A solar cell (also called photovoltaic cell or photoelectric cell) is a solid state electrical device that converts the energy of light directly into electricity by the photovoltaic effect. Assemblies of cells used to make solar modules which are used to capture energy from sunlight‚ are known as solar panels. The energy generated from these solar modules‚ referred to as solar power‚ is an example of solar energy. Photovoltaics is the field of technology and research related to the practical
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The fluid mosaic model of the cell membrane. What is the fluid mosaic model? The fluid mosaic model is a model conceived by S.J. Singer and Garth Nicolson in 1972 to describe the structural features of biological membranes. The membrane is described to be fluid because of its hydrophobic integral components such as lipids and membrane proteins that move laterally or sideways throughout the membrane. That means the membrane is not solid‚ but more like a ’fluid’. The membrane is depicted as mosaic
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Importance to Living Organisms. Osmosis is the diffusion of water through a semipermeable membrane that does not allow dissolved solids (solutes) to pass. Osmosis refers only to diffusion of water and the direction of movement is from the area of higher concentration to the area of lower concentration. This migration of water from a region of higher concentration to a region of lower concentration is spontaneous and although water molecules move in both directions‚ the net movement is from a region of
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Review Chapter 4 BB Notes Cells Under the Microscope Cells are microscopic in size. Although a light microscope allows you to see cells‚ it cannot make out the detail that an electron microscope can. The overall size of a cell is regulated by the surface-area-to-volume ratio. 4.2 The Plasma Membrane The plasma membrane of both prokaryotes and eukaryotes is a phospholipid bilayer. The phospholipid bilayer regulates the passage of molecules and ions into and out of the cell. The fluid-mosaic
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4-H has been an extraordinary experience that has fulfilled my childhood and made me the person I am today. Being a part of 4-H has impacted my life in ways no other club or activity could. As a child‚ I learned compassion‚ respect and responsibility by caring for my livestock. As an officer for many years‚ I learned public speaking skills‚ I am able to talk to my peers without being shy‚ as so many kids are‚ I learned how to stay organized and how to lead a whole group to an end goal. With the
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Made in L.A. The film Made in L.A. is a documentary that follows the lives of three Latina immigrants named Maura‚ Lupe and Maria. The documentaries shows their struggles and abuse working for the trendy retailer Forever 21‚ and also provides a deep look into their personal lives and the connection of hardship that bonds them together. The film touches on how they all came to the United States and why the women felt the need to move from home to a foreign country. All women possessed similar
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Animal cells do not have a cell wall. Instead of a cell wall‚ the plasma membrane (usually called cell membrane when discussing animal cells) is the outer boundary of animal cells. Animal tissues therefore require either external or internal support from some kind of skeleton. Frameworks of rigid cellulose fibrils thicken and strengthen the cell walls of higher plants. Plasmodesmata that connect the protoplasts of higher plant cells do not have a counterpart in the animal cell model. During telophase
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STRUCTURE AND FUNCTION IN CELLS Achievement Standard 90464 – Biology 2.8 – Describe cell structure and function TYPES OF CELLS • PROKARYOTIC CELLS = more primitive‚ unicellular‚ have no organised nucleus‚ no membrane-bound organelles‚ genetic material is 1 circular DNA molecule‚ can have tiny extra rings of DNA called plasmids‚ all have cell walls e.g. bacteria and blue-green algae • EUCARYOTIC CELLS = unicellular or multi-cellular‚ plant and animal cells‚ have a nucleus‚ have
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Genetically Modified Organisms (GMO) is one of the most important issues around the world. GMOs are special organisms in which the genetic material has been altered for faster growth‚ product quality‚ better pest and disease resistance and can grow in the worst of climates. GMOs also carry a lot of cons‚ such as unexpected side effects‚ problems with labeling of GM foods‚ ecological damage. Organic harvesting means avoiding synthetic chemicals and by growing unenhanced plants straight from the earth. The
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Bio coursework Methylene blue Yeast cells explanation of respiration hence colour change etc Low temp colour change should be visible as the yeast cells are not necessarily dead‚ just inactive. Activity increases from 20-45 c High rate around 30-40 Starts to slow down basically enzyme curve see bio 1 100 degrees will kill all cells Do a few preliminary keep working down until first blue solution appears in unit of ten Then work to find degree. If more accuracy then half
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