BIOLOGICAL RHYTHMS: ITS A MATTER OF TIME Text: Rhythms of Life Russell Foster and Leon Kreitzman What are Biological Rhythms? What are Rhythms? What is a rhythm? Pattern Sequence
Regularity Progression Time Measure Beat Rhythm = sequence of events that repeat themselves in the same order and with the same time interval, over and over again. Biological rhythm: a biological event or function with a
pattern of activity that is repeated over and over again at a constant time interval. What are examples of Biological Rhythms? Biological Rhythms Heart rate Breathing Hormone secretion Menstrual cycle
Body temperature Sleep/wake cycle Time Biological Rhythms are the product of an internal biological timekeeping system which is controlled by a biological clock Chronobiology
Two Broad Categories of Biological Rhythms high frequency Ultradian Those that have a constant relationship with environmental rhythms Have a geophysical counterpart ENVIRONMENTAL RHYTHMS Semi-Daily Rhythms Tidal
Daily Rhythms Solar Monthly Lunar Quarterly Seasons Annual
Longer than a year Spinning of earth on its axis 24h solar day Movement of earth around sun 365 days year
Tilting of earth on its axis seasons Movement of moon around earth 24.53 days lunar month 24.8h lunar day Geophysical
Types of biological rhythms with a geophysical counterpart: Period Length Name Chronobiological Name
Example 12.4 h tidal CIRCA TIDAL crab activity on shoreline
29 days monthly CIRCA LUNAR menstrual cycle, marine reproduction. 365 days
yearly CIRCANNUAL Hibernation, many reproductive cycles. 24 h daily
CIRCADIAN (circa + diem) sleep-wake cycle and many others infradian What Kind of Organisms Have Biological Rhythms? What is the purpose of having a biological timekeeping system?
Promotes organisms ability to survive by coordinating its activities with changes in the environment Coordinates internal processes STROMATOLITE Many organisms have several kinds of biological rhythms Alexander the Great 4th Century BC
Tamarind Tree de Mairan, 1729 endogenous Du Monceau 1759 Circadian rhythms do not depend on temperature changes Linneaeus 1751 Circadian rhythms are genetically determined
Linneaeus 1751 de Candolle 1832 When not exposed to environmental day/night rhythms plant leaves opened and closed on a 22 23 h cycle instead of a 24 h cycle Free-running rhythm Circadian rhythms are endogenous.
Endogenous rhythms are not exactly 24h. The periods of Circadian rhythms are genetically determined. Endogenous rhythms are temperature-compensated Bees 1910 1929 Forel Beling
Arial Comic Sans MS Crayons Childhood Disorders Common Associated Diagnoses Behavioral Definitions Behavioral Definitions Behavioral Definitions History of Attachment Critical period for the development of attachment Mary Ainsworth's Research Model Infant Characteristics that promote attachment Infant & Mother characteristics that...
Broken Record Don't take the bait "I hear what you're saying…" Three strikes You're out! The One-minute lecture 30 seconds of feeling 10 seconds of silence 20 seconds of compassion The Teacher - An Instrument of Power by Haim Ginott...
Common Mode Analysis. Failure Modes Effects Testing (FMETs), Fault Insertion Testing (FIT) and Failure Immunity Testing (FIT) dovetail well and are mutually enhancing with the APR functional approach. SAE ARP 4761 Process.
History of Causal Analysis. Farrokh Alemi, Ph.D. This is an introduction to the course on comparative effectiveness, HAP 823. This presentation is based on April 2013 lecture by Judea Pearl titled "The Mathematics of Causal Inference: With Reflections on Machine...
required to maintain a cash book or use day books. Cash sales will be processed through a main cash account and sales account in the ledger. Sales and purchases on credit will be processed through sales/purchases account in the ledger...