however‚ without enzymes‚ these reactions could possibly take several years to complete. An enzyme is a macromolecule‚ generally a protein‚ that lowers the activation energy of a reaction without being changed by the reaction‚ and this causes the reaction to occur much faster than usual (Campbell et al.‚ 2014). The act of speeding of a chemical reaction is called catalysis‚ and molecules that perform this are called catalyst. Enzymes act as catalysts‚ and there a many types of enzymes that perform many
Premium Enzyme Chemical reaction Metabolism
Tacitus composed Germania in order to illustrate his cynical assessment of the Germans and their nation. Tacitus presented thorough descriptions of what the German citizens looked like and the disorderly way their country was set up. Tacitus also emphasized the significance of family life for most Germans‚ the nonimportance of a class system to the Germans‚ and the violent behaviors German individuals often impulsively resorted to. Tacitus provided this information in a negative way to expression
Premium Germany Roman Empire Sociology
The nineteenth century was a period of awareness to American letters. The influence of European Romanticism yielded the way to a transcendent character. This period saw the emergence of a movement called Transcendentalism‚ which was born as a form of rejection of strict Puritan religious attitudes from New England‚ where the movement originated. The Transcendentalists were influenced by Romanticism‚ especially in areas such as self- examination‚ the exaltation of individualism‚ and the beauties of
Premium Ralph Waldo Emerson Transcendentalism Romanticism
The Louisiana Purchase took place in 1803‚ by President Thomas Jefferson. It was a huge land deal between France and The United States. In this purchase‚ the United States of America paid fifteen million dollars to get all the land west of the Mississippi River and east of the Rocky Mountains. This historic event doubled the size of the U.S. by one simple signature. The Louisiana Purchase was the best purchase ever made by the United States. The purchase of this land increased the economic resources
Premium United States Louisiana Purchase Mississippi River
What would you do if one country’s dominance over your country changed your life for the worse? This is what was occurring to the lithuanians. During Stalin’s rule‚ There were many things he did to ensure soviet dominance. Stalin had a five year plan. This five year plan was to gain complete soviet dominance through the secret deportation of Lithuanians to siberia. The lithuanians faced many hardships not only in Siberia but on the way there as well. The first part of the plan was to deport them
Premium Soviet Union Russia World War II
amphitheater ever built‚ whose appearance symbolizes the power and grandeur of the Roman Empire. The Colosseum was one of the most important and influential aspects to Ancient Rome. It displayed the Roman’s technology of engineering along with providing a form of entertainment for the Roman people. In 70 CE‚ under the emperor Vespasian‚ the Romans began the revolutionary construction of what was the greatest architectural achievement of its time. In order for the Romans to effectively and efficiently
Premium Roman Empire Rome Ancient Rome
believed that it was wrong to capture‚ enslave and ship Africans to America to work in harsh conditions for free for White owners. The South‚ on the other hand believed slavery was right and should be used for helping the economy and producing cash crops so the North could use the supplies to make products. But the addition of new states‚ especially an uneven number made the tension grow between the two sides on the decision of slavery. The purpose of the Missouri Compromise was to remove sectional
Premium American Civil War Slavery in the United States Slavery
the mission was to launch the second part of the TDRS-B to improve the older version. A TDRS-B is a satellite that transports data from space to Earth. It was also supposed to have the first non-astronaut in space for the Teacher in Space Program. But 73 seconds into the launch the Challenger exploded killing all seven crew members. It will still continue to be known as a great disaster in NASA that affected many of their ways of doing things. The purpose of the Challenger mission was to improve
Premium Space Shuttle Space Shuttle Columbia Space Shuttle Challenger
Graham Condon Effects of Global Warming The effects of global warming are of concern–both for the environment and human life. Many effects thought to be unlikely are now being observed because of the dire consequences that may result if ignored. Here‚ we look at: melting of glaciers‚ increase of severe weather‚ and the social effects related to global warming. Because glaciers are made of fresh water‚ their melting will not only raise sea
Premium Global warming Carbon dioxide Ocean
fitting. The combustion gases are ejected rearward without being fed through a nozzle. Sonic velocity is achieved downstream of the ducts. Experimental results are presented for four nozzleless motors of different length-diameter (L/D) ratios using two different composite propellants. The experimental observations discussed are: the premature unchoking in motors of insufficient L/D ratios and the tendency for the propellant to extinguish under highly negative pressure gradient environment‚ both
Free Rocket Internal combustion engine Oxygen