Manila Journal of Science 11 (2018), pp. 22-31

Aircraft Noise Assessment in a Mixed Urban–Residential Hamlet and the Possible Role of Tree Cover in Noise Abatement in Pajac, Lapu-Lapu City, Philippines

Abstract
Pollution is a big issue in the Philippines. However, the country has not focused its attention towards noise pollution. This study assessed the noise intensity of a hamlet located very near the airport, where aircraft takeoffs and landings occur daily. It compares the noise intensity (in decibels) between areas with tree cover and those without. Read More

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Anti-G-Hermiticity Preserving Linear Map That Preserves Strongly the Invertibility of Calkin Algebra Elements

 

Abstract

 

A linear map ψ : X → Y of algebras X and Y preserves strongly invertibility if ψ(x−1) = ψ(x)−1 for all x X−1, where X−1 denotes the set of invertible elements of X. Let B(H) be the Banach algebra of all bounded linear operators on a separable complex Hilbert space H with dim H = ∞. A Calkin algebra C(H) is the quotient of B(H) by K(H), the ideal of compact operators on H. An element A + K(H)C(H) is said to be anti-G-Hermitian if (A + K(H))# = −A + K(H), where the #-operation is an involution on C(H). A linear map 𝜏 : C(H) → C(H) preserves anti-G-Hermiticity if 𝜏 (A + K(H))# = −𝜏 (A + K(H)) for all anti-G-Hermitian element A + K(H)C(H). Read More

. Posted on October 30, 2017 by Manila Journal of Science
Manila Journal of Science 11 (2018), pp. 11-21

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Prevalence, Antigenic Recognition and IgG Antibody Response in Pigs Infected with Sarcoptes scabiei var. suis in Confined Pens

 

Abstract

Hog mange is a serious pruritic dermatitis caused by the itch mite Sarcoptes scabiei var. suis. The itch mite has remained a severe ectoparasite of utmost importance to the pig industry, especially with the environment promoting its spread. The ubiquity cum difficulty in diagnosing and treatment has led to great economic losses. This study aimed at evaluating the prevalence and antigenic recognition spectra of confined pigs in a resource poor community in Ogbomosho, South-West Nigeria. Read More

. Posted on October 13, 2017 by Manila Journal of Science
Manila Journal of Science 11 (2018), pp. 1-10

Giardiasis and its Associated Risk Factors Among School Children in Selected Rural Communities in South Eastern Nigeria

Abstract

The study was conducted to determine the prevalence of giardiasis among school children in Afikpo North Local Government Area, Ebonyi State, Nigeria. The study was carried out from June to October, 2015. Direct smear, iodine wet mounts, and the formol-ether concentration technique were used to analyze the stool samples. Out of 600 stool samples from pupils aged 5-16 years from six primary schools examined, 30 (5.0%) were infected. Read More

Manila Journal of Science 10 (2017), pp. 131-135

Updates on the Cecilia P. Reyes Collection of Philippine Thrips (Insecta: Thysanoptera)

Abstract

The Cecilia P. Reyes Collection of Philippine thrips consists of 38 new species involving 9 new genera, namely, Amphidoxothrips Reyes, Filipinothrips Reyes, Gemmathrips Reyes, Hemingia Reyes, Praeciputhrips Reyes, Propealiothrips Reyes, Propesolomonthrips Reyes, Psephenothrips Reyes, and Rosingothrips Reyes, and hundreds of thrips specimens known to science. The insects were collected from different localities in Luzon including Mindoro and Palawan, Visayas, and Mindanao (Reyes, 1994, 1996, & 1997). Read More

Manila Journal of Science 10 (2017), pp. 126-130

On Modular Signatures of Some Autographs

Abstract

Let G = (V, E) be a graph where the edge set E can be a multiset. If there exists a bijection α: V → S(G) where S(G) is a multiset of real numbers such that uvE if and only if |α(u) − α(v)| = α(w) for some wV, then α is called an autograph labeling of G. The multiset S(G) = {α(v) : vV} is called a signature of G. If the underlying set of S(G) is {0,1,2,…,n − 1} where n = |V|, then S(G) is called a modular signature of G. Read More

Manila Journal of Science 10 (2017), pp. 114-125

Surface Analysis of Silicon (100) Wafer After Contact Electrification Using Kelvin Force Microscopy

Abstract

Contact electrification was demonstrated on Si (100) wafer, and surface charge images at submicron scale were analysed using Kelvin force microscopy (KFM). Potential map images have shown carpet-like patterns on the (100) plane of Si wafer. Individual potential spikes that appeared on the surface are indicative of the presence of charges arising from contact electrification. Read More

Manila Journal of Science 10 (2017), pp. 101-114

Status of Coral Communities and Reef-Associated Fish and Invertebrates in Batangas and Northern Palawan

Abstract

The present study shows the status of certain reefs of Batangas and northern Palawan using data gathered with volunteers, community members, local governments, and civil society groups utilizing Reef Check® methods. Both provinces have mean densities of less than 1 per 100 m2 for most of the fish and invertebrate indicators—signifying that they are overfished. Read More

Manila Journal of Science 10 (2017), pp. 87-101

Diversity and Phylogenetic Relationships Among Isolated Root Symbiotic Fungi from Drynaria quercifolia L. in La Union, Philippines

Abstract

Drynaria quercifolia is an epiphytic fern often exposed to water- and light-stressed environments. One distinct ecophysiological adaptation of epiphytic ferns is their symbiotic relationship with fungi. This is the first study undertaken to explore the phylogenetic relationship, colonization, occurrence rate, and diversity of RSF found in D. quercifolia. Two hundred seventy-eight RSF isolates were collected from 300 representative root segments. Genomic DNA of the RSF was extracted, and the ITS (internal transcribed spacer) region of the 18S ribosomal DNA (rDNA) was sequenced. Thirteen species were recorded. Eight of the 13 RSF were identified up to the species level using the Basic Local Alignment Search Tool nucleotide search program (BLASTn) to their closest type match available on the databank of NCBI. However, five RSF were undescribed. Read More

Manila Journal of Science 10 (2017), pp. 75-86

Sponsored Game With Fuzzy Coalitions

Abstract

Sponsorship is a way of expressing support where an individual or group gives provision (financial or in other forms) to an event, activity, person, or organization. When it comes to business, the two involved parties in a sponsorship are expected to engage in a mutual trading relationship so that each one expects to gain some benefit. In 2012, Nocon’s study introduced a game that models sponsorship, called sponsored game. In this type of game, there are two sets of players: the sponsors and the team players. Read More