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Repellent, toxic, and food protectant effects of pithraj,Aphanamixis polystachya extracts against pulse beetle,Callosobruchus chinensis in storage (1994)

Talukder, F. A. ; Howse, P. E.

Springer

Journal of chemical ecology 20 (1994), S. 899-908

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ISSN: 1573-1561

Keywords: Aphanamixis polystachya ; pithraj ; repellent ; contact toxicity ; food protectant ; Callosobruchus chinensis ; Coleoptera ; Bruchidae

Source: Springer Online Journal Archives 1860-2000

Topics: Biology , Chemistry and Pharmacology

Notes: Abstract Ground leaves, bark, seeds, and four seed extracts of pithraj,Aphanamixis polystachya (family Meliaceae), a locally grown plant in Bangladesh, were evaluated for their repellency, contact toxicity, and food protectant efficacy against adult pulse beetle (Callosobruchus chinensis L.). The seed extracts showed poor repellent effects, but high contact toxicity to adults at 72 hr after application. The ground leaves, bark, and seeds provided good protection for mung beans against pulse beetles, and the seed powder greatly reduced the F1 progeny and seed damage rates.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF02059586

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Synthesis and the preliminary analysis of block copolymers of 3,3′-bis(azidomethyl)-oxetane and 3-nitratomethyl-3′-methyloxetane (1990)

Talukder, Mostafa A. H. ; Lindsay, Geoffrey A.

Bognor Regis [u.a.] : Wiley-Blackwell

Journal of Polymer Science Part A: Polymer Chemistry 28 (1990), S. 2393-2401

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ISSN: 0887-624X

Keywords: Chemistry ; Polymer and Materials Science

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The preparation of poly[3,3′-bis(azidomethyl)oxetane-b-3-nitratomethyl-3′-methyloxetane-b-3,3′-bis(azidomethyl)oxetane], BAMO-NMMO-BAMO triblock copolymer, was attempted by using p-bis(α,α-dimethylchloromethyl)benzene (p-DCC) with silver hexafluoroantimonate (AgSbF6) to initiate the sequential polymerization of NMMO and BAMO. The analysis of the polymer by different techniques such as nuclear magnetic resonance (NMR), infrared (IR) spectroscopy, and differential scanning calorimetry (DSC) show that the structure of the polymer is composed of a two-phase domain structure of amorphous NMMO phases and crystalline BAMO phase. The molecular weight distribution of the polymer, determined by gel permeation chromatography-low angle laser light scattering (GPC-LALLS) was fairly narrow which indicates that the chains could be propagating by a quasi-living ionic mechanism. Thermogravimetric analysis (TGA) shows that the decomposition temperature of the polymer is about 204°C, which indicates good thermal stability of the polymer.

Additional Material: 10 Ill.