Certain reversible surfactants, treatment fluids, and methods of use employing such reversible surfactants in subterranean applications are provided. The laser diode includes a laminated body including an active layer and a current narrowing layer on a substrate. Aspects of the present invention relate to the use of the soluble oat flour in liquid food products such as beverages, semi-solid food products such as yogurt, and solid food products such as bakery items in order to provide enhanced health benefits. The fiber optic connector holder is configured to receive a fiber optic connector with a dust cap mounted about a ferrule and polished end face of an optical fiber held by the ferrule. Certain specific spacings of adjacent rows of photosensors are particularly useful in operating the apparatus at different commonly-used output speeds. After application of the wound cover to skin for use, the carrier is removable from the wound cover to leave the wound cover adhered to the skin.