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21 record(s) found

Chemical Constituent from Alstonia Spathulata BL. (Apocynaceae)

Tee Chuan Thing, Ahmad Kartini, Awang Khalijah, Tan Siow Ping, Nafiah Mohd Azlan,

Abstract

In Malaysia, Alstonia spathulataBl. is locally known as pulai basong which distribute in peat forest. The separations of the chemical components from hexane crude extract (bark) of Alstonia spathulata were carried out using different chromatographic techniques (column chromatography and thin layer chromatography). One compound were isolated and identified as lupeol acetate (1). This compound have never been reported and isolated from this species. The structures of this compound were elucidated based on the basis of detailed 1D-NMR (1H, 13C and DEPT) and 2DNMR (COSY, HSQC, HMBC) spectroscopic analysis. The data analysis was also compared with the literature...

Conference Item Published 2012 6164 hits Available

Isolation of terpenoid from Alstonia Spathulata and Kopsia Singapurensis (Apocynaceae)

Tee, Chuan Thing

Abstract

The aim of this study was to extract and identify the chemical compounds isolated from Alstonia spathulata and Kopsia singapurensis. The isolated compounds were tested for their biological activities include cytotoxicity (MCF-7 cell line), antibacterial (Bacillus cereus) and antioxidant (DPPH). The separation of the chemical components from both species was carried out using different chromatographic techniques (column chromatography and thin layer chromatography). The structures of isolated compounds have been elucidated through spectral analysis including 1D-NMR (1H, 13C and DEPT), 2D-NMR (1H-1H COSY, HSQC/HMQC and HMBC), IR, UV, MS (GCMS) and also by comparison with previous literature data. Studies on the chemical constituents of the bark of Alstonia spathulata has led to the isolation of five triterpenes; β-amyrin 113, β-amyrin acetate 114, β-sitosterol 115, lupeol acetate 116, stigmasterol 117 and a mixture of three triterpenes (lupeol 118, α-amyrin 119 and β-amyrin 113). Fo.....

Thesis Published 2014 1121 hits Available

Phytochemical study of stem bark from Alstonia spathulata Bl. (Apocynaceae)

Tee Chuan Thing, Lee Yean Shan, Tan Siow Ping, Awang Khalijah, Nafiah Mohd Azlan, Ahmad Kartini,

Abstract

In Malaysia, Alstonia spathulata Bl. is locally known as ‘Pulai Basong’ which distribute in peat forest. The separation of the chemical components from hexane and DCM crude extract of Alstonia spathulata was carried out using column chromatography (CC) and thin layer chromatography (TCL) techniques. A total of five known compound were isolated from the stem bark extracts and identified as: β-amyrin, β-amyrin acetate, lupeol acetate, stigmasterol and β-sitosterol. The elucidation structures of these compounds were established using 1D-NMR (1H, 13C and DEPT) and 2D-NMR (COSY, HSQC, HMBC) spectroscopic analysis, involving also comparison with data from the literature...

Article Published 2014 4168 hits Available

The effect of perceived ease of use readiness and resource availability on the intention to adopt internet on the intention to adopt internet of thing for marketing among small medium enterprises in Selangor

Amalahmathi Subramaniam

Abstract

This research aimed to identify the effects of Perceived Ease of Use (PEOU), Readiness (RD), and Resource Availability (RA) on the intention to adopt the Internet of Things (IoT) for marketing among Small and Medium Enterprises (SMEs) in Selangor. Selangor was chosen due to its high concentration of SMEs, making it the state with the largest number of such enterprises in Malaysia. A quantitative survey was conducted, using a sample of 387 respondents consisting of Chief Executive Officers, Board Members, and Managers who serve as decision-makers within these SMEs. The sample was identified through simple random sampling, descriptive data analysis, correlation, and multiple linear regression were applied to assess the effects of the variables. The findings revealed positive relationships between IoT adoption and PEOU (r = 0.921, n = 387, p < .001), RD (r = 0.892, n = 387, p < .001), and RA (r = 0.686, n = 387, p < .001). The high R-Square value of .993 significant F statistic confirm th.....

Thesis Published 2024 167 hits Available

Pembinaan modul pengajaran dan pembelajaran kraf keris di sekolah menengah

Othman Abdul

Abstract

The purpose of this research is to build and prepare a teaching and learning module of Malay Keris handicraft that the educators can utilize in their teaching in the secondary schools. This research is focussed in producing a Malay Keris handicraft product whereby it had been thought theoritically only, before, during the teaching process. Therefore, from the results of this research the writer has developed a teaching and learning module of Keris handicraft based on the Curriculum Specifications fixed by the Ministry of Education and Curriculum Development Centre. The results of this research indicated that ‘keris’ is actually one of the traditional Malay handicrafts that its sovereignty should be preserved as a Malay symbol. Other than that, the writer wants to know whether this traditional Malay handicraft can be accepted in the teaching and learning process and whether it changes the students’ interpretation in learning a new thing. Besides looking at the development of Keris.....

Thesis Published 2006 5024 hits Available

Taking the chance: a descriptive study of a creative work that utilizes chance and indeterminacy whilst maintaining form

Burrel Robert W B,

Article Published 2013 1139 hits Available

A study of the reading comprehension strategies in think-aloud protocols by lower six students of SMK Raja Chulan, Ipoh

Ng, Min Hong

Abstract

The most important thing about reading is comprehension. Reading comprehension is the heart and soul of reading (Block, Gambrell & Pressley, 2003). Learning to read with good comprehension is a complex task. Comprehension is complicated and it requires strategies to construct meaning effectively. Because of its significance, this study is to investigate the strategies used by students to construct, to monitor and to evaluate what they are reading. Think-aloud protocol analysis is the method used in this study. The think-aloud protocol are the coded according to the procedure developed by Cote & Goldman (2004) which involved five concrete reading strategies: self-explanation, paraphrase, prediction, association and monitoring. The results indicate that better students used a wide range of strategies to construct meaning. Monitoring, a skill which is often cited as important to comprehension (Reutzel & Cooter, 2005) is evident in all the think-aloud protocols. The weaker students identif.....

Thesis Published 2007 3942 hits Available

A framework for choosing appropriate open source learning management system

Mohamad Ali Ahmad Zamzuri,

Article Published 2010 3436 hits Available

Teenagers self-identity who experience internet addiction

Fillamenta, Novdaly

Abstract

An Adolescence that called teenager started from the age of 11 or 12 years until the early twenties. The main thing that happens in adolescence is the search for identity. Human identity can occur over the internet where when communication persists between individuals who connect in interaction within it, each individual determines itself as a member of a group, accepts the values of the group, accepts the role of an individual from the group members, as well as determine differences and similarities with group members who included in such interactions.. This study uses descriptive quantitative method that is intended to see how the image of self identity in adolescents who experience internet addiction. Data collection using self-identity scale and internet addiction scale and data analysis using descriptive statistic. Research shows that the majority of subjects are on the status of achievement identity 37 people (35.19%), followed by subjects who are on the status of moratorium iden.....

Article Published 2018 639 hits Available

Investigating usability guidelines in developing mobile application

Mohammed Siti Asma, Abd Aziz Noor Azah, Ariffin Asma Hanee,

Article Published 2016 8434 hits Available

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