some* •"Si every· one That just about describes

Canalco's UV-visible, transmission-fluorescence,

peak-calculating, gradient-scanning,

column-monitoring, cuvette-measuring,

baseline-integrating, 15 μ-resolving,

Disc gel-to-10" plate-holding, trace-normalizing,

super-versatile Recording

Microdensitometer/ Spectro-Photometer

— the new G II or its little brother,

the new Κ II.

For use with: TLC plates all electrophoretic media

micrographs slides

diffraction patterns gradient tubes

autoradiographs films

static cuvettes flow cuvettes, etc.

CIRCLE 32 O N READER SERVICE CARD

New Products

Miniature valves and f i t t ing componen ts for high-pressure lab and scale model pilot p lant research are avai lable. Prod­ucts are useful where pressures to 30,000 psi are required and where smal l vo lumes are desi red. Both manua l and au tomat ic valves in all s tandard con­f igurat ions and a ful l line of f i t t ings and assembly componen ts are supp l ied . Sci­ent i f ic Systems, Inc. 814-237-6265 411

High-intensity grating monochromators with digi tal wavelength display and op­t ional wave length dr ive are avai lable in five easily in terchangeable grat ing as­sembl ies: 200-400, 350-800, 0.7-1.6, 1.4-3.2, and 200-800 n m . Five l ight sources are also avai lable: xenon , super-pres­sure mercury, high-pressure mercury, t ungs ten -ha l i de , and deu te r ium; f ixed and var iable slits are o f fered. $1250 to $2435. B a u s c h & L o m b . 716-232-6000 412

X-ray energy spectrometer 5000A fea­tures a 1024 X 20-bit memory , Lowes' l ive-t ime correct ion, pulse pi le-up rejector, spectroscopy grade l inear ampl i f ier , a lpha-numer ic video display ( ident i fy ing X-ray energies and counts ful l -scale), detector bias supp ly , and a wide var iety of readout capabi l i t ies. Appl icat ions are in microanalysis in conjunct ion wi th scanning-electron microscopes, pol lu­t ion t race analysis, qua l i ty cont ro l , and pathology studies. $8900. Kevex Corp. 415-697-6901 413

Microspectrofluorometer for the mea-urement of f luorescence exci tat ion and emission spectra occurr ing in single cells, t issue sect ions, etc., can be used for spect rophotomet r ic measurements of absorpt ion and /o r percent t ransmiss ion , for spect rodens i tometr ic measurements by absorpt ion and scattered l ight, and for autoradiography. $15,000. Schoeffel Ins t rument Corp. 201-664-7263 414

and a bonus too Yes, Canalco's unique new Baseline Integrator gives you ali the benefits of a peak-calculating computer without buying one. Now you car: read percent-of-total, mg concentration or enzyme strength of each-peak, A / G ratios, etc right off the chart trace . . . exclusively with Canalco Microdensitometers . . . without courrmg pips or zigzags . . . without a slide rule or calculator or even a pencil1

For more about this fascinating advance in quantitative microdensitometry, write:

CANALCO o635 Fisher Lane RockviLe, Md. 20852 or

CANALCOEUROPE P.O Box 7 Vlaardingen, Holland

CIRCLE 33 O N READER SERVICE CARD

ANALYTICAL CHEMISTRY, VOL. 44, NO. 12, OCTOBER 1972 · 97 A

P.O. Box 7 Vlaardingen, Holland

or CANALCOEUROPE

5635 Fisher Lane Rockville, Md. 20852

CANALCO

For a slightly less abbreviated / _ description, write: