Open Access. Powered by Scholars. Published by Universities.®
- Discipline
-
- Chemical Engineering (22)
- Biochemical and Biomolecular Engineering (6)
- Biology and Biomimetic Materials (3)
- Bioresource and Agricultural Engineering (3)
- Chemistry (3)
-
- Materials Science and Engineering (3)
- Physical Sciences and Mathematics (3)
- Catalysis and Reaction Engineering (2)
- Inorganic Chemistry (2)
- Education (1)
- Engineering Education (1)
- Higher Education (1)
- Mechanical Engineering (1)
- Molecular, Cellular, and Tissue Engineering (1)
- Nanoscience and Nanotechnology (1)
- Science and Mathematics Education (1)
- Keyword
-
- Geological and Atmospheric Sciences (4)
- Carbon nanotube (3)
- Catalyst (3)
- Catalysis (2)
- Cell migration (2)
-
- Fibroblast (2)
- Fluorescence microscopy (2)
- Metal nanoparticle (2)
- Molecular stability (2)
- Phosphatidylinositide (2)
- Platelet derived growth factor (2)
- Signal transduction (2)
- Silicon carbide (2)
- 3' phosphoinositide (1)
- Acetic acid derivative (1)
- Adenosine triphosphate (1)
- Agronomy (1)
- Aluminum (1)
- Amine (1)
- Analytical transmission electron microscopy (1)
- Anisole (1)
- Aqueous solubility (1)
- Benzoylation (1)
- Biodegradation (1)
- Biosynthesis (1)
- Biotransformation (1)
- Birck Nanotechnology Center and Bindley Bioscience Center (1)
- Blood vessels (1)
- Brevibacerium (1)
- Carbon nanofiber (1)
- Publication Year
Articles 1 - 28 of 28
Full-Text Articles in Biological Engineering
Fabrication Of Low-Cost Paper-Based Microfluidic Devices By Embossing Or Cut-And-Stack Methods, Martin M. Thuo, Ramses V. Martinez, Wen-Jie Lan, Xinyu Liu, Jabulani Barber, Manza B. Atkinson, Dineth Bandarage, Jean-Francis Bloch, George M. Whitesides
Fabrication Of Low-Cost Paper-Based Microfluidic Devices By Embossing Or Cut-And-Stack Methods, Martin M. Thuo, Ramses V. Martinez, Wen-Jie Lan, Xinyu Liu, Jabulani Barber, Manza B. Atkinson, Dineth Bandarage, Jean-Francis Bloch, George M. Whitesides
Martin M. Thuo
This article describes the use of embossing and “cut-and-stack” methods of assembly, to generate microfluidic devices from omniphobic paper and demonstrates that fluid flowing through these devices behaves similarly to fluid in an open-channel microfluidic device. The porosity of the paper to gases allows processes not possible in devices made using PDMS or other nonporous materials. Droplet generators and phase separators, for example, could be made by embossing “T”-shaped channels on paper. Vertical stacking of embossed or cut layers of omniphobic paper generated three-dimensional systems of microchannels. The gas permeability of the paper allowed fluid in the microchannel to contact …
Mox/Cnts Hetero-Structures For Gas Sensing Applications: Role Of Cnts Defects, G. Neri, S. G. Leonardi, N. Donato, C. Marichy, Jean-Philippe Tessonnier, M.-G. Willinger, Kyeong-Hwan Lee, N. Pinna
Mox/Cnts Hetero-Structures For Gas Sensing Applications: Role Of Cnts Defects, G. Neri, S. G. Leonardi, N. Donato, C. Marichy, Jean-Philippe Tessonnier, M.-G. Willinger, Kyeong-Hwan Lee, N. Pinna
Jean-Philippe Tessonnier
The preparation, characterization and sensing properties of CNT composites with a thin metal oxide (MOx) surface layer is presented. Atomic layer deposition (ALD) was applied for the coating of the inner and outer CNTs walls with thin films of ZnO and SnO2 of precisely controlled thicknesses. Differently treated CNTs with different degree of surface functionalization were used as support for the oxide films. The sensing properties of the obtained composite materials towards NO2 were investigated and related to the morphological and microstructural characteristics of both the coating and support. SnO2-based composites on CNTs treated at 700 °C show enhanced performance …
Labeling And Monitoring The Distribution Of Anchoring Sites On Functionalized Cnts By Atomic Layer Deposition, Catherine Marichy, Jean-Philippe Tessonnier, Marta C. Ferro, Kyeong-Hwan Lee, Robert Schlogl, Nicola Pinna, Marc-Georg Willinger
Labeling And Monitoring The Distribution Of Anchoring Sites On Functionalized Cnts By Atomic Layer Deposition, Catherine Marichy, Jean-Philippe Tessonnier, Marta C. Ferro, Kyeong-Hwan Lee, Robert Schlogl, Nicola Pinna, Marc-Georg Willinger
Jean-Philippe Tessonnier
The chemical inertness of graphite and, in the case of tubes, of rolled up few layer graphene sheets, requires some degree of "defect engineering" for the fabrication of carbon based heterostructured materials. It is shown that atomic layer deposition provides a means to specifically label anchoring sites and can be used to characterize the surface functionality of differently treated carbon nanotubes. Direct observation of deposited titania by analytical transmission electron microscopy reveals the location and density of anchoring sites as well as structure related concentrations of functional groups on the surface of the tubes. Controlled functionalization of the tubes therefore …
Direct Pore‐Level Observation Of Permeability Increase In Two‐Phase Flow By Shaking, Igor A. Beresnev, William Gaul, R. Dennis Vigil
Direct Pore‐Level Observation Of Permeability Increase In Two‐Phase Flow By Shaking, Igor A. Beresnev, William Gaul, R. Dennis Vigil
R. Dennis Vigil
Increases in permeability of natural reservoirs and aquifers by passing seismic waves have been well documented. If the physical causes of this phenomenon can be understood, technological applications would be possible for controlling the flow in hydrologic systems or enhancing production from oil reservoirs. The explanation of the dynamically increased mobility of underground fluids must lie at the pore level. The natural fluids can be viewed as two-phase systems, composed of water as the wetting phase and of dispersed non-wetting globules of gas or organic fluids, flowing through tortuous constricted channels. Capillary forces prevent free motion of the suspended non-wetting …
Thickness Of Residual Wetting Film In Liquid-Liquid Displacement, Igor A. Beresnev, William Gaul, R .Dennis Vigil
Thickness Of Residual Wetting Film In Liquid-Liquid Displacement, Igor A. Beresnev, William Gaul, R .Dennis Vigil
R. Dennis Vigil
Core-annular flow is common in nature, representing, for example, how streams of oil, surrounded by water, move in petroleum reservoirs. Oil, typically a nonwetting fluid, tends to occupy the middle (core) part of a channel, while water forms a surrounding wall-wetting film. What is the thickness of the wetting film? A classic theory has been in existence for nearly 50 years offering a solution, although in a controversial manner, for moving gas bubbles. On the other hand, an acceptable, experimentally verified theory for a body of one liquid flowing in another has not been available. Here we develop a hydrodynamic, …
Forced Instability Of Core-Annular Flow In Capillary Constrictions, Igor A. Beresnev, William Gaul, R. Dennis Vigil
Forced Instability Of Core-Annular Flow In Capillary Constrictions, Igor A. Beresnev, William Gaul, R. Dennis Vigil
R. Dennis Vigil
Instability of fluid cylinders and jets, a highly nonlinear hydrodynamic phenomenon, has fascinated researchers for nearly 150 years. A subset of the phenomenon is the core-annular flow, in which a non-wetting core fluid and a surrounding wall-wetting annulus flow through a solid channel. The model, for example, represents the flow of oil in petroleum reservoirs. The flow may be forced to break up when passing through a channel’s constriction. Although it has long been observed that the breakup occurs near the neck of the constriction, the exact conditions for the occurrence of the forced breakup and its dynamic theory have …
Blood Vessel Tissue Prestress Modeling For Vascular Fluid–Structure Interaction Simulation, Ming-Chen Hsu, Yuri Bazilevs
Blood Vessel Tissue Prestress Modeling For Vascular Fluid–Structure Interaction Simulation, Ming-Chen Hsu, Yuri Bazilevs
Ming-Chen Hsu
In this paper we present a new strategy for obtaining blood vessel tissue prestress for use in fluid–structure interaction (FSI) analysis of vascular blood flow. The method consists of a simple iterative procedure and is applicable to a large class of vascular geometries. The formulation of the solid problem is modified to account for the tissue prestress by employing an additive decomposition of the second Piola–Kirchhoff stress tensor. Computational results using patient-specific models of cerebral aneurysms indicate that tissue prestress plays an important role in predicting hemodynamic quantities of interest in vascular FSI simulations.
Microbiosensors Based On Dna Modified Single-Walled Carbon Nanotube And Pt Black Nanocomposites, Jin Shi, Tae-Gon Cha, Jonathan C. Claussen, Alfred R. Diggs, Jong Hyun Choi, D. Marshall Porterfield
Microbiosensors Based On Dna Modified Single-Walled Carbon Nanotube And Pt Black Nanocomposites, Jin Shi, Tae-Gon Cha, Jonathan C. Claussen, Alfred R. Diggs, Jong Hyun Choi, D. Marshall Porterfield
Jonathan C. Claussen
Glucose and ATP biosensors have important applications in diagnostics and research. Biosensors based on conventional materials suffer from low sensitivity and low spatial resolution. Our previous work has shown that combining single-walled carbon nanotubes (SWCNTs) with Pt nanoparticles can significantly enhance the performance of electrochemical biosensors. The immobilization of SWCNTs on biosensors remains challenging due to the aqueous insolubility originating from van der Waals forces. In this study, we used single-stranded DNA (ssDNA) to modify SWCNTs to increase solubility in water. This allowed us to explore new schemes of combining ssDNA-SWCNT and Pt black in aqueous media systems. The result …
Molecular Dynamics Simulation Of Fractal Aggregate Diffusion, Gaurav Pranami, Monica H. Lamm, R. Dennis Vigil
Molecular Dynamics Simulation Of Fractal Aggregate Diffusion, Gaurav Pranami, Monica H. Lamm, R. Dennis Vigil
R. Dennis Vigil
The diffusion of fractal aggregates constructed with the method by Thouy and Jullien [J. Phys. A 27, 2953 (1994)] comprised of Np spherical primary particles was studied as a function of the aggregate mass and fractal dimension using molecular dynamics simulations. It is shown that finite-size effects have a strong impact on the apparent value of the diffusion coefficient (D), but these can be corrected by carrying out simulations using different simulation box sizes. Specifically, the diffusion coefficient is inversely proportional to the length of a cubic simulation box, and the constant of proportionality appears to be independent of …
Reversible Addition - Fragmentation Chain Transfer In Microemulsions: Effect Of Chain Transfer Agent Aqueous Solubility, Jennifer M. O'Donnell, Eric W. Kaler
Reversible Addition - Fragmentation Chain Transfer In Microemulsions: Effect Of Chain Transfer Agent Aqueous Solubility, Jennifer M. O'Donnell, Eric W. Kaler
Jennifer M. Heinen
Microemulsion polymerizations are attractive for investigating compartmentalization effects in heterogeneous reversible addition - fragmentation chain transfer (RAFT) polymerizations because the propagating radicals are segregated into surfactant stabilized polymer particles, which drastically reduces the effects of biradical termination, Also, microemulsion polymerizations do not involve the large monomer droplets that are present in emulsion and miniemulsion polymerizations. RAFT microemulsion polymerizations of butyl aery late with a high water solubility chain transfer agent, methyl-2-(O-ethylxanthyl)propionate (MOEP), and a low water solubility chain transfer agent, methyl-2-(O-dodecylxanthyl)propionate (MODP), were investigated to determine the effect of chain transfer agent compartmentalization on the control of the polymerization. The …
Influence Of The Graphitisation Of Hollow Carbon Nanofibers On Their Functionalisation And Subsequent Filling With Metal Nanoparticles, Jean-Philippe Tessonnier, Dirk Rosenthal, Frank Girgsdies, Julien Amadou, Dominique Begin, Cuong Pham-Huu, Dang Sheng Su, Robert Schlogl
Influence Of The Graphitisation Of Hollow Carbon Nanofibers On Their Functionalisation And Subsequent Filling With Metal Nanoparticles, Jean-Philippe Tessonnier, Dirk Rosenthal, Frank Girgsdies, Julien Amadou, Dominique Begin, Cuong Pham-Huu, Dang Sheng Su, Robert Schlogl
Jean-Philippe Tessonnier
The functionalisation of carbon nanomaterials with the standard nitric acid treatment is greatly influenced by their graphitic character. The structural order directs the density as well as the nature of the created functional groups and, as a consequence, influences the efficiency of their filling with metal nanoparticles.
Amino-Functionalized Carbon Nanotubes As Solid Basic Catalysts For The Transesterification Of Triglycerides, Alberto Villa, Jean-Philippe Tessonnier, Olivier Majoulet, Dang Shen Su, Robert Schlogl
Amino-Functionalized Carbon Nanotubes As Solid Basic Catalysts For The Transesterification Of Triglycerides, Alberto Villa, Jean-Philippe Tessonnier, Olivier Majoulet, Dang Shen Su, Robert Schlogl
Jean-Philippe Tessonnier
Multiwalled carbon nanotubes grafted with various amino groups show high activity and stability when used as basic catalysts for the transesterification of triglycerides.
Selective Deposition Of Metal Nanoparticles Inside Or Outside Multiwalled Carbon Nanotubes, Jean-Philippe Tessonnier, Ovidiu Ersen, Gisela Weinberg, Cuong Pham-Huu, Dang Sheng Su, Robert Schlogl
Selective Deposition Of Metal Nanoparticles Inside Or Outside Multiwalled Carbon Nanotubes, Jean-Philippe Tessonnier, Ovidiu Ersen, Gisela Weinberg, Cuong Pham-Huu, Dang Sheng Su, Robert Schlogl
Jean-Philippe Tessonnier
A general method is described for the deposition of metal nanoparticles selectively either inside or outside of carbon nanotubes (CNTs). The method is based on the difference in the interface energies of organic and aqueous solutions with the CNT surface. Because of their lipophilic character, the organic solvent better wets the surface of the nanotubes compared to water and penetrates into the inner volume. The precise control of the volume of each phase allows filling the CNT with the organic phase and covering its outer surface with the aqueous one. Hence, metal nanoparticles can be put with high selectivity either …
Dna Assembler, An In Vivo Genetic Method For Rapid Construction Of Biochemical Pathways, Zengyi Shao, Hua Zhao, Huimin Zhao
Dna Assembler, An In Vivo Genetic Method For Rapid Construction Of Biochemical Pathways, Zengyi Shao, Hua Zhao, Huimin Zhao
Zengyi Shao
The assembly of large recombinant DNA encoding a whole biochemical pathway or genome represents a significant challenge. Here, we report a new method, DNA assembler, which allows the assembly of an entire biochemical pathway in a single step via in vivo homologous recombination in Saccharomyces cerevisiae. We show that DNA assembler can rapidly assemble a functional d-xylose utilization pathway (∼9 kb DNA consisting of three genes), a functional zeaxanthin biosynthesis pathway (∼11 kb DNA consisting of five genes) and a functional combined d-xylose utilization and zeaxanthin biosynthesis pathway (∼19 kb consisting of eight genes) with high efficiencies (70 - 100%) …
An Explicit Method For The Packing Limit Management In Dense Gas-Solid Flow Cfd Simulations On Both Structured And Unstructured Grids, Alberto Passalacqua, Luca Marmo
An Explicit Method For The Packing Limit Management In Dense Gas-Solid Flow Cfd Simulations On Both Structured And Unstructured Grids, Alberto Passalacqua, Luca Marmo
Alberto Passalacqua
An explicit method for limiting the volume fraction of the dispersed phase in the CFD simulations of dense gas-solid flows is described and validated both on structured and unstructured computational grids. The procedure is based on the excess solids volume correction method proposed by Lettieri et al. (2003), which has been extended in this work to non-uniform grids made of cells having different shape and size. The method has been implemented in OpenFOAM and validated through the simulation of a fludised bed in which the superficial gas velocity has been reduced to a value close to zero.
Zsm-5 Coatings On β-Sic Monoliths: Possible New Structured Catalyst For The Methanol-To-Olefins Process, B. Madani, S. Ivanova, B. Louis, Jean-Philippe Tessonnier, M. J. Ledoux, C. Pham-Huu
Zsm-5 Coatings On β-Sic Monoliths: Possible New Structured Catalyst For The Methanol-To-Olefins Process, B. Madani, S. Ivanova, B. Louis, Jean-Philippe Tessonnier, M. J. Ledoux, C. Pham-Huu
Jean-Philippe Tessonnier
Structured zeolite/silicon carbide composites were succesfully synthesized by ZSM-5 coatings deposited on macroscopic â-SiC foams with medium surface area. A homogeneous coverage of the support (30 wt % zeolite) by ZSM-5 crystals, having 1 ím average size, was reached after a double-coating procedure. The ZSM-5/â-SiC composite materials were characterized by BET, XRD, SEM, and H/D exchange methods. 27Al MAS NMR analysis revealed that all aluminum was present in a tetrahedral coordination, thus sitting in the zeolite framework. The existence of a nanoscopic layer of silica and silicon oxycarbide on the surface of the support ensures the strong anchoring of the …
Quantitative Measurement Of The Brã¶Nsted Acid Sites In Solid Acids: Toward A Single-Site Design Of Mo-Modified Zsm-5 Zeolite, Jean-Philippe Tessonnier, Benoit Louis, Stephane Walspurger, Jean Sommer, Marc-Jacques Ledoux, Cuong Pham-Huu
Quantitative Measurement Of The Brã¶Nsted Acid Sites In Solid Acids: Toward A Single-Site Design Of Mo-Modified Zsm-5 Zeolite, Jean-Philippe Tessonnier, Benoit Louis, Stephane Walspurger, Jean Sommer, Marc-Jacques Ledoux, Cuong Pham-Huu
Jean-Philippe Tessonnier
On the basis of our previous H/D exchange studies devoted to the quantification of the number of Bro¨nsted acid sites in solid acids, we report here an innovative approach to determine both the amount and the localization of Mo atoms inside the Mo/ZSM-5 catalyst, commonly used for the methane dehydroaromatization reaction. The influence of Mo introduction in the MFI framework was studied by means of BET, X-ray diffraction, 27Al magic angle spinning NMR, NH3 temperature-programmed desorption, and H/D isotopic exchange techniques. A dependence was found between the decrease of acidic OH groups and the Mo content. Depending on the Si/Al …
Quantitative Elucidation Of A Distinct Spatial Gradient-Sensing Mechanism In Fibroblasts, Ian C. Schneider, Jason M. Haugh
Quantitative Elucidation Of A Distinct Spatial Gradient-Sensing Mechanism In Fibroblasts, Ian C. Schneider, Jason M. Haugh
Ian C. Schneider
Migration of eukaryotic cells toward a chemoattractant often relies on their ability to distinguish receptor-mediated signaling at different subcellular locations, a phenomenon known as spatial sensing. A prominent example that is seen during wound healing is fibroblast migration in platelet-derived growth factor (PDGF) gradients. As in the well-characterized chemotactic cells Dictyostelium discoideum and neutrophils, signaling to the cytoskeleton via the phosphoinositide 3-kinase pathway in fibroblasts is spatially polarized by a PDGF gradient; however, the sensitivity of this process and how it is regulated are unknown. Through a quantitative analysis of mathematical models and live cell total internal reflection fluorescence microscopy …
Spatial Analysis Of 3′ Phosphoinositide Signaling In Living Fibroblasts, Iii: Influence Of Cell Morphology And Morphological Polarity, Ian C. Schneider, Elizabeth M. Parrish, Jason M. Haugh
Spatial Analysis Of 3′ Phosphoinositide Signaling In Living Fibroblasts, Iii: Influence Of Cell Morphology And Morphological Polarity, Ian C. Schneider, Elizabeth M. Parrish, Jason M. Haugh
Ian C. Schneider
Activation of phosphoinositide (PI) 3-kinase is a required signaling pathway in fibroblast migration directed by platelet-derived growth factor. The pattern of 3′ PI lipids in the plasma membrane, integrating local Pl 3-kinase activity as well as 3′ PI diffusion and turnover, influences the spatiotemporal regulation of the cytoskeleton. In fibroblasts stimulated uniformly with platelet-derived growth factor, visualized using total internal reflection fluorescence microscopy, we consistently observed localized regions with significantly higher or lower 3′ PI levels than adjacent regions (hot and cold spots, respectively). A typical cell contained multiple hot spots, coinciding with apparent leading edge structures, and at most …
Elastic Waves Push Organic Fluids From Reservoir Rock, Igor A. Beresnev, R. Dennis Vigil, Wenqing Li, Wayne D. Pennington, Roger M. Turpening, Pavel P. Iassonov, Robert P. Ewing
Elastic Waves Push Organic Fluids From Reservoir Rock, Igor A. Beresnev, R. Dennis Vigil, Wenqing Li, Wayne D. Pennington, Roger M. Turpening, Pavel P. Iassonov, Robert P. Ewing
R. Dennis Vigil
Elastic waves have been observed to increase productivity of oil wells, although the reason for the vibratory mobilization of the residual organic fluids has remained unclear. Residual oil is entrapped as ganglia in pore constrictions because of resisting capillary forces. An external pressure gradient exceeding an ‘‘unplugging’’ threshold is needed to carry the ganglia through. The vibrations help overcome this resistance by adding an oscillatory inertial forcing to the external gradient; when the vibratory forcing acts along the gradient and the threshold is exceeded, instant ‘‘unplugging’’ occurs. The mobilization effect is proportional to the amplitude and inversely proportional to the …
Rational Pathway Engineering Of Type I Fatty Acid Synthase Allows The Biosynthesis Of Triacetic Acid Lactone From D-Glucose In Vivo, Wenjuan Zha, Zengyi Shao, John W. Frost, Huimin Zhao
Rational Pathway Engineering Of Type I Fatty Acid Synthase Allows The Biosynthesis Of Triacetic Acid Lactone From D-Glucose In Vivo, Wenjuan Zha, Zengyi Shao, John W. Frost, Huimin Zhao
Zengyi Shao
Metabolic pathway engineering is a powerful tool to synthesize structurally diverse and complex chemicals via genetic manipulation of multistep catalytic systems involved in cell metabolism. Here, we report the rational design of a fatty acid biosynthetic pathway, Brevibacterium ammoniagenes fatty acid synthase B (FAS-B), that allows the microbial synthesis of triacetic acid lactone (TAL) from an inexpensive feedstock, D-glucose. TAL can be chemically converted to phloroglucinol, which is a core structure for the synthesis of various high value bioactive compounds and energetic compounds such as 1,3,5-triamino-2,4,6-trinitrobenzene (TATB). Synthesis of phloroglucinol from d-glucose using this combined biological and chemical synthesis may …
Spatial Analysis Of 3′ Phosphoinositide Signaling In Living Fibroblasts: Ii. Parameter Estimates For Individual Cells From Experiments, Ian C. Schneider, Jason M. Haugh
Spatial Analysis Of 3′ Phosphoinositide Signaling In Living Fibroblasts: Ii. Parameter Estimates For Individual Cells From Experiments, Ian C. Schneider, Jason M. Haugh
Ian C. Schneider
Fibroblast migration is directed by gradients of platelet-derived growth factor (PDGF) during wound healing. As in other chemotactic systems, it has been shown recently that localized stimulation of intracellular phosphoinositide (PI) 3-kinase activity and production of 3′ PI lipids in the plasma membrane are important events in the signaling of spatially biased motility processes. In turn, 3′ PI localization depends on the effective diffusion coefficient, D, and turnover rate constant, k, of these lipids. Here we present a systematic and direct comparison of mathematical model calculations and experimental measurements to estimate the values of the effective 3′ PI diffusion coefficient, …
Beta Zeolite Supported On Silicon Carbide For Friedel–Crafts Fixed-Bed Reactions, Gauthier Wine, Joseph Matta, Jean-Philippe Tessonnier, Cuong Pham-Huu, Marc-Jacques Ledoux
Beta Zeolite Supported On Silicon Carbide For Friedel–Crafts Fixed-Bed Reactions, Gauthier Wine, Joseph Matta, Jean-Philippe Tessonnier, Cuong Pham-Huu, Marc-Jacques Ledoux
Jean-Philippe Tessonnier
Beta zeolite supported on silicon carbide, with high thermal conductivity and high mechanical strength, was successfully used as an active and stable catalyst for Friedel-Crafts reactions in a fixed bed configuration.
Beta Zeolite Supported On A Macroscopic Pre-Shaped Sic As A High Performance Catalyst For Liquid-Phase Benzoylation, G. Wine, Jean-Philippe Tessonnier, C. Pham-Huu, M. J. Ledoux
Beta Zeolite Supported On A Macroscopic Pre-Shaped Sic As A High Performance Catalyst For Liquid-Phase Benzoylation, G. Wine, Jean-Philippe Tessonnier, C. Pham-Huu, M. J. Ledoux
Jean-Philippe Tessonnier
Preparation and characterisation of a highly active and stable beta zeolite supported on a pre-shaped silicon carbide catalyst for the benzoylation reaction in liquid phase.
The Evolution Of An Introductory Biological Engineering Course: Design Is The Endpoint!, D. Raj Raman
The Evolution Of An Introductory Biological Engineering Course: Design Is The Endpoint!, D. Raj Raman
D. Raj Raman
Four the past four years, I have taught the sophomore level course, Agricultural Engineering 243 Material and Energy Flows in Biological Systems each spring semester. During the first offering, I used the lecture method to transmit information, and homework assignments and exams to reinforce skills and test comprehension. The greatest weakness of this technique seemed the lack of hands-on experience which I gave my students, and their subsequent lack of physical intuition. Enhancing their physical intuition drove the first curricular revision—using in-class demonstrations and simulations of key physical and biological processes. This technique did not work as well as expected, …
Transformation Of Tnt By Aquatic Plants And Plant Tissue Cultures, Joseph B. Hughes, Jacqueline V. Shanks, Mindy Vanderford, John Lauritzen, Rajiv Bhadra
Transformation Of Tnt By Aquatic Plants And Plant Tissue Cultures, Joseph B. Hughes, Jacqueline V. Shanks, Mindy Vanderford, John Lauritzen, Rajiv Bhadra
Jacqueline V. Shanks
The ability of plants to uptake and transform 2,4,6-trinitrotoluene (TNT) was investigated using the aquatic plant Myriophyllum spicatum, axenic Myriophyllum aquaticum, and Catharanthus roseus hairy root cultures. Studies demonstrate that Myriophyllum, with or without its periphyton, and C. roseus transform TNT. Low concentrations of aminated nitrotoluenes (2-amino-4,6- dinitrotoluene and 4-amino-2,6-dinitrotoluene) were observed in the extracellular medium and tissue extracts. Primary products of transformation were not identified, and mineralization was not observed. Mass balances demonstrate that a large percentage of the unknown TNT transformation products were associated with the plant. This fraction could be at least partially recovered from the plant …
Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Evaluation Of A Ceramic Roof Coating, William H. Allen, Jay D. Harmon, Dale E. Linvill, Matthew V. Bramblett
Jay D. Harmon
Surfaces treated with a ceramic roof coating (CRC) marketed as AZTEC No. 100 were compared to untreated and white painted surfaces. Dry-bulb and black globe temperatures in the space below or behind the surface were the criteria for comparison. Comparisons included small horizontal panels with open sides, small unvented galvanized steel and styrofoam boxes, and an open-side steel poultry building. The CRC was effective in reducing temperatures in the enclosed test boxes, but less effective with open-side test panels and the open-side steel building. Tests also indicated the CRC is characterized by high emissivity (0.95) and reflectivity (0.87). The evidence …
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Effects Of Hurricane Hugo On Agricultural Structures, Jay D. Harmon, George F. Grandle, Clyde L. Barth
Jay D. Harmon
A tour of damage to agricultural structures by hurricane Hugo was conducted. Empty grain bins which exhibited improper anchorage tended to fail. Post-frame buildings that were improperly anchored, braced or fastened failed, while others that were designed and constructed using sound engineering practices generally withstood hurricane winds.