### substance:

Substance p
* decreases fluid absorption in the renal proximal tubule.
* inhibits pancreatic exocrine secretion via a neural mechanism.

### substance:

Substrate
* Most substrate contains matter.
* Some substrate has conductivity
  - low conductivity
  - retains humidity
* Some substrates are acetaminophen, amitriptyline and propranolol
  - provide oxygen to the eggs, while others take it away
* are important because they establish an environment for fish eggs.
* bind to the surface of the enzyme called an active site.
* cans have effects
  - significant effects
* consists of fine particles
* contain an aromatic ring with a pyruvate side chain.
* contains components
* helps humidity.
* plays a very important role it helps create humidity.
* refer to different feeding and swimming environments.
* requires for growth
  - microbial growth

Such material
* have conductivity
  - high conductivity
  - properties
* possess properties.

### substance:

Synthetic material
* Most synthetic materials have properties.
* Some synthetic materials can withstand high temperatures or are resistant to chemical reaction
  - tend to be unstable and deteriorate quickly
* are resistant in general.
* can never have the same patina, texture, or light-reflective qualities.
* contain contaminates from the reaction process.
* have no counterpart in nature
* hold moisture, which encourages bacteria to grow.
* offer some cushioning when they stop a fall, reducing the chance for an injury.

Thickener
* also play an important part in the water balance of the plant.
* are adjuvants that increase the viscosity of solutions.

Toner
* are even exfoliating products and work by removing dirt and cells via a cotton ball or pad.
* depend on the tiny polymer beads that they transfer to paper to form images.
* is located in copiers
  - lotion
  - solutions

Toxic material
* Some toxic materials move through the soil untreated or unchanged.
* are harmful to both the natural environment and to humans.
* can enter the body by many routes
  - through cuts or sores
* vary in the way they affect plants.

### substance:

Toxic substance
* Many toxic substances cause SVTs, usually sinus tachycardia
  - ventricular tachycardia
  - have medical utility
* Most toxic substances have effects.
* Some toxic substances accumulate in blood
  - tissue
  - are dangerous even in very small amounts
* Some toxic substances are produced by fungi
  - various fungi
  - released by bacteria
  - bind to sediment and are transported to coastal waters through sedimentation
  - can enter a food web and be transferred through it
* Some toxic substances cause cancer, genetic mutations and fetal harm
  - diarrhea
  - diseases
* Some toxic substances kill animals
  - other animals
  - prey
  - produce effects
* are chemicals which cause human and wildlife health problems
  - produced by normal metabolic activities
* can affect human health or various plant or animal species
  - alter the normal activity of the nervous system
* can cause cancer, birth defects, and other illnesses
  - illness and even death if swallowed or absorbed through the skin
  - leach from disposal sites and affect areas far removed from the source
  - leak from landfill sites and pollute underground water supplies
* enter the basin through both point and nonpoint sources
  - nation's water system via a number of pathways
* tend to produce symptoms in two time frames.

Toxicant
* Many toxicants enter the environment in industrial effluents or through insecticides and herbicides.
* applied below ground include zinc phosphide and strychnine.
* are generally the easiest way to get rid of gophers
  - perhaps the best way to control voles
* can cycle back and fourth among the water, sediment, and tissues of living organisms
  - only be effective if placed in active burrows
* containing zinc phosphide are highly poisonous to all wildlife.