Mineral Area College

An interesting OHB of luminescence intensity was observed when we varied the excitation power density back and forth.

Presented is a comprehensive review of the applications of acoustic emission in the field of rock mechanics. Acoustic emission experiments in rock mechanics were initiated in North America in the late 1930s as part of a study by the U. S. Bureau of Mines into problems associated with mine design and alleviation of rock bursts. More recently acoustic emission techniques had been employed to an increasing degree for the laboratory study of basic deformation and failure mechanisms in geologic materials. This paper outlines the major rock mechanics areas where acoustic emission techniques are being applied, and includes a brief description of a number of basic and applied studies.

1. The methods commonly used to demonstrate Golgi bodies have been metallic impregnation with osmic acid or silver nitrate and vital staining, usually with neutral red. 2. Using these methods investigators have identified the following principal types of Golgi material in plant cells: osmiophilic platelets, the vacuome, small scattered globules, the cortex of the contractile vacuoles, and plastids. 3. Depending upon the methods used to demonstrate it, the Golgi material has been assumed to be a lipoid, a protein, or an acidic aqueous solution. Other evidence indicated that probably none of these was entirely correct. 4. Functions which were assigned by different investigators to structures which they identified as Golgi bodies in plants included:a) secretion of the limosphere of moss androcytes;b) secretion of enzymes involved in photosynthesis;c) contributions to the formation of sterigmata and basidiospores;d) osmo-regulation in flagellates; ande) storage of food. 5. The vacuome-Golgi hypothesis was withdrawn by Guilliermond in 1935. The osmiophilic platelet hypothesis is still upheld by a few investigators. The majority of recent studies of plant cytology have not included Golgi bodies as morphological entities.