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azotobacter    
固氮细菌; 自生固氮菌

固氮细菌; 自生固氮菌


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  • Azotobacter - Encyclopedia. com
    Azotobacter The genus Azotobacter is comprised of bacteria that require the presence of oxygen to grow and reproduce, and which are inhabitants of the soil There are six species of Azotobacter The representative species is Azotobacter vinelandii
  • Jefferson, Thomas - Encyclopedia. com
    Thomas Jefferson Born April 13, 1743 (Shadwell, Virginia) Died July 4, 1826 (Monticello, Virginia) U S president, vice president, secretary of state, scientist, inventor, philosopher, foreign diplomat, architect Thomas Jefferson, a slave-owning aristocrat and philosopher who believed in reason, science, and education, was the primary spokesman for the common people in the early years of the
  • World Health Organization - Encyclopedia. com
    WORLD HEALTH ORGANIZATION The World Health Organization (WHO) was created in 1948 by member states of the United Nations [1] (UN) as a specialized agency with a broad mandate for health The WHO is the world's leading health organization
  • Henry Viii | Encyclopedia. com
    HENRY VIII (ENGLAND) (1491 – 1547; ruled 1509 – 1547) HENRY VIII (ENGLAND) (1491 – 1547; ruled 1509 – 1547), king of England Henry VIII has a good claim to be regarded as England's most important monarch It was he who initiated and pushed through the seminal event in the nation's history, the break with the church of Rome Though historians have long debated the king's motivations
  • Hudsons Bay Company | Encyclopedia. com
    Hudson ’ s Bay Company 401 Bay Street Toronto, Ontario M5H 2Y4 Canada (416) 861-6112 Fax: (416) 861-4720 Public Company Incorporated: 1670 Employees: 60,000 Sales: C$4 97 billion (US$4 28 billion) Stock Exchanges: Montreal Toronto Hudson ’ s Bay Company is Canada ’ s oldest corporation On May 2, 1670, King Charles II granted 18 investors a charter incorporating them as the Governor and
  • Don Quixote - Encyclopedia. com
    Don Quixote Miguel de Cervantes Saavedra 1605 Introduction Author Biography Plot Summary Characters Themes Style Historical Context Critical Overview Criticism Sources For Further Study Introduction In 1605 a novel appeared that has become one of the most beloved stories of European literature It was the history of Don Quixote, the tall, gaunt knight-errant astride his fallible steed, with
  • Physics: Newtonian Physics - Encyclopedia. com
    Physics: Newtonian PhysicsIntroductionNewtonian physics, also called Newtonian or classical mechanics, is the description of mechanical events—those that involve forces acting on matter—using the laws of motion and gravitation formulated in the late seventeenth century by English physicist Sir Isaac Newton (1642–1727) Source for information on Physics: Newtonian Physics: Scientific
  • Nitrogen Fixation - Encyclopedia. com
    Nitrogen Fixation Biological nitrogen (N 2) fixation is the reduction of atmospheric nitrogen gas to ammonia, according to the equation: N 2 + 10H + 8 e - 16ATP + 2NH 4+ + H 2 + 16ADP + 16P i The reaction is mediated by an oxygen-sensitive enzyme nitrogenase and requires energy, as indicated by the consumption of adenosine triphosphate (ATP ) This conversion of inert N 2 gas into a form
  • Prussia - Encyclopedia. com
    PRUSSIA PRUSSIA (Ger Preussen ), former dukedom and kingdom, the nucleus and dominant part of modern united *Germany (1870) The name came to signify a conglomerate of territories whose core was the electorate of *Brandenburg, ruled by the Hohenzollern dynast from the capital, *Berlin 1300–1740 The order of Teutonic Knights, who ruled East Prussia from the 13 th century, in 1309 expressly
  • Betsy Ross | Encyclopedia. com
    Betsy Ross Although the evidence is not solid, most historians point to upholsterer Betsy Ross (1752-1836) as the woman who sewed the first U S flag On June 14, 1777, the Continental Congress, on a motion from John Adams, adopted the stars and stripes as the national flag History leaves its students with very few clues as to who designed and created the original flag, but it has been long





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