int/malaria/world_malaria_report_2010/en/index.html 2 Outline • Basics of cell biology literature reading • Imaging (I): light microscopy • Imaging (II): electron microscopy • Basics of the diffusion theory 3 Outline • Basics of cell biology literature reading • Imaging (I): light microscopy • Imaging (II): electron microscopy • Basics of the diffusion theory 4 Why Focus on Literature Reading? • Biology is a scientific discipline undergoing rapid development. • For in-depth
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other cell through cell division 5 types of different Microscopes 1. Light Microscope- produces 2-D image Direct descendants of Hooks scope> take two lenses to a light source> used this to magnify images up to 1‚000 fold. 2. Confocal Microscope- uses lenses& a light source> produces a 3-D image. 3. Fluorescence Microscope- 2-D or 3-D‚ allows us to visualize fluorescent dyes. 4. Transmission Electron Microscope- it shoots a bean of electrons through a sample‚ and it collects whatever passes through
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Points Electron microscopes A.that are scanning have better resolution than those that are transmission Correct B.are much more expensive and take up more space than light microscopes C.can use the same preparations of specimens that have been prepared for viewing with a light microscope D.have a resolving power approximately 10 times better than the best light microscope Answer Key: B Question 5 of 12 2.0 Points Transmission electron microscopes have a maximum
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Louis Pasteur 4. John Tyndall B. If not Spontaneous Generation‚ then what? 1. Ferdinand Cohn 2. Robert Koch Chapter 3: Microscopy & Staining I. What can we see with a microscope? A. Micrometer B. Nanometer II. History of Microscopy A. Robert Hooke B. Anton van Leeuwenhoek III. Principles of Microscopy A. Total Magnification
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Chemistry * a science that dealing with the structure‚ composition and properties of items and with the transformations that they undergo * the composition and chemical properties of a substance * chemical processes and phenomena (as of an organism) Examples: - Digestion; enzymes promoting chemical reactions that power our bodies. Lifting your arm requires your body to make and burn ATP using oxygen with carbon dioxide as one of the waste gases produced. - The internal combustion
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AND HEARING INTRODUCTION Humans have sight and hearing limitation. Without any devices‚ our sight and hearing was limited. Most of the limitation of sight can be overcome with the help of certain optical instruments such as magnifying glass‚ microscope‚ binoculars and others. The range of frequency of hearing in human 20 Hz to 20 000 Hz. It was different according to the age of a person. Hearing limitations can be overcome by using devices such as microphone‚ stethoscope‚ earphone and PA system
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mass and takes up space. A door and a table. 40. It was evenly distributed. 42. a. Electron cloud b. Protons c. Neutrons 44. The number of protons equals the number of electrons so it’s neutral. 46. Protons and neutrons. 48. The electron 50. The Anode attracts negatively charged electrons. 52. The positively charged gold nuclei. 54. The nucleus because it has a positive charge. 56. By using the scanning tunneling
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and electrons but a different number of neutrons. RADIOACTIVE ISOTOPES the nucleus decays spontaneously giving off particles and energy. Useful for tracing cells in the body when they pick up this radioactive isotope. 5. The farther an electron is from the nucleus‚ the greater its energy. Numbers of electrons in the outermost shell determines the chemical properties of an atom. Outer shells that are not full interact with other atoms‚ however shells that are full (ie: helium with 2 electrons)‚ are
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FESEM uses a beam of electrons shot towards a sample to obtain information about it such what the surface looks like and the chemical makes up of the sample. Nanoparticles were diluted prior to analysis by mixing 100 μL of samples with 500 μL of distilled water. A drop of each diluted samples was then placed onto an aluminium stub and left to dry in an oven for 72 hours. The sample-loaded stubs were then gold-coated in a vacuum before being observed under an electron microscope (FEI NOVA nanoSEM 230
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Links: the microscope to a computerized spectrophotometer. Characterizes trace quantities of evidence Such as paint‚ fibers‚ inks ▫ Scanning Electron Microscope: 3d image formed by aiming a beam of electrons onto a specimen‚ then the electron emissions are based on an image shown on the closed TV circuit. Use for gun shot reused
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