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Total records found : 2
Simplified search suggestions : Khoo Yin Yin
12015
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.....

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22017
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 .....

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