### device | mechanism:

Regulator
* Most regulators increase resistance.
* Some regulators actually improve the geometry of the active site and make the enzyme more effective
  - are specific, bind only to one location
* are books
  - cannibals
  - control
  - officials
* enhance ability.
* have a long history of being co-opted by the industry they regulate.
* help to regulate interaction.
* is control
* lie somewhere on a continuum between conformer and homeostasis.
* maintain constant conditions, which maintain high enzyme function.
* respond by shortening seasons.
* take aspirin.
* tend to occupy habitats in which environmental conditions are variable.
* use physiologic mechanism to regulate their internal environment to the external changes
  - principles

### device | mechanism | regulator:

Aperture
* Some aperture is part of cameras
  - telescopes
* also has a direct effect on depth of field and also shutter speeds.
* describes how wide the lens opens to let in light for a given shot.
* has depth.
* includes sections.
* indicates the diameter of the main optical element, which is either a lens or a mirror.
* is diameter of the main lens or mirror
  - holes
  - openings
  - eyes
  - simply the hole in the camera that lets light in
  - software
  - the degree to which the iris or diaphragm inside the lens is opened
* is the diameter of the main mirror or lens of the scope
  - opening that lets light in the front of the scope
* means the opening used to collect the reflected energy that is used to form an image.
* refers to the diameter of the lens or mirror collecting the light.

### device | mechanism | regulator | aperture:

Larger aperture
* allow the telescope to collect more light and see fainter objects.
* make fainter objects visible and smaller details distinguishable.
* reach fainter magnitudes but have narrower fields of view.

Faucet
* Most faucets have faucet aerators attached.
* are capable of breaks.
* are located in bathrooms
  - restrooms
  - sinks
  - water fountains
  - the other major source of water leaks
* are used for drink water
  - washing dishs
  - valves
* can conduct electricity.
* includes handles

### device | mechanism | regulator | faucet:

Hydrant
* are color-coded to give important information to firefighters
  - for the protection of property during fires
* plumbing fixture

Water tap
* are network peripherals.
* plumbing fixture

### device | mechanism | regulator:

Flywheel
* Many flywheels function as beltwheels, for they can be belted to other machines.
  * A 'flywheel' heavy disk or wheel that is attached to a rotating shaft. Flywheels are used for storage of kinetic energy. The momentum of the flywheel causes it to not change its rotational speed easily. Because of this, flywheels help to keep the shaft rotating at the same speed. This helps when the torque applied to the shaft changes often. Uneven torque can change the speed of rotation. Because the flywheel resists changes in speed, it decreases the effects of uneven torque.
* act alternately as generators and as motors.
* are governors
  - heavies
* can maintain consistent power quality for sensitive electronic equipment.
* come in all shapes and sizes.
* create torque to help with the satellite's attitude control.
* have an inertia called the moment of inertia and thus resist changes in rotational speed
  - large moments of inertia to smooth out mechanical motion
* maintains momentum between foot strokes.
* serve as solar-powered generators.

Safety valve
* Many safety valves use a spring instead of a weight.
* are regulators