1. KEY CONCEPT Technology continually changes the way biologists work.

2. Imaging technologies provide new views of life.
A microscope provides an enlarged image of an object.
light microscopes (LM)
Uses light and lenses; magnifies to 2000X; can study living organisms
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3. Imaging technologies provide new views of life.
scanning electron microscopes (SEM)- 3-D black and white image of the surface; magnifies to 200,000X; no living specimens
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5. Dust mites tick dust mite

6. Eyelash mites

7. Imaging technologies provide new views of life.
transmission electron microscopes (TEM) – electrons pass through a specimen; 2D black and white image; no living specimens
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8. Bivalve gill

9. Imaging technology is used in medicine.
X-ray images
Pass through dense
tissues, bones and
teeth

10. Imaging technology is used in medicine.
magnetic resonance imaging (MRI)
Magnetic field shows all tissues,
including soft tissues like tendons and ligaments.

11. Imaging technology is used in medicine.
functional MRI (fMRI)
Magnetic field can be
used to show activity
in certain brain
regions, while the
subject is performing a task.

12. Computerized tomography (CT or CAT scan)
Combines a series of X-ray views taken from many different angles and computer processing to create cross-sectional images of bones and tissues (from Mayo Clinic Web site)
Compared to looking down at a slice of bread compared to the whole loaf
Risks: too many X-rays can
pose a cancer risk, but may
be needed in cases of trauma
or illness

13. Complex systems are modeled on computers.
Computer models are used to study systems that cannot be studied directly.
heart attacks
Normal heartbeat
effect of medicines on the human body
movement of water molecules into and out of a cell
spread of a disease through a population
Heart attack
Computer models are used when experiments are not safe, ethical, or practical.

14. The tools of molecular genetics give rise to new biological studies.
A gene is a segment of DNA that stores genetic information.

15. Through our understanding of DNA, we can study genetics on a molecular level.
molecular genetics
genomics