cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Antiproliferative potential of 3β,5α,6β,7α-tetrahydroxyergosta-8(14),22-diene produced by Acremonium persicinum isolated from an alkaline crater lake in Puebla, Mexico
Creators: name: Franceschy, César
name: Espinoza, César
name: Padrón, José M.
name: Landa-Cadena, Gandhi
name: Norte, Manuel
name: Fernández, José J.
name: Shnyreva, Alla
name: Trigos, Ángel
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Microbiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: Cancer

description: The sterol 3β,5α,6β,7α-tetrahydroxyergosta-8(14),22-diene was obtained from bio-guided fractioning of the chloroform extract of 50 L of liquid culture of Acremonium persicinum. This fungal strain was selected because of its anti-proliferative activity against solid human tumour cell lines (GI50 ≤ 50 μg/mL) in a bio-prospective study of fungi isolated from plant material, sediment and water samples obtained from alkaline lakes Alchichica and Atexcac in Puebla, Mexico. This compound showed GI50 (μM) values of: 16, 24, 18, 15 and 12 against tumour cell lines A-549, HBL-100, HeLa, T-47D and WiDr respectively. GI50 effects against tumour lines T-47D and WiDr were found to be greater than the clinically used drugs Etoposide and Cisplatin. Because of this, the results obtained support the pharmacological importance of the microorganisms that develop in these ecosystems and strengthen the non-invasive bio-prospection studies that our work group has developed in recent years.
Chemical constituents of Vietnamese mangrove Hibiscus tiliaceus with antioxidant and alpha-glucosidase inhibitory activity
Creators: name: Le Ba Vinh
name: Nguyet, Nguyen Thi Minh
name: Thanh, Chu Duc
name: Huong, Tran Thu
name: Le Huyen Tram
name: Van Thong, Nguyen
name: Minh, Nguyen Hoang
name: Thao, Nguyen Phuong
name: Hwang, Inkyu
name: Yang, Seo Young
name: Kim, Young Ho
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences

description: Using various chromatographic techniques, a total of 15 compounds, including one novel megastigmane named tiliaceic acid A (1) and 14 known compounds, were isolated from the traditional medicinal Vietnamese mangrove Hibiscus tiliaceus. Their structures were confirmed based on spectroscopic experiments including, UV, 1 D- and 2 D-NMR, HR-ESI-MS, and ECD analysis. The antioxidant and α-glucosidase inhibitory activities of the isolated compounds from H. tiliaceus were evaluated for the first time. Compound 2 showed strong α-glucosidase inhibitory activity with an IC50 of 77.78 ± 1.00 μM compared with the positive control acarbose at 105.71 ± 2.29 μM.
SUSY dark matter in light of CDMS II results: a comparative study for different models
Creators: name: Cao, Junjie
name: Hikasa, Ken-ichi
name: Wang, Wenyu
name: Yang, Jin Min
name: Yu, Li-Xin
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We perform a comparative study of the neutralino dark matter scattering on nucleon in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). First, we give the predictions of the elastic cross section by scanning over the parameter space allowed by various direct and indirect constraints, which are from the measurement of the cosmic dark matter relic density, the collider search for Higgs boson and sparticles, the precision electroweak measurements and the muon anomalous magnetic moment. Then we demonstrate the property of the allowed parameter space with/without the new limits from CDMS II. We obtain the following observations: (i) For each model the new CDMS limits can exclude a large part of the parameter space allowed by current collider constraints; (ii) The property of the allowed parameter space is similar for MSSM and NMSSM, but quite different for nMSSM; (iii) The future SuperCDMS can cover most part of the allowed parameter space for each model.
description: 12 pages, 10 figs
Transformation Optics in Nonvacuum Initial Dielectric Media
Creators: name: Thompson, Robert T.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: Previous formulations of transformation optics have generally been restricted to transformations from relatively simple initial media, such as the vacuum, because of limitations due to their non-covariance. I show that a completely covariant approach enables arbitrary transformations from arbitrarily complex initial linear dielectrics.
description: 6 pages
Saponin with antibacterial activity from the roots of Albizia adianthifolia
Creators: name: Sonfack, Gaiëlle
name: Tchinda, Cedric Fossi
name: Simo, Ingrid Konga
name: Bitchagno, Gabin Thierry M.
name: Nganou, Blaise Kemajou
name: Çelik, İlhami
name: Tene, Mathieu
name: Görkem, Sultan Funda
name: Opatz, Till
name: Beng, Veronique Penlap
name: Kuete, Victor
name: Tane, Pierre
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: An unprecedented saponin is being reported herein together with five known compounds from the methanol extract of the roots of Albizia adianthifolia. The metabolites were obtained over repeated open column chromatography methods and spectroscopic followed by spectrometric techniques. The isolated compounds were tested against eleven Gram-negative bacteria including multidrug resistant strains. The results revealed considerable inhibition of the new saponin against the studied bacteria with MIC values ranging from 16 to 128 μg/mL.
XWeB: the XML Warehouse Benchmark
Creators: name: Mahboubi, Hadj
name: Darmont, Jérôme
Publisher: name: arXiv
Year: 2011
Subjects: subject: Databases (cs.DB)
subject: FOS: Computer and information sciences

description: With the emergence of XML as a standard for representing business data, new decision support applications are being developed. These XML data warehouses aim at supporting On-Line Analytical Processing (OLAP) operations that manipulate irregular XML data. To ensure feasibility of these new tools, important performance issues must be addressed. Performance is customarily assessed with the help of benchmarks. However, decision support benchmarks do not currently support XML features. In this paper, we introduce the XML Warehouse Benchmark (XWeB), which aims at filling this gap. XWeB derives from the relational decision support benchmark TPC-H. It is mainly composed of a test data warehouse that is based on a unified reference model for XML warehouses and that features XML-specific structures, and its associate XQuery decision support workload. XWeB's usage is illustrated by experiments on several XML database management systems.
Exclusive Production of $D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ via $e^+ e^-$ Annihilation with Initial-State-Radiation
Creators: name: The BABAR Collaboration
name: al., P. del Amo Sanchez et
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences

description: We perform a study of exclusive production of$D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ final states in initial-state-radiation events from $e^+ e^-$ annihilations at a center-of-mass energy near 10.58 GeV, to search for charmonium $1^{--}$ states. The data sample corresponds to an integrated luminosity of 525 $fb^{-1}$ and was recorded by the BaBar experiment at the PEP-II storage ring. The $D^+_sD^-_s$, $D^{*+}_sD^-_s$, and $D^{*+}_sD^{*-}_s$ mass spectra show evidence of the known $ψ$ resonances. Limits are extracted for the branching ratios of the decays $X(4260)\to D^{(*)+}_sD^{(*)-}_s$.
description: 12 pages, 6 postscript figures, submitted to Phys. Rev. D
Two-dimensional assembly of gold nanoparticles grafted with charged-end-group polymers
Creators: name: Kim, Hyeong Jin
name: Nayak, Binay P.
name: Zhang, Honghu
name: Ocko, Benjamin M.
name: Travesset, Alex
name: Vaknin, David
name: Mallapragada, Surya K.
name: Wang, Wenjie
Publisher: name: arXiv
Year: 2023
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Hypothesis: Introducing charged terminal groups to polymers that graft nanoparticles enables Coulombic control over their assembly by tuning the pH and salinity of aqueous suspensions. Experiments: Gold nanoparticles (AuNPs) are grafted with poly(ethylene glycol) (PEG) terminated with CH3 (charge-neutral), COOH (negatively charged), or NH2 (positively charged) groups. The nanoparticles are characterized using dynamic light scattering, zeta-potential, and thermal gravimetric analysis. Liquid surface X-ray reflectivity (XR) and grazing incidence small-angle X-ray scattering (GISAXS) techniques are employed to determine the density profile and in-plane structure of the AuNP assembly across and on the aqueous surface. Findings: The assembly of PEG-AuNPs at the liquid/vapor interface can be tuned by adjusting pH or salinity, particularly for COOH terminals. However, the effect is less pronounced for NH2 terminals. These distinct assembly behaviors are attributed to the overall charge of PEG-AuNPs and the conformation of PEG. The COOH-PEG corona is the most compact, resulting in smaller superlattice constants. The net charge per particle depends not only on the PEG terminal groups but also on the cation sequestration of PEG and the intrinsic negative charge of the AuNP surface. NH2-PEG, due to its closeness to overall charge neutrality and the presence of hydrogen bonding, enables the assembly of NH2-PEG-AuNPs more readily.
description: Published in the Journal of Colloid and Interface Science, DOI - 10.1016/j.jcis.2023.07.095
Flavonoids from Polyalthia longifolia prevents advanced glycation end products formation and protein oxidation aligned with fructose-induced protein glycation
Creators: name: Rai, Amit K.
name: Singh, Suriya P.
name: Pandey, Alka Raj
name: Ansari, Alisha
name: Ahmad, Shadab
name: Sashidhara, Koneni V.
name: Tamrakar, Akhilesh K.
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Genetics
subject: FOS: Biological sciences
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: 69999 Biological Sciences not elsewhere classified
subject: Developmental Biology
subject: Cancer
subject: Inorganic Chemistry
subject: 110309 Infectious Diseases
subject: FOS: Health sciences

description: Advanced glycation end products (AGEs) are reactive chemical entities formed by non-enzymatic reaction between reducing sugars and amino group of proteins. Enhanced accumulation of AGEs and associated protein oxidation contribute to pathogenesis of diabetes-associated complications. Here, we evaluated the inhibitory activity of flavonoid compounds isolated from the leaves of Polyalthia longifolia on formation of AGEs and protein oxidation. Antiglycation activity was determined by measuring the formation of AGE fluorescence intensity, Nε-(carboxymethyl) lysine, and level of fructosamine. Protein oxidation was examined using levels of protein carbonyls and thiol group. Compounds significantly (p Polyalthia longifolia inhibit fructose-mediated protein glycation and oxidation, and can be potential agent for preventing AGE-mediated diabetic complications.
Unitary representations of the universal cover of SU(1,1) and tensor products
Creators: name: Tomasini, Guillaume
name: Orsted, Bent
Publisher: name: arXiv
Year: 2011
Subjects: subject: Representation Theory (math.RT)
subject: FOS: Mathematics

description: In this paper we initiate a study of the relation between weight modules for simple Lie algebras and unitary representations of the corresponding simply-connected Lie groups. In particular we consider in detail from this point of view the universal covering group of SU(1,1), including new results on the discrete part of tensor products of irreducible representations. As a consequence of these results, we show that the set of smooth vectors of the tensor product intersects trivially some of the representations in the discrete spectrum.
description: 38 pages
Apigenin rich-Limonium duriusculum (de Girard) Kuntze promotes apoptosis in HCT116 cancer cells
Creators: name: Hamadou, Meriem Hadjer
name: Kerkatou, Messaoud
name: Gatto, Pamela
name: Pancher, Michael
name: Bisio, Alessandra
name: Inga, Alberto
name: Menad, Ahmed
name: Benayache, Samir
name: Benayache, Fadila
name: Ameddah, Souad
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Cell Biology
subject: Genetics
subject: FOS: Biological sciences
subject: Physiology
subject: Pharmacology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Developmental Biology
subject: Cancer
subject: Hematology
subject: Plant Biology

description: The pro-apoptotic property of n-BuOH extract of Limonium duriusculum (BEL) and its major isolated components [apigenin (APG1) and apigenin7-O-β-D-(6''-methylglucuronide) (APG2)] were tested. The anti-proliferative IC50 of BEL and APG1 was quantified as 7.60 µg/mL and 25.74 µM respectively, while APG2 did not affect cell proliferation in HCT116 p53 wild type cells. Growth inhibition by BEL treatment was associated with reduced signaling from the MAP kinase, activation of the p53 response pathway and PARP cleavage. The multi-effect of Limonium duriusculum could be due through their major apigenin compounds and the other bioactive constituents that may possibly act in synergy to exercise the most favorable anti-tumor activities.
Antioxidant activity and phenolic compounds identification of Micromeria inodora (Desf.) Benth. from Western Algeria
Creators: name: Adjdir, Sara
name: Benariba, Nabila
name: Haci, Imad Abdelhamid El
name: Ouffai, Khaoula
name: Bekkara, Fouzia Atik
name: Djaziri, Rabah
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular Biology
subject: Pharmacology
subject: Biotechnology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology
subject: Science Policy
subject: 69999 Biological Sciences not elsewhere classified
subject: Plant Biology

description: Micromeria inodora (Desf.) Benth. is most studied for the antimicrobial activity of their essential oils; nevertheless there are no reports on the phenolic compounds of this species and their antioxidant activity. In this study, aqueous and organic extracts were assayed for their antioxidant activity. The polyphenol and total flavonoid content, varied between 175.50 and 332.62 mg GAE/g extract and 65.38–86.30 mg catechin equivalent/g extract, respectively. The results of antioxidant activity have shown that all extracts reported an important activity and the ethyl acetate extract showed the stronger effect, higher than some standards molecules. Its IC50 value of scavenging DPPH is 1.5 ± 0.001 μg/mL; β-Carotene Bleaching assay (BCB) IC50 = 28.1 ± 0.001 μg/mL and the Ferric Reducing Antioxidant Power (FRAP) IC50 = 6.96 ± 0.05 μg/mL. RP-HPLCPDA analysis of phenolic compounds revealed the presence of phenolic acids and flavonoids as: gallic acid, quercetin, rutin, vanillin and naringenin.
Phytochemical analysis and evaluation of the antimicrobial and antioxidant activities of extracts and fractions of Hymenaea eriogyne Benth
Creators: name: Silva, Sarah Luanne
name: Tenório, Camylla Janiele Lucas
name: de Lima, Liliane Bezerra
name: Procópio, Thamara Figueiredo
name: de Moura, Maiara Celine
name: Napoleão, Thiago Henrique
name: Ferreira, Magda Rhayanny Assunção
name: Soares, Luiz Alberto Lira
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Cell Biology
subject: 59999 Environmental Sciences not elsewhere classified
subject: FOS: Earth and related environmental sciences
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Science Policy
subject: Hematology

description: The objective of this study was to conduct phytochemical characterization and biological evaluation of Hymenaea eriogyne. Crude extracts and fractions from the bark, leaves and pods, were obtained for phytochemical screening by TLC and HPLC, and evaluation of antibacterial and antioxidant potential. Chromatographic data revealed the presence of several metabolites, notably from the flavonoid class. HPLC analysis confirmed the presence of the flavanonol astilbin (taxifolin 3-O-ramnoside) and other flavonoids derived from aglycone taxifolin. In addition, it was possible to quantify phytochemical markers in the extracts and fractions, which showed an increased content of flavonoid and catechin derivatives in the fraction. Better results of the minimum inhibitory/bactericidal concentrations were obtained with extracts and fractions from bark. In the antioxidant activity using the DPPH method, the enriched bark fraction presented an IC50 of 34.46 µg/mL. These results contribute to the continuity of studies on the chemical and biological composition of the species.
Spectral theorem for the Lindblad equation for quadratic open fermionic systems
Creators: name: Prosen, Tomaz
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: The spectral theorem is proven for the quantum dynamics of quadratic open systems of n fermions described by the Lindblad equation. Invariant eigenspaces of the many-body Liouvillean dynamics and their largest Jordan blocks are explicitly constructed for all eigenvalues. For eigenvalue zero we describe an algebraic procedure for constructing (possibly higher dimensional) spaces of (degenerate) non-equilibrium steady states.
description: 19 pages, no figures
Design and analysis of energy harvesting wireless communication systems
Creators: name: Ahmed, Imran
Publisher: name: University of British Columbia
Year: 2017

description: Recent advancement in wireless communication networks expect exponential growth of smart phones, diverse wireless services and Internet of Things (IoT) applications. The extensive growth of wireless devices can significantly increase energy consumption, and therefore, creates environmental pollution. An urge for green communication is building up day by day. As a matter of fact, there is a need to design environment friendly wireless communication technologies and energy efficient resource allocation solutions, which will potentially drive the next generation of wireless communication. In this thesis, we design and analyse energy harvesting wireless communication system by considering both renewable energy and RF energy sources. For a relayed communication system, we develop joint optimal power and power-splitting ratio allocation scheme where relay does not have its own energy supply. The relay harvests energy from interference and the signal received from the source. We consider both half-duplex and full-duplex relaying. For half-duplex relaying, we analyse the amount of harvested energy by controlling the amount of incoming interference using power splitting ratio. In addition, we show the impact of self-interference for full-duplex relay and compare the results with half-duplex cooperative energy harvesting wireless networks. Next, we consider multi-relay network, where relays harvest renewable energies from the surrounding environment. For this setup, we propose the optimal policy for relay selection and power allocation under unknown statistics of the channel fading and energy arrival processes. In particular, we develop an efficient low-complexity learning algorithm that does not require the statistics of the channel fading and energy harvesting processes to be known.
A multiwavelength study of Cygnus X-1: the first mid-infrared spectroscopic detection of compact jets
Creators: name: Rahoui, Farid
name: Lee, Julia C.
name: Heinz, Sebastian
name: Hines, Dean C.
name: Pottschmidt, Katja
name: Wilms, Jörn
name: Grinberg, Victoria
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We report on a Spitzer/IRS (mid-infrared), RXTE/PCA+HEXTE (X-ray), and Ryle (radio) simultaneous multiwavelength study of the microquasar Cygnus X-1, which aimed at an investigation of the origin of its mid-infrared emission. Compact jets were present in two out of three observations, and we show that they strongly contribute to the mid-infrared continuum. During the first observation, we detect the spectral break - where the transition from the optically thick to the optically thin regime takes place - at about 2.9e13 Hz. We then show that the jet's optically thin synchrotron emission accounts for the Cygnus X-1's emission beyond 400 keV, although it cannot alone explain its 3-200 keV continuum. A compact jet was also present during the second observation, but we do not detect the break, since it has likely shifted to higher frequencies. In contrast, the compact jet was absent during the last observation, and we show that the 5-30 micron mid-infrared continuum of Cygnus X-1 stems from the blue supergiant companion star HD 226868. Indeed, the emission can then be understood as the combination of the photospheric Raleigh-Jeans tail and the bremsstrahlung from the expanding stellar wind. Moreover, the stellar wind is found to be clumpy, with a filling factor f {\infty}~0.09-0.10. Its bremsstrahlung emission is likely anti-correlated to the soft X-ray emission, suggesting an anti-correlation between the mass-loss and mass-accretion rates. Nevertheless, we do not detect any mid-infared spectroscopic evidence of interaction between the jets and the Cygnus X-1's environment and/or companion star's stellar wind.
description: 46 pages, 10 figures, 8 tables. Accepted for publication in ApJ
Polarization Criterion in Targeted SETI Observation
Creators: name: Li, Jian-Kang
name: Chen, Yu
name: Tao, Zhen-Zhao
name: Luan, Xiao-Hang
name: Zhang, Tong-Jie
name: Huang, Bo-Lun
name: Sun, Xiao-Hui
name: Gajjar, Vishal
Publisher: name: arXiv
Year: 2023
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: Earth and Planetary Astrophysics (astro-ph.EP)
subject: Solar and Stellar Astrophysics (astro-ph.SR)
subject: FOS: Physical sciences

description: In this paper, we propose a novel method for distinguishing extraterrestrial intelligence (ETI) signals from radio frequency interference (RFI) by leveraging polarization features. We exploit the sinusoidal variation of the linearly polarized components of Stokes parameters with the parallactic angle as a characteristic signature of ETI signals, while such linearly polarized components remain relatively stable for terrestrial RFI. Typically, a minimum of 4-8 hours of observation time is required to detect these sinusoidal variations. The polarization approach in the search for extraterrestrial intelligence (SETI) also enables us to study the radio stellar bursts emitted by M-type stars as ancillary science, which is relevant to assessing the habitability of exoplanets. Compared to the frequency drift method, the polarization method effectively reduces the required observation time for signal identification while improving the signal identification process.
description: 8 pages, 2 figures, published in The Astronomical Journal. Using polarization features as the criterion in SETI research
Phytochemical analysis of crude extract of Delphinium brunonianum and its effect on hypertension and metabolic perturbations in fructose fed rats
Creators: name: Asif, Hira
name: Alamgeer
name: Bukhari, Ishfaq Ali
name: Vohra, Fahim
name: Afzal, Sibtain
name: Khan, Sher Wali
name: Niazi, Zahid Rasul
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Space Science
subject: Medicine
subject: Neuroscience
subject: Physiology
subject: FOS: Biological sciences
subject: Pharmacology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Ecology

description: The present study aims at phytochemical profiling and valuating the effect of crude extract of Delphinium brunonianum on fructose mediated rise in blood pressure and metabolic abnormalities in rats. Therefore, rats were fed on fructose (10%w/v) for 6 weeks. Rats in treatment groups received amlodipine 250, 500 and 1000 mg/kg of DB-Cr separately in concurrent to fructose. Various parameters of metabolic perturbations were assessed at the end of study. Further, DB-Cr was analyzed using LC-MS technique. DB-Cr exerted remarkable antihypertensive effect whereas, sympathetic hyperactivity and hyperinsulinemia in these rats was significantly blunted, further, endothelium functionality was successfully restored. LC-MS analysis of DB-Cr revealed the presence of a variety of chemical constituents (41) including quinic acid, scopolin, gingerol, Robinetin 3-rutinoside, KAPA and maleic acid. In conclusion, D. brunonianum possess the potential to combat the fructose mediated hypertension and metabolic perturbations, which may partially be due to its chemical constituents.
High Performance Power Spectrum Analysis Using a FPGA Based Reconfigurable Computing Platform
Creators: name: Abhyankar, Yogindra
name: C., Sajish
name: Agarwal, Yogesh
name: Subrahmanya, C. R.
name: Prasad, Peeyush
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Methods for Astrophysics (astro-ph.IM)
subject: FOS: Physical sciences

description: Power-spectrum analysis is an important tool providing critical information about a signal. The range of applications includes communication-systems to DNA-sequencing. If there is interference present on a transmitted signal, it could be due to a natural cause or superimposed forcefully. In the latter case, its early detection and analysis becomes important. In such situations having a small observation window, a quick look at power-spectrum can reveal a great deal of information, including frequency and source of interference. In this paper, we present our design of a FPGA based reconfigurable platform for high performance power-spectrum analysis. This allows for the real-time data-acquisition and processing of samples of the incoming signal in a small time frame. The processing consists of computation of power, its average and peak, over a set of input values. This platform sustains simultaneous data streams on each of the four input channels.
description: 5 pages, 3 figures. Published in the Proceedings of the IEEE International conference on Reconfigurable Computing and FPGAs (ReConFig 2006). Article also available at http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber=4100006&isnumber=4099958
Temperature and bias voltage dependence of Co/Pd multilayer-based magnetic tunnel junctions with perpendicular magnetic anisotropy
Creators: name: Kugler, Zoë
name: Drewello, Volker
name: Schäfers, Markus
name: Schmalhorst, Jan
name: Reiss, Günter
name: Thomas, Andy
Publisher: name: arXiv
Year: 2010
Subjects: subject: Materials Science (cond-mat.mtrl-sci)
subject: FOS: Physical sciences

description: Temperature- and bias voltage-dependent transport measurements of magnetic tunnel junctions (MTJs) with perpendicularly magnetized Co/Pd electrodes are presented. Magnetization measurements of the Co/Pd multilayers are performed to characterize the electrodes. The effects of the Co layer thickness in the Co/Pd bilayers, the annealing temperature, the Co thickness at the MgO barrier interface, and the number of bilayers on the tunneling magneto resistance (TMR) effect are investigated. TMR-ratios of about 11 % at room temperature and 18.5 % at 13 K are measured and two well-defined switching fields are observed. The results are compared to measurements of MTJs with Co-Fe-B electrodes and in-plane anisotropy.
Chameleon Labels for Staining and Quantifying Proteins
Creators: name: Wetzl, Bianca K.
name: Yarmoluk, Sergiy M.
name: Craig, Douglas B.
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: electrophoresis;fluorescent probes;protein assay;proteomics
subject: 540 Chemie

description: Glowing marks: A new class of protein stains, the pyrylium dyes, undergo a strong color change (typically from blue to red, see picture) on covalently binding to proteins. While the free stains are almost nonfluorescent, the protein-conjugated forms are highly fluorescent. The dyes do not alter the charge of a protein, and thus do not change its electrophoretic properties. The stains also can be used in quantitative protein assays.
Measuring Supersymmetry with Heavy Scalars
Creators: name: Turlay, Emmanuel
name: Lafaye, Remi
name: Plehn, Tilman
name: Rauch, Michael
name: Zerwas, Dirk
Publisher: name: arXiv
Year: 2010
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: Supersymmetry with heavy scalars is a model where at the LHC we have to rely on rate measurements to determine the parameters of the underlying new physics. For this example we show how to properly combine rate measurements with kinematic endpoints, taking into account statistical, systematic and theory uncertainties. Provided we observe a sizeable number of events the LHC should be able to determine many model parameters with small enough error bars to for example test unification patterns.
description: 13 pages, 8 tables
Detecting quark matter in the early universe by gravitational waves
Creators: name: Schettler, Simon
name: Boeckel, Tillmann
name: Schaffner-Bielich, Jurgen
Publisher: name: arXiv
Year: 2011
Subjects: subject: Cosmology and Nongalactic Astrophysics (astro-ph.CO)
subject: FOS: Physical sciences

description: For large baryochemical potential, strongly interacting matter might undergo a first order phase transition at temperatures T ~ 100-200 MeV. Within standard cosmology, however, the chemical potential is assumed to be very small leading to a crossover. We discuss implications of a first order QCD transition at high chemical potential being consistent with current observations. In this contribution we concentrate on effects on the gravitational wave spectrum. There are other interesting cosmological signals as a modification of the power spectrum of dark matter, the production of stellar black holes, and the seeds for the extragalactic magnetic fields which we briefly address also.
description: 10 pages, talk given at the symposium "Advances in Nuclear Physics in Our Time", Goa, India, Nov. 28 - Dec. 2, 2010
Face amplitude of spinfoam quantum gravity
Creators: name: Bianchi, Eugenio
name: Regoli, Daniele
name: Rovelli, Carlo
Publisher: name: arXiv
Year: 2010
Subjects: subject: General Relativity and Quantum Cosmology (gr-qc)
subject: FOS: Physical sciences

description: The structure of the boundary Hilbert-space and the condition that amplitudes behave appropriately under compositions determine the face amplitude of a spinfoam theory. In quantum gravity the face amplitude turns out to be simpler than originally thought.
description: 5 pages, 2 figures
Fluorescence Analysis in Microarray Technology
Creators: name: Nagl, Stefan
name: Schäferling, Michael
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Microarray technology; fluorescence analysis; signal amplification; optical methods; fluorescence lifetime imaging
subject: 540 Chemie

description: Fluorescence has been the preferred choice for data quantification in biomedical microarray formats since their earliest days. As much as the formats have grown and evolved over the years, the methods in optical analysis have become ever more sophisticated and complex in order to produce more and better output. This review will provide an insight into the most common methods and the state-of-the-art of all areas in microarray fluorescence analysis. Starting with an overview on microarray formats with a focus on their demands on the readout, the most common and useful organic fluorescent stains are discussed before proceeding on to other approaches; the use of semiconductor nanocrystals (quantum dots), polymer and silica nanoparticles and fluorescent proteins. Ways to enhance the intrinsically low signal on biochips have become increasingly important as they offer a sound approach towards the detection of low concentration sample content. The three main categories are presented: amplification using DNA, enzymes, and dendrimers. As much diversity as on the microarrays themselves can be found at the detection device. Standard optical microarray detectors, and non-standard methods using fluorescence anisotropy, fluorescence lifetime imaging (FLIM) and fluorescence resonance energy transfer (FRET), and their advantages and disadvantages are discussed.
Fluorescent pH sensors with negligible sensitivity to ionic strength
Creators: name: Weidgans, Bernhard M.
name: Krause, Christian
name: Klimant, Ingo
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: 540 Chemie

description: Optical pH determination has the fundamental disadvantage of measuring a signal that depends on the ionic strength of the sample. The problem originates from the complex relationship between the proton activity and the concentration of the pH-sensitive dye. The effect of ionic strength on the signal depends on the charge of the indicator and its environment, e.g. the immobilisation matrix. We present novel lipophilic fluorescein esters carrying one negative charge. They are embedded in an uncharged, highly proton-permeable hydrogel to give optical pH sensors that show a negligible cross-sensitivity towards ionic strength. The fluorescent dyes differ in their substituents. This variation of substituents results in dissociation constants between 5.5 and 8.5. The indicators were made lipophilic by esterification of the carboxy group with a C18 alkyl chain. Since their spectral properties are quite similar, two indicators may be used in one sensor. This results in an optical pH sensor with a dynamic range that extends from pH 4.5 to 8.
Skin friction in zero-pressure-gradient boundary layers
Creators: name: yakhot, victor
Publisher: name: arXiv
Year: 2010
Subjects: subject: Fluid Dynamics (physics.flu-dyn)
subject: FOS: Physical sciences

description: A global approach leading to a self-consistent solution to the Navier-Stokes-Prandtl equations for zero-pressure-gradient boundary layers is presented. It is shown that as $Re_δ\rightarrow \infty$, the dynamically defined boundary layer thickness $δ(x)\propto x/\ln^{2}Re_{x}$ and the skin friction $λ=\frac{2τ_{w}}{ρU_{0}^{2}}\propto 1/\ln^{2}δ(x)$. Here $τ_{w}$ and $U_{0}$ are the wall shear stress and free stream velocity, respectively. The theory is formulated as an expansion in powers of a small dimensionless parameter $\frac{dδ(x)}{dx}\rightarrow 0$ in the limit $x\rightarrow \infty$.
Determination of picomolar concentrations of proteins using novel amino reactive chameleon labels and capillary electrophoresis laser-induced fluorescence detection
Creators: name: Craig, Douglas B.
name: Wetzl, Bianca K.
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Capillary electrophoresis; Chameleon dyes; Laser-induced fluorescence
subject: 540 Chemie

description: Py-1 and Py-6 are novel amino-reactive fluorescent reagents. The names given to them reflect that they consist of a pyrylium group attached to small aromatic moieties. Upon reaction with a primary amine there is a large spectral shift in the reagent, rendering them effectively fluorogenic. In this study, these reagents were used to label a test protein, (human serum albumin), and the sample was analyzed by capillary electrophoresis and laser-induced fluorescence detection. Detection limits after a 60 min labeling reaction at 22°C (Py-1) and 50°C (Py-6) were 6.5 ng/mL (98 pM) for Py-1 and 1.2 ng/mL (18 pM) for Py-6. Separation of immunoglobulin G (IgG), human serum albumin, lipase, and myoglobin after labeling with Py-6 were performed. The method was further modified to make it amenable to automation. Unlike many other amino reactive reagents used to label protein amino groups, reaction with Py-1 and Py-6 do not alter the charge of the protein and the advantage of this with respect to electrophoretic separations is discussed.
Remote atomic clock synchronization via satellites and optical fibers
Creators: name: Piester, D.
name: Rost, M.
name: Fujieda, M.
name: Feldmann, T.
name: Bauch, A.
Publisher: name: arXiv
Year: 2011
Subjects: subject: Instrumentation and Detectors (physics.ins-det)
subject: Optics (physics.optics)
subject: FOS: Physical sciences

description: In the global network of institutions engaged with the realization of International Atomic Time (TAI), atomic clocks and time scales are compared by means of the Global Positioning System (GPS) and by employing telecommunication satellites for two-way satellite time and frequency transfer (TWSTFT). The frequencies of the state-of-the-art primary caesium fountain clocks can be compared at the level of 10e-15 (relative, 1 day averaging) and time scales can be synchronized with an uncertainty of one nanosecond. Future improvements of worldwide clock comparisons will require also an improvement of the local signal distribution systems. For example, the future ACES (atomic clock ensemble in space) mission shall demonstrate remote time scale comparisons at the uncertainty level of 100 ps. To ensure that the ACES ground instrument will be synchronized to the local time scale at PTB without a significant uncertainty contribution, we have developed a means for calibrated clock comparisons through optical fibers. An uncertainty below 50 ps over a distance of 2 km has been demonstrated on the campus of PTB. This technology is thus in general a promising candidate for synchronization of enhanced time transfer equipment with the local realizations of UTC . Based on these experiments we estimate the uncertainty level for calibrated time transfer through optical fibers over longer distances. These findings are compared with the current status and developments of satellite based time transfer systems, with a focus on the calibration techniques for operational systems.
Time-resolved enzymatic determination of glucose using a fluorescent europium probe for hydrogen peroxide
Creators: name: Wu, Meng
name: Lin, Zhihong
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2004
Subjects: subject: Glucose - Europium - Fluorescent probe - Hydrogen peroxide - Time-resolved fluorescence
subject: 540 Chemie

description: An enzymatic assay for glucose based on the use of the fluorescent probe for hydrogen peroxide, europium(III) tetracycline (EuTc), is described. The weakly fluorescent EuTc and enzymatically generated H2O2 form a strongly fluorescent complex (EuTc–H2O2) whose fluorescence decay profile is significantly different. Since the decay time of EuTc–H2O2 is in the microseconds time domain, fluorescence can be detected in the time-resolved mode, thus enabling substantial reduction of background fluorescence. The scheme represents the first H2O2-based time-resolved fluorescence assay for glucose not requiring the presence of a peroxidase. The time-resolved assay (with a delay time of 60 mgrs and using endpoint detection) enables glucose to be determined at levels as low as 2.2 mgrmol L–1, with a dynamic range of 2.2–100 mgrmol L–1. The method also was adapted to a kinetic assay in order to cover higher glucose levels (mmol L–1 range). The latter was validated by analyzing spiked serum samples and gave a good linear relationship for glucose levels from 2.5 to 55.5 mmol L–1. Noteworthy features of the assay include easy accessibility of the probe, large Stokesrsquo shift, a line-like fluorescence peaking at 616 nm, stability towards oxygen, a working pH of approximately 7, and its suitability for both kinetic and endpoint determination.
DeepGraphDMD: Interpretable Spatio-Temporal Decomposition of Non-linear Functional Brain Network Dynamics
Creators: name: Turja, Md Asadullah
name: Styner, Martin
name: Wu, Guorong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Artificial Intelligence (cs.AI)
subject: Machine Learning (cs.LG)
subject: FOS: Computer and information sciences

description: Functional brain dynamics is supported by parallel and overlapping functional network modes that are associated with specific neural circuits. Decomposing these network modes from fMRI data and finding their temporal characteristics is challenging due to their time-varying nature and the non-linearity of the functional dynamics. Dynamic Mode Decomposition (DMD) algorithms have been quite popular for solving this decomposition problem in recent years. In this work, we apply GraphDMD -- an extension of the DMD for network data -- to extract the dynamic network modes and their temporal characteristics from the fMRI time series in an interpretable manner. GraphDMD, however, regards the underlying system as a linear dynamical system that is sub-optimal for extracting the network modes from non-linear functional data. In this work, we develop a generalized version of the GraphDMD algorithm -- DeepGraphDMD -- applicable to arbitrary non-linear graph dynamical systems. DeepGraphDMD is an autoencoder-based deep learning model that learns Koopman eigenfunctions for graph data and embeds the non-linear graph dynamics into a latent linear space. We show the effectiveness of our method in both simulated data and the HCP resting-state fMRI data. In the HCP data, DeepGraphDMD provides novel insights into cognitive brain functions by discovering two major network modes related to fluid and crystallized intelligence.
description: Published in MICCAI 2023
Quantum Natural Policy Gradients: Towards Sample-Efficient Reinforcement Learning
Creators: name: Meyer, Nico
name: Scherer, Daniel D.
name: Plinge, Axel
name: Mutschler, Christopher
name: Hartmann, Michael J.
Publisher: name: arXiv
Year: 2023
Subjects: subject: Quantum Physics (quant-ph)
subject: Machine Learning (cs.LG)
subject: FOS: Physical sciences
subject: FOS: Computer and information sciences

description: Reinforcement learning is a growing field in AI with a lot of potential. Intelligent behavior is learned automatically through trial and error in interaction with the environment. However, this learning process is often costly. Using variational quantum circuits as function approximators potentially can reduce this cost. In order to implement this, we propose the quantum natural policy gradient (QNPG) algorithm -- a second-order gradient-based routine that takes advantage of an efficient approximation of the quantum Fisher information matrix. We experimentally demonstrate that QNPG outperforms first-order based training on Contextual Bandits environments regarding convergence speed and stability and moreover reduces the sample complexity. Furthermore, we provide evidence for the practical feasibility of our approach by training on a 12-qubit hardware device.
description: Accepted to the 1st International Workshop on Quantum Machine Learning: From Foundations to Applications (QML@QCE 2023), Bellevue, Washington, USA. 6 pages, 4 figures, 1 table
SEpM 18: Lugal-nesaĝe-Enlil-massu (3.3.9)
Creators: name: Attinger, Pascal
Publisher: name: Zenodo
Year: 2019
Subjects: sumerian
Translation
Traduction

description: Traduction The Sumerian Epistolary Miscellany 18: Lugal-nesaĝe-Enlil-massu (3.3.9) Pascal Attinger, 2013, actualisé en 2019
Tattoos and Information: Mapping the Landscape of Tattoo Research
Creators: name: Krtalic, Maja
name: Campbell-Meier, Jennifer
name: Bell, Rachel
Publisher: name: Open Access Victoria University of Wellington | Te Herenga Waka
Year: 2022
Subjects: subject: 80703 Human Information Behaviour
subject: FOS: Media and communications

description: This paper is the initial discussion of a larger project Tattoo and Information, exploring tattoos as an information and communication phenomenon from multicultural perspectives and various use purposes. The overall purpose of the project is to provide insight into information seeking and experience in the context of tattoos to identify information literacy, visual literacy and cultural literacy skills as well as communications skills necessary for a successful tattoo experience in Aotearoa New Zealand. In this paper, we present findings from the literature review accompanied by preliminary insights from four interviews. The findings reflect thematic areas of research focusing on tattoos and gaps that exist. We used interviews to capture what topics emerge from tattoo narratives and whether they align with topics and gaps identified in the literature review. Based on the findings, we identify areas for future research.
Nonenzymatic Direct Assay of Hydrogen Peroxide at Neutral pH Using the Eu3Tc Fluorescent Probe
Creators: name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Hydrogen peroxide - europium - tetracycline - luminescence assay
subject: 540 Chemie

description: A detailed study is presented on the use of an easily accessible probe (the europium–tetracycline 3:1 complex; referred to as Eu3Tc) for determination of hydrogen peroxide (HP). Eu3Tc undergoes a 15-fold increase in luminescence intensity on exposure to an excess of HP. Data are given on the time dependence of the reaction, on the pH dependence of the absorption and emission spectra of both the probe and its complex with HP, and on the effect of stoichiometry between Eu3+ and Tc on selectivity and signal change. HP can be quantified in aqueous solution of pH 6.9 over a 2–400 μM concentration range with a limit of detection of 960 nM. The assay is validated using standard additions, and mean recoveries are found to be between 97.0 and 101.8%. Species that interfere in concentrations below 1 mM include phosphate, copper(II), fluoride and citrate. The addition of detergents causes the response curves towards HP to shift to higher HP concentrations. The method is critically assessed with respect to other common optical methods for determination of HP.