Wyniki wyszukiwania - Biblioteka Nauki

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Effect of modified polyacrylamide on plant-availability of Cd and Pb to Corn in polluted soils

100%

Shirani H. , Hosseini H. , Hamidpour M. , Shamshiri M. H.

Polish Journal of Environmental Studies

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2016

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tom 25

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nr 6

EN

We studied the effects of modified polyacrylamide (MPAM) on plant-uptake of Cd and Pb in two agricultural soils of different textures that had been contaminated simultaneously with Cd and Pb. In a pot experiment under greenhouse conditions different doses of modified polyacrylamide (0, 0.1, 0.2, and 0.3%) were added to artificially polluted soils (sandy and sandy loam). Results indicated that soil pH gradually increased with the application of modified polyacrylamide in both soils. Soil EC significantly increased due to the addition of modified polyacrylamide in the sandy loam soil as compared to the control. The concentrations of Cd and Pb in plants grown in sandy loam soils were less than those planted in sandy soils. The addition of modified polyacrylamide to both soils significantly decreased Pb concentrations in corn roots and shoots. On the contrary, uptake of Cd by shoots was increased in pots containing 0.1% MPAM in both soils compared to those in the unamended soils. While Cd uptake by shoots was not affected by MPAM in soils as compared to those in the unamended soils. The transfer factor (TF) values of Pb were much less than those of Cd in the same treatments.

2

Elastic analysis of polymeric cylinders reinforced with carbon nanotubes

100%

Hosseini H. , Kolahchi R. , Heydari M.

Journal of Applied Mathematics and Computational Mechanics

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2016

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tom Vol. 15, nr 2

31--39

EN

In this work, stress analysis of a polymeric cylinder’s cylindrical shell reinforced with carbon nanotubes (CNTs) is investigated. The cylinder is subjected to mechanical and thermal loadings. All the equivalent mechanical and thermal properties of nano-composite cylinder are obtained using Mori-Tanaka model. Based on equilibrium, the governing equation is derived. Using an exact solution, the stresses and radial displacement distributions in the structure are calculated. The effects of CNTs volume percent on the stresses and radial displacement for internal and external pressure cylinder are the main discussion of this study. Numerical results indicate that with increasing CNTs volume percent, the stresses decrease. However, this shows the important effect of nanotechnology in stress reduction of cylinder which may be useful in sensors and actuators.

3

Antimicrobial and antioxidant activity of Epimedium pinnatum

100%

Mahboubi M. , Kazempour N. , Hosseini H. , Mahboubi M.

Herba Polonica

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2013

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tom 59

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nr 2

EN

Epimedium pinnatum (Berberidaceae family) is used as an aphrodisiac in traditional Chinese medicine (TCM). The aim of this study was to evaluate the antimicrobial and antioxidant activity of E. pinnatum extracts (ethanol, methanol and aqueous extracts). Total phenolic (TPC) and flavonoid contents (TFC) of each extract were assessed by spectrophotometric methods. It was exhibited that methanol extract had better antimicrobial activity than those of ethanolic extract or aqueous extract. The TPC and TFC of E. pinnatum extracts was higher in methanol extract (149 and 36.6 mg/g) than that of ethanolic extract (137.2 and 19.5 mg/g) and aqueous extract (86.2 and 8.4 mg/g). The methanol extract had lower IC50 value (200 µg/ml) than ethanolic (250 µg/ml) and aqueous extract (400 µg/ml). There was a positive correlation between TPC, TFC in E. pinnatum extract and their antioxidant and antimicrobial activity.

PL

W tradycyjnej medycynie chińskiej Epimedium pinnatum (rodzina Berberidaceae) używa się jako afrodyzjaku. Celem niniejszej pracy była ocena działania przeciwbakteryjnego i przeciwutleniającego wyciągów: etanolowego, metanolowego i wodnego z Epimedium pinnatum. Całkowita zawartość fenoli i całkowita zawartość flawonoidów w każdym z wyciągów została oznaczona metodami spektrofotometrycznymi. Wykazano, że wyciąg metanolowy miał lepsze działanie przeciwbakteryjne niż wyciąg etanolowy i wodny. Całkowita zawartość fenoli i całkowita zawartość flawonoidów była wyższa w wyciągu metanolowym (149 i 36,6 mg/g) niż etanolowym (137,2 i 19,5 mg/g) i wodnym (86,2 i 8,4 mg/g). Wyciąg metanolowy miał niższą wartość IC50 (200 µg/ml) niż wyciąg etanolowy (250 µg/ml) i wodny (400 µg/ml). Zauważono pozytywną korelację między całkowitym stężeniem fenoli i całkowitym stężeniem flawonoidów w wyciągach z E. pinnatum, a ich działaniem przeciwutleniającym i przeciwbakteryjnym.

4

Human hydatidosis in Alborz Province: a 5-year retrospective epidemiological analysis of hospitalized cases (2014–2019)

75%

Omidinia N. , Zibaei M. , Hosseini H. , Pourrostami K. , Vafae Eslahi A. , Badri M.

Annals of Parasitology

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2020

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tom 66

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nr 4