This research was undertaken to determine the effect on growth of Tetrahymena pyriformis of a single stress followed at some later time by a second stress, using temperature change and osmotic pressure change as stress factors.
Growth rate of T. pyriformis was determined under standard conditions of temperature and osmotic pressure (29°C and 100 milliosmols). A single stress consisting of a decrease in temperature to 20°C or an increase in osmotic pressure to 300 milliosmols was applied to an exponentially growing culture and its effect noted. After a recovery period a second, different stress was applied to the culture J and its effect noted.
Prom results of these experiments the following conclusions were reached: (1) Either single stress caused a k, brief lag, followed by resumption of exponential growth at a lesser rate. (2) The order in which the stresses were applied did not change their overall effect on growth. (3) The most obvious effect of the double stress was a lengthening of the lag period. (4) The organisms adapted more quickly to the two stresses when a recovery period was allowed between stresses than when both were applied simultaneously.
","abstract_html":"<p>This research was undertaken to determine the effect on growth of Tetrahymena pyriformis of a single stress followed at some later time by a second stress, using temperature change and osmotic pressure change as stress factors.</p> <p>Growth rate of T. pyriformis was determined under standard conditions of temperature and osmotic pressure (29°C and 100 milliosmols). A single stress consisting of a decrease in temperature to 20°C or an increase in osmotic pressure to 300 milliosmols was applied to an exponentially growing culture and its effect noted. After a recovery period a second, different stress was applied to the culture J and its effect noted.</p> <p>Prom results of these experiments the following conclusions were reached: (1) Either single stress caused a k, brief lag, followed by resumption of exponential growth at a lesser rate. (2) The order in which the stresses were applied did not change their overall effect on growth. (3) The most obvious effect of the double stress was a lengthening of the lag period. (4) The organisms adapted more quickly to the two stresses when a recovery period was allowed between stresses than when both were applied simultaneously.</p>","abstract_has_math":false,"creators":["Granum, Janice M."],"institution":null,"degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Biomedical Sciences","degree_department":null,"school":null,"contributors":[],"advisors":[],"committee_chairs":[],"committee_members":[],"year":1967,"date_issued":"1967-01-01T08:00:00Z","date_published":"1967-01-01T08:00:00Z","updated_at":"2026-07-24T03:25:20Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://commons.und.edu/theses/505","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:creator","label":"Author","values":["Granum, Janice M."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Biomedical Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Master of Science (MS)"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://commons.und.edu/theses/505"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["This research was undertaken to determine the effect on growth of Tetrahymena pyriformis of a single stress followed at some later time by a second stress, using temperature change and osmotic pressure change as stress factors.
Growth rate of T. pyriformis was determined under standard conditions of temperature and osmotic pressure (29°C and 100 milliosmols). A single stress consisting of a decrease in temperature to 20°C or an increase in osmotic pressure to 300 milliosmols was applied to an exponentially growing culture and its effect noted. After a recovery period a second, different stress was applied to the culture J and its effect noted.
Prom results of these experiments the following conclusions were reached: (1) Either single stress caused a k, brief lag, followed by resumption of exponential growth at a lesser rate. (2) The order in which the stresses were applied did not change their overall effect on growth. (3) The most obvious effect of the double stress was a lengthening of the lag period. (4) The organisms adapted more quickly to the two stresses when a recovery period was allowed between stresses than when both were applied simultaneously.
"]},{"key":"dc:title","label":"Title","values":["The Effect of a Second Stress on Growth of Tetrahymena Pyriformis"]}]}],"canonical_facts":{"dc:creator":["Granum, Janice M."],"dc:description.abstract":["This research was undertaken to determine the effect on growth of Tetrahymena pyriformis of a single stress followed at some later time by a second stress, using temperature change and osmotic pressure change as stress factors.
Growth rate of T. pyriformis was determined under standard conditions of temperature and osmotic pressure (29°C and 100 milliosmols). A single stress consisting of a decrease in temperature to 20°C or an increase in osmotic pressure to 300 milliosmols was applied to an exponentially growing culture and its effect noted. After a recovery period a second, different stress was applied to the culture J and its effect noted.
Prom results of these experiments the following conclusions were reached: (1) Either single stress caused a k, brief lag, followed by resumption of exponential growth at a lesser rate. (2) The order in which the stresses were applied did not change their overall effect on growth. (3) The most obvious effect of the double stress was a lengthening of the lag period. (4) The organisms adapted more quickly to the two stresses when a recovery period was allowed between stresses than when both were applied simultaneously.
"],"dc:identifier":["https://commons.und.edu/theses/505"],"dc:title":["The Effect of a Second Stress on Growth of Tetrahymena Pyriformis"],"thesis:degree_discipline":["Biomedical Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T03:25:20Z"}