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Showing 1 to 20 of 117 for “"PPO"”.
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Mechanism of Resistance in Common Ragweed to PPO-inhibiting Herbicides
… is known as the protoporphyrinogen oxidase (PPO, Protox) inhibiting herbicides. Only four weed species have been documented with resistance to this herbicide class. Waterhemp was the first weed species documented with PPO-resistance, which was due to a single codon deletion in a …
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Micellar structures and dynamics in aqueous solutions of PEO-PPO-PEO block copolymers
Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1999.
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Application of PEO-PPO-PEO Triblock Copolymers in Synthesis of Silica and Organosilica Nanomaterials
… oxide)-poly(ethylene oxide) (PEO-PPO-PEO), in the synthesis of mesoporous material, such as double-helical silica nanotube structures as well as bridged organosilica nanotubes by using swollen micelles of Pluronic surfactants and their mixtures. Chapter 1 introduced the background …
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Characterization of PPO-inhibitor resistance in waterhemp (Amaranthus tuberculatus) and Palmer amaranth (Amaranthus palmeri)
… and, thus, protoporphyrinogen oxidase (PPO) inhibitors were used to help control these resistant weeds. Waterhemp was the first weed species to evolve resistance to PPO inhibitors, and Palmer amaranth evolved resistance ten years later. The first known mechanism for this resistance …
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A CHARACTERIZATION OF SELECTION FOR EVOLVED RESISTANCE TO PROTOPORPHYRINOGEN OXIDASE (PPO)-INHIBITING HERBICIDES IN AMARANTHUS TUBERCULATUS
… that inhibit protoporphyrinogen oxidase (PPO; EC 1.3.3.4) activity (PPO-R). Herbicides within this site of action (WSSA site of action #14) remain efficacious when soil-applied to PPO-R waterhemp populations. Therefore, the continued use of these herbicides for soil-residual control of …
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Avoiding Protoporphyrinogen Oxidase Inhibiting Herbicide Selection Pressure on Common Ragweed and Palmer amaranth in Soybean
… oxidase inhibiting herbicides (PPO) such as flumioxazin applied preemergence (PRE) and fomesafen postemergence (POST) to control both weeds. Experiments were conducted with the overarching goal of reducing PPO selection pressure for Palmer amaranth and common ragweed. Flumioxazin …
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PEO-PPO-PEO Surfactant Mixtures as Templates for Silicas With Very Large Cylindrical Mesopores at Ambient Temperature and With Helical Mesopores at Sub-Ambient Temperature
… a much larger percentage of hydrophobic (PPO) blocks than the employed co-surfactant. Systematic adjustments of experimental parameters initially enabled the preparation of 2-D hexagonally ordered mesoporous silicas (SBA-15) of uncommonly large pore diameter at ambient temperature. …
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Multiple Herbicide Resistance in Waterhemp
… of lactofen, a protoporphyrinogen oxidase (PPO)-inhibiting herbicide. Greenhouse studies were conducted with this waterhemp biotype, and revealed that plants were also resistant to atrazine, a photosystem II (PSII)-inhibiting herbicide. A waterhemp line selected for multiple herbicide …
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Manipulation of Positive Perception of Others Through Cognitive Bias Modification
… (CBM-I) on positive perception of others (PPO). Past research has shown that there are consistent individual differences in interpersonal perception that are associated with important life outcomes including aggression and personality disorders (Wood, Harms, & Vazire, 2010). Because CBM-I …
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High-intensity interval eccentric cycling: Acute and chronic effects
… and eccentric cycling test. Peak power output (PPO) was 53% greater (PStudy 2:The same subjects as those of Study 1 performed continuous cycling at 60% of PPO for 20 min at 60 rpm, and 13.2 min at 90 rpm (CONT13@60%), 4 x 4 min intervals at 75% of PPO with 2 min rest, 12 x 1 min at 100% of PPO …
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Preferential proximal policy optimization in reinforcement learning
The Proximal Policy Optimization (PPO), a policy gradient method, excels in reinforcement learning with its ”surrogate” objective function and stochastic gradient ascent. However, PPO does not fully consider the significance of frequently encountered states in policy/value updates. To address this, …
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Synthesis and Characterization of Toughened Thermally Rearranged Polymers, Poly(2,6-Dimethylphenylene-oxide) Based Copolymers and Polymer Blends for Gas Separation Membranes
… to the homo TR polymer. Poly(phenylene oxide) (PPO) based copolymers (Chapter 4) and polymer blends (Chapter 5) were also studied for use as gas separation membranes. The polymer materials were cast into films, then crosslinked in the solid state with UV light. The ketone and benzylic methyl …
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Advanced Polymeric Membranes and Multi-Layered Films for Gas Separation and Capacitors
… to 6.2. Poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) is a commercial polymer that is utilized for gas separation membranes. It has a relatively high free volume with high gas permeabilities but suffers from low gas selectivities. In this study, PPO polymers with number average molecular weights …
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Polymerizable dopants capable of high light output and pulse shape discrimination for application in plastic scintillators
… by simply over doping 2,5-diphenyloxazole (PPO) in poly(vinyltoluene) matrices. However, over-doping PPO causes mechanical softening of the plastic, hindering its field deployment and overall widespread commercialization. It has also been observed that the dopant leaches out of the matrix …
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Enabling Synthesis Toward the Production of Biocompatible Magnetic Nanoparticles With Tailored Surface Properties
… oxide) (BzO-PEO-OH), poly(propylene oxide) (BzO-PPO-OH) and poly(ethylene oxide-b-propylene oxide) (poly(BzO-EO-b-PO-OH)) oligomeric tail blocks with varying lengths of PEO and PPO. The oligomers had a hydroxyl group at the terminal chain end and a benzyl-protected hydroxyl group at the initiated …
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A systematic study of the effect of ultrasound on food enzymes and bioactives in model and real food systems (strawberry puree)
… peroxidase (POD) and polyphenoloxidase (PPO). Thus, the present thesis examines the effect of high frequency US on the activity of commercial horseradish peroxidase (HRP), PPO in mushroom extract, and both enzymes in strawberry puree. Structural alterations of these enzymes after US …
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Effects of combined high hydrostatic pressure and dense phase carbon dioxide treatments on inactivation of enzymes, microorganisms and sensory properties of different products
… enzymes: peroxidase (POD), polyphenoloxidase (PPO) and pectinmethylesterase (PME) of feijoa, inactivation of microorganisms in their growth media and sensory properties of treated feijoa products. The changes in pure PPO secondary structure, size and inactivation kinetics were studied. Feijoa …
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Population genetics of herbicide resistance in waterhemp
… that inhibit protoporphyrinogen oxidase (PPO) have been identified throughout the Midwest and the mechanism of resistance in populations from Illinois was previously determined to result from a 3 base pair deletion in the protoporphyrinogen oxidase (PPO)-encoding gene, PPX2. The deletion …
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Exercise and lactational performance : the role of exercise intensity and the timing of an acute exercise bout
… exercise at 50 % or 70 % of peak power output (PPO). In the second experiment, these same parameters were compared after cycle ergometer exercise performed at 70% PPO immediately before a feed, 90 minutes before a feed or 180 minutes before a feed. Milk was manually expressed by the investigator …
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Synthesis and Characterization of Well-Defined Heterobifunctional Polyethers for Coating Magnetite and Their Applications in Biomedicine Resonance Imaging
… and trivinylsilyl-PEO-OH, monovinylsilyl-PEO-PPO-OH, monovinylsilyl-PEO-PPO-PEO-OH, maleimide-PEO-OH, stearyl alcohol-PEO-OH, propargyl alcohol-PEO-OH, trivinylsilyl-PPO-OH, trivinylsilyl-PPO-PEO-OH, and benzyl alcohol-initiated poly(allyl glycidyl ether)-OH. The focus of polymers utilized in …
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