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.
1 A Permissible Exposure Limit (PEL) is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations. 2  A Time-Weighted Average (TWA) is explained below. 3  A VPEL or Vacated PEL is an older PEL set by OSHA but later vacated (retracted) under court order. A Permissible Exposure Limit (PEL) is the maximum amount or concentration of a chemical that a worker may be exposed to under OSHA regulations. 2  A Time-Weighted Average (TWA) is explained below. 3  A VPEL or Vacated PEL is an older PEL set by OSHA but later vacated (retracted) under court order.