The Life Of LOUIS PASTEUR Essays - Food Preservation, Food Science

The Life Of LOUIS PASTEUR Essays - Food Preservation, Food Science The Life of LOUIS PASTEUR Louis Pasteur was born on December 27, 1822, in D?le, a small town in France. He grew in a humble family and his father was a tanner. He graduated in 1840 from the College of Arts at Besancon and entered the prestigious Ecole Namale Supervieure, Paris, to work for his doctorate degree. He chose for his studies the then obscure science of crystallography, which was to have a great influence on his career. Pasteur entered the scientific world as a professor of physics at the Lycee of Tournon and started his research on the optical properties of crystals of tartaric acid salts. He found the two forms of this acid which could rotate the plane of polarization of light, one to the right and the other to the left. This was his first important discovery in crystallography, the phenomenon of optical isomers. Paradoxically it incited him to abandon the field. But it won the acclaim of the French Academy and Britain's Royal Society. Thus Pasteur became famous at the age of 26. Pasteur soon began researching the complexities of bacteriology. The prevalent theory of life at the time was spontaneous generation which states that certain forms of life such as flies, worms, and mice can develop from non-living matter such as mud and decaying fish. Pasteur disproved this theory with a simple experiment. He showed that microorganisms would grow in sterilized broth only if the broth was first exposed to air containing spores, or reproductive cells. His findings led to the development of the cell theory of the origin of living matter which states that all life originates from preexisting living material. In 1849, Pasteur became professor of chemistry at the University of Strasbourg, where he began studying fermentation, a type of chemical breakdown of substances by microbes. He served the rest of his career as Dean of Sciences at the University of Lille. Soon after his arrival at Lille, Pasteur was asked to solve the problems of the local industries, vinegar and silk manufacture. A producer of vinegar from beet juice wanted to know why the product was sometimes spoilt. On examining the juice microscopically, Pasteur observed that the contaminant, amyl alcohol, was optically active. This gave clear evidence that it was produced by a living organism. Pasteur then proposed a biological interpretation of the process of fermentation. He demonstrated that when no contamination by living contagion took place, the process of fermentation or putrefaction did not take place. Thus the celebrated techniques of Pasteurization, came into being, it could not only preserve wine and milk but drastically cut inflation in the surgeon's operating table. Today pasteurization follows closely the early techniques of Louis Pasteur. In the case of milk pasteurization, the milk is heated to 161?F for 15 seconds followed by a rapid cooling to 50?F or lower. This process removes any unwanted bacteria, but also kills any beneficial bac! teria and reduces some of the nutritive property of milk. The Franco-Prussian War opened an avenue to press his microbial theory of infection, he got the grudging agreement of the military medical corps to sterilize instruments and steam bandages. As a result, thousands of lives were saved. In 1873, Pasteur was elected to the French Academy of Medicine, a spectacular achievement for a person without a medical degree. Pasteur was now ready to move from the simpler forms of life in the microbial world to the diseases of the higher animals. The opportunity came through a devastating outbreak of anthrax, a killer plague of sheep in 1876. Pasteur tried to produce pure cultures, his objective was to fight the disease and not just to describe it. Pasteur had accidentally forgotten in a corner of the laboratory a culture of fowl cholera and noticed that it had lost some of its virulence. Then he vaccinated some chicken which resisted the disease. The same technique, after improvement, was applied against bacillus anthracis: sheep inoculated with the vaccine survived and the non-vaccinated ones died. A scourge that had crippling economic effects was brought under control. Simultaneously, the principle of immunization or the protection of the body through vaccines was discovered. In 1865, the silk industry of France faced an economic ruin by an epidemic among silkworms.

The Consequences of World War I

The Consequences of World War I World War I was fought on battlefields throughout Europe between 1914 and 1918. It involved human slaughter on a previously unprecedented scale- and its consequences were enormous. The human and structural devastation left Europe and the world greatly changed in almost all facets of life, setting the stage for political convulsions throughout the remainder of the century. A New Great Power Before its entry into World War I, the United States of America was a nation of untapped military potential and growing economic might. But the war changed the United States in two important ways: the countrys military was turned into a large-scale fighting force with the intense experience of modern war, a force that was clearly equal to that of the old Great Powers; and the balance of economic power began to shift from the drained nations of Europe to America. However, the dreadful toll taken by the war led U.S. politicians to retreat from the world and return to a policy of isolationism. That isolation initially limited the impact of Americas growth, which would only truly come to fruition in the aftermath of World War II. This retreat also undermined the League of Nations and the emerging new political order. Socialism Rises to the World Stage The collapse of Russia under the pressure of total warfare allowed socialist revolutionaries to seize power  and turn communism, one of the world’s growing ideologies, into a major European force. While the global socialist revolution that Vladimir Lenin believed was coming never happened, the presence of a huge and potentially powerful communist nation in Europe and Asia changed the balance of world politics. Germanys politics initially tottered toward  joining Russia, but eventually pulled back from experiencing a full Leninist change and formed a new social democracy. This would come under great pressure and fail from the challenge of Germanys right, whereas Russias authoritarian regime after the tsarists lasted for decades. The Collapse of Central and Eastern European Empires The German, Russian, Turkish, and Austro-Hungarian Empires all fought in World War I, and all were swept away by defeat and revolution, although not necessarily in that order. The fall of Turkey in 1922 from a revolution stemming directly from the war, as well as that of Austria-Hungary, was probably not that much of a surprise: Turkey had long been regarded as the sick man of Europe, and vultures had circled its territory for decades. Austria-Hungary appeared close behind. But the fall of the young, powerful, and growing German Empire, after the people revolted and the Kaiser was forced to abdicate, came as a great shock. In their place came a rapidly changing series of new governments, ranging in structure from democratic republics to socialist dictatorships. Nationalism Transforms and Complicates Europe Nationalism had been growing in Europe for decades before World War I began, but the wars aftermath saw a major rise in new nations and independence movements. Part of this was a result of Woodrow Wilson’s isolationist commitment to what he called self-determination. But part of it was also a response to the destabilization of old empires, which nationalists viewed as an opportunity to declare new nations. The key region for European nationalism was Eastern Europe and the Balkans, where Poland, the three Baltic States, Czechoslovakia, the Kingdom of the Serbs, Croats, and Slovenes, and others emerged. But nationalism conflicted hugely with the ethnic makeup of this region of Europe, where many different nationalities and ethnicities sometimes lived in tension with one another. Eventually, internal conflicts stemming from new self-determination by national majorities arose from disaffected minorities who preferred the rule of neighbors. The Myths of Victory and Failure German commander Erich Ludendorff suffered a mental collapse before he called for an armistice to end the war, and when he recovered and discovered the terms he had signed onto, he insisted Germany refuse them, claiming the army could fight on. But the new civilian government overruled him, as once peace had been established there was no way to keep the army fighting. The civilian leaders who overruled Ludendorff became scapegoats for both the army and Ludendorff himself. Thus began, at the very close of the war, the myth of the undefeated German army being stabbed in the back by liberals, socialists, and Jews who had damaged the Weimar Republic and fueled the rise of Hitler. That myth came directly from Ludendorff setting up the civilians for the fall. Italy didn’t receive as much land as it had been promised in secret agreements, and Italian right-wingers exploited this to complain of a mutilated peace. In contrast, in Britain, the successes of 1918 which had been won partly by their soldiers were increasingly ignored, in favor of viewing the war and all war as a bloody catastrophe. This affected their response to international events in the 1920s and 1930s; arguably, the policy of appeasement was born from the ashes of World War I. The Largest Loss: A Lost Generation While it is not strictly true that a whole generation was lost- and some historians have complained about the term- eight million people died during World War I, which was perhaps one in eight of the combatants. In most of the Great Powers, it was hard to find anyone who had not lost someone to the war. Many other people had been wounded or shell-shocked so badly they killed themselves, and these casualties are not reflected in the figures.