Penyelidikan tinjauan ini bertujuan menentukan tahap kemahiran penaakulan saintifik (KPS) pelajar Sains, Matemaik dan Kejuruteraan (SMK) di Institusi Pengajian Tinggi Awam Malaysia (IPTA),stail pengajaran pensyarah (SPP) serta hubungan antara KPS dan SPP. Seramai 975 pelajar daripada enam buah universiti terlibat dalam kajian ini dan dipilih secara teknik persampelan rawak berstrata. Terdapat dua instrumen kajian iaitu Ujian Kemahiran Penaakulan Saintifik dan Soal Selidik Stail Pengajaran Pensyarah. Statistik deskriptif seperti frekuensi, peratus dan min serta pekali korelasi Pearson digunakan untuk menganalisis data. Dapatan kajian menunjukkan tahap kemahiran penaakulan saintifik dalam kalangan kebanyakan pelajar masih berada pada tahap operasi konkrit. Dua stail pengajaran pensyarah yang dominan menurut persepsi pelajar adalah pakar dan pemberi kuasa. Walau bagaimanapun kajian menunjukkan terdapat korelasi negatif yang lemah antara tahap kemahiran penaakulan saintifik dengan stail pe.....

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Anatomy and morphological characters were employed to identify four samples of Tacca sp. (Belimbing Tanah) from different localities in Perak. Anatomical characters including leaf epidermal characters, leaf venation, type of stomata and trichomes were investigated through transverse sections, epidermal peel and leaf clearing procedures. The outline and vascularization of the sections were also investigated. Result has shown that Tacca from four different localities in Perak were similar anatomically. However, morphologically these four species can be differentiated mostly based on their leaves, flowers and fruits. The leaf margins are slightly different of either entire or denticulate, and the colours of floral bracts are either purplish-black or purplish-black at the base gradually turns white to the apex. Eventhough they are slightly different morphologically, Tacca of Gunung Lang and Gunung Liang were suggested as T. chantrieri based on dichotomous key of Kalkman which emphasizes on.....

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Sargassum polycystum is a species of brown algae (Phaeophyta). Some recent studies have found many uses of this algae, one of them is for medicine. In this study, crude hexane, dichloromethane and methanol extracts of Sargassum polycystum were tested for toxicity activity and screened for its principal chemical substances. The toxicity test was done using Brine Shrimp Lethality (BSL) test against Artemia salina Leach. The results of this study showed the LC50 value of methanol extract was 295.12 mgml-1, while both hexane and dichloromethane extracts were 275.42 mgml-1. The BSL test exhibited no significant toxicity against A.salina. Phytochemical screening shows S. polycystum contained non polar and polar components. As the conclusion, S. polycystum contained secondary metabolites that are not toxic to A. salina and they are not a potential source for toxicity...

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Disruption of the ADG gene in Arabidopsis results in 6% increase of total fatty acids in mature desiccated seeds. A starchless mutant of Arabidopsis thaliana, ADP glucose pyrophosphorylase (adg1-1) has been investigated concerning the lack of starch in its leaves. In this work of metabolic analysis of adg1-1 mutant, there was very little or no starch accumulation throughout seed development. Even though the growth of these mutant plants was delayed, seed development of the mutants did not show much difference from the wild type. In mature desiccated seeds, there was no significant difference in the seed dry weight of the mutant compared to the wild type. The adg1-1 mutant showed a shift in carbon partitioning to fatty acid (FA) and sucrose accumulation. Major changes have occurred in FA 18.0 (stearic), FA 18.1 (oleic) and FA 18.2 (linoleic). In mature seeds of adg1-1, there was a 70% increase in FA 18.2, a 75% increase in FA 18.1 and a 76% reduction in FA 18.0. The results show that th.....

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