Instructors: see
notes section below
this slide.
Autotroph
Gets carbon from atmosphere
More
plant-like
(producer)
Heterotroph
Gets carbon from organic materials
More
animal-like
(consumer)
Bacteria on head of pin © 1999 The Centre for
Microscopy and Microanalysis
!
© ARS
Photo by Tomaž Vavpotič
Photo courtesy of NOAA
Cyanobacteria
NASA
Plant-like: stationary, uses
sunlight and CO2 for energy
and food (photosynthesis),
photoautotroph
Bacterial flagella
Dartmouth electron microscope facility
Paramecium
Wikipedia
Amoeba
Dr. Ralf Wagner
Animal-like: Pseudopodia for movement and feeding
Copyright Shannan Muskopf
Animal-like:
Moves and searches
for own food
Euglena
Copyright 1995-2005 Protist Information Server
Plant and Animal-like:
Can use flagella to search for food
or
Can produce food through photosynthesis
(mixotroph)
• All single celled and do not have a nucleus
• Bacteria can be both helpful and harmful
• Bacteria engage in chemical warfare with each other:
(Streptomycin)
Source: NASA
Stromatolites
© Jake Brumby
Stromatolites
Cyanobacteria
Dr. Ralf Wagner
A bloom of cyanobacteria
Baltic Sea east of
Sweden on Aug 2, 1999.
NASA
CO2
Respiration
Food nutrients
Dead organic
matter
Waste
Bioremediation for an oil spill
CO2
Respiration
Food nutrients
Dead organic
matter
Waste
(that give us grief)
Lyme disease, a bacterial disease transmitted by ticks
25% of world population dies
Cholera
(Vibrio cholerae)
Haemophilus influenzae (Pneumonia)
Anthrax
Notes from 11/28
Microorganisms
Anything too small to see without magnification
3 types of microorganisms
Bacteria, protists, fungi
2 major ways to get food
Autotroph, Heterotroph
Autotroph
Gets food (carbon) from the atmosphere (CO2),
more plant-like, known as producer.
Heterotroph
Gets food by ingesting other things, more
animal like, known as consumer.
Microorganism size
range from very small to large (fly’s head)
Microorganism habitat
From bottom of sea to Salt Lake and
everything in-between
Movement
Some are stationary, others move by cilia
(small hairs), flagella (longer tail) or
pseudopodia (extensions of outer membrane)
Notes from 11/28
Bacteria
Single celled, no nucleus
Good bacteria
Cyanobacteria produced our oxygen, other
bacteria break down waste, leaves and oil
Bad bacteria
Tuberculosis, cholera, the plague, anthrax
Protists
Single or multi-celled with nucleus, often live in
ponds
Good protists
Dinoflagellates and diatoms are the base of
food chain
Bad protists …..
• Both single-celled and multi-celled organisms, most have a nucleus
• Some protists produce their own food through photosynthesis,
others consume their food
• A great place to find many protists is in a local pond
• Some protists are helpful to other living things,
while other protists are disease causing.
A dinoflagellate
Dr. Ralf Wagner.
Bioluminescent dinoflagellates
Diatoms
(that are pesky)
Red tide
(Dinoflagellates)
P. Alejandro Díaz
Human blood cell infected
with Plasmodium
Giardia lamblia, a diplomonad
• Neither plant nor animal, have characteristics of both
• Consume food by absorbing nutrients from whatever they are growing on
Penicillium mold
Hyphae
Spores
Fungal production of an antibiotic
Budding yeast
CO2
Respiration
Food nutrients
Dead organic
matter
Waste
CO2
Respiration
Food nutrients
Dead organic
matter
Waste
ARS
(fungi without the fun)
The common mold Rhizopus decomposing oranges
ARS
Athletes foot
ARS
Microorganism treasure hunt:
What questions do you have about
microorganisms living around school?
1.
2.
3.
ARS
ARS