cometadata/datacite-rtg-text-other-reclassification-records huggingface dataset:
Effect of alternate stopbank alignments on the Waiho River, Westland, New Zealand : a microscale modelling investigation
Creators: name: Beagley, Rosemary Patricia Jane
Publisher: name: University of British Columbia
Year: 2017

description: The Waiho River in Westland, New Zealand has been rapidly aggrading its bed as a result of lateral confinement by a stopbank network which restricts the river to 30% of its natural fan accommodation space. The ongoing aggradation has prompted the need to repeatedly raise the crest level of the stopbanks. This had led to the bed and stopbank elevation reaching unpreceded and dangerously high levels, putting the surrounding land, infrastructure and Franz Josef community at even greater risk than before should the stopbanks fail. This thesis investigates an alternative solution to the current management practice. Using a microscale model it tests the response of an experimental Waiho River and fan to the removal of the Southern stopbank and replacement with two alternatives which allow the river greater access to its Southern fan surface. In addition, the study allowed for an exploration of several microscale modelling techniques. The results found that an experimental fan in a state of dynamic equilibrium would not aggrade when confined as previously thought. Only when the fan was already aggrading did it continue to aggrade when confined. In this instance, when the confinement was removed it did not result in degradation to lower elevations. Aggradation continued, albeit at a reduced rate. This suggests that the Waiho was already in a state of aggradation prior to human interference, and that confinement exacerbated the rate. This result has implications for the future management of the Waiho. If the current aggradation trend is to continue, then increasing stopbank crest height is not a viable solution, however releasing the river to the South will reduce the rate of aggradation as well as the pressures on the Northern stopbanks which protect the Franz Josef township. Effectively, this buys time for more drastic action (i.e. relocation of the township) to be taken. In addition to these results, the experiments found that measurement tools and model materials used previously in other microscale models produced unreliable fan behaviour and results. That they have failed in this study, motivates the need for further investigation into the underlying principles of microscale modelling and its practice.
Testing the Modified Ω-Model on the Hulse–Taylor Binary Pulsar (PSR B1913+16)
Creators: name: Brent Jarvis
Publisher: name: Zenodo
Year: 2025
Subjects: subject: Physics
subject: Physics
subject: Physics/methods
subject: Nuclear physics
subject: Particle physics
subject: Atomic physics
subject: Nuclear physics
subject: Quantum physics
subject: Theoretical physics

description: The Hulse–Taylor binary pulsar (PSR B1913+16) provides one of the most stringent tests of relativistic gravity. In the modified Ω-model, gravitational interactions emergefrom a dual-frequency spacetime curvature invariant, derived using torus geometry with a poloidal radius defined as r = c/f2, where c is the speed of light and f2 is the torsional frequency. We derive the effective invariant for a two-body system and postulate that the periastron precession per orbit is given by ∆ω = Ω/T, with appropriateeccentricity corrections. Using the well-measured parameters of PSR B1913+16, our analysis yields a predicted periastron precession rate of approximately 4.17◦/year, inexcellent agreement with the observed value of about 4.2◦/year. This result reinforces the robustness of the Ω-model in a strong-field regime.
Perovskanol, a new sesquiterpenoid with an unprecedented skeleton from Perovskia Abrotanoides
Creators: name: Karimzadeh, Seyedeh Masoomeh
name: Farimani, Mahdi Moridi
name: Amiri, Mohammad Sadegh
name: Tabefam, Marzieh
name: Alilou, Mostafa
name: Stuppner, Hermann
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Medicine
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: 69999 Biological Sciences not elsewhere classified

description: Phytochemical investigation of the aerial parts of Perovskia abrotanoides (Lamiaceae) by normal phase column chromatography resulted in the isolation of perovskanol (1), a novel sesquiterpenoid possessing a 5/7/5 fused carbon ring skeleton. The structure of 1 was established by comprehensive spectroscopic data analysis including 1 D and 2 D NMR and HRESIMS. The antiprotozoal activity of compound 1 was evaluated against Trypanosoma brucei rhodesiense, T. cruzi, Leishmania donovani, Plasmodium falciparum and no promising activities were shown against all parasite tested.
Silymarin from Silybum marianum by Naviglio's extractor: a new and very efficient approach
Creators: name: De Marco, Anna
name: Luongo, Giovanni
name: Di Marino, Cinzia
name: De Tommaso, Gaetano
name: Di Fabio, Giovanni
name: Zarrelli, Armando
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
subject: Biochemistry
subject: Space Science
subject: 29999 Physical Sciences not elsewhere classified
subject: FOS: Physical sciences
subject: Molecular Biology
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: FOS: Biological sciences
subject: Sociology
subject: FOS: Sociology
subject: 69999 Biological Sciences not elsewhere classified
subject: Plant Biology

description: The aim of this work is to compare new and traditional extraction methods to obtain silymarin from Silybum marianum, a biennial herbaceous plant of the Asteraceae family, present throughout the Mediterranean basin and used to treat several diseases. Silymarin primarily contains flavonolignans and flavonoids and is used in some pharmaceutical preparations to improve of liver function and as a protective against some hepatotoxins. In six extracts obtained by new and traditional extraction methods, the total contents of silymarin and its main flavonolignans, total phenols and condensed tannins were evaluated in addition to their respective antioxidant capacities. By the Naviglio extractor, that is a rapid solid-liquid dynamic extraction method, it is possible to obtain a fraction quantitatively more abundant than other methods, and with a lower content of tannins and phenolic compounds but with a higher content of flavonolignans, rare and expensive, and therefore easier to separate and purify.
A new phenolic acid from the wood of Mangifera gedebe
Creators: name: Nguyen, Hai Xuan
name: Nguyen, Loc Thanh
name: Van, Truong Nhat
name: Le, Tho Huu
name: Dang, Phu Hoang
name: Tran, Hung Manh
name: Nguyen, Nhan Trung
name: Nguyen, Mai Thanh Thi
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
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: Ecology
subject: FOS: Biological sciences
subject: 69999 Biological Sciences not elsewhere classified

description: From the methanol extract of the wood of Mangifera gedebe (Anacardiaceae), we had isolated a new secondary metabolite named gedebic acid (1) and six known compounds (2–7). Their chemical structures were determined by spectroscopic methods as well as comparing with data in the literature. All compounds were tested for α-glucosidase inhibitory activity. Compounds 4–7 showed more potent inhibitory activity, with IC50 values ranging from 45.3 to 142.6 μM, than that of a positive control acarbose (IC50, 214.5 μM).
Generalized adaptive smoothing based neural network architecture for traffic state estimation
Creators: name: Yang, Chuhan
name: Ambadipudi, Sai Venkata Ramana
name: Jabari, Saif Eddin
Publisher: name: arXiv
Year: 2023
Subjects: subject: Systems and Control (eess.SY)
subject: Computer Vision and Pattern Recognition (cs.CV)
subject: Machine Learning (cs.LG)
subject: FOS: Electrical engineering, electronic engineering, information engineering
subject: FOS: Computer and information sciences

description: The adaptive smoothing method (ASM) is a standard data-driven technique used in traffic state estimation. The ASM has free parameters which, in practice, are chosen to be some generally acceptable values based on intuition. However, we note that the heuristically chosen values often result in un-physical predictions by the ASM. In this work, we propose a neural network based on the ASM which tunes those parameters automatically by learning from sparse data from road sensors. We refer to it as the adaptive smoothing neural network (ASNN). We also propose a modified ASNN (MASNN), which makes it a strong learner by using ensemble averaging. The ASNN and MASNN are trained and tested two real-world datasets. Our experiments reveal that the ASNN and the MASNN outperform the conventional ASM.
Anisotropic resistivity tensor from disk geometry magneto-conductance
Creators: name: Vafek, Oskar
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: Magneto-transport measurements on two dimensional van der Waals heterostructures have recently shown signatures of uniaxial anisotropy. Such measurements are almost exclusively performed in a Hall bar geometry which makes it difficult to extract the full resistivity tensor. The goal of this paper is to theoretically analyze anisotropic magneto-conductance in a homogeneous disk geometry and to provide a closed form expression for the electrical potential anywhere on the disk if the current source and drain are located somewhere on the circumference. This expression can then be used to experimentally extract the full conductivity tensor, and by a simple inversion, the full resistivity tensor.
description: 7 pages, 2 figures (clarifications added)
Nonexistence of wave operators via strong propagation estimates for Schrödinger operators with sub-quadratic repulsive potentials
Creators: name: Ishida, Atsuhide
name: Kawamoto, Masaki
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mathematical Physics (math-ph)
subject: FOS: Physical sciences

description: Sub-quadratic repulsive potentials accelerate quantum particles and can relax the decay rate in the $x$ of the external potentials $V$ that guarantee the existence of the quantum wave operators. In the case where the sub-quadratic potential is $- |x|^α $ with $0< α< 2$ and the external potential satisfies $|V(x) | \leq C (1+|x|) ^{-(1- α/2) - \varepsilon} $ with $\varepsilon>0$, Bony et. al [3] determined the existence and completeness of the wave operators, and Itakura [12, 13, 14] then obtained their results using stationary scattering theory for more generalized external potentials. Based on their results, we naturally expect the following. If the decay power of the external potential $V$ is less than ${ -(1- α/2) } $, V is included in the short-range class. If the decay power is greater than or equal to ${ -(1- α/2) } $, $V$ is included in the long-range class. In this study, we first prove the new propagation estimates for the time propagator that can be applied to scattering theory. Second, we prove that the wave operators do not exist if the power is greater than or equal to $-(1- α/2)$ and that the threshold expectation of ${ -(1- α/2) } $ is true using the new propagation estimates.
Effects of suprathermal electrons on electron-acoustic instabilities
Creators: name: Guo, Ran
Publisher: name: arXiv
Year: 2022
Subjects: subject: Plasma Physics (physics.plasm-ph)
subject: Space Physics (physics.space-ph)
subject: FOS: Physical sciences

description: We study the electron-acoustic instabilities in plasmas with two kappa-distributed electrons and stationary ions. The instabilities are driven by the relative drift between two electron components. The suprathermal effects of different species on growth rates and instability thresholds are analyzed and compared by numerical calculations. The present study reveals that the suprathermal electrons with slow most probable speed play more important roles than the suprathermal ones with fast most probable speed. The former significantly reduces the instabilities and raises the instability thresholds. The parameters used in this study are inspired from the observations in Earth's magnetopause.
description: 12 pages, 6 figures, accepted by Frontiers in Astronomy and Space Sciences
Fluorescence imaging of the activity of glucose oxidase using a hydrogen-peroxide-sensitive europium probe
Creators: name: Wu, Meng
name: Lin, Zhihong
name: Schäferling, Michael
name: Dürkop, Axel
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Glucose oxidase; Enzyme imaging; Fluorescent probe; Time-resolved imaging; Enzyme activity assay
subject: 540 Chemie

description: A method for optical imaging of the activity of glucose oxidase (GOx) using a fluorescent europium(III) tetracycline probe for hydrogen peroxide is presented. A decay time in the microsecond range and the large Stokes shift of 210 nm of the probe facilitate intensity-based, time-resolved, and decay-time-based imaging of glucose oxidase. Four methods for imaging the activity of GOx were compared, and rapid lifetime determination imaging was found to be the best in giving a linear range from 0.32 to 2.7 mUnit/mL. The detection limit is 0.32 mUnit/mL (1.7 ng mL−1) which is similar to that of the time-resolved (gated) imaging using a microtiterplate reader. Fluorescent imaging of the activity of GOx is considered to be a useful tool for GOx-based immunoassays with potential for high-throughput screening, immobilization studies, and biosensor array technologies.
New Δ8,9-pregnene steroids isolated from the extremophile fungus Exophiala oligosperma
Creators: name: Santos, Alef dos
name: Rodrigues-Filho, Edson
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Space Science
subject: Microbiology
subject: FOS: Biological sciences
subject: Molecular 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: Ecology
subject: 69999 Biological Sciences not elsewhere classified
subject: 60506 Virology

description: Three pregnene steroids, two of them new, were isolated from ethyl-acetate partition of liquid-cultivation of the extremophyle fungus Exophiala oligosperma, found in a pH 1.5 hydrochloric acid aqueous solution. Spectroscopic studies using NMR and HRMS, allowed the identification of the molecular structures of both Δ8,9-pregnenes, still not described in the literature.
Phenolic profile by HPLC-ESI-MS/MS of six Brazilian Eugenia species and their potential as cholinesterase inhibitors
Creators: name: Tenfen, Adrielli
name: Vechi, Giovana
name: Cechinel-Zanchett, Camile Cecconi
name: Lorenzett, Thaís Savoldi
name: Reginato-Couto, Camila Esmério
name: Siebert, Diogo Alexandre
name: Vitali, Luciano
name: Micke, Gustavo
name: Klein-Júnior, Luiz Carlos
name: Filho, Valdir Cechinel
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: 69999 Biological Sciences not elsewhere classified
subject: 60506 Virology

description: Eugenia genus is known for its phenolic metabolites, which may influence the progression of the Alzheimer Disease. This study aimed to evaluate the anticholinesterase effects of six Eugenia species from Brazil. Leaves and stems were submitted to maceration (methanol) and partitioned with dichloromethane and ethyl acetate (EtOAc). Samples were screened (200 μg mL−1) for the inhibition of acetylcholinesterase (AChE) and butyrylcholinesterase (BuChE). HPLC-ESI-MS/MS analysis allowed the identification of twenty-eight phenolic compounds. Regarding the enzymatic activity, EtOAc fraction of E. mattosii exhibited the best results. Chemical and pharmacological aspects of seasonal E. mattosii extracts were evaluated. The extract from leaves collected in the winter was the most effective for AChE, and the extract from leaves collected in the spring was the most effective for BuChE. Correlating the enzymatic results with the chemical data, it was possible to associate these effects to isoquercitrin, quercetin, catechin, epicatechin, procatecuic acid and myricitrin content.
Rosa chinensis in vitro cell cultures: a phytocomplex rich of medium molecular weight polysaccharides with hydrating properties
Creators: name: Pressi, Giovanna
name: Bertaiola, Oriana
name: Guarnerio, Chiara
name: Barbieri, Elisa
name: Faggian, Marta
name: Carriero, Francesco
name: Semenzato, Alessandra
name: Dall’Acqua, Stefano
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
subject: Molecular Biology
subject: Biotechnology
subject: 39999 Chemical Sciences not elsewhere classified
subject: FOS: Chemical sciences
subject: Immunology
subject: FOS: Clinical medicine
subject: Developmental Biology
subject: Cancer
subject: Plant Biology
subject: FOS: Biological sciences
subject: 60506 Virology
subject: Computational Biology

description: In-vitro cell cultures of selected Rosa chinensis meristematic cells cultivated with an innovative CROP® (Controlled Release of Optimized Plants) platform, allowed obtaining a stable and standardized phytocomplex rich of medium molecular weight polysaccharides. The polysaccharides profile of the rose extract has been analysed with the size exclusion chromatography (HPLC-ELSD-SEC) both in the in vitro extract and in the dried petals of Rosa chinensis. The polysaccharides content in the extract was ≥20%, higher than in the dried petals. The 65–80% of total polysaccharides have a medium molecular weight (1000 Da), known for their moisturizing and anti-age properties. Reconstructed human epidermis in homeostatic conditions was used to evaluate its moisturizing action and the ability to maintain homeostasis. The Rosa chinensis extract increased the Aquaporin-3 expression and cell membrane localization and demonstrated to regulate hydration either in topical and systemic exposure.
Pre-Equilibrium Evolution of Conserved Charges with ICCING Initial Conditions
Creators: name: Carzon, Patrick
name: Martinez, Mauricio
name: Noronha-Hostler, Jacquelyn
name: Plaschke, Philip
name: Schlichting, Soeren
name: Sievert, Matthew
Publisher: name: arXiv
Year: 2023
Subjects: subject: Nuclear Theory (nucl-th)
subject: High Energy Physics - Phenomenology (hep-ph)
subject: Nuclear Experiment (nucl-ex)
subject: FOS: Physical sciences

description: Heavy-ion collisions can be well described through relativistic viscous hydrodynamics, but questions still remain when hydrodynamics is applicable because the initial state may begin very far-from-equilibrium. Thus, a pre-equilibrium evolution phase is used to bridge the gap between the initial state and hydrodynamics. K$ϕ$MP$ϕ$ST is one such pre-equilibrium model that propagates the energy-momentum tensor by decomposing it into the background and fluctuations around that background, whose evolution is captured by Green's functions. We extend this formalism to include conserved charges and calculate the corresponding non-equilibrium Green's functions in the relaxation time approximation. The ICCING algorithm initializes conserved charges in the initial state by sampling $g \rightarrow q\bar{q}$ splitting probabilities and is, thus, perfectly positioned to implement Green's functions for charge propagation. We show that this method alters the initial state charge geometries and is applicable in central to mid-central collisions.
description: 66 pages, 18 figures
Topological inverse band theory in waveguide quantum electrodynamics
Creators: name: Ke, Yongguan
name: Huang, Jiaxuan
name: Liu, Wenjie
name: Kivshar, Yuri
name: Lee, Chaohong
Publisher: name: arXiv
Year: 2023
Subjects: subject: Optics (physics.optics)
subject: Quantum Gases (cond-mat.quant-gas)
subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Topological phases play a crucial role in the fundamental physics of light-matter interaction and emerging applications of quantum technologies. However, the topological band theory of waveguide QED systems is known to break down, because the energy bands become disconnected. Here, we introduce a concept of the inverse energy band and explore analytically topological scattering in a waveguide with an array of quantum emitters. We uncover a rich structure of topological phase transitions, symmetric scale-free localization, completely flat bands, and the corresponding dark Wannier states. Although bulk-edge correspondence is partially broken because of radiative decay, we prove analytically that the scale-free localized states are distributed in a single inverse energy band in the topological phase and in two inverse bands in the trivial phase. Surprisingly, the winding number of the scattering textures depends on both the topological phase of inverse subradiant band and the odevity of the cell number. Our work uncovers the field of the topological inverse bands, and it brings a novel vision to topological phases in light-matter interactions.
description: Accepted for publication in Phys. Rev. Lett
Studies on essential oil from rose-scented geranium, Pelargonium graveolens L'Hérit. (Geraniaceae)
Creators: name: Fekri, Nermen
name: Amir, Dalia El
name: Owis, Asmaa
name: AbouZid, Sameh
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Genetics
subject: FOS: Biological sciences
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: Developmental Biology
subject: Plant Biology

description: Rose-scented geranium, Pelargonium graveolens L'Hérit. (Geraniaceae), is an economically important plant. GC-MS analysis of the essential oil, prepared by hydro-distillation from this plant species, showed the presence of iso-menthone (15.71%), epi-α-cadinol (15.49%), iso-menthol (6.46%), geranyl formate (6.22%), geraniol (6.16%) and citronellol (5.53%). The composition of the absolute prepared by solvent extraction was compared to that of the essential oil. Change in citronellol to geraniol ratio in the absolute was monitored during leaf development. Estimation of the ratio of the two compounds was carried out using 1H NMR spectroscopy. Geraniol content was highest in young leaves and citronellol content increased with increase in leaf age. Meta-analysis of the essential oil constituents reported from different countries was carried out. Menthone and isomenthone as well as citronellol and geraniol were negatively correlated. A significantly positive correlation was found between geraniol and linalool.
Fundamental Reference AGN Monitoring Experiment (FRAMEx) III: Radio Emission in the Immediate Vicinity of Radio Quiet AGNs
Creators: name: Shuvo, Onic I.
name: Johnson, Megan C.
name: Secrest, Nathan J.
name: Gliozzi, Mario
name: Fischer, Travis C.
name: Cigan, Phillip J.
name: Fernandez, Luis C.
name: Dorland, Bryan N.
Publisher: name: arXiv
Year: 2022
Subjects: subject: Astrophysics of Galaxies (astro-ph.GA)
subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences

description: We present follow-up results from the first Fundamental Reference AGN Monitoring Experiment (FRAMEx) X-ray/radio snapshot program of a volume-complete sample of local hard X-ray-selected active galactic nuclei (AGNs). Here, we added 9 new sources to our previous volume-complete snapshot campaign, two of which are detected in the 6 cm Very Long Baseline Array (VLBA) observations. We also obtained deeper VLBA observations for a sample of 9 AGNs not detected by our previous snapshot campaign. We recovered 3 sources with approximately twice the observing sensitivity. In contrast with lower angular resolution Very Large Array (VLA) studies, the majority of our sources continue to be undetected with the VLBA. The sub-parsec radio (6 cm) and X-ray (2-10 keV) emission show no significant correlation, with L_R/L_X ranging from 10^-8 to 10^-4, and the majority of our sample lies well below the fiducial 10^-5 relationship for coronal synchrotron emission. Additionally, our sources are not aligned with any of the proposed "fundamental" planes of black hole activity, which purport to unify black hole accretion in the M_BH-L_X-L_R parameter space. The new detections in our deeper observations suggest that the radio emission may be produced by the synchrotron radiation of particles accelerated in low luminosity outflows. Non-detections may be a result of synchrotron self-absorption at 6 cm in the radio core, similar to what has been observed in X-ray binaries (XRBs) transitioning from the radiatively inefficient state to a radiatively efficient state.
description: 18 pages, 9 figures; Accepted for publication in ApJ
Enantiomeric synthesis of natural alkylglycerols and their antibacterial and antibiofilm activities
Creators: name: Montoya, Deicy J. Fernández
name: Jordan, Luis A. Contreras
name: Moreno-Murillo, Bárbara
name: Silva-Gómez, Edelberto
name: Mayorga-Wandurraga, Humberto
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biophysics
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: 69999 Biological Sciences not elsewhere classified

description: Alkylglycerols (AKGs) are bioactive natural compounds that vary by alkyl chain length and degree of unsaturation, and their absolute configuration is 2S. Three AKGs (5l–5n) were synthesised in enantiomerically pure form, and were characterised for the first time together with 12 other known and naturally occurring AKGs (5a–5k, 5o). Their structures were established using 1H and 13C APT NMR with 2D-NMR, ESI-MS or HRESI-MS and optical rotation data, and they were tested for their antibacterial and antibiofilm activities. AKGs 5a–5m and 5o showed activity against five clinical isolates and P. aeruginosa ATCC 15442, with MIC values in the range of 15–125 µg/mL. In addition, at half of the MIC, most of the AKGs reduced S. aureus biofilm formation in the range of 23%–99% and P. aeruginosa ATCC 15442 biofilm formation in the range of 14%–64%. The antibiofilm activity of the AKGs assessed in this work had not previously been studied.
Optical ozone-sensing properties of poly(2-chloroaniline), poly(N-methylaniline) and polyaniline films
Creators: name: Ando, Masanori
name: Swart, Claudia
name: Pringsheim, Erika
name: Mirsky, Vladimir M.
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Optical ozone sensing; Poly(2-chloroaniline) film; Poly(N-methylaniline) film; Polyaniline film; Visible/near-IR absorbance change
subject: 540 Chemie

description: The ozone-sensitive visible/near-IR absorbance changes of poly(2-chloroaniline) (P(2ClANI)), poly(N-methylaniline) (P(NMeANI)) and polyaniline (PANI) films were investigated. These three polymer films, which were assumed to be present partially in a protonated form and partially in a reduced form, were prepared by chemical oxidation of the monomers followed by treatment with the reducing agent disodium disulfite. The P(2ClANI) film was sensitive to ozone at concentrations of down to 2.5 ppm, but saturation of sensitivity started to appear above 50 ppm. By contrast, the PANI and P(NMeANI) films were sensitive to ozone in a concentration range of 50–100 ppm without showing saturation of sensitivity.
A new p-terphenyl derivative from the fruiting bodies of Sarcodon imbricatus (L.) P. Karst
Creators: name: Zhang, Feng-Ming
name: Wang, Yue-Hu
name: Zhao, Ping
name: Yu, Fu-Qiang
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
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: Ecology
subject: FOS: Biological sciences
subject: Cancer
subject: Hematology
subject: Plant Biology
subject: 60506 Virology

description: A new p-terphenyl, 2',3'-diacetoxy-4,5,5',6',4'',5''-hexahydroxy-p-terphenyl (1), along with 12 known compounds were isolated from the fruiting bodies of Sarcodon imbricatus (Bankeraceae). Their structures were confirmed on the basis of extensive spectroscopic analysis and comparison with the spectral data in the literature. Compound 1 exhibited weak cytotoxicity against colon cancer SW480 and leukemia HL-60 cell lines, with IC50 values of 55.02 ± 1.79 μM and 44.71 ± 2.15 μM, respectively.
Exploring identity-as-narrative in the school narratives of Iranian university students in British Columbia, Canada
Creators: name: Amini, Negar
Publisher: name: University of British Columbia
Year: 2017

description: Based upon semi-structured interviews with 11 university students from Iran between 18 to 24 years of age at universities in Greater Vancouver, British Columbia, this research addressed a gap in the literature by documenting the narratives of participants’ school experiences in Iran and Canada. In addition, this research explored the construction of identities as the narratives we tell other people and confirmed by what others tell about us (Sfard & Prusak, 2005). Two main research questions guided this study: What narratives do participants tell of their school experiences? What narratives do participants tell of their actual and designated identities? The data was analyzed and interpreted following Braun and Clarke’s (2006) thematic analysis and informed by sociocultural theory (Wertsch, 1985). Five themes were identified: Ritual practices in establishing the school context and constructing identities; English language as a cultural tool in mediating identities; social relationships in shaping identities; and actual and designated identities. This study contributes to the literature by examining the educational experiences of Iranian immigrants to Canada. Implications for schools, along with limitations and suggestions for future research, are addressed in the conclusion.
Being in grief : a teacher’s autobiographical exploration of pedagogy in postcolonial India
Creators: name: Khanna, Reetika
Publisher: name: University of British Columbia
Year: 2017

description: In this thesis, grief is explored as a way of being in teaching. Drawing on Heidegger’s concept of Dasein, meaning presence or human existence, and informed by the autobiographical approach of currere, the author explores grief as an intergenerational phenomenon that occurs as a result of traumatic historical events (Partition 1947), profound personal loss (death of close family members), and the dehumanizing impact of postcolonial education in India. By relating and reflecting on stories from lived experiences, the author illustrates the ways in which the entanglements of family grief and national history can impact a child’s educational experience and a teacher’s practice. Through memory work, grief reveals itself as burdensome, a weight to be carried; practice is revealed as a site and source of grief. Invoking curriculum as ‘a complicated conversation,’ the study contends that being in grief is a reality to be embraced and discussed because of its impact on educational relationships. The significance of the thesis lies in acknowledging the intersection of the personal and the professional dimensions of teachers’ lives and the manner in which the associated emotions of grief and loss—shame, guilt, numbness, vulnerability, fear, and denial—are lived and worked out in and through pedagogy.
Screening Scheme Based on Measurement of Fluorescence Lifetime in the Nanosecond Domain
Creators: name: Höfelschweiger, Bianca K.
name: Pfeifer, Lutz
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Laser-induced fluorescence; lifetime; fluorescent label; affinity binding; affinity assay; decay time
subject: 540 Chemie

description: The authors demonstrate that the fluorescence lifetime of certain fluorescent labels is a useful parameter to detect affinity binding between biotin and streptavidin, as well as between biotinylated bovine serum albumin and streptavidin. The assay is performed in a microplate format, and lifetimes are determined using dye laser-induced fluorescence. Four fluorescent labels are presented that undergo a significant change in their lifetime upon affinity binding. The scheme, referred to as the fluorescence lifetime affinity assay, has several attractive features in that it requires single labeling only, represents a homogeneous assay, allows each of the 2 binding partners to be labeled, and is compatible with the standard microwell formats used in high-throughput screening.
title: Linkliste für die digital gestützte Lehre
title: Linklist for digital education
titleType: AlternativeTitle
Creators: name: Geurden, Bianca
Publisher: name: Universitätsbibliothek Siegen
Year: 2022
Subjects: subject: 370 Erziehung, Schul- und Bildungswesen
subject: Digitale Lehre
subject: Digitale Lehrveranstaltungen
subject: Planung Lehrveranstaltung
subject: Open Educational Resources Lehre
subject: OER Lehre
subject: Open Educational Resources
subject: Lehrmittel
subject: Hochschullehre

description: In dieser Linkliste finden Lehrende für Ihren Alltag Anregungen, Empfehlungen, Tipps und Lehr-Lernmaterialien zu Themen wie Forschendes Lernen, Künstlicher Intelligenz, Warm Ups oder technischen Umsetzungsmöglichkeiten via H5P oder Storyboardtools.
description: In this list of links, teachers will find suggestions, recommendations, tips and teaching materials for their everyday work on topics such as research-based learning, artificial intelligence, warm-ups or technical implementation options via H5P or storyboard tools.
Improved Routine Bio-Medical and Bio-Analytical Online Fluorescence Measurements Using Fluorescence Lifetime Resolution
Creators: name: Pfeifer, Lutz
name: Stein, Karsten
name: Fink, Ute
name: Welke, Alexander
name: Wetzl, Bianca
name: Bastian, Petra
name: Wolfbeis, Otto S.
Publisher: name: Universität Regensburg
Year: 2005
Subjects: subject: Time-resolved fluorescence - fluorescence lifetime - fluorescence assay - autofluorescence - metabolism
subject: 540 Chemie

description: Fluorescence techniques are widely used as sensitive detection methods in bio-analytics. The use of the bio-physical parameter fluorescence lifetime additional to the spectral characteristics of fluorescence has the potential to improve fluorescence-related detection methods in terms of selectivity in signal recognition, robustness against disturbing influences, and the accessibility of novel bio-chemical process parameters. This article describes the technical set up of a time-resolving instrument with either a fixed time-gated detection principle for improved evaluation of tissue metabolism by an online monitoring of the tissue autofluorescence or a direct fluorescence lifetime detection principle for lifetime-based fluorescent assays.
Sesquiterpenoids from Artemisia argyi and their NO production inhibitory activity in RAW264.7 cells
Creators: name: Xue, Gui-Min
name: Xue, Jin-Feng
name: Zhao, Chen-Guang
name: Zhao, Zhen-Zhu
name: Sun, Yan-Jun
name: Du, Kun
name: Li, Han-Wei
name: Feng, Wei-Sheng
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
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: Sociology
subject: FOS: Sociology
subject: Immunology
subject: FOS: Clinical medicine
subject: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Hematology

description: Investigation into the chemical diversity of Artemisia argyi led to the discovery of two new (1, 4) and four known (2-3, 5-6) sesquiterpenoids. The new structures were determined via extensive spectroscopic data, including IR, UV, MS, and NMR, and the absolute configurations of these compounds were elucidated by calculated ECD method. All isolates were tested for their inhibitory activity against NO production in RAW 264.7 macrophages, and the isolated sesquiterpenoids exhibited NO production inhibitory activity with IC50 values ranging from 1.91 to 36.52 μM.
Neuroprotective potential of new chromones isolated from the soil actinomycete Microbispora sp. TBRC6027
Creators: name: Kittisrisopit, Suchada
name: Bunbamrung, Nantiya
name: Thawai, Chitti
name: Tadtong, Sarin
name: Niemhom, Nantawan
name: Komwijit, Somjit
name: Rachtawee, Pranee
name: Pittayakhajonwut, Pattama
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Microbiology
subject: FOS: Biological sciences
subject: Cell Biology
subject: Neuroscience
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: Immunology
subject: FOS: Clinical medicine
subject: Cancer

description: Nine new chromone analogs (1–9) were isolated from the soil actinomycete Microbispora sp. TBRC6027. The chemical structures were determined based upon NMR spectroscopic methods. These compounds were evaluated in vitro by using P19-derived neurons for neuroprotective activity against oxidative stress induced by serum deprivation and showed % viability of neurons at the concentration of 1 ng/mL varied from 43.51% to 52.99% without significant neurotoxicity for P19-derived neurons at the same concentration. Moreover, all tested compounds were inactive for antibacterial activity against both Gram-positive and Gram-negative bacteria and for cytotoxicity against MCF-7 (human breast cancer) and Vero cells at maximum tested concentration 50 μg/mL. However, compounds 4, 6, and 7 displayed weak cytotoxicity against NCI-H187 (human small-cell lung cancer) cells with IC50 in a range of 87.99–91.57 μM.
Antiproliferative and antiviral activity of methanolic extracts from Sardinian Maltese Mushroom (Cynomorium coccineum L.)
Creators: name: Vascellari, Sarah
name: Zucca, Paolo
name: Perra, Daniela
name: Serra, Alessandra
name: Piras, Alessandra
name: Rescigno, Antonio
Publisher: name: Taylor & Francis
Year: 2019
Subjects: subject: Biochemistry
subject: Medicine
subject: Cell Biology
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: 69999 Biological Sciences not elsewhere classified
subject: FOS: Biological sciences
subject: Cancer
subject: Hematology
subject: Plant Biology
subject: 60506 Virology

description: Cynomorium coccineum is a non-photosynthetic plant that grows in Mediterranean countries and that is amply used in the traditional medicine. The aim of this study was to extend previous studies on the chemical and biological properties of C. coccineum, evaluating the potential antiviral and antiproliferative activity of the methanolic extract. The MTT assay was used for the in vitro cytotoxic studies against human cancer-derived cell lines, while both MTT and plaque reduction (PRT) methods were used to evaluate the potential inhibitory effect of the extract against a panel of mammal viruses. The results obtained showed no selective activity against any DNA and RNA virus but revealed an interesting antiproliferative activity against human leukaemia-derived cell lines.
Mid-life comparative field study investigating stormwater management between a permeable pavement and asphalt parking lot
Creators: name: Harvard, Michael Justin
Publisher: name: University of British Columbia
Year: 2017

description: As a result of increasing density in the built environment around our cities, there is an ever growing amount of effective impervious area (EIA) which in turn results in greater amounts of runoff due to rain events. While minimizing hard surfaces is a method to minimize EIA, it is not always practical. A common method to better manage stormwater has been the installation of permeable pavement in parking lots. This study investigated the efficacy of permeable pavements in a comparative study against asphalt, at a point 10 years after construction, with the goal of demonstrating the continued benefits to water quality and minimized runoff from the permeable pavement site. The field study, conducted in Burnaby, BC between two parking lots, yielded promising results which demonstrated that with routine maintenance, a permeable pavement system is able to continue minimizing downstream runoff for most types of rain storm events and is able to continue minimizing contaminant effluent concentrations of certain contaminants when compared to an asphalt site.
Generalized uniform covering maps relative to subgroups
Creators: name: LaBuz, B.
Publisher: name: arXiv
Year: 2010
Subjects: subject: Geometric Topology (math.GT)
subject: FOS: Mathematics
subject: 55P55, 54E15

description: In "Rips complexes and covers in the uniform category" \cite{Rips} the authors define, following James \cite{J}, covering maps of uniform spaces and introduce the concept of generalized uniform covering maps. Conditions for the existence of universal uniform covering maps and generalized uniform covering maps are given. This paper extends these results by investigating the existence of these covering maps relative to subgroups of the uniform fundamental group and the fundamental group of the base space.
Heavy Neutrinos and Lepton Number Violation in lp Colliders
Creators: name: Blaksley, Carl
name: Blennow, Mattias
name: Bonnet, Florian
name: Coloma, Pilar
name: Fernandez-Martinez, Enrique
Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Physics - Phenomenology (hep-ph)
subject: FOS: Physical sciences

description: We discuss the prospects of studying lepton number violating processes in order to identify Majorana neutrinos from low scale seesaw mechanisms at lepton-proton colliders. In particular, we consider the scenarios of colliding electrons with LHC energy protons and, motivated by the efforts towards the construction of a muon collider, the prospects of muon-proton collisions. We find that present constraints on the mixing of the Majorana neutrinos still allow for a detectable signal at these kind of facilities given the smallness of the Standard Model background. We discuss possible cuts in order to further increase the signal over background ratio and the prospects of reconstructing the neutrino mass from the kinematics of the final state particles.
description: 18 pages, 5 figures, REVTeX4
Coherent state transfer via highly mixed quantum spin chains
Creators: name: Cappellaro, Paola
name: Viola, Lorenza
name: Ramanathan, Chandrasekhar
Publisher: name: arXiv
Year: 2010
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: Spin chains have been proposed as quantum wires in many quantum information processing architectures. Coherent transmission of quantum information over short distances is enabled by their internal dynamics, which drives the transport of single-spin excitations in perfectly polarized chains. Given the practical challenge of preparing the chain in a pure state, we propose to use a chain that is initially in the maximally mixed state. We compare the transport properties of pure and mixed-state chains, finding similarities that enable the experimental study of pure-state transfer by its simulation via mixed-state chains, and demonstrate protocols for the perfect transfer of quantum information in these chains. Remarkably, mixed-state chains allow the use of Hamiltonians which do not preserve the total number of excitations, and which are more readily obtainable from the naturally occurring magnetic dipolar interaction. We propose experimental implementations using solid-state nuclear magnetic resonance and defect centers in diamond.
description: 9 pages
Number of propagating modes of a diffusive periodic waveguide in the semiclassical limit
Creators: name: Barra, Felipe
name: Maurel, Agnes
name: Pagneux, Vincent
name: Zuñiga, Jaime
Publisher: name: arXiv
Year: 2011
Subjects: subject: Quantum Physics (quant-ph)
subject: FOS: Physical sciences

description: We study the number of propagating Bloch modes N_B of an infinite periodic billiard chain. The asymptotic semiclassical behavior of this quantity depends on the phase-space dynamics of the unit cell, growing linearly with the wavenumber k in systems with a non-null measure of ballistic trajectories and going like ~ sqrt(k) in diffusive systems. We have calculated numerically N_B for a waveguide with cosine-shaped walls exhibiting strongly diffusive dynamics. The semiclassical prediction for diffusive systems is verified to good accuracy and a connection between this result and the universality of the parametric variation of energy levels is presented.
description: 8 pages, 8 figures
The best constant in a Hilbert-type inequality
Creators: name: Brevig, Ole Fredrik
Publisher: name: arXiv
Year: 2023
Subjects: subject: Classical Analysis and ODEs (math.CA)
subject: FOS: Mathematics

description: We establish that \[\sum_{m=1}^\infty \sum_{n=1}^\infty a_m \overline{a_n} \frac{mn}{(\max(m,n))^3} \leq \frac{4}{3}\sum_{m=1}^\infty |a_m|^2\] holds for every square-summable sequence of complex numbers $a = (a_1,a_2,\ldots)$ and that the constant $4/3$ cannot be replaced by any smaller number. Our proof is rooted in a seminal 1911 paper concerning bilinear forms due to Schur, and we include for expositional reasons an elaboration on his approach.
Anti-site defect-induced disorder in compensated topological magnet MnBi$_{2-x}$Sb$_x$Te$_4$
Creators: name: Lüpke, Felix
name: Kolmer, Marek
name: Yan, Jiaqiang
name: Chang, Hao
name: Vilmercati, Paolo
name: Weitering, Hanno H.
name: Ko, Wonhee
name: Li, An-Ping
Publisher: name: arXiv
Year: 2022
Subjects: subject: Mesoscale and Nanoscale Physics (cond-mat.mes-hall)
subject: FOS: Physical sciences

description: The gapped Dirac-like surface states of compensated magnetic topological insulator MnBi$_{2-x}$Sb$_x$Te$_4$ (MBST) are a promising host for exotic quantum phenomena such as the quantum anomalous Hall effect and axion insulating states. However, it has become clear that atomic defects undermine the stabilization of such quantum phases as they lead to spatial variations in the surface state gap and doping levels. The large number of possible defect configurations in MBST make studying the influence of individual defects virtually impossible. Here, we present a statistical analysis of the nanoscale effect of defects in MBST with $x=0.64$, by scanning tunneling microscopy/spectroscopy (STM/S). We identify (Bi,Sb)$_{\rm Mn}$ anti-site defects to be the main source of the observed doping fluctuations, leading towards the formation of nanoscale charge puddles and effectively closing the transport gap. Our findings will guide further optimization of this material system via defect engineering, to enable exploitation of its promising properties.