Proceeding International Conference on Mathematic, Science, Technology, Education and their Applications
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Test the Power of drag Against the growth of bacteria of Staphylococcus aureus and Escherichia coli Extracts Ethanol Leaf Mangrove Rhizophora mucronata and the effects of Antidiabetik on Mice induced Aloksan
Full text linkThe purpose of this research is to know the component's bioaktif compound, the anti-microbial activity and the effect of antidiabetik from the leaves of the plant Rhizopora mucronata. The sample form of the leaves of the mangrove coastal area derived from Barru. Leaf Rhizopora mucronata is extracted by means of maceration using ethanol 96% for 3x24 hours. The extracts were then tested in phytochemicals, anti-microbial testing and test antidiabetik. Test results of Phytochemical Rhizopora mucronata leaf extract contains positive phenolic moieties. While based on the test results the test against bacteria antimicrobial i.e. Staphylococcus aureus and Escherichia coli, the Rhizopora mucronata leaf extract showed an absence of antimicrobial activity against different types of microbes are examined. While based on a test of ethanol extract of antidiabetik leaves the Rhizopora mucronata can lower blood glucose levels the mice experienced Hyperglycemia after induced by aloksan. The antidiabetik effect is shown by the awarding of the ethanol extract of R. mucronata doses of 625 mg/kgBB.Keywords: Rhizopora mucronata, phytochemicals, Staphyllococcus aureus, Eischerichia coli, antimicrobial, antidiabeti
Perception of 21st Century Learners to The E-Books as A Learning Resources
Full text linkThis present study was a survey research which has aims to know the perception of 21st century learners to the E-books as a learning literacy and resources. Subject of this research is a university students in Makassar, whose study in the university that manage by government. Sampling technique that researcher used in this study is a simple random sampling. The total of sample in this study is about 338 of university students. For the collecting data researcher used questionnaire that consist of 5 likert scale. Each item that used in this questionnaire had developed from 9 indicator about the criteria of learning media based on the software aspect, and each item also had been checked by expert and compute the data from expert by using IOC (Indexes of item-Objective Congruence) formula. Based on the IOC analysis there are 23 item that can be used as statement for questionnaire. Reliability analysis also used in this study, which the score of reliability is .869 that means alpha value is accepted. The result of this study also provide a different percentage for each item of questionnaire, this thing happen because every individual has a different experience in using of eBook as learning literacy. However, In this study show that respondent answer each item in positive feedback
The Group Of Understory Herbaceous Vegetation Stand At Tropical Lower Mountain Forest Of Mount Salak, West Java
Full text linkThis study aimed to determine the groups of herbaceous vegetation stands at tropical lower mountain forest of Mount Salak, Bogor, West Java. Hierarchical cluster analysis method was used for grouping herbaceous vegetation stands by Importance Value Index. The distance between stands was determined using Sørensen index while the grouping of stands made by the farthest distance method. The difference in stand's vegetation structure among the groups was tested with Kruskal-Wallis statistics. There were 4 stand groups (SG) formed at 80% distance of Sørensen index. The difference between SG was most visible through floristic composition. The most difference of SG was between SG 2 and SG 4, where the most dominant species that make up these SGs were Nephrolepis exaltata, Isachne globosa (family: Poaceae), and Etlingera megalocheilos (family: Zinggiberaceae) for SG 2 and E. megalocheilos, N. exaltata and Dinochloa scandens (family: Poaceae) for SG 4. Species N. exaltata, Scleria purpurascens (family: Cyperaceae), and Selaginella plana (family: Selaginellaceae) were found throughout the entire SG. There were no significant differences among the SG in the case of Shannon-Wiener’s Diversity Index, Pielou's Evenness Index, Simpson's dominance index and the number of species (P ≥ 0.05). There was a decreasing trend of vegetation structure's value from SG 2 to SG 1
Antibacterial Compounds Characterization in Chloroform Extract Leaves of Tahiayam Plant (Lantana Camara Liin.)
Full text linkThe research has been conducted to determine the compound has antibacterial activity in chloroform extract of leaves of Lantana camara Linn.. Using the screening, isolation by column chromatography fractionation method and the structure was determined by IR and NMR. The results showed that the chloroform extract has bacterial activity and isolated two compounds where are 22-β-dimethylakriloiloxy-3-oxoolean-12-ene-28-oic and pektolinarigenine flavonoid compounds. Both have the activity against E. coli and S. aureus.Keywords: antibacterial, L. camara. Linn., pektolinarigenin, Lantaden
THE EFFECT OF SUPERCRITICAL CO2 ON THE ANTIOXIDANT ACTIVITY OF THE SWIETENIA MAHAGONI SEED EXTRACT BY BOX-BEHNKEN DESIGN
Full text linkIn this study, the influence of supercritical carbon dioxide parameter on the antioxidant activity on Swietenia mahagoni seed extract was investigated. Response surface methodology was employed, using Box-Behnken statistical design to evaluate the effects of three independent variables. Pressure (20-30 MPa), temperature (40-60 oC) and particle size (0.25-0.75 mm) were the three variables with total time and CO2 flow rate being held constant at 180 minutes and 2 ml/min respectively, for each extraction. The extracts were screened for possible antioxidant activitiy by free radical scavenging activity 2,2-diphenyl-1-picryl hydrazyl (DPPH) assays. The study reveal that the highest antioxidant activity which was 94.84% was obtained at temperature of 40oC, pressure of 25 MPa and particle size of 0.25 mm. They stated that the dominan effect on the antioxidant activity of the Swietenia mahagoni seed extracts was the pressure campared to temperature and particle size
STUDENT’S PHYSICS ACHIEVEMENT THROUGH GASING PHYSICS LEARNING
Full text linkThis article describes physics achievement of students after they had learned physics through GASING physics learning. They were students who had low physics achievement score and did not like physics. Through GASING physics learning, they learned physics using simple digit and the physics equation was described by sketch. Their physics achievement of pretest were on low category and after they had learned through GASING they were on high score category. Student response of learning physics before learning by GASING was very difficult but after they had learned through GASING physics learning they thought more easy than before.Keywords: physics achievement, student’s response, GASING physics learnin
CRITICAL THINKING SKILL OF STUDENT THROUGH TOP DOWN APPROACH IN PHYSICS LEARNING
Full text linkThis article was a research which describes student’s critical thinking skills in learning physics through top down approach. In top down approach, student learned how to solve a challenge which was given by a teacher in classroom. To finish the challenge, student identified physical quantities which they need to solve it. After they had identified the quantities, they thought how to collect data then they conduct an experiment to find it. The experiment result was used to conclude the answer of the challenge. Learning by top down approach guided the student in thinking processes. They learn from the challenge and identify what they need to solve it. They learn how to analyze the data and conclude it as an evidence to answer the challenge. The test of critical thinking skills showed that the students were some proficiency where they able to identify data and information that counts as evidence but fault to thoroughly evaluate its credibility.Keywords: top down approach, critical thinking skills
The Implementation of Conceptual Change Approach to Teach Nature of Science and Cellular Respiration Concepts
Full text linkThe classroom action research aimed to investigate the way to implement the conceptual change approach in order to enhance students’ views of Nature of Science (NOS) as well as their understanding on cellular respiration concepts. The research question being investigated is How to implement the conceptual change approach to teach NOS and Cellular Respiration Concepts? The research participants are grade X science students (n=15) registered in English Program (EP) of a high school in Phitsanulok, Thailand. The teaching intervention had been conducted in three repetitive cycles of action research: planning, acting, observing, and reflecting, along with utilization of a series of instrument: the Nature of Science Questionnaire (NOSQ) and Cellular Respiration Questionnaire (CRQ), nine 55-minute lessons, semi-structured observations, and semi-structured interviews. The result of content analysis and triangulation advocated that the teaching intervention should consists of 5 phases of teaching, namely eliciting preconceptions, presenting common misconception, presenting targeted concepts, raising the status of targeted concepts, and reflecting on targeted concepts. The teaching necessarily gives equal attention to both NOS views and cellular respiration concepts, particularly the activities to raise the status of targeted concepts
Increase The Production and Quality of Biogas from Waste of Cattle Rumen Content Through The Addition of Molasses and Zeolite
Full text linkCurrently, The requirements of domestic energy must be directed to the diversification of energy sources other than petroleum. One of them is biogas. This research aim to determine the number and quality of biogas production from waste of cattles rumen content through the addition of molasses and zeolite. This study uses an anaerobic digester which comprised four treatments: control; waste of cattles rumen content with the addition of molasses (B); waste of cattles rumen content with the addition of zeolite (C); as well as waste of cattles rumen content with the addition of molasses and zeolite (D) on a laboratory scale with total volume of 5 liters and a retention time of 21 days. the volume of biogas formed is measured and tested the levels of methane gas using gas chromatography. in addition to the pH and temperature are also measured as the supporting data that support this research. based on results the average production of biogas in control digester for 21 days as much as 21.57 ml, while in the addition of molasses as much as 200 grams increase production with the average volume is 26, 5 ml. as for the concentration of methane gas, the addition of molasses can increase the concentration of methane. while the zeolite has a negative effect on the amount of biogas production. Zeolites absorb the gases contained in the digester, thereby reducing the volume of gas in the digester.Key word: biogas production, molasses, zeolites, waste of cattles rumen conten
The effectiveness of Scientific-Inquiry Learning Model to Improve Scientific Thinking Skills of Grade X student of High School in Gowa Regency
Full text linkThe purpose of this study is to test the effectiveness of book of Scientific - Inquiry (SI) learning model which has been developed by Jusniar (2015) with an average of 3.20 with a coefficient of expert judgment index equal to a valid category, the practicality of the perception of the average student 89.47% and the average teacher 90.05% who responded positively to the application of models and tools. This study was conducted at three schools with different characteristics SMAN 1 Bajeng (Accreditation), SMAN Bontonompo (Accreditation B) and SMAN WestBajeng (Accreditation B). The research design used is quasi experiment with pre-test and post-test control group design. The instrument used to collect data is 1) the observation sheet process of scientific thinking skills, 2) questionnaire user perception and 3) test the product of scientific thinking skills. The Results of effectiveness testing of the SI model viewed from two aspects: the enforceability of Scientific Inquiry learning through observation and testing processes Scientific Thinking Skills (KBI) products. Observation process includes the ability / skills to formulate the problem, observe, hypothesize, ask questions, collect data, discussion and conclusion) the experimental class for each to: SMAN 1 Bajeng average KBI groups with both category and 76.79% enough category 23 , 21%, SMAN 1 Bontonompo good category 73.21%, 23.22% and sufficiently less 3.57%. And for SMAN 1 west Bajeng good category 67.86%, 28.57% and lacking sufficient at 3.57%. The effectiveness of the learning model Scientific-inquiry of the test results ANACOVA with SPSS for windows 20.0 was obtained respectively: 1) SMAN 1 Bajeng significance of the implementation of the model 0000 with a contribution of 26.2% against the influence of SI models KBI students; 2) SMAN 1 Bontonompo significance of the implementation of the model 0000 with a contribution of 44.9% influence model (SI) to KBI students; 3) SMAN 1 WestBajeng significance of the application of the model 0000 with a contribution of 24.0% influence on the KBI student models; meaning of the three schools that made the object to the implementation of the model and the device is considered effective to increase the KBI high school students on test material electrolyte and non-electrolyte solution.Keywords: Scientific Thinking Skills, Scientific-Inquiry Learning Mode