of Courtauld atom for each position of the ionized form. The L configuration about the alpha carbon is used ; instructions are given for the D configuration.
WHAT'S
NEW
Announcing Schulman Life Structures Sets of Courtauld Atomic Models. The Courtauld Atomic Models are uniquely suited for constructing various "life structures" including amino acids, peptide chains and alpha-helixes; and the nuclei structures, the purines and pyrimidines. Now in cooperation with Dr. Sidney Shulman, Associate Professor of Biophysics and Immunochemistry at the University of Buffalo, The Ealing Corporation presents a series of five new Courtauld Atom model sets uniquely suited to the teaching of these structures. The Medical and Dental school at the University of Buffalo has equipped their laboratory with 50 of these sets, providing one per group of four students. Dr. Shulman's detailed instruction manual accompanies the sets. It presents for each of the 25 naturally occurring amino acids the classical formula, the ionized form at pH 7, and the choice
The nucleic bases, nucleotides and related structures are also depicted in detail. The purines and pyrimidines are shown in both keto and enol forms. Instructions for hydrogen bonding of base pairs are given. A series of forty-five 2" X 2" color slides is being assembled showing all of the structures described in the manual. The slides are included in the larger sets as is an Angstrom caliper. The principal differences among the sets lie in the number of things which can be built simultaneously. The sets are put up in sturdy boxes with the atoms organized in compartmented trays. As an aid in teaching, each set also contains offprints of several relevant articles by noted authors which have appeared in the Scientific American in recent years. A detailed list of contents of the various sets and their capabilities is available. The color slides separately are S20.00: the Instruction Manual is $3.50. The sets range in price from $118. to $1250.
You can get the "feel" of Courtauld atoms with our $10 Basic Peptide Residue Set: 7 atoms, links, collars and spacers or our $5 Introductory Set : 4 assorted atoms, links, collars and spacers.
THE
Ealing
CORPORATION
Cambridge 40, Massachusetts
Circle No. 62 on Readers' Service Card
L
CA AB
MODEL C ROTARY EVAPORATOR All glass and Teflon surfaces: No metal, rubber or grease to react with sensitive materials.
High-vacuum, low-temperature Rotary Evaporator from CaLab features:
Greaseless vacuum seal: Teflon ball joint in stationary glass socket' joint forms seal that maintains 0.1 mm vacuum while flask and shaft rotate. Continuous addition: Easily adapted for either continuous addition rotary evaporation of flash evaporation. Heavy-duty motor: Fully enclosed Bodine induction motor powers unit with sparkless, quiet, cool-running operation. For full information on the Model C Rotary Evaporator, write for Brochure AE.
California Laboratory Equipment Company 1717 Fifth Street
• Circle No. 27 on Readers' Service Card
72 A
·
ANALYTICAL CHEMISTRY
Berkeley 10, California
