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59400 documents, page 1 of 5940

広告

(1975)

Mortar cohesión. The effect of additives

This study was concerned with the hydration of clinker compounds in the presence of different additives; it appeared that accelerating additives, such as calcium chloride and silicic acid, produce longer fibers of tobermorite, whereas inhibitors, such as sugar, produce shorter fibers of tobermorite. This same effect was observed in the hydration of anhydrite, in which large crystals of gypsum were produced in the presence of sodium sulphate. So the cohesion in mortars of cement and anhydrite ...

Isolation and characterization of lambda transducing bacteriophages for the su1+ (supD minus) amber suppressor of Escherichia coli.

Specialized lambda transducing phages for the sul+ (supD-) amber suppressor in Escherichia coli K-12 have been isolated, using a secondary site lambda-cI857 lysogen in which we have shown the prophage to be closely linked to sul+.sul+ transducing particles were detected frequently, at 10-5 per plaque-forming unit, in lysates prepared from the secondary-site lysogens. High-frequency transducing lysates were obtained from several independently isolated sul+ transductants and were analyzed by Cs...

Polymorphism of human alpha fucosidase.

A common polymorphism of human alpha fucosidase has been detected by the technique of isoelectric focusing on thin layer acrylamide gel. Family studies have shown that the three common phenotypes Fu 1, Fu 2, and Fu 2-1 represent homozygosity or heterozygosity for two autosomal codominat alleles, Fu1 and Fu2.Frequencies of the Fu1 and Fu2 alleles in the New York populations studied were .753 and .247 among whites and .926 and .074 among blacks, respectively.

A Comparison of Community College Students' Achievement and Attitude Changes in a Lecture-Only, Lecture-Laboratory, Lecture-Recitation Approach to General Education Biological Science Courses

student achievement and attitude changes toward science resulting from three different approaches used in teaching introductory general education biology at Diablo Valley Community College in Pleasant Hill, California , were compared. The three teaching approaches used were the lecture-only, lecture - laboratory and lecture-recitation. The sample was composed of 129 students enrolled in Biology 101 and 102 at Diablo Valley Community College during fall semester 1974-75. Forty-three student...