To Dan and Others.... There are some great PBS programs on de-salinization plants, especially in the Middle East. Have studied their processes a bit and to get fresh water, they use the same simple principles you are trying to teach when it comes to issues like hyper-, iso- and hypotonic situations and certainly what you see during your plasmolysis lab. It is 100% essential for supporting big populations in some of these countries.
Wanted to make one other comment. We use the terms FRESH and SALT WATER quite loosely. In reality, the only difference is the concentration of certain salts in water. One interesting area for Students are Fish that can live in both Fresh and Salt Water. Some spend most of their lives in Salt Water, only going to Fresh Water to spawn. Some Salmon sp. are a good example. Here in Michigan, we have fairly new Fish added by our DNR. By new it has only been for several decades. Now, the Genetics here is that are nothing more than Rainbow Trout that got a chance to spend a good deal of their lives in Salt Water. We call them Steelhead here. If you go to Lake Coeur d'alene in Idaho, they have gigantic Rainbow Trout. Catching one is not simple. This is one deep Freshwater Lake and believe the U.S. Gov't has used it for submarine testing? Should you ever to to Idaho, this is a must see part of Idaho and right on the Idaho/Washington State border. Their is another group which does the exact opposite. So, some incredible Physiological mechanisms going on here. Apologies for any cross-postings here. Thank you. Mike Nolan Thank you Perry, right on target with this response. For kids have used other ideas that they really can relate to? Why does one wake up so thirsty after downing a couple of sodium laden whoppers at midnight OR why do people lost at sea die of dehydration, when there is obviously plenty of water to drink. Now waking up thirsty after consuming alcohol is an entirely different deal. Alcohol inhibits the production/release of ADH/anti-diurectic hormone or maybe even better know as Vasopressin by our pituitary gland. In the end more water is NOT reabsorbed by nephrons in our kidneys, we urinate more and unless you match alcohol with water, you certainly could/will wake up with a very dry mouth after a night on the town. Wow, the Endocrine System, is there anything more interesting to study in Biology? Thank you. Mike Nolan The solutions are hypotonic/isotonic/hypertonic. The process would probably be salinating or desalinating. Perry "A teacher that can be replaced by a machine should be" - Arthur C. Clarke On Jun 8, 2012, at 11:52 AM, MAINVILLE, DAN wrote: The process of adding salt water to a wet mount for plasmolysis. The questions always ask for a description of the process but does the process actually have a name? ---------- If we are on another line or away from the phone, please leave your number, best time to return your call and/or your e-mail address. After hours and weekend phone appointments are available upon request. Sincerely, J. Michael Nolan, Director Rainforest and Reef 501 (c)(3) non-profit ************************************************************************************************** “Outstanding-Affordable Field Courses in Rainforest & Marine Ecology” “Spanish/Cultural Immersion Programs: Spain, Mexico, Central and South America” Rainforest and Reef 501 (c)(3) non-profit 161 Main St. Coopersville, MI 49404 Local/International Phone: 1.616.604.0546 Toll Free U.S. and Canada: 1.877.255.3721 Fax: 1.616.604.0546 Google Talk/MS IM/Skype: travelwithrandr AOL IM: buddythemacaw E-mail: [email protected] and [email protected] Note: Please send inquiries to both e-mail addresses Web: http://rainforestandreef.org (under revision for 2012) **************************************************************************************************
