Temat: ions - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Environmentally and Economically Feasibility Manufacturing Process of Potassium Nitrate for Small Scale Industries: A Review
Autorzy:: Joshi, C. S.
Shukla, M. R.
Patel, K.
Joshi, J. S.
Sahu, O.
Powiązania:: https://bibliotekanauki.pl/articles/411997.pdf
Data publikacji:: 2015
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Chemical
discharge
ions
Salts
Waste
Opis:: Potassium Nitrate (PN) is of the basic need of chemical industry. With increase of demand in different production section of fertilizer, pharmaceutical, explosive, food industry etc, potassium nitrate the production becoming non economical to industry. The operating conditions and parameters are the main factors, which responsible for maximised the profits. The main aim of this study is to compared the production potassium nitrate in profitable as well as environmentally suitability way. From the literature different manufacturing process has been summarized for concluding this study.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2015, 41; 88-99
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: A new cyclotriveratrylene derivative as turn-off fluorescent probe with quinoline appended arm for the selective and sensitive determination of Cu2+ ions
Autorzy:: Fernandes, Patrick F.
Mishra, Divya R.
Powiązania:: https://bibliotekanauki.pl/articles/1030477.pdf
Data publikacji:: 2020
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: 8-quniolinesulfonyl chloride
Fluorescence studies
Sensors
copper ions
cyclotriveratrylene
Opis:: A novel supramolecular fluorescent molecular probe constructed on cyclotriveratrylene based derivative allied to 8-quinolinesulfonyl chloride (8QSC) was synthesized and used for the detection of copper ions among the various cations. Using 1H-NMR, 13C-NMR, and ESI-MS techniques the compound was successfully characterised. Furthermore the complexation behaviour of 8QSC-CTV with different cations were studied. A shift in the absorption spectra showed the detection of copper ion with the ligand 8QSC-CTV which concludes the strong binding interaction between the ligand and the cation. Furthermore the metal ion showed quenching in the emission spectra. The quantum yield of the metal complex was also studied. The stern volmer analysis concluded that the mechanism of fluorescence quenching is either purely dynamic or purely static.
Źródło:: World Scientific News; 2020, 144; 103-113
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Support for Eddington’s Number and His Approach to Astronomy: Recent Developments in the Physics and Chemistry of the Human Brain
Autorzy:: Persinger, M.A.
Powiązania:: https://bibliotekanauki.pl/articles/412066.pdf
Data publikacji:: 2013
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Sir Arthur Eddington
Photons and Membrane Ions
Consciousness and Photon Emissions
Eddington Number
Opis:: The astronomical contributions of Sir Arthur Eddington have sometimes been distracted by his philosophy and his derivation of ~1079 for the total number of elementary particles in the universe. However, assumptions employed to obtain the universal mass in a volume of ~1079 m3 produce values remarkably commensurate with ~1079 protons. The congruence between the calculated gravitational forces for rest mass photons separated by Planck’s length and potassium ions separated by the distance that maintains a neuron’s resting plasma membrane potential is also consistent with his assumption that universal structure is mirrored within consciousness and its extensions through sensitive instrumentation. Recent measurements of photon emissions during changes in membrane potentials and human beings engaging in visual imagery as well as the concept of entanglement suggest that careful reevaluation of Eddington’s approach in cosmology, astronomy, and astrophysics may be revealing.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2013, 8, 1; 8-19
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Study on Halide Ions Selectivity of Industrial Grade Anion Exchange Resin Auchlite A-378
Autorzy:: Singare, P. U.
Patange, A. N.
Powiązania:: https://bibliotekanauki.pl/articles/412220.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: selectivity
ion exchange reactions
halide ions
industrial grade resins
anion exchange resins
enthalpy
equilibrium constant
Auchlite A-378
Opis:: The thermodynamic approach was applied to predict the trend selectivity of industrial grade anion exchange resin Auchlite A-378 in chloride form towards iodide and bromide ions in the solution. The study was conducted by performing the Clˉ/Iˉ and Clˉ/Brˉ uni-univalent ion exchange reactions under gradually increasing temperature conditions. The thermodynamic equilibrium constants K values were used to calculate the enthalpies of the two uni-univalent ion exchange reactions. It was observed that the K values for Clˉ/Iˉ ion exchange reaction were higher than Clˉ/Brˉ exchange reaction under identical experimental conditions. Also the enthalpy values for the two uni-univalent ion exchange reactions were calculated as -39.51 and -18.38 kJ/mol respectively. The high K and low enthalpy values obtained for Clˉ/Iˉ ion exchange reaction is responsible for higher selectivity of the resin towards iodide ions as compared to that towards bromide ions, when both the ions are present in the same solution.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 44-50
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Study on Halide Ions Selectivity of Nuclear Grade Anion Exchange Resin Auchlite ARA-9366
Autorzy:: Singare, P. U.
Patange, A. N.
Powiązania:: https://bibliotekanauki.pl/articles/412305.pdf
Data publikacji:: 2014
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: selectivity
ion exchange reactions
halide ions
nuclear grade resins
anion exchange resins
enthalpy
equilibrium constant
Auchlite ARA-9366
Opis:: The selectivity behaviour of nuclear grade anion exchange resin Auchlite ARA-9366 in chloride form towards iodide and bromide ions in the solution was studied. The trend in selectivity of the resin was predicted on the basis of thermodynamics of Clˉ/Iˉ and Clˉ/Brˉ uni-univalent ion exchange reactions. It was observed that the equilibrium constants K values for Clˉ/Iˉ ion exchange reaction were higher than that calculated for Clˉ/Brˉ exchange under identical experimental conditions. Also the enthalpy values for the two uni-univalent ion exchange reactions were calculated as -47.87 and -36.14 kJ/mol respectively. The high K and low enthalpy values obtained for Clˉ/Iˉ ion exchange reaction as compared to that obtained during Clˉ/Brˉ exchange supports higher selectivity of the resin towards iodide ions as compared to that towards bromide ions, when both the ions are present in the same solution.
Źródło:: International Letters of Chemistry, Physics and Astronomy; 2014, 11, 1; 67-73
2299-3843
Pojawia się w:: International Letters of Chemistry, Physics and Astronomy
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The Biomass of the Earth as the Direct Energy-Mass Equivalence from ~3.5 Billions of Years of Solar Flux
Autorzy:: Persinger, Michael A.
Powiązania:: https://bibliotekanauki.pl/articles/1188089.pdf
Data publikacji:: 2016
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: global biomass
solar photons
mass-energy equivalence
entanglement
excess correlation hydronium ions
ultraweak bioluminescence
Popp photons
Cosic resonance
Opis:: Life is considered to be quantitative phenomena based upon principles derived from Astronomy, Physics, and Chemistry. The mass equivalence of the total energy from the Sun that occurred over the terrestrial surface from 3.5 billions ago to present is within the range of empirical estimations for the total biomass on the Earth. If the mass of living systems is the converted photon energy integrated over time then the ubiquitous emissions of photons in the order of picoWatts per square meter may not be a metabolic artifact but a reflection of the matter’s origin. Quantification demonstrates this magnitude of photon flux density is an expected dissipation from the photon-mass conversion that defines living systems. Because all energy, particularly photons, within Life on this planet originated from the Sun their maintenance as Popp (virtual) photons creates the conditions for non-local effects between solar activity and Life. The occurrence of entanglement between solar-terrestrial photons could alter the models, mechanisms, and attributions for the persistent and multiple correlations between solar activity and the phenomena measured within various levels of discourse from physical chemistry to large groups of organisms.
Źródło:: World Scientific News; 2016, 56; 110-120
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Anticancer Activities of Ferrous and Ferric Ions in Progression, Proliferation, Angiogenesis, Invasion and Metastasis against Cancer and Tumor Cells
Autorzy:: Ishida, Tsuneo
Powiązania:: https://bibliotekanauki.pl/articles/1112780.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Angiogenesis
Cancer and tumor cell death
Ferritin
Ferroptosis
Ferrous and ferric ions
Invasion and metastasis
Iron deficiency and overload
ROS
Opis:: The process of ferroptotic death is characterized by the overwhelming, iron-depending accumulation of lethal lipid ROS. Unlike other forms of apoptotic and non-apoptotic death, this requirement for ROS accumulation appears to be universal. Redox cycling is a characteristic of transition metals such as iron (Ferritin Fe3+ ⇄ Ferrous Fe2+). Iron via the Fenton reaction can exacerbate the consequences of hydrogen peroxide (H2O2) production, leading to the generation of hydroxyl radicals. The superoxide ion can participate in regenerating ferrous iron that is required for the Fenton reaction. An excess of iron is toxic due to its ability to engage in redox cycling and promote free radical formation. Super oxide anion generation; O2 → ･O2－. Hydrogen peroxide production; ･O2－ + 2H+ + e- → H2O2. Haber-Weiss reaction; H2O2 + O2－ → ･OH + OH－ + O2. Fenton reaction; Fe2+ + H2O2 → Fe3+ + OH－ + ･OH. Reduction to Fe(Ⅱ); Fe3+ ＋･O2－ → Fe2+ + O2. Ferritin is stable in iron-rich conditions, whereas it is rapidly degraded under conditions of iron starvation and ferritin degradation can be led. New blood vessel formation in angiogenesis is fundamental to tumor growth, invasion, and metastatic dissemination. Iron deficiency will lead to the dysfunction of immune system, metabolic disorders, myasthenia and anemia, whereas, excess iron also damages several vital organs. Thus, iron is essential for multiple cell functions, but is also potentially deleterious reasons of its ability to generate free oxygen radicals, iron balance by continuously recycling and reusing cellular iron, storage in ferritin, and export through ferroportin protecting cells from free iron toxicity. However. the exact molecular mechanism involved on iron imbalance in development for tumor cells and the iron overload-mediated induction of apoptosis are required to be explored in future.
Źródło:: World News of Natural Sciences; 2018, 17; 111-129
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Improvement of plant heat tolerance by modification of xanthophyll cycle activity
Autorzy:: Trojak, Magdalena
Skowron, Ernest
Powiązania:: https://bibliotekanauki.pl/articles/1178460.pdf
Data publikacji:: 2017
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: ascorbic acid (AsA);
calcium ions (Ca2+)
dithiothreitol (DTT)
heat stress
plant protection products (PPPs)
putrescine (Put)
xanthophyll cycle
Opis:: Plants are sessile organisms hence environmental factors such as excessive light and high air temperature lead to significant reductions of their productivity and quality of gained yield. In fact, scientific and agriculture hubs make lots of efforts to improve crop tolerance to elevated temperature, selecting more tolerant varieties. We analyzed less expensive and highly efficient method to improve resistance of well-known cultivars of crop plant by reversible modification of xanthophyll cycle. It functions as a safety valve to adjust energy transfer and protects fragile structures of photosynthetic machinery from excessive light, especially accompanied by heat or water stress. Efficiency of modified xanthophyll cycle activity was measured after pre-treatment with four, chemically different regulators, with or without light illumination. Analyses were carried out on barley (Hordeum vulgare L.) cv. Zenek treated with ascorbic acid (AsA), dithiothreitol (DTT), putrescine (Put) and calcium ions (Ca2+). To measure the scale of thermal energy dissipation we traced energy transfer absorbed by PSII with PAM chlorophyll fluorescence technique. Results showed clear correlation between AsA (activator of violaxanthin de-epoxidase) treatment and stimulation of the Φ(NPQ) at increased temperature. DTT (inhibitor of violaxanthin de-epoxidase) decreased the cycle activity at 45 °C at the same time increasing its value at 35°C, caused by interaction with other enzymes. Action of Put (hydrogen ions buffer) concerned mainly a non regulated Φ(NO) energy quenching. We noticed that application of Ca(NO3)2 (Ca2+ source for enzyme activity) reduced the Φ(NPQ) at 45 °C and stimulated it at 25 °C. Obtained results confirmed postulated possibility of creating new type of plant protection products (PPPs) able to precisely manage natural mechanisms of heat resistance.
Źródło:: World Scientific News; 2017, 70, 2; 51-70
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 9.

Tytuł:: Antiviral Activities of Cu2+ Ions in Viral Prevention, Replication, RNA Degradation, and for Antiviral Efficacies of Lytic Virus, ROS-Mediated Virus, Copper Chelation
Autorzy:: Ishida, Tsuneo
Powiązania:: https://bibliotekanauki.pl/articles/1177808.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Capsid protein
Copper chelation
Copper homeostasis
Copper oxide nanoparticles
Cu2+ and Cu1+ ions
DNA/RNA virus
HSV
ROS
Viral replication
mRNA degradation or decay
Opis:: Copper has been known for decades that marked changes of micronutrient homeostasis in the host are accompanied by infection or inflammation. Copper levels in the serum are significantly elevated in response to inflammation that copper accumulates at sites of inflammation. Easily oxidized copper oxide nanoparticles (CuONPs) are widely used as catalysts that the ability of CuONPs to reduce bacterial population and virus application is enhanced. The mechanism of copper-mediated inactivation of herpes simplex virus (HSV) is by which cupric ions oxidatively damage biomolecules. Virus-mediated subjugation and modulation of host lipids during infection that the life cycle of most viruses proceeds through a series of basic steps: binding and internalization, fusion, uncoating, of the viral genome, its replication, assembly of new particles, and budding or release of the newly made viruses. The HIV-1 protein Vpu is an 81-amino-acid (16-kDa) type I which the presence of Vpu leads to the degradation of BST-2 via an endosome-lysosome degradation pathway. Oxidative degradation by a Cu-metalloenzyme, and ubiquitin-mediated degradation of cellular proteins were exploited. Copper can disrupt the lytic cycle of the Coccolithovirus. Lysins represent a novel class of anti-infectives derived from bacteriophage which lysins are bacterial cell wall hydrolytic enzymes that selectively and rapidly kill specific bacteria. Regarding copper induced cellular toxicity, several mechanisms have been proposed based on the formations of ROS by free Cu ions as cupric and cuprous ions can participate in redox reactions. ROS (O2ˉ,･OH, OHˉ), Cu+ and H2O2 play the important roles for viral inactivations. Thujaplicin-copper chelates inhibit influenza virus-induced apoptosis. Pyrrolidine dithiocarbamate as a metal ion binding agent inhibits the activity of the viral proteases of polyprotein processing and RNA replication of HRV. Chelation enables metals are capable of ligand scavenging via complexation, since reverse transcriptase enzyme inhibits the growth and replication of RNA tumor viruses. Thus, copper complex and copper chelation enhance antiviral efficacy.
Źródło:: World Scientific News; 2018, 99; 148-168
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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