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INDONESIA
PROSIDING SEMINAR KIMIA
Published by Universitas Mulawarman
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Core Subject : Science,
Chemistry
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Articles 50 Documents
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Search results for , issue "PROCEEDING OF INTERNATIONAL CONFERENCE 2015" : 50 Documents clear
ANALYSIS OF CHROMIUM (Cr) HEAVY METAL CONTENT IN TILAPIA (Oreochromis niloticus) FROM EX-COAL MINE AREA IN THE KERTA BUANA VILLAGE TENGGARONG SEBERANG Maasje Catherine Watulingas
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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There has conducted research to determine the metal content of chromium (Cr) in tilapia (Oreochromis niloticus). This study was conducted to determine the metal content of chromium in the nila fish with different sizes of fish weight, history of sampling sites (lakes former coal mine) and laboratory activities aimed to determine levels of heavy metals chromium in tilapia. Determination of heavy metals using atomic absorption spectrophotometry. The results showed that levels of Chromium on tilapia in the lake ex-coal mine has the standard quality. Based on ISO 7387: 2009, the levels of Chromium on tilapia is not suitable for consumption and based on the levels of heavy metals were analyzed in a variety of sizes do not have the weight that make significant differences.
PROFILE OF STUDENT’S MISCONCEPTIONS TOWARDS LEARNING SCIENCE Wike Kusuma Wardani; Ummu Kulsum
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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Students' understanding of science can lead to misconceptions. This study aimed to describe profile of student’s misconceptions towards learning science. Based on data ofstudents misconceptions on learning science, will be formulated students learning process. The participants of this research were students of class VII A in Public Junior High School 5 Surabaya. Student’s misconceptions were determinedbased on the results of understanding on learning science tests that was designed in the form of CRI (Centainty of Response Index). Verification of high intensity misconceptions was done by identifying misconceptions in groups. Data for identification of misconceptions in the group was based on the average value of CRI of respondents who answered correctly (CRIB), respondents who answered incorrectly (CRIS), and the fraction of respondents who answered correctly (Fb). The results of this study were (1) 16 items from 26 (61.5%) was misconceptions, and (2) misconceptions students with high intensity occurred in the concept of the use of reasoning, experimentation, the nature of scientific ideas, scientific ideas democratically, the task of scientists, nature scientists, science is a boring science, the ability of students to learn science, and the students' understanding of the philosophy of science.
THE DIFFERENCE BETWEEN INQUIRY AND DIRECT LEARNING MODEL USING DRILL METHOD TOWARDS STUDENTS LEARNING ACHIEVEMENT IN CHEMISTRY BY OBSERVING MEMORIZING SKILL IN STUDENTS OF CLASS XI ON RATE OF REACTION TOPIC IN SMK NEGERI 17 SAMARINDA Nurlaili -; Galuh Hayu Widyaningrum
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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This study aims to find out: (1) the difference of implementation of inquiry and direct learning model using drill method towards learning achievement in chemistry on rate of reaction topic in SMK Negeri 17 Samarinda, (2) the difference between students who have high memorizing skill in class which utilizes inquiry learning model and class which utilizes direct learning through drill method and students who have low memorizing skill in class which uses inquiry learning model and class which uses direct learning through drill method towards learning achievement on rate of reaction topic in SMK Negeri 17 Samarinda. The population in this research is all students of class XI Pharmacy in SMK Negeri 17 Samarinda, while the samples being taken is class XI Pharmacy 2 and XI Pharmacy 3, each has 25 students. XI Pharmacy 2 is the class that uses inquiry learning model while XI Pharmacy 3 implements direct learning through drill method. Data collecting technique being used in this research is the test technique. The result is then analyzed by using t-test. From the result, it can be concluded that: (1) there is no difference between the implementation of inquiry and direct learning through drill metthod towards learning achievement on rate of reaction topic in SMK Negeri 17 Samarinda, (2) there is difference in learning achievement between students who have high memorizing skill in class using inquiry learning model with class using direct learning through drill method and there is no difference in learning achievement between students who have low memorizing skill in class using inquiry learning model with class using direct learning through drill method.
DIVERSITY OF SECONDARY METABOLIT OF ARTOCARPUS ALTILIS Erwin -
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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Artocarpus altilis (Synonyms: Artocarpus communis and Artocarpus incisus.) Is a fast growing plant and spread it evenly in tropical and sub-tropical forests. In many countries, this plant is known as a traditional medicine such as in Taiwan is used as a remedy swelling of the liver, is anti-inflammatory, and has a detoxifying effect (detoxifyng), while in Indonesia, the leaves is using as an external medicine and to treat swelling of lymph. From various reports the results showed A. altilis contain steroids, chalcone, stilbene, flavonone, flavanone, aurone, and quinonoxanthone. Among the compounds which are found potentially as a hypo-allergenic and anti-tumor drug, tyrosinase and α-glucosidase inhibitory activities, and cathepsin inhibition.
LEARNING STYLES RELATIONSHIP TO VALUE GPA CHEMISTRY EDUCATION STUDENTS MULAWARMAN Abdul Majid
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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The student's learning style is typical of the way a person in performing activities of learning, where learning style is one factor that can affect student cumulative grade point. Therefore, research on "Learning Styles Relationship To Value GPA Chemistry Education Students Mulawarman". This study was aimed to investigate the relationship between the student learning styles of cumulative grade point Mulawarman Chemical Education.The method was used in this research is the descriptive analytic. The samples were Mulawarman chemistry education students cluster random selected as many as 127 students. The data collection was performed by two methods: the questionnaires and interviews.The results of the study were analyzed using product moment correlation test with significance level of 0.05 were performed with SPSS. Which was obtained r = 0.231 (low correlation), thit = 2.81185 and ttab=1.65714 so thit>ttab. Hα means that Ho is rejected and accepted, that there is a significant correlation between learning styles on the value of the
THE EFFECTIVENESS OF LIPASE IMMOBILIZATION ON CHITOSAN BEADS CROSS-LINKED BY GLUTARALDEHYDE Lizma Febrina
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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The effectiveness of immobilized lipase on chitosan bead with glutaraldehyde as cross-linker compounds has been carried out. This research aims to obtain optimal condition for immobilization of lipase on chitosan bead. Chitosan bead made from chitosan powder by inverse phase method. This research started from the optimization process of immobilization for the optimum concentration of glutaraldehyde as cross-linker compounds. Immobilized lipase on chitosan beads was tested for its activities and stability of re-uses in the hydrolysis reaction of palm oil triglycerides. The optimum concentration of glutaraldehyde is 0,5% (v/v) with immobilization enzyme percentage 84% and specific activities of immobilized of lipase 82 U/g. Immobilized lipase has lower activities than free lipase. But it have the relative activity of 70% after 5 times of use, while the free lipase enzymes 4% after 5 times of use. This indicates the stability of the re-use of lipase immobilized better than free lipase.
THE USE OF MULTIMEDIA FOR FACILITATING LEARNING STYLE DIFFERENCES IN BALANCING REDOX REACTIONS Sukarmin -
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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This study aims to determine, the distribution of students' learning styles, student responses to multimedia, and the improvement of learning outcomes after using multimedia. By using instruments The Kolb Learning Styles Inventory was found that from 15 students in the research class is divided into 20% diverger, assimilator 13.3%, 20% converger, and 46.7% accomodator. The results of this research showed that students with diverger, assimilator, diverger, and converger learning styles gave a positive response. Multimedia is suitable to be applied to the student's learning style diverger, assimilator, diverger, and converger with high learning outcomes improvement.
STRUCTURAL ELUCIDATION OF SECONDARY METABOLITES IN SPONGE (Callyspongia pseudoreticulata) WITH N-HEXANE EXTRACT M. Nurdin; Hanapi Usman; Ambo Ala; Baharuddin -
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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Sponge is one of marine that have high bioactivity and contain secondary metabobolite compaund which can be used as antibiotic and medicine. Terpenoid compound derivatives have been successfully isolated from sponge Callyspongia pseudoretilulata by a a method in which the n-hexane extract weighting 11.28 g was fractionated using vacuum column chromatography with a non-polar eluent, n-hexane. The polarity of this eluent was improved by ethyl acetic resulting in fairly polar eluent, methanol. Total 27 fractions were obtained and one of the compounds from n-hexane extract was structurally elucidated by NMR spectroscopy and two dimensions of homonuclear and heteronuclear (1H, 13C, DEPT, H-H COSY, HMQC, and HMBC). The identified compound was a hydrocarbon (1-ethyl cyclo hex cosana-1-amin) thatindicated LC50 of 60.58 against A. salina and has a great potential as antitumor or anticancer.
THE INFLUENCE OF HYDROCHLORIC ACID (HCl) ACTIVATOR CONCENTRATION TO ADSORPTION CAPACITY OF CHARCOAL ACTIVE OF DURIAN’S PEEL (DURIO ZIBETHINUS) TO SUBSTANCE COLOUR OF METHANIL YELLOW Sitti Chadijah; Supiati -
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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Durian’s peel is a waste which usually burned, stacked or disintegrated and can make pollution to the environment. This condition motivates the researcher to produce the value-added product from the durian’s peel, such as activated carbon and as well as it can solve the environmental problems. This research aims to know the influence to use variation of concentration of activator HClwhice produces the optimum adsorption capacity from charcoal active of durian’s peel to the substance color of methanil yellow. Active carbon which is used in this research comes from durian’s peel which granular types with standard -100+40 mesh. Carbon is activated by physics in furnace with 400°C heat during 2 hours and is activated by chemistry with submerged of HCI 1M, 2M, 3M, 4M and 5M during 24 hours. The result of this research shows that optimum concentration in HCI 1M with adsorption capacity from charcoal active of durian’s peel is as large as 0,5350 mg/g. Whereas knowing the influence of activator is used tabulation method by statistically, where we can get FHitung 0,004 is smaller from FTabel 10,127. It explains that H0 is accepted to reject H1. Therefore, it can conclude that there is not significant influence to use variation of concentration of activator HCl to adsorption capacity of charcoal active from durian’s peel in substance methanil yellow.
MICROALGAE AS GREEN ENERGY SOURCES AND THEIR HIGH VALUE CO PRODUCTS Indah Raya
PROSIDING SEMINAR KIMIA PROCEEDING OF INTERNATIONAL CONFERENCE 2015
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Energy and microalgae

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