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The Dean–Stark method is commonly used to measure moisture content of items such as bread in the food industry. This equipment can be used in cases other than simple removal of water. One example is the esterification of butanol with acetic acid catalyzed by sulfuric acid. The vapor contains 63% ester, 29% water and 8% alcohol at reflux ...
Glass float - Wikipedia ... Glass float
A fish trap is a trap used for catching fish and other aquatic animals of value. Fish traps include fishing weirs, cage traps, fish wheels and some fishing net rigs such as fyke nets. [ 1 ] The use of traps are culturally almost universal around the world and seem to have been independently invented many times.
Fishing weir - Wikipedia ... Fishing weir
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The Brewarrina Aboriginal fish traps is the largest system of traditional fish traps recorded in Australia. Its unusual, innovative and complex design demonstrates the development of a highly skilled fishing technique involving a thorough understanding of dry stone wall construction principles, river hydrology and fish biology.
Cleaning station. A reef manta ray at a cleaning station, maintaining a near stationary position atop a coral patch for several minutes while being cleaned. A rockmover wrasse being cleaned by Hawaiian cleaner wrasses on a reef in Hawaii. Some manini and a filefish wait their turn. A cleaning station is a location where aquatic life congregate ...
Cleaner fish interaction durations and memories of reoccurring clients are influenced by the neuroendocrine system of the fish, involving hormones arginine vasotocin, Isotocin and serotonin. [3] Conspicuous coloration is a method used by some cleaner fish, where they often display a brilliant blue stripe that spans the length of the body. [9]
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