Cell Counter
W~~~~~~~~~~~~~~~~~~~L~~~~~~~11
Repetitive Pipette
The Micro-Doser is available as a solidor soft system with disposable assem-blies. Up to 25 liquid samples may beloaded and dispensed, one-handed, with-out refilling the instrument. The solidsystem features a needle and uses posi-tive liquid displacement. The soft systemfeatures plastic tips and uses an air inter-face. Color-coded sizes include 25, 50,and 100 microliters (either system) and200 microliters (soft system-only). Anyof these capacities may be used with a
single handle. Oxford Laboratories.Circle 668.
Anaerobic Loop Sterilizer
The Cool-Loop electronic loop steriliz-er is designed for use in anaerobic andother oxygen-free atmospheres where a
flame cannot be used. It is also suitablefor use in laminar-flow hoods, gloveboxes, dry boxes, inert-gas atmo-spheres, and, with a protective hood, onan open bench. It requires no warm-upand it operates from standard line volt-age. Xanax. Circle 666.
Scanning Spectrofluorometer
The Series 800 scanning, photon-counting spectrofluorometer measures
fluorescence excitation and emissionspectra and fluorescence polarization.Aberration-corrected, holographic grat-ings in the double-grating mono-chromator allow only one part in 1012 or
1014 stray light with a 450-watt xenon-arc
lamp illuminating the input slit, thusgreatly increasing sensitivity of the in-
strument. A universal sample chamberaccommodates various sample holders.The polarization optics permit a half-dozen modes of operation and this maybe increased by adding second-channeloptics or a second emission mono-
chromator. With the Series 800 in-strument, specialized analyses, such as
the measurement of energy transfer be-tween fluorescent species or thermody-namic and kinetic determinations, may
be performed in addition to the study ofother fluorescence phenomena. SLM In-struments. Circle 674.
X-ray Spectrometer
Ultra-Trace determines presence ofmany trace elements simultaneously,nondestructively, and rapidly. Minimumlimits of detection for elements of atomicnumbers 23 through 92 are on the orderof 50 to 100 picograms. Minimum limitsfor elements of atomic numbers 9through 22 are somewhat higher. Kevex,Analytical Instrument Division. Circle672.
Newly offered instrumentation, apparatus, andlaboratory materials of interest to researchers in alldisciplines in academic, industrial, and governmentorganizations are featured in this space. Emphasis isgiven to purpose, chief characteristics, and avail-ability of products and materials. Endorsement byScience or AAAS is not implied. Additional infor-mation may be obtained from the manufacturers orsuppliers named by circling the appropriate numberon the Readers' Service Card (on pages 126A and214A) and placing it in the mailbox. Postage is free.
-RICHARD G. SOMMER
14 JANUARY 1977
The JTB-700 is a seven-parameterblood cell counter with a hard-copy print-er. Counting is monitored by a micro-processor that is programmed to count,correct for coincidence, and perform cal-culations and to communicate withthe operator through a verbal-digitalalphanumeric display and a printer.Patient blood samples are automaticallydiluted and presented to the instrument.Each sample is counted twice; if theresults vary by more than 4 percent, thesample is counted again. Malfunctionsare detected and corrective proceduresare listed on the display for action by theoperator. Approximately 35 to 40 sam-ples may be analyzed in an hour. J. T.Baker Instruments. Circle 673.
Scanning Electron Beam Analyzer
The Microscan 9 incorporates a contin-ually variable accelerating voltage from 1to 60 kilovolts with fully compensatedelectron optics. In conjunction with acomputer-controlled specimen stage andan x-ray spectrometer, optimum oper-ating conditions are obtained for all anal-yses. Standard features include automat-ic compensation for drift, a capacity toseek out peaks for given elements, andthe ability to check and correct errors inoperating parameters. The instrumentmay be programmed for unattended oper-ation. The display system includes side-by-side CRT image comparison and athird CRT for automatic photorecordingwith digital exposure control. The com-puter-controlled spectrometers have a500-millimeter Rowland circle, a 750x-ray takeoff angle, and a linear crystalpath. Cambridge/Imanco. Circle 671.
Volumetric Stirring Bar
The Speci-Volume Spinbar enablesthe user to stir controlled volumes mag-netically. The Teflon-encapsulated mag-netic stirring bar has its own volume,accurate to two decimal places, in raisednumerals. This allows one to com-pensate for the volume displaced by thestirring bar in precise calculation. Bel-Art Products. Circle 667.
Titration System
The DTS 633 is a digital potentiomet-ric titrator. It automatically identifiesand records endpoints. During opera-tion, a computer monitors reaction
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speed, calculates optimum incrementvolumes, and controls their addition tothe sample. It ensures that chemical equi-librium is attained prior to each additionof titrant. The measured volume and po-tential values are retained in memoryand simultaneously used to calculate thederivatives of the titration curve. Lon-don. Circle 665.
Nephelometer
The model 40 features capped sam-ple cells to minimize contamination,a sample-viewing door for visual in-spection of the illuminated cell, and 2-minute warm-up. Applications includedaily monitoring of turbidity in drinkingwater systems. The device is calibratedin nephelometric turbidity units and inaybe read from a panel meter or interfacedto a recorder. A continuous-flow attach-ment will render the model 40 suitablefor continuous-monitoring applications.Turner Designs. Circle 669.
Autonnated Radioimmunoassay System
The Automated RIA System performsassays with a magnetic separation andsubsequent measurement of radio-activity bound to antibodies with a count-ing technique. The count is passed on toa calculator in order to determine theconcentration of antibody in an individ-ual sample from the patient. Results areprocessed in 15 minutes. In addition tostandard laboratory assays, the systemrapidly performs high-volume assays inthe clinical setting. The system may bedesigned as a bench-top or stand-aloneconsole. Technicon. Circle 670.
Literature
Microscopy from the Very Beginningis a 65-page exposition by an expert thatdetails basic design and operation of mi-croscopes, the behavior of light in opti-cal systems, and the kind of accessoriesavailable for today's instruments. $1.50per copy. Carl Zeiss. Circle 675.Laboratory Products is a catalog of
items for filtration and chemical separa-tion with information about applications.Whatman. Circle 676.Vacuum Fittings includes flanges,
clamps, centering rings, reducing rings,hose nipples, and others in standard,reducing, and tapering configurations.Alcatel Vacuum Products. Circle 677.Amino Acid Analysis describes the re-
sults achieved in 30 minutes with the D-
14 JANUARY 1977
500 analyzer. Durrum Instrument. Circle678.Environmental Rooms details a line of
prefabricated, modular, walk-in modelsfor control of temperature, humidity,and light. Hotpack. Circle 679.Spectrophotometers lists the Super-
Scan series of five ultraviolet-visiblelight instruments. Accessories are includ-ed for the design of analytical systemsaround the devices. Varian InstrumentDivision. Circle 680.Mass Spectrometer is devoted to a
unit for the analysis of the compositionofgases in vacuum systems. The Quadru-vac Q200 is a quadrupole gas analyzer
with a one-piece ceramnic mass separa-tor. Leybold-Heraeus. Circle 681.Microcomputer Product Catalog in-
cludes software, development systems,and hardware items and peripheral appa-ratus. Control Logic. Circle 682.Chemical Terms, Sanyo's Trilingual
Glossary offers English, Japanese, andChinese lists with formulas where appro-priate. Sadtler Research Laboratories.Circle 683.Biochemicals includes approximately
six dozen new products among an exten-sive inventory of items previously of-fered. ICN Pharmaceuticals, Life Sci-ences Group. Circle 684.
free cuvettes I'll get wth each Junior 111 order.
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PRODUCTS and MATERIALS
DOI: 10.1126/science.195.4274.211 (4274), 211-213.195Science
ARTICLE TOOLS http://science.sciencemag.org/content/195/4274/211.citation
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trademark of AAAS. is a registeredScienceAdvancement of Science, 1200 New York Avenue NW, Washington, DC 20005. The title
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