Bio 104 So Far How Science Gets Done Arabidopsis as a Model Organism

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Presentation transcript:

Bio 104 So Far How Science Gets Done Arabidopsis as a Model Organism To study growth and development under different environmental conditions (stimulus….response) Adaptations to environments around the globe Ecotypes and speciation process Effects of genetic mutations ** Plant physiology ** Experimental design and the scientific method

So Far Cell metabolism and macromolecules Dr. Moeller’s lectures: Origins and Diversity of Life on Earth Environmental conditions over geologic time: Temperature, oxygen, carbon dioxide, water, solar radiation Changes conditions over time accompanied by changes in living things that were able to change rapidly enough through the process of natural selection If changes are too rapid for organisms to adapt…... Extinction!

What’s Next? Communicate results of our 6 experiments in scientific poster format Work with Animals! Humans, crocs, gators, turtles, and African Clawed Toads! Physiology and behavior Stimulus and response Homeostasis of Body temperature = thermoregulation Reminder: testing ideas for use in Fall 2009 Bio 150 course with 225 students

Lab This Week: 1) Record and Analyze Electrocardiograms 2) Diagnose abnormal Electrocardigrams Future Labs: Record electrocardiograms from crocs, gators, and turtles The question: Do changes in environmental temperature or metabolism affect heart rate?

Homeostasis: The relative constancy of the internal environment Steady state vs. equilibrium

Humans have ~200 cell types The body: A society of interdependent cells, each type with its own needs and contributions. 01.01a.jpg Humans have ~200 cell types

O2 List parameters Steady state Vs Equilibrium SET POINT

Cell Membrane: selectively permeable Invasive vs Non-invasive measurements Cell Membrane: selectively permeable Capillaries: highly permeable except to proteins

Homeostasis Regulated via reflex arcs and naturally maintained by the process of negative feedback Measurements Which physiological variables? Averages and ranges

Fig. 01.08 Set points for some parameters have normal diurnal variations. 01.08.jpg

Thermoregulation

Physics of thermal energy flow Cell metabolism= main source of heat in endotherms (mammals, birds)

Conduction Convection Evaporation Radiation

Mechanisms of thermoregulation For constant body temp heat in = heat out Reflex arc Negative feedback Examples Acclimatization vs. adaptation