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2021 The mineralogic and isotopic fingerprint of equatorial carbonates: Kepulauan Seribu, Indonesia Dwi Amanda Utami,Sri Yudawati Cahyarini, Lars Reuning, Maximillian Hallenberger Kepulauan Seribu is an isolated patch reef complex situated in the Java Sea (Indonesia) and is a typical example for a humid, equatorial carbonate system. We investigate the mineralogical and isotopic fingerprint of Panggang, one of the reef platforms of Kepulauan Seribu, to evaluate differences to other carbonate systems, using isotope in combination with XRD and SEM analysis. A characteristic property of shallow water ( Lihat
2021 KTI Jurnal Bereputasi Tinggi - Determining the origin of volcanic rocks in the mélange complex of Karangsambung based on the electrical resistivity imaging Ilham Arisbaya,Muhammad Ma'ruf Mukti,Yayat Sudrajat,Lina Handayani An ENE-WSW-trending localized basalt-diabase outcrop along the SE margin of Luk Ulo Mélange Complex has been suggested as intrusive rocks cut through the Paleo- gene Totogan and Karangsambung formations. However, the absolute dating of the volcanics is older than the inferred relative age of the sedimentary formations, hence the in-situ intrusion theory is less likely. A subsurface imaging should delineate the possibility of the in-situ nature of volcanic rock by looking at the continuation of the rocks to the depth. In this study, we did a subsurface imaging by electrical resistivity method. The electrical resistivity surveys were conducted at 3… Lihat
2021 Artocarpanone isolated from Artocarpus heterophyllus heartwoods enhances cytotoxic effect of cisplatin against H460 and MCF-7 cell lines Artocarpus heterophyllus has been used as a folk medicine in Asian countries. Flavonoid possessed a wide-range of therapeutic compoundsfor the treatment of several diseases including cancer prevention. Artocarponanone is s flavonoid isolated from the heartwoods of A. heterophyllus. This study was undertaken to investigate the interaction of natural compound and commercial anticancer, cisplatin against two cancer cell lines. MTT assay was performed to determine the cytotoxic effect of the combination. Isobologram analysis was used to predict the interaction of combination against cancer cell lines. The effect of this combination was then confirmed using AO/PI staining method. It showed that artocarpanone… Lihat
2021 Lake Poso's shrimp fauna revisited: the description of five new species of the genus Caridina (Crustacea, Decapoda, Atyidae) more than doubles the number of endemic lacustrine species Werner Klotz, Thomas von Rintelen, Chris Lukhaup, Kristina von Rintelen Lake Poso, an ancient lake system on the Indonesian island Sulawesi, harbours an endemic species flock of six, four lacustrine and two riverine species of the freshwater shrimp genus Caridina. In this study, five new lacustrine species are described, bringing the total to eleven species altogether. The number of lacustrine species is more than doubled to nine species compared to the last taxonomic revision in 2009. One of them, Caridina mayamareenae Klotz, Wowor & von Rintelen, sp. nov., even represents the first case of an atyid shrimp associated with freshwater snails which is morphologically adapted to living in shells. An… Lihat
2021 The evolution and genetics of sexually dimorphic ‘dual’ mimicry in the butterfly Elymnias hypermnestra Dee M. Ruttenberg, Nicholas W. VanKuren, Sumitha Nallu, Shen-Horn Yen, David J. Lohman & Marcus R. Kronforst Sexual dimorphism is a major component of morphological variation across the tree of life, but the mechanisms underlying phenotypic differences between sexes of a single species are poorly understood. We examined the population genomics and biogeography of the common palmfly Elymnias hypermnestra, a dual mimic in which female wing colour patterns are either dark brown (melanic) or bright orange, mimicking toxic Euploea and Danaus species, respectively. As males always have a melanic wing colour pattern, this makes E. hypermnestra a fascinating model organism in which populations vary in sexual dimorphism. Population structure analysis revealed that therewere three genetically distinct E.… Lihat
2021 Cost optimization of tannery wastewater treatment by electrocoagulation process with iron electrode under various DC voltage and electricity consumption Ajeng Arum Sari,Widyarani,Elan Sutarlan,Naufal Fasa, E.B. Nursanto Electrocoagulation (EC) is an electrochemical technique in wastewater treatment that generates coagulant species in situ by electro dissolution of the sacrificial electrode. This work aimed to optimize the operating cost of tannery wastewater treatment by EC with iron electrodes under various DC voltages and electricity consumption. The experiment was conducted in a 400 mL batch electrochemical reactor using three iron electrode plates under a mono polar configuration and parallel distances of 26 mm. Several variations of voltage (8; 12; and 16 volt) and electricity consumption (1.7; 2.6; 3.4; and 4.3 kWh/m3) were applied. The reactor performance was evaluated based on… Lihat
2021 Microstructure and oxidation behavior of an Al–Ni–Cr–Cu–MoO3–SiO2 composite coating on low-carbon steel Agus Sukarto Wismogroho,Wahyu Bambang Widayatno,Abdul Basyir,Nono Darsono,Satrio Herbirowo,Nurul Taufiqu Rochman,Didik Aryanto,Hariyati, Pulung Karo Karo, Alfian Noviyanto In the present study, an Al–Ni–Cr–Cu–MoO3–SiO2 composite coating with varying elemental compositions was deposited using the mechanical alloying technique. The composite coating structure before and after an oxidation test was studied using X-ray diffraction (XRD), three-dimensional optical microscopy, scanning electron microscopy (SEM), and energy-dispersive X-ray spectroscopy (EDX). A cyclic oxidation test was conducted in an 800 °C air atmosphere for 10 cycles (200 h). Based on the XRD, SEM, and EDX analyses, the coating comprised composite-refined Al, Ni, Cr, and Cu particles as well as coarse SiO2 particles. The composite coating had a thickness in the range of 36–59 μm,… Lihat
2021 Persistence of Carbaryl Pesticide in Environment Using System Dynamics Model Carbaryl, one of the carbamate insecticides are used extensively for pest control in agriculture. The chemical is highly valued for its rapid action and relatively short environmental persistence. Because of its widespread and intensive use, residues of carbaryl have the potential to contaminate the environment. This study aims to formulate a system dynamics model to simulate a degradation process of carbaryl. Since carbaryl was not readily volatilizing, this study only estimates the concentration and degradation of carbaryl in soil and water. The result revealed that carbaryl degraded rapidly, with a half-life of 7 days in soil and two days in… Lihat
2021 Nutrient Composition of Fermented Coffee Husk and its Potency as Sunda Porcupine Feed in Captivity Didid Diapari Several studies have been published that coffee husk was feasible used as animal feed. But, coffee husk also has anti nutritional content that diminish acceptability and palatability. One of methods that effectively reduce anti nutritional is biofermentation. The aim of this study was to determine the effect of fermentation of coffee husk on nutrient composition as Sunda porcupine feed. The coffee husk was fermented with Aspergillus niger. Then, twelve Sunda porcupine were used and fed with control ration (T0), control with 10% fermented coffee husk (T1), control with 20% fermented coffee husk (T2), and control with 30% fermented coffee husk… Lihat
2021 The effect of addition alpha tocopherol antioxidant on slow freezing medium to the quality of Garut sheep oocyte (Ovis aries) Ekayanti M Kaiin, EN Salmah, M. Gunawan, L Sjahfirdi This study has evaluated the ability of alpha tocopherol antioxidant in maintaining the quality of Garut sheep oocytes post-cryopreservation using slow freezing method. Total of 226 oocytes with two different qualities (A and B) are matured in vitro in TCM-199 medium added with 150 μM alpha tocopherol. Afterwards, the oocytes were cryopreserved in the slow freezing medium with the addition of 0 μM (KK), 100 μM (KP1), 150 μM (KP2) and 200 μM (KP3) alpha tocopherol. Combination of cryoprotectant 10 % ethylene glycol (EG) and 0.1 M sucrose were also added to the medium slow freezing. Oocyte evaluation was carried… Lihat