Graduate research directory now ready After a three-month delay and in pa­perback rather than the expected hard­cover, the American Chemical Soci­ety's 1973 Directory of Graduate Re­search now is available. The directory lists colleges and universities in the U.S. and Canada known to offer an or­ganized curriculum leading to the doc­toral degree in chemistry, chemical en­gineering, biochemistry, and pharma­ceutical and medicinal chemistry. It includes information on the specific fields of interest and activity of faculty members in these areas at these schools.

The 880-page directory also includes the publications of these faculty mem­bers from May 1971 to April 1973. For faculty members listed for the first time, it lists all publications from 1968 to 1973.

A statistical section of the directory provides information on the number of doctoral degrees granted in 1971-72 and 1972-73, the number of graduate students enrolled, the number of post­doctoral engaged in research, and the number of full- and part-time faculty members employed as of September 1972. This section shows that at the 185 U.S. schools listed as offering Ph.D.'s in chemistry the number of de­grees granted declined from 1931 in 1972 to 1860 in 1973. These schools, as of September 1972, employed 4255 full-time and 259 part-time staff members, had 2460 postdoctoral appointments, and an enrollment of 13,028 graduate students.

The delay in releasing the directory resulted largely from a decision to pro­duce it by computer composition, which promised certain economies in production. However, the computer program was not fully functional and when copy had not been received in November for the scheduled December 1973 release, ACS had to distribute the composition among several firms using more traditional methods. This delay interfered with arrangements made for hardcover binding. Rather than hold up the directory's release by another three months a decision was made to produce the book as a paperback.

However, the attempt at computer composition of the directory was not a total fiasco. By the time composition was switched from computer to tradi­tional methods, much of the book was on tape. This information is being uti­lized to produce a concordance of re­search. The concordia will list in al­phabetical order specific areas of chemical research, keyed to faculty members interested in this area. It will be available for separate purchase.

The Directory of Graduate Research is available from the ACS Office of Special Issues Sales, 1155—16th St., N.W., Washington, D.C. 20036. Cost is $20.

DuPont instruments

JI i ^ JLJLLLI

X-Jl s

Detect neurotransmitters at picogram levels using a new GC/MS accessory.

Neuro-biochemists are discovering what happens in the nerve impulse process by analyzing ganglia of certain marine mollusks.

Using a new mass spectrometer accessory, the MSID (Multiple Specific Ion Detection), they achieve mass chromatograms with picogram

sensitivity from GC/MS samples. It is done by scanning just four compounds.

As illustrated, all four compounds are contained in one peak ( # 1) using a flame ioniza­tion detector. Monitored with the MSID, peaks ( # 2 ) and ( # 3 ) in­dicate alpha methyl amino acid and amino acid. Peaks ( # 4) and ( # 5 ) show alpha methyl amine and a primary amine. The GC trace has been increased in sen­sitivity and the merged peaks re­solved by specific ion monitoring.

The MSID accessary allows the use of the full gain of the MS electron multiplier as a specific GC detector—to give analyses with the highest sensitivity possible with a mass spectrometer.

For more information, circle 30 on Reader Service Card.

Perform preparative liquid chromatography with­out loss in column efficiency or separation time.

Now it is possible to scale up analytical separations to pre­parative levels in the same instrument without loss of chromatographic efficiency or analytical speed. With the Du Pont Model 830 Liquid Chromatograph, high sample throughput and fast separations can be achieved with the use of large diameter columns.

The Model 830 pumping system is capable of producing high flow rates (to 100 ml/min.) so that linear carrier velocity can be main­tained as column diameter is increased. Because the 830 pump is essentially free of any flow rate limitations, it is not necessary to sacrifice valuable analytical time when larger scale separations are required. In addition, the unique recirculating feature provides for optimum utilization of mobile phase.

Preparative liquid chromatography can now be done efficiently and quickly, and isolation of pure compounds for further characteriza­tions can be readily achieved. For more information circle 31 on the Reader Service Card.

Du Pont Instruments—a broad line of scientific, process and bio-medical instrumentation growing to meet the ever-increasing de­mand for measurement technology. Du Pont Company, Wilmington, Delaware 19898.

<^U1UNJ> Instruments »«6.U.»W»TO"

April 22, 1974 C&EN 37