agreement with those of Huybrechts and Ramelot2b and Pleissner.3

No abstract

No abstract

The influence of cow manure, soil bacteria, and Streptomyces sp. on the wet sieving stability and the mechanical strength of artificial soil aggregates.. The wet sieving stability of fresh and the mechanical strength of artificially dried aggregates from a Parabraunerde rich in coarse silt, with and without addition of 0,5% of cow manure, was determined during colonization with natural flora (unsterilized, re‐moistened) and with pure cultures of 11 soil bacteria and a Streptomyces sp. (after sterilization with ethylene oxide) during a 21 day incubation period. The mechanical strength of dried aggregates was chosen as a direct measure for comparison with the wet sieving stability. The differences showed however, that these two parameters of stability were only weakly correlated. The wet sieving stability was initially low. After addition of manure this stability was markedly increased during colonization with mixed flora and with Pseudomonas fluorescens, whereas the mechanical strength increased only slightly. In unamended soil the wet sieving stability of small aggregates was increased significantly only by Streptomyces sp. The mechanical strength was higher than in amended soil and was highest in unsterilized soil and in soil colonized by Arthrobacter sp. The mechanical strength decreased strongly after prolonged incubation. Die Verfasser danken Frau H. Karnapp und Fräulein D. Eggelsmann für ihre zuverlässige technische Assistenz.