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Can be pollen used as a biological indicator of environmental pollution. So this work aims to determine some of the heavy metals such as Pb, Cr, Cd, Zn, and Cu in bee pollen from different areas in the Pelagonija region. The concentration of heavy metals in pollen depends on the geographical area, plants, and soil. And also, the composition of pollen varies with the source location, source plant, etc. The concentrations of transition metals copper (Cu), zinc (Zn), cadmium (Cd), and chromium (Cr) Lead (Pb) were measured by Gas Chromatography. The samples were collected from four different places, as well as a general picture of the phenomenology of the targeted sites, and accordingly obtained the ecological picture of the possible contamination. Also, the data of the composition of the soil were collected from the same locations, and are taken into consideration. Pollen collected by bees (Apis mellifera Мacedonica sub-species) is used as a bioindicator for further eco monitoring. The concentration of heavy metals contents in pollen is varies from sample to sample, due to the difference in the geographical area, various plants species, and soil. The composition of pollen varies with the source location, source plant, and handling. We have collected samples during the same season from the bee apiaries, located in industrial-urban and rural areas. The availability of heavy metals in plants depends on soil reaction, mineral colloids, soil humidity, microbiological activity, and organic matter content. Hence pollen can be used as a biological indicator of environmental pollution.

The present work based on soil nutrients analysis of covered and uncovered fields nursed with organic fertilizer and cultivated with various crops. Collected the soil from three deep bottoms (5 cm, 15 cm, and 30 cm), mixed, and prepared five different samples. Calculated the pH value, electrical conductivity, and the percentage of nitrogen, phosphorus, Potassium, the humus of the collected soil samples and documented all the parameters. The results showed that the soil has moderately high pH values (7.9 in the greenhouse and 7.5 in the uncovered area), the E.C of greenhouse (4.1dS/m) is slightly lower than the uncovered area (4.8dS/m), nitrogen (6.3% than in the uncovered field 4.7%), relatively high concentration of phosphorus (5.16 mg/100g in the greenhouse uncovered field 4.67 mg/g), relatively high potassium values (39.04mg/100g in the greenhouse and 36.30 mg/g in the uncovered area) and high values of humus (12.7 % in the greenhouse and 9.1 % in the uncovered area). Concluded that the soil is saturated in the greenhouse with phosphorus and Potassium, no need to further fertilizations in the forthcoming years, and thegreenhouse is better for crop cultivation.

The present work is focussed to determine the Macedonian white brined cheese’s free amino acid profile. Four variants of the Macedonian white brined cheese to analyze and determine free amino acid concentration; cheese samples define the Macedonian white brined cheese as a typical cheese. All free amino acids were specified, except the amino acid tyrosine. The detected amino acids in the tested cheese variants were present in different but approximate parameter values. The estimated essential free amino acids, the concentration of lysine was found highest in all examined samples with values from 26.40 ± 0.02 mg% to 28.20 ± 0.04 mg% and the concentration of threonine was the lowest from 3.19 ± 0.02 mg% to 3.32 ± 0.02 mg%). In the detected unessential free amino acids, the concentration of aspartic amino acid was highest in all the samples with values from 11.02 ± 0.05 mg% to 11.32 ± 0.03 mg% and the concentration of proline was at the lowest level from 4.16 ± 0.06 mg% to 4.22 ± 0.04 mg%.

A modest attempt has been made for the synthesis of hydrazoneoxime ligands bearing pyrazolone group (1-4) and their successive metal complexes such as: 1(a-c), 2(a-c), 3(a-c) and 4(a-c). The precursor (1Z,2E)-2-(hydroxyimino) ethanehydroximohydrazide (GH2) was obtained through coupling of (1Z,2E)-N-hydroxy-2-(hydroxyimino) ethanimidoyl chloride and hydrazinium hydroxideto generate hydrazonoxime compounds bearing the pyrazolone group. The ligands (1-4) were reacted with MX2.nH2O, where M = Co(II), Ni(II) and Cu(II) to obtain the successive metal coordinated compounds into good yields. The ligands and their metal complexes were investigated by using 1H NMR, 13C NMR, FT-IR, elemental analysis and magnetic susceptibility measurements.Tautomerism in the ligands is investigated spectroscopically and biological activities are evaluated as well. Finally, the findings of present study were found within good egreement with other workers.

The co-precipitation and in situ modified Hummers’ method was used to synthesize Nickel Spinal Ferrites (NiFe) nanoparticles and NiFe coated with Thermally Reduced Graphene Oxide (TRGO) (NiFe-TRGO) nanoparticles, respectively. By using polyvinyl chloride (PVC), tetrahydrofuran (THF), and NiFe-TRGO, the nanocomposite film was synthesized using the solution casting technique with a thickness of 0.12–0.13 mm. Improved electromagnetic interference shielding efficiency was obtained in the 0.1–20 GHz frequency range. The initial assessment was done through XRD for the confirmation of the successful fabrication of nanoparticles and DC conductivity. The microstructure was analyzed with scanning electron microscopy. The EMI shielding was observed by incorporating a filler amount varying from 5 wt.% to 40 wt.% in three different frequency regions: microwave region (0.1 to 20 GHz), near-infrared (NIR) (700–2500 nm), and ultraviolet (UV) (200–400 nm). A maximum attenuation of 65 dB was observed with a 40% concentration of NiFe-TRGO in nanocomposite film.

A batch equilibrium system was utilized to examine methylene blue (MB) adsorption on prepared NiO and CuO nanoparticles (NPs). Different factors affecting the adsorption performance of NiO and CuO ...

Two of dihydropyridine derivatives, namely, 4,6-dimethyl-2-oxo-1,2-dihydropyridine-3-carbonitrile (DPCN) and 4,6-dimethyl-2-oxo-1,2-dihydropyridine-3-carboxamide (DPCA) were evaluated as controller...