Molecular Presentation Graphics

Tel. 800-227-5558, 202-872-4363, fax 202-872-6067 A 3D visualization program, which is capable of rotating molecules with up to 32,000 atoms, for the Macintosh II. Molecular Presentation Graphics (MPG) for chemical structure drawing. ChemWhere for searching for MPG structures in word processing documents. Also, ACS is second party distributor for Alchemy, Chem3D Plus, and other software for PCs and Macintosh 11. 

Molecular Presentation Graphics, MPG, is marketed by Hawk Scientific Systems, Kinnelon, New Jersey, USA. 

Samples are introduced by a six-port injection valve, and analytical results are presented graphically as a chromatogram showing the UV absorbance of the eluate stream versus run time, each molecular constituent being represented by a chromatographic peak (Fig. 9). The required sample size is 0.1-0.5 ml, and the total separation time is 40 hours for the larger system and 24 hours for the miniaturized system. Sensitivity is a few nanograms for many constituents (Fig. 10). 

Surface activity at the air-water interface of solutions of the oligomer salt is inferred from measurements of surface tension lowering. Typical data obtained from two refined molecular weight fractions are presented graphically in Figure 1. Surface tension is estimated by the pendant drop method with the aid of tables supplied by Adamson (4). 

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