microorganisms

Nature | Crash: A Tale of Two Species - Horseshoe Crabs and Humans

Icon: 
Streaming icon

Learn about horseshoe crabs in this video from Nature. Horseshoe crabs spend most of their time, and are safest, on the ocean floor, but when it is time to spawn, they take a risk by coming to the surface to lay eggs. With the current moratorium imposed on fisherman using crabs as bait, they now harvest crabs for medical purposes and are then required to return them alive to Chesapeake Bay. Horseshoe crabs have blue blood containing a coagulant that detects minute levels of bacteria, forming a protective shield within the body akin to a "primitive antibiotic."

Hidden Biodiversity Vol. 1 (2015)

Icon: 
DVD icon
Icon: 
Teacher's Guide icon

A close examination of the life within a pond or lake reveals adaptive structures and behaviors that promote survival of many species. Yet, their life cycles and body structures tell us much about the natural world and the delicate balance within it.

Grade Level: 
High
Length: 
00:27
Hidden Biodiversity Vol. 1

The Biology of Protists (2003)

Icon: 
Streaming icon
Icon: 
Teacher's Guide icon

The term "protist" covers a wide range of microscopic organisms formerly clumped into "Kingdom Protista." New molecular analyses show that the protistan lines of evolution go so far back in time they can be considered as different kingdoms of life.

Grade Level: 
Middle
High
Length: 
00:20
The Biology of Protists

Cell Movement and Transport (2001)

Icon: 
Streaming icon

Topics: Structure and Behavior of the Plasma Membrane, Osmosis, Transport Proteins, Phagocytosis, Pinocytosis, Receptor Mediated Endocytosis, Golgi Function, Lysosomes and Hydrolytic Digestion, Microtubules, Cilia, Actin, and Myosin Motor Proteins.

Grade Level: 
High
Length: 
00:15
Cell Movement and Transport

Forest Floor Expedition (2004)

Icon: 
Streaming icon
Icon: 
Teacher's Guide icon

• The Living Humous – studies the living component of soil, where dead organic material is broken down through the efforts of decomposer bacteria, sow bugs, millipedes, centipedes, and fungi.
• The Rotting Log – looks at how dead wood returns to the soil with the help of termites and the symbiotic microorganisms living in the termite gut.

Grade Level: 
Middle
Length: 
00:08
Forest Floor Expedition

The Biology of Algae (2004)

Icon: 
Streaming icon
Icon: 
Teacher's Guide icon

The term algae is a catchall for several evolutionary lines of photosynthetic organisms: dinoflagellates: red algae (plastids with chlorophyll A); diatoms, yellow-brown algae and brown algae (chlorophylls A and C); and green algae (chlorophylls A and B). This program explores the diversity, structure, ecological roles and modern classification of these vital primary producers.

Grade Level: 
Middle
High
Length: 
00:20
The Biology of Algae

The Biology of Bacteria (2004)

Icon: 
Streaming icon
Icon: 
Teacher's Guide icon

The bacteria section uses compelling microscopy of living bacteria to examine their structure, physiology, behavior, and the vital roles these microbes play in the biosphere, including oxygen production (cyanobacteria), decomposition, nitrogen fixation, and as parasites as well as helpful symbionts.

Grade Level: 
Middle
High
Length: 
00:17
The Biology of Bacteria

The Evolutionary Arms Race & Why Sex? (2001)

Icon: 
DVD icon

The Evolutionary Arms Race - 60 minutes

Survival of the fittest: Is it raw competition, a level of cooperation indispensable to life, or both? Explore our own spiraling arms race with microorganisms - the only real threat to our existence - and trace the alarming spread of resistance among pathogens that cause disease.

Why Sex? - 60 minutes

Grade Level: 
Middle
High
Length: 
01:20
The Evolutionary Arms Race & Why Sex?

Pages