Search results for "abs"
showing 10 items of 6504 documents
Silver Sulfide Nanoclusters and the Superatom Model
2015
The superatom model of electron-shell closings has been widely used to explain the stability of noble-metal nanoclusters of few nanometers, including thiolate-protected Au and Ag nanoclusters. The presence of core sulfur atoms in silver sulfide (Ag–S) nanoclusters renders them a class of clusters with distinctive properties as compared to typical noble-metal clusters. Here, it is natural to ask whether the superatom model is still applicable for the Ag–S nanoclusters with mixed metal and nonmetal core atoms. To address this question, we applied density functional simulations to analyze a series of Ag–S nanoclusters: Ag14S(SPh)12(PPh3)8, Ag14(SC6H3F2)12(PPh3)8, Ag70S16(SPh)34(PhCO2)4(triphos…
Design, Synthesis and Evaluation of Fluorescent Analogues of Abscisic Acid
2020
A fluorescent analogue of abscisic acid has been prepared by combining (S)‐abscisic acid (ABA) with nitrobenzoxadiazole (NBD) fluorophore using ethanol amine as a linker. Isomerization of the double bond at the side chain of abscisic acid happened during the synthesis. The resulting fluorophore analogues derived from both isomeric compounds entered cells suggesting a wide applicability of the ABA‐NBD conjugates as fluorescent probes to study ABA mechanism of action. The functional properties of the isomeric ABA‐NBD conjugates were tested in vitro, by measuring TNFα expression and nitrite concentration in LPS‐stimulated macrophages and compared with their non‐fluorescent ABA isomers. Rationa…
Examining Open Innovation in Science (OIS): what Open Innovation can and cannot offer the science of science
2021
Scholars across disciplines increasingly hear calls for more open andcollaborative approaches to scientific research. The concept of OpenInnovation in Science (OIS) provides a framework that integratesdispersed research efforts aiming to understand the antecedents,contingencies, and consequences of applying open and collaborativeresearch practices. While the OIS framework has already been taken upby science of science scholars, its conceptual underpinnings requirefurther specification. In this essay, we critically examine the OIS conceptand bring to light two key aspects: 1) how OIS builds upon OpenInnovation (OI) research by adopting its attention to boundary-crossingknowledge flows and by…
Volume preserving mean curvature flows near strictly stable sets in flat torus
2021
In this paper we establish a new stability result for the smooth volume preserving mean curvature flow in flat torus $\mathbb T^n$ in low dimensions $n=3,4$. The result says roughly that if the initial set is near to a strictly stable set in $\mathbb T^n$ in $H^3$-sense, then the corresponding flow has infinite lifetime and converges exponentially fast to a translate of the strictly stable (critical) set in $W^{2,5}$-sense.
UV filters: From sunscreens to human body and the environment
2007
Recognition of the harmful effects of ultraviolet (UV) radiation on the skin has triggered development of organic chemicals (commonly referred as UV filters) that can absorb UV radiation and attenuate the negative effects of sunlight exposure. Depending on the properties and the intended degree of protection, a wide array of combinations is being marketed as delivering protection against most kinds of UV-induced skin damage. However, some UV filters have dermatological implications, so maximum applicable concentrations have been established. To monitor to what extent commercial products comply with the mandatory limits, several analytical methods have been used for their determination in co…
Interpretacions i aplicacions del pactisme polític a la València dels Austries. L'activitat de la Junta de Contrafurs i l'observança de les lleis (16…
2022
Aquest treball aborda un dels temes centrals del pactisme polític, l'observança i l'obligació d'obeir les lleis contractades entre el rei i el regne. Tot el sistema polític del regne de València girava al voltant de la idea d'un pacte o contracte mitjançant el qual el rei es comprometia a governar justament i segons les lleis mentre que els tres Braços o Estaments, Eclesiàstic, Militar i Reial, es comprometien a nom del regne a ser fidels i lleials vassalls. Segons aquest tracte, sembla evident que el monarca i els seus oficials estaven obligats a governar i administrar justícia segons les lleis del regne, no obstant, la doctrina jurídica es va preocupar per definir una sèrie de circumstànc…
Dziecko w roli rodzica – pomylone role rodzinne. O parentyfikacji w doniesieniach światowych i polskich
2018
Cel. Celem artykułu, o charakterze przeglądowym, jest wyjaśnienie zjawiska parentyfikacji, jej uwarunkowań i konsekwencji z nią związanych. Parentyfikacja najczęściej określana jest jako odwrócona rola w rodzinie i dotyczy zamiany roli między rodzicem a dzieckiem. Dochodzi do niej wówczas gdy rodzic, częściowo lub całkowicie rezygnuje ze swoich zadań i obowiązków rodzicielskich. Abdykacja rodzica uruchamia proces parentyfikacji, w którym zwykle jedno, najczęściej najstarsze dziecko w rodzinie, czuje się oddelegowane do przejęcia roli rodzicielskiej, w różnych sferach życia rodzinnego. Świadoma pomoc i obowiązki mogą mieć charakter instrumentalny lub emocjonalny. Dziecko poddane procesowi pa…
Open-source QCD analysis of nuclear parton distribution functions at NLO and NNLO
2019
We present new sets of nuclear parton distribution functions (nPDFs) at next-to-leading order (NLO) and next-to-next-to-leading order (NNLO). Our analyses are based on deeply inelastic scattering data with charged-lepton and neutrino beams on nuclear targets. In addition, a set of proton baseline PDFs is fitted within the same framework with the same theoretical assumptions. The results of this global QCD analysis are compared to existing nPDF sets and to the fitted cross sections. Also, the uncertainties resulting from the limited constraining power of the included experimental data are presented. The published work is based on an open-source tool, xFitter, which has been modified to be ap…
Biological Monitoring Using Lichens as a Source of Information About Contamination of Mountain with Heavy Metals
2022
Abstract The aim of this study was passive biomonitoring of the mountains of southern Poland. Lichens Hypogymnia physodes were used for the study. Concentrations of the heavy metals Ni, Cu, Zn, Cd and Pb were determined in these lichens. The concentrations were measured by atomic absorption spectrometry (AAS). The analysis of the concentrations of the determined heavy metals in the lichen thallus allowed to determine the places with the highest and the lowest contamination with a given heavy metal in the study area. It was shown that the area of Great Czantoria and Big Soszow is the most contaminated with heavy metals among the investigated areas. The study shows that the transport of analy…