The plasma membrane is a barrier separating the cell from it’s surroundings. Plasma membranes are semi-permeable, meaning that they allow the passage of some substances through the membrane, while prohibiting the passage of other substances. The methods of transporting substances through the plasma membrane are either passive or active and carrier-mediated or not. Passive transport ...
Did you ever wonder how we can selectively breathe in oxygen and bring out carbon dioxide? Well, this is because the partial pressures exerted by the heterogeneous components of air, allow this essential process to occur. Respiration occurs because the air is composed of just the right amount of oxygen and carbon dioxide molecules. The ...
7/21/2009 My wife is an amateur photographer and does a lot of outdoor, on location photography sessions and portraits. Since many of these sessions end up being in the afternoon time frame, she struggles sometimes with sun spots on her subjects. In an attempt to help her out, I’ve used her light reflector to block ...
Heat transfer is an important concept in the world of physics and engineering. It is also at the same time both one of the most difficult and easiest subjects in these fields. It is one of the most difficult subjects because of the complex mathematics involved in modeling and predicting heat transfer in even the ...
Organisms evolved according to their environments and grew to be more and more complex over the course of evolution. This can be seen by comparing the complexities of the physiologies of circulatory systems and habitats of cnidarians, annelids, arthropods, amphibians, and birds. As organisms became more complex, so did their circulatory systems. In addition, the ...
Of all the tricks in a cinematographer’s toolkit, camera filters are probably one of the most commonly used. Mastery of the different filters enables filmmakers to exercise greater control over images your audience will hopefully pay money to see. This guide is an introduction to the most commonly used camera filters. Conversion Filters These filters ...
What’s the difference between cleaning air and purifying it? Way more than meets the senses. While air filtration is an effective way to remove harmful particles from the air, air purification, when combined with multiple air cleansing technologies, can protect you and your family from even more problems related to illness and respiratory ailments, ...
The purpose of this study is to see the effects of diffusion through a selectively permeable membrane when placed in a sucrose solution. This experiment is a model of how diffusion takes place. The dialysis tubing serves as the permeable membrane with which diffusion will occur. Since cells are so small in size, this experiment ...
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