circannual การใช้

• This pattern is called a " circannual " rhythm.
• "A . verbasci " was the first insect to be shown to have an annual circadian rhythm and to date remains a classic example of circannual cycles in animals.
• He acclimated one group of laboratory woodchucks to a circannual cycle as if they were living in Australia, breeding during the Southern Hemisphere spring, and another group to an eight-month year.
• The mixed-up mammals are part of a continuing investigation of the species'circannual cycles by Dr . Patrick W . Concannon, an endocrinologist and reproductive biologist at Cornell's College of Veterinary Medicine.
• But a grizzled male woodchuck can weigh 12 pounds or more at summer's end, and the animals'size allows researchers to collect ample blood and tissue samples for studying the biological mechanisms underlying its circannual cycles, Concannon said.
• Recent clinical studies, Concannon said, " clearly suggest that humans also have circannual cycles, although not as profound as those in woodchucks, " adding, " These cycles include changes in blood chemistry, hormone secretion, brain activity and appetite ."
• He said that human circannual rhythms, like those of woodchucks, were most likely based on day by day changes in the length of daylight and darkness " although such entrainment may be less precise due to our exposure to artificial lighting schedules at home, work and play ."