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Wyświetlanie 1-15 z 21
Tytuł:
How to Plot the H-R Diagram and Use its Applications
Autorzy:
Sadatian, S. Davood
Powiązania:
https://bibliotekanauki.pl/articles/1190146.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
H-R diagram
Red shift
Luminosity
Opis:
In this study, we sought to explain how the stars who due to their physical features classified. In following, we explain more of what outcomes can be extracted category. However, we must consider that the physical characteristics of stars, clusters of stars in the universe will have an important role in finding distribution patternof stars
Źródło:
World Scientific News; 2016, 42; 132-142
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A facile and efficient protocol for the synthesis of polyfunctionalized 4H-pyran derivatives and its antimicrobial evaluation
Autorzy:
Lunagariya, Kaushikkumar
Gohel, Jyoti
Pambhar, Kaushik
Khunt, Ranjan
Powiązania:
https://bibliotekanauki.pl/articles/1076138.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4H-Pyran
Antimicrobial
NMSM
Thiophene
Opis:
A series of novel 4H-pyran derivatives containing thiophene were designed and synthesized via Domino Knoevenagel condensation–Michael addition–intramolecular O-cyclization sequence in a clean, efficient and straight forward manner. Characterizations of synthesized compounds were done by various spectroscopic techniques like IR, NMR and Mass spectrometry. All synthesized compounds have been screened against four anti-bacterial and two anti-fungal species. Among synthesized compound, no one is relatively active against antimicrobial.
Źródło:
World Scientific News; 2019, 116; 91-101
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
C-compactness Via Grills
Autorzy:
Gupta, M. K.
Gaur, Monika
Powiązania:
https://bibliotekanauki.pl/articles/1159576.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
C-compact
G-compact
Grill
Quasi-H-closed
Opis:
In the present paper, we study C-compactness with respect to a grill, which simultaneously generalizes C-compactness and G-compactness and term it as C(G)-compact space. Several of its properties are investigated and effects of various kinds of functions on them are studied.
Źródło:
World Scientific News; 2018, 113; 130-137
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Greener, facile and ultrasound assisted synthesis of 1,2,3-triazole via CuAAC of 2-(azidomethyl)-1H-benzo[d]imidazole and alkynes and their evaluation of antimicrobial activity
Autorzy:
Kapupara, Vimalkumar H.
Kalavadiya, Prakash L.
Gojiya, Dinesh G.
Parmar, Nilesh D.
Joshi, Hitendra S.
Powiązania:
https://bibliotekanauki.pl/articles/1075696.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
1
1H-benzo[d]imidazole azide
2
3-triazol-1-yl)methyl)-1H-benzo[d]imidazole
3-triazole via CuAAC
4-disubstituted 1H-1
alkynes
antimicrobial
copper(I) catalyst
Opis:
An expeditious room temperature protocol for the synthesis of 1,4-disubstituted 1H-1,2,3-triazol-1-yl)methyl)-1H-benzo[d]imidazole from [3+2] cyclization by using 1H-benzo[d]imidazole azide and various substituted terminal alkynes and copper(I) as a catalyst. This synthetic approach has been various prominent features such as fewer reaction steps, Good Yield, simple reaction condition and no any further purification required. Characterizations of all the synthesized compounds were done by various spectroscopic techniques like FT-IR, NMR and Mass spectrometry. All the synthesized targeted compounds were screened and evaluated for their antimicrobial activities.
Źródło:
World Scientific News; 2019, 119; 139-167
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Pandemic Influenza Threat
Autorzy:
Kaudhry, Harish
Fangriya, Ruchita
Powiązania:
https://bibliotekanauki.pl/articles/1194041.pdf
Data publikacji:
2015
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
H5N1
human influenza
pandemic influenza
threat
Opis:
The threat of a human influenza pandemic has greatly increased over the past several years with the emergence of highly virulent avian influenza viruses, notably H5N1 viruses, which have infected humans in several Asian and European countries. Previous influenza pandemics have arrived with little or no warning, but the current widespread circulation of H5N1 viruses among avian populations and their potential for increased transmission to humans and other mammalian species may afford us an unprecedented opportunity to prepare for the next pandemic threat. The US Department of Health and Human Services is coordinating a national strategy to respond to an influenza pandemic that involves multiple agencies, including the Centers for Disease Control and Prevention, the Food and Drug Administration, and the National Institutes of Health (NIH). Within NIH, the National Institute of Allergy and Infectious Diseases (NIAID) conducts basic and clinical research to develop new vaccine technologies and antiviral drugs against influenza viruses. We describe recent research progress in preparing for pandemic influenza.
Źródło:
World Scientific News; 2015, 11; 80-96
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Overview of Military Operations of US Arms Forces During the First Gulf War
Autorzy:
Wierzbicki, Sławomir
Mazurczak, Przemysław
Powiązania:
https://bibliotekanauki.pl/articles/1179693.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
George H. Bush
Gulf War
Iraq
Saddam Hussein
US Forces
Opis:
The purpose of this papers is analysis for military actions conducted by US Arms Force during Desert Storm operation in Iraq. This concern gives insight into new US attempt for military operations outside national borders following conclusions from unsuccessful military campaign in Vietnam. After 1989, US made more brave political decisions for participation in solving worldwide concerns. Origin for such state of affairs was gradual “Soviet Imperium breakdown”, that was general challenge for American foreign policy and safety. The United States began introducing New World Order vision in last decade of the twentieth century, that was created by G.H. Bush. American army obtained the role of executor in the performance of settled assumptions. The first military test was Saddam Hussein and Iraq.
Źródło:
World Scientific News; 2017, 72; 242-247
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Porous PEO coatings on titanium, obtained under DC regime, enriched in magnesium, calcium, zinc, and copper
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1156239.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
plasma electrolytic oxidation (peo)
micro arc oxidation (mao)
cp titanium grade 2
calcium nitrate ca(no3)2•4h2o
magnesium nitrate mg(no3)2∙6h2o
zinc nitrate zn(no3)2∙6h2o
copper nitrate cu(no3)2∙3h2o
Opis:
In the present paper, the analysis of SEM and EDS results of porous and enriched in calcium, magnesium, zinc, copper and phosphorus coatings, obtained during 3-minute treatments performed by Plasma Electrolytic Oxidation (PEO)/Micro Arc Oxidation (MAO) processes on CP Titanium Grade 2, is presented. The PEO process was carried out at DC potentials of 500 VDC, 575 VDC, and 650 VDC in electrolytes containing 125 g Ca(NO3)2•4H2O, and 125 g Mg(NO3)2∙6H2O, and 125 g Zn(NO3)2∙6H2O, and 125 g Cu(NO3)2∙3H2O in 1 L H3PO4. It was found that obtained coatings have pores with different shapes and diameters and/or size/dimentions. The Ca/P, Mg/P, Zn/P, Cu/P, and M/P ratios (M=Ca+Mg+Zn+Cu) were equal to 0.074, 0.046, 0.056, 0.042, and 0.218, respectively. The highest value of each of these ratios was recorded for 650 VDC. It may be concluded that the obtained PEO coatings structures most likely are similar to hydroxyapatite-like structures, in which the Ca2+ may be replaced with Zn2+, Mg2+, Cu2+.
Źródło:
World Scientific News; 2018, 94, 2; 99-114
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SEM and EDS studies of selected porous coatings obtained on titanium by Plasma Electrolytic Oxidation
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Malorny, Winfried
Powiązania:
https://bibliotekanauki.pl/articles/1178480.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate Ca(NO3)2∙4H2O
copper nitrate Cu(NO3)2∙3H2O
magnesium nitrate Mg(NO3)2∙6H2O
Opis:
In present work, SEM and EDS results of porous and enriched in calcium, copper, magnesium and phosphorus coatings, which were obtained during 3-minute treatments of Plasma Electrolytic Oxidation PEO (Micro Arc Oxidation MAO) processes on CP Titanium Grade 2 at two potentials, i.e. 500 VDC and 650 VDC, are presented. It was found that the voltage of that process influences the chemical composition of coatings shapes obtained on titanium in electrolytes containing calcium, copper and magnesium nitrates. The pores shapes of PEO coatings formed on titanium in electrolytes containing calcium, copper and magnesium nitrates are presented, too. In addition, it was also noted that with using of higher voltage (here 650 VDC) of PEO treatments, the higher Ca/P, Cu/P and Mg/P ratios were found than those after treatments at 500 VDC.
Źródło:
World Scientific News; 2017, 70, 2; 71-85
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solubility of pyrimidine derivatives in different organic solvents at different temperatures
Autorzy:
Baluja, Shipra
Powiązania:
https://bibliotekanauki.pl/articles/1190176.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
pyrimidine derivatives
Apelblat equation
Buchowski-Ksiazack λh equation
Gibb׳s energy
Opis:
The objective of this study was to measure and correlate the solubility of pyrimidine derivatives in five different solvents namely chloroform, N,N-dimethylformamide, tetrahydrofuran, 1,4-dioxane and ethyl acetate from 298.15 to 328.15 K under atmospheric pressure of 0.1 MPa using gravimetric method. The characterization of all the synthesized compounds was done by IR, NMR and mass spectra. The modified Apelblat and Buchowski-Ksiazczak λh equations were used to correlate the experimental solubility data. Using Van’t Hoff and Gibb’s equations, some thermodynamic parameters such as Gibb’s free energy, enthalpy and entropy of dissolution were evaluated from solubility data. It is found that solubility increases with temperature.
Źródło:
World Scientific News; 2016, 44; 13-34
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterisation of porous, calcium enriched coatings formed on Titanium via Plasma Electrolytic Oxidation
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Powiązania:
https://bibliotekanauki.pl/articles/1179160.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
85% orthophosphoric acid H3PO4
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate tetrahydrate Ca(NO3)2∙4H2O
Opis:
The SEM and EDS study results of porous and calcium enriched coatings obtained via Plasma Electrolytic Oxidation (Micro Arc Oxidation) on the Commercial Purity Titanium Grade 2 samples, at three potentials 450 VDC, 550 VDC, 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O in 1000 mL H3PO4, are presented in the paper. In the same electrolyte three Titanium samples, one after other, were treated, with the PEO processing time equaling 3 minutes after each immersion. Based on SEM and EDS results, it was possible to state that all obtained coatings are porous and their calcium-to-phosphorus (Ca/P) ratio decreases with decreasing PEO voltage. In addition, it was found out that electrolyte aging results in decreasing Ca/P ratio, too.
Źródło:
World Scientific News; 2017, 83; 29-44
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Solvent-free synthesis, antimicrobial and insect antifeedant potentials of some 4(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines
Autorzy:
Thirunarayanan, G.
Powiązania:
https://bibliotekanauki.pl/articles/1075725.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
3-oxazine-2-amines
4-(4-chloro-1-naphthyl)-5
6-dihydro-6-(substituted phenyl)-4H-1
SiO2-H3PO4
antimicrobial potentials
insect antifeedant activity
solvent-free synthesis
Opis:
More than 85% yields of thirteen 4-(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines weer synthesised by SiO2-H3PO4 catalyzed solvent-free cyclization of substituted styryl4-chloro-1-naphthyl ketones and urea under microwave irradiation. The synthesized oxazine amines have been characterized by analytical and spectroscopic techniques. The antimicrobial activities of these 4-(4-chloro-1-naphthyl)-5,6-dihydro-6-(substituted phenyl)-4H-1,3-oxazine-2-amines have been appraised by means of Bauer-Kirby technique. The insect antifeedant activities of these oxazine-2-amines were assessed by Dethler’s technique using 4th instar larvae Achoea janata L.
Źródło:
World Scientific News; 2019, 118; 1-16
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
SEM and EDS studies of porous coatings enriched in calcium and zinc obtained by PEO with ramp voltage
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Powiązania:
https://bibliotekanauki.pl/articles/1178366.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate Ca(NO3)2∙4H2O
linear polarization
ramp voltage
zinc nitrate Zn(NO3)2∙6H2O
Opis:
In this work, the SEM and EDS results of porous and enriched in calcium or zinc coatings, which were obtained during 3-minute treatments using Plasma Electrolytic Oxidation (Micro Arc Oxidation) processes on CP Titanium Grade 2 at ramp potentials (linear polarization) from 0 up to 650 VDC in electrolytes containing 500 g Ca(NO3)2∙4H2O and/or 500 g Zn(NO3)2∙6H2O in 1 L H3PO4, are presented. It was found that obtained coatings have pores with different shapes and diameters. The Ca/P and Zn/P ratios by atomic concentration are the same and equal to 0.2, what may suggest hydroxyapatite-like structure (M,Ti)x(PO4)y, where M = {Ca, Zn}.
Źródło:
World Scientific News; 2017, 77, 2; 242-255
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Development and SEM/EDS characterisation of porous coatings enriched in magnesium and copper obtained on titanium by PEO with ramp voltage
Autorzy:
Rokosz, Krzysztof
Hryniewicz, Tadeusz
Pietrzak, Kornel
Dudek, Łukasz
Powiązania:
https://bibliotekanauki.pl/articles/1179226.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
CP Titanium Grade 2
Micro Arc Oxidation (MAO)
Plasma Electrolytic Oxidation (PEO)
calcium nitrate Mg(NO3)2∙6H2O
linear polarization
ramp voltage
zinc nitrate Ca(NO3)2∙3H2O
Opis:
In the present paper, the SEM and EDS results of porous and enriched in calcium and/or zinc coatings, which were obtained during 3-minute treatments by Plasma Electrolytic Oxidation/ Micro Arc Oxidation processes on CP Titanium Grade 2 at ramp potentials (liner polarization) from 0 up to 650 VDC in electrolytes containing 500 g Mg(NO3)2∙6H2O and/or 500 g Cu(NO3)2∙3H2O in 1 L H3PO4, are reported. It was found that the obtained coatings, dependent on the PEO process conditions, have pores with different shapes and diameters. The Mg/P and Cu/P ratios by atomic concentration are the same and equal to 0.09±0.01 (by wt %) | 0.11±0.01 (by at%) and/or 0.40±0.08 (by wt %) | 0.19±0.04 (by at%), respectively. That may testify the hydroxyapatite-like structures of Mg-Ti-PO43– and/or Cu-Ti-PO43– have been identified to occur.
Źródło:
World Scientific News; 2017, 80; 29-42
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis and characterization of novel 2-oxo-4-((4-(3-oxomorpholino)phenyl)amino)-2H-chromene-3-carbaldehyde derivatives
Autorzy:
Jilariya, Krushnakumar J.
Sanghani, Yogesh J.
Patel, P. K.
Babariya, Jayesh
Powiązania:
https://bibliotekanauki.pl/articles/1068631.pdf
Data publikacji:
2019
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
4-(4-aminophenyl)morpholin-3-one
4-chloro-2-oxo-2H-chromene-3-carbaldehyde
antimicrobial activity
Opis:
A highly functionalized heterocyclic library were synthesized, characterized and tested for biological evaluation against bacteria and fungus. This novel synthetic rout involves nucleophilic substitution reaction of 4-chloro-2-oxo-2H-chromene-3-carbaldehyde with 4-(4-aminophenyl) morpholin-3-one in the presence of base and methanol as a solvent in good yield and high purity. All the synthesized compound of libraries characterized using 1H NMR, Mass, and IR spectroscopic technique. Also all compound screened for antimicrobial activity against standard drugs.
Źródło:
World Scientific News; 2019, 132; 264-269
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
An efficient protocol for the synthesis of novel 2-amino-N-(1-(aryl-2-oxo-2Hchromen-3-yl)ethylidene) benzohydrazides act as an antimicrobial agents
Autorzy:
Rola, R. R.
Joshi, H. D.
Powiązania:
https://bibliotekanauki.pl/articles/1031432.pdf
Data publikacji:
2021
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
2-amino-N'-(1-(6-bromo-2-oxo-2H-chromen-3-yl)ethylidene)benzohydrazides
antimicrobial evaluation
efficient procedure
Opis:
We report here the protocol for the preparation of 2-amino-N'-(1-(aryl-2-oxo-2H-chromen-3-yl)ethylidene)benzohydrazides compounds in moderate to excellent yields (46–86%) within a short reaction time (10–15 min), through a clean and efficient procedure. Additionally, the method has a wide substrate scope and provides an accessible route for the large-scale direct synthesis of 2-amino-N'-(1-(aryl-2-oxo-2H-chromen-3-yl)ethylidene)benzohydrazides. The products were assayed for their in vitro biological assay antimicrobial evaluation against two Gram-negative bacteria Escherichia coli MTCC 442, Pseudomonas aeruginosa MTCC 441 and antifungal activity against Candida albicans MTCC 227, Aspergillus Niger MTCC 282, Aspergillus clavatus MTCC 1323 at different concentrations which compared with ampicillin, chloramphenicol, ciprofloxacin, norfloxacin, nystatin, and greseofulvin in as standard drugs which are presented.
Źródło:
World Scientific News; 2021, 152; 15-26
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 21

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