Answer to Question 1
Answer: One of the survival benefits of positive emotions may lie in their role in undoing some of the psychological and physiological damage of negative emotions. Research has shown that subjects who are encouraged to feel good recovered baseline heart rate faster than control subjects. Positive emotions lessened the cardiovascular activity associated with anxiety, and they did so even for African Americans.
Answer to Question 2
Answer: The textbook points out that there are some interesting differences between negative and positive emotions, in general. Positive emotions dont involve as much physiological arousal as negative emotions, for one. Fear is just more physiologically arousing than joy. Also, there is a much larger variety of negative emotions: three or four times as many. Also, there are many more unique facial expressions associated with negative emotions. Almost all positive emotions seem to be expressed facially through the Duchenne, or true, smile. Positive emotions must have survival value, but they do not have the same intensity or urgency. Negative emotions are compelling and cause strong reactions.
Methyl-directed mismatch repair in E. coli
The logistic growth model does not describe all populations.
Effects of a Targeted Deletion of the μ Opiate Receptor
Social and Environmental Effects of Tourism in the Andaman Islands
A positive feedback loop.
An example of nucleotide excision repair. UVR proteins remove UV-induced damage from DNA strands