Fluorescence a n d phosphorescence analyses are extremely sensitive for identification a n d quantitative assay Minute quantities of phosphorescent substances can be detected and then quantitatively measured by Aminco's new Spectrophospborimeter. This basic instrument with a Fluorescence Attachment can be used also for fluorescence work with a high degree of accuracy. Useful for a host of applications from the detection of carcinogenicity in air samples, to the measurement of serotonin and noradrenaline in the human brain, instrument operates throughout the visible and ultraviolet range. Equipped with a new attachment, the range is extended well into the infrared region. See it demonstrated at the NIH show . . . send for companion Bulletins 2334 and 2336-H. Photo (left): Spectrophosphorimeter in use at NIH where it is used in connection with a broad program to determine the various medical applications of phosphorimetry.
Newest TITRATION instruments use MICRO quantities . . . perform w i t h exceptional accuracy:
BE OUR GUEST at the National Institutes of Health (NIH) Show w h e r e all these
NEW ANALYTICAL INSTRUMENTS WILL BE DEMONSTRATED Oct. 4 - 7 , 1960, National Institutes of Health, Bethesda, Md., Booth 75 (Other shows at which Aminco Instruments will be demonstrated
listed below.J
CHLORIDE TITRATOR - . · An extremely fast, simple-to-operate instrument that measures the chloride content of biological samples or inorganics with equal facility. At a U.S. Govt. Lab (shown at left), the instrument determines chlorides in sugar with such a high degree of speed and accuracy that it prompted the research team to use an ion exchanger so that anionic constituents (other than chlorides) could be exchanged for chlorides and thus be measured by the same instrument. Newly reported application for the Titrator is to measure the amount of pesticide and insecticide residues in meat. Full information in Bulletin 2337-H. M E N I S C O - M A T I C BURET (Aminco-Koegel, photo below) An automatic titrator that dispenses ultra-micro volumes in the range of 100 microliters with a precision and accuracy of at least six parts per thousand. This makes possible the use of concentrated titrants so that titrations can be performed with virtually no change in total solution volume. Amount of titrant delivered can be read directly from the digital readout assembly mounted on the side of the instrument. New literature package includes a descriptive bulletin plus a paper by J. M. Klaasse presented at a recent ISA Symposium showing how a permanent record of pH and titrant quantity can be maintained and I how the instrument can be used ' as a pH-Stat. Send for literature package 2286-H.
Menisco-matic Buret
Other shows in which Aminco instruments will be exhibited include: 1. American Chemical Society's Chemical Exposition, Sept. 13-15, Booths 121-122, Hotel Statler-Hilton, New York. 2. American Society of Clinical Pathologists, Sept. 2 5 - 3 0 , Palmer House, Chicago, III. 3. Eastern Analytical Symposium (American Chemical Society & Society for Applied Spectroscopy), Nov. 2-4, Hotel New Yorker, New York.
Above; 9-station Warburg used for classroom instruction at Duke University. Right: U.S.D.A. Soil Scientist uses micro-Kjeldahl digestion appa ratus to determine nitrogen. Lower Right : Aminco's Photronreflectoineter and recorder.
9-station WARBURG excellent for classrooms & labs short ΟΠ s p a c e . . . The 9-station W a r b u r g (illustrated above) is particu larly well suited for labs with limited bench space and for classrooms. It is the smallest, most compact micro-respiration instrument on the market yet features the same high degree of accuracy as Aminco's well-known 1 8-manometer Warburgs. The instrument accepts any stand a r d W a r b u r g , Summerson, Barcroft, or Aminco single-stem manometer, yet is only 4 0 inches high (over-all) and weighs only 63 pounds. It maintains bath temperatures from ambient to 5 0 ° C with a constancy of ± 0 . 0 2 ° C to ± 0 . 0 4 ° C . Shaking speed is adjustable from 0 to 150 oscillations per minute. Amplitude o f flask travel is adjustable from 0 to 4 0 mm in any desired increment. Full information on Aminco's entire W a r b u r g line in Bulletin 2 3 3 1 - H , f o r w a r d e d on request.
Semi-micro Kjeldahl Nitrogen Determinations save time a n d m o n e y . . . More and more reports from the nation's labs indi cate that the new semi-micro methods for nitrogen determinations are much more convenient than macro methods, equally as accurate, and f a r less expensive. In the photo above, the new equipment is in use in a U. S. D. A . research lab where soils are being analyzed. The method includes digestion of semi-micro quantities of sample together with s m a l l amounts of reagent (one big source of dollar savingsl). Digested samples contained in the dual-purpose flasks shown in photo are then clamped into place on a distillation head and con denser f o r the very short distillation phase. Titration can then be accomplished with the Menisco-matic Buret to determine the accurate nitrogen content of the sample. Full information in Literature Package 2271-H which also contains detailed procedures in reprints of several excellent papers . . . for w a r d e d upon request.
Freezing-point Depression Apparatus to be introduced at N I H S h o w . . . Aminco will display a compact new osmometer at the NIH Show f o r the determination of osmotic pressure; and molecular weights of many water-soluble and benzol-soluble organic compounds. The unit routinely achieves an accuracy of better than ± 2 % or 1 milliosmole per liter, whichever is greater over the range of 0-1.85 osmolal concentrations. Full information in Bulletin 2 3 3 8 - H f o r w a r d e d upon request.
A M E R I C A N I N S T R U M E N T CO., INC. 8 0 3 0 G e o r g i a A v e . , Silver S p r i n g , M d .
AMINCO Circle No. 151 an Readers' Service Card
Diffusion and density patterns of human-antihuman precipitin reac tions in agar columns used to detect certain serological imbalances . . . The Aminco Photronreflectometer (above) can be used as a diagnostic and prognostic tool in the treatment of diseases whose characteristics are evidenced by serological imbalances. Serum samples are carefully layered above a rabbit anti-serum-agar mixture in a glass ampule, and stored at controlled temperature for a prescribed period. There after, specimens are inserted into the cell holder of the Photronreflectometer where a beam of light is passed through the sample as it moves in a vertical path. Re spective density and diffusion values are scanned and recorded in about 15 seconds. LITERATURE A V A I L A B L E : Upon request, Aminco will f o r w a r d a literature package including a reprint of a paper entitled "Detection of Certain Serological Imbal ances in Human Sera by Agar Columns" from the J. O f Lab & Clin M e d ; Bulletin 2326-H describing the Photronreflecto meter; and a list of stock serum agar col umns available from Analytical Products Co.
