Chemicals Flashcards
Define LD50
a dosage that will kill 50% of the test population
What does LD50 stand for?
Lethal dose 50
How is LD50 measured
mg of toxin/ kg of organism
what food should babies under a year not eat?
honey
Vitamin which can combat cyanide poisoning
B12
Ricin: __ ribosomes deactivating per min
1500
Ricin possible benefit
Cancer combatting
What are the different ways of entering the body the toxins can take that alter LD50
Absorption, ingestion, inhalation, injection
toxic mushroom examples:
death cap, destroying angel
mg in a kg
1 million
define environmental steward
Conservation, preservation, reduce reuse recycle, respecting wildlife, educating others, limiting pollution/carbon footprint
of plant/animal extinction linked to human activity
nearly 1000 species
Support services
create and replenish the foundation of the earth’s biological system
(creating 02, replenishing soil)
Provisioning services
giving us the raw materials we need to live
E.g. oceans and rivers provide food and water
Regulating services
moderating the earth systems we need, which can be dangerous if not regulated
E.g. fungi decomposing things, plants filtering water
Cultural services
how ecosystems provide us with beautiful places to live and play in
E.g. Parks, beaches
What needs to be intact for ecosystems to function properly?
biodiversity
Why is biodiversity good?
It makes species resilient to changes, making there be a better chance of survival if humans mess up and kill off a species or two.