SR5: Reactions of Pomacea canaliculata (Golden Kuhol) to Aqueous Leaf Extracts of Azadirachta indica (Neem) in Laboratory Conditions

AQUILES ARANETA
Researcher

SY 2007-2008

DARWIN Q. LUMOSBOG
Project Adviser

The research was presented at the 2007 Regional Science Fair, Life Science Individual- Cluster 1 by Alvier Lopena, in the absence of Aquiles. It won 3rd. This study tested the mollusk-killing activity of aqueous neem (Azadirachta indica) leaf extracts on Pomacea canaliculata, the snail that is infesting on Philippine farmlands. It was so endeavored to help Filipino rice farmers have better harvest by wiping out the kohol population through a simply prepared molluscicidal extract.

ABSTRACT

The reactions of kuhol or Pomacea canaliculata to the aqueous leaf extracts of neem or Azadirachta indica applications in laboratory conditions were investigated. The reaction referred here to was on the mortality that the extract caused on the said snails. Equal amounts of leaves and water were used to prepare the aqueous extracts, which were grouped into 10 mL and 20 mL treatments. The greatest molluscicidal effect was observed in 20 mL extracts and it was on the small snails that the extract caused the highest mean mortality of 96.7%. The mortalities among small snails applied with different amounts of extracts did not significantly differ, with an F – value of 1.000 whose level of significance was .347. Therefore both extract amounts are molluscicidal to the small snails. A mean mortality of 80.0% was observed on the medium sized snails. The mortalities among medium sized snails differ significantly with varying amounts of extract, with an F – value of 10.139. Therefore, more medium sized snails are killed using 20 mL extract. This project further found out that there was no significant difference in mortalities between the medium and small-sized snails applied with varied amounts of neem leaf extract.

SR4: A Fumigation Gadget against Mosquitoes from Thrown-away Tin Can

Joelibie Barroca, Researcher, School Year 2007 - 2008/
Mr. Darwin Lumosbog, Adviser

This study proposed a design that could be used for anti-mosquito fumigation. Any mosquito-repellent materials can be used with it. It is made from thrown-away cans. It is looked forward to that the junked can would become an invaluable material for fumigation especially in the barangays or in camping areas where there are no available commercial repellents. It won third in Individual, Cluster 1 Physical Science during the 2007 Regional Science Fair.

ABSTRACT

The practicability and efficiency of a fumigation gadget made from tin can were explored through two-group ratings. A regular sized sardine tin can was designed into a fumigation gadget following the principles of oxygen combustion. Pieces of paper were used as fire starter. The upper fillings were dried chopped leaves of mosquito repellent Madre de cacao. The time it took to smoke and the numbers of repelled caged mosquitoes were counted. Result showed an average of 3.30 - minute fumigation. The fumes were concentrated at the start of fuming. 100% of the caged mosquitoes were repelled. For practicability, a mean of 8.6 was rated by group A and a mean of 7.6 by B. The T –test analysis revealed that such ratings did not significantly differ with a t – value of 1.043, which had a significance level of .328. On the efficiency, the mean rating given by group A was 9.00 and 9.20 for B. With a t – value of -.232, it was said that the ratings did not significantly differ from each other at a level of .822. It was then concluded that the gadget was both practical and efficient. The researcher therefore recommended that this gadget be tried out in the households, camping sites and other mosquito vulnerable areas.

SR3: Filtrating Setup for Detergent-Rich Sewage

RENE PASTER
EUNICE JOY PANES
SY 2007-2008
Researchers

MR. DARWIN Q. LUMOSBOG, Project Adviser

This study proposed a design for filtrating detergent – rich sewage. Alternative filtrating setups should be installed before the sewage gets into the river. In this project, pebble, coarse sand and pound charcoal are used as filtrating agents in a setup that would at any rate, minimize the pollutants, particularly those from detergents that could contaminate the river waters. It won 3rd in the 2007 Regional Science Fair - Cluster 1, Physical Science Team.

ABSTRACT

The feasibility of a model of a set up to filter aqueous detergent

mixtures was studied. The setup was constructed out of a used 1.5 liter plastic container using pebbles, sand and pound charcoal enclosed by fine nets. A detergent mixture was poured on its opening end and the time intervals of 5 and 10 minutes were observed in collecting filtrates. Result showed that 80% of the observers found the filtrate clear and 20% said it was somewhat clear. The mean amount of 49.8 mL and 93.7 mL were obtained in 5 and 10 minutes intervals, respectively. Statistical comparison resulted in a significant t-value of -11.157, implying that the filtrate production was time-dependent. The mean pH values of the original aqueous mixture and the filtrate were 11.34 and 9.14, respectively. Statistical assessment turned out a significant t-value of 21.783, which meant that the alkalinity of the original mixture was way higher than that of its filtrate. Generally, the setup produced clearer and pH-lower filtrate. Additionally, its filtration depended on time.

SR2:Larvicidal Activity of Aqueous Gliricidia sepium Madre de Cacao) Extract Against Mosquito Larvae

Researchers: Connie S. Alingayao and Manilyn M. Parado, SY 2007 - 2008/ Project Adviser: Mr. Darwin Q. Lumosbog

This was one of the entries of the Division of Zamboanga Sibugay to the 2007 Intel Philippines Regional Science Fair. The researchers were interested on addressing the issue on Dengue infection by the mosquitoes. The students thought of a way to minimize population growth of mosquitoes by eradicating their larvae. They won third place under Cluster 1 - Life Science, Team Category.

ABSTRACT

The larvicidal property of crude aqueous Madre de cacao extract against mosquito larvae was studied. Extracts were taken from fresh young stem’s scrapings and leaves mixed with equal parts of water. 20, 15 and 15 mL of the two extracts were independently treated on the 10 mosquito wrigglers suspended in 5.0 mL rain water in separate Petri dishes. Five trials were done for all the setups. All the groups were undisturbed for 24 hours. The greatest mortality was observed in 20 and 15 mL leaf extract with both means of 9.4 (94% mortality, with n=5). Over-all results showed that the leaf extract had the most number of larvae killed with a mean of 9.00 at n=15. With a t – value of 16.508 the difference was significant, so leaf extract showed greater larvicidal activity than the stem extract. ANOVA on the comparison of larval mortality among leaf extracts resulted in an F – value of 1.500. With a significant level of .262 there was no significant difference in the number of larvae killed among the leaf extracts of different amounts. This project found out that Madre de cacao exhibits larvicidal property and that its leaf extract had a better action compared to that of its stem.

SR1: Absorptive Capacity of Rice Hull, Rice Straw, Rice Hull Ash and Coconut Husk on Engine Oil

This research was the official entry of the Division of Zamboanga Sibugay to the 2006 Regional Science Fair. The study won 2nd Place under Cluster 1 - Physical Science, Team Category. The experiment was conducted in relation to the oil spill in Guimaras sea waters, brought about by the sinking of MT-Solar 1 Tanker.

Rene Paster, Angelly Quiming, Eunice Panes
(Researchers) School Year 2006 - 2007

ABSTRACT

This research aimed to find out the engine oil-absorbing capacity of coconut husk and rice waste products like hull, hull ash and straw.

The media were separately mixed with engine oil and the amounts of engine oil absorbed were determined. Results showed that rice straw absorbed the greatest amount with a mean amount of 33.83 g and the rice hull ash got the lowest with a mean of 19.1667 g. ANOVA Test Results revealed an F – value of 17.701, which is significant with a level of .001 (@ alpha = .05).

POST HOC revealed that the amount of oil absorbed by rice straw did not differ significantly with that of coconut husk. Therefore they are equally good oil absorbers. The amount of oil absorbed by rice hull and rice hull ash differs significantly with that of rice straw and coconut husk. Therefore rice straw and coconut husk are better oil absorbers than rice hull and rice hull ash