1. The ability of crystalline ribonuclease to hydrolyze proteins is due to impurities present in the preparations and not to an intrinsic property of the ribonuclease molecule. The amounts of these impurities vary enormously with different preparations. 2. The dangers inherent in the use of crystalline enzymes as specific tools, without assaying them for all possible interfering impurities, are...

The Hotelling's  control chart, is the most widely used multivariate procedure for monitoring  two or more related quality characteristics, but it’s power lacks the desired performance in detecting small to moderate shifts. Recently, the variable sampling intervals (VSI) control scheme in which the length of successive sampling intervals is determined upon the preceding values has been proved t...

Context. Direct measurement of oxygen abundance for metal-rich galaxies from electron temperature is difficult or impossible since temperature-sensitive auroral lines generally become too weak to be measured. Aims. We aim to derive the electron temperature (Te) in the gas of metal-rich star-forming galaxies, which can be obtained from their ratios of auroral lines [O ]λλ7320,7330 to nebular l...

1 I n t r o d u c t i o n We say that the graphs H 1 , . . . , Hk can be packed into a graph G if G contains subgraphs isomorphic to H 1 , . . . , Hk and pairwise edge disjoint. The problem of packing graphs has been widely studied, especially when G is a complete graph. For instance, it is known that two trees with n vertices none of them equal to a star can be packed into K~ [2]. The packing ...

conclusions in the case of existence gaussian noise, the results confirm that denoising is not effective on the measurement of t2* value. in the case of image distortion by rician noise, a predictor model is proposed to estimate the original t2* value. the predictor model is used to estimate the t2* value of new patients. the predicted t2* values were in good agreement with the corresponding or...