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Guide to Advertised ProductsIn addition to the products advertised in this issue, the following items have been featured recently. Science provides this
list to afJord readers a further opportunity to receive information on these books, instruments, materials, and services.Scan the list and circle the Readers' Service numbers for those of interest. Use the card on either page 662A or page662C. To see the original advertisements, refer to the issue and page of Science indicated.
Product and Source Issue Page Circle Product and Source Issue Page Circle
Proteinase K isWhen you need another Available only from
Edison or Einstein,thistool jelps.you aE aora or es, n(
Now you can keep in touchwith the outpouring of theworld's best technical andscientific brains.
Lockheed's Dialog retrievalsystem puts their work atyour fingertips for only a fewdollars. Take INSPEC(Science Abstracts). It alonehas more than 700,000abstracts covering electronics,electrical engineering,physics and computers. Otherdata bases include NTIS,U.S. Government ReportsAnnouncements; ChenmicalMarket Abstracts; andCOMPENDEX (EngineeringIndex). A typical search costsas little as $10, and takes onlya few nminutes.
Dialog helps you keepfronm reinventing the wheel,helps you use publishedknowledge and informationof thousands of others as aspringboard for your ownefforts.
Dialog is easy to use. Itonly takes a terniinal and atelephone. And it only takesa letter or a phone call toget imore infornmation.Contact Barbara Ellis,(415) 493-4411, Ext. 45635,Dept. 15-50, Bldg. 201,3251 Hanover St., Palo Alto,Ca. 94304. In Washi ngton,D.C., phone R. CapUto,(202) 872-5971; in New York,R. Donati, (212) 682-4630.
LOCKHEEDINFORMATION
SYSTEMS
Circle No. 484 on Readers' Service Card
I
c.
/Proteinase K is useful in RNA, DNA isolationand for serological purposes.Proteinase K is chromatographically purified,and lyophilized. Also available as a carrier-bound enzyme.Send for literature, specifications, applica-tions and prices.Circle No. 468 on Reoders' Service Card
EM CrystallineNinhydrin isEasier to Use
Easier to weigh, easier to dissolve. EM offersthree forms: crystalline, finely crystalline oras a spray reagent. For detection and deter-mination of lower peptides, free amino acids,Vitamin B1, protein nitrogen, and for TLC.Send for a useful applications brochure, pricesand specifications.Circle No. 469 on Readers' Service Card
EM Reagents'
EM Laboratories, Inc.associate of E. Merck, Darmstadt, Germany
5(9) Exe.utave Boulevard. Elmsford. New York 10523
Telephone 914, 592-4660
I1
Circle No. 471 on Reoders' Service Card
TheWillemsPolytron"homogen-
izer isunlikeany mixer you've ever used. Itworks on a unique principle-kinetic plus ultrasonic energy.And it often succeeds whereother instruments fail.
Homogenization by soundwaves means that tissues arebroken down quickly to sub-cellular level without destruc-tion of enzyme activity. You'dbe hard-pressed to do thatwith other kinds of mixers.
In the applications field,the Polytron has proved so ef-fective in inducing physicaland chemical change that ithas already revolutionizedmany procedures. Whether itbe for dispersing, homogen-izing, emulsifying or disrupt-ing, a Polytron is available inthe size to"meet your specificrequirements.
Contact us if you have anyquestions. Both literature anda demonstration are availableon request.
Brinkmann Instruments, Inc.Cantiague Road,Westbury, L. I., N.Y. 11590Brinkmann Instruments
307H nkin;i in rii WilimeSeinerC ATi OI!:,ITeIdsnCc Iric II L:qL
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Up to 41,300xG ... 4-litre capacity...800 ml/min. flowrate. All yours with Lourdes Beta-Fuge And builtto take it day afterday. Designedwith your people inmind-,that'swhy-the front controls. ra iIThe easier, fasteroperation. Thespace-saving,time-saving slidingdoor. LourdesBeta-Fuge. Up withcapacity. Downwith downtime. -mSee your Lourdesdealer, or write,
Vernitron.'MEDICAL PRODUCTS INC5 Emoire Boulevard. Carlstadt. New Jersev 07072
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SC -I N(I'-, V I s'r
.AAAS SOCIO-PSYCHIOLOGICAI PRIZE
1 hronIth the Ce(neCOsits ot the late Ar-t hruL FBcIItle theic A A.i oftl ers Ia IIIannnl pirLize of1 1GOP)(Itfor aimentorioLns paper that f nrthler-s uindcrstanidlnof theC pChchoo'iaFlsocial cnltrral hehas w1 ot hnL-man heinitsThe .AAXAS Soro 1Ssc hological Pr-izc is initenided
to CIeoniCrLFC st ndics arid anakLses of social hehas1 o1rhaseti 0on Cxl erCtl\ s tatCed aSsiipt ionIS or postnlaLtesIcledirie to COnlM.nIsiolls OIr ded-aionzti>ls thatt a1rCe Vet ir-ahle h\ systcratia cnipffic al researc horr stated III
othcr- ter !11ns to enconi awc in siocll inqnLir- the dC-cloptiient and application of thie kinl1d of dccpeundahle
riicthodoloen that has proved ot0ft IrttIl in thenatl - al sCiCences.
Eritr ies sliould lircscit a cormilpleted ialySsis otf a
pr-ohenim thec i-cles ant data, and inter liretation of thieda it rIIl c1 iiis of the p)ostIn fates s ith ss hicih t ie st LidhetC1a i.
tr'ipnhtlhshCd iiscrpf its 11i IarLtilicISCYi ts prilir-fisihd aticr Jairia s-N 973 are cli-tie T}1 icde-linie fo-r receipt of ctn es In the 1974 contest isI SCjitCiiIhie F or illstr-Lctiolis onI hoW to snhlriiit anIertitr s Triret to: Social-Psxchollogical Prize (Contest,FIigihthl Floor, 1776 M1ass-achusetts Avei. NAN, *W.ash-iiigton 1)D(., 20036.
-70CUltra-Cold.-.960CX -Ultra-oler.Both from Kelvinator Commer-cial. Upright drops to -76°C.Ultra-cold. Chest model dipsto -96°C. Ultra-colder. Up-right's six French doors openindividually. And you canlabel each door to know what'sinside. Easy labeling for what'sunder the chest's stainless steel ' -sliding lids, too. Want more?Automatic alarm systems? 2"portholes for recorders? TheKelvinator Commercial name?You got them. Don't be caughtin the cold without ultra-cold. \Contact J. E. Hirssig at Kelvinator\-Commercial, the company that knowshow to give you 12 cubic feet of the best cold you ever had:Upright UC-105 (-760C/-105'F) Chest UC-520 (-85°C/-120°F)Chest UC-540 (-96°C/-140°F)
NET-436 Polyuridylic Acid, ammonium salt[uridylate-5, 6-3H]Current Lot: 13 curies/mmole S105/25pcCi S325/100QkCiEthanol water solution (1 1 ): shipped in dry ice
:J- aO,par.e the qgr MA DNA- at eNI i' roI' LrRNA N erslri ep: ;' seLznce ar ftri (Xrcer of '50-2)00 nt,.i e0tl(ieJs>1 e(_lP[ICeShiKC lDrtEj fI Pt i C iC
pMo e(-oarntIybr cl asitr wt [:)(IyLrJyirtylJ.( has bee ujsed r -2 ietect t g ier eveis of
9{)>,e1 I,RNA~ eadIfng tn c;pecz Lti) t tpl, A trart!,- Z I.alc te( "In v(1 g o tl .pr tv c)f tl z'i) z,
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rt New England Nuclear575 Albany Street. Boston' Mass 0211 8Customer service 617-482-9595
You can* ohtain tIir-ee different flow rates at the sarne time through
ti 1tritte irldividually tensioned pumping channels* pic1jo tmIaes in seconds with the snap-in cassette* fc-c rttC pultsation thanks to the large driven rollers
* 'lKr ti corstant motor speedt electronically compensatedfo( (ir id temperature
* Pii t flow rate setweer 0 6 arnd 400 ml h per channel witht-ie IsAm'e qear box
* ',mvar; tilt- flow instantly* pusn f S 'a aximurni flow and clear puimp lines rapidly
f t oatEsa trve wIer-dtortvtar teI , C-,l
FAvInturCOoe PharmaciaNi,%ew Jersey 0885s4 Fine Chemicals