17 research outputs found
A New Quartic Equation of State Based on a General Form and Its Application to Pure Fluids
No full textA new quartic equation of state (EOS) based on a general form is proposed. Parameters in the new equation are regressed as substance-specific constants for 88 pure substances. The calculated saturated properties for nonpolar and polar substances are compared with experimental data and with that obtained by the Peng–Robinson Stryjek–Vera (PRSV), Patel–Teja (PT), and Yun EOSs for the various pure substances. Despite its simplicity, the proposed equation has good predictive capability over the entire temperature region
Chemical composition and biological activities of the essential oil from <i>Rubus pungens</i> var. <i>oldhamii</i>
No full text<p>This paper presents a study on chemical composition, antimicrobial, antioxidant and tyrosinase inhibitory properties of the essential oil from leaves of <i>Rubus pungens</i> var. <i>oldhamii</i> (REO). The major component of the REO is sesquiterpenes (36.04%), which consists of 1,5-Cyclooctadiene,3-(1-me thylallyl)-(8CI)(17.66%), 5,6-Diethenyl-1-methylcyclohexene (12%), (+) – γ-Elemene (10.48%) and β-Caryophyllene (8.39%).The REO is shown to be moderately active against <i>Staphylococcus</i> <i>aureus,</i> <i>Aspergillus</i> <i>niger</i> and <i>Penicillium</i> <i>glaucum</i>, and has weak antioxidant activity in 1,1-diphenyl-2-picrylhydrazyl (DPPH) assay. Furthermore, tyrosinase inhibition was investigated against monophenolase (L-tyrosine). IC<sub>50</sub> values of REO and arbutin were found 0.923 and 0.657 mg/mL, respectively. The REO exerted potential antityrosinase activity. Our test results indicated that the REO was rich in sesquiterpenes, and also exhibited good antityrosinase activity, and moderate antimicrobial activity against pathogenic micro-organisms. The REO can be used as a natural source of promising antimicrobial and tyrosinase inhibiting agent.</p
XRD patterns of the synthesized LDHs.
No full text<p>A: S-Ni<sub>0.1</sub>MgAl, B: S-Ni<sub>0.1</sub>MgAl-Nd, C: S-Ni<sub>0.1</sub>MgAl-Ce and D: S-Ni<sub>0.1</sub>MgAl-La.</p
IR spectra of the synthesized LDHs.
No full text<p>A: S-Ni<sub>0.1</sub>MgAl, B: S-Ni<sub>0.1</sub>MgAl-Nd, C: S-Ni<sub>0.1</sub>MgAl-Ce and D: S-Ni<sub>0.1</sub>MgAl-La.</p
Contact angle images of the synthesized LDHs.
No full text<p>A: S-Ni<sub>0.1</sub>MgAl, B: S-Ni<sub>0.1</sub>MgAl-Nd, C: S-Ni<sub>0.1</sub>MgAl-Ce and D: S-Ni<sub>0.1</sub>MgAl-La.</p
TEM images of the synthesized LDHs.
No full text<p>A: S-Ni<sub>0.1</sub>MgAl, B: S-Ni<sub>0.1</sub>MgAl-Nd, C: S-Ni<sub>0.1</sub>MgAl-Ce and D: S-Ni<sub>0.1</sub>MgAl-La.</p
TGA curves of S-Ni<sub>0.1</sub>MgAl, S-Ni<sub>0.1</sub>MgAl-La, S-Ni<sub>0.1</sub>MgAl-Ce and S-Ni<sub>0.1</sub>MgAl-Nd.
No full text<p>TGA curves of S-Ni<sub>0.1</sub>MgAl, S-Ni<sub>0.1</sub>MgAl-La, S-Ni<sub>0.1</sub>MgAl-Ce and S-Ni<sub>0.1</sub>MgAl-Nd.</p
XRD patterns for the pristine EVA and LDHs/EVA composites with a loading of 20 wt% LDHs.
No full text<p>A: the pristine EVA, B: S-Ni<sub>0.1</sub>MgAl/EVA, C: S-Ni<sub>0.1</sub>MgAl-Nd/EVA, D: S-Ni<sub>0.1</sub>MgAl-Ce/EVA and E: S-Ni<sub>0.1</sub>MgAl-La/EVA.</p
Tensile strength and the elongation at break of composites with different contents of LDHs.
No full text<p>A: Tensile strength curves and B: Elongation at break curves.</p
TEM images for LDHs/EVA composites with a loading of 20 wt% LDHs.
No full text<p>A: S-Ni<sub>0.1</sub>MgAl/EVA, B: S-Ni<sub>0.1</sub>MgAl-Nd/EVA, C: S-Ni<sub>0.1</sub>MgAl-Ce/EVA and D: S-Ni<sub>0.1</sub>MgAl-La/EVA</p
