Microscopic viewing of bacteria under oil immersion
By: Tami Port MS
Before bacteria can be viewed through a microscope, a bacterial smear must first be created and then heat fixed. Heat fixing kills the microbes and firmly attaches them to the slide, so that the sample is not washed away during the staining procedure. * Simple...
MacConkey's agar (MAC) bacterial growth medium
By: Tami Port MS
When bacterial cultures are grown in a laboratory, they are growing in a captive environment, somewhat like a tiny microbial zoo. These captive-bred bacteria are totally dependent on people to provide the proper environment for their survival and growth. A nutrient-rich media is required in...
By: Janet Grischy
A neuron is a nerve cell, a specialized cell that conducts nerve impulses. Its function is to transmit information throughout the body and brain. Sensory neurons transmit information from the senses to the spinal cord and brain. Motor neurons send information in the other direction...
By: Tami Port MS
In order to view individual bacteria through a light microscope, a bacterial smear must be attached to a slide and then stained. Here is the procedure. First, use a wax pencil to draw a circle on the microscope slide to separate each type of bacteria...
Comparison of sexual and asexual reproduction
By: Jon Clark
The comparison between sexual and asexual reproduction is actually quite a simple one in terms of their functions. Sexual reproduction happens in order to mix up the genes as much as possible and create variation in the offspring - all of which are unique genetically...
By: M E Skeel
The greatest danger to the survival of Antarctic penguins is human interference in the Antarctic ecosystem. From pollution to overfishing to climate change, humans are impacting every ecosystem on earth, including the Antarctic. Climate change is probably the biggest of those three threats to penguins...
By: Louis Rosenfeld
The cell membrane separates a cell from its watery environment. It does so because it is composed of water-insoluble phospholipids and proteins. The phospholipids form a bilayer sheet surrounding the cellular contents; much like a bubble surrounds air. Proteins are embedded in the phospholipid bilayer...
By: Erich Rosenberger M.D.
The liver is the largest gland in the body. It's a huge organ that sits roughly in the middle of your abdomen. It is a hugely important gland that is responsible for a wide range of metabolic and chemical reactions that are vital to living...
Overview of cell biology
By: Jon Clark
All living things are made up of cells. So understanding what a cell is and what it is made up of is very important in Biology. Cells are rather tiny - you could fit about 100 on a pin head. They contain even tinier little...
By: Janet Grischy
Wilderness survival handbooks often warn readers not to eat colorful bugs. Many insects are fine survival food, apparently, but not all. The colorful ones are more likely to be unwholesome. Evidently, it is not enough for an insect or spider to be poisonous, it must...

 

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