Showing papers by "Hong Kong Baptist University published in 1992"
TL;DR: In this article, the interrelationship between the Hang Sang index futures contracts traded in Hong Kong and the underlying Hang-Sang index is investigated using the full-information estimation technique, Granger's definition of causality, and Hsiao's operational test.
Abstract: The interrelationship between the Hang Sang index futures contracts traded in Hong Kong and the underlying Hang Sang index is investigated. Causal relationships between the variables are studied using the full-information estimation technique, Granger's definition of causality (Granger, C. W. J. (1969) Econometrica, 37, 424–38) and Hsiao's operational test (Hsiao, C. (1981) Journal of Monetary Economics, 7, 85–106). The results indicate that futures prices cause cash index prices to change in the pre-crash period but not vice versa. In the post-crash period, it is found that a bi-directional causality exists between the two variables.1
37 citations
Journal Article•
TL;DR: In this paper, the effectiveness of Chlorella cells in concentrating Cu and Ni in their cells and thereby removing the two metals from solution was evaluated by free and immobilized algal cells.
19 citations
Journal Article•
TL;DR: The purified protein was confirmed to be Mirabilis antiviral protein (MAP), but in addition to its antiviral property, the MAP was demonstrated to possess abortifacient activity in pregnant mice, inhibitory effect on cell-free protein synthesis and antiproliferative effect on tumor cells.
Abstract: A protein was purified from root tubers of Mirabilis jalapa to homogeneity by ion-exchange chromatography on CM-Sepharose CL-6B and FPLC on Mono-S column The purified protein was confirmed to be Mirabilis antiviral protein (MAP) However, in addition to its antiviral property, the MAP was demonstrated to possess abortifacient activity in pregnant mice, inhibitory effect on cell-free protein synthesis and antiproliferative effect on tumor cells As judged from its biological and physiochemical properties, MAP is a type I ribosome-inactivating protein
17 citations
TL;DR: Iminodiacetic acid-cellulose sorbent, a chelating sorbent based on sawdust, was synthesized in a two-step reaction sequence as discussed by the authors, and the pH dependence of me metal ion extraction for Cr(III), Cu(II), Pb(II) and Ni(II).
Abstract: Iminodiacetic acid-cellulose sorbent, a chelating sorbent based on sawdust, was synthesized in a two steps reaction sequence. The pH dependence of me metal ion extraction for Cr(III), Cu(II), Pb(II) and Ni(II) was studied. The sorptive capacity and kinetic characteristic of the sorbent were found to be excellent in metal ion removal. The application of the sorbent for recycling and preconcentration of metal ions were investigated.
17 citations
TL;DR: Pyrroles have been efficiently synthesized by a three-step reaction sequence as mentioned in this paper, which consists of the addition of keto esters onto phenyl vinyl sulfoxide followed by Pummerer rearrangement.
Abstract: Pyrroles have been efficiently synthesised by a three-step reaction sequence. Michael addition of keto esters onto phenyl vinyl sulfoxide followed by Pummerer rearrangement gave the cyclic key intermediate 3. Mercury(II) salt induced carbon–sulfur bond cleavage afforded a 1,4-dicarbonyl equivalent 5. Treatment of the latter with an ammonium salt or a primary amine led to substituted pyrroles.
10 citations
TL;DR: In this paper, four isoquinolone alkaloids, N-methylcorydaldine, 8a oxyhydrastinine 8b, 6,7-dimethoxy-2-methylisocarbostyril 9a and doryanine 9b, have been efficiently synthesized from phenyl vinyl sulfoxide via the Pummerer type rearrangement as a key step.
Abstract: Four isoquinolone alkaloids, N-methylcorydaldine, 8a oxyhydrastinine 8b, 6,7-dimethoxy-2-methylisocarbostyril 9a and doryanine 9b, have been efficiently synthesized from phenyl vinyl sulfoxide via the Pummerer type rearrangement as a key step.
9 citations
TL;DR: In this article, primary and secondary amines, after in situ derivatization to their corresponding dithiocarbamates salts by a two-phase reaction, were determined in aqueous solution using differential-pulse polarography.
Abstract: Primary and secondary amines, after in situ derivatization to their corresponding dithiocarbamates salts by a two-phase reaction, were determined in aqueous solution using differential-pulse polarography. A single differential-pulse polarographic peak was obtained for dithiocarbamate derived from a secondary amine, whereas dithiocarbamate generated from a primary amine exhibited two peaks in its polarogram. The calibration graphs obtained from all polarographic peaks of the six amines under study were rectilinear over the range 5 × 10–6–2.5 × 10–5 mol dm–3 in the sample solution. For the micro-determination of amines, the method was found to be precise and the detection limit was 10 µg of amine.
3 citations