NEW CHEMICALS
HBD Test Kit
HI
PRECISION RESEARCH
NANOLITER
PORTABLE
HERE'S OUR OSMOMETER LINE, TODAY... What more can you expect from a leader? All of these outstanding osmometers a r e available from Advanced Instruments, the company which first introduced a freezing point osmometer back în I 9 5 5 . W e set out to become t h e l e a d e r s in o s m o m e t r y . . . a n d , if sales are any i n d i c a t i o n , w e h a v e succeeded. A few of the contributions we have made to WRITE
t h e science of osmometry are: The first schools of osm o m e t r y , the first m o d u l a r osmometer, the first thermoelectric refrigerator, the first portable model, and the first Hot Line © service system. N o w , in addition to the improved 1965 version of our original model we also have: a new air-cooled refrigerator with the longest life guaran-
FOR FREE INFORMATION
STATING
tee in the field, a Hi-Precîsîon Research Osmometer, and a Nanoliter Osmometer for samples less than one millimicrolifer. W e are adding others to our growing line. To us LEADERSHIP means continuing programs of product improvement, outstanding service, and fast delivery. W e think this is the way a leader should act. Don't you?
PRODUCT
INTEREST.
ADVANCED INSTRUMENTS, INC. 44 Kenneth Street / 617 DEcatur 2-8200 Newton Highlands, Massachusetts, 02161 Circle No. 7 on Readers' Service Card
A compact kit supplying all reagents needed for the colorimetric quantitation of the enzyme alpha-hydroxybutyric dehydrogenase (HBD) in serum is now available. The kit contains a reference standard of the HBD enzyme and sufficient quantities of HBD substrate, DPNH reagent, color developer (dinitrophenylhydrazine in hydrochloric acid), and 2N sodium hydroxide for 100 determinations. Hyland Laboratories, Morton Grove, III. 501
High Quality Solvents A new line of solvents, specially purified for use in the determination of pesticide residues by gas-liquid chromatography with the electron capture detector, is available. The solvents are labeled "Pesticidequality" and are certified to contain no interfering substances greater than that equivalent to 10 parts per trillion of a chlorinated pesticide. The following are now available: acetone, acetonitrile, benzene, 2-butanone, butyl alcohol, isobutyl alcohol, carbon tetrachloride, chloroform, cyclohexane, dichloromethane, dimethylformamide, ρ-dioxane, ether, ethyl acetate, ethyl alcohol, heptane, hexane, methanol, 2-methoxyethanol, 2-methylpentane, methyl sulfoxide, petroleum ether, isopropyl alcohol, toluene, and 2,2,4-trimethylpentane. Matheson Coleman & Bell, P. O. Box 85, East Rutherford, N. J. 502
Pressed Pellet Powders
HAVE YOU LOOKED INTO MODERN INSTRUMENTATION? Send today for our new Product Guide to the world's finest laboratory centrifuges and specialized laboratory instruments. SORVALL gives you the inside story. Centrifuges, Ultra-Microtomes, Homogenizers, Cell Fractionators are fully described and illustrated. We also include postage paid reply cards so you can request even further information. AC-3SPG.
Ivan Sorvall, Inc. N O R W A L K · C O N N E C T I C U T Circle No. 171 on Readers' Service Card 152 A
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ANALYTICAL CHEMISTRY
Pressed pellet powders carefully pre pared for use in solid phase infrared spectroscopy are available. Infrared spectrophotometric analyses are made on all materials prior to packaging. KBr with a refractive index of 1.56 at 0.59 micron is useful in the investigation of materials with refractive indices in the 1.4 to 2.3 range. TIBr with a re fractive index of 2.5 at 0.6 micron is useful in the near infrared region (1.5 to 4.0 microns). It is particularly valuable in the investigation of chalked or degraded pigmented films and plas tics, and other high index materials. Csl with a refractive index of 1.75 at 20 microns is said to offer advantages not previously available in powders for pressed pellets. Csl pellets can be pressed without the aid of intense heat, hence are useful in working with organic samples and other low re fractive index materials. Harshaw Chemical Co., 1945 East 97th St., Cleveland, Ohio 44106. 503
