Mr. Do! (ミスタードゥ Misutā Du) is an arcade game created by Universal in 1982. Similar in some ways to Namco's popular Dig Dug title, Mr. Do! was also popular and saw release on a variety of home video game consoles and systems. It is the first game in the Mr. Do series, and was released both as a standalone game and as a conversion kit (released by Taito Corp.) for existing arcade cabinets. It was one of the first arcade games to be released as a conversion kit, and went on to sell 30,000 units in the United States. It was remade in Japan as Neo Mr. Do! (ネオミスタードゥ Neo Misutā Du). It was also a popular choice on the 1983 video arcade-based game show Starcade.
The object of Mr. Do! is to score as many points as possible by digging tunnels through the ground and collecting cherries. The title character, Mr. Do (a circus clown—except for the original Japanese version of the game in which he is a snowman. See flyer image at right of this text), is constantly chased by red monsters resembling small dinosaurs, and the player loses a life if Mr. Do is caught by one. The game is over when the last life is lost.
Ov or OV may refer to:
Vanadium(III) oxide is the inorganic compound with the formula V2O3. It is a black solid prepared by reduction of V2O5 with hydrogen or carbon monoxide.It is a basic oxide dissolving in acids to give solutions of vanadium(III) complexes. V2O3 has the corundum structure. It is antiferromagnetic with a critical temperature of 160 K. At this temperature there is an abrupt change in conductivity from metallic to insulating.
Upon exposure to air it gradually converts into indigo-blue V2O4.
In nature it occurs as the very rare mineral karelianite.
Vanadium(V) oxide (vanadia) is the inorganic compound with the formula V2O5. Commonly known as vanadium pentoxide, it is a brown/yellow solid, although when freshly precipitated from aqueous solution, its colour is deep orange. Because of its high oxidation state, it is both an amphoteric oxide and an oxidizing agent. From the industrial perspective, it is the most important compound of vanadium, being principal precursor to alloys of vanadium and is a widely used industrial catalyst.
The mineral form of this compound, shcherbinaite, is extremely rare, almost always found among fumaroles. A mineral trihydrate, V2O5·3H2O, is also known under the name of navajoite.
Upon heating, it reversibly loses oxygen, successively forming V2O4, V2O3, VO and the metal.
Unlike most metal oxides, it dissolves slightly in water to give a pale yellow, acidic solution. When this compound is formed by V2O5 it is an amphoteric oxide. Thus :V2O5 reacts with strong non-reducing acids to form solutions containing the pale yellow salts containing dioxovanadium(V) centers: