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Articles by A.N. Boyce
Total Records ( 4 ) for A.N. Boyce
  O.P.S. Rebecca , R. Zuliana , K. Wijenthiran , A.N. Boyce and S. Chandran
  Dendrobium Sonia and Dendrobium Savin White are popular Dendrobium hybrids in the Orchidaceae Family which are ethylene-sensitive and exhibit earlier senescence due to pollination. Pollinated Dendrobium Sonia and Dendrobium Savin White showed shorter vase life and initiate earlier perianth senescence that demonstrates rapid sepal and petal wiltingand discolouration. Experiments were carried out to observe the changes in antioxidant activities and pigment fading throughout the flower`s vase life. As Dendrobium Sonia and Dendrobium Savin White senesces, there is discolouration, the flower appears dull and weak, which indicates pigment loss and this observation is correlated with the L* a*/b* colour readings carried out using the Chromameter CR-200. The total anthocyanin quantification using the pH-differential method showed that pollinated Dendrobium Sonia had lower concentration compared to unpollinated Dendrobium Sonia. The total polyphenol assay on pollinated and unpollinated flowers for both hybrids showed lower content in those pollinated compared to those unpollinated. The reducing power assay confirmed that there were antioxidant properties present in both hybrids and the reducing capability increases with the increase of dry weight sample.
  R. Zuliana , A.N. Boyce , H. Nair and S. Chandran
  Experiments were carried out to investigate the effects of different types and concentration of sugars and Aminooxyacetic acid (AOA) and a combination of both sugar and AOA in extending the vase lives of pollinated Dendrobium Pompadour flowers. Post pollination symptoms such as weight loss, water uptake, petal thickness and discoloration were monitored. The results obtained showed that the most effective treatments in extending the vase life of pollinated Dendrobium Pompadour flowers and delaying the post pollination symptoms were 0.05 mM AOA and the treatment which combined 0.05 mM AOA with 4% glucose. Both treatments showed a longer vase life than that of the control. Furthermore positive effects were also observed in a delay of weight loss, improved water uptake, change in thickness and colour. A combination of 0.05 mM AOA and 2% sucrose extended the vase life of flowers up to 5 days. Inclusion of 4% glucose and 2% sucrose alone only prolonged the vase life of flowers two days more compared to that of the control. Holding solutions containing sugars alone maintained pH values of 5-7 while solutions containing AOA and a combination of AOA and sugars showed more acidic values of pH of 3-5 throughout. AOA and a combination of AOA and glucose can therefore extend the vase life of pollinated Dendrobium Pompadour flowers and also delay the post pollination syndrome.
  J. Rosnah , M.M. Khandaker and A.N. Boyce
  Ficus deltoidea is a native plant of Malaysia which is very potential plant for varied purposes. It has diversed morphology and was spread throughout Malaysia and adjacent countries. Its great potential had been valued by the old folks and now it is getting famous as more attention given in exploring herbs as an alternative for medicine. Ficus deltoidea is an ultimate source of antioxidant and natural products. It is commercialized as tea and is proposed as a possible supplement for type II diabetes patients. Ficus deltoidea studied for its numerous pharmacological properties such as antioxidant and antidiabetic properties, anti-inflammation and antinociceptive activity, wound healing activity, antiulcerogenic effect, antibacterial, anticancer and also it’s potential as an uterotonic agent. This article review provide more thorough information about F. deltoidea plants in detail in term of plant, origin, morphology, ecology, variety, commercial usage and its pharmacological benefits.
  O.P.S. Rebecca , R. Zuliana , A.N. Boyce and S. Chandran
  Pigment extracted from the pulp of Hylocereus polyrhizus showed a difference in colour when subjected to room temperature extraction and 100 °C extraction. The room temperature extraction yielded red-purple coloured pigments while the 100 °C extraction yielded scarlet red coloured pigments. Experiments were carried out to investigate the best water:weight ratio and optimum temperature to obtain highest pigment concentration, best extraction method and best storing condition. Best water:weight ratio was 1:1, best temperature observed was 100 °C, best extraction method was by using juice concentrate rather than water extraction and the best storing condition was storage in -20 °C. Both extraction methods exhibited stable pH reading after one week of storage. Nevertheless, the best method to obtain high pigment concentration is by using juice concentrate which is at least two times more concentrated than samples extracted with water.
 
 
 
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