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CA SELECTS Will Keep You InformedWe've added more new topics to the CA SELECTS series. See For Yourself,Now there are 80 reasons to look into CA SELECTS, Get a FREE Issuethe current-awareness service from the publishers of of CA SELECTSCHEMICAL ABSTRACTS.

To receive a FREE issue of CA SELECTS, indicate theCA SELECTS brings you. . . topic(s) pertaining to your interest from the list below.

9 Informative abstracts of current chemistry-related We'll also send complete ordering instructions but youliterature won't be\obligated to order a subscription.

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,~p~cTS Now- 80 Topics* Please send me my free issue(s) of CA SELECTS, covering the topic(s)* I have indicated below. Also send complete ordering instructions. I

O Adhesives* Ol Analytical Electrochemistry understand this request does not obligate me to order a subscription.

El Animal Longevity & AgingEl Anti-inflammatory Agents & Arthritis O Herbicides O PsychobiochemistryO Antitumor Agents O High Speed Liquid Chromatography E Radiation ChemistryEl Atherosclerosis & Heart Disease C1 Infrared Spectroscopy (Organic O Raman ,pectroscopy uEl Batteries & Fuel Cells Aspects) * O Recovery & Recycljng pf WastesE Biogenic Amines & the Nervous System E Infrared Spectroscopy (Physicochemical O Silver Chemistry0 Biological Information Transfer Aspects) * O Solar EnergyO Blood Coagulation E Insecticides Q Solid & Radioactive Waste TreatmentLi Carbon & Heteroatom NMR* E Ion Exchange O Solvent ExtractionEO Carcinogens, Mutagens, & Teratogens E j-Lactam Antibiotics E Steroids (Biochemical Aspects)El Catalysis (Applied & Physical Aspects) E Liquid Crystals E Steroids (Chemical Aspects)El Catalysis (Organic Reactions) El Liquid Waste Treatment E Substituent Effects & Linear FreeEl Chemical Hazards, Health, & Safety E Mass Spectrometry Energy RelationshipsEl Coal Science & Process Chemistry E Metallo Enzymes & Metallo Coenzymes E Surfare Chemistry (PhysicochemicalEl Colloids (Applied Aspects) E Moessbauer Spectroscopy Aspects) IEO Colloids (Macromolecular Aspects)* E New Books in Chemistry E Thermochemistry IEl Colloids (Physicochemical Aspects) E Organic Reaction Mechanisms E Trace Element Analysis IEl Computers in Chemistry E Organofluorine Chemistry E X-RayAnalysis&Spectroscopy IEl Corrosion E Organophosphorus Chemistry E Zeolites * I

* E Crystal Growth E Organosilicon Chemistry 1* E Detergents, Soaps & Surfactants E Organo-Transition Metal Complexes * New as of July 1979 I* E Drug & Cosmetic Toxicity E Paper & Thin-Layer Chromatography 1* E Electrochemical Reactions E Photobiochemistry M C

E Electrodeposition E Photochemistry Mail Coupon To:El Electron & Auger Spectroscopy E Pollution Monitoring Chemic?l Abstracts ServiceEl Electron Spin Resonance E ProstaglandinsI (Chemical Aspects) El Proton Magnetic Resonance *MreigDprmn M

* E Energy Reviews & Books P.O.Box3O12 II E Engine Exhaust Columbus, Ohio 43210 U.S.A. I* E Environmental Pollution I

I O FlammabilityI E Flavors & Fragrances Name _

* Ol Food Toxicity _I 0 Forensic Chemistry Title II 0 Fungicides .* 0 Gas Chromatography Organization

0GaseousWasteTreatment Addr ess__ .* 0 Gel Permeation Chromatography IE0 Heat-Resistant & Ablative Polymers Im1m6 m mm m mmm m m m m m m m m m m m mmm m m mn",A12 OCTOBER 1979 Circle No.3on Readers'ServiceCard o$9 lVj) 141

Isyourworkat therig edge ofimagnationhen Rolexwants to'you change the world.

The five Rolex Awards for Enterprise,in the sum of 50,000 Swiss francs each, areconferred to provide financial help for proects which seek to break new ground intheir particular sphere, and which capturethe spirit of enterprise shown by Rolex and KRolex owners.

The kind ofenterprise that takes a manlike Julian Nott to world record-breaking -altitudes in hot-air balloons, Sir EdmundHillary to the top of Everest. Or Dr. BillLasley, a previous Awards for Enterprise winner,into new methods for saving and breeding rarespecies of birds.

These people epitomize the spirit ofenterprise. The 1981 Rolex Awards for Enter-prise seek others like them whose proposals forprojects fall into any of three general categories:

APplied Sciences and Invention. Projectsinvolving a step forward in research, experimen-tation, or application in the general field of

science and technology.Exploration and Discovery.

Projects involving explorationor discovery will be concerned

* F primarily with venturesomeundertakings or expeditions,and should seek to inspire our

" imagination, or expand ourknowledge of the worldin which we live.

The Environment. Projects inthis category will be concemed pri-marily with our environment, andshould seek to protect and preserve.or to improve, the world around us

In addition to the 50,000 Swis&francs, each of the five winnersWill receive a specially inscribed

.- > Rolex Chronometer.For an Official Application

Form with detailed rules and con-ditions write to:

The Secretariat, The Rolex Awards for Enterprise,P 0. Box 178, Dept. 300,1211 Geneva 26, Switzerland.

Send your name andaddress and state the generalnature of the project youare considering. C

Entries must then besubmitted in English onthe Official Application.Form and reach the Secretariatbefore April 30th, 1980.

The Rolex Awards for Enterpriseselection process is exacting and arduous.Winners will be notified in December 1980,and their names will be published in theintemational editions of Time and NewsweekLb.. magazines in May 1981.

ROLEX

The Rolex Oyster Perpetual Day-Date ChronometerCircle No. 9 on Readers' Service Card

12 OCTOBER 1979

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The Universal keeps on growing

Now over1,500 accessories

"The most remarkableobjectives"

The Zeiss Universal Microscopewas designed to grow Twenty-year-old Universals will accept thelatest accessories for qualitativeand quantitative microscopy andfor photomicroscopy Today thoseaccessories number over 1,500-the most for any microscope.No matter what youwant to do in Micro-scopy, you can do itwith a Universal.

The latest development is a line ofPlan-Neofluars. One expert raved,'The numerical apertures for suchversatility are nothing short of phe-nomenal and the lenses live up tothe name Zeiss in every respect."Use them with water, oil, glycerin-with or without cover slips.

The great name in optics

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fi;00, d.0

Carl Zeiss, Inc, 444 5th Avenue, New York, NFY. 10018 (212)730-4400. Branches: Atlanta, Boston, Chicago, Houston, LosSan Francisco, Washington, D.C. In Canada: 45 Valleybrook Drive, Don Mills, Ontario, M3B 2S6. Or call (416) 44

Circle No. 121 on Readers' Service Card

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The SPEED VAC (Pat Pending)EVAPORATOR/CONCENTRATOR isnow widely used with theseMlcrocenttffuge Tubes to minimizesample loss and maximize sampleconcentration. A combination of rotaryaction and vacuum application accountfor the high efficiency volume reductionof the sample.A wide variety of rotors is available to handlea wide range of sample sizes from a fewmicroliters to ten milliliters and more.

Savant can supply the entire systemIncluding the SPEED VAC CONCENTRATOR,the Refrigerated Trap and the VacuumPump as well as many accessories whichmakes the laboratory completely operationalin a short time. The entire system does nottake up valuable laboratory space. Send forliterature today.SAVANT INSTRUMENTS, INC.221 Park Ave., Hicksville, N.Y. 11801(516) 935-8774

Savant

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The SPEED VAC CONCEN-TRATOR will yield virtually100% sample recovery withEluates, Hydrolysates, Extracts,Dialyzed solutions.

i fll6 HIImum*SUEAUH MIOMFOR*wuwu *tSESExcellent when preparingsamples by Derivitization,GLC, HPLC, Amino AcidAnalyis, Electrophoresis andChromatography.

Circle No. 11 on Readers' Service Card

Tested for binding and displacementin a specific RIACarrier-free, monoiodinatedFresh monthly

Somatostatini -tyrosine [1251]-,monoiodinatedShipped frozen in 0.05M sodium phosphatebuffer (pH 7.5) containing a stabilizer andproteolytic enzyme inhibitor.NEX-129 10,iCi 2x10,iCi 50,uCi 2x50,uCi

Not for use in humans or clinical diagnosis.

I i~.New England NuclearI® 549 Albany Street, Boston, Mass. 02118

Call toll-free: 800-225-1572(In Massachusetts and International: 617-482-9595)

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

Circle No. 114 on Readers' ;ervice Card

Circle No. 56 on Readers' Service Card

L

23712 OCTOBER 1979

High-Purity,Bacteria-Fr,Endotoxn-Free WinterProduced ah Stored..In Your Lab

The patented,' continuous duty, KontesHigh Purity Water System makes cleanroom water production unnecessary.Now, water suitable for tissue culturegrowih, chemical and biological researchstudies, pharmaceutical parenteralsolutions, and other intravenousadmixture and solution compoundingapplications, can easily be produced andstored in a working lab environrmTent.2This Kontes System was designedand successfully tested at the N.I.H. inresponse to production and productstorage problems associated with otherbiomedical water delivery systems.Send for complete specifications andprices. Manufactured with Kontestquality,of course."Patent No. 4,089,7492Karamian, Narbik A., American Laboratory, March 1976

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Vineland, NJ 08360 (609) 692-8500

tgional Distributors: KONTES OF ILLINOIS, Evanston, 11. * KONTES OF CALIFORNIA, San Leandro, Calif.

Circle No. 116 on Readers' Service Card

Unitron's

Polarizer brCertain types of transparent speci-mens have structural detail onlyvisible when viewed by polar-ized light. For these applications,the Unitron MPS-3 has all thenecessary features of a truepolarizing microscope ...Bertrand lens for observinginterference flgures, analyzerand polarizer, compensators,strain-free objectives, andmore. Ask for free literaturedescribing Unitron's MPS-3polarizing microscope. Or askus to arrange a no-obligationdemonstration by a nearbydealer.Unitron Instruments, Inc.101 Crossways Park WestWoodbury, NY 11797, U.S.A.Phone (516) 364-8046

UNITR N The value lineSubsidiary of Ehrenreich Photo-Optical Industries, Inc.

Circle No. 99 on Readers' Service Card

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II Casgin, [methyl-I4C] methylated a -

Collagen, [methyl-'4C] methylated-NEC-735NEC-729

EBastin, [methyl-'4C] methylated soluble- NEC-734Methemoglobin, [methyl-14C] methylated- NEC-728Protein, [14C (U)]-( E co/i) NEC-737

Contact NEN for detailed procedures developed ormodified by our staff scientists.

Not for use in humans or clinical diagnosis.

(g' New England Nuclear549 Albany Street, Boston, Mass. 02118Call toll-free: 800-225-1572(In Massachusetts and Intemational: 617482-9595)

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

Circle No. 129 on Readers' Service Card

A desert environmentor a tropical rain forest,.nd anywhere in between...Percival is versatile!

You may not need a desert environment inyour lab but Percival has the experience, theknow-how and the product line to serve yourspecific needs. Whether it's a simplebiological incubator or a highly sophisticated

plant growth chamber, Percival can supply it

for you. A chamber can easily be tailored toyour requirements. We will prepare arecommendation to fit your needs, whether

they be table models or giant walk-ins.Consider your requirements carefully and then

contact us. Write today for more informationand the new complete Percival catalog.

CIrce No. 8 on Rders' Service Card12 OCTOBER 1979 241

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Extraordinarily specific and sensitive.Superior to conventionally produced antisera.Monoclonal Anti-Thy 1.1In 0.25ml ascites fluidTiter: 10-5 NEI-002Monoclonal AntI-Thy 1.2In 1ml ascites fluidTiter: 10-6 NEI-001In lml buffered ascites fluidTiter: 10-5 NEI-001ANot for use in humans or clinical diagnosis.

NewEngland Nuclear549 Albany Street. Boston, Mass. 02118Call toll-free: 800-225-1572(In Massch -t andi tntarmtinal- R17_M_8Q.1

NEN Chemicals GmbH. Dreieich, W. Germany; NEN Canada Ltd., Lachine, QuebecCircle No. 128 on Readers' Service Card

ISCO's electrophoresis power supplies offerconstant power, current, or voltage. They can pro-vide you with faster separations and sharper zonesthan you can get from conventional equipment,especially for isoelectric focusing and high per-formance discontinuous buffer techniques. Powercan be continuously indicated: there's no need tomultiply current and voltage readings to determinewattage.The Model 494 even has an automatic cross-

over circuit that switches control to a different modewhenever a preset voltage, current, or power limitis reached.

For more information, phone toll free: (800)228-4250 (continental U.S.A. except Nebraska). Orwrite Instrumentation Specialties Company, P.O.Box 5347, Lincoln, Nebraska 68505.

Instruments with a differenceCircle No. 43 on Readers' ServIce Card

a ~~~~look like6

If so, you need our attractive Science Binders to keepyour copies of Science in good condition, and availablefor quick, easy reference. Simply snap the magazinesin or out in a few seconds-no punching or mutilating.They open FLAT-for easy reference and readability.Sturdily constructed, these maroon imitation leather bind-ers stamped in gold leaf will make a fine addition toyour library.Science Binders hold one three-month volume of Science.They have a 3-inch back and 14 fasteners. $6.00 each.Four binders. $22.00. (Please allow 6 toS weeks for delivery)

For orders outside the United States add .60 cents perbinder. Imprint: name of owner, year of issues (for exam-ple: 1972-4 or vol. 178). add $1.00 per binder.

Send to "Binders"'AMERICAN ASSOCIATION for theADVANCEMENT OF SCIENCE1515 Massachusetts Avenue, N.W.Washington, D. C. 20005L I

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