lead to the same class of aminocarboranes, Dr. Knoth says. n B NMR analysis shows that the carborane skeleton is not affected by the deamination to B 1 0 H 1 2 C H - . It seems probable from B 1 1 NMR spectroscopy that BioH^OHOCNHa and its N-methylated derivatives are also members of this structural class, he adds. The B 1 0 H 1 0 C H - anion is obtained as a by-product in the B 1 0 H 1 2 CH~ preparation. This by-product and B 9 H n C N ( C H 3 ) 3 are members of other new carborane series. n B NMR analysis suggests a symmetrical structure for B 1 0 H 1 0 C H _ . This anion has the same number of electrons as B 9 C 2 H n , and quite likely the two species have similar structures, Dr. Knoth says. The structure of B 9 C 2 H n was proposed by Dr. T. E. Berry, Dr. F. N. Tebbe, and Dr. M. F. Hawthorne of the University of California, Riverside, and confirmed by Dr. Chun-che Tsai and Dr. William E. Streib at Indiana University. The n B NMR spectrum of B 9 H n C N ( C H 3 ) 3 suggests that it has a structure similar to that of decarborane, with carbon replacing boron at B-6. Dr. Knoth points out that B 9 H n C N ( C H 3 ) 3 has the same number of skeletal electrons as B 1 0 H 1 2 2 _ recently prepared by Dr. J. C. Carter at the University of Pittsburgh.
Five new ACS tests are available The examination committee of the American Chemical Society's Division of Chemical Education has five new tests available: • General Chemistry Form 1967—a 105-minute test covering atomic and nuclear structure, molecular structure and bonding, stoichiometry, states of matter, kinetics, thermodynamics, acid-base theory, equilibrium, electrochemistry, and descriptive chemistry. • Brief Qualitative Analysis Form 1967—a 50-minute test for onesemester qualitative analysis students. It may also be given as a supplement with any test in general chemistry. •Organic Chemistry Form 1 9 6 7 B an 80-minute test covering the subject matter of a brief course including such topics as nomenclature, functional group reactions, analytical deductions, and some theoretical concepts. • High School Chemistry Form 1967—an 80-minute test designed to test the students who have had some stress placed on the learning of skills, principles, and concepts in a first-year chemistry course. • Graduate Level Placement Ex-
Announcing the
amination in Physical Chemistry Form 1967-P. In addition, the examinations committee features 29 other tests in its spring testing program covering all fields of chemistry at the high school, college, and graduate levels. These examinations are confidential and are available only to members of educational institutions. For a descriptive brochure and further information write to the Examinations Committee—ACS, University of South Florida, Tampa, Fla. 33620.
NewffEA System for ELECTROPHORESIS
RESEARCH IN BRIEF
Japan's largest cyclotron has been constructed at Yamato in Saitama prefecture by the Rikagaku Kenkyusho (Physical and Chemical Research Institute). Based on the design of a smaller unit at Tokyo University, the new cyclotron can accelerate heavy ions such as those of carbon, nitrogen, and oxygen. It features a wide range of accelerating voltages and is specially shielded from sources of external radiation. The field strength of the unit is 20,000 gauss with maximum input being 400 kw. The frequency range is 5.5 to 13.5 megacycles. Maximum energy range for alpha particles is 14 to 48 m.e.v.; for He 3 + , 10.5 to 45 m.e.v.; and for N 4 + , 49 to 120 m.e.v. The catalytic decomposition of nitrogen oxides is being studied by a group of engineers at the University of Colorado. Dr. Max S. Peters and his coworkers say these studies on the electron transport processes may lead to the design of catalysts to remove nitrogen oxides from automobile exhausts. High doses of gamma rays from cobalt-60 can restore the oxygen-carrying capacity of blood previously destroyed by lower doses of the same radiation in blue-blooded animals. University of Pittsburgh scientists Jack Schubert and E. R. White say that the finding provides clues in the search for antiradiation drugs. According to Dr. Schubert, the blood of animals such as lobsters, snails, and scorpions turns deep blue when a blue protein (hemocyanin) in their blood picks up oxygen. This protein, which contains copper rather than iron, is dissolved in the blood fluid. When the copper atoms are disrupted by radiation, they are unable to combine with oxygen because the hydrogen peroxide released oxidizes copper. However, with higher doses of radiation, more hydrogen peroxide is released and the copper is reduced. At some point the disrupted copper atoms and the oxygen capacity of hemocyanin are restored to the preradiation state.
EA-4 Power Control Supply Designed especially for electrophoresis. Continuously variable voltage 0 to 500 V. Stable: Supplies constant voltage. (Ripple less than ± 0.1%. Unit regulates to ± 0.1%.) Also can supply constant current over entire range. No variance in mA with change in load ± 90%. Double scale meter shows V and mA. Exclusive built-in timer with automatic shut-off. Four chambers — simultaneous operation (7 tests per chamber). Constant current control over entire electrophoretic range.
EA-1 Electrophoresis Chamber High impact polystyrene; water cooling jacket. Domed see-through lid. Safety interlock. Platinum electrodes run entire chamber length. Polarity reversing switch. Simple, accurate method of attaching sample strip with flexible holders in integral part of chamber unit. This system offers features and advantages never before found in electrophoresis equipment. The design is superb—and the system was precision built by scientists expressly for scientists. Our free brochure will give you a full description complete with additional pictures.
\~MAIL COUPON TODAY! "j Car! Schleicher & Schuell Co. | Keene, New Hampshire-Dept. CEN-67-3 Please send free brochure on new
I | I
I S&S/EA System for Electrophoresis
J
Mamf>
|
i Company
J
' Address
I
| City
j
I
| State
Zip# MARCH 6, 1967 C&EN
I 47
