1. The advantages of using an electron microscope is that it has a greater magnification‚ so you can see more detail about the organism. It would be preferable to use a light microscope when you want to see the cell in the act of moving or dividing. 2. Prokaryotic cells don’t have organelles like eukaryotic cells do. Eukaryotic cells contain its DNA within its nucleus‚ while prokaryotic cells keep it within the nucleoid. Prokaryotic cells are also more minute than the eukaryotic cells. Also although
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ABSTRACT Television has been an excellent medium for entertainment and information ever since the invention of the electron scanning tube in 1923 by Vladimir Kosma Zworykin‚ who is considered the father of the modern television. With the conversion to digital format 1080i in 1998‚ there has been a boom in the production of different types and technologies for Televisions. A new generation of televisions has been developed‚ including liquid crystal display (LCD)‚ rear projection‚ and high definition
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1.CANCER Cancer /ˈkænsər/‚ known medically as a malignant neoplasm‚ is a broad group of diseases involving unregulated cell growth. In cancer‚ cellsdivide and grow uncontrollably‚ forming malignant tumors‚ and invading nearby parts of the body. The cancer may also spread to more distant parts of the body through the lymphatic system or bloodstream. Not all tumors are cancerous; benign tumors do not invade neighboring tissues and do not spread throughout
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Microbiology is the study of microorganisms which must be viewed with the aid of a microscope or electron microscope. The importance of microbiology includes: used in biomedical research‚ creation of medicines‚ environmental applications and new research tools. Disease causing organisms include: protists‚ bacteria‚ viruses and other microorganisms. Bacteria are important for fixing N2 in a usable form for plants. Bacteria and some fungi are important in decomposition and recycling
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new cells. MICROSCOPES: There are two main types of microscopes: Light and Electron Electron Micrographs- shown in colour LIGHT ELECTRON Uses beam of light Magnification = x1500 Resolution = 200 nm Wide range of specimens can be used Samples are fairly quick + easy to prepare Cheaper and safer Limited resolution Limited magnification Transmission Electron Microscope (TEM) Scanning Electron Microscope (SEM) Uses electromagnets to focus beam of electrons Denser parts
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shear mixing technology to create novel colloids. The dispersed-phase particles have a diameter of between approximately 5 and 200 nanometers.[2] Such particles are normally invisible in an optical microscope‚ though their presence can be confirmed with the use of an ultramicroscope or an electron microscope. Homogeneous mixtures with a dispersed phase in this size range may be called colloidal aerosols‚ colloidal emulsions‚ colloidal foams‚ colloidal dispersions‚ or hydrosols. The dispersed-phase particles
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mass of the atom is concentrated) having a positive charge‚ surrounded by moving electrons carrying negative charge. Geiger and Marsden carried out an experiment to verify his proposal. The Geiger/Marsden a Particle Scattering Experiment 1. The apparatus is illustrated in the diagram below. | 2. The apparatus was in an evacuated container. The detector was a ZnS screen observed through a low power microscope. Each time an alpha particle hit the screen‚ a small flash of light was produced
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xray------------------------------------------------- X-ray X-radiation (composed of X-rays) is a form of electromagnetic radiation. X-rays have a wavelength in the range of 0.01 to 10 nanometers‚ corresponding to frequencies in the range 30 petahertz to 30 exahertz (3×1016 Hz to 3×1019 Hz) and energies in the range 100 eV to 100 keV. The wavelengths are shorter than those of UV rays and longer than those of gamma rays. In many languages‚ X-radiation is called Röntgen radiation‚ after Wilhelm
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THEORY- a. All living things are composed of cells b. Cells are the basic units of structure and function of living things c. All cells are produced from other cells 4. Microscopes focus light through lenses to produce a magnified image and other microscope use beams of electrons 5. Parts of cells work together- each kind of cell structures has a different functions within a cell 6. In multi- cellular organisms cells are organized into tissues organ system 7.
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Questions on Units 1.1 – 1.4 on Cell Components 1 The figure below shows an electron micrograph of an animal cell. A B centriole C nucleus (a) Name and state the function of the following structures. (i) Structure A …………………………………………………………………………………………… …………………………………………………………………………………………… (ii) Structure B …………………………………………………………………………………………… …………………………………………………………………………………………… (iii) Structure C …………………………………………………………………………………………… …………………………………………………………………………………………… (6 marks)
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