regular light and shadow images and objects can be made visible on a fluorescent screen coated with barium platinocyanide. When an x-ray passes through a substance‚ diffraction phenomena occur that reveal the wave character of radiation. An interference pattern composed of dots can be formed on a photographic plate. These diffraction patterns were 1st studied by M. Von Laue‚ known as the Laue "x" patterns.(Simon and Schuster) Over time the world has created many pieces of technology that are important
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development of pharmaceuticals that can enhance or inhibit certain proteins in a variety of signaling pathways. To determine protein structures‚ a general protocol of steps must be followed. Proteins must be purified‚ crystallized‚ and then through x-ray diffraction techniques a structure can be determined. However‚ the most crucial part of structure determination is the crystallization of a protein. A protein can be difficult to crystallize because an optimal environment must be found by adjusting temperature
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Available online at www.sciencedirect.com Chinese Chemical Letters 20 (2009) 889–892 www.elsevier.com/locate/cclet Highly selective CO methanation over amorphous Ni–Ru–B/ZrO2 catalyst Qi Hai Liu‚ Xin Fa Dong *‚ Wei Ming Lin School of Chemistry and Chemical Engineering‚ South China University of Technology‚ Guangzhou 510640‚ China Received 15 December 2008 Abstract Amorphous Ni–Ru–B/ZrO2 catalyst was prepared by the means of chemical reduction‚ and selective CO methanation as a strategy
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atomic weight? A =18.91 g/cm3 × 3.75x10−24 cm3 × 6.023x1023 = 42.7 g/mol 3.65 Figure 3.24 shows the first five peaks of the x-ray diffraction pattern for tungsten‚ which has a BCC crystal structure; monochromatic x-radiation having a wavelength of 0.1542 nm was used. a. Index (i.e. give h‚ k and l indices) for each of these peaks. The five peaks result by diffraction from the following planes: 110‚200‚211‚220 and 310. b. Determine the interplanar spacing for each of the peaks. c. For each peak
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Quartz-type FePO4 was investigated from 294 up to 1073K by neutron powder diffraction. The cell parameters and fractional atomic coordinates in the α phase tend towards the values found in the β phase. The first order transition of FePO4 is at 980 K‚ during which several observations are made. Firstly‚ the cell parameters and fractional atomic coordinates show discontinuous shifts. Secondly‚ the intensities of a large number of diffraction lines decrease‚ as shown in Fig. 1. Lastly‚ bond distances and angles
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Experiment 9: THE TANGENT GALVANOMETER; PURPOSE: In this experiment we will measure the magnitude of the horizontal component of the Earth’s Magnetic field by the use of an instrument called a tangent galvanometer. INTRODUCTION: A tangent galvanometer consists of a number of turns of copper wire wound on a hoop. At the center of the hoop a compass is mounted. When a direct current flows through the wires‚ a magnetic field is induced in the space surrounding the loops of
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He wrote many papers and the subjects of the papers he published reflect his amazing scientific versatility. He published about 350 publications in the fields of: experimental determination of the structure of crystals by the diffraction of X-rays and the interpretation of these structures in terms of the radii and other properties of atoms; the application of quantum mechanics to physical and chemical problems‚ dielectric constants‚ X-ray doublets‚ momentum distribution of electrons
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Section 1 : Identifying the Genetic Material Griffith’s Experiments In 1928‚ Frederick Griffith‚ a bacteriologist‚ was trying to prepare a vaccine against pneumonia. A vaccine is a substance that is prepared from killed or weakened disease-causing agents‚ including certain bacteria. The vaccine is introduced into the body to protect the body against future infections by the disease-causing agent. Griffith discovered that harmless bacteria could turn virulent when mixed with bacteria that cause
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DEOGRACIAS P. PRINCESA MEMORIAL HIGH SCHOOL Ranao – Ranao‚ Ligao City LONG TEST IN SCIENCE IV (PHYSICS) MULTIPLE CHOICE. Read each item carefully and write the letter of the BEST answer in your answer sheets. 1. What is needed for sound to spread and travel? a. Force b. Medium c. Wires d. Sound wave 2. All of these are media in which sound waves can travel EXCEPT a. Solid b. Liquid c. Gas d. Vacuum 3. Why do people in upland areas speak louder than the normal voice
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