Gotowe bibliografie tematyczne / DPP Derivatives

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Gotowa bibliografia na temat „DPP Derivatives”

Autor: Grafiati

Data publikacji: 6 września 2023

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Artykuły w czasopismach na temat "DPP Derivatives"

Luo, Nan, Guanxin Zhang i Zitong Liu. "Keep glowing and going: recent progress in diketopyrrolopyrrole synthesis towards organic optoelectronic materials". Organic Chemistry Frontiers 8, nr 16 (2021): 4560–81. http://dx.doi.org/10.1039/d1qo00613d.

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Recent progress in the syntheses of DPP derivatives is summarized as well as the structure–property relationships of the derivatives, including the syntheses of DPP cores, N-functionalization reactions, and π-extensions on and along the DPP cores.

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Leidel, Fabienne, Martin Eiden, Markus Geissen, Hans A. Kretzschmar, Armin Giese, Thomas Hirschberger, Paul Tavan, Hermann M. Schätzl i Martin H. Groschup. "Diphenylpyrazole-Derived Compounds Increase Survival Time of Mice after Prion Infection". Antimicrobial Agents and Chemotherapy 55, nr 10 (11.07.2011): 4774–81. http://dx.doi.org/10.1128/aac.00151-11.

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ABSTRACTTransmissible spongiform encephalopathies (TSEs) represent a group of fatal neurodegenerative disorders that can be transmitted by natural infection or inoculation. TSEs include scrapie in sheep, bovine spongiform encephalopathy (BSE) in cattle, and Creutzfeldt-Jakob disease (CJD) in humans. The emergence of a variant form of CJD (vCJD), which has been associated with BSE, produced strong pressure to search for effective treatments with new drugs. Up to now, however, TSEs have proved incurable, although many efforts have been made bothin vitroandin vivoto search for potent therapeutic and prophylactic compounds. For this purpose, we analyzed a compound library consisting of 10,000 compounds with a cell-based high-throughput screening assay dealing with scrapie-infected scrapie mouse brain and ScN2A cells and identified a new class of inhibitors consisting of 3,5-diphenylpyrazole (DPP) derivatives. The most effective DPP derivative showed half-maximal inhibition of PrPScformation at concentrations (IC50) of 0.6 and 1.2 μM, respectively. This compound was subsequently subjected to a number of animal experiments using scrapie-infected wild-type C57BL/6 and transgenic Tga20 mice. The DPP derivative induced a significant increase of incubation time both in therapeutic and prophylactic experiments. The onset of the prion disease was delayed by 37 days after intraperitoneal and 42 days after oral application, respectively. In summary, we demonstrate a highin vitroefficiency of DPP derivatives against prion infections that was substantiatedin vivofor one of these compounds. These results indicate that the novel class of DPP compounds should comprise excellent candidates for future therapeutic studies.

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He, Ran, Michael Forman, Bryan T. Mott, Rajkumar Venkatadri, Gary H. Posner i Ravit Arav-Boger. "Unique and Highly Selective Anticytomegalovirus Activities of Artemisinin-Derived Dimer Diphenyl Phosphate Stem from Combination of Dimer Unit and a Diphenyl Phosphate Moiety". Antimicrobial Agents and Chemotherapy 57, nr 9 (17.06.2013): 4208–14. http://dx.doi.org/10.1128/aac.00893-13.

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ABSTRACTWe report that the artemisinin-derived dimer diphenyl phosphate (DPP; dimer 838) is the most selective inhibitor of human cytomegalovirus (CMV) replication among a series of artemisinin-derived monomers and dimers. Dimer 838 was also unique in being an irreversible CMV inhibitor. The peroxide unit within artemisinins' chemical structures is critical to their activities, and its absence results in loss of anti-CMV activities. Surprisingly, the deoxy dimer of 838 retained modest anti-CMV activity, suggesting that the DPP moiety of dimer 838 contributes to its anti-CMV activities. DPP alone did not inhibit CMV replication, but triphenyl phosphate (TPP) had modest CMV inhibition, although its selectivity index was low. Artemisinin DPP derivatives dimer 838 and monomer diphenyl phosphate (compound 558) showed stronger CMV inhibition and a higher selectivity index than their analogs lacking the DPP unit. An add-on and removal assay revealed that removing DPP derivatives (compounds 558 and 838) but not the non-DPP backbones (artesunate and compound 606) at 24 h postinfection (hpi) already resulted in dominant CMV inhibition. CMV inhibition was fully irreversible with 838 and partially irreversible with 558, while non-DPP artemisinins were reversible inhibitors. While all artemisinin derivatives and TPP reduced the expression of the CMV immediate early 2 (IE2), UL44, and pp65 proteins at or after 48 hpi, only TPP inhibited the expression of both IE1 and IE2. Combination of a non-DPP dimer (compound 606) with TPP was synergistic in CMV inhibition, while ganciclovir and TPP were additive. Although TPP shared structural similarity with monomer DPP (compound 558) and dimer DPP (compound 838), its pattern of CMV inhibition was significantly different from the patterns of the artemisinins. These findings demonstrate that the DPP group contributes to the unique activities of compound 838.

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Wang, Yu, Xialian Tang i Lianghong Yi. "Design and Discovery of Novel 1,3,5-Triazines as Dipeptidyl Peptidase-4 Inhibitor against Diabetes". Pharmacology 103, nr 5-6 (2019): 273–81. http://dx.doi.org/10.1159/000494060.

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This study aims at synthesizing novel di-morpholine 1,3,5-triazine derivatives as antidiabetic agent via inhibition of dipeptidyl peptidase-4 (DPP-4). The molecules were developed via sequential nucleophilic reaction to afford target derivatives 5(a–f) and subsequently tested for inhibitory potency against DPP iso-enzymes, such as DPP-4, DPP-8, and DPP-9. The in vitro inhibition assay suggested that these derivatives prominently and selectively inhibit DPP-4 over DPP-8 and DPP-9. These molecules also showed no presence of cardiotoxicity, as confirmed by no activity against human Ether-à-go-go related gene channel. The study disclosed compound 5c as the most potent inhibitor of DPP-4 with IC50 of 1.10 nmol/L as compared to the standard. Compound 5c was further evaluated for oral glucose tolerance test (OGTT) and antidiabetic activity in ICR mice and Wistar rats, respectively. In OGTT, compound 5c showed dose-dependent improvement of glucose tolerance with a maximum at 30 mg/kg. It also showed reduction in area under the curve from 0 to 120 min, similar to alogliptin (standard). In Wistar rats, compound 5c causes reduction in the blood glucose level, total cholesterol, triglyceride, low density lipoprotein (LDL) and very LDL level as compared to the diabetic control group, whereas the level of high-density lipoprotein was found to be increased. Compound 5c causes improvement in antioxidant defense mechanism, as confirmed via improving superoxide dismutase, catalase, glutathione peroxidase and reducing the malondialdehyde level as compared to normal control group rats.

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Wang, Bing, Nannan He, Bo Li, Shuangying Jiang, Yi Qu, Sanyin Qu i Jianli Hua. "Aggregation-Induced Emission and Large Two-Photon Absorption Cross-Sections of Diketopyrrolopyrrole (DPP) Derivatives". Australian Journal of Chemistry 65, nr 4 (2012): 387. http://dx.doi.org/10.1071/ch11410.

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In this work, a new series of triphenylamine-based diketo-pyrrolo-pyrrole (DPP) compounds (DPP-I, DPP-II, DPP-III) have been designed and synthesized by a concise route. Their one- and two-photon absorption properties have been investigated. It was found that DPP-based compounds are very weakly fluorescent in THF solution, but their intensities are increased by almost 29, 9, and 24 times in water/THF (v/v 90 %) mixtures, respectively, in which they exhibit a strongly enhanced red fluorescence. The result indicates that the intramolecular vibration and rotation of these dyes is considerably restricted in nano-aggregates formed in water/THF mixtures, which leads to significant increases in fluorescence. The two-photon absorption (2PA) cross-sections measured by the open aperture Z-scan technique were determined to be 188, 275 and 447 GM for DPP-I, DPP-II, and DPP-III, respectively; DPP-III with the symmetrical structure shows the highest value of 2PA cross-section. The excellent properties of aggregation-induced emission (AIE) and 2PA provide an attractive alternative for the biophotonic materials.

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Wang, Lingyun, Bihong Lai, Xueguang Ran, Hao Tang i Derong Cao. "Recent Advances of Diketopyrrolopyrrole Derivatives in Cancer Therapy and Imaging Applications". Molecules 28, nr 10 (15.05.2023): 4097. http://dx.doi.org/10.3390/molecules28104097.

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Cancer is threatening the survival of human beings all over the world. Phototherapy (including photothermal therapy (PTT) and photodynamic therapy (PDT)) and bioimaging are important tools for imaging–mediated cancer theranostics. Diketopyrrolopyrrole (DPP) dyes have received more attention due to their high thermal and photochemical stability, efficient reactive oxygen species (ROS) generation and thermal effects, easy functionalization, and tunable photophysical properties. In this review, we outline the latest achievements of DPP derivatives in cancer therapy and imaging over the past three years. DPP-based conjugated polymers and small molecules for detection, bioimaging, PTT, photoacoustic imaging (PAI)-guided PTT, and PDT/PTT combination therapy are summarized. Their design principles and chemical structures are highlighted. The outlook, challenges, and future opportunities for the development of DPP derivatives are also presented, which will give a future perspective for cancer treatment.

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Yang, Sheng-Hsiung, i Chia-Hao Hsieh. "Novel Linear and Hyperbranched Polythiophene Derivatives Containing Diketopyrrolopyrroles as Linking Groups". MRS Proceedings 1771 (2015): 213–19. http://dx.doi.org/10.1557/opl.2015.497.

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ABSTRACTThe goal of this research is to synthesize novel linear and hyperbranched polythiophene derivatives containing diketopyrrolopyrrole (DPP) as linking groups, and to investigate thermal, optical, electrochemical, and photovoltaic properties of those derivatives. Polymers with high regioregularity were synthesized via the Universal Grignard metathesis polymerization. Those linear or hyperbranched polythiophenes containing DPP bridging moieties showed higher molecular weights and better thermal stability compared with normal P3HT. The UV-vis absorption spectra of the DPP-containing polymers are similar to that of P3HT in film state, while they show distinct attenuation in fluorescent emission. Finally, all polymers were blended with PC61BM and used as active layers for fabrication of inverted solar devices. The devices based on those DPP-containing polythiophenes revealed the open-circuit voltage (VOC) of 0.55–0.58 V, the short-circuit current (JSC) of 8.62–16.21 mA/cm2, the fill factor (FF) of 36–41%, and the power conversion efficiency (PCE) of 1.73–3.74%.

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Santoprete, Alessia, Elena Capitò, Paul E. Carrington, Alessandro Pocai, Marco Finotto, Annunziata Langella, Paolo Ingallinella i in. "DPP-IV-resistant, long-acting oxyntomodulin derivatives". Journal of Peptide Science 17, nr 4 (3.02.2011): 270–80. http://dx.doi.org/10.1002/psc.1328.

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Khalaf, Reema A., Dalal Masalha i Dima Sabbah. "DPP-IV Inhibitory Phenanthridines: Ligand, Structure-Based Design and Synthesis". Current Computer-Aided Drug Design 16, nr 3 (2.06.2020): 295–307. http://dx.doi.org/10.2174/1573409915666181211114743.

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Background: Lately, diabetes has become the main health concern for millions of people around the world. Dipeptidyl peptidase-IV (DPP-IV) inhibitors have emerged as a new class of oral antidiabetic agents. Formerly, acridines, N4-sulfonamido-succinamic, phthalamic, acrylic and benzoyl acetic acid derivatives, and sulfamoyl-phenyl acid esters were designed and developed as new DPP-IV inhibitors. Objective: This study aims to develop a pharmacophore model of DPP-IV inhibitors and to evaluate phenanthridines as a novel scaffold for inhibiting DPP-IV enzyme. In addition, to assess their binding interactions with the enzyme through docking in the binding site of 4A5S (PDB). Methods: Herein, Quantum–Polarized Ligand Docking (QPLD) and ligand-based pharmacophore modeling investigations were performed. Three novel 3,8-disubstituted-6-phenyl phenanthridine derivatives 3-5 have been designed, synthesized and characterized. In vitro biological testing against DPP-IV was carried out using fluorometric assay kit. Results: QPLD study demonstrates that compounds 3-5 forms H-bond with Lys554, Trp629, and Tyr631, besides charge transfer interaction between their aromatic rings and the aromatic rings of Tyr547 and Tyr666. Moreover, they fit the three pharmacophoric point features of DPP-IV inhibitors and were proven to have in vitro DPP-IV inhibitory activity where compound 5 displayed a % inhibition of 45.4 at 100 μM concentration. Conclusion: Phenanthridines may serve as a potential lead compound for developing new DPP-IV inhibitors as a promising antidiabetic agent. Computational results suggest future structural simplification.

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Ivanova, E. A., N. N. Zolotov, V. F. Pozdnev i T. A. Voronina. "Effect of cyanopyrrolidine derivatives on the activity of prolylendopeptidase, acute exudative inflammation and visceral pain in mice". Biomeditsinskaya Khimiya 66, nr 1 (styczeń 2020): 77–82. http://dx.doi.org/10.18097/pbmc20206601077.

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Cyanopyrrolidine derivatives benzyloxycarbonyl-methionyl-cyanopyrrolidine (ZMetPrdN), benzyloxycarbonylphenylalanyl- cyanopyrrolidine (ZPhePrdN), tert-butyl-hydroxycarbonyl-glycyl-cyanopyrrolidine (BocGlyPrdN), tert-butyl-hydroxycarbonyl-methionyl-cyanopyrrolidine (BocMetPrdN) are inhibitors of prolylendopeptidase (PREP; EC 3.4.21.26) with an IC50 of 2 nM to 12 nM. ZMetPrdN, ZPhePrdN and BocMetPrdN additionally inhibited dipeptidyl peptidase IV (DPP-4; EC 3.4.14.5) with an IC50 of 1100 nM to 3200 nM. All the compounds have antinociceptive properties in the acetic acid writhing test in mice. But only cyanopyrrolidine derivatives with aromatic substituents decrease exudative inflammation. The cyanopyrrolidine derivatives also increase PREP activity and compensatorily reduce DPP-4 activity in the serum of mice three hours after the induction of inflammation. Thus, cyanopyrrolidine derivatives exhibit antinociceptive and antiexudative properties in part via their effect on PREP.

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Rozprawy doktorskie na temat "DPP Derivatives"

Morton, Colin J. H. "Novel derivatives of DPP and related heterocycles". Thesis, University of St Andrews, 1999. http://hdl.handle.net/10023/15291.

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This thesis discusses the synthesis of new organic, heterocyclic materials for potential application as pigments. Chapter 1 comprises an introduction to the field of pigment and dye chemistry, discussing the rudimentary elements of colour theory, before advancing to a review of the pertinent literature regarding high performance organic pigments. In particular, the development of 1,4-diketopyrrolo[3,4-c]pyrrole (DPP) pigments is described and the central objective of synthesising alkenyl-DPPs is outlined. Chapters 2 and 3 describe synthetic efforts towards alkenyl-DPPs, employing retro Diels-Alder methodology. The reactions involving the furan-acrylonitrile adduct as the nitrile component in the standard DPP synthesis led mainly to aromatisation of the bicyclic system and the cyclopentadiene-acrylonitrile adduct failed to react altogether. The explanation for this failure has been investigated. In the course of this these studies, several DPPs incorporating a secondary alkyl substituent were prepared, not least a novel cyclohexenyl-DPP. Chapter 4 describes the use of α β-unsaturated nitriles in the standard DPP synthesis. These behaved as Michael acceptors and in the case of cinnamonitriles led to a new family of coloured materials, namely substituted 4-hydroxy-2/7- cyclopenta[c]pyrrol-1-one-5-carbonitriles. Chapter 5 describes the corresponding reaction of cinnamate esters, but in these cases bicyclic systems were not formed. The reactions are analogous to Claisen acylations and the stereochemistry of the products varied according to the substituents. Chapter 6 contains the detailed experimental work for these investigations and concludes with a portfolio of X-ray structural data.

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Ebenhoch, Bernd. "Organic solar cells : novel materials, charge transport and plasmonic studies". Thesis, University of St Andrews, 2015. http://hdl.handle.net/10023/7814.

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Organic solar cells have great potential for cost-effective and large area electricity production, but their applicability is limited by the relatively low efficiency. In this dissertation I report investigations of novel materials and the underlying principles of organic solar cells, carried out at the University of St Andrews between 2011 and 2015. Key results of this investigation: • The charge carrier mobility of organic semiconductors in the active layer of polymer solar cells has a rather small influence on the power conversion efficiency. Cooling solar cells of the polymer:fullerene blend PTB7:PC₇₁BM from room temperature to 77 K decreased the hole mobility by a factor of thousand but the device efficiency only halved. • Subphthalocyanine molecules, which are commonly used as electron donor materials in vacuum-deposited active layers of organic solar cells, can, by a slight structural modification, also be used as efficient electron acceptor materials in solution-deposited active layers. Additionally these acceptors offer, compared to standard fullerene acceptors,advantages of a stronger light absorption at the peak of the solar spectrum. • A low band-gap polymer donor material requires a careful selection of the acceptor material in order to achieve efficient charge separation and a maximum open circuit voltage. • Metal structures in nanometer-size can efficiently enhance the electric field and light absorption in organic semiconductors by plasmonic resonance. The fluorescence of a P3HT polymer film above silver nanowires, separated by PEDOT:PSS, increased by factor of two. This could be clearly assigned to an enhanced absorption as the radiative transition of P3HT was identical beside the nanowires. • The use of a processing additive in the casting solution for the active layer of organic solar cells of PTB7:PC₇₁BM strongly influences the morphology, which leads not only to an optimum of charge separation but also to optimal charge collection.

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COSOLA, ANDREA. "Multifunctional cyclodextrin derivatives for digital light processing 3D-printing". Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2959957.

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Hylton, Keisha-Gay. "Catalytic carbonylation of amines and diamines as an alternative to phosgene derivatives application to syntheses of the core structure of DMP 323 and DMP 450 and other functionalized ureas /". [Gainesville, Fla.] : University of Florida, 2004. http://purl.fcla.edu/fcla/etd/UFE0004328.

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Enkin, Nikolay [Verfasser], Marina [Akademischer Betreuer] [Gutachter] Bennati, Markus [Gutachter] Zweckstetter i Jörg [Gutachter] Enderlein. "Fullerene-Nitroxide Derivatives as Potential Polarizers for Dynamic Nuclear Polarization (DNP) in Liquid State / Nikolay Enkin ; Gutachter: Marina Bennati, Markus Zweckstetter, Jörg Enderlein ; Betreuer: Marina Bennati". Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2016. http://d-nb.info/1113875496/34.

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Jacques, Isabelle. "Découverte et déchiffrage de nouvelles voies de biosynthèse dépendant des synthases de cyclodipeptides : les clés d’une diversité accrue de dicétopipérazines potentiellement bioactives". Thesis, Paris 11, 2015. http://www.theses.fr/2015PA114838/document.

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Malgré l’intérêt et la diversité des propriétés pharmacologiques des 2,5-dicétopipérazines (DKP), les voies de biosynthèse de ces molécules d’origine microbienne sont très peu connues. L’objectif de mes travaux de thèse a été i) de documenter de nouvelles voies de biosynthèse de DKP qui se caractérisent par la présence d’une synthase de cyclodipeptides (CDPS) travaillant souvent de concert avec une ou plusieurs enzymes de modification des cyclodipeptides et ii) d’explorer la diversité chimique codée par ces voies. Dans un premier temps, je me suis intéressée aux CDPS. Après la sélection par bioinformatique de candidats dans les bases de données génomiques, j’ai pu identifier 51 nouvelles CDPS actives et montrer que ces enzymes peuvent incorporer 17 des 20 acides aminés naturels. Par ailleurs, ce travail a permis de mieux caractériser la famille des CDPS, de définir l’existence de plusieurs sous-familles aux signatures fonctionnelles spécifiques et d’établir les premiers éléments d’un code de spécificité pour la synthèse de cyclodipeptides. Dans un second temps, je me suis attachée à caractériser les enzymes de modification associées aux nouvelles CDPS et, en particulier, les dioxygénases dépendant du Fe(II) et du 2-oxoglutarate (OG) qui sont très représentées dans ces voies. J’ai ainsi pu détecter une activité in vivo pour 11 OG et poursuivre la caractérisation in vitro pour l’une de ces OG, ce qui a permis de caractériser les DKP qu’elle synthétise et d’ainsi montrer la complexité des modifications chimiques introduites. L’ensemble de ces travaux a donc permis d’identifier et de caractériser de nouvelles voies de biosynthèse qui donnent accès à une diversité accrue de DKP
Despite the interest and diversity of the pharmacological properties of 2,5-diketopiperazines (DKPs), the biosynthetic pathways of these microbial molecules are poorly documented. The aim of my doctoral work was i) to identify new DKP biosynthetic pathways that are characterized by the presence of a cyclodipeptide synthase (CDPS) often associated with one or more cyclodipeptide-tailoring enzymes and ii) to explore the chemical diversity encoded by these pathways. First of all, my study focused on CDPSs. After the bioinformatics-based selection of candidates, 51 novel CDPS were characterized, revealing the incorporation of 17 of the 20 proteinogenic amino acids. Moreover, this work has allowed a better characterization of the CDPS family, by showing the existence of several subfamilies with specific functional signatures and laying the foundations of a specificity conferring code for the synthesis of cyclodipeptides. Second, I characterized the tailoring enzymes associated with the newly identified CDPSs and, in particular, the Fe(II) and oxoglutarate dependent dioxygenases (OGs) that are highly represented in these pathways. I detected the in vivo activity for 11 OGs and characterized the in vitro activity for one of them, showing the complexity of the chemical modifications introduced into the cyclodipeptide. This work has led to identify and characterize novel biosynthetic pathways that provide access to a greater diversity of DKPs

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Zinck, Guillaume. "Reconstruction d'hypersurfaces de champs de normales sous contraintes : application à l'analyse stratigraphique des images sismiques". Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14705/document.

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Cette thèse traite de la reconstruction d'hypersurfaces au sein de champs de normales en dimension quelconque et trouve des applications dans l’analyse des empreintes digitales (lignes dermiques), des images satellites météorologiques (lieux de turbulence) et astrophysiques (bras de galaxies) ainsi que dans l’analyse stratigraphique des images sismiques (horizons). Les méthodes développées s’appuient sur la minimisation d’une équation aux dérivées partielles non linéaire reliant une hypersurface au pendage déduit d’un champ de normales. Elles prennent en compte des contraintes diverses telles que des points de passages, des frontières, des bornes et des discontinuités. La contribution principale de la thèse réside dans l’introduction d’un changement d’espace du pendage qui permet de reconstruire aussi bien des hypersurfaces exprimées sous des formes implicites dans les repères de définition des champs de normales que des horizons sismiques de manière rapide et interactive. Deux schémas de reconstruction d’horizons sismiques unidimensionnels présentant une discontinuité d’amplitude et de lieu inconnus sont également proposés
This thesis deals with the reconstruction of hypersurfaces from a finite-dimensional normal vector field. Application scopes can be found in the analysis of fingerprints (epidermal ridges), meteorological images (eddies and cyclones), astrophysical images (galaxy arms) and in the stratigraphic analysis of seismic images (horizons). The hypersurfaces are obtained by solving a non-linear partial derivative equation relied on the local dip deduced from a normal vector field. Several constraints such as boundaries, bounds, points belonging to the hypersurface or discontinuities can be considered.The major contribution of this thesis consists in a local dip transformation which allows to reconstruct implicit hypersurfaces as well as seismic horizons by a fast and interactive method. Two schemes dedicated to the reconstruction of discontinuous one-dimensional seismic horizons are also proposed when the discontinuity location and jump are unknown

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Syu, Li-Kun, i 許禮焜. "The study of derivatives and intermediates in the DPG powders". Thesis, 2006. http://ndltd.ncl.edu.tw/handle/44477597689626547071.

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碩士
國立臺灣大學
材料科學與工程學研究所
95
The DPG powders manufactured in the experiment was applied to the anode material for lithium ion secondary battery, and the capacity of the battery was good. The reversible capacity of DPG powders was over 400 mA/g , even higher than the theoretical value 372mAh/g. However, the irreversibility of the battery reached 30%.In the HBr rinsed DPG powders, we found one different diffraction peak in the XRD pattern. The conception of experiments was finding out the possible structure of the derivatives. At the same time, we calculated the content of the derivative in the DPG powders. Finally, we compared the results of the DPG powders which was manufactured with the different concentration of HBr we used SEM(scanning electron microscopy) to observe the changes on the surface, and used XRD(X-ray diffraction) and EDX(energy dispersive spectrometer) to carry out qualitative analysis, and then decided the possible structure of the derivatives. In the end, we used Rietveld Method to estimate the content of the different derivatives in the DPG powders. Results from the experiment indicated that there were at least three different kinds of components in the DPG powders: Hexagonal Graphite, Orthorhombic Carbon, Iron Oxide(Fe2O3). Meanwhile, the content of the three kinds of the derivatives changed with the concentration of HBr and used. We found that content of the Hexagonal Graphite increased with the concentration of HBr we used. However, the content of the Orthorhombic Carbon decreased with the concentration of HBr we used. It indicated that the Orthorhombic Carbon was more reactive with HBr than the Hexagonal Graphite for the poor crystallinity.

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Enkin, Nikolay. "Fullerene-Nitroxide Derivatives as Potential Polarizers for Dynamic Nuclear Polarization (DNP) in Liquid State". Doctoral thesis, 2015. http://hdl.handle.net/11858/00-1735-0000-0028-882E-8.

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馬瑞奇. "Synthesis of Naphthalimide Derivative and Diketopyrrolopyrrole (DPP)-Based [2]Rotaxane/Polyrotaxane as Novel Chemosensor Materials and a Controllable Hierarchical Nano Self-Assembled Structure from Polyrotaxane". Thesis, 2013. http://ndltd.ncl.edu.tw/handle/07354602595689667348.

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博士
國立交通大學
材料科學與工程學系所
102
I Abstract Synthesis of Naphthalimide Derivative and Diketopyrrolopyrrole (DPP)-Based [2]Rotaxane/Polyrotaxane as Novel Chemosensor Materials and a Controllable Hierarchical Nano Self-Assembled Structure from Polyrotaxane Student: M. V. P. S. K. R. Raju Advisor: Hong-Cheu, Lin The pivotal objective of this dissertation is to construct novel orthogonally H-bonded mechanically interlocked molecular/polyrotaxane architectures with an asymmetric (Diketopyrrolopyrrole) stopper and to study their molecular shuttling process under solvent, anion, and acid-base stimuli control along with their controllable hierarchical nanostructure formations plugged with positive cooperativity non-covalent interactions. In the introduction of this doctoral thesis we have introduced brief early synthetic attempts to create mechanically interlocked molecules (MIMs) such as rotaxanes and catenanes as well as their polymeric counterparts. Moreover novel templating methodologies to build MIMs and some latest examples of MIMs based molecular shuttles under various stimuli control were also introduced. Fundamentally, underplayed chemo sensing mechanisms in these systems were presented. Meanwhile, we have developed a novel and facile fluorescent ratiometric chemodosimeter for grisly toxic hydrazine via mild Ing-Manske phthalimide deprotection method in this doctoral thesis as well. In chapter two, a novel [2]rotaxane based on an orthogonal H-bonded motif and 3,6-di(thiophenyl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione (DPP) with controlled topicity was successfully constructed, displaying excellent stimulated responses toward anion and solvent polarity. The extensive 1H &; 19F NMR titrations were lucidly revealed the binding site and the mode binding interaction as well. The preorganized host selectively recognized F- with high optical sensitivity and reversibility via enhanced positive cooperativity and noncovalent interaction by evidence of a shorter fluorescence lifetime. Therefore we developed a first prototype [2]rotaxane molecular shuttle for selective recognition of F- with high optical outputs. II In chapter three, four analogous polymers were systematically synthesized by copolymerization of a 9-alkylidene-9H-fluorene monomer with various monomers, which contained a diketopyrrolopyrrole unit tethered with a dumbbell unit, a metalated [2]rotaxane, a demetalated orthogonal H-bonded [2]rotaxane, and a simple alkyl chain, to furnish P1, P2, P3, and P4, respectively, to investigate the supramolecular interactions of the mechanically interlocked rotaxane pendants and conjugated polymer backbones. Prevailing 1H NMR and UV-vis to NIR titration profiles indicated that the novel polyrotaxane P3 showed a sensitive and reversible acid-base molecular switch capability via supramolecular interactions in contrast to the other polymers (P1, P2, and P3). Compared with the other polymers, P3 possessed a narrower bandgap, which was also confirmed by the computational study. Prominently, the monitoring of a controllable nano-self-assembly process of P3 was obtained by reversible acid-base molecular switch approaches. The orthogonal H-bonded pendant [2]rotaxane unit and the steric demand of P3 judiciously allowed to morph into a hierarchical nanostructure via interconvertible H-bonds, anion-π and π-π stackings, as well as hydrophobic interactions. In chapter four, A facile and sensitive fluorescent probe for hydrazine based on phthalimide appended hydrophilic naphthalimide was successfully constructed, displaying excellent colorimetric and ratiometric responses towards hydrazine via Ing-Manske phthalimide deprotection conditions in semi-aqueous buffer solution. The estimated detection limit was as low as 4.2 nM (hydrazine content = 1 ppb) far below than the threshhold limit value (TLV) of 10 ppb according to the U. S. Environmental Protection Agency (EPA). Prevailing detection of hydrazine in living cells of the current probe is demonstrated. Thus in conclusion, a novel archetype DPP based highly fluorescent [2]rotaxane was developed. The remarkable stimulated responses towards solvent polarity and fluoride ion were discussed. Moreover, the extended efforts of this current design into polyrotaxane architectures along with their acid-base controllable hierarchical nanostructure formations via reversible optical molecular switch approaches coupled with various non-covalent interactions were discussed. Furthermore a novel fluorescent ratiometric chemodosimeter for hydrazine based on Ing-Manske phthalimide deprotection was presented in detail.

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Książki na temat "DPP Derivatives"

World Health Organization (WHO). The use of Artemisinin and its derivatives as ant-malarial drugs: Report of a Joint CTD/DMP/TDR Informal Consultation. Geneva: World Health Organization, 1998.

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Części książek na temat "DPP Derivatives"

Yamada, Takashi, Masayuki Nakao, Takashi Yanagi, Toshifumi Miyazawa, Shigeru Kuwata, Makiko Sugiura, Yasuko In i Toshimasa Ishida. "Conformational studies of Dnp-pNA derivatives of tetrapeptide diastereomers containing α,α-disubstituted glycines". W Peptides 1992, 501–2. Dordrecht: Springer Netherlands, 1993. http://dx.doi.org/10.1007/978-94-011-1470-7_222.

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Bolocan, Natalia, i Gheorghe Duca. "Dihydroxyfumaric Acid". W Fundamental and Biomedical Aspects of Redox Processes, 198–223. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-7198-2.ch009.

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This chapter presents a review of the research that was conducted on a natural antioxidant - dihydroxyfumaric acid in the frames of the laboratory of physical and quantum chemistry. The structure and chemistry of dihydroxyfumaric acid are presented in view of its importance in biological cycles, as well as in prebiotic chemistry models. Technological applications are briefly reviewed for wine, food, and tobacco industries. Organic syntheses of new derivatives are presented, and their calculated antioxidant/antiradical activities towards the DPPH and ABTS radicals are discussed. Computational chemistry techniques are employed to gain insights into the isomerism and tautomerism of dihydroxyfumaric acid, and indices of global and local reactivity are calculated for the acid and its new derivatives, in order to theoretically explain the experimental results.

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Cardaliaguet, Pierre, François Delarue, Jean-Michel Lasry i Pierre-Louis Lions. "Convergence of the Nash System". W The Master Equation and the Convergence Problem in Mean Field Games, 159–74. Princeton University Press, 2019. http://dx.doi.org/10.23943/princeton/9780691190716.003.0006.

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This chapter talks about addressing the convergence problem, which is devoted to the convergence of the Nash system. It contains several results on the differential calculus on the space of probability measures together with an Itô's formula for functionals of a process taking values in the space of probability measures. For simplicity, most of the analysis provided in the chapter is on the torus, but the method is robust enough to accommodate the nonperiodic setting. The chapter also shows that monotonicity plays no role in the proofs of certain theorems. Basically, only the global Lipschitz properties of H and DpH, together with the nondegeneracy of the diffusions and the various bounds obtained for the solution of the master equation and its derivatives matter.

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Gharaee, Hossein, Abdolreza Nabavi i Jalil ("Joe") Etminan. "Performance and Complexity Evaluation of OTR-UWB Receiver". W Networking and Telecommunications, 1945–58. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-60566-986-1.ch123.

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This article presents a new transmitted reference UWB receiver, which utilizes the orthogonal property of even and odd order derivatives of Gaussian pulses in neighboring chips for synchronization. This system, referred to as orthogonal TR-UWB (OTR-UWB), employs only a single spreading code, which results in much lower mean detection time compared to DS-UWB systems. The hardware complexity for OTR-UWB receiver is significantly reduced against conventional TR-UWB systems. In addition, simulation results show that BER performance is improved, while the new system is capable of supporting higher data rates. Also, this article presents the FPGA implementation of OTR-UWB, with a bit-rate of 25Mb/s without using equalizer. In addition, we present the DSP algorithm of baseband. Hardware of this system is implemented on two different FPGAs from ALTERA and XILINX, CycloneII (EP2C35F672C6) and Spartan 3 (3s4000fg676-5). Gate estimation and power analysis are performed by Quartus II 7.2 (ALTERA) and ISE 8.1 (XILINX) softwares.

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Duraipandy, Jeyabharathi, Sherly Alphonse A., Sasireka D. i Kesavaraja D. "Smart ATM With Tracking of Criminals Using Novel Di-Pattern and C-LDP (Combined Local Directional Pattern)". W Advances in Business Information Systems and Analytics, 183–200. IGI Global, 2023. http://dx.doi.org/10.4018/978-1-6684-7105-0.ch010.

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Automated teller machine (ATM) surveillance system is a smart system based on image processing that incorporates various sensors and machine learning algorithms to continuously monitor its surroundings for suspicious activities like physical attack. To prevent these attacks, there is a need to find the criminal immediately and save the person's life. In this chapter, two ways are followed to detect the criminals. The first one is weapon detection; the second one is criminal facial identification. A novel magnitude-based feature extraction technique creates the magnitude pattern for the image using Di-Pattern (DiP). Di-Pattern utilizes both horizontal and vertical derivatives to create a unique feature vector of the objects. Based on thresholding, weapons are detected. Once weapon detection as well as facial identification is done, it gives the alert. This system makes its effective usage in the remote locations where threatening is more, thus providing security. The proposed method achieves better accuracy than the other existing methods.

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Zaier, Rania, i Sahbi Ayachi. "Computational Study on Optoelectronic Properties of Donor-Acceptor Type Small π-Conjugated Molecules for Organic Light-Emitting Diodes (OLEDs) and Nonlinear Optical (NLO) Applications". W Density Functional Theory - Recent Advances, New Perspectives and Applications. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.98590.

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Recently, donor-acceptor type molecule that contains electron-rich (D) and electron-deficient (A) moiety has emerged as an interesting approach of molecular design strategy to develop organic light-emitting diodes (OLEDs) and non-linear optical (NLO) devices. In this work, we report a theoretical investigation based on two donor-acceptor (D-A) type small π-conjugated molecules based on dithieno [3,2-b: 2′,3′-d] pyrrole (DTP) and anthracene derivatives. All of the theoretical calculations were performed by Density Functional Theory (DFT) approach at B3LYP/6-31 g(d) level of theory. The structural, electronic, optical and charge transfer properties were investigated. The effect of acceptor blocks (DPA and DTA) on the molecular characteristics was elucidated. The obtained results clearly show that the studied compounds exhibit non-coplanar structures with low electronic band gap values. These relevant structures exhibited important optical absorption and intense emission in the green-yellow region. NLO investigation based on static polarizability (α0), first-order hyperpolarizability (β0) and second-order hyperpolazabilty (ɣ0) demonstrated that the studied materials exhibit excellent NLO properties. Thus, the designed materials showed promising capabilities to be utilized in OLED and NLO applications.

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Streszczenia konferencji na temat "DPP Derivatives"

Ji, Yu, Wenshu Yu, Xingzhou Yang, Xiaodong Liu i Yonghao Zheng. "Effect of heteroatom substitution on the single-molecule conductance of DPP derivatives". W Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022), redaktorzy Thanikaivelan Palanisamy i Lim Boon Han. SPIE, 2023. http://dx.doi.org/10.1117/12.2672956.

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Šaćirović, Sabina, Andrija Ćirić, Mališa Antić i Zoran Marković. "HPLC ANALYSIS OF PHENOLS OF SLOVENIAN RED WINES: CABERNET SAUVIGNON AND MERLOT". W 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.165s.

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In this study, HPLC-DAD rapid analysis of phenols in wine samples was performed. The recording was performed at different wavelengths: phenolic acid (254nm), flavan-3-ols and stilbene (280nm), flavonoids (340nm) and anthocyanins (520nm). In selected wines, the concentrations of the following compounds were determined and expressed in mg/l of wine. The isolated derivatives were: hydroxybenzoic acids, derivatives of caffeic, ferulic, syringic, and vanillic acids, catechin (flavanol), rutin, myricetin and quercetin (flavonols), and the stilbene derivative-resveratrol. The properties and quantities of phenolic compounds in organic wines were investigated. The results show the content of phenolic compounds in organic wines do not differ qualitatively and quantitatively from those in conventional wines. Wine samples have shown good antioxidative activity according to both DPPH and FRAP analysis, which indicates the good antioxidative potential and high antioxidant concentration in tested wines. Cabernet Sauvignon wines have shown better radical scavenging activity than Merlot, especially when the DPPH test was considered.

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Zhang, Yi-liang, Rui-bin Gou, Ji-min Li, Gong-tian Shen i Jing Wang. "Experimental Study on Critical Derivative of Cracking Magnetic Field Intensity in High Frequency Fatigue Test". W ASME 2010 Pressure Vessels and Piping Division/K-PVP Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/pvp2010-25531.

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This paper focuses on engineering application of metal magnetic memory (MMM) method. High-cycle fatigue test were applied to a large number of defect-free samples, and MMM signals were captured before fatigue fracturing. A concept of critical magnetic intensity (Hp) derivative (dHp/dx) of cracking was proposed. To study the characteristics of Hp and its derivative (dHp/dx) during cracking, fatigue test were applied to a total number of 50 pieces of Q235, 16MnR and base metal and welded specimens. In different fatigue periods, MMM signals were tested and microscopic metallographic were observed, so as to quantitatively analyze Hp and dHp/dx from both macro and micro angles. The results show that various materials differ in their critical dHp/dx limit, which could be the fatigue crack initiation time. It thus proves that MMM has special efficiency in the diagnosis of premature defects and stress concentration of metal structures.

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Muškinja, Jovana M., Jelena S. Katanić Stanković i Zoran R. Ratković. "SYNTHESIS AND ANTIOXIDANT ACTIVITY OF SOME NEW SULFONAMIDE DERIVATIVES". W 1st INTERNATIONAL Conference on Chemo and BioInformatics. Institute for Information Technologies, University of Kragujevac, 2021. http://dx.doi.org/10.46793/iccbi21.351m.

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Sulfonamide derivatives are a very important class of compounds with pronounced biological activities and, for this reason, they have very useful pharmaceutical applications. They are the basis of several groups of drugs and are known as sulfa-drugs. From this point of view, the present study focuses on the synthesis of some novel structural hybrids incorporating two very important groups, sulfonamide, and pyrazoline. The new sulfonamide-based pyrazolines were synthesized in very good yields. The structures of the sulfonamide compounds were confirmed by IR and NMR methods. Synthesized compounds were tested for their antioxidant activities using two different methods, DPPH radical and ABTS radical cation scavenging assays. The results showed relatively good in vitro antioxidant activity.

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Celichowski, G., i K. Chrobak. "Improving of Tribological Properties of Nanocomposites Sol-Gel Thin Films by Fluorocyclophosphazene Derivatives". W World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64261.

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Fluorocyclophospazenes’ derivatives were used as modifiers for improving tribological properties of thin films prepared by sol-gel technique. Thin films were made on the base of aminopropyltriethoxysilane (APTS). All films were deposited by dip-coating method and post-treated by heat, UV radiation and low pressure of RF plasma. Chemical changes in sol-gel films during all steps of post-treatments and modifications were monitored by FT-IR spectroscopy and SIMS spectrometry. Topographies of modified surfaces were imaged by Atomic Force Microscopy (AFM). After final modification significant improvements of frictional properties were observed as well as their very good thermal stability.

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Singh, Gagandeep, Rahul Mahadik, William K. Mohanty i Aurobinda Routray. "Analytic directional derivative based gradient structure-tensor-based dip to detect seismic faults". W Second International Meeting for Applied Geoscience & Energy. Society of Exploration Geophysicists and American Association of Petroleum Geologists, 2022. http://dx.doi.org/10.1190/image2022-3751246.1.

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Agrawal, N., A. Kumar i Varun Bajaj. "Phase Optimization based Design of Infinite Impulse Response Filter using Fractional Derivative". W 2018 IEEE 23rd International Conference on Digital Signal Processing (DSP). IEEE, 2018. http://dx.doi.org/10.1109/icdsp.2018.8631587.

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Mourad, D., E. H. S. Eldin i A. M. Abd-Elaziz. "Novel unit protective relaying techniques for teed circuit based on sequential overlapping derivative transform". W 11th IET International Conference on Developments in Power Systems Protection (DPSP 2012). IET, 2012. http://dx.doi.org/10.1049/cp.2012.0021.

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Shy, Jow-Tsong, Che-Chung Chou, Chern-Yn Shieh, Jin-Dong Chern i Tsu-Chiang Yen. "Frequency stabilization and measurement of the sequence-band CO2 laser". W OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.thj6.

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The sequence bands of the CO2 laser, which can be generated by placing a hot CO2 cell inside a CO2 laser cavity, provide a considerable increased number of laser lines with sufficient power to pump FIR lasers and for molecular spectroscopy. Shy and Yen have been able to lock a sequence-band laser to the line center using the optogalvanic Lamb dip with a low pressure N2-CO2 dc discharge.1 In this paper, we report two new line-center frequency stabilization methods for the sequence-band CO2 laser. For the first method, which we call rf optogalvanic Lamb dip, the dc discharge is replaced by an rf discharge. This method has certain advantages over the dc optogalvanic Lamb dip: lower pressure, lower operation voltage, no need of water cooling, and better SNR. The second method, saturated 4.3-µm fluorescence, utilizes the fact that the 4.3-µm fluorescence originating from the upper level of the sequence bands does not have the photon trapping effect. We use a longitudinal cell to collect the fluorescence. The cell is a Pyrex tube with inside coated with Al. By heating part of the cell to ~200°C, we were able to observe the saturation dip in the fluorescence signal and use its derivative signal to stabilize the laser. The stability is >100 kHz for both methods. Finally, we measured the beat frequency between a sequence-band laser stabilized by rf optogalvanic Lamb dip and a frequency stabilized regular CO2 laser, and nineteen sequence transition frequencies have been measured to an accuracy of 300 kHz.

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Al-Dabooni, Seaar, Alaa Azeez Tawiq i Hussen Alshehab. "Dual Heuristic Dynamic Programming in the Oil and Gas Industry for Trajectory Tracking Control". W SPE Conference at Oman Petroleum & Energy Show. SPE, 2022. http://dx.doi.org/10.2118/200271-ms.

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Abstract This paper presents the state-of-the-art of the artificial intelligence algorithm, named dual heuristic dynamic programming (DHP) that uses to solve the petroleum optimization-control problems. Fast self-learning control based on DHP is illustrated for trajectory tracking levels on a quadruple tank system (QTS), which consists of four tanks and two electrical-pumps with two pressure control valves. Two artificial neural networks are constructed the DHP approach, which are the critic network (the provider of a critique/evaluated signals) and the actor-network or controller (the provider of control signals). DHP controller is learnt without human intervention via repeating the interaction between an equipment and environment/process. In other words, the equipment receives the system states of the process via sensors, and the algorithm maximizes the reward by selecting the correct optimal action (control signal) to feed the equipment. The simulation results are shown for applying DHP with QTS as a benchmark test problem by using MATLAB. QTS is taken in the paper because QTS is widely used in the most petroleum exploration/production fields as entire system or parts. The second reason for using QTS as a test problem is QTS has a difficult model to control, which has a limited zone of operating parameters to be stable. Multi-input-multi-output (MIMO) model of QTS is a similar model with most MIMO devises in the oil and gas field. The overall learning control system performance is tested and compared with a heuristic dynamic programming (HDP) and a well-known industrial controller, which is a proportional integral derivative (PID) by using MATLAB programming. The simulation results of DHP provide enhanced performance compared with the PID approach with 98.9002 % improvement. Furthermore, DHP is faster than HDP, whereas DHP needs 6 iterations, while HDP requires 652 iterations to stabilize the system at minimum error. Because of most equipment in the oil and gas industry has programmable logic control (PLC), the neural network block has already existed in the toolbox of the PLC program. Therefore, this project can apply in real by installing PLC to any equipment with DHP toolbox that connects to the sensors and actuators. At the first time, the DHP toolbox in PLC is learnt by itself to build a suitable robust controller. Then, the DHP controller is used during normal situations, while if any hard events happen to the equipment (the PID controller cannot handle it), the DHP toolbox starts learning from scratch again to overcome the new situations.

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