Examples of unit cell in the following topics:
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- The most common way to describe a crystal structure is to refer to the size and shape of the material's characteristic unit cell, which is the simplest repeating unit within the crystal.
- In principle, one can reconstruct the structure of an entire crystal by repeating the unit cell so as to create a three-dimensional lattice.
- These spheres are packed into unit cells.
- By considering how atomic spheres are arranged relative to one another, their coordination numbers, and the dimensions of the unit cell, it is possible to form a general view of the structure and complexity of particular crystal structures.
- Notice that this unit cell contains several atoms.
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- Closest packing refers to the most efficient way to arrange atoms in a crystalline unit cells.
- A crystalline material's structure is typically visualized as being composed of unit cells.
- In a three dimensional representation of this hypothetical unit cell—with the spheres packed as efficiently as possible—there are two methods to densely pack the cell.
- Imagine a single layer of spheres packed into the bottom of a unit cell.
- A CCP arrangement has a total of 4 spheres per unit cell and an HCP arrangement has 8 spheres per unit cell.
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- Cell theory states: living things are composed of one or more cells; the cell is the basic unit of life; cells arise from existing cells.
- The unified cell theory states that: all living things are composed of one or more cells; the cell is the basic unit of life; and new cells arise from existing cells.
- "All cells only arise from pre-existing cells.
- The cell is the fundamental unit of structure and function in living things.
- The cell is the basic unit of life and the study of the cell led to the development of the cell theory.
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- A cell is the smallest unit of a living thing and is the basic building block of all organisms.
- A cell is the smallest unit of a living thing.
- A living thing, whether made of one cell (like bacteria) or many cells (like a human), is called an organism.
- For example, both animal and plant cells are classified as eukaryotic cells, whereas bacterial cells are classified as prokaryotic.
- Bone cells help to support and protect the body.
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- A cell is the basic unit of life and the smallest unit capable of reproduction.
- While cells vary greatly in their structure and function based on the type of organism, all cells have a few things in common.
- Cells may be prokaryotic (without a nucleus) in bacteria and archaea (single-celled organisms), or eukaryotic (with nucleus-enclosing DNA) in plants, animals, protists, and fungi.
- In humans, most cells combine to form tissues, but some cells are found independent of solid tissues and have their own functions.
- A red blood cell found circulating in the bloodstream carrying oxygen throughout the human body is an example of an independent cell.
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- 70%–85% of the energy obtained from the fuel in a fuel cell can be converted into power and heat compared to coal or oil, which is around 35%.
- Fuel cells are inherently reliable, rugged, quiet and versatile and they can be used to power almost anything from a hearing aid to an office building.
- Currently, fuel cells are being developed to power cars (every major automotive manufacturer in the world now has a fuel cell vehicle in development), buses, boats, trains, planes, consumer electronics, portable power units and wastewater treatment plants (where the methane produced by the wastewater is used as a fuel source).
- Since fuel cells are smaller than coal-fired furnaces, less land is required to set them up as compared to traditional power plants.
- The pure water emitted as a waste product from a fuel cell can always be put to good use.
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- Antibiotics commonly target bacterial cell wall formation (of which peptidoglycan is an important component) because animal cells do not have cell walls.
- They bind to the amino acids within the cell wall preventing the addition of new units to the peptidoglycan .
- Diagram depicting the failure of bacterial cell division in the presence of a cell wall synthesis inhibitor (e.g. penicillin, vancomycin).1- Penicillin (or other cell wall synthesis inhibitor) is added to the growth medium with a dividing bacterium.2- The cell begins to grow, but is unable to synthesize new cell wall to accommodate the expanding cell.3- As cellular growth continues, cytoplasm covered by plasma membrane begins to squeeze out through the gap(s) in the cell wall.4- Cell wall integrity is further violated.
- The cell continues to increase in size, but is unable to "pinch off" the extra cytoplasmic material into two daughter cells because the formation of a division furrow depends on the ability to synthesize new cell wall.5- The cell wall is shed entirely, forming a spheroplast, which is extremely vulnerable relative to the original cell.
- Finally, the fact that the cell has now doubled much of its genetic and metabolic material further disrupts homeostasis, which usually leads to the cell's death.
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- Animal cells each have a centrosome and lysosomes, whereas plant cells do not.
- The cell wall is a rigid covering that protects the cell, provides structural support, and gives shape to the cell.
- Fungal and protistan cells also have cell walls.
- While the chief component of prokaryotic cell walls is peptidoglycan, the major organic molecule in the plant cell wall is cellulose , a polysaccharide comprised of glucose units.
- The dashed lines at each end of the figure indicate a series of many more glucose units.
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- The cell wall acts as an extra layer of protection, helps the cell maintain its shape, and prevents dehydration.
- Fimbriae are used by bacteria to attach to a host cell.
- At 0.1 to 5.0 μm in diameter, prokaryotic cells are significantly smaller than eukaryotic cells, which have diameters ranging from 10 to 100 μm .
- These adaptations led to the development of more sophisticated cells called eukaryotic cells.
- This figure shows relative sizes of microbes on a logarithmic scale (recall that each unit of increase in a logarithmic scale represents a 10-fold increase in the quantity being measured).
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- Cardiac muscle appears striated due to the presence of sarcomeres, the highly-organized basic functional unit of muscle tissue.
- A sarcomere is the basic unit of muscle tissue in both cardiac and skeletal muscle.
- Intercalated discs consist of three types of cell-cell junctions, most of which are found in other tissues besides cardiac muscle:
- Desmosomes, which bind adhesion proteins to the cytoskeleton within cells, thus connecting the cells.
- A single sarcomere unit with all functional areas labeled, including thick and thin filaments, Z lines, H zone, I bands, and A band.