### action | interaction:

Complex interaction
* affects exposure.
* exist among anticonvulsants.
* involves feedback.
* occur when humans introduce new plant or animal species into a region.

Different interaction
* affect different particles.
* happen in different populations.

### action | interaction:

Drug interaction
* Many drug interactions are due to alterations in drug metabolism.
* Some drug interactions occur quickly while others take days or even weeks to develop.
* are a major health problem
  - complex
  - graded phenomena
  - harmful or fatal if recreational drug levels reach toxic concentrations
  - limited, and side effects are similar to aspirin or dipyridamole
* can also be synergistic
  - lead to emotional problems
* can be inhibitory, where one drug actually inhibits the actions of anther drug
  - lethal
  - cause serious side effects or dangerous overdoses
  - increase harmful side effects
* can occur by different mechanisms in the same patient
  - with many types of substances
  - take various forms, occurring immediately or over several weeks
* have to do with the effect of a drug being altered by something else.
* occur by a variety of mechanisms.

Ecological interaction
* drive evolutionary loss of traits.
* influences intensity.

Electrostatic interaction
* are important in determining the structure and function of biomolecules.
* initiate the formation of such a complex.
* occur between charged atoms.
* play a significant role in many biological processes.

Epistatic interaction
* can lower the cost of resistance to multiple consumers.
* come in four types, thus there are possible interactions.

### action | interaction:

Human interaction
* All human interaction involves exchanging data of some kind
  - interactions are opportunities either to learn or to teach
* Most human interaction involves non-verbal, visual and sense perception clues.
* begins with the ability to communicate by speech.
* can also be a part of the search and decision making process.
* help one to cope with change, and accept life as it is.
* helps foster partnerships.
* is an important element of electronic government, especially in education
  - part of learning
  - enriched by the redundancy of multimodal communication
  - part of the richness of being people
* is the foundation through which communities work
  - sustenance of group work
* make up all parts of the world.
* occurs because of presence and difference.

Hydrophobic interaction
* allow for interactions like oil and water.
* are another source of stability for the alpha-helical shape
  - the major driving force for the formation of lipid bilayers
* attract water molecules.
* control zymogen activation in the trypsin family of serine proteases.
* hold together the plasma membrane.
* occur between the anion and cation of a salt.

Inductive interaction
* Most inductive interactions occur during oogenesis.
* direct early regionalization of the mouse forebrain.

Interspecific interaction
* are basically interactions between species.
* can occur at both the juvenile and adult stages.
* drive cultural co-evolution and acoustic convergence in syntopic.

Noncovalent interaction
* are individually weak but collectively strong.
* involve electrical charges.

Personal interaction
* can be an important source of stress.
* is the primary conduit for the transfer of technology.

Protein interaction
* underlie most virus disease processes.
* unifying theme of all cellular regulation.

Similar interaction
* cause the northern lights on Earth.
+ Saturn, Moons
  * Enceladus, the sixth largest moon, is about  in diameter. It is one of the few outer solar system objects that shows volcanic activity. In 2011, scientists discovered an electric link between Saturn and Enceladus. This is caused by ionised particles from volcanos on the small moon interacting with Saturn's magnetic fields. Similar interactions cause the northern lights on Earth.