In this Issue

- Apparent Temperature
  Experiment
- HS-100 Humidity Sensor
  Tech Note
- TM-100 Temperature
  Sensor 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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March 2007

 Application:  Temperature, Relative Humidity, and
 Apparent  Temperature

The moisture content of the atmosphere can significantly affect biological processes taking place in some organisms by altering the thermoregulation needed to maintain the optimal temperature range for reactions taking place in cells.  During dynamic exercise, the majority of energy consumed is transformed to heat.  This additional heat can produce stress on the body unless the heat is exchanged between the body and environment. The primary way by which heat is dissipated from the body is sweating, which is known more scientifically as evaporative cooling.  

If the moisture content of the atmosphere is high, then the amount of evaporative cooling that can place on the skin is reduced, the amount of heat dissipated by the body is reduced, and the core temperature of the body increases.  The moisture content of the atmosphere is commonly expressed as relative humidity (RH).  Relative humidity and the dry air temperature combine to create the apparent temperature sensed by the body. The apparent temperature is also known as the heat index, the humiture, or the humidex.

This article includes the necessary directions to incorporate the HS-100 Humidity Sensor into an existing lab exercise in which the relative humidity is a variable that affects the results of the experiment.  Some of the measurements that can be influenced by relative humidity include: the effects of exercise on core temperatures of endoderms; the effect of apparent temperature on the behavior of ectoderms; and the effect of apparent temperature on water movement (transpiration) in plants.

Download locked apparent temperature experiment.
 

Download screen optimized or press optimized apparent temperature experiment.

HS-100 Humidity Sensor

The HS-100 is a sensor designed to measure the relative humidity (RH) in environmental chambers, plant growth chambers, model ecosystems, or the atmosphere. The HS-100 can provide measurements of relative humidity from 0 to 100%, over a temperature range from –30^oC to 60^oC.  This sensor is fast responding, unaffected by immersion in water, and easily cleaned with deionized water.  The HS-100 can operate in many types of atmospheres that contain: salts from ocean spray; pollutants from combustion, like sulfur dioxide, hydrogen sulfide, ozone, nitric oxide, carbon monoxide, and carbon dioxide; chemicals from manufacturing, like soap, softener, sulfuric acid, hydrochloric acid, nitric acid, toluene, smoke, and insecticides; and more.

View a Tech Note here.

HS-100 Humidity Sensor

TM-100 Temperature Sensor

The TM-100 is a sensor that can monitor temperatures between 15 ^oC above and 15 ^oC below room temperature.  The TM-100 is capable of responding to changes in temperature within a few seconds because of its small size (1mm x 3mm) and mass.  The TM-100 is suitable for monitoring nasal airflow, changes in skin temperature that indicate evaporative cooling, and changes in atmospheric temperature and temperature in environmental chambers.  Since the sensor element is water-resistant, the tip of the TM-100 can be immersed in aqueous solutions, including saline solutions, for a few hours.

View a Tech Note here.

TM-100 Temperature Sensor

HS-100

Humidity Sensor

$125

$100

TM-100

Temperature Sensor

$115

$92

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 evaporative cooling, hyperthermia, transpiration, and the heat index  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 subcategories for easy reference.

iWorx is dedicated to the ongoing development of new products to provide you with more lab options for your physiology teaching curricula.  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