Application of STAD Type Cooperative Learning Models Integrated With Camtasia Studio Presentation Media on Student's Motivation and Learning Outcomes Class XI MIPA SMAN 1 Sigi Biromaru

This research aims to determine the effect of student motivation and outcomes learning through the application of cooperative learning model type of STAD combined with presentation media camtasia studio in class XI MIPA at SMAN 1 Sigi Biromaru. Subject of this research was two classes of XI MIPA1 as much 22 students as the experimental class and XI MIPA2 as much 22 students as a control class determined by Purposive Random Sampling. Data was collected use questionnaire instrument of learning motivation and learning result test. Testing data of research result using t-statistical analysis of t-test (Independent Sample t-Test) with prerequisite test that is normality test and homogeneity test. The average score of students learning motivation in the experimental class was 81 and the average score of students learning motivation in the control class was 67. The average score of students learning outcomes in the experimental class was 85 and the average score of students learning outcomes in the control class was 74. Based on the hypothesis analysis with t-test motivation of learning motivation obtained value tcount = 7.670 and it was located in the region of rejection of H0 between -2.018 and 2.018. Hypothesis analysis with t-test result statistic obtained value tcount = 8.056 and it was located in the region of rejection of H0 between -2,018 and 2.018. The result shows that there is effect of application cooperative learning model type of STAD combined with media presentation of studio camtasia toward the student motivation and outcomes learning in class XI MIPA at SMAN 1 Sigi Biromaru

Analisis Kadar Kalium (K) Dan Kalsium (Ca) Dalam Kulit Dan Daging Buah Terung Kopek Ungu (Solanum melongena) Asal Desa Nupa Bomba Kecamatan Tanantovea Kabupaten Donggala

This study aims to determine the levels of potassium (K) and calcium (Ca) in the rind and flesh of the kopek purple eggplant (solanum melongena) fruit. Determination of mineral level was done by destruction of the sample using stong acids, which were nitric acid (HNO3) and perchloric acid (HClO4). The method used in this study was a laboratory experiment using a flame photometry. The results showed that the levels of potassium in the flesh of kopek purple eggplant farmers I and II were 215 ± 7,07 mg/100 g and 195 ± 14,14 mg/100 g, respectively; while the rind of kopek purple eggplant farmers I and II were 142,5 ± 3.53 mg/100 g and 102.50 ± 3.53 mg/100 g, respectively. The levels of calcium in the flesh of kopek purple eggplant farmers I and II were 10 ± 7.07 mg/100g and 15 ± 3.53 mg/100 g, respectively; while the rind of the kopek purple eggplant farmers I and II were 6.25 ± 1.76 mg/100 g and 7.50 ± 3.53 mg/100 g, respectively

Uji Aktivitas Ektrak Daun Palado (Agave angustifolia) Sebagai Antioksidan

Study on the antioxidant activity test has been conducted using palado (agave angustifolia) leaves from Tondo, Central Sulawesi. Palado plant is one of the succulent plants that can grow to a large size, and it is possible to contain antioxidant compounds. This study was conducted by an experimental method using maceration extraction technique and 1,1-difenil-2-picrylhydrazyl (DPPH) as the free radicals source, and vitamin C as the positive control, whereas UV-Vis spectrophotometer as for determining wavelength (λ) of palado leaves extracts. Sample used as much as 5 grams palado leaves, and methanol as the solvent. Variation concentrations of palado leaves extract were 20, 40, 60, 80, 100, 120, and 140 ppm. The results showed that the IC50 value of palado leaves extract was 26.182 ppm. Palado leaves extract is classified as a very powerful antioxidant based on the IC50 value. The optimum percentage antioxidant activity of palado leaves extract in inhibiting free radicals was by 84.84%

Analisis Vitamin C dan Protein pada Biji Buah Labu Siam (Sechium edule)

Chayote seeds are found in the middle of the fruit which have flat structures and white. Those seeds has never been used. This study aimed to determine the levels of vitamin C and protein in old chayote fruit seeds. The vitamin C were analyzed using a UV-Vis spectrophotometer, while the protein were analyzed using the Kjeldahl method. Results showed that level of the vitamin C in old fruit seeds was by 0.56%, while the protein level obtained was by 0.81%. This study concluded that old chayote fruit seeds contained protein and vitamin C that can be used as a source of antioxidants and source of beneficial nutrition

Efektifitas Biji Kelor (Moringa oleifera Lamk) Sebagai Koagulan Besi (Fe) Dan Kalsium (Ca)

Research about coagulation of iron and calcium have been conducted using moringa (moringa oleifera Lamk) seed coagulant through the variation of the concentration of moringa seed and depositional time. Moringa seeds were used in this research that moringa seeds are old and dry. Compounds of moringa seeds that play role in the coagulation process of iron and calcium are proteins. This research was conducted to determine the optimum concentration of moringa seed and optimum deposition time on the process of coagulation using moringa seed coagulant in order to obtain the percentage decrease in the levels of iron and calcium. Variations in the concentration of moringa seeds were used in this research are 100, 200, 300, 400 and 500 ppm and the settling time is 30, 60, 90, 120 and 150 minutes. The results showed that the concentration of moringa seed and deposition time influenced in the process of coagulation of iron and calcium. In iron coagulation, obtained optimum concentration of 400 ppm moringa seeds and optimum settling time is 90 minutes. In these conditions the iron content decreased by 68.00 ppm or 66.95% from its initial level of 99.8 ppm. While the calcium coagulation, moringa seeds obtained optimum concentration of 500 ppm and optimum settling time of 120 minutes, which in this condition calcium levels decreased by 241 ppm or 49.00% of the initial concentration is 492 ppm

Pengaruh Konsentrasi Ragi Tape (Saccharomyces Cerevisiae) terhadap Kadar Bioetanol Pada Proses Fermentasi Biji Alpukat (Persea Americana Mill)

Avocado seed contains high level of starch and it can be used as one of the raw materials for bioethanol. This study aimed to determine the influence of variation concentration of tape starter toward bioethanol level in the fermentation process of avocado (persea americana Mill.) seed. Some process on this research were delignification with 4% NaOH, hydrolysis with 12% HCl, and fermentation with various concentrations of yeast tape (saccharomyces cerevisiae) ie 10%, 20% and 30% of substrate volume for 5 days. Bioethanol level was determined by using alcoholmeter. The highest bioethanol level was obtained in the addition of yeast tape as much as 30% of substrate that was an equal to 32.65% with density of 1.0029 g/mL

Uji Aktivitas Antioksidan Ekstrak Daun Salam (Syzygium Polyanthum) Dengan Menggunanakan 1,1-Difenil-2-Pikrilhidrazil

Antioxidant activity test of bay leave (Syzygium polyanthum) extract using 1,1-diphenyl-2-picrylhidrazyl (DPPH) has been investigated. The aim of this research is to determine antioxidant strength of bay leave (Syzygium polyanthum) extract. The bay leaves used in this research were young, medium, and old leaves categories. Concentration of DPPH free radical after additional bay leave extracts were determined by UV-Vis spectrophotometry. Variation concentrations of bay leave extracts were 20 ppm, 40 ppm, 60 ppm, and 80 ppm. Vitamin C solution was used as the positive control at the similar concentration, while DPPH solution in ethanol absolute was the negative control. The results showed that IC50 values for young, middle, and old leaves extracts were 37.441 ppm, 14.889 ppm, and 11.001 ppm, whereas vitamin C was 9.898 ppm. Based on these IC50 values, vitamin C is the strongest antioxidant than young, middle, and old bay leave extracts, and these extracts are classified as very strong natural antioxidant

Analisis Kadar Karbohidrat, Lemak Dan Protein Dari Tepung Biji Mangga (Mangifera indica L) Jenis Gadung

Mango (Mangifera indica L) seeds never to used, so they need efforts to be as food ingredients such as flour. Gadung mango seed was one type of mango seeds used as flour. This study aims to determine the nutrient content i.e. carbohydrates, fats, and proteins of Gadung mango seed flour produced through sulfurization and without sulfurization. Sodiumbisulfite (NaHSO3) with a concentration of 730 ppm was used for mango seed soak for 4 hours at sulfurization stage. The results showed that the Gadung mango seed flour through sulfurization had levels of 13.89% carbohydrate, 12.94% fat and 8.48% protein, while the mango seed flour without sulfurization had levels of 20% carbohydrate, 14.83% fat, and 4.84% protein. The technique of sulfurization on making mango seed flour can reduce levels of carbohydrates and fats as well as maintaining the protein content

Analisis Kalor Dan Sintesis Bioetanol Dari Serabut Kelapa Sawit Sebagai Alternatif Bahan Bakar Terbarukan

Palm fibers are solid waste from the palm oil processing plant. Palm fibers can be used as an alternative fuels for traditional and modern (bioethanol). This study aims to determine the amount of heat generated from the burning of palm fibers, and determine the number of conversions of bioethanol from palm fibers through the fermentation techniques. In this study used a bomb calorimeter is determine heat value and apply through fermentation using saccharomyces cereviseae in various times of 5 and 11 days to synthesis ethanol. The step in this study were sample preparation, delignification, hydrolysis with acid variation, and fermentation. Determination of bioethanol content from the fermentation was analysed using ethanol sensor. The heat value of palm fibers is equal to 4708.21 cal/g and the highest ethanol fermented product obtained on days 11, ie 5.23%. It can be concluded that palm fibers can be used potentially as an alternative renewable fuels to substitute coal or diesel power

Pengaruh Kombinasi dan Rasio Pelarut Terhadap Hasil Ekstraksi Minyak dari Serabut Kelapa Sawit

This study aimed to determine the combinations and ratios of appropriate solvents to obtain the optimal mass of palm oil. Extracting the oil from palm fibers was conducted using soxletation method. Extraction is a way to get oil in a high amount and good quality by using an appropriate solvent. The weight of oils obtained from the volume ratios variable of solvents at 100:0, 70:30, 50:50, 30:70, and 0:100 were 0.446 ± 0.063 g, 0.379 ± 0.022 g, 0.295 ± 0.012 g, 0.276 ± 0.045 g, and 0.183 ± 0.054 g, respectively. This study showed the combination of the types and ratios of solvents toward extraction of oil, and the optimal oil mass was produced from n-hexane solvent