The first edition of this work (viii, 182 p.) appeared in 1937 and the size of its page was 19.1 X 26 cm. For the second edition a photographic copy of these pages was made in reduced size, the only changes being in the addition on page viii of a preface for the second edition, and of nine new words on the title page. It will be observed, however, that an Appendix of 40 new pages has been added...

Marijuana is one of the most commonly used illicit substances, resulting in it being frequently encountered in clinical samples. The most common sample utilized for drug screening and confirmation in the clinical laboratory is urine. Due to the nature of urine and the various constituents residing in it, sample clean-up can be important. Solid Phase Extraction (SPE) is an effective method for s...

This paper concentrates on the requirements of being an integral curve for geodesic spray natural lift curves spherical indicatrices timelike-spacelike involute-evolute pair in Lorentz 3-space. In addition, obtained results were supported by one example.

DNA shuffling is a powerful method used for in vitro evolute molecules with specific functions and has application in areas such as, for example, pharmaceutical, medical and agricultural research. The success of such experiments is dependent on a variety of parameters and conditions that, sometimes, can not be properly pre-established. Here, two computational models predicting DNA shuffling res...

The evolute of a conic in the pseudo-Euclidean plane is locus centers all its osculating circles. It’s curve order six and class four general case. In this paper we discuss compute evolutes different types conics. We will highlight those cases that have no analogy Euclidean plane.