Ramya Prasanthi Mokkapati, Jayasravanthi Mokkapati and Venkata Nadh Ratnakaram
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Agnieszka Wróblewska, Katarzyna Janda, Edyta Makuch, Marika Walasek, Piotr Miądlicki and Karolina Jakubczyk
their use. Guide to selected species. Rzeszów, Polska: Procapathia.
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Valentina V. Pidlisnyuk, Larry E. Erickson, Josef Trögl, Pavlo Y. Shapoval, Jan Popelka, Lawrence C. Davis, Tetyana R. Stefanovska and Ganga M. Hettiarachchi
Peculiarities of metals uptake by the biofuel crop Miscanthus x giganteus were explored during plant growth at soil from the military site (Sliač, Slovakia). The experiment was carried out in greenhouse during two vegetation seasons. Research soil was predominantly elevated in Fe and Ti, while other metals (As, Cu, Mn, Sr, Zn and Zr) were presented at order of magnitude lower concentrations. No inhibition of plant growth was observed. The calculated Bioconcentration Factor showed that levels of metals’ accumulation by plant roots, stems and leaves were independent of metals’ concentrations in the soil. The accumulation of metals by stems and leaves was much lower than by roots. As, Zr, Ti were almost not accumulated by stems and leaves during both seasons; accumulation of Cu, Fe, Mn, Zn and Sr was not essential which confirmed that biomass of M. x giganteus might be processed for the energy purpose.
The study summarises the basic information on daguerreotype, the first ever practically used photographic process, which was used mainly in the period 1840 - 1860. Daguerrotype takes advantage of a photosensitive layer of silver halides on a silver layer to capture an image, it uses a reaction of silver with mercury vapours to develop the image. The production process via daguerreotype as described hasn’t changed since its deployment and stabilisation in the middle of 19th century. The properties of a daguerreotype image are given by its soft microstructure, which could have only been described after introduction of the electron microscopy. The susceptibility of daguerrotypes to damage and degradations stems not only from their low mechanical resistance but also from unsuitable conservation interventions and archiving conditions.
Hajira Haroon, Syed Mubashar Hussain Gardazi, Tayyab Ashfaq Butt, Arshid Pervez, Qaisar Mahmood and Muhammad Bilal
Cr(VI) adsorption was studied for abundantly available low-cost lignocellulosic adsorbents in Pakistan namely, tobacco stalks (TS), white cedar stem (WCS) and eucalyptus bark (EB). Several process variables like contact time, adsorbent dose, pH, metal concentration, particle size and temperature were optimized in batch mode. EB showed high Cr(VI) adsorption of 63.66% followed by WCS 62% and TS 57% at pH 2, which is higher than most of the reported literature. Langmuir isotherm (R2 = 0.999) was well fitted into the equilibrium Cr(VI) data of EB, suggesting homogeneous active sites and monolayer coverage of Cr(VI) onto the EB surface. Freundlich (R2 = 0.9982) isotherm was better fitted to the equilibrium data of TS and WCS, revealing the adsorption sites with heterogeneous energy distribution and multilayer Cr(VI) adsorption. Moreover, the Cr(VI) adsorption of studied adsorbents followed the pseudo-second order kinetic model. Thermodynamic properties were investigated in two temperature ranges, i.e., T1 (303–313 K) and T2 (313–323 K). TS and EB showed the exothermic at T1 and endothermic reactions at T2 with entropy controlled adsorption at the solid-liquid interface, and WCS exhibited an opposite thermal trend with decreasing disorderness at solid-liquid interface as temperature rises. Gibbs free energy (ΔG>0) confirmed the non-spontaneous adsorption process for all studied adsorbents.
K. Szmuc, M. Kus-Liskiewicz, Ł. Szyller, D. Szmuc, M. Stompor, I. Zawlik, T. Ruman, S. Wołowiec and J. Cebulski
The composite containing nanosilver uniformly deposited on matrix composed of CaHPO4 x 2H2O (brushite, ca 89 mass %), CaHPO4 (monteonite, ca 9.5 mass%), and Ag3PO4 (0.5 mas%) was obtained by addition of calcium nitrate and silver nitrate aqueous solution at 30:1 Ca:Ag molar ratio into excess of (NH4)2PO4 solution at pH 5.0 – 5.5. The isolated solid was characterized by STEM, XRD, and LDI mass spectrometry. It has been found that nanosilver was uniformly distributed within composite as <10 nm diameter sized nanoparticles. Determination of silver by AAS showed that 60% of silver is present as Ag(0) nanoparticles, the present as matrix Ag3PO4 as identified by XRD method. The composite showed strong growth inhibition in E. coli and P. aeruginosa strains, and moderate towards S. aureus. The C. albicans cells were the most resistant to the tested material, although still composite was moderately cytostatic for the yeast.
Li Cong, Zhang Li, Zhang Guanqun, Xu Jianguo and Zhang Long
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Krzysztof Górnicki, Agnieszka Kaleta, Andrzej Bryś and Radosław Winiczenko
drying time and product quality. Bioresources 8(1), 855–863. DOI: 10.15376/biores.8.1.855-863.
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