In this Issue

- Biological Buffers
- ISE-100 pH Electrode
  Tech Note
- Web Resources
- New Products from iWorx
- Clearance Items

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The iWorx newsletter is a FREE monthly publication dedicated to sharing teaching laboratory techniques and other useful information with educators in the fields of Anatomy and Physiology. We will also be sending you technical information and info on new developments at iWorx that we feel may be of use to you in your teaching and research activities.

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iWorx has everything you need to add excitement and distance learning to any physiology teaching program. Our products include data acquisition hardware, professionally -developed physiology courseware, innovative web tools, and a full selection of transducers, cables, front ends and accessories.

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January 2007

 Experiment:  Biological Buffers

To survive in changing environments, organisms must be able to maintain steady internal environments in which cellular metabolism can take place.  One of the factors that must be maintained at a steady range is the pH of the fluids in which biochemical reactions take place. If the pH level is not within a proper range, the chemical reactions necessary for life will cease and the organism will die.  One of the ways used to maintain the pH of the internal environment is the use of naturally occurring buffers, which are formed from mixtures of chemicals in and around cells. These buffers maintain pH levels within a narrow range, despite large changes in the amount of acids or bases introduced into the internal environment. Carbonic acid and bicarbonate in the blood are good examples of a pair of chemicals that work as a buffer. 

In this experiment, students will determine the buffering capabilities of a variety of solutions by measuring the pH of the solutions when they are treated with either a weak acid or a weak base. Each group of students will measure the pH changes that occur in deionized (DI) water, a buffered physiological saline, and another solution from a list provided.

Download Biological Buffers experiment.

Download screen optimized or press optimized Biological Buffers experiment.

ISE-100 pH Electrode

The ISE-100 is an easy-to-use pH electrode that is capable of measuring the acidity of solutions over a pH range of 0 to 12.  The ISE-100 is a combination electrode with both the recording and reference electrodes included in the same housing.  The plastic housing at the end of the electrode protects the glass membrane and reduces the probability of the electrode breaking as it is handled. 

View a Tech Note here.

ISE-100 pH Electrode

ISE-100

pH Electrode

$155

$125

Download the updated settings group for this month’s experiment and the other experiments published in the iWorx Newsletter.

Whether you plan to download any of the experiments announced in recent editions of the iWorx Newsletter or a new copy of the LabScribe Installation CD, you need a password and an ID to access the download sites for these items. 

To register for a new ID and password, please go here.   After you receive confirmation that user account has been activated, return to the same site and click on the Enter link. 

Registered users can log-in here.

To download screen or press optimized copies of the latest lab experiments and Tech Notes published in the iWorx Newsletters, go here and select the lab experiment of interest.

If you plan to use any of the experiments or manuals announced in recent editions of the iWorx Newsletter, you should obtain a copy of the settings group used to configure LabScribe for these experiments.  To download the settings file, right click here and choose "Save Target As" in the Internet Explorer browser or "Save Link As" in the Firefox browser.  Save the file in your LabScribe Folder.  When you launch LabScribe, the settings group will be available from Load Group command in the Settings menu.

The write-ups and the settings files for the blood pressure experiments in the iWorx Physiology Manual have been updated.  The latest version of the LabScribe Installer CD that contains the updates, is available for free on the iWorx Users Area.

Learn more about water quality by going to the external Web resources page.

On this page we have also accumulated a host of links to informative, external physiology Web sites and conveniently categorized them into major sub categories for easy reference.

iWorx is dedicated to the ongoing development of new products to provide you with more lab options for your physiology teaching curicula.  Click on the links below to see the most recent product introductions:

Clearance Items

iWorx has a large supply of new and trade-in items at up to 70% discount.  Also check with us about trade in allowances for your older Powerlab or Biopac equipment.  Customers in the U.S. and Canada can order directly online. See specials