Jurnal ILMU DASAR
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Phenolic Compounds Isolated from The Fern Chingia sakayensis (Zeiller) Holtt
Get PDFFour known phenolic compounds namely kaemferol, matteucinol, farrerol, and matteucinol-7-O-β-D-glucoside were isolated for the first time from the fern Chingia sakayensis (Zeiller) Holtt’s. All substances were separated by chromatographic techniques, purified by recrystalization, elucidated on the basis of spectroscopic evidence and by comparation with those reported data in literature. These results were very important to study the phytochemicals of the other fern in Chingia genus based on the chemotaxonomic approach
Combinatorial Technology as a New Method for Chemical Processes
Get PDFThe ultimate goal approach to combinatorial catalysis taken in this research is from an academic perspective where the main objective is to accelerate the discovery of catalytic phenomena, i.e. new catalytic materials and catalytic processes, constrained by limited equipment and human resources. A commercially synthesis robotic workstation is used for automated parallel preparation of catalyst libraries, which is able to reproduce a conventional catalyst preparation method used routinely in laboratory, thereby increasing significantly the number of catalysts that can be prepared at once. The aim of this work is to produce libraries of catalysts based on this type of system to be tested and optimized by using the high throughput screening reactors and the selected catalysts are characterized to understand the structural properties. The 12 parallel reactors allows a proper catalyst testing, under more realistic conditions than in conventional combinatorial techniques, especially when the catalyst stage is advanced and quantitative data is required
The Determination of Bedrock Depth Using Seismic Refraction Method in Kemuning Lor Village, Sub District of Arjasa, Jember
Get PDFA research has been done using seismic refraction method to determine the depth of bedrock in the Village of Kemuning Lor, sub district of Arjasa, Jember. The Data acquisition was done by using 12 geophones and using weight drop vibrations sources. The distance between the vibration source and the first geophone is 10 meters away, while the distance among geophones is 2 meter away each. This Data acquisitions used two tracks (the first track was about 90 meters and the second track was about 40 meters). The first and second track were crossing each other, the first track lied from the main road to crevasse, while the second track lied in line with the crevasse. The result was that we were able to obtain three layers having the depth of 3,03-6,76 m; 4,37-9,93 m and 10,68-13,32 m, and having spreading speed 168,9-198,8 m; 425,1-511,7 m and 909,1-972,2 m. The obtained bedrock profile had declivity toward the crevasse and is assumed to have the potential of soil movement
Geothermal Reservoir Analysis of Mount Rajabasa Kalianda Potency Area using Resistivity Method and Geothermometer
Get PDFA research has been done to determine geothermal reservoir boundaries of Mount Rajabasa by using 1D sounding and mapping resistivity method. The mapping acquisition data was done by means of  Schlumberger configuration for AB/2 = 150 m, AB/2 = 300 m, AB/2 = 450 m and AB/2 = 600 m, next the data was correlated with ID sounding data at 3–2 line and 3–4 line. Geothermal reservoir was found with depth ≤ 450 m with resistivity value is 35 m. The reservoir has been estimated as sandstone tuff which lay in Lampung formation. From 1D sounding correlated at line 3-2 and 3-4 are indicated existing fluid flowed at 20 m under suface. Geothermal reservoir of Mount Rajabasa has temperature 212.08oC and potency of energy is 12.5 MW/Km2. it classified as medium temperature
Identification of The Bactericide Active Fraction on Zingiber gramineum Blume Bark
Get PDFBactericide fraction as been isolated and identified from Zingiber gramineum Blume bark. The isolation carried out using partition by n-hexane, chloroform, and ethyl acetate eluent. The extract bactericide active (ethyl acetate extract) as been isolated using column chromatograpic method by benzene-chloroform (3:2) eluen system. The activity test of that isolate using Micrococcus luteus and Eschericia coli. The chemical structure of the compound was identified using gas chromatography-spectroscopy massa with Wiley 275.L library. The active fraction for E. coli contain hexadecanoic acid, ethyl ester; linoleic acid, ethyl ester; oleic acid, ethyl ester; and octadecanoic acid, ethyl ester. The active fraction for M. luteus contain octadecnoic acid; 9,12-octadecadienoic acid; octadec-9-enoic acid; and hexadioic acid, dioctyl ester
Characterization of Edamame Indigenous Rhizobia as a Candidate of Biofertilizer
Get PDFFive isolates, named R1, R3, R4, R6 and R7, were successfully isolated from leguminous edamame nodules, and characterized as indigenous rhizobia bacteria. All isolates were grown in a YEMA medium containing antibiotics ampicillin, streptomycin, rifampicin, tetracycline, chloramphenicol or penicillin. Cultivation revealed that R3 can grow in a medium containing all antibiotics, but not for R1 when they grow in a medium containing rifampicin. R7 could not grow when the medium contain streptomycin and rifampicin. Furthermore, R4 and R6 only grow at medium containing tetracycline. it seemed that R1 and R3 are more resistant against some antibiotics comparing with others. When YEMA containing bromthymol blue 1% medium was used, R1 produced the yellowish acid and R3 produced blue alkali. R1 also utilized dulcitol and Lhistidin as carbon and nitrogen source. R3 utilize the carbon source from dulcitol but cannot utilize the nitrogen source from L-histidin. Base on these results above, it can be suggested that R1 and R3 identified as Rhizobium leguminosarum and Bradyrhizobium japonicum
Generalized Reduced Gradient Optimization for Ammunition caliber 57 mm C-60 Het
Get PDFAmmunition is a tool that works to sabotage or destroy the target. Weapons Laboratory in TNI AL have ammunition caliber 57 mm C-60 Het, with more than 10 years of age. Ammunition caliber 57 mm C-60 Het has three sections, projectile, propellant, and primer. Primary part of this ammunition is not working well, so that it is necessary to repair this section. Repairing of primary part is done  by changing the chemical compound AB3, DF3, and GI2. The purpose of this study is to determine chemical composition of primary part, so that it can optimize the sensitivity and detonation. The results show that the optimization begins with model estimation of two response by Ordinary Least Square (OLS). Futher, model estimation for each response is tranformed into individual desirability function to form joint desirability function. Results optimization caliber ammunition 57 mm C-60 by Generalized Reduced Gradient method (GRG), obtained sensitivity of 9.93 cm and the detonation of 108.68 dB, with compotition AB3 compound was 48.8 grams, DF3 compound was 21.0025 grams, and GI2 compound was 17 grams.Â
Analysis of Sacharide Monomer and Functional Groups of Fe- Dietary Fiber Complex at Acid Condition Boiling
Get PDFThe aim of the study was to describe the changes of sacharide monomer and functional groups of Fe-dietary fiber complex at boiling with acidic medium. The research was designed as the Pre test-Post test Control Group, the treatment of variation pH (pH 3 and 7) and boiling time (raw and 35 minutes). The dependent variables were sacharide monomer of dietary fiber and functional groups of Fe-dietary fiber complex. FeSO4. 7 H2O was added as source of mineral Fe. The results of the study showed: 1) At pH 3-boiling time 35’ treatment, no changes to kinds of dietary fiber sacharide monomer, however changes of monomer content. 2) At pH 3-35’ treatment, the Fe binding both to lignin and cellulose at –OH groups, but it was not able to bind hemicellulose. At raw-pH 7, the Fe binding to lignin at –OH, -COOH groups; to cellulose at –OH, -CH2-O-CH2-, -COO groups; while to hemicellulose at –OH groups
Modified Newton Kantorovich Methods for Solving Microwave Inverse Scattering Problems
Get PDFThe Modified Newton-Kantorovich method (MNK) was formulated due to the limitation of The Newton-Kantorovich method (NK) in reconstructing the imitation of bone muscle and fat object. It was sensitive to contrast and cell size. In this research MNK and NK methods were applied to reconstruct the dielectric properties distribution of homogeneous and inhomogeneous objects from simulated scattered field dataset to know how the results of image reconstruction using both methods were. The results revealed that the MNK method was more flexible than the NK one.Â