Athens, Greece. (Intern. OrganizationsStaff, Bureau of Intern. Commerce, U.S.Dept. of Commerce, Washington, D.C.)

28-30. Hypnosis and PsychosomaticMedicine, intern. congr., Paris, France.(H. C. Harding, 2050 NW Lovejoy, Port-land 9, Ore.)

28-30. National Soc. for Preventionof Blindness, Houston, Tex. (J. W. Ferree,16 E. 40 St., New York 10016)28-1. Biometric Soc., Florida State Univ.,

Tallahassee. (E. L. LeClerg, 6804 40thAve., University Park, Hyattsville, Md.

28-1. American College Health Assoc.,Miami Beach, Fla. (R. E. Boynton, 5518Merrick Dr., Coral Gables, Fla.)

29-30. Space Navigation and Commu-nications, natl., Houston, Tex. (P. Schrock,Inst. of Navigation, 711 14th St. NW,Washington, D.C. 20005)

29-30. Association for Symbolic Logic,Chicago, Ill. (T. Hailperin, Dept. ofMathematics, Lehigh Univ., Bethlehem,Pa. 18015)

29-1. American Assoc. of Endodon-tists, Detroit, Mich. (E. C. Van Valey,9 Rockefeller Plaza, New York 10020)

29-1. American Assoc. for History ofMedicine, Philadelphia, Pa. (J. B. Blake,Natl. Library of Medicine, 9600 Wiscon-sin Ave., Bethesda, Md.)

29-1. American Acad. of Neurology,annual, Cleveland, Ohio. (AAN, 7100France Ave. S., Minneapolis, Minn. 55410)

29-1. Midwestern Psychological Assoc.,27th annual, Chicago, Ill. (F. A. Mote,Psychology Bldg., Madison, Wis. 53706)

29-1. American Philosophical Assoc.,western div., Chicago, Ill. (L. E. Hahn,Dept. of Philosophy, Southern IllinoisUniv., Carbondale)

29-2. Protides of the Biological Fluids,13th colloquium, Bruges, Belgium. (P.O.B.71, Bruges 1)

29-2. Association of Clinical Scientists,New York, N.Y. (R. P. MacFate, ACS,300 N. State St., Chicago, Ill. 60610)29-2. Pan American Medical Assoc.,

40th annual congr., Grand Bahama Island.(PAMA, 745 Fifth Ave., New York10022)

29-2. Roentgen, 46th German congr.,Nuremberg, Germany (A. Jakob, c/oStrahleninstitut der Staidt, Krankenan-stalten, Flurstr. 17, 85 Nuremberg)

30-1. Colorado-Wyoming Acad. of Sci-ence, annual, Univ. of Denver, Denver,Colo. (C. Norton, Dept. of Botany andPlant Pathology, Colorado State Univ.,Fort Collins)

30-1. Indiana Acad. of Science, Culver.(C. F. Dineen, St. Mary's College, NotreDame, Ind. 46556)

30-1. Nebraska Acad. of Sciences, Lin-coln. (C. B. Schultz, Morrill Hall 101,Univ. of Nebraska, 14th and U St.,Lincoln 68508)

30-2. Society of Biological Psychiatry,New York, N.Y. (G. N. Thompson, 2010Wilshire Blvd., Los Angeles, Calif.)

30-2. Academy of Psychoanalysis, an-nual, New York, N.Y. (A. H. Rifkin, 125E. 65 St., New York 10021 )

30-2. American Psychosomatic Soc.,annual, Philadelphia, Pa. (APS, 265 Nas-sau Rd., Roosevelt, N.Y. 11575)

30-3. American Psychoanalytic Assoc.,52nd annual, New York, N.Y. (APA,1 E. 57 St., New York 10022)2 APRIL 1965

The Finest

Spectrophotometers

are at Matheson SciX

210 235

-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ll l l l~~111 1111~~~~~i

111 11111H11.-

Coleman * Bausch & LombCarl Zeiss (West Germany)

Matheson carries the top lines at--

CHICAGO, 1735 N. Ashland Ave.CINCINNATI, 6265 Wiehe RoadCLEVELAND, 4540 Willow Pkwy.DETROIT, 9240 Hubbell Ave.HOUSTON, 6622 Supply RowKANSAS CITY, MO., 3160 Terrace StreetLOS ANGELES, 5922 Triumph StreetOAKLAND, 5321 East 8th StreetPHILADELPHIA, Jackson & Swanson Sts.

MAIL COUPON FOR SPECTROPHOTOMETER DATA

Matheson Scientific, Inc., P.O. Box 85, East Rutherford, N. J. 07073I Please send literature on the following spectrophotometers: I

EII Coleman O Bausch & Lomb El Zeiss I

NAME I

IFIRMI

ADDRESS II I

| CITY STATE

E1| WEATNHESHN UGIENTIFIC IDivision of The Matheson Company, Inc.

121

260 285

Call collect and ask for Maryann

That is, if you need C14, H3 or S35 labeled amino acids-orinformation about them - call her. She'll fill your orderfor any (or all) of the essential amino acids with C14 labelingthe minute you hang up. She has most of the essentialamino acids H3 labeled too. Some with S35. (It's truethat she'll also happily fill your order for a wide variety oflabeled and unlabeled nucleotides, antimetabolites, sugarsand other things. But that's not what this ad is about.Our catalog is complete though. Why not ask for it?)

122

Back to the labeled amino acids. Ours are generally lowestin price. Perhaps more important, however, are our qualityand activity specifications. They're the highest. And, witheach shipment we try to prove this by sending a ProductAnalysis Report covering the specific material you re-ceive. Gives you all the quality control data. Also aradiochromatogram with 0.5% sensitivity. This preciseevidence of quality enables you to use all your timedoing research. You can leave the quality control to us.

Schwarz BioResearch, Inc. cIOrangeburg, New York 10962

SCIENCE, VOL. 148

New Products

Refrigerated cabinet, Frigid-Cab 13,explosion-proof inside and out, ap-proved by Underwriters' Laboratoriesfor refrigerated storage of flammablematerials in potentially explosive at-mospheres; storage capacity, 13 ft3.Protects from explosion hazards dueto: fumes from containers in thechamber and leaking therefrom; fumesin the environment. Temperatureranges: from 350 to 50°F in the mainstorage area; from 00 to 20°F in thefreezer compartment. No internal con-trols; all wiring and controls arehoused in approved conduit or alumi-num castings. Compressor is hermeti-cally sealed and explosion proof. Stor-age chamber, 25 by 21 by 33 incheshigh (63 by 53 by 83 cm); freezer,22 by 13.5 by 8 inches high. Fourshelves. External dimensions: 30 by 32by 59 inches high.-D.J.P. (Lab-LineInstruments, Inc., 15th and Blooming-dale Aves., Melrose Park, Ill.)

Circle 1 on Readers' Service card

Expanded-scale pH meter, coversthe range 0 to 14 pH or 0 to + 1400mv; full-scale deflection of any 3-pHunit range or of 0 to ±+300 mv ob-tained by pulling the control knob. Nobatteries; calibration potential is pro-vided by a Zener-diode referencedpower supply. Input signal is modu-lated by a solid-state chopping system;use of a-c circuitry reduces drift toless than 0.005 pH per day. Repeat-ability better than +0.005 pH, withrelative accuracy of 0.01 pH when op-erating in the expanded mode. Ten-inch taut-band suspension meter has a

mirror scale to eliminate parallax.Temperature compensation, manual or

The material in this section is prepared byDenis J. Prager (D.J.P.), Laboratory of Tech-nical Development, National Heart Institute,Bethesda 14, Md. (medical electronics and bio-medical laboratory equipment).The information reported here is obtained

from manufacturers and from other sourcesconsidered to be reliable. Neither Scienice northe writer assumes responsibility for the accu-racy of the information. A Readers' Service cardfor use in mailing inquiries concerning the itemslisted is included on page 109. Circle thedepartment number of the item in which you areinterested on this card.

2 APRIL 1965

automatic, from 00 to I 00°C. Usablewith grounded or ungrounded solutionsand all standard electrodes. Suppliedwith the Corning pH electrode, withtriple-purpose glass membrane forgeneral purpose, low sodium-error, orhigh-temperature pH measurements.Dimensions: 15 inches square by 7inches deep.-D.J.P. (Corning GlassWorks, Corning, N.Y.)

Circle 2 on Readers' Service card

Well scintillation counter, detectssolid or liquid low-level gamma- or

beta-ray emitting samples in test tubesor bottles of small diameters. Crystaldetector is a 1.75-inch diameter by 2-inch (4.5 by 5.1 cm) sodium iodidecrystal integrally assembled with a 2-inch photomultiplier tube. This assem-

bly forms an optically coupled plug-in unit-light-tight and shielded frommagnetic fields. The well in the Nalcrystal is 0.66 inch in diameter by1.55 inches deep; holds 5-mi samples.Crystals up to 3 inches in diametermay be counted with this or a replace-ment detector. Lead shielding is 2.25inches thick, except at the bottom.Efficiency for iodine-131 is 45 percent;background level, 250 count/min. Ac-cess to the sample is by way of a swivellid (no lifting). Transistorized pre-amplifier has a gain of 10; providesoutput pulses of up to 5 volts negative.Output inipedance, 100 ohms; rise time,0.3 Msec; decay time, 1.6 Msec. De-signed for use with standard Baird-Atomic scalers, amplifiers, and ratemeters which supply the required highand low voltages. Dimensions: (modelWC-173) 8-inch diameter by 13 inches.Weight: 250 lb (1 12 kg). List: $995.-D.J.P. (Atomic Accessories Inc.,81 1 West Merrick Road, Valley Stream,N.Y.)

Circle 3 on Readers' Service card

Atmospheric particle sampler, versa-tile, compact, economical, collects par-ticles 1,1 / from large volumes of air(I 115 lit./min) on miniature-batterypower. The portable Rotorod has two

components: constant-speed motor ina case measuring 1.5 by 1.5 by 3.5inches high (3.8 by 3.8 by 8.9 cm);and a rotating collector rod. Particlesare collected by impaction on the lead-ing edge of the rotating rod. Volumeof air sampled is that swept out bythe collection surface; sampling rateis constant if motor speed is constant.Number, character, and size of parti-cles collected are determined micro-scopically, and volume of air sampledand particles per unit volume are cal-culated. Motor speed is constant at2400 rev/min -4- 2 percent at from 9to 16 volts. Battery life for continuousoperation: 4 hours on two 6-voltradio batteries; 50 hours on 12-voltlantern battery; 700 hours on 1 2-voltautomobile battery. Rods available intwo configurations: type H for parti-cles of I to 10 , (sampling rate, 41lit./min); type U for particles 10 ,u( 115 lit./ min). Collecting surface iscoated with tacky silicone grease orother suitable material. Samples maybe collected on either side of the rodby reversing battery polarity (and rodrotation). Model 60A (170 g) can betripod-mounted or suspended from aballoon; several can be arranged forsequential measurements. For labora-tories or industries concerned withmeasuring indoor-air pollution, table-

123

book A

news ThCHE

from

W&W

Levander:

INDUCTIONPHENOMENA IN

TISSUE REGENERATION

This careful study of the phys-iology, histology and histo-chemistry of tissue regenera-

tion contains both clinical andexperimental work. In it theauthor concentrates on theprincipal idea that regenera-

tion of tissue is a repetition ofits embryonic development,and, therefore, a mechanismcommon to both fetal andpost-fetal growth must besought. Much of the book isbased on hitherto unpublishedresearch, performed at the Ex-perimental Department ofKoping Hospital by Dr. Le-vander and colleagues.

By Gustav Levander, Depart-ment of Anatomy, Universityof Uppsala, Uppsala, Sweden

1965

211 pp., 67 figs.$12.00

THE WILLIAMS & WILKINS CO.

428 East Preston Street

Baltimore, Maryland 21202

Publishers of Books and Periodicalsin Medicine and the Allied Sciences.

mount model 60A-P has: both batteriesand a jack for external power, revers-ing switch, and jack for timer. Model60A costs less than $100.-D.J.P.(Metronics Associates, Inc., 3201 PorterDrive, Stanford Industrial Park, PaloAlto, Calif.)

Circle 4 on Readers' Service card

Sample chromatograms of physiolog-ical fluid analyses made in 11 hourswith Beckman Instruments model 120Bamino acid analyzer are featured in anew brochure, DS-248. The acceleratedrun-times result from the use of spher-ical resins as the column packing.All peaks are labeled, and acceleratedrun times are indicated. Samples repre-sented are human urine, human plasma,and a synthetic mixture of amino acidsand related compounds normally foundin physiological fluids (the concentra-tion of each component of this mixtureis indicated). Column size and height,flow rates, back pressure, sample size,buffers and times, and column tempera-tures and times are given. The brochureis a convenient reference, and a con-vincing advertisement for the Beckmananalyzer. Dimensions: 21.75 by 16.75inches (55 by 42 cm). Copies of thebrochure are available from Beckman.-D.J.P. (Spinco Div., Beckman Instru-ments, Inc., Palo Alto, Calif.)

Circle 5 on Readers' Service card

Thermoelectric microwave powermeter, measures from 0.3 ,w to 100mw full scale within 1 percent. Powerheads employ a well-matched loadwhich- absorbs the incident radio-fre-quency power; the load is made upof bismuth and antimony films vacuum-deposited on a Mylar substrate in aconfiguration that produces a numberof thermoelectric junctions. Some junc-tions- are thermally "sinked" to thetransmission line; others are located inthe air space within the line. Theabsorbed power increases the tempera-ture of these junctions relative to the"sinked" junctions, and a thermoelec-tric emf, linearly proportional to thepower, is generated. This voltage is fedto a chopper-stabilized d-c voltmeter(calibrated to read in power) whosenoise and drift are specified at lessthan 1 percent peak-to-peak of fullscale on the lowest ranges and corre-spondingly less on higher ranges. Dy-namic operating range of the voltmeteris 65 db, permitting measurements ofrf power from 0.3 uw full scale to100 mw full scale in 12 ranges. Accu-racy is ± 1 percent of full scale; am-

124

bient-temperature sensitivity is less than0.1 percent of reading per degrees centi-grade. Three coaxial power heads, eachwith a dynamic range of 45 db andeach covering the frequency range from10 Mcy/sec to 12.4 Gcy/sec, are avail-able. Two such heads, models N421 andN422, cover the rated power range,with a 25 db (5 scale) overlap; thethird head, model N420, covers anintermediate range from 3 uw full scaleto 10 mw full scale. Waveguide powerheads, covering the frequency rangefrom 8.2 to 40.0 Gcy/sec and ratedfrom 3 Mw to 10 mw, are also available.The voltmeter zero-set position carriesover from range-to-range. The powerheads require no bias current, so thatafter zero-setting the operator simplyconnects to the source under test andreads rf power. Several heads can beused with a single meter for multi-point monitoring. Junction box formanual switching between five differentpower heads is an accessory. List: volt-meter model 454A, $475; power heads,$250 to $400.-D.J.P. (General Micro-wave Corp., 155 Marine St., Farming-dale, N.Y. 11735)

Circle 6 on Readers' Service card

Laboratory laser kit, an easily assem-bled ruby laser head and power supply,makes available to research and schoollaboratories a medium-power laser atreasonable cost. Laser head, model300, furnishes a coherent laser beamof 6943 A at room temperature, witheither high- or low-voltage supply.Provided are: adapter for mounting ontripod or optical bench; feet for table-top operation. Lasing duration, 1 msec,with 12-milliradian dispersion (typical).Rate of firing, 1 pulse per 2 minutes.Typical output power density, 30,000watt/cm2, with energy output of 35millijoules. Dimensions: 3.5 by 4 by7.5 inches deep (9.6 by 10 by 19 cm).Weight: 3 lb (1.37 kg). List: kit,$310; assembled and tested, $330; rubyrod (0.150 by 1.50 inches), dielectriccoated, $120. Model 310 is a low-voltage supply designed specifically forthe model-300 head; output power, 450volts (324 joules). Provided withcharge-discharge switch and fire switch.Output voltage is continuously moni-tored by panel meter. Flash-tube triggervoltage of 15,000 volts. Dimensions: 8by 9.5 by 12 inches deep. Weight: 21lb. List: kit, $185; assembled andtested, $215.-D.J.P. (Interphase Cor-poration-West, 1060 E. MeadowCircle, Palo Alto, Calif. 94303)

Circle 7 on Readerse Service cardSCIENCE, VOL. 148

-~ ~ ~ ~ ~~~~~~~~"

0

Technical

CoordinatorFDA RELATIONS

This is an opportunity for the right man whohas a Ph.D. in biochemistry, physiology or phar-macology and who no longer feels his best futurelies in the laboratory, to join an important grow-ing department of an expanding major pharma-ceutical manufacturer located in New Jersey.

The man we seek must be interested in learn-ing administrative work required in the process-ing of New Drug Applications including review,interpretation and organization of chemical, pre-clinical and clinical data.

Salary open. Excellent fringe benefit program.

Send resume, including present salary in com-plete confidence to Box SM 1816, 125 W. 41 St.,

New York 36, N.Y.An equal opportunity employer

U N

MOSSBAUER EFFECT SOURCESNEW LOWER PRICES

COBALT-57Custom lmc source $195Demonstration source (1 mc)

$115TIN-1 19m

Custom mc source $240

NO HANDLING CHARGE

POSITIONS OPEN

A distillery plant has a vacancy for a sciencegraduate or other study-trained individual pos-sessing knowledge of general microbiology, pref-erably with some experience of biochemistryand industrial fermentation processes.

Salary according to experience and ability.Usual company benefits. Pleasant living environ-ment. Apply to the Managing Director, P.O. Box#727, Halifax, Nova Scotia. 4/2, 9

ELECTRON MICROSCOPISTVacancy for individual qualified in electron

microscopy of biological materials. Position wouldrequire some teaching. Salary dependent uponqualifications. Write: Dr. Richard H. McBee,Head, Department of Botany and Bacteriology,Montana State College, Bozeman, Montana.

HUMAN CYTOGENETICSOPPORTUNITY FOR POSTDOCTORAL RESEARCHEXPERIENCE IN EXPANDING NEW FIELD. PH.D.OR SC.D. STIPEND COMMENSURATE WITH BACK-GROUND. EXCELLENT SKIING, TROUT FISHING.LARGE UNIVERSITY MEDICAL CENTER, UPSTATENEW YORK. POSITION CURRENTLY AVAILABLE.

BOX 125, SCIENCE

UNIVERSITY OF ALBERTAApplication is invited for the position of As-

sistant Professor of Botany. Preference will begiven to applicants who hold the Ph.D. degree,have a well-established research program andsome teaching experience.The applicants' principal interest should be

plant morphogenesis and closely related subjects.The incumbent will be expected to teach one or

more courses in the field named and to partici-pate in the introductory courses in some capacity.For this position, appointment to date from

September 1, 1965, the salary offered is $8200 perannum or higher depending upon qualifications.

Applications should be submitted to Dr. H. J.Brodie, Department of Botany, University of Al-berta, Edmonton, Canada, not later than May 1,1965. Each applicant should provide a curriculumvitae, a transcript of record, a recent photographand letters of recommendation sent directly toDr. Brodie.

Department of BotanyUniversity of Alberta

Edmonton, Alberta, Canada

2 APRIL 1965

ER1SONNEL PLACEMENT

IIIIIIIIIIIIIIIIIII P SIO NSOPEN

-~~~~~~~~~~~~~~~~

ELECTRON MICROSCOPISTDoctoral level. Established department, fullyequipped. Interest and experience in humanand/or veterinary pathology. Open salary.University appointment. Fringe benefits. Op-portunity for self-expression and originalinvestigation. Write Box 104, SCIENCE.

4/2, 9

CLINICALPHARMACOLOGIST

World-leading midwestern pharmaceuticalhouse has an immediate opening on itsClinical Investigation staff for an M.D.with an advanced degree in a basic sci-ence. Clinical training in pharmacologicalinvestigative methodology or Board eligi-bility desired. Board certification not re-quired.Reply with complete resume including sal-ary requirements to Box 126, SCIENCE.

an equal opportunity employer

VETERINARYPATHOLOGISTWe have a new opening for a DVMwith a M.S. or Ph.D. in pathology and0-3 years experience to direct and con-duct toxicological and pathological re-search. He will be responsible for thedesign of an experimental program forthe evaluation of the safety of newdrugs, direction of toxicology sectionand the examination and evaluation ofpathological specimens. ACVP certifi-cation is desirable but not essential.ORTHO is a pharmaceutical and diag-nostic reagent firm. We lead the indus-try in our fields of interest and are in-volved in a period of exceptionallyrapid growth. Our research facility islocated in an attractive suburban com-munity 1½2 hours from New York City& Philadelphia. Publication of work &attendance at scientific meetings are en-couraged. Group insurance, retirement& stock investment plan are provided.Relocation expenses paid.

SEND RESUME TOMr. L. F. SIMPKINS

ORTHOPharmaceutical Corp.

ROUTE 202 RARITAN, NJ.(An Equal Opportunity Employer)

-I

SIIIHIlEIllIIII _ _ ____ __ _ __ _ 111|-- 11||1111

willilillillillimilimill - - -

I

125

I POSMONS OPEN

BIOCHEMISTOpening for a recent Ph.D., with or with-out postdoctoral experience. ExpandingR&D division.with new, ultra-modern fa-cilities. Work independently on drug me-tabolism studies. Publication encouraged.Our employees know of this ad. Submitresum6 in confidence to:

Director of ResearchEndo Laboratories, Inc.1000 Stewart AvenueGarden City, N.Y. 11533An equal opportunity employer

(a) Editor; medical abstractor; new house organ;Central; $12,000 up. (b) Hospital Market Man-ager; hospital administration or marketing ex-perience. (c) M.S./Ph.D. Microbiologist; tissueculture experience; Midwest drug firm. (d)Bacteriology Technician; Central company.Faculty Appointments: (e) Ph.D. Cytologist; de-velop graduate research; Southwest. (f) Mathe-matian; IBM 1620, Fortran experience; Central.(g) Ph.Di. Pharmacologist; Midwest professionalcollege. (h) Ph.D. Radiation Biology, geneticstraining; Southwest. Please write Science Service,The Medical Bureau, Inc., 900 North MichigaAvenue, Chicago, Illinois 60611. X

VETERINARY PATHOLOGISTHazleton Laboratories, a leading independentcompany specializing in the life sciences, needsa veterinary pathologist (D.V.M.-M.S. or Ph.D.)experienced or inexperienced. Position involvesexamination and evaluation of histology slidesfrom a variety of research animals; supervisionof gross autopsies; and research coordinationincluding experiment design and evaluation. Posi-tion also offers applicable experience towardBoard certification. Opportunity for scientificmeetings attendance and publications. Liberalemployee benefit program including profit shar-ing. Salary commensurate with experience andeducation. Please send resume to:

Hal A. AcufiAssistant Personnel ManagerHazleton Laboratories, Inc.P.O. Box 30Falls Church, Virginia(Suburban Washington, D.C.)

An Equal Opportunity Employer

BIO-ORGANICCHEMIST

Pfizer Diagnostics, an expanding new de-partment of Chas. Pfizer & Co., Inc., offersan excellent opportunity in research for aPh.D. in Organic or Biochemistry.Research assignments will be directed to-ward the development of new diagnosticreagent products and immunochemical tech-niques. Laboratories are located in NewYork City.To apply send r6sume including education,experience and present salary to:

MR. J. F. ANDERSON

Chas. Pfizer & Co., Inc.235 East 42nd St., New York, N.Y. 10017

An Equal Opportunity Employer

HEMATOLOGISTImmunohematologist or clinical immunologist.Doctoral level. Training and experience in im-munologic methodology. Open salary. Universityappointment. Fringe benefits. Opportunity fororiginal investigations. Write Robert C. Grauer,M.D., Director, Singer Research Institute, Alle-gheny General Hospital, Pittsburgh, Pennsylvania15212. 4/2, 9

PHYSICAL CHEMISTResearch on development of instru-ments for automatic continuous flowchemical analysis. New laboratoryfacilities. Excellent location. Rapidgrowth company. Opportunity to dovaried and interesting work. Respon-sibility for complete developments.Unusually good salary and companybenefits. Ph.D. preferred. For furtherinformation, send resum6 in confidenceto:

Box 124, SCIENCE

RADIOCHEMISTS WANTED for semi-micro organic synthesis of research andclinical isotopic products. Interviewingin Chicago, Los Angeles and FASEB.Contact in confidence, M. E. Volk, Ph.D.,8260 Elmwood Avenue, Skokie, Illinois

STEROID CHEMISTDoctoral level. Formauly trained in steroidchemistry. Position available in research instituteDepartment of Research in Endocrinology andMetabolism. Open salary. University appointment.Fringe benefits. Opportunity for original investi-gation. Write Robert C. Grauer, M.D., Director,Singer Research Institute, Allegheny GeneralHospital, Pittsburgh, Pennsylvania 15212. 4/2, 9

126

MENTAL HEALTH STATISTICIANTo direct statistical section in Ilinois Depart-ment of Mental Health. Requires M.S. In mathe-matical statistics or equivalent, 3 to 5 years'supervisory experience in biostatistics andepidemiology, and in use of IBM 1400 computersystems. Will also include consultation in ex-perimental design, cohort studies, and develop-ment of psychiatric registry. Inquiries to A.Herzog, Division of Planning & Evaluation Ser-vices, Departmnt of Mental- Health, 160 N.LaSalle Street, Chicago, Il1nols 60601. x

||||li*flll||*| COURSES MMIII IiSummer Programs in the BioSciencesUniversity of California, Berkeley

BIO-MEDICAL TELEMETRYMay 28-30

Miniature radio transmitters that can be swallowedor implanted in man or animals are being used toextend our knowledge in an ever-increasing num-ber of fields. This three-day intensive program willprovide systematic instruction, outline salient re-search problems, and indicate probable future de-velopments. Topics include electronic concepts, sen-sors and trctnsducers of physiological variables,active and passive transmitters, terrestrial andaquatic animal studies, medical applications.Tuition: professional, $125; graduate students, $60.

BIOLOGICAL ELECTRON MICROSCOPYJune 28-July 9

Rapid advances in electron microscopic applicationsto biological materials and the development ofnew techniques make electron microscopy an in-creasingly important field of modern science. Thiscourse will include a comprehensive series of lec-tures, demonstrations, and individual and small-group instruction by a faculty of 24 eminent sci-entists. Tuition: $300.

BIOLOGICAL ELECTRON MICROSCOPYLABORATORY July 12-23

Provides participants with a unique opportunity todevelop skill in electron microscopy while workingon a research project of their own design in anelectron microscope laboratory. Participants willwork directly under the supervision of a laboratorydirector and his assistant. Prerequisites: BIOLOGI-CAL ELECTRON MICROSCOPY (June 28-July 9).Tuition: $300.

For further information, please write or telephoneLetters and Science Extension, University of Cali-fornia, Berkeley, California 94720; 415-845-6000,ext. 1061, Mr. Patterson.

The Market Placel**|ll PROFESSIONAL SERVICES|INSTITUTE FOR COMPUTER ANALYSISOF SYSTEMS AND PROCESSES, INC.

188 NEEDHAM ST., NEWTON, MASS. 02164Telephone No.: AC 617 969-9190

Analog computer analysis of systems and proc-esses in biology, medicine, chemistry, engineering,economics, industry.Mathematical formulation, quantitative synthesisof functional systems, kinetic analysis.

SERVICES SUB-CONTRACTSLONG AND SHORT-TERM RESEARCH

CONTRACTS*eScientists are invited to send proposals for co-operative research in applied and basic sciencesfor application of contracts.

1111111 SUPPLIES AND EQUIPMENT IDE

SPRAGUE-DAWLEY, INC.Pioneers in the development of theSTANDARD LABORATORY RAT.

P.O. Box 4220Madison, Wisconsin

CE 3-5318

SCIENCE, VOL. 148

MICROBIOLOGISTHematologist

Ph.D. preferred. To do original re-search in immunological and hemato-logical techniques leading to the de-velopment of automated analyticalprocedures. Must be able to conductresearch independently. Excellent re-search environment. Excellent com-pany benefits. For further information,please send your r6sum6 in confidenceto BOX 123, SCIENCE.

Research Associate

Ph.D. or M.D. Full time researchin microbial or human biochem-ical genetics. Salary: $7,000-$9,-500, depending on qualifications.

Fellowships in MentalRetardation

Ph.D., or M.D. One or two yearFellowships offering training inlaboratory and/or clinical aspectsof detection, diagnosis and studyof mental retardation. Laboratoryemphasis is on biochemical ge-netics.

Robert Guthrie, Ph.D., M.D.Department of PediatricsState University of New York at

BuffaloChildren's Hospital219 Bryant StreetBuffalo 22, New York

=;e

-A

I W

I

All of These and Many Other Possible Applications with OneVersatile Research Tool having 4 Channel Recording Capability

ESE The Gilford Model 2000

This highly productive spectrophotometric systemhas the essential flexibility to keep pace withchanging directions in research. Based upon aunique photometric system with an output linearwith absorbance over a wide range, the Model 2000system offers exceptional sensitivity and stabilitytogether with low noise level and high accuracy.The inherent capability of the photometric ele-ment is greatly extended by automation of thesample handling device to provide precise posi-tioning of up to four sample cells with program-med timing. Additions of flow cells, a temperaturerecording channel, automatic baseline compensa-tion and wavelength programming facilities fur-ther enhance the usefulness of the Model 2000.Request brochure and quotation.

Conventional Absorbance Mea--.11 -""l"4 surements also easier, moreW Gaccurate. Digital readout: 0.00

.° 5 1Q 0 5MINUTES to 3.000 0. D. Sensitivity, darkcurrent controls and shutter

Reproduction of continuous linear recording eliminated. Line operated.e v rs, oz u- r-Ot assay OT Li--t-r uenyarogenese illustrates

one of the many types of enzyme kineticrecordings obtainable virtually automaticallywith the Model 2000 or Series 200 ModularGilford System.

Scanning for protein using the sucrose den-sity gradient method. A 10 mm pathlengthGilford Flow-Through Cuvette was employedwith the Gilford Spectrophotometric Record-ing System to produce the record shown.

INSTRUMENTLABORATORI ESINCOR PORATEDOBERLIN, OHIO

Factory Trained TechnicalConsultants Provide DirectRepresentation Throughout

The U.S.A.

[ 2.0 IL+7. -1-ii iq "~E

-. CELL 4-1Omm p. 1. -1.890. D.

TIME

Chromatogram of Dowex-1 column elutedwith Formic Acid shows section with AMPpeaks only. Record made with Gilford Model2000 equipped with Gilford Flow-ThroughCuvettes and Automatic Blank Compensator.Salmon Sperm DNA profile illustrates linearregistration of both temperature and absorb-ance changes on the same scale. GilfordModel 2000 equipped with Gilford LinearThermosensor which measures temperaturechanges in cuvette chamber.

GLUCOSE-6-PHOSPHATDEHYDROGENASE

0.5-

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More than 22,000 stock itemsNew edition lists more than 22,000 items, adequate supplies of whichare regularly maintained in our headquarters stock for immediateshipment.

Selection of ApparatusBased on careful review and evaluation by our Technological staff.Quality maintained by our Inspection staff. Includes many new linesand items.

GuaranteeWe accept full responsibility for quality and performance of every

- ~~~~~~~~~~~itemlisted.

Detailed, factual descriptionsAll items fully described, carefully indexed and cross-referenced.

Technological ServiceQualified experts available for consultation and service.

Prompt shipmentsWe offer unexcelled service because of our large stocks and stream-lined order handling system, combined with an international airport,excellent motor transport networks and a major seaport.

Copies sent to laboratories and purchasing personnel on request.

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