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Academic literature on the topic 'DPPZ'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "DPPZ"

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Choy, Tak-Kee, Chih-Yang Wang, Nam Nhut Phan, Hoang Dang Khoa Ta, Gangga Anuraga, Yen-Hsi Liu, Yung-Fu Wu, Kuen-Haur Lee, Jian-Ying Chuang, and Tzu-Jen Kao. "Identification of Dipeptidyl Peptidase (DPP) Family Genes in Clinical Breast Cancer Patients via an Integrated Bioinformatics Approach." Diagnostics 11, no. 7 (July 2, 2021): 1204. http://dx.doi.org/10.3390/diagnostics11071204.

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Breast cancer is a heterogeneous disease involving complex interactions of biological processes; thus, it is important to develop therapeutic biomarkers for treatment. Members of the dipeptidyl peptidase (DPP) family are metalloproteases that specifically cleave dipeptides. This family comprises seven members, including DPP3, DPP4, DPP6, DPP7, DPP8, DPP9, and DPP10; however, information on the involvement of DPPs in breast cancer is lacking in the literature. As such, we aimed to study their roles in this cancerous disease using publicly available databases such as cBioportal, Oncomine, and Kaplan–Meier Plotter. These databases comprise comprehensive high-throughput transcriptomic profiles of breast cancer across multiple datasets. Furthermore, together with investigating the messenger RNA expression levels of these genes, we also aimed to correlate these expression levels with breast cancer patient survival. The results showed that DPP3 and DPP9 had significantly high expression profiles in breast cancer tissues relative to normal breast tissues. High expression levels of DPP3 and DPP4 were associated with poor survival of breast cancer patients, whereas high expression levels of DPP6, DPP7, DPP8, and DPP9 were associated with good prognoses. Additionally, positive correlations were also revealed of DPP family genes with the cell cycle, transforming growth factor (TGF)-beta, kappa-type opioid receptor, and immune response signaling, such as interleukin (IL)-4, IL6, IL-17, tumor necrosis factor (TNF), and interferon (IFN)-alpha/beta. Collectively, DPP family members, especially DPP3, may serve as essential prognostic biomarkers in breast cancer.
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Funston, Alison M., Carleen Cullinane, Kenneth P. Ghiggino, W. David McFadyen, Stanley S. Stylli, and Peter A. Tregloan. "Dipyridophenazine Complexes of Cobalt(III): DNA Photocleavage and Photobiology." Australian Journal of Chemistry 58, no. 3 (2005): 206. http://dx.doi.org/10.1071/ch04206.

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The UV-visible spectroscopy and photochemistry of [Co(en)2(DPPZ)](ClO4)3 (DPPZ = dipyrido[3,2-a:2´,3´-c]-phenazine) in the presence of plasmid DNA and the nucleoside 2´-deoxygaunosine have been investigated. Evidence for the intercalation of the complex with DNA and photoinduced DNA strand breakage is found. The structurally related complexes [Co(en)2(DPPN)]Cl3 and [Co(en)2(DPPA)]Cl2, where DPPN = benzo[i]dipyrido[3,2-a:2´,3´-c]phenazine and DPPA = dipyrido[3,2-a:2´,3´-c] phenazine-11-carboxylic acid, have also been synthesized and characterized. In vitro cytotoxicity studies and photocytotoxicity studies of the complexes using the C6 rat glioma cell line are reported and indicate significant increases in toxicity following irradation.
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QI, Shu Y., Pierre J. RIVIERE, Jerzy TROJNAR, Jean-Louis JUNIEN, and Karen O. AKINSANYA. "Cloning and characterization of dipeptidyl peptidase 10, a new member of an emerging subgroup of serine proteases." Biochemical Journal 373, no. 1 (July 1, 2003): 179–89. http://dx.doi.org/10.1042/bj20021914.

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Two dipeptidyl peptidase IV (DPPIV, DPP4)-related proteins, DPP8 and DPP9, have been identified recently [Abbott, Yu, Woollatt, Sutherland, McCaughan, and Gorrell (2000) Eur. J. Biochem. 267, 6140–6150; Olsen and Wagtmann (2002) Gene 299, 185–193; Qi, Akinsanya, Riviere, and Junien (2002) Patent application WO0231134]. In the present study, we describe the cloning of DPP10, a novel 796-amino-acid protein, with significant sequence identity to DPP4 (32%) and DPP6 (51%) respectively. We propose that DPP10 is a new member of the S9B serine proteases subfamily. The DPP10 gene is located on the long arm of chromosome 2 (2q12.3-2q14.2), close to the DPP4 (2q24.3) and FAP (2q23) genes. The active-site serine residue is replaced by a glycine residue in DPP10, resulting in the loss of DPP activity. The serine residue is also replaced in DPP6, which lacks peptidase activity. DPP8 and DPP9 share an identical active site with DPP4 (Gly-Trp-Ser-Tyr-Gly). In contrast with the previous results suggesting that DPP9 is inactive, we show that DPP9 is a DPP, hydrolysing Ala-Pro-(7-amino-4-methyl-coumarin) with similar pH-specificity and protease-inhibitor-sensitivity to those of DPP4 and DPP8. Northern-blot analysis shows that whereas DPP8 and DPP9 are widely expressed, DPP10 is expressed mainly in the brain and pancreas. DPP6, which has the highest amino acid identity with DPP10, has been shown previously [Nadal, Ozaita, Amarillo, de Miera, Ma, Mo, Goldberg, Misumi, Ikehara, Neubert et al. (2003) Neuron 37, 449–461] to associate with A-type K+ channel subunits, modulating their transport and function in somatodendritic compartments of neurons. It is possible that DPP10 is involved in similar functions in the brain. Elucidation of the physiological or pathophysiological role of DPP8, DPP9 and DPP10 and characterization of their structure–function relationships will add impetus to the development of inhibitor molecules for pharmacological or therapeutic use.
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Al-Samrai, Osama'a A. Y., Ahmed S. M. Al-Janabi2, and Eman A. Othman1. "Mixed Ligand Complexes of Hg-tetrazole-thiolate with phosphine, Synthesis and spectroscopic studies." Tikrit Journal of Pure Science 24, no. 5 (September 13, 2019): 10. http://dx.doi.org/10.25130/j.v24i5.860.

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Seven new complexes [Hg(k1-ptt)2](1), [Hg(k1-ptt)2(dppm)](2), [Hg(k1-ptt)2(dppe)](3), [Hg(k1-ptt)2(dppp)](4), [Hg(k1-ptt)2(dppb)](5), [Hg(k1-ptt)2(dppf)] (6), and [Hg(k1-ptt)2(PPh3)2] (7) have been synthesized and characterized. The reaction of two moles equivalent of 1-Phenyl-1H-tetrazole-5-thiol (Hptt) with one mole equivalent of Hg(oAc)2.xH2O in ethanol solution afford [Hg(k1-ptt)2] (1). Treatment of (1) with one mole equivalent of diphos (diphos : dppm, dppe, dppp, dppb, dppf) or two moles equivalent of PPh3 afforded a complexes of the types [Hg(k1-ptt)2(diphos)] (2-6) or [Hg(k1-ptt)2(PPh3)2] (7). The prepared complexes have been characterized by CHNS elemental analyses, molar conductivity, IR and NMR (1H, 13C and 31P) spectroscopy. In all complexes, the ptt- ligand is bonded through the sulfur atom of deprotonated thiol group, whereas the diphosphine ligands bonded as bidentate chelating and PPh3 bonded as a monodentate, to afford a tetrahedral geometry around the Hg+2 ion. http://dx.doi.org/10.25130/tjps.24.2019.083
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Wilson, Claire H., Hui Emma Zhang, Mark D. Gorrell, and Catherine A. Abbott. "Dipeptidyl peptidase 9 substrates and their discovery: current progress and the application of mass spectrometry-based approaches." Biological Chemistry 397, no. 9 (September 1, 2016): 837–56. http://dx.doi.org/10.1515/hsz-2016-0174.

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Abstract The enzyme members of the dipeptidyl peptidase 4 (DPP4) gene family have the very unusual capacity to cleave the post-proline bond to release dipeptides from the N-terminus of peptide/protein substrates. DPP4 and related enzymes are current and potential therapeutic targets in the treatment of type II diabetes, inflammatory conditions and cancer. Despite this, the precise biological function of individual dipeptidyl peptidases (DPPs), other than DPP4, and knowledge of their in vivo substrates remains largely unknown. For many years, identification of physiological DPP substrates has been difficult due to limitations in the available tools. Now, with advances in mass spectrometry based approaches, we can discover DPP substrates on a system wide-scale. Application of these approaches has helped reveal some of the in vivo natural substrates of DPP8 and DPP9 and their unique biological roles. In this review, we provide a general overview of some tools and approaches available for protease substrate discovery and their applicability to the DPPs with a specific focus on DPP9 substrates. This review provides comment upon potential approaches for future substrate elucidation.
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Liang, Xi-Ling, and Li-Feng Tan. "Nucleic Acid (Calf Thymus-DNA, Yeast tRNA) Binding and Cytotoxic Properties of a Dinuclear (Ru,Co) Metal Polypyridyl Complex." Australian Journal of Chemistry 63, no. 10 (2010): 1453. http://dx.doi.org/10.1071/ch10178.

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Based on [L2Ru{DPPZ(11–11′)DPPZ}RuL2]4+ (where L = 1,10-phenanthroline or 2,2′-bipyridyl, DPPZ(11–11′)DPPZ = 11,11′-bi(dipyrido-[3,2-a:2′,3′-c]-phenazinyl)), a heterodinuclear (Ru,Co) metal polypyridyl complex [(phen)2Ru{DPPZ(11–11′)DPPZ}Co(phen)2]5+ (phen = 1,10-phenanthroline) has been designed and synthesized. A comparative study on the interaction of the complex with calf thymus DNA and yeast tRNA was investigated by UV-visible spectroscopy, fluorescence spectroscopy and viscosity measurements, as well as equilibrium dialysis and circular dichroism. The antitumour activities of the complex were evaluated by the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetraazolium bromide method and Giemsa staining experiment. These results indicate that the configuration and structures of nucleic acids have significant effects on the binding behaviours of metal complexes. Furthermore, the complex shows different antitumour activities against selected tumour cell lines, and can cause cell apoptosis.
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Di Pietro, Maria Letizia, Giuseppina La Ganga, Francesco Nastasi, and Fausto Puntoriero. "Ru(II)-Dppz Derivatives and Their Interactions with DNA: Thirty Years and Counting." Applied Sciences 11, no. 7 (March 29, 2021): 3038. http://dx.doi.org/10.3390/app11073038.

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Transition metal complexes with dppz-type ligands (dppz = dipyrido[3,2-a:2′,3′-c]phenazine) are extensively studied and attract a considerable amount of attention, becoming, from the very beginning and increasingly over time, a powerful tool for investigating the structure of the DNA helix. In particular, [Ru(bpy)2(dppz)]2+ and [Ru(phen)2(dppz)]2+ and their derivatives were extensively investigated as DNA light-switches. The purpose of this mini-review, which is not and could not be exhaustive, was to first introduce DNA and its importance at a biological level and research in the field of small molecules that are capable of interacting with it, in all its forms. A brief overview is given of the results obtained on the Ru-dppz complexes that bind to DNA. The mechanism of the light-switch active in this type of species is also briefly introduced along with its effects on structural modifications on both the dppz ligand and the ancillary ligands. Finally, a brief mention is made of biological applications and the developments obtained due to new spectroscopic techniques, both for understanding the mechanism of action and for cellular imaging applications.
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Shahabadi, Nahid, and Maryam Mahdavi. "DNA Interaction Studies of a Cobalt(II) Mixed-Ligand Complex Containing Two Intercalating Ligands: 4,7-Dimethyl-1, 10-Phenanthroline and Dipyrido[3,2-a:2′,3′-c]phenazine." ISRN Inorganic Chemistry 2013 (December 30, 2013): 1–7. http://dx.doi.org/10.1155/2013/604218.

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A new cobalt(II) complex [Co(dppz)2(4,7-dmp)]2+ (4,7-dmp = 4,7-dimethyl-1,10-phenanthrolline) and dppz = dipyrido[3,2-a:2′-3′-c]phenazine has been synthesized and characterized by elemental analysis (CHN), FT-IR, and UV-visible (UV-Vis) spectroscopic techniques. The DNA-binding property of the complex has been investigated employing absorption spectroscopy, fluorescence spectroscopy, circular dichroism, and viscosity measurements. The experimental results show that the complex can bind to DNA in an intercalation mode. In comparison with previous study, the DNA-binding affinity of [Co(dppz)2(4,7-dmp)]2+ (Kb=1.1·106 M−1) is smaller than that of complex [Co(dppz)2(2,9-dmp)]2+ (Kb=2.5·106 M−1).
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He, Xiaojun, Lianhe Jin, and Lifeng Tan. "DNA-binding, topoisomerases I and II inhibition and in vitro cytotoxicity of ruthenium(II) polypyridyl complexes: [Ru(dppz)2L]2+ (L=dppz-11-CO2Me and dppz)." Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 135 (January 2015): 101–9. http://dx.doi.org/10.1016/j.saa.2014.06.147.

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Rochford, Garret, Zara Molphy, Kevin Kavanagh, Malachy McCann, Michael Devereux, Andrew Kellett, and Orla Howe. "Cu(ii) phenanthroline–phenazine complexes dysregulate mitochondrial function and stimulate apoptosis." Metallomics 12, no. 1 (2020): 65–78. http://dx.doi.org/10.1039/c9mt00187e.

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Herein we report the central role of the mitochondria in the cytotoxicity of four developmental cytotoxic copper(ii) complexes [Cu(phen)2]2+, [Cu(DPQ)(Phen)]2+, [Cu(DPPZ)(Phen)]2+ and [Cu(DPPN)(Phen)]2+ superior to cisplatin and independent of resistance in a range of cells.
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Dissertations / Theses on the topic "DPPZ"

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Derrat, Hanan S. "Organic and metal organic cationic DNA intercalators based on DPPZ analogues." Thesis, University of Sheffield, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.574605.

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New metal complex derivatives of tppz containing cationic "diquat" sites have been synthesized and characterized. Their interaction with DNA has also been explored .. Water-soluble organic cationic derivatives of the dppz ligand with a variety of functional groups and number of aromatic rings in the phenazine region have also been synthesised and characterized. These systems were synthesized with the aim of modulating the energy of the internal charge transfer excited state of the parent cation. The interactions of the new organic diquaterary salts of dppz with ON A have been studied. Metal complexes containing dppz ligands that are the free base analogues of the cationic systems have also been synthesized and their interaction with DNA has also been investigated.
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Dyer, Joanne. "Designing infrared probes of DNA based on rhenium tricarbonyl DPPZ complexes." Thesis, University of Nottingham, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.289455.

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Madureira, João Paulo Lopes. "Complexos de ruténio com ligandos politioéteres e/ou polipiridílicos : síntese, caracterização estrutural e interacção com o ADN." Doctoral thesis, Universidade de Aveiro, 2005. http://hdl.handle.net/10773/15264.

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Doutoramento em Química
Nesta tese são apresentados perto de quatro dezenas de novos complexos de ruténio(II), em cuja esfera de coordenação estão simultaneamente presentes um politioéter macrocíclico e um ligando polipiridílico. Os complexos sintetizados possuem as fórmulas genéricas [Ru([9]anoS3)(N-N)Cl]+ ou [Ru([12]anoS4)(N-N)]2+, em que [9]anoS3 é 1,4,7-tritiociclononano, [12]anoS4 é 1,4,7,10-tetratiociclododecano e N-N representa um ligando polipiridílico. Estes últimos foram seleccionados entre ligandos disponíveis comercialmente, de síntese conhecida da literatura, ou ainda entre novos derivados de dipirido[3,2-a:2’,3’-c]fenazina (ddpz). Os novos derivados de dppz foram concebidos com base numa das seguintes alternativas: i) expansão directa da superfície aromática; ii) acoplamento formal de pteridinas a uma unidade fenantrolina e iii) formação de ligações covalentes C-C entre dppz e grupos poliaromáticos. Foram também sintetizados duas dezenas de complexos de ruténio(II) em cuja esfera de coordenação se incluem macrociclos do tipo politioéter ou poliamina e variados ligandos monodentados, tais como halogenetos, dmso, MeCN, ou ligandos de azoto monocoordenados, como imidazol, indazol ou pirazol. Os diversos ligandos e complexos foram caracterizados por numerosas técnicas: infravermelho, Raman, RMN, absorção molecular, luminescência, espectrometria de massa (ES, FAB, EI), voltametria linear ou cíclica, espectroelectroquímica de UV/Vis/NIR ou de EPR, condutimetria, difracção de raios-X, microscopia electrónica de varrimento, ou análises elementares, para além de terem sido realizados cálculos teóricos auxiliares. Foi também estudado o comportamento em meio aquoso de alguns dos complexos sintetizados, assim como foi testada a capacidade de alguns dos complexos com ligandos polipiridílicos em interactuarem com o ADN. Para isso foram realizados ensaios de denaturação térmica, titulações de UV/Vis e estudos de luminescência em estado estacionário.
Nearly forty new ruthenium(II) complexes have been synthesised, with both polythioether macrocycles and polypyridyls present on the coordination sphere. The synthesised complexes have the general formula [Ru([9]aneS3)(N-N)Cl]+ or [Ru([12]aneS4)(N-N)]2+, where [9]aneS3, [12]aneS4, and N-N represents 1,4,7-trithiacyclononane, 1,4,7,10-tetrathiacyclododecane, and a polypyridyl ligand, respectively. N-N ligands have been selected from commercially available products, literature known compounds, and dipyridophenazine (dppz) new ligands, presented on this thesis. The new dipyridophenazine derivatives were designed with three different strategies: i) direct aromatic surface expansion; ii) pteridine formal coupling to a phenanthroline unit; and iii) C-C covalent bond formation between dppz and polyaromatic groups. Twenty ruthenium(II) complexes with a coordination sphere composed of a polythioether or polyamine macrocycle and several monodentate ligands (ex: halogens, dmso, MeCN and nitrogen heterocyles, as imidazole, indazole or pyrazole) have also been prepared. The ligands and complexes have been characterised by several techniques, namely: infrared, Raman, NMR, UV/Vis, luminescence, mass spectrometry (EI, ES, FAB), cyclic or linear voltammetry, UV/Vis/NIR and EPR spectro-electrochemistry, conductivity, X-ray diffraction, SEM, micro-analysis and theoretical calculations. Some of the complexes have been studied on aqueous or organic solutions in order to evaluate their reactivity and determine their formula on that media. Several polythioether-polypyridyl ruthenium complexes have been tested in order to evaluate theirs DNA interaction capability. The studies were conducted by UV/Vis titration, steady-state luminescence and thermal denaturation.
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Ergun, Seza. "Structural And Functional Investigation Of The Interaction Of Agomelatine With Model Membranes." Master's thesis, METU, 2012. http://etd.lib.metu.edu.tr/upload/12614997/index.pdf.

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Depression is one of the most commonly seen psychiatric diseases in the population in recent years. Treatment of depression is mainly carried out by psychiatric drugs. In the past few years, agomelatine which is released to the market with a trade name, Valdoxane, has been thought to have far less side effects due to its non-addictive nature, not having trouble when the drug is quitted, and also due to its property of binding only to the specific receptor that the drug interacts with. The action mechanism of agomelatine on the membrane structure has not been clarified yet, for instance, no study has been found in the literature about the interaction of agomelatin with the lipids of biological membranes. In this current study, the interaction of agomelatine with the model membranes of dipalmitoylphosphatidylcholine (DPPC), dipalmitoylphosphatidylgylcerol (DPPG) and sphingomyelin (SM) is examined by Fourier transform infrared spectroscopy (FTIR) and Differential scanning calorimetry (DSC). DSC and FTIR studies show that, agomelatine shifts the phase transition temperature of DPPC and DPPG multilamellar membrane to the lower degrees, however, it shifts the phase transition temperature of SM membrane to the higher degrees. Agomelatine addition increases the lipid order of the DPPC and SM liposome, whereas, it decreases the lipid order of DPPG liposome. Moreover this drug enhances the membrane fluidity among all types of liposome studied. The increase of v lipid order and increase of fluidity at DPPC and SM liposome indicates domain formation upon drug addition (Vest et al., 2004). This was also confirmed by DSC studies. Agomelatine enhances H bonding capacity of all types of liposomes have been studied. However it has different effects on glycerol backbones of the DPPC and DPPG liposomes. At low agomelatine concentrations the increase in the frequency values indicates a decrease in the hydrogen bonding capacity of the glycerol skeleton of DPPC. In contrast, at high concentrations of agomelatine, a decrease in the frequency values was observed as an indicator of the enhancement of the hydrogen bonding capacity. So it enhances H-bonding capacity at gel phase but lowers it at liquid chrystalline phases. A progressive decreases in Tm was observed at DPPG and DPPC liposomes where it increased the Tm at SM. The pretransition peak is abolished and the Tm peak becomes broad, indicating a larger perturbation to the membrane. These observations indicate the possible interaction of agomelatine with the head group as well. The shoulder seen at the thermograms of DPPC and DPPC liposomes at high doses may indicate the lateral phase separation in to drug-rich and drug-poor domains (D&rsquo
Souza et al., 2009). These results may indicate that agomelatine is partially buried in the hydrocarbon core of the bilayer, interacting primarily with the C2-C8 methylene region of the hydrocarbon chains. All these results highlight the fact that agomelatine interacts around the head group in such a manner that it destabilizes the membrane architecture to a large extent.
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Cafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." Thesis, The University of Sydney, 2008. http://hdl.handle.net/2123/3870.

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SYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol linker unit more commonly used. Chapter 1 places the work in the broad context of Molecular Electronics and establishes the need for this research. In Chapter 2 the multiple break-junction technique (using a Scanning Tunnelling Microscope or similar device) was used to investigate the conductance of various molecules with azine linkers. A major finding of those experiments is that solvent interactions are a key factor in the conductance signal of particular molecules. Some solvents interfere with the molecule’s interaction with and attachment to the gold electrodes. One indicator of the degree of this interference is the extent of the enhancement or otherwise of the gold quantized conduction peak at 1.0 G0. Below 1.0 G0 a broad range for which the molecule enhances conduction indicates that solvent interactions contribute to a variety of structures which could bridge the electrodes, each with their own specific conductance value. The use of histograms with a Log10 scale for conductance proved useful for observing broad range features. vi Another factor which affects the conductance signal is the geometric alignment of the molecule (or the molecule-solvent structure) to the gold electrode, and the molecular alignment is explored in Chapters 3 for 1,10-phenanthroline (PHEN) and Chapter 4 for thiols. In Chapter 3 STM images, electrochemistry, and Density Functional Theory (DFT) are used to determine 1,10-phenanthroline (PHEN) structures on the Au(111) surface. It is established that PHEN binds in two modes, a physisorbed state and a chemisorbed state. The chemisorbed state is more stable and involves the extraction of gold from the bulk to form adatom-PHEN entities which are highly mobile on the gold surface. Surface pitting is viewed as evidential of the formation of the adatom-molecule entities. DFT calculations in this chapter were performed by Ante Bilic and Jeffery Reimers. The conclusions to Chapter 3 implicate the adatom as a binding mode of thiols to gold and this is explored in Chapter 4 by a timely review of nascent research in the field. The adatom motif is identified as the major binding structure for thiol terminated molecules to gold, using the explanation of surface pitting in Chapter 3 as major evidence and substantiated by emergent literature, both experimental and theoretical. Furthermore, the effect of this binding mode on conductance is explored and structures relevant to the break-junction experiment of Chapter 2 are identified and their conductance values compared. Finally, as a result of researching extensive reports of molecular conductance values, and having attempted the same, a simple method for predicting the conductance of single molecules is presented based upon the tunneling conductance formula.
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Cafe, Peter F. "Towards reliable contacts of molecular electronic devices to gold electrodes." University of Sydney, 2008. http://hdl.handle.net/2123/3870.

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PhD
SYNOPSIS OF THIS THESIS The aim of this thesis is to more fully understand and explain the binding mechanism of organic molecules to the Au(111) surface and to explore the conduction of such molecules. It consists of five discreet chapters connected to each other by the central theme of “The Single Molecule Device: Conductance and Binding”. There is a deliberate concentration on azine linkers, in particular those with a 1,10-phenanthroline-type bidentate configuration at each end. This linker unit is called a “molecular alligator clip” and is investigated as an alternative to the thiol linker unit more commonly used. Chapter 1 places the work in the broad context of Molecular Electronics and establishes the need for this research. In Chapter 2 the multiple break-junction technique (using a Scanning Tunnelling Microscope or similar device) was used to investigate the conductance of various molecules with azine linkers. A major finding of those experiments is that solvent interactions are a key factor in the conductance signal of particular molecules. Some solvents interfere with the molecule’s interaction with and attachment to the gold electrodes. One indicator of the degree of this interference is the extent of the enhancement or otherwise of the gold quantized conduction peak at 1.0 G0. Below 1.0 G0 a broad range for which the molecule enhances conduction indicates that solvent interactions contribute to a variety of structures which could bridge the electrodes, each with their own specific conductance value. The use of histograms with a Log10 scale for conductance proved useful for observing broad range features. vi Another factor which affects the conductance signal is the geometric alignment of the molecule (or the molecule-solvent structure) to the gold electrode, and the molecular alignment is explored in Chapters 3 for 1,10-phenanthroline (PHEN) and Chapter 4 for thiols. In Chapter 3 STM images, electrochemistry, and Density Functional Theory (DFT) are used to determine 1,10-phenanthroline (PHEN) structures on the Au(111) surface. It is established that PHEN binds in two modes, a physisorbed state and a chemisorbed state. The chemisorbed state is more stable and involves the extraction of gold from the bulk to form adatom-PHEN entities which are highly mobile on the gold surface. Surface pitting is viewed as evidential of the formation of the adatom-molecule entities. DFT calculations in this chapter were performed by Ante Bilic and Jeffery Reimers. The conclusions to Chapter 3 implicate the adatom as a binding mode of thiols to gold and this is explored in Chapter 4 by a timely review of nascent research in the field. The adatom motif is identified as the major binding structure for thiol terminated molecules to gold, using the explanation of surface pitting in Chapter 3 as major evidence and substantiated by emergent literature, both experimental and theoretical. Furthermore, the effect of this binding mode on conductance is explored and structures relevant to the break-junction experiment of Chapter 2 are identified and their conductance values compared. Finally, as a result of researching extensive reports of molecular conductance values, and having attempted the same, a simple method for predicting the conductance of single molecules is presented based upon the tunneling conductance formula.
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7

Zbořilová, Hana. "Studium membránových vlastností liposomálních systémů pomocí fluorescenční spektroskopie." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2021. http://www.nusl.cz/ntk/nusl-449373.

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The presented diploma thesis is focused on the preparation, characterization and study of membrane properties of liposomal systems which were composed of the neutral phosphatidylcholine (DPPC), cholesterol, negatively charged phosphatidylglycerol (DPPG), polyethylenglycol bounded to phosphatidylethanolamine (PEG5000–PE) and polycation N,N,N-trimethylchitosan (TMC). The influence of individual components and their concentrations on the average particle size, zeta potential and changes in the outer and inner part of the bilayer was investigated. In this matter, methods of dynamic and electrophoretic light scattering and fluorescence spectroscopy with the application of laurdan and DPH probes were used. Based on the above-mentioned parameters, concentrations of components that most suitably influence properties of liposomes in terms of the intended application were selected for the definite complex. It was managed to prepare a liposomal complex stealth liposome–N,N,N-trimethylchitosan, which, due to the optimized composition, could have suitable attributes as a drug delivery system for inhalation administration of biologically active substances.
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Chi, Danny T., and Nien-Lou Li. "DPPM Optical Communications and Reed-Solomon Codes." International Foundation for Telemetering, 1992. http://hdl.handle.net/10150/608918.

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International Telemetering Conference Proceedings / October 26-29, 1992 / Town and Country Hotel and Convention Center, San Diego, California
Pulse position modulation (PPM) has many attractions for optical communication over deep space and for intersatellite communications. This paper describes a variate of PPM, known as differential pulse position modulation (DPPM) which can double the data throughput relative to PPM. We begin this paper with a survey of various laser sources and laser modulation techniques used in modem space optical communications. We then discuss the advantages of the combination of DPPM and Reed-Solomon (RS) codes.
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López-Amaya, Clara Inés. "Interaction of Candida rugosa lipase with DPPC liposomes." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/nq27441.pdf.

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Kell, Henny. "Wechselwirkung des Lipoheptapeptides Surfactin mit Lipiddoppelschichten aus DMPC und DPPC." [S.l.] : [s.n.], 2006. http://opus.kobv.de/tuberlin/volltexte/2007/1463.

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Books on the topic "DPPZ"

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Pelevin, Viktor Olegovich. DPP (NN). Moskva: ĖKSMO, 2010.

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Printing, London College of. Ladybird: DPPS project, 1986. London: LCP, 1986.

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Printing, London College of. Virago: DPPS poblishing project 1986. London: LCP, 1986.

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Printing, London College of. Souvenir Press: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. Virago Press: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. Academic Press: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. Michael Joseph: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. Michael Joseph: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. Pergamon Press: DPPS publishing project 1986. London: LCP, 1986.

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Printing, London College of. B & H: DPPS publishing project 1986. London: LCP, 1986.

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Book chapters on the topic "DPPZ"

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Zhang, Hui Emma, and Mark D. Gorrell. "DPP9." In Encyclopedia of Signaling Molecules, 1418–22. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_101597.

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Gorrell, Mark D., and Hui Emma Zhang. "DPP8." In Encyclopedia of Signaling Molecules, 1414–17. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67199-4_101654.

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Zhang, Hui Emma, and Mark D. Gorrell. "DPP9." In Encyclopedia of Signaling Molecules, 1–5. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4614-6438-9_101597-1.

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Gorrell, Mark D., and Hui Emma Zhang. "DPP8." In Encyclopedia of Signaling Molecules, 1–5. New York, NY: Springer New York, 2016. http://dx.doi.org/10.1007/978-1-4614-6438-9_101654-1.

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Gooch, Jan W. "DPP." In Encyclopedic Dictionary of Polymers, 242. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_3983.

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Perron, R. "The Dipalmitoylphosphatidylcholine (DPPC) — Water System." In Properties of Water in Foods, 37–47. Dordrecht: Springer Netherlands, 1985. http://dx.doi.org/10.1007/978-94-009-5103-7_3.

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Pham, Ngoc-Yen T., Christos Argyropoulos, and Nhan Dinh. "Dipeptidyl Peptidase-4 (DPP4) Inhibitors." In Diabetes and Kidney Disease, 583–99. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-86020-2_27.

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Mundici, Daniele. "Classi fulminee per DPP." In UNITEXT, 27–31. Milano: Springer Milan, 2011. http://dx.doi.org/10.1007/978-88-470-1884-6_5.

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Mundici, Daniele. "Fast Classes for DPP." In UNITEXT, 27–30. Milano: Springer Milan, 2012. http://dx.doi.org/10.1007/978-88-470-2361-1_5.

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Chiou, C. L. "Institutionalizing the Tangwai: The DPP." In Democratizing Oriental Despotism, 90–104. London: Palgrave Macmillan UK, 1995. http://dx.doi.org/10.1057/9780230389687_6.

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Conference papers on the topic "DPPZ"

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Zheng, Jiping, and Ganfeng Lu. "k-SDPP: Fixed-Size Video Summarization via Sequential Determinantal Point Processes." In Twenty-Ninth International Joint Conference on Artificial Intelligence and Seventeenth Pacific Rim International Conference on Artificial Intelligence {IJCAI-PRICAI-20}. California: International Joint Conferences on Artificial Intelligence Organization, 2020. http://dx.doi.org/10.24963/ijcai.2020/108.

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With the explosive growth of video data, video summarization which converts long-time videos to key frame sequences has become an important task in information retrieval and machine learning. Determinantal point processes (DPPs) which are elegant probabilistic models have been successfully applied to video summarization. However, existing DPP-based video summarization methods suffer from poor efficiency of outputting a specified size summary or neglecting inherent sequential nature of videos. In this paper, we propose a new model in the DPP lineage named k-SDPP in vein of sequential determinantal point processes but with fixed user specified size k. Our k-SDPP partitions sampled frames of a video into segments where each segment is with constant number of video frames. Moreover, an efficient branch and bound method (BB) considering sequential nature of the frames is provided to optimally select k frames delegating the summary from the divided segments. Experimental results show that our proposed BB method outperforms not only k-DPP and sequential DPP (seqDPP) but also the partition and Markovian assumption based methods.
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Imranpasha, Bharat Kumar, and S. L. N. Rao. "Interaction of β – N – oxalyl – L – α, β – diaminopropionic acid (ODAP) with Langmuir monolayers of DPPC, DPPG and cholesterol." In DAE SOLID STATE PHYSICS SYMPOSIUM 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0016881.

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Yu, Xiaochun, Yen-Tzu Lin, Wing-Chiu Tam, Osei Poku, and R. D. Blanton. "Controlling DPPM through Volume Diagnosis." In 2009 27th IEEE VLSI Test Symposium (VTS). IEEE, 2009. http://dx.doi.org/10.1109/vts.2009.49.

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Kalinowski, Marcos, and Guilherme Horta Travassos. "Uma Abordagem Probabilística para Análise Causal de Defeitos de Software." In Simpósio Brasileiro de Qualidade de Software. Sociedade Brasileira de Computação - SBC, 2012. http://dx.doi.org/10.5753/sbqs.2012.15335.

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Análise causal de defeitos tem se mostrado uma forma eficiente para melhoria de processos com base no produto. Nesta tese uma abordagem probabilística para análise causal, chamada DPPI (Defect Prevention-Based Process Improvement) foi elaborada com base em evidências obtidas a partir de quatro rodadas de revisão sistemática da literatura e feedback obtido de especialistas da área. DPPI representa uma abordagem inovadora que integra mecanismos de aprendizado de causa e efeito (redes Bayesianas) nos procedimentos de análise causal de defeitos. Adicionalmente, para facilitar o uso destes mecanismos em reuniões de análise causal, o tradicional diagrama de causa e efeito foi estendido para um diagrama de causa e efeito probabilístico. DPPI foi aplicada a um projeto real e avaliada através de três rodadas de um estudo experimental. A aplicação ao projeto real indicou sua viabilidade e permitiu refinar requisitos para a construção de apoio ferramental. As rodadas do estudo experimental forneceram indícios de que o uso dos diagramas de causa e efeito probabilísticos de DPPI aumenta a eficácia e reduz o esforço na identificação de causas de defeitos, quando comparado à identificação de causas de defeitos sem o uso dos diagramas.
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Mahmoud, Yousef. "Toward Reconfigurable DPP Converters." In 2022 13th International Renewable Energy Congress (IREC). IEEE, 2022. http://dx.doi.org/10.1109/irec56325.2022.10001949.

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Yin, Jun, and Yong Huang. "Investigation of Process-Induced Cell Membrane Stability Using Molecular Dynamics Simulation." In ASME 2009 International Manufacturing Science and Engineering Conference. ASMEDC, 2009. http://dx.doi.org/10.1115/msec2009-84374.

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Manufacturing process-induced damage to cells is of significant importance in biomaterial direct writing. For safe and reproducible cell direct writing, the process-induced cell damage must be understood in addition to biological property research. The objective of this study is to investigate the cell membrane stability under the external normal pressure. It is performed by studying the dipalmitoylphosphatidylcholine (DPPC) bilayer behavior under different normal pressures using molecular dynamics (MD). It is found that as the normal pressure increases, the thickness of DPPC bilayer decreases and the area of per DPPC molecule increases; and as the normal pressure increases, the rupture force to break the bilayer structure decreases, which can also be explained by the change of free energy difference before and after rupture under different normal pressures. This study serves as the first step towards understanding of the cell damage mechanism in cell direct writing.
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Aruk, Natasha, Cathrine V. Jansson-Boyd, and Nathan Crilly. "What users know about the design process." In DPPI '11: Designing Pleasurable Products and Interfaces. New York, NY, USA: ACM, 2011. http://dx.doi.org/10.1145/2347504.2543533.

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Wang, Jingyuan, Zhiyong Xu, and Weisheng Hu. "Improved DPPM modulation for optical wireless communications." In Asia-Pacific Optical and Wireless Communications, edited by Cedric F. Lam, Chongcheng Fan, Norbert Hanik, and Kimio Oguchi. SPIE, 2004. http://dx.doi.org/10.1117/12.522349.

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Iles, Harrison, and Yousef Mahmoud. "DPP Converters with Reduced Sensors." In IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society. IEEE, 2022. http://dx.doi.org/10.1109/iecon49645.2022.9969018.

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Mohd, Hur Munawar Kabir, Ainee Fatimah Ahmad, Shahidan Radiman, Faizal Mohamed, Nur Ratasha Alia Md Rosli, Muhammad Taqiyuddin Mawardi Ayob, and Irman Abdul Rahman. "Interaction between silicon dioxide and dipalmitoylphosphatidylcholine (DPPC) vesicles." In THE 2014 UKM FST POSTGRADUATE COLLOQUIUM: Proceedings of the Universiti Kebangsaan Malaysia, Faculty of Science and Technology 2014 Postgraduate Colloquium. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4895172.

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Reports on the topic "DPPZ"

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Miller, Paul Matthew. Plasma Sciences Exposition at APS-DPP. Office of Scientific and Technical Information (OSTI), September 2017. http://dx.doi.org/10.2172/1391881.

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Smine, Georges E., and Vason P. Srini. Area Efficient Cells for LagerIV's DPP Library. Fort Belvoir, VA: Defense Technical Information Center, August 1989. http://dx.doi.org/10.21236/ada632157.

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Nogradi Jr, Paul, Oscar Martinez, Abiodun Adeniyi, and Blake Van Hoy. Test Report for DPP-1 Regulatory Compliance Testing. Office of Scientific and Technical Information (OSTI), April 2022. http://dx.doi.org/10.2172/1869080.

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DEPARTMENT OF DEFENSE WASHINGTON DC. Defense Planning and Programming Category (DPPC) Definitions and Program Element Code Assignments. Fort Belvoir, VA: Defense Technical Information Center, January 1993. http://dx.doi.org/10.21236/ada259820.

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Friedman, Alex. Comments on initiatives submitted for APS-DPP-CPP meeting, Madison WI, July 22-26, 2019. Office of Scientific and Technical Information (OSTI), July 2019. http://dx.doi.org/10.2172/1544478.

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Hutzler, Patricia I. Defense Planning and Programming Categories: A Special Tool for Special Needs. Volume 3. Appendix E. Proposed Expanded DPPC Structure. Fort Belvoir, VA: Defense Technical Information Center, April 1990. http://dx.doi.org/10.21236/ada230860.

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Shiyu, LIU, DENG Huan, and CHEN Qiu. Effect of DPP-4 inhibitor on Cognitive Dysfunction in Diabetes :A systematic review and meta-analysis protocol. INPLASY - International Platform of Registered Systematic Review Protocols, April 2020. http://dx.doi.org/10.37766/inplasy2020.4.0185.

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Hegland, Troels Jacob, and Søren Qvist Eliasen. Rekruttering til og fastholdelse i dansk fiskeri - med særlig fokus på Fiskeriskolens uddannelse. Centre for Blue Governance, Aalborg University, 2022. http://dx.doi.org/10.54337/aau460210943.

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Denne rapport præsenterer resultaterne fra projektet ’Fremtidens Fiskere’. I rapporten behandles rekrutteringsudfordringer i dansk fiskeri med særlig fokus på Fiskeriskolens uddannelse. Formålet med undersøgelsen har været at tilvejebringe et bredere og mere systematisk vidensgrundlag, som branchen kan bruge til at imødegå rekrutteringsproblemer og udfordringer afledt deraf, f.eks. generationsskifte. Rapporten baserer sig på et litteraturstudie samt kvalitative interviews med elever på Fiskeriskolen (der er lærlinge i forhold til praktikken) samt andre aktører i fiskeriet som den centrale empiri. Undervejs har vi sparret med repræsentanter fra de tre fiskeriorganisationer FSK‐PO, DFPO og DPPO, samt ansatte på Fiskeriskolen. Konklusionerne er dog udelukkende forfatternes egne. Undersøgelsen har haft som hovedformål at forstå de unges værdier og billeder af fiskeriet mhp. at kunne øge rekrutteringen til (og fastholdelsen i) dansk fiskeri og specielt Fiskeriskolen. I denne proces har vi behandlet 3 overordnede problemstillingskomplekser, som har betydning ift. at imødegå rekrutteringsudfordringerne i dansk fiskeri: rekruttering til Fiskeriskolen; rekruttering til hele fiskerierhvervet; samt Fiskeriskolens uddannelse.
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Wilke, et al. Vergleich der Gesundheitskosten von Typ-2 Diabetikern bei der Anwendung von Empagliflozin, DPP-4-Hemmern und GLP-1-Agonisten. Monitor Versorgungsforschung, 2022. http://dx.doi.org/10.24945/mvf.06.22.1866-0533.2448.

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Yang, Fan, Quanlin Zhao, Youzi Dong, Baohua Li, and Bobiao Ning. Pancreatic safety of DPP-4 Inhibitors in type 2 diabetes millitus A protocol for systematic review and network meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, March 2022. http://dx.doi.org/10.37766/inplasy2022.3.0014.

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