But too many have a narcotic effect.
"The CO2 has a narcotic effect on the rodent, which puts it to sleep very quickly," explains Brigham.
Ever since President John F. Kennedy's assassination, Americans have learned not to count too much on tranquil television viewing during the Thanksgiving season, yet Macy's parades and college football games still have a narcotic effect.
The substance will be analyzed to see if it is oil, but one theory is that the animal could have been disoriented by oil exposure, which can have a narcotic effect, rendering it incapable of avoiding a boat strike.
This in itself produces a narcotic effect, but if the pressure is reduced too rapidly, the excess nitrogen evolves as bubbles of gas in various locations in the body.
Though large doses of the toxin can be deadly, in small amounts it is known to produce a narcotic effect, and the dolphins appeared to have worked out how to make the fish release just the right amount.
Swinburne's technical gifts and capacity for prosodic invention were extraordinary, but too often his poems' remorseless rhythms have a narcotic effect, and he has been accused of paying more attention to the melody of words than to their meaning.
But a senior American official did say intelligence sources had indicated that the Russians probably used an aerosol form of Fentanyl, "or a derivative that has a narcotic effect," by itself or in combination with another compound, in their desperate bid to free the hostages.
According to Rabbi Nachman of Breslov, the Hasidic mystic (1772-1810), "you are wherever your thoughts are" — an aphorism that inspired the title of Steve Reich's "You Are (Variations)." Mr. Reich's music often has a narcotic effect on the listener, its undulating rhythms and shifting sonorities inspiring a state of trancelike concentration.
Pufferfish are toxic, but in small doses the neurotoxin they release seems to have a narcotic effect.
