This study compares two sets of measurements of the composition of bulk precipitation and throughfall at a site in southern England with a 20-year gap between them. During this time, SO(2) emissions from the UK fell by 82%, NO(x) emissions by 35% and NH(3) emissions by 7%. These reductions were partly reflected in bulk precipitation, with deposition reductions of 56% in SO(4)(2-), 38% in NO(3)(...

Chemical grout use began seriously some thirty years ago with the use of only a few types; silicates, acrylamide, epoxy, and some fatty acid derivates. Since then, the kinds of grout have proliferated with some of the originals still there, others dropping out entirely, and still others changing in type. This paper is about the current uses of chemical grouts, the economics of product use, and ...

Over 60% Serbian soils are heavy, shallow and acidic, especially in west part of this country. Basically, Serbian fruit production is mainly represented in these conditions which are not favorable for intensive fruit growing. However, repair of these soils is a long and very expensive process. Regarding to this, one of the real ways to overcome this problem faster and cheaper is to grow toleran...

clot, a certain degree of alkalinity is commonly acknowledged to be necessary. The supposed lessening of this alkalinity in scurvy, and the acute infectious diseases, is believed to be the cause of the decreased coagulability of the blood in these conditions. Also, it is essential for calcium to form a compound with nuclein, to make its union with fibrinogen possible. But, nuclein acts only as ...

By controlling the alkalinity and the amount of phosphotungstic acid (PTA), turbidity and gelling in the final colored solution obtained in the reaction between uric acid and PTA in the presence of sodium glycerol silicate (NaGS) can be eliminated without using antiturbidity reagents. The optimum range of alkalinity is 0.55-0.76 mEq. of excessalkali in a total volumeof 7.75 ml. A modification o...

Cross-metathesis involving N-heteroaromatic olefinic derivatives is disclosed. The introduction of an appropriate substituent on the heteroaromatic ring decreases the Lewis basicity of the nitrogen atom, thus preventing the deactivation of the ruthenium-centered catalyst. The reaction is quite general in terms of both N-heterocycles and olefinic partners.