NEW
CHEMICALS REAGENTS MATERIALS
CHEMICALS tiated at either center without losing the reactive possibilities of the other center. In addition to the general use of meth allyl chloride as an organic intermedi ate, the company suggests application of methallyl chloride polymers for evalu ation in adhesives, protective coatings, molding powders, and specialty rubbers. 15
Methallyl Chloride The recently formed Organic Chemi cals Division of Food Machinery and Chemical Corp. is offering methallyl chloride for use in organic synthesis as well as in the resin and plastics field. The compound, 3-chloro-2-methyl1-propene, can be self-polymerized or copolymerized with a wide variety of reactive monomers, the company says. Furthermore, the methallyl monomers are said to exhibit increased reactivity as co-monomers in free radical poly merization, resulting from the electro negative nature of the carbon to carbon double bond in the methallyl structure. Two highly reactive centers in the methallyl chloride molecule provide the basis for numerous applications of the compound as an organic intermediate. The company claims this chloride will be a versatile building block in the hands of the organic chemist because of the ease with which reactions can be ini
Biphenyl Derivative Available in Research Quantities Isopropylbiphenyl can now be ob tained in limited amounts from Mon santo Chemical Co.'s Organic Chemicals Division. A product of the company's research on new fluids for heat exchange, the chemical is being considered as a re placement for wai/3r and/or liquid metals in nuclear reactors. It is a water white liquid ,and has a molecular weight of 196.3. Monsanto anticipates applications of the com pound as a heat evchanger, chemical
intermediate and dielectric now that re search quantities are available. 16 Spectrographs Standards Standards for semi-quantitative spec trographs analysis of liquids and solids are available from Spex Industries, Inc. Prepared for use in analysis of most ma terials encountered by the spectrochemist, the standards come in sets of three or four. Ores, minerals, pure chemicals, wet chemical precipitates, corrosion deposits, and organic ashes are among the many materials which may be analyzed. 17 Special Introductory Offer of Buffer Solution Kit Standard pH buffer solutions can now be simply and quickly mixed in the laboratory, according to Analytical Measurements, Inc. The company has recently announced its special intro ductory offer of a kit which includes three polyethylene squeeze bottles labeled p H 4, pH 7, and p H 9, and three sealed, vapor-proof envelopes of each value, making 500 ml. of solution per bottle. In order to prepare the pH buffer solution, one merely empties the con tents of an envelope into one of the large-mouthed bottles, and adds dis tilled water to the bottom of the neck. Screw the dispenser top to the neck of the bottle, shake thoroughly, and a fresh bottle of buffer is ready. 18 Biochemical Reagent
©α* Fired Continue us Rotary Dryer Steam Heated Continuous Rotary Dryer Gas Fired Rotary Continuous Combination Calciner and Cooler Electrically Heated Rotary Continuous Combination Calciner and Cooler Direct Fired Rotary Kiln Steam Jacketed Batch Dryer (with Rotary Sw*ep)
RESEARCH AND PILOT PLANT EQUIPMENT for D R Y I N G and C A I L C I N I N G The gas fired rotary continuous combination calciner and cooler — pictured above — is used for heating and subsequent cooling of metal oxides, ores, carbonaceous and other materials in an oxidizing, inert or reducing atmosphere. Material can be heated to about 2000° F. and cooled to between 150-200° F. Tired with natural, manu factured or propane gas. Approximately 3 ' 6 " wide; 9'6" long; 4 Ό " high (including the drive). For either purchase or rental.
Get full details. Write for Bulletin No. 117 today! THE
C. O. BARTLETT
0210
HARVARD
AVENUE
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CLEVELAND
5.
CO.
A high purity reagent, o-nitrophenyl/5-D-galactoside, is available from Mann Research Laboratories for assay of the activity of galactosidase in protein syn thesis studies, adaptation in micro organisms, and enzyme kinetics. The reagent is said to form 99.5 ± 1% of o-nitrophenol on enzymatic hydrolysis, and this substance can be accurately de termined by means of a colorimeter or spectrophotometer. According to Mann, the new reagent permits a simple and dependable method for measurement of galactosidase activ ity which is more suitable than previous physical, chemical, and biochemical methods that have not been entirely satisfactory. 19
OHIO ^
For further information, circle number 88 A on Readers' Service Card, page 77 A 88 A
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ANALYTICAL CHEMISTRY
For further information; see coupon on page 77 A
