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Results for: 'preoptic region'
Metabolic Rate, Heat and Thermoregulation - response to heat and cold stresses
By: HWC, Views: 6856
• A neuron group in the anterior portion of the hypothalamus controls heat balance. • Neurons in the preoptic region of the hypothalamus integrate signals that come from thermoreceptors. • The temperature control center in the preoptic region propagates control signals to two other part...
By: HWC, Views: 6315
The trp operon in E. coli contains five structural genes corresponding to enzymes that convert chorismate into tryptophan. The trpE gene contains a 5' untranslated region that plays an important role in the regulatory mechanism called attenuation. The 5' UTR contains four regions. Region 1 en...
Blood Flow Through the Kidneys
By: Administrator, Views: 9503
Purplish-brown, bean-shaped organs located behind abdominal cavity (retroperitoneal area) on either side of spine, between thoracic vertebrae and lumbar region.
By: HWC, Views: 4390
Osmosis is when a solvent, such as water, moves from a low-solute concentration solution to a higher-solute concentration solution through a semipermeable. Osmosis is an example of diffusion (a special case of diffusion) in which the molecules are water, and the concentration gradient occurs a...
By: HWC, Views: 3936
Osmosis is when a solvent, such as water, moves from a low-solute concentration solution to a higher-solute concentration solution through a semipermeable. Osmosis is an example of diffusion (a special case of diffusion) in which the molecules are water, and the concentration gradient occurs a...
Polymerase chain reaction PCR - Animation
By: HWC, Views: 473
Polymerase chain reaction (PCR) is a method that amplifies fragments of DNA. The purpose of PCR is to create copies of a specific region of DNA. To use this technique, researchers must know the base sequences at either end of the region of interest. They use this information to create...
Electromagnetic Spectrum, Chlorophyll and Pigment & Light
By: HWC, Views: 6358
The sun gives off radiation that is called the electromagnetic spectrum. This is energy that travels as wavelengths and includes radio waves, X-rays and ultraviolet light. A portion of this radiation is known as visible light, and is the type of radiation that plants use to manufacture sugars. ...
Interspecific Competition Relationship - Competitive & Niche Differentiation
By: HWC, Views: 6306
In an environment with limited resources, any organisms that utilize the same resources will be in competition with each other. For example, let's look at two competing species of paramecium, a single-celled organism that feeds on bacteria. If we raise each of these species in isolation, both...
Four Giant Convection Cells oF Earth
By: HWC, Views: 5954
Earth Has Four Giant Convection Cells Earth's climates range from dry and cold at the poles to wet and warm at the equator. These climates are dictated largely by the amount of solar radiation that a region receives. Solar radiation warms the Earth and the surrounding air, setting up convection c...
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