PENGARUH PANJANG SERAT TERHADAP SIFAT BENDING PAPAN KOMPOSIT POLIESTER BERPENGUAT SERAT BUAH LONTAR

The need for wood as a building material is increasing, but the existing forest conditions are difficult to meet the demand. Several alternatives have been developed as an effort to overcome the lack of wood, for example by creating wood derivative products such as fiberboard, particle board, and cement board. The raw materials for making fiberboard usually use natural fibers derived from plants containing fibers such as kenaf, banana, hemp, sisal, lontar and flax. The prospect of fiberboard development is very potential, because Indonesia has a suitable climate overgrown by these fibrous plants.The purpose of this study is to determine the effect of fiber length on the bending properties of polyester composite board reinforced by palm fibers. The material used in this research is lontar fibers with fiber length 1 cm, 2 cm and 3 cm and polyester resin. Before the fiber is used as a reinforcing medium, the fibers are first treated with 5% alkali by soaking for 1 hour. After the fibers were removed, then rinsed with clean water to free the fiber from alkali and then dried. The ratio of fiber-matrix composition used in this study was adjusted to the rule of mixture (ROM), wherein the volume fraction of fiber (Vf) used was 30%. The composite board is made by hand-lay-up method and continued with 24 hours by pressing with hydraulic jack. Furthermore, the molded composite is cut into bending test specimen according to ASTM D790 standard. The nature of bending of composite board is known through the process of testing three point bending by using universal testing machine.The result of bending test shows that the test specimen with 3 cm fiber length has a higher bending strength value of 18.42 Mpa, while the composite with 2cm fiber length is 16.35 Mpa and 15,44 Mpa for 1cm fiber length. Keywords: composite, lontar fiber, fiber length, bendin

UJI TOKSISITAS EKSTRAK KARANG LUNAK SARCOPHYTON SP ASAL TIMOR TERHADAP LARVA ARTEMIA SALINA LEACH

Research on toxicity test of Sarcophyton sp. extract from Timor against Artemia s. Leach Nauplii has been conducted. Sarcophyton sp. from Paradiso beach, Kupang, was macerated in n-hexane, ethyl acetate, and methanol then each macerate was evaporated at 400C and 450C to dry. The dried extract resulted was tested its secondary metabolite content and toxicity using Brine Shrimp Lethality Test (BSLT). The results showed that the methanol extract contains saponins, phenols, and steroids while the ethyl acetate extract contains steroids and terpenoids. The toxicity test against artemia showed that the methanol extract from Sarcophyton sp. is very toxic to the nauplii with LC50 value of 29,56 ppm while the ethyl acetate extract is classified toxic and gave LC50 value of 34,11 ppm

Sintesis Etil Stearat dari Reaksi Esterifikasi Asam Stearat dan Etanol Menggunakan Katalis Asam Sulfat

The study about Synthesis of Ethyl Stearate through Esterification   Reaction of Stearic Acid and Ethanol Using Sulfuric Acid Catalysis had carried out. The purpose of this study is to know how to synthesize Ethyl Stearate from esterification reaction of stearic acid and ethanol using sulfuric acid catalyst. Characterization of Ethyl Stearate compound was done using FT-IR and GC-MS. The study result exhibits that the yield of Ethyl Stearate product obtained is 98.85 %. Through characterization using FT-IR and GC-MS can be concluded that Ethyl Stearate compound is successfully synthesized and its purity reaches 98.87%

PENURUNAN KADAR LOGAM KADMIUM PADA UDANG (Peanaeus merguiensis) DENGAN PERENDAMAN CUKA NIRA ENAU (Arenga pinnata)

A research on the decrease of cadmium (Cd) content in shrimps by soaking them in palm (Arenga Pinnata) vinegar has been done. This study aimed to determine the removal percentage (%) of cadmium from shrimp after immersed in palm (Arenga Pinnata) vinegar and to determine the concentration and immersion time optimum in reducing the cadmium metal content in shrimps. The research was conducted in several steps namely sample preparation, determination of optimum concentration of vinegar, simulation of shrimp pollution, sample soaking in palm (Arenga Pinnata) vinegar and determination of cadmium content in samples. A two-way ANOVA test (α = 0,05) showed that the variation of palm (Arenga Pinnata) vinegar concentration has significant effect on reducing Cd content, while contact times have no significant effect on the reduction of Cd content in shrimps. It was found that the optimum concentration of palm (Arenga Pinnata) vinegar was 2% and optimum immersion time was 30 minutes. The removal percentage (%) of cadmium content from shrimps using palm vinegar reached 98.84%

Purification of Timor’s Genoak (Acorus calamus ) Essential Oil using Reduced Pressure Distillation

A research about Asaron oil purification produced over Stahl distillation has been done. This research was conducted by distillation of Genoak’s roots, rhizomes and leaves whilst the purification was carried out through reduced pressure distillation. A yellowish oil was yield respectively 1,83 gram from the roots and rhizomes and 1,26 gram from leaves which then was revealed as 90,49% pure of asaron confirmed using GC-MS, 1H-NMR and FT-IR analysis

UJI TOKSISITAS EKSTRAK AIR DAUN KELOR (Moringan oleifera, L) ASAL LAHAN KERING NUSA TENGGARA TIMUR

Moringa Oleifera (Moringa oleifera Lamk) found excessive growth in dry East Nusa Tenggara (NTT) province. The plant has not only been primarily consumed as food especially for its leaves but also is rich in nutrients in its fruits to roots, benefits as coagulants, vitamins, and medicines.  This research studied the toxic effect of the water extract of Moringa leaves to Artemia Salina Leach shrimp larvae according to BST method using water (room temperature) as a solvent, a preliminary study of the antibacterial and the anticancer target of study of the Morinaga. Moringa leaves were macerated for 3 x 24 hours using water, the results of phytochemical tests identified secondary metabolic content, among others, alkaloids, flavonoids, triterpenes, and tannins. The results of the BSLT test showed that the water extract (room temperature) of Moringa leaves had a toxicity level against Artemia Salina Leach as indicated by an LC50 value of 888, 34 less than 1000 ppm. It can be concluded that Moringa leaves have potential as a plant which can later be used as anti-bacterial and anti-cancer

Identifikasi dan Uji Aktivitas Antioksidan Senyawa Alkaloid Daun Pepaya (Carica papaya L.) Kultivar Lokal

Penelitian ini bertujuan untuk mengetahui senyawa alkaloid dan nilai kekuatan antioksidan IC50 dari ekstrak etanol daun pepaya (Carica papaya L.)  kutivar lokal menggunakan metode eksperimental Laboratorium. Analisis menggunakan LC-MS diperoleh senyawa alkaloid karpain dengan memiliki berat molekul 479 g/mol. Hasil uji aktivitas antioksidan diperoleh nilai IC50 ekstrak daun pepaya kutivar lokal A maupun kultivar lokal B adalah 34 ppm dan 10,4 ppm. Hal ini dapat memperlihatkan bahwa kedua ekstrak tersebut tergolong antioksidan kuat

Analisis Kandungan Metabolit Sekunder dan Uji aktivitas Antibakteri Jamur Endofit Batang Binahong (Anredera COrdifiolia Steenis)

The isolation of endophytic fungi (penicillium sp) from binahong stem had been undertaken with the objective to determine its content of secondary metabolites and its antibacterial activity. The content of secondary metabolites was analyzed with HPLC and its antibacterial activity was measured using paper disc diffusion method. The results showed that there were four compounds in the HPLC chromatogram detected at 235 nm. The antibacterial activity for methanol and ethyl acetate extracts were observed for its diameter of zone inhibition at 18.2 mm and 16.7 mm for S.aureus and 17.8 mm and 16.3 mm  for E. Coli

Search for dark matter produced in association with bottom or top quarks in √s = 13 TeV pp collisions with the ATLAS detector

A search for weakly interacting massive particle dark matter produced in association with bottom or top quarks is presented. Final states containing third-generation quarks and miss- ing transverse momentum are considered. The analysis uses 36.1 fb−1 of proton–proton collision data recorded by the ATLAS experiment at √s = 13 TeV in 2015 and 2016. No significant excess of events above the estimated backgrounds is observed. The results are in- terpreted in the framework of simplified models of spin-0 dark-matter mediators. For colour- neutral spin-0 mediators produced in association with top quarks and decaying into a pair of dark-matter particles, mediator masses below 50 GeV are excluded assuming a dark-matter candidate mass of 1 GeV and unitary couplings. For scalar and pseudoscalar mediators produced in association with bottom quarks, the search sets limits on the production cross- section of 300 times the predicted rate for mediators with masses between 10 and 50 GeV and assuming a dark-matter mass of 1 GeV and unitary coupling. Constraints on colour- charged scalar simplified models are also presented. Assuming a dark-matter particle mass of 35 GeV, mediator particles with mass below 1.1 TeV are excluded for couplings yielding a dark-matter relic density consistent with measurements