cells. They asked which part of the virus is responsible to enter the E. coli cell during infection‚ DNA or protein? In their experiment‚ they used radioactive isotopes to tag phage DNA (radioactive phosphorus) and protein (radioactive sulfur) because protein contains sulfur and DNA contains phosphorus hence the reason behind the radioactive isotopes. They then allowed separate samples of nonradioactive E. coli cells to be infected by the protein and DNA labeled batches of T2. Then they tested to
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1. The earth consists of iron‚ oxygen‚ silicon and magnesium. This makes up about 90% of the earth’s elements. Jupiter and Saturn on the other hand consist mostly of volatile gases like water‚ methane and ammonia. These two planets retained their volatiles due to their greater gravitational force. 2. Scientist believe that the collision of earth with a smaller body caused the earth to tilt on it axis at 23 degrees. The blasting debris is said to have formed the moon. The period from the accretion
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Problem Set - Small Molecules (Campbell Chapters 2 and 3) 1. What are the SPONCH elements and what is common among these elements that make them suitable for life? State the four most frequently occurring of the SPONCH elements. Which of the SPONCH elements is found in each of the large biomolecules (carbohydrates‚ proteins‚ lipids‚ nucleic acids). The SPONCH elements are Sulfur‚ Phosphorus‚ Oxygen‚ Nitrogen‚ Carbon and Hydrogen. These are the five key elements that compose living
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neutron number may vary‚ so mass number (protons + neutrons) may vary. However‚ the same element may contain varying numbers of neutrons; these forms of an element are called isotopes. The chemical properties of isotopes are the same‚ although the physical properties of some isotopes may be different. Some isotopes are radioactive-meaning they "radiate" energy as they decay to a more stable form‚ perhaps another element half-life: time required for half of the atoms of an element to decay into stable
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2.8.1 Enrichment Instructions: This is an honors level course. Answer all questions fully using complete sentences. If you want full credit‚ please provide plenty of details. 1) What is a medical imaging device? Medical imaging comprises different imaging modalities and processes to image human body for diagnostic and treatment purposes and therefore has an important role in the improvement of public health in all population groups. Furthermore‚ medical imaging is justified also to follow the
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Reservoir Geoscience Dr Essam Mansour Ahmed Associated professor Geoscience & Petroleum Engineering Department Universiti Teknologi PETRONAS Bandar Seri Iskandar‚ 31750 Tronoh‚ Perak Darul Ridzuan‚ Malaysia D/L:605-368 7290 Email: essam.mansour@petronas.com.my 14-03-35 Learning Outcomes Students should be able to : Interpret the Depositional Environment of sedimentary rocks Analyze petrophysical properties and subsurface facies from log and seismic Interpret Reservoir
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thirty-six and the atomic mass is 83.80. There are thirty-seven different isotopes in the element‚ krypton. Scientists that Discovered Krypton: Morris Travers is a British chemist who was born on January 24‚
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known as electrons. In 1906 he began studying positive rays .Thomson won the 1905 nobel prize among many accolades.Then he discovered in 1912 that neon was composed of two different types of atoms. He created the first evidence for isotopes of a stable (non -radioactive) element in 1913‚as part of his explo oseph John Thomson was born on December 18‚1856 in Cheetham hill‚England.As a boy he was curius. His father was a bookseller .He was responsible for Thomson’s interest for science.Thomson would
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When a really large unstable isotope changes into to smaller isotopes that are 2 completely different elements. the nucleus has to be larger than 230(mass). They are really slow and spontaneous. Fission = splitting. Can create a chain reaction. (picture above). Critical mass= must be enough mass in a reaction or enough fission type mass‚ fissionable mass‚ for the reaction to continue to go on.(minimum amount). Sub critical mass= mass of fission material that doesn’t have enough to keep the reaction
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Nuclear Energy: How Fukushima Changed Everything. After the Chernobyl disaster of April 26th‚ 1986‚ it was often said that the nuclear industry no longer had the resilience to survive another major nuclear accident. The industry hoped that the sentiment behind the Chernobyl accident could be eased on the basis that it was the consequence of a flaw in design that was unique to the Soviet Union’s reactors and that they had been operated in such a way that would not have been acceptable in the
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