Definition of Physical Barriers. Physical barrier is the environmental and natural condition that act as a barrier in communication in sending message from sender to receiver. Organizational environment or interior workspace design problems, technological problems and noise are the parts of physical barriers.
Nitrate: Health Effects in Drinking Water. Nitrate is one of the most common groundwater contaminants in rural areas. It is regulated in drinking water primarily because excess levels can cause methemoglobinemia, or blue baby disease.
The most common symptom of nitrate poisoning is a blue coloration of the skin around the eyes and the mouth. Difficulty breathing and respiratory distress may occur. Additional symptoms include headache and fatigue. The medication methylene blue is administered to reverse the condition.