An examination of the perceived advantages of organic food in terms of safety, nutrition and taste, followed by a comparison of the costs and yield efficiencies of conventional versus organic farming techniques.

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A discussion of the history of organic agriculture, the philosophy behind it, and the main methods used. Also includes a look at the environmental benefits of organic farming, including the effects on erosion, water pollution and biodiversity.

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The first in a two-part episode covering the circulatory and respiratory systems, including a discussion of the anatomy of the heart, the process of contraction, and the generation and propagation of electrical activity. I also discuss how the heart functions as a pump, the various types of blood vessels, and control of the heart rate by the brain. Recommended pre-listening is Episode 25: Tissues, Organs and Systems, and Episode 26: Human Organ Systems.

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An analysis of corporate conspiracy theories, including the alleged suppression of the cure for cancer and sabotage of the electric car. Using economic analysis and game theory, I outline the true incentives and constraints facing the firms in these industries, and explain why any such conspiracies would be enormously difficult to pull off.

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An overview of the underlying mechanisms of pain, including the role of nociception, transduction of nociceptor signals by spinal pathways, the modulatory effects of opioids, and processing of these inputs in the brain. I also discuss phenomena such as referred pain, psychogenic pain, and congenital insensitivity to pain.

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Building on the previous discussion of Hartree-Fock Theory, I discuss the inclusion of basis functions to produce the Roothaan equations, and the method of solving these using self-consistent field methods. I then provide an introduction into techniques to incorporate electron correlation by adding Slater determinants, focusing on the Configuration Interaction method. I then provide a brief overview of semi-empirical methods, Density Functional Theory, and molecular mechanics. Recommended pre-listening is Episode 119: Computational Chemistry Part 1.

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An overview of techniques of determining molecular structure, including an introduction to valance bond theory covering bond formation and orbital hybridisation, and a discussion of the basics of molecular orbital theory, covering the basics of the Hartree-Fock method for solving the Schrödinger equation and finding molecular orbitals. In the process I also discuss the Pauli exclusion principle, the effect of electron spin, and the indistinguishability of electrons.

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A discussion of cell communication and signalling, including an overview of the purpose of cell signalling, the main types of signals, and applications such as hormones, neurotransmitters, and cytokines. The difference between G protein-coupled receptors, enzyme-linked receptors, and intracellular receptors is also considered, concluding with a summary of the process of signal transduction and the role of second messengers. Recommended pre-listening is Episode 116: The Cell Membrane.

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A discussion of the transportation and sorting of proteins within the eukaryotic cell, including an overview of the endomembrane system, the mechanisms of nuclear transport, transmembrane transport, and vesicular transport. I also consider the structure and functions of the endoplasmic reticulum, the Golgi apparatus, and lysosomes, and how they are joined together in a complex network of protein transportation and vesicular traffic. Recommended pre-listening is Episode 116: The Cell Membrane.

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An introduction to the cell membrane, including a discussion of the structure of the bilipid membrane, an overview of the structure and function of membrane proteins, a review of the fluid mosaic model, and a discussion of mechanisms of membrane transport, including both passive and active transport. Recommended pre-listening is Episode 10: The Cell, and Episode 18: Biochemistry Basics.

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