Agonist concentration

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  • Nicotine is no longer possible, even in the face of an intensive and synchronized release of ACh (C). Although nicotine mimics the action of ACh at the receptors, it cannot duplicate the time course of intrasynaptic agonist concentration required for appropriate high-frequency ganglionic activation. The concentration of nicotine in the synaptic cleft can neither build up as rapidly as that of ACh released from nerve terminals nor can nicotine be eliminated from the synaptic cleft as quickly as ACh.

    pdf10p bigbaby87 04-09-2010 62 18   Download

  • For about four decades now, a course in receptor pharmacology has been given at University College London for undergraduate students in their final year of study for the Bachelor of Science degree in pharmacology. More recently, the course has also been taken by students reading for the Bachelor of Science degree in medicinal chemistry. The students following the course have relied for their reading upon a variety of sources, including original papers, reviews, and various textbooks, but no single text brought together the material included in the course.

    pdf302p mnemosyne75 02-02-2013 19 5   Download

  • Fatty acids can stimulate the secretory activity of insulin-producing beta-cells. At elevated concentrations, they can also be toxic to isolated beta-cells. This toxicity varies inversely with the cellular ability to accumulate neutral lipids in the cytoplasm. To further examine whether cytoprotection can be achieved by decreasing cytoplasmic levels of free acyl moieties, we investigated whether palmitate toxicity is also lowered by stimulating its b-oxidation.

    pdf12p media19 05-03-2013 16 1   Download

  • Fluorescence ratio imaging indicates that immobilized, aspirin-treated platelets, loaded with Fura-2, respond to inositol 1,4,5-trisphosphate- (InsP3)-generating agonists such as thrombin by high-frequency, irregular rises in cytosolic [Ca 2+ ] i with spikes that vary in peak level and peak-to-peak interval. This differs from the regular [Ca 2+ ] i oscillations observed inother, larger cells.

    pdf10p research12 29-04-2013 17 1   Download

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