REPLICA PLATING AND INDIRECT SELECTION OF BACTERIAL MUTANTS JOSHUA LEDERBERG AND ESTHER M. LEDERBERG Department of Genetics‚ ’ College of Agriculture‚ University of Wisconsin‚ Madison‚ Wisconsin Received for publication August 31‚ 1951 Elective enrichment is an indispensable technique in bacterial physiology and genetics (van Niel‚ 1949). Specific biotypes are most readily isolated by the establishment of cultural conditions that favor their growth or survival. It has been repeatedly questioned
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1. The science of biogeography is the description of distribution of life and the explanation of this description. The description is based on both time and space. This describes how things look and why they are there. It also looks to answer the question – are these features the same over time? Biogeography arose with the theory that life on earth is a non-random distribution. This is the most important observation leading to the field of biogeography. The study of biogeography includes many other
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method employed to evaluate the effectiveness of antiseptic agents against selected test organism. In this method‚ sterile filter paper disk is impregnated with an antiseotic and placed on fresh heavily inoculated agar plate of a test organism. Following incubation‚ the agar plate is looked for a zone of inhibition. The presence of a clear zone of inhibition surrounding the disk is indicative of inhibitory (antimicrobial) activity against the organism. This experiment deal with the evaluation of
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Paper: Mantle Convection‚ The Forces Behind Plate Motion PHSC 210-Spring B Term‚ Elements of Earth Science February ‚ 2014 Short Paper: Mantle Convection‚ The Forces Behind Plate Motion Introduction The paper is about plate mantle convection‚ the forces behind plate motion. Lutgens & Tarbuck (2014) found “Convection is a type of heat transfer that involves the actual movement of a substance” (p. 177). Plate mantle convection is described by Merriam-Webster’s
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with the African plate becoming part of a supercontinent. During one of earlier collisions‚ tremendous heat and pressure were generated. This changed the Smoky sedimentary rocks. For example‚ sandstone became recrystallized into quartzite and shale became slate. The last great episode of the mountain building uplifted the entire Appalachian mountain chain from Newfoundland‚ Canada to Alabama. The mountains then were much higher than they are today. As the African tectonic plate gradually pushed
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rough edges and lines making it look a bit like a jigsaw puzzle.The energy stored here causes the pieces to slide‚ glide‚ knock and move around each piece. These pieces are also known as tectonic plates.
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the world and in relation to tectonic plate boundaries. For example you have highly destructive and explosive volcanoes often found along destructive plate boundaries because of increased pressure within the subduction zone. An example of this is the Philippines‚ which is situated above a destructive plate boundary and this leads to numerous and highly destructive volcanic eruptions. You also find volcanoes along constructive plate boundaries where the plates are moving apart and this is creating
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CHAPTER I INTRODUCTION Background of the Study Mangrove swamps are forested intertidal ecosystems that occupy sediment-rich sheltered tropical coastal environments. By trapping and stabilizing fine sediments‚ mangroves control the quality of marine coastal waters. Aside from maintaining coastal food webs and populations of animals‚ mangroves have an important role in pollution control through their absorptive capacity for organic pollutants and nutrients‚ and they play an important role in storm
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The Alps are the youngest and highest mountain system in Europe. They stretch across the western and southern part of the continent in a broad arc. The mountain range startsnear the Mediterranean Seaon the border between France and Italy. Then it curves north- and eastward through northern Italy‚ Switzerland Liechtenstein‚ southern Germany‚ Austria and Slovenia. The Alps are about 1‚000 km long‚ the broadest section over 260 km wide. The highest peak‚ Mont Blanc‚ situated on the border between
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occur both on land and sea.They may occur at areas where plates collide (subduction zones/ convergent plate margins) ; where plates slide past eachother along fault lines (transform plate margins) or due to volcanic eruption. Earthquakes may be of three different categories: * Tectonic – movement in the earth’s crust due to sudden movement along fault lines. * Plutonic - occurs deep within the subduction zone of colliding plates. * Volcanic – earthquakes accompanied by molten lava
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