In each male, the following testicular lesions were scored: (1) hemocytic infiltration of the gonadal acini and phagocytosis of spermatogenic cells, (2) hemocytic infiltration of interacinal connective tissue, (3) aggregations of hemocytes under the mantle epithelium, and (4) occurrence of brown cells.
For example: a long exposure refers to a single, protracted shutter cycle to capture enough low-intensity light, whereas a multiple exposure involves a series of relatively brief shutter cycles; effectively layering a series of photographs in one image.
Share. By Anne Marie Helmenstine, Ph.D. Definition: The permissible exposure limit (PEL) is the time-weighted average threshold limit a person working an 8 hour shift can be exposed to a chemical without suffering ill effects. This value is used in the United States by OSHA to protect workers in hazardous conditions.y Anne Marie Helmenstine, Ph.D. Definition: The permissible exposure limit (PEL) is the time-weighted average threshold limit a person working an 8 hour shift can be exposed to a chemical without suffering ill effects.