Finals Sem 1 /Thermodynamic

Thermodynamics of Life

1. Introduction to Thermodynamics

 - The study of energy and its transformation

2. Understanding Temperature

 - Definition and importance of temperature in thermodynamics
 - Range of temperature observed in various systems (like -10, 20, -30, etc.)

3. The Arrow of Time

 - Concept introduced by Arthur Stanley Eddington (1882-1944)
 - Relation of time direction with entropy and thermodynamic processes
 - Discussion of diffusion and its relevance
 - Query: "Is this process reversible? Why?"

4. Life and Thermodynamics

 - Question: "Is life a perpetual motion machine?"
 - Explanation on how life contradicts the second law of thermodynamics:
   - Life moves contrary to the tendency of isolated systems to increase entropy (disorder).
   - Reference to the spontaneous nature of entropy increase in isolated systems.

5. Principles of Thermodynamics in Biology

5.1 First Law of Thermodynamics

 - Definition: Energy is transformed, never destroyed.

5.2 Second Law of Thermodynamics

 - Definition: The Universe progresses towards disorder.
 - Observation: Life trends towards order, establishing systematic and hierarchized structures.

6. Concept of Energy

 - Definition: The capacity to perform work or generate heat.
 - Description of the lack of creation or destruction of energy during transformation.

7. Einstein’s Energy-Mass Relation

 - Equation: $E = mc^2$
 - Significance of the equation in expressing mass-energy equivalence.
 - Clarification on speed of light being a constant.

7.1 General Energy Equation

 - General formula: $E^2 = p^2c^2 + m^2c^4$
   - Here, $p$ represents momentum.
   - In the absence of mass (e.g., photons), energy is described as $E = pc$.
   - If a massless particle is at rest, its total energy is zero.
   - Light, having no mass, always travels at 300,000 km/s, carrying energy through its momentum.

8. The Greenhouse Effect

 - Natural Greenhouse Effect: More heat escapes into space.
 - Human Enhanced Greenhouse Effect: Less heat escapes due to increased greenhouse gases.
 - Example of heat differences in a car: Air Temp: 83°F; Inside Car Temp: 100-110°F after 15 minutes in the sun.

9. Metabolism and Energy in Life

 - Metabolism:
    - Definition: Collective chemical reactions within cells that sustain life.
    - Functions: Allow organisms to acquire energy, build new structures, repair old ones, and reproduce.

10. Types of Energy

 - Different forms of energy:

10.1 Mechanical

10.2 Electric

10.3 Magnetic

10.4 Gravitational

10.5 Chemical

10.6 Ionization

10.7 Nuclear/Atomic

10.8 Elastic

10.9 Sound Wave

10.10 Radiant (Heat)

10.11 Photon

11. Cellular Structures and Energy Transformation

11.1 Mitochondria vs. Chloroplast

 - Key structural differences:
   - Mitochondria: Inner and outer membranes, cristae, involved in cellular respiration.
   - Chloroplasts: Inner bilayer, outer bilayer, thylakoid, involved in photosynthesis.
 - Chemical reactions:
   - Photosynthesis: $6CO_2 + 6H_2O <br>ightarrow C_6H_{12}O_6 + 6O_2$
   - Cellular Respiration: corresponding reactions in mitochondria.

12. Chemical Reactions

12.1 Endothermic and Exothermic Reactions

 - Explanation of energy conservation in chemical changes:
   - Total energy pre and post-reaction remains constant.
   - Endothermic reactions absorb heat, making the reaction cooler than surroundings.
   - Exothermic reactions release heat, making the reaction hotter.

13. Contributions of Erwin Schroedinger

13.1 Quantum Theory Insights

 - Outline of the Schrödinger Equation's role in calculating wave functions and time dynamics.
 - Exploration of life as vectorial, implying direction and purpose:
   - Life necessitates a thermodynamic explanation.

13.2 Laws of Thermodynamics in Relation to Life

13.2.1 First Law of Thermodynamics

 - Expression: $riangle U = Q - W$ (change in internal energy = heat added - work done)

13.2.2 Second Law of Thermodynamics

 - Concept of entropy (S) and its implications:
   - Hot to cold heat flow, measuring disorder in systems.
   - Entropy changes:
     - S_1 > S_2 (irreversible)
     - $S_1 = S_2$ (reversible)

14. The Nature of Life and Entropy

 - Observation that life defies the traditional increase of entropy: life moves from disorder to order.
 - Summary of life feeding on negative entropy (negentropy).
   - Definition and etymology of negentropy and syntropy in biological contexts.

15. Information in Life

15.1 Understanding Information

 - Definition: Information entails direction and shape.
 - Distinction between information and energy:
   - Energy correlates with speed and mass; information relates to movement and direction.
   - Analogies to vehicles:
     - Engine as energy provider; driver as directional influence.

15.2 Data Measurement in Biology

 - Explanation of data units from bits to zettabytes and implications in understanding biological information transfer:
   - One gigabyte equates to the size of Earth; one exabyte approximately equals that of the sun.
 - Annual size of the global datasphere projected growth to 175 ZB by 2025.

16. Intracellular Signaling Pathways

 - Description of the signaling process initiated by extracellular signal molecules:
   - Signal molecules interact with receptor proteins on target cells.
   - Triggering of intracellular pathways leading to altered cellular functions.
   - Example pathway illustrating the interaction of signaling molecules with resultant changes in gene expression, metabolism, and cellular activity.

17. Coordination of Information in Life

 - Three realms of information:
   - Genetic (intrinsic information selected by the environment)
   - Mathematical (structural and abstract information)
   - Sensory (external information elicited by environmental factors)

18. The Asymmetry of Time as Proposed by Eddington

 - Discussion on time's directional nature and non-determinism in modern physics.
 - The unresolved nature of time within the context of life, evolution, surprises, and uncertainties.

19. Conclusion

 - Emphasis on the interconnectedness of genetic, mathematical, and sensory information in defining life.