http://umt-ir.umt.edu.my:8080/handle/123456789/880 FST 2026-04-05T16:51:37Z http://umt-ir.umt.edu.my:8080/handle/123456789/11162 Title: The allelopathic activity of striga asiatica extract on chlorella vulgaris (UMT-M1) Authors: Madiihah Che Hussain @ Che Hasan Abstract: Allelopathy is a common occurrence in plants and affects the growth of the reacting species either positive (stimulating) or negative (inhibiting). Allelopathic activity has been in many plant interactions such as weed on crops, crops on weeds and crops on crops. Weed allelopathy is important for the future agronomic applications especially in crops production. Striga asiatica has been known as the invasive weed species that inhibit the growth of important crops. The present study examined the allelopathic activity of Striga asiatica on microalgae Chiarella vulgaris (UMT-Ml) . Crude and supernatant extract of S. asiatica at two, four and six weeks of culture were tested using the algal plating assay with disc diffusion and agar well diffusion method. Results showed that crude extract of S. asiatica with agar well method causes positive allelopathic activity on the growth of Chlorella vulgaris (UMT-Ml) with formation of dense green zone around the agar well. The highest extract concentration, 50 mg/ml exhibited the highest stimulating allelopathic activity on the growth of Chlorella vulgaris (UMT-Ml) by showing the widest stimulating zone radius. The four weeks old of S. asitaca culture also contributed highest allelopathic activity with significance level at P<0.05. Allelopathic activity is dependent on the age of plantlets and concentration used on the microalgae. 2012-01-01T00:00:00Z http://umt-ir.umt.edu.my:8080/handle/123456789/10547 Title: A study of structural and physical properties of pva/tio2 composite polymer Authors: Mohd Khazimie Mahsan Abstract: Polyvinyl alcohol (PV A) is one of the prom1smg representatives of polymeric material. There are numerous proposals for its application in electronics, as well as packaging textiles and food products, due to its high clarity, lack of charge densities properties and excellent durability. The application of polymer especially polyvinyl alcohol (PV A) has generated much interest in various industries. In this polymer study, the main purpose of this study is to measure and understand the structural and physical properties and also the characterization of PV A/Ti02 composite polymer. In this research, properties of PV A/Ti02 composite polymers have been studied by several techniques. The samples were prepared by using solution casting technique. Then after that was the measurement to reveal the surface morphology of PV A/Ti02 composite polymer thin film. The image of the both PV A surface has been carried out by Scanning Electron Microscope (SEM). Infrared spectrometer was used to demonstrate the structure of PV A and whether the complexion that occur in the composite polymer structure. The result showed the bond group of PV A in range between 500 cm-1 and 4000 cm-1 • Then the composite also had been studied of their conductivity by using Electrochemical Impedance Spectroscopy (EIS). The highest conductivity of the composite had been known from this study which is 2.66x 10- 9 S cm-1. 2009-01-01T00:00:00Z http://umt-ir.umt.edu.my:8080/handle/123456789/10546 Title: A study of surface morphology and physical properties of polyvinyl alcohol and methyl cellulose (PVA/MC) thin-film Authors: Mohd Khairol Mohd Bakri Abstract: The application of polymer especially polyvinyl alcohol and methyl cellulose (PY A/MC) has generated much interest in various industry. In this research, characterization and properties of (PYA/MC) has been studied by several techniques. For the first method measurements reveal the surface morphology of PY A/MC in a form of powder and thin film. The image of the both PY A/MC surface has been carried out by Scanning Electron Microscope (SEM). Infrared detector was used to demonstrate the structure of PY A/MC. The result showed the bond group of PY A/MC in range between 500 cm-1 to 4000 cm- 1• The EIS was conducted in order to determine the conductivity of the PY A/MC sample. The conductivity of the samole found to be between 1.035 x 10-5 to 9 x 10-6 scm-1 . 2009-01-01T00:00:00Z http://umt-ir.umt.edu.my:8080/handle/123456789/10545 Title: Improvement of corrosion resistance of aluminum using super-hydrophobic method Authors: Mohd Alif Osman Abstract: A novel super-hydrophobic film was prepared by Livingston solution chemically adsorbed onto the aluminum. A superhydrophobic surface was prepared on aluminum substrate. The film formation and its structure were characterized by means of Fourier transformation infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The formation of a composite interface composed of the flower-like surface nanostructures, water droplet and air trapped in the crevices was suggested to be responsible for the superior water-repellent property. The corrosion behavior of the super-hydrophobic surface was investigated with potentiodynamic polarization measurements and electrochemical impedance spectroscopy. Due to the 'air valleys' and 'capillarity' effects, the corrosion resistance of the material was improved remarkably. 2009-01-01T00:00:00Z