Get ultraspeed performance at

superspeed cost with the new

Sorvall®RC-5B centrifuge system.The Sorvall RC-5B Super-

speed Refrigerated Centrifugesets a new standard for range ofapplications. With the 12 rotorsdesigned for it-includinghighly efficient verticalrotors* -it constitutes a versa-tile system that can do manyjobs, such as denisity gradientstudies, previously handled

only by more costly ultracentri-fuges. A graphic example of theultraspeed capabilities of theRC-5B with a vertical rotor is thecomparison shown here, ofseparations achieved for a cow-pea mosaic virus preparation.

The RC-5B has a built-inAutomatic Rate Controller toprovide soft starts and stops.

The electronics also includesautomatic temperature, speedand time control. Sorvall GyroAction Direct Drive requiresonly "eye balancing" of tubecontents. Other featuresinclude easy programming,"fail-safe" control system andthe unique "Noisuppressor"sound-damping system. AndDuPont's 5-year warranty onrefrigeration components isunmatched in the industry. Acomplete line of tubes, bottlesand adaptors is available for theRC-5B.

111'- J'/IFor more information on

the Sorvall RC-5B system, writeto DuPont Company, Room36323, Wilmington, DE19898. 'U.S. Patent 3,998,383

With Sorvall Centrifuges the spin times are changing.

Sorvall®CentrifugesCircle No. 54 on Readers' Service Card

Separation of Cowpea MosaicVirus Particles (Yellow Strain)

Superspeed Centrifuge (RC-5B)Vertical Rotor (SV-288)Timer Setting: 4 Hours

- Speed: 20,000 rpm

0.0

0.5 OD

Top Bottom

Ultracentrifuge (OTD-65)Swinging Bucket Rotor (AH-627)

Timer Setting: 5 HoursSpeed: 27,000 rpm

Top BottomRate-zonal separations using 1-mi sample volumes.

1040% sucrose gradients (33 ml) at 40C.Peaks at 95S and 115S.

12 MAY 1978

I

I

W. ., S- a Im oFF

599

tmom the Inader in systems.

When temperature control is criti-cal, Neslab baths and circulators,immersion coolers and refriger-ated recirculating heat exchangersare the answer. For precision,reliability, ease of operation andeconomy, no other laboratoryliquid systems can match Neslab'sprice/perfonrance standards.

The statuitheartinconsa

emperture bathsThree major technical advanceshave made Neslab's constanttemperature baths and crculatorsthe most advanced availablewith temperature ranges of + 250down to - 1000 C.

Multi-point sensing probesvirtually eliminate temperatureovershoot and lag. A proportionalIC controller provides unmatchedshort term control without longterm instability or drift. And thenew variable flow circulatingpump will run continuously foryears in a wide range of tempera-tures, bath fluids and viscosityconditions.

ap water coolnkatum-off.

A tap water cooling system with a4 gpm flow rate wastes 2,000,000gallons of water per year- ifyou can get that much. It alsocreates problems with plumbing,waste water disposal, unstablepressures, temperature variationsand corrosion. All ofwhich can costmoney and cause down-time.

Neslab's Coolflow Recircu-lating Coolers are a beautiful alter-native. They are quiet, compactand extremely reliable. One to4 gpmmodels range in price from asurprisingly low $965 to $1220.Which means the Coolflow caneasily pay for itself within a year.

_M Mai_

SNmoAt_bp

If you use LN2 (liquid nitrogen) orC02 (dry ice) as coolants, youknow how expensive they are.And how difficult to handle andstore.

What you may not know isthat Neslab's CryoCool Refrigera-

Circle No. 92 on Readers' Service Card

tion Units can do the same job.Better. More efficiently. Withvirtually no bother. And at far lesscost.

CryoCool units are so efficientand reliable, they often pay forthemselves in a matter of months.And they are designed to run con-stantly for years with littleattention.

Write for our new catalogs on con-stant temperature baths and circu-lators, immersion coolers, andrefrigerated recirculating heat ex-changers. Feelfree to call ifyouneed technical assistance with anapplications problem.

NESLAB INSTRUMENTS, INC.871 Islington St.

Portsmouth, N.H., U.S.A. 03801Telephone (603) 436-944

Telex: 940 830.12 MAY 1978 603

Customremanufacturedsterilizers...

...can save you as much as 40% off the list priceof a new steam or ethylene oxide unit.

Engineered to your specifications, with customremanufactured vessel and door, new con-trols, operating parts, steam generator and fittingsspecified for your applications. Three year perform-ance warranty-longest in the industry.

We have a model, size and type to meet everyi~jJ sterilizer need, plus a line of new bulk sterilizers.

Call or write for our brochure.

Scientific Industries, Inc.70 Orville Drive, Airport International Plaza, Bohemia, New York 11716, 516/567-4700

Circle No. 51 on Readers' Service cardCircle No. 128 on Readers' Service Card

IVlk In Inv rtfp nas

Circle No. 69 on Readers' Service Card

~~~~~~0 1

| 3 CHEMICAL & RADIOISOTOPE DIVISION2727 Campus Drive

J* Irvine, California 92715THE FIRST STEP IN QUALITY RESEARCH

12 MAY 1978 605

GRAPHICS AND PERSONAL COMPUTING

"tUntil now, we'dbeen mistaking access to

processing,,for accessto answers.

Problem: It takesmore than a desktopprocessor to organizeoutput into its simplest,most usable form.A personal computer canshave timeshare expenses, butdo nothing about trimming thefat off alphanumeric answers.You can give up the power of amainframe without the promiseof more intelligent, instantlyvisible data.

Solution: Tektronxw4051. The one desktopunit that shapesInfonnation into usablegraphics.

Ir ktmnixeICWM TMr TE

From interfaces and firmware to hardcopy units, data storage devices,printers, plotters, graphic tablets andproven software, Tektronix providesplug-in capability to customize the4051 to your special needs.

A graphics answer is the mostconcise of all possible solu-tions. The 4051 can eliminatethe hand-plotting and mentalgymnastics that users of alpha-numeric-only systems take forgranted. It lets you instantlyunscramble data and inter-actively experiment with graphs,charts, maps and models. Withexceptional simplicity. Withalmost the speed of thought.

You command up to32K of off-line processingpower. With a graphicallybeefed-up BASIC language.With complete editing and ver-satile graphic-oriented software.

You can tackle big pro-grams on-line in any language,

OEM prices availableCopyright © 1977, TektronixAll rights reserved

store data on built-in mag tape,and generate graphic reports-all at your own pace.

The 4051: Its Graphicskeep working when othersystems quit. Yet it can payfor itself in less thana year in timeshare savingsalone. Call your local TektronixSales Engineer, or write:

Tektronix, Inc.Information Display GroupPO. Box 500Beaverton, OR 97077Tektronix Datatek N.V.PO. Box 159Badhoevedorp, The Netherlands

Get thepicture.Getstraight tothe point.

Circle No. 11 on Readers' Service Card

TEKTRONIX 4051

STThcThisconmarsoliSBI

lathematics &itatisticshe Four Color Problemomas L. Saaty, Paul C. Kainens is the first book published that provides not only a

itemporary account of the Four-Color Problem ofp coloring, but also examines the recently developedution to this famous mathematical conjecture.N 07 054382 8 224pp 1977 $22.00

INr r McGraw-Hillr. r International

I . n Book Company

Creation and AnnihilatloOperatorsJohn AverySBN 07 002504 5 221pp 1977 $23

_ ~ ~ ~ ,M_

The General Linear Model Roaan Spectroscopyymond L. Hortonitten to provide a clear understanding of the

SBN 07 038675 7 284pp .5C1977 $29

commonality underlying all analysis of variance and -

regression analysis procedures, and an understanding A GUl.e to re vnmanof general linear model procedures, the basic goal ofthis book is to show that a wide variety of popular 6agram itechniques or designs of experiments are all examples

of a general linear model.

SBN 07030418 1 274pp 1978 $24.50 any o y ro iem. *L* Richard D. Mattuck

SBN 07 040954 4 429pp 1976 $19.5(

DIfferential Equations L ife Sc i e nces

q

D

D

1977 $28.50

Information Theory WithNew ApplicationsSilviu GuiapuSBN 07 025109 6 439pp 1977 $34.00

'hysics &ChemistryDm the International Series in Pure andplied Physics:

Grou Theoryand GeneralRelativityM. CarmeliThis highly topical treatise contains not only an

extensive discussion of the theory of general relativityfrom the point of view of gauge fields, but also bringstogether, in one volume, many scattered original works

on the use of group theory in general relativity theory.SBN 07 009986 3 391pp 1977 $29.00

Phase Transitions in SlisC.N.R. Rao, K.J. RaoProviding a unified picture of the wide area of phasetransitions, this book covers basic theory, structural

aspects and material properties. Case studies of several

systems illustrate how phase transitions are analysed in

real situations. The important literature references are

cited, and results from various techniques discussed.

SBN 07 051185 3 329pp 1978 $34.50

All prices are approximate. These titles are available through your usual _supplier, your local McGraw-Hill representative/company, or LenoreStanoch, Room 3046-55, McGraw-Hill International Book Company,1221 Avenue of the Americas, New York, New York 10020, U.S.A.

Electron Microscopy inHuman MedicineA Series in 11 VolumesEditor: Dr J.V. JohannessenVolume 1: Instrumentation and TechniquesThis 11 -volume series is the first published attempt tocover all aspects of the broad subject of ElectronMicroscopy. Volume 1 serves as a basic introduction tothe techniques used in ultrastructural human pathology.It stresses those areas in which the inexperienced mayencounter problems.SBN 07 032501 4 344pp Aug. 1978 $48.00

Volume 2: Cellular PathobiologyThis volume covers the general morphology andfunction of cell and tissues as well as the reactionpatterns tollowing injury. It should serve as a basis torthe rest of the volumes. It includes a comprehensivetreatise on metabolic and storage diseases, linking thebasic aspects with clinical disease. Micrographs showthe use of the electron microscope for the diagnosis ofdiseases.SBN 07 032502 2 272pp Feb.1978 $39.50

Labelled Antibodies inBiolgy and MedicineAurel FeteanuThis monograph is the first to examine in depth each ofthe four methods of antibody labelling - fluorochrome(the immunofluorescent method) radioactive isotopes,

ferritine, and enzymes which have extraordinarysignificance in the fight against epidemic diseases.SBN 07 020643 0 411 pp 1977 $39.50

ml-mIBCIIKADVLANCEDPROGRAM

12MY17 iceN.6 n edr'SrieCr 8

Ra'Wri

MESB

artin SchechterIN 07 055193 6 246pp

FrcAp

EL__

I

N

12 MAY 1978 Circle No. 68 on Readers' Service Card 683

11 wI

Synthesized completely by enzymaticprocedures for:Nick translating DNA for hybridization studies';Labeling the 3' end of DNA for sequencing,using bacteriophage T4-inducedDNA polymerase2

Deoxycytidine 5' triphosphate, tetra (triethyl-ammonium) salt, [a-32P]- 1000-3000Ci/mmolEthanol:water, 1:1, shipped in dry ice.NEG-013H 500,Ci 1 mCi1. Mackey, et al., Biochemistry 16,4478-4483 (1977)2. Soeda et al., PNAS 75,162-166 (1978)Prepared monthly: Call or write for currentschedule. Send for new Nucleotides Brochure.Not for use in humans or clinical diagnosis.

IeI New England Nuclear549 AlbanyStreet, Boston, Mass. 02118Call toll-free: 800-225-1572(In Massachusetts and International: 617-482-9595)

NEN Chemicals GmbH, Dreieich, W. Germany; NEN Canada Ltd., Lachine, Quebec

Circle No. 83 on Readers' Service Card

I HOEBATORSeconomicaI automatic tabIetoDs

6.1 cu ft . . . mechanically-convected orwater-jacketed . . . 0 to 20%CO2 ... digital.readout . . . to 60C +0.2C ... 96% RHWhy buy more incubator than you need? Hotpack com-bines tabletop economy with built-in, solid-state Mini-Mode C02 controls. Digital set and constant display inbright red .55" digits. Automatic 2-stage CO2 recovery.Standard inner glass doors. All stainless steel construc-tion. Heated outer door and self-decontamination standardin Model 352101.

1850 eithermodelf.o.b.

Phila.. Pa.

HOTPACK CORPORATION (215) 333-1700-WATS 800-523-3608COTTMAN AVENUE AT MELROSE STREET, PHILADELPHIA, PA. 19135

Circle No. 100 on Readers' Service Card

Circle No. 90 on Readers' Service Card12 MAY 1978 685

TEXASINSTRUMENTS

Model Your Cost Model Your CostTt 59 $214.95 Tt 58/59 Libraries 28.95

PC 000A 146.95 TI 1680 25.95

Tt 58 96.95 Tt 25 LCD 26.95

TI 57 62.95 Money Manager 19.95Programmer 48.95 TI 1700 Data Clip 29.95SR 51-2 49.95 Data Man 22.95

TI 55 49.95 Liftle Professor 12.95TI 1790 Datachron 43.95 TI 30 SP 18.95

MBA 63.95 TI 25 LCD 26.95Bus Analyst 11 34.95 TI 5040 P/D 9895SR 40 23.95 TI 5050 M 83.95TI 50 LCD 29.95 TI 5015 64 95TI 2550-3 25.95 TI 5100 43.95TI 1050 11.95 Tl 1025 10.95

TI Accessories at discount pricesOne free TI 503-1 digital watch with single purchase order of $650+ from this ad.

All TI units come complete, fully guaranteed by TI.

HEWLETl-PACKARDModel Your Cost HP 67 354.95 SUPER SPECIALS

HP 97 594.95 HP 91 259.95 HP 25 84.95HP 92 49495 HP 10 137.95 HP 21 55.95HP 80 233.95 HP I9C 273.95 HP 27 114.95HP29C 154.95 HP25C 125.95 HP22 84.95HP accessories at discount prices One year guarantee by H-P. All units come complete.

We will beat any deal. Try us at any time.

SPECIALSModel Your Cost Model Your CostNorelco #185 99.95 PearlcorderAll models speeds lrom 129.95Norelco-Phrilips 95 149.95 RCA Selectavision 799.95Norelco #88 242.95 Sony Betamax 8200 Call usNoreico NTI 164.95 Zenith Video Recorder 829.95Norelco #97 Dict/Transc 298.95 Sony TVs. all models Best dealNonelco #98 Dict/Transc 409.95 RCA Vs. all models lrom 79.95Norelco Mini Cassettes 2.95 Zenith Ts, all models from 87.95Craig 2706A-2625-2629 Call us 3M dry photocopier 77.95Sanyo TRC 8000A 199.95 Atari Video Game 159.95SanyoTRnC 8010OA 159.95 Victor printer 305 99.95

No one can beat Olympic Sales Co. prices and fast service. Try us.Prices are f.o.b. LA. Goods subject to availability. Ask for our famous catalog.

We will beat any price if the competition has the goods on hand.Add $3.00 for shipping hand-held calculators. CA residents add 6% sales tax.

AL -__

Circle No. 101 on Readers' Service Card

New Enzyn..

ILA%Io% ev 1

Circle No. 4 on Reoders' Service Card

Forogyhas resultedyour efforts

s.... $45.00

$16.00

h 09180734 Polynucleotide Kinase

(T4-infect E..: co1i), 80% pure'0+.''t..100 uni $72.00

0880 RNA Ligase (T4-infeted .. $60i)"RNase Free" ~.... $60.00

0870 DNA Ligase (T4-infected. E. i')Suitable for Recombi.1ning 100 j-is.... $50.00

0912 NUCLEASE,MrUNG S'AN...... ts $45.00

These producm be shipped cold&*.sltedh container and

refrigerant charge $6.00. May aireight shipment.

RLblochemiccals,in.1037 WEST McKINLEY AVENUE, MILWAUKEE, WNIS. 53205Call (414) 347-7442 Telex 26881

Circle No. 130 on Readers' Service Card

neruuu.a-iun*a uos a mimul is vi*UTmugprecision glass and quartz cells.Standard * Flow-through * Constant-temperatureAnaerobic * Special DesignsAlso available-ULTRAVIOLET LIGHT SOURCESDeuterium Lamps* Mercury Vapor LampsHollow Cathode Lamps* Power Supplies

XI E LLMK Write for literatureBorough Hall Station

E L L S, I N C. Jamaica, New York 11424___________________________Phone (212) 544-9534

Circle No. 6 on Readers' Service Card

THE FRANKLIN INSTITUTE PRESSBox 2266

Phila., Pa. 19103SOLAR ENERGY SERIES: Solar Collector Design,Solar Cooling, Thermal Storage, Wind Energy, Biocon-version: Fuels from Biomass, High Temperature Ther-mal Energy Storage, Winds and Wind System Perform-ance

CLINICAL SERIES: Viral Hepatitis: Etiology, Epi-demiology, Pathogenesis and Prevention, Modern Anes-thesia in Dentistry Vos. I and II, Neoplasm Immunity:Solid Tumor Therapy

JOURNALS: Cancer Therapy Abstracts, Carcinogene-sis Abstracts, Powder Metallurgy Science and Technol-ogy, Nutrition and Cancer: An International Journal,Bulletin of Magnetic Resonance, Powder MetallurgyScience and Technology

topics from theEASTERN ANALYTICAL SYMPOSIUM, 1977

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