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Articles 1 - 19 of 19
Full-Text Articles in Plant Biology
Investigation Of Antioxidant And Cytotoxic Activities Of Portulaca Oleracea., Ong Kiah Ju
Investigation Of Antioxidant And Cytotoxic Activities Of Portulaca Oleracea., Ong Kiah Ju
Student Works (2010-2019)
Portulaca oleracea known as purslane in English or Gelang Pasir in Bahasa Melayu. Traditionally, this plant is used to alleviate pain and swelling. This plant is reported to exhibit many pharmacological effects such as antibacterial, analgesic, antiinflammatory and wound healing. In the present study, the experimental approach was based on bioassay-guided fractionation. The crude methanolic and fractionated extracts were initially investigated for their antioxidant and cytotoxic activities. The cytotoxic effects of the extracts were tested against five human cell lines namely the hormonedependent breast carcinoma cell line (MCF7), human nasopharyngeal cell line (KB), human cervical carcinoma cell line (Ca Ski), …
Production Ecology Of Brassica Juncea (L.) Czern. Var. Ensabi., Abbas Falah Toosi
Production Ecology Of Brassica Juncea (L.) Czern. Var. Ensabi., Abbas Falah Toosi
Student Works (2010-2019)
The Malaysian brassica (B. juncea var. Ensabi) with its distinct pungent aroma and bitter taste is now cultivated as a local plant among the Malays and natives of Sabah and Sarawak. The species is also used as a popular kimchi by the locals.Experiments were conducted to determine the effect of light, temperature regimes, salinity, drought stress and chemical media on seed germination and to assess clonal growth, structural demography and general growth patterns of B. juncea var.Ensabi. Fertilizer requirements, self-thinning, inter-plant spacing, assessment of the chemical nature and allelopathy activity of B. juncea var. Ensabi were also investigated in this …
Molecular Characterization And Expression Analysis Of Putative Rpk1 And Putative Clv1 In Malaysian Indica Rice (Oryza Sativa L.) Cv.Mr219 And Malaysian Wild Rice (Oryza Rufipogon) Irgc105491., Law Yee Song
Student Works (2010-2019)
Two candidate yield-related genes, putative Receptor-like Protein Kinase 1 (putative RPK1) and putative CLAVATA1 Receptor Kinase (putative CLV1), were selected for molecular characterization and expression analysis. This was carried out using in four rice lines comprising the parents and two BC2F7 lines from a local rice breeding program, with Malaysian rice variety, Oryza sativa ssp. indica cv. MR219 as recurrent parent, and Oryza rufipogon (IRGC105491) as donor parent. Approximately 2.8 kb and 2.6 kb putative RPK1 cDNA nucleotide sequences were obtained from Oryza rufipogon and Oryza sativa ssp. indica cv. MR219 respectively. However, only 402 …
Effects Of Plant Growth Regulators And Physiological Stresses On The Growth Of Bougainvillea Spp., Mohammed Saifuddin
Effects Of Plant Growth Regulators And Physiological Stresses On The Growth Of Bougainvillea Spp., Mohammed Saifuddin
Student Works (2010-2019)
This study was aimed to investigate the effects of physiological stresses such as pruning, shading, phloemic stress and plant hormones such as gibberellic acid (GA3) and naphthalene acetic acid (NAA) on the growth, development and flowering process of bougainvillea plants. The plants (Bougainvillea glabra and Bougainvillea spectabilis) were grown under prevailing conditions (temperature 21-32°C, maximum PAR 2100 μE m-2 s-1 and relative humidity of 60-90%) using completely randomized design. Field experiments as well as biochemical analysis were carried out at the Plant Physiology Garden and the Plant Physiology Laboratory, Institute of Biological Sciences, University of Malaya. Results on frequent pruning …
Development Of Protocols For Tissue Culture And Mutagenesis In Two Variegated Sansevieria Sp., Irmawati Akma Abdul Hapiz
Development Of Protocols For Tissue Culture And Mutagenesis In Two Variegated Sansevieria Sp., Irmawati Akma Abdul Hapiz
Student Works (2010-2019)
Studies were conducted to develop the tissue culture protocol and mutagenesis through Gamma ray irradiation for two variegated Sansevieria species known as Sansevieria trifasciata var. Laurentii (goldband Sansevieria) and Sansevieria trifasciata var. Hahnii (birdnest Sansevieria). Seven combinations of BAP and NAA were chosen which are represented by letter A= 1.00 mg/I BAP, B = 1.00 mg/I BAP + 0.25 mg/I NAA, C = 2.00 mg/I BAP + 0.50 mg/I NAA, D = 2.00 mg/I BAP + 1.00 mg/I NAA, E = 3.00 mg/I BAP + 1.00 mg/I NAA, F = 4.00 mg/I BAP + 1.00 mg/I NAA and G = …
Comparison Between In Vitro And In Vivo Antibacterial Activity Of Curcuma Zedoaria From Malaysia., Behrooz Banisalam
Comparison Between In Vitro And In Vivo Antibacterial Activity Of Curcuma Zedoaria From Malaysia., Behrooz Banisalam
Student Works (2010-2019)
The rhizomes of the Zingiberaceae family are vegetables widely used in many Asian countries and their medicinal functions have been broadly discussed and accepted in many traditional recipes. In this study, the antimicrobial activity of extracts of Curcuma zedoaria from Malaysia was compared between two systems as in vitro and in vivo. The comparison was performed against four bacterial strains including two gram negative strains (E.coli and Pseudomonas aeruginosa) and two gram positive strains (Bacillus cereus and Staphylococcus aureus) using the agar well diffusion method. Extracts were made in three different solvents; petroleum ether, chloroform and methanol extracts exhibited antibacterial …
Characterization Of Microrna172 And Its Potential Target In Oil Palm (Elaeis Guineensis Jaq.), Fatemeh Mehrpooyan
Characterization Of Microrna172 And Its Potential Target In Oil Palm (Elaeis Guineensis Jaq.), Fatemeh Mehrpooyan
Student Works (2010-2019)
Oil palm (Elaeis guineensis) is the world’s major perennial monocot crop and contributes highly to the economies of South East Asia. As the oil palm fruit is the source of the main economic output for this crop, floral development is a critical process related to oil palm productivity. miR172 has been shown to be an important regulator of the AP2 family transcription factors involved in floral timing in a number of plants and belongs to a group of highly conserved miRNA that can be identified based on sequence homology. Six oil palm miR172 paralogs, representing two distinct mature miR172 sequences, …
Phylogeographical Patterns Of Neobalanocarpus Heimii (Dipterocarpaceae) For The Evolutionary History And Chain Of Custody Certification., Tnah Lee Hong
Student Works (2010-2019)
Tectonic movement and climatic oscillations during the Cenozoic have had dramatic effect on the biota of the tropical rain forest. This study aims to reveal the phylogeography and evolutionary history of a Peninsular Malaysian endemic tropical timber, Neobalanocarpus heimii (Dipterocarpaceae), based on chloroplast DNA (cpDNA) variation. Fifteen haplotypes were identified from 10 intraspecific variable sites of five non-coding cpDNA regions: trnL intron, trnS-trnG spacer, trnG intron, trnK intron and psbK-trnS spacer. Two major genealogical cpDNA lineages of N. heimii were elucidated: a widespread southern and a northern region. The species is predicted to survive in multiple refugia during climatic oscillation: …
Studies Of Antioxidant Activity Of Bioactive Compounds Derived From Ardisia Crispa., Hassan Mahmood Kzar Jindal
Studies Of Antioxidant Activity Of Bioactive Compounds Derived From Ardisia Crispa., Hassan Mahmood Kzar Jindal
Student Works (2010-2019)
In recent times, researches have focused on medicinal plants in order to extract natural and low cost antioxidants that can help protect the human body against oxidative stress, and replace the synthetic additives that might be carcinogenic. In present study, the crude extracts of leaves and fruits from Ardisia crispa were investigated for their chemical constituents and antioxidant activity. Preliminary phytochemical screening of the crude extracts via TLC analysis revealed the presence of several secondary compounds mainly, terpenoids and phenolic compounds in addition to alkaloids and saponins. HPLC analysis showed the possibility of presence of gallic acid in the fruits …
Studies On The Bioactive Properties Of Selected Plant And Fermented Extracts., Saravana Kumar Sinniah
Studies On The Bioactive Properties Of Selected Plant And Fermented Extracts., Saravana Kumar Sinniah
Student Works (2010-2019)
The aim of this study was to isolate protein/peptide and secondary metabolites from plant and fermented sources. The extracts were used to test for antimicrobial and antioxidant properties. In the current study protein/peptide extracts of Allium sativum showed promising results with a 15mm inhibition zone against Escherichia coli, 28mm against Staphylococcus aureus, 16.3mm against Bacillus cereus and 9mm against Pseudomonas aeruginosa. The minimum bacteriocidal concentration (MBC) results showed that Allium sativum protein/peptide extract is only bacteriostatic and not bacteriocidal. Andrographis paniculata showed the most promising result for the ethanolic extracts with an inhibition zone of 14mm against B. cereus, 11.5mm …
A Systematic Study Of Fagraea Sensu Lato And A Revision Of The Peninsular Malaysian Taxa., Sugumaran Manickam
A Systematic Study Of Fagraea Sensu Lato And A Revision Of The Peninsular Malaysian Taxa., Sugumaran Manickam
Student Works (2010-2019)
systematic study of the Peninsular Malaysian species of Fagraea sensu lato was undertaken. This was done in the light of recent revisionary work done for Borneo that documented 20 new species and demonstrated that previous species concepts for Fagraea were too broad. Parallel to this the distinction of the subgeneric groups recognised as sections, i.e., Cyrtophyllum, Fagraea and Racemosae, were investigated with molecular phylogenetic methods. Representative taxa from the Malay Peninsula and Borneo augmented by sequences from other taxa in the same subtribe and tribe were used in the molecular analysis. Gene sequences from ITS, trnL–F (trnL intron + trnL–F …
Chemical Constituents Of Aglaia Lanuginose. King, Fadzly Adzhar Kamarulzaman
Chemical Constituents Of Aglaia Lanuginose. King, Fadzly Adzhar Kamarulzaman
Student Works (2010-2019)
Aglaia is a small genus of trees that belong to the family Meliaceae. They are widely distributed in India, Malay Peninsula and throughout Indomalesia. The chemistry of Aglaia has been extensively investigated and most of the researches done on these plants focused on their effect as insecticides, antifeedant, growth inhibitors, cytotoxicity and others. The dichloromethane extract from the bark of Aglaia lanuginose were studied. The chromatographic separation on both of the extracts gave ten compounds. The compounds isolated were identified as eichlerialactone 102, methyl eichlerianate 103, cabraleone 104, ocotillone 105, 4-hydroxycinnamyl acetate 106, cabralealactone 107, eichlerianic acid 108, shoreic acid …
Bioactivity And Chemical Investigations Of Pereskia Bleo And Pereskia Grandifollia., Sim Kae Shin
Bioactivity And Chemical Investigations Of Pereskia Bleo And Pereskia Grandifollia., Sim Kae Shin
Student Works (2010-2019)
Ethnopharmacological data has been one of the common useful criteria in drug discovery. Pereskia bleo and Pereskia grandifolia (Cactaceae), commonly known as ‘Jarum Tujuh Bilah’ in Malay and ‘Cak Sing Cam’ in Chinese have long been used as natural remedies in Malaysia. The experimental approach in the present study was based on bioassay-guided fractionation. The crude methanol and fractionated extracts of both Pereskia spp. were initially investigated for their biological activities such as antioxidant, antimicrobial and cytotoxic effect against five human cancer cell lines, namely nasopharyngeal epidermoid carcinoma cell line (KB), cervical carcinoma cell line (CasKi), colon carcinoma cell line …
Chemical Constituents Of Cryptocarya Densiflora., Nurul Nazneem Wan Othman
Chemical Constituents Of Cryptocarya Densiflora., Nurul Nazneem Wan Othman
Student Works (2010-2019)
The extraction of alkaloids from the Malaysian Cryptocarya densiflora has been carried out in this study. The alkaloids were extracted from the bark and leaves of this species using acid base extraction and the crude alkaloids obtained were subjected to extensive chromatographic techniques such as thin layer and column chromatography. The structural elucidation of the purified alkaloids were performed with the aid of spectroscopic methods i.e. 1H NMR, 13C NMR, 2D NMR, IR, UV and LCMS. Investigation of the alkaloidal content from the bark of Cryptocarya densiflora afforded six alkaloids and their structures were elucidated as laurotetanine 63, isocaryachine 64, …
A Study On Cell Suspension Cultures For Micropropagation And The Production Of Carpaine From Papaya (Carica Papaya L. Var. Eksotika)., Mohamad Fhaizal Mohamad Bukhori
A Study On Cell Suspension Cultures For Micropropagation And The Production Of Carpaine From Papaya (Carica Papaya L. Var. Eksotika)., Mohamad Fhaizal Mohamad Bukhori
Student Works (2010-2019)
Carica papaya L. is a member of Caricaceae family with four native genera. This fruit is economically important as in multi-purpose fruit produced for dessert and vegetable and is highly in demand for pharmaconomical trade particularly the plant compound as source of medicine. This species is a popular fruit crop in the tropical and sub-tropical regions of Malaysia, Thailand, Indonesia and the Philippines. It is also one of the most widely grown fruits in Malaysia and is mainly cultivated in Johor, Perak and Selangor. The Eksotika papaya variety was introduced to the farmers in the late eighties and this resulted …
Morphogenesis And Tissue Culture Studies Of Gerbera Jamesonii Bolus Ex. Hook F., Nor Azlina Hasbullah
Morphogenesis And Tissue Culture Studies Of Gerbera Jamesonii Bolus Ex. Hook F., Nor Azlina Hasbullah
Student Works (2010-2019)
In vitro regeneration of Gerbera jamesonii Bolus ex. Hook f. was successfully carried out in this study. Petiole and leaf explants from 8-week-old aseptic seedlings were used as source of explants. Different response was observed when different explants were cultured on the culture media. MS (Murashige and Skoog, 1962) supplemented with 2.0 mg/l BAP and 0.5 mg/l NAA was identified as the optimum medium for shoot regeneration, while petiole explant was identified as the most responsive explant in this study. Petiole explants regenerated shoots (94.3 } 2.5 %) and produced 9.3 } 0.6 shoots per explant. MS basal medium was …
Physiological And Biochemical Attributes Of Red-Fleshed Dragon Fruit, Hylocereus Polyrhizus., Punitha R. Vasanthan
Physiological And Biochemical Attributes Of Red-Fleshed Dragon Fruit, Hylocereus Polyrhizus., Punitha R. Vasanthan
Student Works (2010-2019)
An understanding of the postharvest parameters is essential for the successful market introduction of red-fleshed dragon fruit, Hylocereus polyrhizus, which has been recently developed as fruit crop. In this study, fruit at three different harvest maturities were evaluated in terms of physiological and biochemical aspects. Fruit which were harvested at complete red stage maintained their quality for up to one week. On the other hand, fruit harvested at early maturity attained the physical properties of fruit ripened on the plant (firmness reduced, peel colour changes, pH increased) but they contained noticeably lower concentrations of soluble sugars suggesting that fruit can …
Marine Algae As A Source Of Photosensitisers For Photodynamic Therapy Of Cancer., Tang Yee Voon
Marine Algae As A Source Of Photosensitisers For Photodynamic Therapy Of Cancer., Tang Yee Voon
Student Works (2010-2019)
Photodynamic therapy (PDT) involves the intravenous administration of a photosensitiser that preferentially localises in cancerous tissues more than the surrounding normal tissues. Subsequent illumination of photosensitiser generates reactive oxygen species that cause irreversible photo-damage to the cancer cells. To date, most photosensitisers that have been approved for clinical use or are currently in clinical trials are cyclic tetrapyrroles which are derived or inspired by naturally occurring chlorophyll and its degradation products. Some non-tetrapyrrolic photosensitisers have also been found in nature suggesting that there are potential photosensitisers with interesting structures in nature. To this end, this thesis outlines the collection of …
Studies Of Antioxidant And Angiotensin Converting Enzyme Inhibitory Activity Of Orthosiphon Stamineus (Misai Kucing)., Che Wan Imanina Che Wan Takwa
Studies Of Antioxidant And Angiotensin Converting Enzyme Inhibitory Activity Of Orthosiphon Stamineus (Misai Kucing)., Che Wan Imanina Che Wan Takwa
Student Works (2010-2019)
Abstract NA