The power forward known as the four, is one of the five positions in a regulation basketball game. Power forwards play a role similar to that of center, they play offensively with their backs towards the basket and position themselves defensively under the basket in a zone defense or against the opposing power forward in man-to-man defense. The power forward position entails a variety of responsibilities, one of, rebounding. Many power forwards are noted for their mid-range jump-shot, several players have become accurate from 12 to 18 feet. Earlier, these skills were more exhibited in the European style of play; some power forwards, known as stretch fours, have since extended their shooting range to three-point field goals. In the NBA, power forwards range from 6′ 6″ to 6′ 10″ without shoes while in the WNBA, power forwards are between 6′ 0″ and 6′ 3″. Despite the averages, a variety of players fit "tweener" roles which finds them in the small forward or center position depending on matchups and coaching decisions.
Some power forwards play the center position and have the skills, but lack the height, associated with that position. Power forwards that are inducted in the Naismith Memorial Basketball Hall of Fame include Karl Malone, Denise Curry, Dolph Schayes, Kevin McHale, Charles Barkley, Elvin Hayes, Bob Pettit, Dennis Rodman, Katrina McClain Johnson
The Lewiston–Queenston Bridge known as the Queenston–Lewiston Bridge, is an arch bridge that crosses the Niagara River gorge just south of the Niagara Escarpment. The bridge was opened on November 1, 1962, it is an international bridge between the United States and Canada. It connects Interstate 190 in the town of Lewiston, New York to Highway 405 in the community of Queenston, Ontario; the Lewiston–Queenston Bridge is a twin of the Rainbow Bridge at Niagara Falls and designed by Richard Lee. Customs plazas are located on both ends of the bridge, with tolls only being charged on entering Canada; the bridge accepts E-ZPass electronic toll collection and houses the second Canadian E-ZPass collection facility, after the nearby Peace Bridge. Two duty-free stores are located between the two plazas; the bridge permits no pedestrians. The Lewiston–Queenston Bridge lacks expedited border clearance facilities for NEXUS and FAST card holders traveling from Canada to the United States, but does have a NEXUS lane for travel into Canada.
Gantries have lights indicating the direction of traffic. Speed limit is posted in miles per hour along the bridge. Canadian and United States flags fly at the midpoint on the south side of the bridge. There are toll plazas for customs clearance on either side of the bridge; the toll plaza for payment for use of the bridge is on the Canadian side only. Canada bound: 10 customs booths for cars/RVs 5 customs booths for trucks Dedicated Bus Processing Lane parking area for trucks for inspections helipad 6 toll booths US bound: 6 customs booths for cars/buses/RVs 3 customs booths for trucks parking area for trucks for inspectionsHigh mast lighting is used on the Canadian side with regular light standards used for bridge and US toll plaza; the first Queenston-Lewiston Bridge was built in 1851 by engineer Edward Serrell and wrecked by wind in 1864. Some of the cables were still in place as late as 1895; the road deck span was about 841–849 ft. The suspension bridge design was unusual because the cables were attached to the cliff with only small towers.
This made the road deck span shorter than the cable span of 1,040 feet. A second bridge called the Queenston-Lewiston Bridge, a suspension bridge was constructed. Located seven-tenths mile north, the suspension bridge was built near the location of the present-day Rainbow Bridge, was moved to Queenston in 1898 by R. S. Buck and engineer L. L. Buck, after the completion of the Rainbow Bridge's predecessor, the Upper Steel Arch Bridge; the suspension bridge was dismantled in 1963 after the current bridge was opened. Reminders of the earlier bridge are still visible in the area. First is two columns. Second is the original plaque, now located midspan alongside the road, right at the border between the two countries; the plaque is flanked by a Canadian flag. The supports are part of Owen Morrell's Omega, a steel sculpture and observation platform added in 1981. Two columns remain on the Canadian side at the foot of York Street in a wooded area now known as York Park. On December 1, 1961, while the bridge was under construction, an F-100 fighter caught fire just after taking off from a base near Niagara Falls, New York.
To protect people in the city, the pilot steered it into the Niagara River gorge before safely ejecting. It passed not far over the heads of workers near the site, missed a construction crane by about 100 feet, crashed into the gorge side about 600 feet beyond the bridge before falling into the river; the crossing is the fourth-busiest on the Canada–United States border, with delays of up to two hours. It is on the most direct route connecting the US Interstate system to Detroit. Canada replaced its border inspection facilities in 2011; the United States continues to use its original 1962 border inspection facilities. Both facilities are open 365 days per year. All commercial vehicles crossing between the US and Canada in the Niagara Falls area must use this crossing. Transport portal Engineering portal New York portal Ontario portal List of Canada–United States border crossings List of crossings of the Niagara River List of bridges in the United States by height Lewiston-Queenston Bridge at Structurae Niagara Falls Bridge Commission Images from the Niagara Historic Digital Collections Live Traffic Camera of Lewiston Queenston Bridge Lewiston Queenston Bridge Collection of Images Niagara Falls Public Library
The parDE type II toxin-antitoxin system is one example of the bacterial toxin-antitoxin systems that encode two proteins, one a potent inhibitor of cell proliferation and the other its specific antidote. These systems preferentially guarantee growth of plasmid-carrying daughter cells in a bacterial population by killing newborn bacteria that have not inherited a plasmid copy at cell division. ParD is a plasmid anti-toxin, it stabilises plasmids by inhibiting ParE toxicity in cells that express ParD and ParE. ParD forms a dimer and regulates its own promoter; as with CcdB the toxin target is DNA gyrase. Induction of ParE toxin results in inhibition of cell division but not cell growth; the parD and ccD systems are found to be strikingly similar in terms of their structures and actions. The antitoxin protein of each system interacts with its cognate toxin to neutralise the activity of the toxin and in the process the complex of the two becomes an efficient transcription repressor. Toxin-antitoxin database