Nacional L.M.,Mariano Marcos State University |
Kang S.-J.,Gyeongsang National University |
Choi B.-D.,Gyeongsang National University
Fisheries and Aquatic Science | Year: 2012
Carotenoids were found in high levels in both muscle and tunic samples, with the highest and lowest values observed in March and January, respectively. The average values in muscle (GM) and tunic (GT) harvested in Geoje were 49.1 mg/100g and 56.7 mg/100g, respectively, whereas those in muscle (TM) and tunic (TT) harvested in Tongyeong were 42.0 mg/100g and 50.2 mg/100g, respectively. The total phenol contents of the tunic were not significantly different (P < 0.05) between sampling area and month. We investigated the antioxidative activities of the carotenoids against linoleic acid peroxidation [1,1-diphenyl-2-picrylhydrazyl (DPPH)] and hydroxyl radicals as well as their reducing power. The DPPH radical scavenging activity was 7.6-13.5% in GM, which is relatively weak, whereas it was 21.1-29.9% in GT, 9.6-12.4% in TM and 19.3-24.1% in TT. In comparison to α-tocopherol, the carotenoids were found to have strong inhibitory effects against linoleic acid peroxidation, and exhibited strong hydroxyl radical scavenging activities and reducing power at 120 μg/mL of each sample. © The Korean Society of Fisheries and Aquatic Science.
Manzano Jr. V.J.P.,Mariano Marcos State University |
Mizoguchi M.,University of Tokyo |
Mitsuishi S.,AINEX Co. |
Ito T.,X Ability Ltd
Paddy and Water Environment | Year: 2011
A demonstration study on Information Technology (IT) field monitoring was conducted in a rice field under the System of Rice Intensification (SRI) environment in Shinshiro City, Aichi Prefecture, Japan. The IT system used in this study consisted of an intelligent sensor node web-server that is equipped with in situ camera and sensor networks for agrometeorological, soil, and plant growth monitoring. Dynamic changes in soil moisture, water level, agrometeorological, and environmental conditions were measured and monitored. With this precision farming set-up, understanding and easy assessment of the salient field conditions and phenomena such as cyclic soil wetting and drying as well as critical crop growth stages were made possible. Based on the findings of the demonstration experiment, the system was effective, reliable, and efficient in monitoring soil moisture parameters and agrometeorological information in remote rice field environment. The actual field conditions were captured well by a combination of images, numerical, and graphical data sets. With this precise information, the frequency of irrigation was found to be every 7 days. The rice field was irrigated up to a moisture level of 0.592 m3/m3 (~600 mV) and allowed to be depleted to a moisture level of 0.417 m3/m3 (~400 mV). With this alternate drying and wetting method (AWD), a 25.71% of irrigation water was saved. In this study, rice production was made more scientific and more reliable. Hence, the use of IT field monitoring system represented a viable medium for the realization of better rice productivity which leads to the ethic of sustainable agriculture. © 2010 Springer-Verlag.
Orpia C.B.,Mariano Marcos State University |
Mapa D.S.,University of the Philippines |
Orpia J.C.,Magat Inc.
Journal of Environmental Management and Tourism | Year: 2014
Wind energy is the fastest growing renewable energy technology. Wind turbines do not produce any form of pollution. Moreover, when strategically positioned the wind turbines blend with the area’s natural landscape. In the long run, the cost of electricity using wind turbines is cheaper than conventional power plants since it does not consume fossil fuel. Wind speed modeling and forecasting are important in the wind energy industry starting from the feasibility stage to actual operation. Forecasting wind speed is vital in the decision-making process related to wind turbine sizes, revenues, maintenance scheduling and actual operational control systems. This paper uses econometric models to forecast the wind speeds of turbines in the Northwind Bangui Bay wind farm located in the Province of IlocosNorte, Philippines, using the Vector Auto Regressive (VAR) model. The explanatory variables used are local wind speed, humidity, temperature and pressure generated from the meteorological station in Laoag City, Province of IlocosNorte, Philippines. The use of VAR model, using daily time series data, reveals that wind speeds of the turbines can be explained by the past wind speed, the wind speed in Laoag City, humidity, temperature and pressure. Results of the analysis, using the forecast error variance decomposition, show that wind speed in Laoag City, temperature and humidity are important determinants of the wind speeds of the turbines. © 2014 ASERS Publishing House. All rights reserved.
Juinio-Menez M.A.,University of the Philippines at Diliman |
Bangi H.G.P.,University of the Philippines at Diliman |
Bangi H.G.P.,Mariano Marcos State University
Marine Ecology Progress Series | Year: 2010
Experiments were conducted to determine the effects of water conditioned with Sargassum (i.e. fresh and ground Sargassum and excreta of Sargassum-fed Tripneustes gratilla) as well as the effects of adult sea urchins (i.e. Salmacis sphaeroides and T. gratilla), larval age and parentage on the settlement and metamorphic rate of full-sibling batches of T. gratilla larvae. The majority of larvae (35 to 57 d old) settled within the first hour of the assays, but significantly more settled and metamorphosed completely in the conditioned water treatments than in the control (boiled filtered seawater). Completely metamorphosed larvae in the control treatment indicate that specific cues are not necessary to induce settlement and metamorphosis of competent larvae. However, habitat cues enhanced metamorphic rate significantly. Complete metamorphosis occurred earlier in Sargassum treatments, and the number of completely metamorphosed larvae was significantly higher in the ground Sargassum treatment. Observations of early juvenile aggregations on Sargassum further suggest that algal metabolites may enhance benthic recruitment. The sensitivity of sea urchin larvae to waterborne cues differed among larval age groups. Older batches of larvae metamorphosed faster, particularly in the ground Sargassum treatment, while the intermediate age group also had high metamorphic rates in both sea urchin treatments. There were significant differences in metamorphic rate among full sibling batches of larvae of the same age, as well as significant interaction between batch and treatment over time. Results indicate that differences in the age of competent larvae and genetic factors affect the ability of larvae to detect cues to initiate and complete metamorphosis. © Inter-Research 2010, www.int-res.com.
Villanueva R.D.,University of the Philippines at Diliman |
Romero J.B.,Mindanao State University |
Ragasa A.L.R.,University of the Philippines at Diliman |
Ragasa A.L.R.,Mariano Marcos State University |
Montano M.N.E.,University of the Philippines at Diliman
Phycological Research | Year: 2010
The worldwide production of the gelling agent agar mainly rely on the red algae of the order Gracilariales and Gelidiales for raw material. We investigate here the potential of a species from another red algal order, Ceramiales as an agar source. The agar from Laurencia flexilis collected in northern Philippines was extracted using native and alkali treatment procedures and the properties of the extracts were determined using chemical, spectroscopic and physical methods. The native agar, 26% dry weight basis, forms a gel with moderate gel strength (200 g cm-2). Alkali-treatment did not enhance the gel strength, indicating insignificant amounts of galactose-6-sulfate residue, the precursor of the gel-forming 3,6-anhydrogalactose (3,6-AG) moieties. Furthermore, the Fourier transform infrared and chemical analysis showed low sulfate and high 3,6-AG levels, not affected significantly by the alkali treatment. Nuclear magnetic resonance spectroscopic analysis revealed 3-linked 6-O-methyl-D-galactose and 4-linked 3,6-anhydro-L-galactose as the major repeating unit of the native extract, with minor sulfation at 4-position of the 3-linked galactose residues. The native and alkali treated agars have comparably high gelling and melting temperatures, whereas the former exhibits higher gel syneresis. Laurencia flexilis could be a good source of agar that possesses physico-chemical and rheological qualities appropriate for food applications. Due to the inability of alkali treatment to enhance the key gel qualities of the native extract, it is recommended that commercial agar extraction from this seaweed would be done without pursuing this widely-used industrial procedure. © 2010 Japanese Society of Phycology.
Ragasa C.Y.,De La Salle University - Manila |
Guardamano J.D.,De La Salle University - Manila |
Tan M.S.,De La Salle University - Manila |
Ulep R.A.,Mariano Marcos State University |
van Altena I.A.,University of Newcastle
Research Journal of Pharmaceutical, Biological and Chemical Sciences | Year: 2016
Chemical investigation of the dichloromethane extract of Dioscorea luzonensis Schauer. led to the isolation of 9-hydroxy-10E,12Z-octadecadienoic acid or α-dimorphecolic acid (1) from the skin of the tuber. The structure of 1 was elucidated by extensive 1D and 2D NMR spectroscopy and confirmed by mass spectrometry.
Magdaluyo Jr. E.R.,University of the Philippines |
Rivera Virtudazo R.V.,Mariano Marcos State University |
Dela Cruz L.P.,University of the Philippines |
Castriciones E.V.,University of the Philippines |
Mendoza H.D.,University of the Philippines
Journal of Ceramic Processing Research | Year: 2010
Quezon City, PhilippinesThe stability of biphenyl-functionalized ethane-silica hybrid materials was investigated by a calcination process, a hydrothermal test and exposure to UV to determine the integrity of its composition, structure, and morphology. The organosilicas were prepared via surfactant-mediated polymerization of 4,4'-bis(triethoxysilyl)biphenyl organosilane monomer and crosslinked with 1,2-bis(triethoxysilyl)ethane and tetraethoxysilane. Infrared spectroscopic and gravimetric analyses showed that the material was thermally stable below 700 oC. Its hydrothermal stability could be accounted for by the strong covalent integration of the bifunctional organic bridging groups in the silica framework. No significant change was observed in the functional groups when the material was exposed to ultra-violet radiation. Post heat treatment of the materials did not significantly change the interplanar spacing of the (100) plane, but enhanced the spherical particle morphology.
Cha-um S.,National Science and Technology Development Agency |
Batin C.B.,Mariano Marcos State University |
Samphumphung T.,National Science and Technology Development Agency |
Kidmanee C.,National Science and Technology Development Agency
Australian Journal of Crop Science | Year: 2013
Remediation of salt affected soil using organic matter (OM) chelating agent is an effective procedure with low cost, simple and sustainable techniques. We investigated the physio-biochemical responses of two legume species viz. cowpea (Vigna unguiculata Walp.) and jack bean (Canavalia ensiformis [L.] DC.) to salt stress with a view to select model plant species for salt-remediation. Seeds of jack bean and cowpea were geminated, planted in the pot culture then the various salt concentrations (0, 50, 100, 150 and 200 mM NaCl) were treated and physiological and morphological data were collected. Sodium ions (Na+), free proline and relative electrolyte leakage in salt stressed seedlings of two legumes were significantly increased in response to increase salt stress. In contrast, potassium ions (K+), water use efficiency (WUE), chlorophyll a and chlorophyll b pigments in cowpea were sharply dropped when subjected to 200 mM NaCl salt stress for 66.81%, 86.14%, 61.35% and 65.62%, respectively, indicating the physiological declines in the salt stressed plants. The K+ reduction, WUE reduction and pigment degradation in salt stressed seedlings of jack bean were lower than those in cowpea, indicating as salt tolerant indices. Also, the maximum quantum yield (Fv/Fm) and photon yield of PSII (ΦPSII) were decreased for 26.02% and 30.18% in cowpea when seedlings exposed to 200 mM NaCl salt stress, leading to reduce net photosynthetic rate (Pn). A positive relation between ΦPSII and Pn was demonstrated in both jack bean and cowpea legumes. In addition, overall growth performances in salt stressed seedlings of two legumes were considerably declined. Jack bean was a candidate legume to play a role as green manure for saline soil remediation upon to salt tolerant ability.
Madalipay J.C.T.,Mariano Marcos State University
ACRS 2015 - 36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, Proceedings | Year: 2015
The province of Ilocos Norte, known to be an emerging renewable energy capital of the Philippines and the South East Asia, has paved its way in committing to reduce the carbon emission in our atmosphere with the clean generation of electrical energy through hydro power and wind farms with the latest addition of the 4.1-megawatt (MW) solar farm under the wind turbines of the 150-MW Burgos wind farm. Temperature has been a big factor in the production of electricity as it affects devices' efficiency and may lead to significant production loss particularly in harnessing solar energy. This study used Landsat 8 Operational Land Imager (OLI) of 30-m resolution and Thermal Infrared Sensor (TIR) data of 100 m resolution captured from 2014 to present to study the effects of temperature difference on solar power production for standalone photovoltaic (PV) systems and on-grid high powered PV systems. Photovoltaic panels was assumed to have been power tested at 25°C. Vegetation Cover and Normalized Difference Vegetation Index were derived using the optical bands. The two Thermal Infrared (TIR) bands was used to obtain the brightness temperature and land surface temperature. Results showed that production loss was higher in areas of low and no vegetation as temperatures in the area was higher.
Alibuyog N.,Mariano Marcos State University |
ACRS 2015 - 36th Asian Conference on Remote Sensing: Fostering Resilient Growth in Asia, Proceedings | Year: 2015
Satellite remote sensing data are used to study the distribution and estimate the areal coverage of the two most dominant crops, namely, rice and corn, in the Philippines. The EOS/Terra MODIS data were used to assemble a 15-year time series of monthly NDVI data over Northern Philippines at a resolution of 250m. The monthly data were used to investigate seasonal patterns of crops and to derive nine phenological parameters from the distributions of rice and corn in Northern Philippines, which in turn were used in conjunction with a maximum likelihood classifier to discriminate areas planted by rice and corn during the wet and dry seasons. Classification was done in areas that usually have two cropping seasons and where the starts of the planting seasons are consistent with those expected from climatology. The resulting maps show a spatial distribution of corn and rice crops during the wet and dry seasons that are generally plausible and found to be highly correlated and comparable, with some exceptions, to data published by the Bureau of Agricultural Statistics.