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Total records found : 22
Simplified search suggestions : Khoo Yin Yin
12011
article
Infestations by the bagworms Metisa plana and Pteroma pendula for the period 1986-2000 in major oil palm estates managed by Golden Hope Plantation Berhad in peninsular Malaysia
Ho Cheng Tuck, Ibrahim Yusof, Khoo Khay Chong,
Metisa plana Walker and Pteroma pendula Joannis are important pests of the oil palm, Elaeis guineensis Jacquin, which is the primary agricultural crop in Malaysia. Although there is a history of integrated management of the bagworms, information gaps exist with regard to their incidence, biology, dispersion and population dynamics. Such new information is needed to improve the current integrated management of these pests. Analysis of historical records of bagworm infestations over 63 955 ha of oil palm in 69 estates in Peninsular Malaysia showed M. plana and P. pendula to be the primary pests. Infestations were of single or mixed species, and ranged from nil to 7811 ha yr-1. Cumulative infestations were 18 297 ha, 4904 ha and 14 607 ha for single species of P. pendula and M. plana, and for mixed species of P. pendula and M. plana, respectively. This shows P. pendula to be the predominant species, and is attributed to its ability to survive very wet weather (>200 mm rain per month) and .....

2044 hits

22015
thesis
Extraction and isolation of alkaloids from the leaves of alseodaphne corneri (Lauraceae)
Jennie, Khoo Hui Chen
This phytochemical study is aimed to extract, isolate and identify alkaloids from Alseodaphne corneri leaves. The crude alkaloid was extracted by cold percolation followed by acid-base extraction until Mayer test showed negative result. Then, it was separated by conventional chromatographic methods using column chromatography and preparative thin layer chromatography. The structural elucidation of isolated alkaloids was then carried out by spectroscopic techniques; UV, IR, NMR and HRESIMS. The structures of the compounds were also determined by comparison with previous study. Isolation of alkaloids yielded one new benzylisoquinoline; (6,7- dimethoxyisoquinolinyl)-(2',5'-dihydroxy-4'-methoxyphenyl)-methanone 68, one bisbenylisoquinoline; obamegine 49, one oxoaporphines; atheroline 71, and five aporphine; isocorydine 48, N-methyllaurotetanine 51, laurotetanine 53, lirioferine 69 and norlirioferine 70. The benzylisoquinoline type alkaloid, lirioferine 69 and atheroline 71 were first repor.....

2041 hits

32012
article
Dispersion of the bagworms Pteroma pendula and Metisa plana in oil palm
Ho Cheng Tuck, Ibrahim Yusof, Khoo Khay Chong,
An attempt was made to determine optimum sampling unit of between-palm and within-palm distribution of bagworms and their interspecific association distribution in oil palm using aggregation indices or distribution models. The within-frond distribution of bagworms varied significantly within the oil palm crown. Peak bagworm density was recorded between frond numbers 9 and 19. Through polynomial regression, standardised residual and relative net precision analyses, frond number 17 was established as the representative sampling unit for experimental work, and frond numbers 10-19 should be used when a greater precision is required as in life-table construction. A lack of interspecific association suggested these sampling units to be applicable for single and mixed infestations. Evaluation of between-palm dispersion revealed that Taylor’s Power Law gave a more appropriate fit with highly significant r2 values for all categories of assessment. The bagworms were regularly dispersed in oil .....

1870 hits

42013
article
Outcome-Based Education : an approach for teaching and learning development
Abdul Karim Noor Al-Huda, Khoo Yin Yin,
This conceptual paper attempts to provide an understanding of the importance of outcome-based education (OBE) approach for teaching and learning development. As a theory of education, OBE has certain beliefs and assumptions about learning, teaching and the systemic structures within these activities. The results of OBE approach are expressed in terms of individual student learning and they are expected to achieve the two long-term benefits : i) OBE is able to measure ‗what the students are capable of doing‘ and ii) OBE goes beyond ‗structured tasks‘ by demanding that students demonstrate their skills through more challenging tasks. The OBE system also can be benefited when the outcomes are used to guide instructional planning. In Malaysia, the OBE system is implemented by the Malaysia Quality Agency (MQA). The Agency holds the task to improve the quality of human capital in the country from three main aspects namely, knowledge, skills and attitude...

1540 hits

52014
article
Isolation of aporphine alkaloid from the leaves of Alseodaphne corneri Kosterm
Khoo Jennie, Hui Chen, Ahmad Kartini, Hasnan Muhammad Hafiz Husna, Mohammad Siti Nor Fadzilah, Awang Khalijah, A. Hadi A. Hamid, Nafiah Mohd Azlan,
A phytochemical study on the leaf extract of Alseodaphne corneri Kosterm involving extraction, separation by using various chromatographic methods and structural determination by spectroscopic technique such as ultraviolet spectra (UV), infrared spectra (IR), nuclear magnetic resonance (NMR) and mass spectra (MS) was carried out. The isolation and purification from the leaves of Alseodaphne corneri Kosterm yielded two aporphines: norlirioferine and lirioferine...

5142 hits

62019
article
Learning economics concepts with music videos among preservice teachers
Khoo, Yin Yin
The purpose of this paper was to foster the conceptual understanding through music videos among pre-service Economics teachers. Students’ learning interest towards music video was also examined. A quantitative research method with descriptive survey design was employed in this study. A total of 90 pre-service teachers were employed as respondents. The findings indicated that music video contributes significant results towards students’ performance, and interest. Further research will focus on qualitative research.  ..

634 hits

72013
article
Extraction and isolation of alkaloids from the leaves of Alseodaphne corneri Kosterm
Nafiah Mohd Azlan, Khoo Jennie,Hui Chen, Mohammad Siti Nor Fadzilah, Awang Khalijah, A. Hadi A. Hamid, Ahmad Kartini,
The isolation and purification of the leaves extract of Alseodaphne corneri Kosterm yielded four alkaloids; norisocorydine 1, isocorydine 2, 2-norobamegine 3 and obamegine 4. This phytochemical study involves extraction, separation by using various chromatographic methods and structural determination by spectroscopic technique such as ultraviolet spectroscopy (UV), infrared spectroscopy (IR), nuclear magnetic resonance spectroscopy (NMR) including 1D-NMR (1H, 13C and DEPT), 2D-NMR (COSY, NOESY, HMQC/HSQC, and HMBC) and mass spectrometry (MS). The IC50 value of antiplasmodial activity for isocorydine 2 and obamegine 4 are 0.50 μmolL-1 and 0.14 μmolL-1 respectively...

4818 hits

82014
article
Refleksi tenaga pengajar terhadap kepemimpinan distributif dan tekanan kerja dalam pendidikan teknik dan vokasional
Rabindarang Siva, Khuan Wai Bing, Khoo Yin Yin,
Kepemimpinan mempengaruhi tekanan kerja dalam kalangan tenaga pengajar. Tekanan kerja menyebabkan prestasi dan kualiti kerja menurun. Oleh itu, gaya kepemimpinan yang lebih fleksibel dan bercorak perkongsian perlu diamalkan dalam sistem pendidikan. Tujuan kajian ini adalah untuk menentukan perkaitan di antara kepemimpinan yang bercorak perkongsian iaitu kepemimpinan distributif dan tekanan kerja dalam pendidikan teknik dan vokasional. Kajian ini adalah berbentuk kualitatif iaitu temu bual separa berstruktur. Responden kajian dipilih dengan teknik persampelan bertujuan iaitu mempunyai minima setahun pengalaman mengajar dalam pendidikan teknik dan vokasional. Seramai empat responden iaitu tenaga pengajar daripada pendidikan teknik dan vokasional telah dipilih untuk sesi temu bual. Data kajian dianalisis dengan kaedah analisis kandungan. Data temu bual dikumpul dan dianalisis dengan mentranskripsi temu bual secara verbatim, dikod dan dikategorikan mengikut tema. Dapatan kajian menunjukkan.....

1068 hits

92017
article
Kemampuan memiliki rumah dalam kalangan keluarga bandar di Malaysia
Malek Nor Malina, Samsurijan Mohamad Shaharudin, Khoo Suet Leng, S. Gopal Parthiban, Hamat Zahri,
1518 hits

102017
thesis
Keberkesanan penggunaan peta pemikiran I-Think dalam menyelesaikan masalah Matematik berayat dalam kalangan murid tahun lima
Khoo, Yee Ping
Kajian ini bertujuan menilai keberkesanan penggunaan peta pemikiran i-Think bagi menyelesaikan masalah matematik berayat dalam kalangan murid Tahun Lima. Pembinaan modul i-Think Penyelesaian Masalah Matematik Berayat (iPMMB) adalah berdasarkan adaptasi model ADDIE. Pendekatan kuantitatif dalam bentuk kuasi eksperimen telah digunakan dalam kajian ini. Pemilihan subjek kajian telah dijalankan secara persampelan berkelompok yang melibatkan 55 orang murid di sebuah Sekolah Rendah Jenis Kebangsaan di daerah Hilir Perak. Tiga instrumen kajian digunakan iaitu modul iPMMB, borang soal selidik dan ujian pencapaian iaitu ujian pra dan ujian pasca. Data dianalisis dengan analisis deskriptif dan inferensi. Analisis deskriptif menjelaskan minat murid dalam menyelesaikan masalah matematik berayat dengan peta pemikiran i-Think, manakala analisis inferensi pula melibatkan ujian-t bagi menunjukkan perbezaan antara pemboleh ubah kajian. Hasil dapatan menunjukkan bahawa penggunaan peta pemikiran i-Think .....

1721 hits

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