Judul: Studi Karakteristik Habitat dan Biologi Katak Serasah Leptobrachium hasselti Tschudi 1838 di Situ Gunung, Sukabumi
Abstrak: Increasing development has caused the deterioration of amphibian habitat, including that of the leaf litter frog Leptobrachium hasselli. On the other hand, data and information on the bio-ecology of L. haselti is curentlyinsufficient. Therefore a study on the species ecology is required as the first step toward its conservation. This research aims to study habitat characteristics of L. haselti and the species biology in two different sites in Situ Gunung. Habitat data was collected using several methods. Transect was used in vegetation composit analysis. Canopy cover, leaf litter depth and air temperature was measured in each plot, while air teperature and humidity was measured at the start and end of each survey . L. hasselti population was sampled using 4x4 m plot placed perpendicular to each bodis of water. Each plot was classified according to its distance from the water bodies to study the distribution and density of each sex species (males, females and juveniles). L. haselti diet and reproduction biology was studied with a sample of 50 frogs consisting of 18 males and 12 females.
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Judul: Taxonomic Evaluation of Leptobrachium hasseltii (TSCHUDI) based on Morphological, Acoustic, and Molecular Analysis
Abstrak: Leptobrachium from Southeast Asian populations was first described as Leptobrachium hasseltii Tschudi with type species from Java. Taxonomic reassessment revealed that the Leptobrachium group was a cryptic species due to similarities in their morphological appearance. Leptobrachium hasseltii is then separated into two groups; Sumatran and Javan populations, and Bali populations. Thus, this study aims to evaluate the taxonomic status of L. hasseltii based on morphological characters, bioacoustic and molecular analyses on the populations of Sumatera, Java, and Bali. I analyzed the morphological data, bioacoustic and phylogenetic analyses of L. hasseltii populations from Sumatera, Java, and Bali to evaluate their exact taxonomy position. The genetic material used is mitochondrial DNA gene sequences 16S rRNA. Phylogenetic trees are reconstructed using Maximum Likelihood (ML) and Bayesian Inference (BI) analyses. I used Leptobrachium specimens stored in the Museum Zoologicum Bogoriense (MZB). Approximately 21 morphological characters were measured with digital calipers and an ocular micrometer with a precision of 0.01 mm. Advertisement call characteristics from each population are described, including series of the call, the number of notes per call, note repetition rate, and characteristics of each note. Phylogenetic results shoId Leptobrachium sp. from Bali was separated from all the Sumatran and Javan populations, this result is supported by morphometric data, which its cluster clearly separated from other populations, and its also supported by bioacoustic results, which have a significantly different character. Here I confirmed the possibility of new species Leptobrachium, by combinations of phylogenetic relationship, morphological and morphometry, and bioacoustic analyses.
Keyword: Leptobrachium, taxonomy, phylogenetic, morphology,, bioacoustic

Judul: Sintesis Nanopartikel ZnO dengan Stabilisator Nonilfenol Etoksilat dan Aplikasinya sebagai Pigmen Coating Antikorosif
Abstrak: Zink oksida (ZnO) merupakan material yang telah lama digunakan dalam industri cat organik karena memiliki sifat yang ramah lingkungan. Nanopartikel ZnO disintesis dengan metode presipitasi dengan tambahan surfaktan nonilfenol etoksilat sebagai stabilisator. Pencirian dengan difraksi sinar X menunjukkan keberadaan puncak-puncak khas yang serupa dengan partikel ZnO dalam keadaan curah dengan ukuran dimensi 18-50 nm. Nanopartikel ZnO sebagai inhibitor korosi mampu meningkatkan kinerja cat dalam menghambat terjadinya korosi. Efektivitas inhibisi korosi cat dengan nanopartikel ZnO mencapai 99.13% pada komposisi nanopartikel 3% dengan aplikasi cat 6 lapis. Peningkatan komposisi nanopartikel ZnO dalam cat yang berlebih dapat memengaruhi sifat fisik cat dalam hal kekasaran dan rendahnya elastisitas coating.
Keyword: antikorosif, nanopartikel ZnO, surfaktan nonilfenol etoksilat, surfaktan nonilfenol etoksilat