The seeds of the gramineous plant Coix lachryma-jobi L. var. ma-yuen Stapf are a traditional Chinese medicine possessing antitumor activity. An acetone extract of the seeds was fractionated by the aqueous alkali method and by silica gel column chromatography in order to identify the antitumor components. Antitumor activity, as assayed by an in vivo growth inhibition test on a transplantable mouse tumor, was attributed to an acidic fraction. Infrared spectroscopy and gas-liquid chromatography showed that this acidic fraction was composed of four free fatty acids: palmitic, stearic, oleic, and linoleic acids.
Microelectrochemical polarization and silver decoration techniques were performed on a small area with and without MnS inclusions in carbon steel. The surfaces of the inclusions were found to have partially dissolved in the potential range from 0.35 to À0.25 V (vs. SHE) in a boric-borate buffer (pH 8.45) solution with 10 mM NaCl, whereas the entire surface of the inclusions was slightly dissolved below and above this potential range. Silver deposition occurred only on and around MnS inclusions below 0.0 V, which generally corresponded to the stable region of hydrogen sulfide ions. When the inclusion surfaces were partially dissolved, silver deposition was observed only in the dissolved area. The dissolution species from MnS inclusions appeared to have promoted the hydrogen absorption reaction.
We developed a 1 MV field-emission transmission electron microscope. This paper reports details and specifications of the instrument. The microscope was designed to obtain a bright and coherent electron beam by using the field emission gun equipped with a pre-accelerating magnetic lens and the high-voltage power supply with high stability (0.5 ppm min(-1)). Using this microscope, the brightness of 1.8 x 10(10) A cm(-2) sr(-1) and the lattice resolution of 49.8 pm were attained.
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