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Nusantara Science and Technology Proceedings
Published by Future Science
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Arjuna Subject : Ilmu Ekonomi, Ekonometrika dan Keuangan (semua kategori) - Ilmu Ekonomi, Ekonometrika dan Keuangan (Lain-Lain)
Articles 73 Documents
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Search results for , issue "4th International Seminar of Research Month" : 73 Documents clear
Metagenomic Sequencing Analysis and Microbial Identification on Various Landcover Rossyda Priyadarshini; Elly Syafriani; Medina Uli Alba Somala; Amir Hamzah
Nusantara Science and Technology Proceedings 4th International Seminar of Research Month
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2019.0471

Abstract

Soil degradation will affect the availability of soil nutrients. Microbes role was important in supplying soil nutrient. How is microbes supply the nutrients can be learned through the metagenome technique. Metagenome is one of the molecular techniques that can identify microbial communities from soil samples that are used quickly and precisely. Through the metagenome technique, not only information about the identity of microbial species can be obtained, but also the enzymes produced, which will affect the soil nutrients availability. This study aims to detect and identify the impact of land cover types on microbial types. Soil samples were taken under agricultural land (LP) and agroforestry (AF). Each type of land cover was taken at 4 (four) different locations. The method used in this research is a molecular-based species identification method through metagenome analysis. This study showed that there are variations in microbial species in various types of land cover. This information is important for sustainable agricultural management in the future. Our study showed that on all of the land cover types, Proteobacteria were the most abundant phylum in all of the land cover patterns. Among them, s_Sphingomonas_melonis; f_Sphingomonadaceae; g_Sphingomonas; c_Alphaproteobacteria; p_Proteobacteria; and o_Sphingomonadales were the most abundant in the LP groups, while p_Acidobacteria and c_Deltaproteobacteria were the most abundant in AF groups. This composition of soil metagenomic was associated with the soil physic-chemical properties, especially pH and soil organic matter.
Mapping Sea Surface Temperature and Its Correlation with The Acidity of Sea Water on the Coast of Kwanyar Madura Island Siti Zainab; Novie Handajani; Hendrata Wibisana
Nusantara Science and Technology Proceedings 4th International Seminar of Research Month
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2019.0472

Abstract

Sea surface temperature is one parameter to determine the condition of the ecosystem of a waters, besides that there are other parameters, namely the acidity of sea water which is a number that indicates the degree of an ac id and base of the aquatic environment, where generally the coastal environment has an acidity value below 8 so that changes from this value will disrupt life as a whole for the coastal environment. The purpose of this study is to find a mathematical model of SST and pH that can describe the situation of the coastal area, where as a case study is the Kwanyar coast in Bangkalan district, Madura Island. The method developed here is the least square method to find the optimum mathematical model of these parameters, in addition to that by calculating the algorithm of several channels of visible wavelengths owned by Aqua Modis images which are 412 nm, 531 nm and 667 nm. The results obtained from this study are for the optimum wavelength of sea surface temperature is 667 nm while for pH is 531 nm. From the statistical analysis for the t-test carried out, the results showed no significant correlation between sea surface temperature with a pH value where both parameters showed a statistically low correlation value with an error rate of 5% and the existing Pearson correlation test equipment. The conclusion is that for the Kwanyar Bangkalan coastline the temperature is still in the normal threshold as well as the existing pH value, only these two parameters cannot be stated as a causal relationship, where the temperature rise will have an impact on pH changes and vice versa.
Synthesis and Characteristics of Calcium Phosphate from White Mussel Shell Srie Muljani; Ketut Sumada; Nove Kartika
Nusantara Science and Technology Proceedings 4th International Seminar of Research Month
Publisher : Future Science

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.11594/nstp.2019.0473

Abstract

Biomaterials are materials that have been developed for repair, recovery of function, and replacement of diseased or damaged parts of the body especially in cases of fractures. The material for biomaterial that is commonly used is calcium phosphate (Ca3(PO4)2). The purpose of this research is to synthesize calcium phosphate and study its characteristics. The source of calcium carbonate in this study was from white mussel shells. The experiment was carried out by reacting calcium carbonate (CaCO3) and phosphoric acid (H3PO4) to form the liquid phase of calcium phosphate. The calcium phosphate solution was filtered and the filtrate obtained was added with a solution of NaOH as a pH controller, stirred using a magnetic stirrer in the time range from 10 to 50 minutes to form a calcium phosphate crystal. Filtration is carried out to separate the calcium phosphate crystals from the solution. The results showed calcium phosphate products containing 62% of ?-dicalcium phosphate (?-Ca2P2O7) and 38% of hydroxyapatite (Ca10(PO4)6(OH)2) so that it could be stated that the product was biphasic calcium phosphate. The raw material of white mussel shell powder was analyzed using X-Ray Fluorescence (XRF), while the calcium phosphate solution was analyzed by Spectrophotometry, Gravimetry, and AAS (calcium test). Hydroxyapatite products were analyzed by XRF, XRD (X-Ray Diffraction), FTIR (Fourier Transform InfraRed), and SEM (Scanning Electron Microscopy).

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