Varian Assoc

Apparatus. The major components in the HPLC system (Figure 2) include a Varian HPLC pump (model 5000, Varian Assoc., Walnut Creek, CA), Altex injection valve (model 210, Beckman Inst., Fullerton,... 

Refractive index Analabs Applied Automation Cargille Labs., 55 Commerce Rd., Cedar Grove, N.J. 07009, U.S.A. DuPont Gow-Mac, 100 Kings Rd., Madison, N.J. 07940, U.S.A. Hewlett-Packard Laboratory Data Control Micromeritics Perkin-Elmer Siemens Tracor Varian Assoc. Waters Assoc. 

Conductivity Chromalytics Corp., Route 82, Unionville, Pa. 19375, U.S.A. Laboratory Data Control LKB Varian Assoc. 

N. S. Bhacca, D. P. Hollis, L. F. Johnson, and E. A. Pier, NMR Spectra Catalog. Varian Assoc., Palo Alto, California, 1963. 

A microscale SPE technique was developed in 1992 by Janusz Pawliszyn at the University of Waterloo, Ontario Canada. According to J. Berg of Varian Assoc., Walnut Creek, CA, the device shown in Figure 12-11, p. 135, "consists of a holder and a replaceable fiber assembly. The assembled unit looks much like a syringe, but in place of the hollow needle is a fiber inside a protective sheath. The fiber is attached to the holder plunger, so that it may be exposed by moving it out of the sheath. The fiber itself consists of a piece of fused silica rod coated with an adsorbent. 

Varian Associates recently re-examined this compound, and were able to detect a slight splitting characteristic of an AB pattern in the )3-fluorine resonance as well. (See No. 81 in the NMR at Work Series, Varian Assoc., Palo Alto, Calif, and Fig. 2 in the chapter by Treichel and Stone in Volume 1 of Advances in Organometallic Chemistry.)... 

Bildsae, H. 1996. STARS User s Guide, Spectrum Analysis of Rotating Solids. Varian Assoc., Pub. No. 87-195233-00, Rev. A0296. 

Many systems that have been used consist of a commercial fluorimeter fitted with a micro flow-through cell. Descriptions of such systems can be found in the papers by Katz and Pitt , Cassidy and Frei and Roth and Hampai , while the manufacturers of the fluorimeters used also market flow cells (Aminco and Turner Assoc.). Conmercial equipment especially designed for use in HPLC has also been available for several years, with emission lines and filters (Siemens, Dr. Ing. Herbert Knauer, Laboratory Data Control, DuPont, Varian), as well as with monochromators (Winopal Forschung, Perkin-Elmer, Schoeffel, Aminco, Turner Assoc., Jasco). Cells of these designs are small enough (ca. 20 gl) to be able to give a small contribution to the peak width with suitable connection lines and electronics. However, adequate information on this point is not generally available, in some instances perhaps because the reaction systems frequently used with these instruments contribute much more to the peak width. 

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