Proton exchange membrane fuel cell

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  • The Effects Of High Organature Proton Exchange Fuel Cells

    High temperature proton exchange membrane fuel cells (HT-PEMFCs) are a promising clean technology, especially for automobile applications.1 These devices generate electricity from the chemical reactions that occur in the anode side of the cell, using H2 as a fuel and generating heat and water as by-products.2, 3 However, experimental studies using HT-PEMFCs show that degradation of the cell can occur after certain hours of operation (around 500 hours).4 Some of the factors that contribute to the degradation of the HT-PEMFCs are rupture of the bulk polymer backbone of the membrane, H3PO4 loss and poisoning of the catalyst layer.5 These degradation problems must be overcome in order to commercialize this type of fuel cells.5 Consequently, extensive…

    Words: 1485 - Pages: 6
  • Green Fluorescent Protein (GFP)

    body such as the firing of action potentials in neuronal cells in the brain. The research presented in the paper “High-Fidelity optical reporting of neuronal electrical activity with an ultrafast fluorescent voltage sensor” shows just how far brain mapping has come and how far it still has to go before all pathways are truly understood. This paper presents the medical community the opportunity to harness the versatility of Green Fluorescent Protein (GFP) in order to show how action potentials…

    Words: 1522 - Pages: 7
  • Osmosis And Hypertonic Solution

    type of transport located in the cell membrane. Diffusion could also be described as the movement of molecules from areas of high concentration to areas of low concentration. The molecules do this because all molecules are constantly moving, so in enough time the molecules will spread evenly. According to figure 1, the cell will make the outside solution the same concentration of water as the concentration on the inside. In higher temperatures the faster diffusion will happen because of the…

    Words: 1063 - Pages: 5
  • Pyrimidines: The Basic Structure Of DNA And RNA

DNA and RNA are found in the nuclei of all cells and their job is to transmit the information needed for cellular growth and reproduction (Averill & Eldredge, 2007). 2. The number of carbons and the branching determines the boiling point, where the higher of either increases the boiling point. The reason behind this is hydrogen bonding (Clark, 2003). In ethanol there is an -OH group present. The oxygen pulls…

    Words: 1137 - Pages: 5
  • Viral Pathogens Essay

    Viral pathogens use liver cells to replicate, then attach to their lipid droplets to to accumulate, assemble and bud off into the rest of the body. Liver produces and secretes LDL, VLDL and HDL which are taken up by every cell in the body that uses cholesterol, including the liver cells that take them up too.2 Viruses hijack these lipoproteins and use them to get into the liver cells, where they replicate, which opens up a gateway to the rest of the body. They replicate within the endoplasmic…

    Words: 1044 - Pages: 5
  • Diffusion Across Plasma Membrane Lab Report

    Diffusion Across a Plasma Membrane Lab The purpose of this lab was to learn about the permeability of plasma membranes. In this experiment, dialysis tubing was used to simulate the semipermeable plasma membrane of a caterpillar’s intestine. Cooked starch was prepared and mixed with the enzyme amylase to simulate the mixing of the caterpillar’s saliva with a starch/leaf and then placed in the dialysis tubing to simulate the beginning of the digestive process. The enzyme amylase breaks down…

    Words: 1273 - Pages: 6
  • Cell Signaling And Cell Transduction Essay

    CELL SIGNALING AND CELL TRANSDUCTION INTRODUCTION: In this lecture, we will study about cell signaling and signal transduction. Each cell in a multicellular animal is bombarded with chemical signals that are made by other cells and this is how communication occurs at cells level by different signaling molecule. Signals that regulate cell metabolism, alter or maintain its differentiated state, determine whether it should divide, and dictate whether it will live or die. The word “signals” in…

    Words: 2018 - Pages: 9
  • Rhodopsin In ROS Membranes Case Study

    Early studies on the lateral diffusion of rhodopsin in ROS membranes resulted in viewing this visual receptor as monomeric entity freely diffusing in a phospholipid bilayer (Calvert et al., 2001; Chabre et al., 2003; Liebman et al., 1982; Poo and Cone, 1974). However, it is important to stress that the movement of rhodopsin restricted to approximately two-dimensional environment of membranous phospholipid bilayer would rather reduce its dynamic freedom by orders of magnitude relative to soluble…

    Words: 1082 - Pages: 4
  • Cell Membranes Lab Report

    The Effects of Temperature on Cellular Membranes Kean University: Biology 1300 Section 3 Liyet Iran Partners: Paoline Medina, Jennifer Yuen, Christian Gonzalez, D’wan McCrary, Nicole Piscatelli November 12, 2015 Abstract The cell membrane is an essential structure of any cell. It’s the structure that protects and support the cell. To determine whether this structure can withstand hot or cold environment, a beet specimen is put to test. Six consistent cylindrical beet will…

    Words: 1574 - Pages: 7
  • Phagocytosis Experiment

    Tetrahymenas are freshwater ciliated protozoan and are the ideal candidates for the study of cells for students (Bozzone 1). Another benefit of using tetrahymena is that they can be easily grown in a lab. These eukaryotes are found in fresh water ponds, streams, and lakes (Ciliate Genomic Consortium). Phagocytosis carried out by only a few organisms that are specialized for the uptake of large particles from the environment (Karp 315). The tertrahymena feeds by undertaking phagocytosis. The oral…

    Words: 1754 - Pages: 8
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