Investigatory Project
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Insecticidal Property of Acacia Seeds and Bark Against Termites

Insecticidal Property of Acacia (Samanea saman) Seeds and Bark Against Termites (Coptotermes vastator). A study on the insecticidal property of Acacia seeds and bark against termites was conducted to find out if these could be used against termites. The experiment was conducted at the laboratory of the Bureau of Soils in Lipa City and in Lumbang National High School from September to October 2005. The effort was initiated to enrich the laboratory activities in Chemistry and Biology for high school students.

Para-Toluenesulfonate Doped Polypyrolle as EMF Electrode Source

A conducting polymer was synthesized from polypyrolle doped with paratoluenesulfonate (p-TS) using electrochemical deposition technique to find a substitute for metal electrodes in EMF sources. Samples were produced with varying p-TS molarity, specifically 0.1, 0.15, and 0.2 M. Initial characterization of samples was done using Scanning Electron Microscope (SEM) for surface analysis, and the Energy Dispersive X-ray system (EDX) for elemental analysis. Surface analysis of thin sheets was observed to be fibrillar, while thick samples had globular surface. Traces of Nitrogen, Carbon, Oxygen and Sulfur in decreasing order of concentration, were detected in the EDX system, showing potential as conducting material.

Soundcard as Analog to Digital Converter

PC based water level control system using soundcard as analog to digital converter. Water level controllers ensure that appropriate amounts of water or fluids are dispensable or maintained in various agricultural and industrial applications. However, they are extremely expensive, costing as much as US$1,695.00 for flexible and programmable units. The main cost accounts for data acquisition cards and software.

The study developed a PC based water level monitoring and control system using the computer sound card as the analog-digital converter. The water level was monitored using silver rod (Cu-Ag alloy) as sensor. An electronic signal generator circuit was fabricated to produce the sine wave signal analog equivalent to the silver rod resistance changes for input to the computer.

Post harvest Shelflife of Table Bananas with Chitosan Coating

Techniques to manipulate the ripening of fruits transported from the farmland to the market are varied but they are either complicated or expensive. For small farmers and even fruit vendors, the use of chemical agents to delay the ripening of fruits is seldom resorted to. For large fruit dealers, paraffin waxes and chemical coatings, which are inedible, are used. Chitosan coating is one agent that has been proven to delay the ripening of non-climacteric fruits (e.g. apples, oranges, peaches). However, this has not been extensively studied among climacteric fruits (e.g. tropical fruits such as papaya, bananas, mangoes).

This study used chitosan coating to manipulate such ripening in table bananas (Musa sapientum). The concentration at which this worked better was determined and the quality of the fruits with treatments were evaluated. Powdered shrimp exoskeletons were obtained for the production of chitosan.

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