Undergraduate Theses
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Item Bioactivity-guided screening of selected plants from UPV Miag-ao campusArceo, Ma. Ofelia H. (Division of Physical Sciences and Mathematics, College of Arts and Sciences, University of the Philippines Visayas, 1998-05)Twelve selected ethnomedically-used plants were screened for alkaloids, saponins, and flavonoids. Nine out of twelve plants contained at most two of the phytochemicals tested, and three showed the absence of these phytochemicals. Methanolic extracts of three selected plants (Stachy/arpheta /amaicensis, Hyptis suaveo/ens, Semecarpus philippinensis) were examined for antibacterial activity against Staphylococcus aureus. Bacillus subtilis, Escherichia coli, and Pseudomonas aeruginosa. All extracts were found to be active at least against two of the microorganisms tested. The extract of Siachytarphe/a jamaicensis was found to be active against three out of four microorganisms and found to be the most bioactive. Stachyiarpheta jamaicensis was subjected to bioactivity-guided fractionation using solvents of increasing polarity - hexane, ethyl acetate, and n-butanol. The hexane extract was considered as the most bioactive fraction. Its chromatogram contained seven spots in which four turned blue violet after spraying with vanillin-H2SO4. The color change exhibited suggests the possible presence of saponins.Item Community structure of a ten-year old naturally, regenerating mangrove stand in Baguingin, Tigbauan, IloiloAnimas, Ruphil May J. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1999-04)The structure of the mangrove community in Baguingin, Tigbauan was studied using the transect line plot method with seven plots established. Community structure is described in terms of the following parameters: basal area, stems per hectare, relative density, relative frequency, relative dominance, and importance value of the species and the Shannon Index of Diversity. Variations in these parameters are correlated with certain physico-chemical factors-- air and water temperature, soil pH, water salinity, land elevation- and the degree of human influence. Three true mangrove species were found in the area: Excoecaria agallocha, Avicennia marina, and Avicennia alba. A. marina was found to have the highest relative density of 70.8%. relative dominance of 52.35% and importance value of 169.82. A. marina and A. alba have equal relative frequency of 46.67%. Seedlings and saplings of A. marinadominate the area, indicating that the community is a young and regenerating stand. Basal area significantly increased from sea to land ( 53.68 cm2 to 431.66 cm2) and from creek to land ( 8.83 cm2 to 366.54 cm2). Shannon Index of Diversity gave a result of 0. The very low diversity index means that there is uneven distribution of individual trees among the species, and only a few kinds of species were present and are centered around only two genera, Avicennia species and Excoecaria agallocha.Item Growth of the telescope snail, telescopium telescopium (Linne) in brackishwater pondsApistar, Jobert H. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines, 1998-04)Samples of T. telescopium were collected every month, from April to October 1997 for 6 months, in brackishwater ponds. Allometric relationships were defined by comparing shell length with shell width, as well as various body weight proportions including total weight with shell, total volume with shell, visceral weight and visceral volume. A total of 5 cohorts with growth rates ranging from 0.45 - 0.67 mm-day- were observed using the Bhattacharya analysis. A high mean growth rate of 0.56 mm-day- (sd = 0.07, n= 5) was estimated by joining the modes of the cohorts between successive sampling months. Low inverse correlations were observed between mean shell length and various environmental parameters (i.e. salinity, air temperature, water temperature and organic matter content) possibly explained by the species' environmental adaptations. On the other hand significant correlation was observed between mean shell length and density, indicating the possible role of overcrowding in these habitats.Item A comparison on the effect of light on melanophore differentiation in the larval stage of frog, Hyla sp.Araneta, Merrie Celine E. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1996-03)Three set-ups were exposed to different experimental conditions namely: set-up A. under prolonged light: set-up B. under prolonged darkness: set-up C. under normal condition. Observation was done under the dissecting microscope from the first appearance of melanophores until the migration was stabilized. The pattern of differentiation was observed to be the same in all set-ups. only the distribution and the color intensity differred. B was the darkest and C was the lightest. It only showed that light could not, alter the pattern of melanophore differentiation, only the distribution.Item Fears of Doña Montserrat Lopez Memorial High School students, Silay City, Negros OccidentalArcenas, Maricar D. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1994-04)The study focuses on the different types of fears of Doña Montserrat Lopez Memorial High School students in Silay City, Negros Occidental. The aim of the study is to identify the different types of fears of Doña Montserrat Lopez Memorial High School students? to determine the most intensely Feared abject and the least intensely feared object on every fear category. For every gender, per year levels and to determine whether there is gender difference on the reported intensity for each type of fear, per year level. There were 245 respondents, 85 of which were Freshmen, 51 were Sophomores, 64 were Juniors, and 45 were Seniors. The respondents were selected through stratified random sampling using proportional allocation. The design that was used in this study is the survey. A questionnaire and a checklist were used to identity the different types of fear of the respondents and the trend of its intensity. The trend of the intensity on the different types of fear were measured using the formula of the average score and the T test formula. The findings showed that Doña Montserrat Lopez Memorial High School students have fear of supernaturals, animals, nature natural calamities; man-made calamities; means oF transportation; places; fear of certain criminals; and fear of crimes. The intensity report showed that there are similarities and differences on the reported most intensely feared objects and least intensely feared object on the different fear categories, per year level. Furthermore, the result of the study also showed that there is no gender difference on the intensity report on most feared objects per year level.Item Academic performance of UPV Iloilo High School students admitted under the democratized admission schemeApalacio, Reymund D. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1993-04)As its contribution to the enhancement of the social welfare of people, especially the poor, in a poor developing country like the Philippines, a government university like UP has embarked on a policy democratized education which includes the scheme of democratized admission at the UPV Iloilo High School. This paper undertook action research, which is the applications of tools and methods of social science to immediate, practical problems, to determine the academic performance of economically poor students admitted under the new, democratized admission scheme of the UPV Iloilo High School. It was found out that generally they perform as well as their better-off counterparts under the old scheme (with tuition fees).Item Larval rearing of Scylla serrata Forskal: The effect of Artemia salima and Brachionus plicatilis as food on the growth and survival of zoeaApote, Ma. Noemi G. (Division of Biological Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1996-11)A study was conducted to find out tile effects of Artemia, Brachionus and a combination of Anemia and Brachionus as food on the survival of mudcrab Scylla serrata Forskal zoea and the ability of the zoea to metamorphose to megalopa stage. The study composed of three experiments. Each experiment lasted for 21 days. Results showed highest mean percent survival (66.7±2.03) on zoea fed with a combination of Anemia and Brachionus at a feeding density of 5 individuals/ml each. When the density of Brachionus was increased from 5 individuals/ml to 12 individuals/ml in the combination diet, there was an increase in the survival of the zoea to 68.9±2.41. Highest metamorphosis from zoea to megalopa was also obtained on those fed with a combination of Anemia and Brachionus. This combination diet also gave the shortest number of days for the zoea to metamorphose to the next stage which also resulted to the least number of days for megalopa production to start. The study also revealed that larvae ted with a combination of Anemia and Brachionus reared at 30 ppt salinity got high survival on the first three days of culture, however starting on the 4th day up to the 15th day of culture, those reared at 28 ppt obtained higher survival although not statistically different from the other salinities tested.Item Effect of varying levels of cotton (Gossypium sp.) seed meal on the spermatogenesis of mice (Mus musculus)Abonador, Luena A. (Division of Social Sciences, College of Arts and Sciences, University of the Philippines Visayas, 1992-04)Cottonseeds procured from Western Colton Corporation, Oton, Iloilo were dehulled, cleaned by hand, and ground using a mortar and pestle. Ground cottonseed meal (CSM) was incorporated in varying amounts into the basal diet so that diets contained varying levels (0,10,20,30 g) of CSM per 100 g formulated diet. These were then pelletized at the Nutrition and Feed Division, Aquaculture Department (AQD), Southeast Asian Fisheries Development Center (SEAFDEC), Tigbauan, Iloilo. A total of thirty-two 20-day-old male mice (16 white and 16 black) were randomly distributed to four dietary treatments, each with four replicates. After a 5-day acclimatization period, during which the mice were fed with the basal diet (0% CSM), the four experimental diets were given to the randomly selected experimental animals for another 35 days. The mice were subsequently sacrificed, and histological examination of the testes was conducted. Differential count of sperms was done to evaluate the effects of varying levels of CSM on the spermatogenesis of mice. The data obtained were analyzed statistically using analysis of variance followed by Duncan’s Multiple Range Test. There was no significant difference in the sperm counts of the two strains of mice. However, significant differences (P<0.01) were noted in sperm counts of mice at various levels of CSM in the diet. Likewise, significant differences (P<0.01) were observed between 0% and 20 or 30%; 10% and 20 or 30%; 20% and 30% CSM in the diet. No significant difference was noted between sperm counts of mice fed with 0% and 10% CSM levels. Slight degeneration of the seminiferous tubules and predominance of immature stages (spermatogonia) were observed in the testes of mice fed with diet containing 30% CSM.