21 research outputs found
IMPLEMENTASI MULTIMODAL LEARNING MELALUI PEMBELAJARAN KOOPERATIF TIPE GROUP INVESTIGATION BERBASIS WEB UNTUK MENINGKATKAN MOTIVASI DAN PRESTASI BELAJAR PESERTA DIDIK
No full textPenelitian ini bertujuan untuk mengetahui perbedaan: 1) motivasi belajar awal dan motivasi belajar akhir di kelas eksperimen; 2) motivasi belajar awal dan motivasi belajar akhir peserta didik di kelas kontrol; 3) motivasi belajar akhir peserta didik antara kelas eksperimen dan kelas kontrol; dan 4) prestasi belajar peserta didik antara kelas eksperimen dan kelas kontrol.
Populasi penelitian ini adalah peserta didik kelas XI IPA SMA Negeri 1 Purworejo tahun ajaran 2013/2014. Sampel diambil dengan cara purposive cluster sampling. Sampel terbagi menjadi dua yaitu kelas eksperimen dan kelas kontrol. Kelas eksperimen adalah kelas yang menerapkan multimodal learning kooperatif tipe group investigation berbasis web sedangkan kelas kontrol merupakan kelas yang menerapkan pembelajaran kooperatif tipe group investigation tanpa web. Insrumen yang digunakan dalam penelitian ini meliputi Rencana Pelaksanaan Pembelajaran (RPP), soal post-test, dan angket motivasi belajar kimia. Hipotesis penelitian diuji dengan paired samples t test, independent sample t test, dan univariate analysis of variance.
Hasil penelitian menunjukkan bahwa ada perbedaan motivasi belajar awal dan motivasi belajar akhir di kelas eksperimen, motivasi belajar akhir peserta didik antara kelas eksperimen dan kelas kontrol, serta prestasi belajar peserta didik antara kelas eksperimen dan kelas kontrol. Akan tetapi, hasil penelitian juga menunjukkan tidak ada perbedaan motivasi belajar awal dan motivasi belajar akhir di kelas kontrol
THE USE OF HYBRID MULTIMODAL LEARNING ON CHEMISTRY AT SENIOR HIGH SCHOOL TO IMPROVE STUDENTS’ MOTIVATION
No full textIntegration of delivery systems of learning such as model, method and media in teaching-learning in this research was called multimodal learning. This research investigated the effect of multimodal learning to students’ motivation. Multimodal learning in this research was cooperative learning delivered through hybrid, a combination between face-to-face and online using learning management system (LMS) Edmodo, and completed by some multimedia. Samples of this research were students of Grade XI-Science of SMAN 1 Purworejo in the academic year of 2013/2014. The samples were from two groups, experiment and control. Data of students’ motivation from both groups were collected using a questionnaire and analyzed using independent sample t-test to study the difference of students’ motivation between the groups, and using paired t-test to investigate the improvement of students’ motivation in each group. The results showed the improvement of students’ motivation from experiment group was higher significantly than that from control one (sig/ p = 0,000). The motivation of student from experiment group improved significantly due to multimodal learning (sif/p = 0,000), but that from control group did not improved significantly (0,054)
Pengaruh Metode Ekstraksi Maceration Vortex Technique Terhadap Aktivitas Antibakteri dari Daun Gedi (Abelmoschus manihot L.)
No full textAbelmoschus manihot L merupakan salah satu tanaman obat tradisional yang mengandung senyawa bioaktif seperti alkaloid, flavonoid, steroid, serta fenolik yang memiliki aktivitas biologis sebagai antibakteri, antioksidan, efek anti-inflamasi, efek antidiabetes, dan efek analgesik. Tujuan penelitian ini adalah untuk mengetahui pengaruh metode ekstraksi Maceration Vortex Technique terhadap uji aktivitas antibakteri. Metode Maceration Vortex Technique dilakukan dengan teknik maserasi selama 2 jam yang diikuti dengan vortex selama 5 menit. Ekstrak dari daun gedi dapat bersifat sebagai antibakteri terhadap Staphylococcus aureus dan Escherichia coli. Hasil uji aktivitas antibakteri diketahui memilki diameter zona hambat bakteri Staphylococcus aureus yang lebih besar dibandingkan dengan zona hambat pada bakteri Escherichia coli
Analisis In Vitro Aktivitas Antioksidan Ekstrak Aseton dari Ranting Horsfieldia macrothyrsa Menggunakan Beragam Metode: In Vitro Analysis of Antioxidant Activity of Horsfieldia macrothyrsa Twig Acetone Extract Using Various Methods
No full textHorsfieldia macrothyrsa (Miq) Warb. is a plant that contains secondary metabolite compounds that can act as antioxidants. This research aims to determine the antioxidant potential of the acetone extract of the H. macrothyrsa plant by looking at the IC50 value. Twigs of the H. macrothrysa plant were extracted using the maceration method using acetone solvent. The results of the antioxidant activity test using the DPPH (2,2-diphenyl-1-picrylhydrazyl) method showed very strong antioxidant activity with an IC50 value of 6.348 µg/ml whereas the IC50 value of the standard antioxidant quercetin is and quercetin 1.261 µg/ml. In antioxidant testing using the ABTS (2,2-azinobis (3-ethylbenzothiazoline-6-sulfonate) method, an IC50 value of 12,772 µg/ml was obtained and FRAP (Ferric Reducing Antioxidant Power) obtained an IC50 value of 7,511 µg/ml. Based on the results, it can be concluded that the acetone extract of H. macrothrysa plant twigs has very strong antioxidant activity towards reducing DPPH (2,2-diphenyl-1-picrylhydrazyl) compared to using the ABTS and FRAP methods
Isolation of Flavonoid Compounds and Anti-Cholesterol Test of Dutch Teak Leaf Extract (Guazuma ulmifolia Lamk.)
No full textDutch teak (Guazuma ulmifolia Lamk.) is a tree originating from Latin America (Brazil and Mexico). The results of the phytochemical test showed that Dutch teak leaves positively contained flavonoids, alkaloids (Dragendorff reagent), steroids, and saponins. The purpose of this study was to characterize the flavonoid compounds and test the anti-cholesterol properties of Dutch teak leaf extract. Flavonoid characterization methods used Mg-HCl (yellow), H2SO4 (reddish orange), NaOH (yellow), KKt-2A, UV-Vis, and FT-IR reagents. Anti-cholesterol test using the Lieberman-Burchard method. The flavonoid crystals obtained were in the form of amorphous crystals of 0.1047 grams. In KKt-2A there is a change in color from yellow to greenish yellow when viewed with a UV lamp. The UV-Vis spectrophotometer has an absorption wavelength of 326 nm. The results of FT-IR analysis showed the presence of functional groups: OH, CH, C=O, C=C, and COC. Based on these data it can be concluded that the isolated flavonoids are in the form of amorphous crystals which belong to the flavone class with the name 5,7,4' - Trihydroxyflavone-6-Prenyl. The results of the cholesterol reduction test stated that Dutch teak leaves could be anti-cholesterol as seen from the absorbance value being smaller and the percentage of anti-cholesterol activity being greater
DEVELOPMENT OF LECTORA INSPIRE ASSISTED LEARNING MEDIA TO IMPROVE STUDENTS' CRITICAL THINKING SKILLS
No full textAbstract
Researchers are concerned about the low level of critical thinking of students in Indonesia and its impact on current generations. Solve this issue, there is a need to develop innovative and interactive learning media using lectora inspire in order to meet the demands of 21st-century learning. This research used the 4D development model (Define, Design, Develop, and Dissemination) and involved grade V elementary school students in West Sumatera province. The developed learning media was assessed for feasibility through tests on media, content, language, and practicality. The results indicated that the interactive learning media assisted by lectora inspire effectively enhanced the critical thinking skills of elementary school students. Experts deemed the media feasible in terms of content, language, and usability. The implementation of lectora inspire-based learning media is seen as a creative and reflective solution to tackle the challenges of the 21st century
A Preliminary Screening of the Different of Secondary Metabolites Ruku-Ruku Leaves (Ocimum tenuiflorum Linnen) in West Sumatera
No full textRuku-ruku leaves are used to remove distinctive odors from fish in some cuisine of West Sumatra. The characteristic odor comes from secondary metabolites especially essential oils. Therefore, secondary metabolites in ruku-ruku leaves have the potential to be further investigated as a source of bioactive compounds. The phytochemical screening of ruku-ruku leaves is a preminilary qualitative test that needs to be done to maximise its function as a medicinal plant. Based on the result data, there are some different result of flavonoid, steroids, and triterpenoids identification. Ruku-ruku leaves from Pesisir Selatan and Padang Panjang shows less flavonoid compounds tham Payakumbuh, Batusangkar, and Lubuk Alung. Both of this city and Payakumbuh also gives less steroids and triterpenoids. The factor influencing this result is caused by several factors, namely temperature, humidity, light exposure, and salinity
Identification of Flavonoid Compounds in Ethanol Extract of Majapahit plant (Crescentia cujete) Leaves and their Potential as Anticancer
No full textThe Majapahit plant is commonly found in Indonesia but is rarely used due to a lack of information about its potential. One of the secondary metabolites commonly found in this plant are flavonoids. Therefore, this study aims to determine the distribution of flavonoid compounds in the Majapahit plant, particularly their potential as anticancer activty. Leaf material from Majapahit plants was extracted using the maceration technique, while the flavonoid compounds in the extract were identified using LCMS (Shimadzu LCMS-8040 LC/MS). The identification results showed that about 97 compounds were detected, including 14 flavonoids. The flavonoid compounds found include Quercetin, Chlorogenic acid, Kaempferol 3-O rhamnoside, Acacetin 7-rutinoside, Fortunellin, Kaempferol 3-[6”-(3-hydroxy-3-methyl glutarl) glucoside], Didymin, Diosmin, Hesperidin, Rutin, Citrusoside C, Citrusoside D, Narirutin 4'-glucoside, and Kaempferol 3-[6”-(3-hydroxy-3-methylglutaryl)glucoside] -7-glucoside. The highest composition of the identified flavonoid compounds was found in Kaempferol 3-O rhamnoside, with a 3.90
Two-dimensional mapping of needle visibility with linear and curved array for ultrasound-guided interventional procedure
No full textAnalysis of the Ethyl Acetate Fraction of Cumin Leaves (Plectranthus amboinicus) as an Antimicrobial against Staphylococcus aureus using LC-MS
No full textThe research investigates the antibacterial potential of cumin leaves due to their rich composition of flavonoid compounds, alkaloids, saponins, and tannins. The study's objectives encompass assessing the antibacterial efficacy of cumin leaf's ethyl acetate fraction against Staphylococcus aureus bacteria, identifying the concentration of this fraction yielding the most substantial inhibition zone, and characterizing the compound composition within the fractionated cumin leaf extract. Extraction involved maceration using 96% ethanol and fractionation through water, n-hexane, and ethyl acetate solvents. The ethyl acetate fraction's phytochemical screening affirmed the presence of flavonoids, alkaloids, saponins, and tannins. Liquid chromatography-mass spectrometer (LC-MS) analysis pinpointed the top two peaks as flavonoid compounds. Antibacterial assessments, executed via paper disc diffusion method, employed concentrations of 15%, 20%, and 25% of the ethyl acetate cumin leaf extract against Staphylococcus aureus, each repeated thrice. The 20% concentration exhibited the most substantial inhibition zone, averaging 23.1mm, compared to 16.8mm for 15% and 19.6mm for 25%, indicating its optimal efficacy against S. aureus growth. Statistical analysis employing ANOVA testing underscored the significance of the ethyl acetate cumin leaf fraction's concentration variations on S. aureus, as evidenced by a p-value of 0.00 (below the significance threshold of 0.05). This underscores the impact of the ethyl acetate cumin leaf fraction's concentrations on inhibiting S. aureus growth. The findings shed light on the potential of cumin leaves as a source of antimicrobial agents, with the 20% ethyl acetate fraction exhibiting notable effectiveness, opening avenues for further exploration and applications in antibacterial research.The research investigates the antibacterial potential of cumin leaves due to their rich composition of flavonoid compounds, alkaloids, saponins, and tannins. The study's objectives encompass assessing the antibacterial efficacy of cumin leaf's ethyl acetate fraction against Staphylococcus aureus bacteria, identifying the concentration of this fraction yielding the most substantial inhibition zone, and characterizing the compound composition within the fractionated cumin leaf extract. Extraction involved maceration using 96% ethanol and fractionation through water, n-hexane, and ethyl acetate solvents. The ethyl acetate fraction's phytochemical screening affirmed the presence of flavonoids, alkaloids, saponins, and tannins. Liquid chromatography-mass spectrometer (LC-MS) analysis pinpointed the top two peaks as flavonoid compounds. Antibacterial assessments, executed via paper disc diffusion method, employed concentrations of 15%, 20%, and 25% of the ethyl acetate cumin leaf extract against Staphylococcus aureus, each repeated thrice. The 20% concentration exhibited the most substantial inhibition zone, averaging 23.1mm, compared to 16.8mm for 15% and 19.6mm for 25%, indicating its optimal efficacy against S. aureus growth. Statistical analysis employing ANOVA testing underscored the significance of the ethyl acetate cumin leaf fraction's concentration variations on S. aureus, as evidenced by a p-value of 0.00 (below the significance threshold of 0.05). This underscores the impact of the ethyl acetate cumin leaf fraction's concentrations on inhibiting S. aureus growth. The findings shed light on the potential of cumin leaves as a source of antimicrobial agents, with the 20% ethyl acetate fraction exhibiting notable effectiveness, opening avenues for further exploration and applications in antibacterial research
