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Abstract:© Versita Sp. z o.o.

A pot experiment was conducted to investigate the effects of cadmium and zinc interactions on the accumulation and tissue distribution of cadmium and zinc in tomato (Lycopersicon esculentum Mill.). The results obtained in this study reveal that treatment of soil with Cd, Zn, or Cd-Zn did not improve plant growth as compared to control. The levels of concentrations of Cd and Zn in leaves, shoots and roots were determined. The highest concentration of Cd was 135.0 mg kg 71 d.w. in the leaves, 57.0 mg kg 71 d.w. in the shoots, and 210.0 mg kg 71 d.w. in the roots; Zn concentration ranged from 186.0-776.0 mg kg 71 d.w. in leaves, 126.7-700.0 mg kg 71 d.w. in shoots, and 320.0-2015.0 mg kg 71 d.w. in roots of tomato plant. Significant inhibitory effects of Zn on Cd accumulation in all organs of tomato plant occurred only at toxic levels (100 and 1000 mg kg 71 soil), but the reduction in Cd concentration did not improve shoot and root biomass suggesting that Zn concentration became the dominant factor affecting plant growth. An examination of Cd-Zn interactions and their transfer to soil-plant system indicate their synergistic effect. Increasing Cd and Zn concentrations in soil result in an increase in the accumulation of Cd or Zn in the plant tissues.

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Polyacrylonitrile co-polymer microfibers of diameter 12.5 μm was used for electrospinning to produce nanofibers and then used as a stationary phase in UTLC for on-plate identification and separation of amino acid from drug sample.

The synthesis and spectroscopic characterization of azido derivatives of Cu(II) complexes with macrocyclic building blocks of the type [CuLN 3 ] n Á [ClO 4 Á 3/2H 2 O] n (1), [CuL(N 3 ) 2 ] (2) and [CuL 1 N 3 ] n Á [ClO 4 ] n (3) (where L ¼ 3,10-bisbenzyl-1,3,5,8,10,12-hexaazacyclotetradecane and L 1 ¼ 3,10-bisbenzyl-6,13-dimethyl-1,3,5,8,10,12-hexaazacyclotetradecane) are reported. On the basis of single-crystal X-ray diffraction, 1 and 3 have a 1-D polymeric chain where Cu(II) ions are bridged by single azide in the -1,3 (end-to-end) bridging mode in a trans-position with respect to the azide. When [CuLN 3 ] n Á [ClO 4 Á 3/2H 2 O] n was recrystallized from acetone, the nonpolymeric 2 was obtained, where Cu(II) is in a tetragonally distorted octahedral environment. The chains of [CuLN 3 ] n Á [ClO 4 Á 3/2H 2 O] n and [CuL 1 N 3 ] n Á [ClO 4 ] n propagate parallel to the crystallographic b-axis and are stacked one over the other along the c-axis by hydrogen bonding. The azides exhibit symmetric coordination. The ClO À 4 ions fill channels formed between the strings of octahedra and are held in place by hydrogen bonds leading to the formation of a 3-D network. Compound 1 exhibits only very weak antiferromagnetic interactions, while 2 and 3 show no signs of magnetic exchange.