NEW CHEMICALS High Purity Sodium M e t a l in Tubular Capsules Safe, easy to use, high p u r i t y (99.9%) sodium is available i n 1 gram ( ± 5 % ) net weight Pyrex ampoules 9 inches long by 3-mm diameter and sealed w i t h a special inert wax. Sodium may be used in measured amounts simply b y break ing off the desired length at 0.1 g r a m / 2.3 cm. The metal, glass tube and all, can be used directly, without crushing, so that the small end area slows the ex ceptionally high reaction rate of so dium, or the tube may be crushed for greater area. Unified Science Asso ciates, Inc. 826 South Arroyo Park way, Pasadena, Calif. 91105. 505 Silylating Agent
DONT "MESS AROUND"
with mediocre FUME HOODS
DEST. Ih STOCK Yes! It's true. Kewaunee fume hoods are immediately available in 4'-0", 5'-0" and 6'-0" sizes in the Conventional and Airflow Supreme models and even Auxiliary-Air type fume hoods can be delivered in "short order." Service and quality are important reasons why Kewaunee has, for 60 years, been the leader in the scientific laboratory equipment field. TRY SOME, YOU'LL BE SOLD, TOO! *AII stock fume hoods are NOW available in Kewaunee #40 light gray.
®
KEWAUNEE MFG. CO., ADRIAN, MICH.
5090 S. CENTER ST. Circle No. 126 on Readers' Service Card
Alditol A c e t a t e Reference Standards Four varieties of alditol acetate refer ence standard kits for fast quantitative and qualitative gas-liquid chromatogra phy analysis of carbohydrates are now available for use in analytical proce dures consisting of a two-step conver sion of monosaccharides to their respec tive alditol acetates. Regis Chemical Co., 1101 N . Franklin St., Chicago, 111. 60610. 507
when KEWAUNEE has the
KΕΜMΕΤΑL
A new potent silylating compound called Regisil or bis-(trimethylsilyl)-trifluoroacetamide, ( B S T F A ) , is an analog of BSA but displays certain advan tages : increased reactivity i n less time, increased volatility and solubility, and lower detector response. Regisil is sup plied i n 5-ml septum-stoppered vials i n two forms: Regisil Concentrate and Regisil plus 1% trimethylchlorosilane. Regis Chemical Co., 1101 N . Franklin St., Chicago, I I I . 60610. 506
Silylation Kits The Tri-Sil Poly Solvent K i t for rapid, one-step production of trimethylsilyl derivatives of polar compounds i n cludes Tri-Sil Concentrate reagent and four silylation grade solvents: p y r i dine, dimethylformamide, dimethylsulfoxide, and tetrahydrofuran. The Poly-Sil K i t offers a complete as sortment containing the necessary re agents and solvents for silylation proce dures. The materials are packaged i n H y p o Vials for easy access and protection of contents, and are contained i n a polyolefin case. Instructional pamphlets are enclosed i n each k i t . Pierce Chemical Co., P. O. Box 117, Rockford, 111. 61105. 508
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17
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1
enriched ' water and gas \
and
£
labeled ν compounds «V^
llllii»»»%%* from the primé source Now made conveniently available throughout the world by Miles' distribution. These isotopes are produced by "Yeda, converted into labeled compounds by Miles-Yeda, Ltd., both of Rehovoth, Israel, and distributed world-wide by Miles Laboratories, Inc., Elkhart, Ind. Now
Available
O x y g e n - 1 7 Gas, 7 0 atom "/· 19 other standard O ' 7 enrichments as water or gas. O x y g e n - 1 8 Gas, 9 9 atom % 21 other standard O 1 8 enrichments as water or gas. O x y g e n - 1 7 and O x y g e n - 1 8 Labeled Compounds 40 different compounds labeled with either isotope.
Complete stocks i n Elkhart, Indiana, U.S. Α.,and Rehovoth, Israel. Order from Miles distributors i n Great Britain, con tinental Europe, Africa, Japan, and Australia. Request complete 12-page Heavy Oxy gen Enriched Materials catalog includ ing over 10011general 18and selected refer ences to O and O applications and analysis.
MILES LABORATORIES, INC. RESEARCH PRODUCTS DEPT. Elkhart, Indiana 46514 U.S.A. Circle Nc. 56 on Readers' Service Card
VOL. 39, NO. 14, DECEMBER 1967
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