Serum alpha globulin fraction: survival-and-recovery effect in irradiated mice

An alpha macroglobulin fraction (19S) was isolated from the serum of rats and BC(3)F(1) mice by zonal ultracentrifugation. Both the isologous and heterologous macroglobulin fractions increased survival among BC(3)F(1) mice x-irradiated with 750 roentgens. The mouse macroglobulin fraction also enhanced radiation recovery of hematopoietic tissue as measured by colony-forming assay and iron-59 incorporation into erythropoietic cells. The overall difference in hematopoietic activity in the irradiated (400 roentgens) mice treated with the macroglobulin fraction, in comparison with this activity in the controls, was three- to fivefold in the bone marrow and nine- to tenfold in the spleen between days 4 and 7 after irradiation. This effect was not obtained with the isologous serum protein fraction containing proteins of smaller molecular weight.     

Cellulases Can Enhance beta-Glucan Synthesis

beta-Glucan synthesis from uridine diphosphoglucose by pea epicotyl tissue slices is increased two- to threefold by preliminary, short-term treatment with cellulases purified from auxin-treated peas. We suggest that cellulases introduce chain ends in accessible regions of cellulose microfibrils which then act as primers for chain elongation.     

塔里木地区土壤理化参数的相关性和重要性分析

随着西部油气资源的开发，大量金属设施将埋在荒漠和盐渍土中，腐蚀与腐蚀控制问题已经提到议事日程上。为此在塔北５个油区及２条长输管道沿浅近２万ｋｍ＾２的地区进行了一全面的，综合性的土壤环境腐蚀性调查，选取１０３个土壤调查点进行了测试，获得大量数据。土壤理化性质的测发为室内和野外两部分进行，并采用主分量分析法（ＰＣＡ），对测量数据中重要的２４种理化参数变量之间的关系进行了相关性及重要性分析，分析结果表明     

Comment on "A G protein coupled receptor is a plasma membrane receptor for the plant hormone abscisic acid"

Liu et al. (Reports, 23 March 2007, p. 1712) reported that the Arabidopsis thaliana gene GCR2 encodes a seven-transmembrane, G protein-coupled receptor for abscisic acid. We argue that GCR2 is not likely to be a transmembrane protein nor a G protein-coupled receptor. Instead, GCR2 is most likely a plant homolog of bacterial lanthionine synthetases.