Figure 1. Types of movement across membranes. Molecules can diffuse across a. membrane down a concentration gradient without the aid of a protein or the input of. energy. Passive and active transport require membrane transport proteins. Channel. proteins carry out passive transport, but carrier proteins can carry out passive or active. transport.
Akron, Iowa. Akron is a city in Plymouth County, Iowa, United States. The population was 1,486 at the 2010 census.
Akron-area historical tornado activity is near Iowa state average. It is 89% greater than the overall U.S. average. On 7/28/1986, a category F4 (max. wind speeds 207-260 mph) tornado 23.3 miles away from the Akron city center injured 2 people and caused between $50,000,000 and $500,000,000 in damages.