AbstracyThe essential oil of leaves of Eryngium foetidum from Bangladesh was analyzed by GC-MS. Sixty three compounds have been identified with (E)-2-dodecenal (37.4 %), dodecanoic acid (10.7 %), trans-2-dodecanoic acid (9.7 %), (E)-2-tridecenal, (6.7 %), duraldehyde (5.1 %) and tetradecanal (4.4 %) as the major constituents.

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Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

An efficient protocol was developed for in vitro plant regeneration of Jasminum grandiflorum L. The highest elongated shoots (60%) were achieved from axillary meristems using MS (Murashige and Skoog ) basal medium supplemented with 1 mg/l 6-benzyladenine (BAP) and 60 mg/l coconut water. After adding 1.0 mg/l BAP and 45 mg/l coconut water in the culture medium, the highest rate of shoot proliferation was exhibited after 4 weeks of culture. Rooting was found within 14-23 days after the cut end of shoots was soaked in 1.5 mg/l IBA solution for 3-7 minutes. The regenerated healthy rooted plantlets were transferred to small plastic pot containing garden soil and compost in a ratio of 2:1. Maximum (75%) in vitro rooted plants were survived in the shade house and finally survived naturally in soil condition. The successful protocol for in vitro regeneration was developed which will facilitate the conservation and propagation of the important medicinal plant.Bangladesh J. Sci. Ind. Res.53(4), 277-282, 2018

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