Odor
* Many odor reducing additives are under development.
* Most odor affects flavor
  - odors consist of mixtures of odorant molecules
* Sets the operating standards for non-agricultural uses which emit odors.
* Some odor affects activities.
* Some odor attracts beetles
  - bury beetles
  - disperse beetles
  - predators
* Some odor is caused by digestion
  - secretion
  - odors can inhibit the cell
* also leave a lasting scent-sation.
* are detected through some fifty million olfactory receptor cells
  - difficult to measure
  - hard to explain away and are always noticed
  - manure products
  - molecules of chemicals from almost anything
  - often the first indication that harsh chemicals are present
* are the only communication signals that are effective around corners
  - spice of life
* attract bears, so avoid carrying or cooking odorous foods
* can come from bacteria beneath the gum line
  - develop when the windrow is too large
  - have powerful influences
  - result from anaerobic conditions if too much moisture accumulates in the unit
* carry better on moist air, and breath adds moisture.
* come from the gas molecules
  - release of organic compounds during the fermentative decomposition of manure
* coming from the stomach are almost never the cause of chronic bad breath.
* compounds from any particular item are absorbed onto a thin, polymer film.
* conjure up memories and stir emotions.
* continue until the body eliminates the food.
* elicit three different oscillations in the turtle olfactory bulb.
* emanate from plant and leave a trail to the plant.
* emitted by the rest of the body are of minor importance.
* evoke complex and highly individual reactions.
* have an amazing effect on our moods, because they hook into the primitive parts of our brains
  - both attractant and repellent qualities
* influence the selection of food as much as the selection of a mate.
* initially interact with receptor neurons in the olfactory epithelium.
* is located in air
  - dirty laundries
  - sensory information
* left by the colony can linger for a long time and attract other swarming bees
  - killed colony can linger for a long time and attract other swarming bees
* naturally occur in sewage collection systems.
* play an important role in agouti communication.
* produced by skin microflora also play a part in inducing the mosquito to land.
* reach into all our emotional lives, drawing from the deepest caves in our minds.
* seem more various than pheromones.
* signatures and kin recognition.
* significantly improve the retrievability of labels and words.
* tend to be stronger in high humidity and heat.
* thresholds in passerines.
* trigger the release to the brain certain chemicals known as neurochemicals.
* waft up the nasal cavity to a patch of nerve cells above the eyes.

### odor:

Body odor
* Most body odor is the result of bacterial breakdown of sweat.
* comes from the apocrine glands which secrete nutrients upon which bacteria feed.
* common problem, particularly in the summer months.
* develops in the absence of bathing.
* increases as the composition of sweat changes.
* is an unpleasant or bad smell from the body
  - caused by bacteria that live in the sweat on the skin
  - what happens when sweat and other skin secretions are acted apon by occurring bacteria
* occurs in the axilla due to microorganisms.
+ Axilla, Body odor: Body parts

Foul odor
* are a sign that there is too much water and anaerobic conditions exist.
* prevent some homeowners from enjoying their yards and decks in warm weather.

Human odor
* gas that is carried through the air.
* red flag to their sense of smell.

Pleasant odor
* are good omens, unpleasant ones predict anxieties.
* have positive hedonic tones, and negative hedonic tones indicate unpleasant odors.

Strong odor
* Many strong odors are produced by sulfur compounds.
* are the result of anaerobic conditions or ammonia formation.
* can start a headache, too.