Tujuan penelitian ini adalah Menganalisis faktor-faktor yang mempengaruhi produksi bawang merah di Kecamatan Banggae Timur Kabupaten Majene Provinsi Sulawesi Barat, Penelitian ini menggunakan pendekatan kuantitatif (Quantitative approach) pada bulan Mei sampai Juli 2018. Dalam penelitian ini yang menjadi populasi adalah petani Bawang Merah yang ada di Kecamatan Banggae Timur, Kabupaten Majene Sulawesi Barat. Teknik pengambilan sampel dilakukan berdasarkan Simple Random sampling yaitu sebanyak 57 petani. Metode statistik yang digunakan untuk menguji hipotesis adalah dengan menggunakan regresi berganda dengan bantuan perangkat lunak SPSS for windows. Berdasarkan hasil analisis pengaruh luas lahan, jumlah tenaga kerja, jumlah pemakaian pupuk dan jumlah pemakaian pestisida terhadap produksi bawang merah adalah positif, artinya jika luas lahan ditambah maka akan meningkatkan produksi petani bawang merah, begitupula jika jumlah tenaga kerja, jumlah pemakaian pupuk dan jumlah pemakaian pestisida di tambah maka akan diikuti peningkatan produksi bawang merah.
The goal of this research is to synthesize and characterize Fe3O4@Chitosan-AgNP nanocomposites in order to determine their antibacterial activity. The research methods include the synthesis of Fe3O4@Chitosan-AgNP nanocomposites, as well as the characterization of nanoparticles using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) analysis, and subsequent antibacterial activity tests. The study’s findings demonstrated the successful synthesis of Fe3O4@Chitosan-AgNP nanocomposites, followed by nanoparticle characterization using SEM, TEM, XRD, and FTIR. Based on the XRD results, the conjugation of Fe3O4@Chitosan-AgNP nanocomposites has been successfully formed, as evidenced by the appearance of characteristic peaks of Fe3O4, chitosan, and AgNPs. According to the FTIR results, the interaction between chitosan-AgNPs and conjugated Fe3O4 occurred via the N atom in the NH2 group and the O atom in the OH group, and C=O. The SEM and TEM images also show that the Fe3O4@Chitosan-AgNP conjugation is a nanoparticle-based composite material. The combination of nanocomposites Fe3O4@Chitosan-AgNPs has antibacterial activity, inhibiting the growth of bacteria such as Bacillus cereus and Escherichia coli.
Many students are misconception, so the researchers do research with the aims to analyze the level of understanding of the participants’ concept students and the factors causing students’ misconceptions on the subject matter stoichiometry. Data collection uses open-ended diagnostic tests with a scale CRI with 18 numbers and interviews. The results showed the percentage of understanding concepts of 21% with a low percentage category, understand the concept but not sure at 7%, with the low category, the percentage of misconceptions of 12% with low categories and percentage do not understand the concept of 61% with a high category. Factors that cause misconception include a) students; c) how to teach.
ABSTRAKTelah dilakukan penelitian tentang pemanfaatan selulosa tongkol jagung pada pembuatan plastik biodegradable, untuk mengetahui pengaruh konsentrasi sorbitol terhadap sifat mekanik, biodegradabilitas dan ketahanan air. Penelitian ini dilakukan dalam beberapa tahap, yaitu preparasi bahan, pembuatan plastik dengan metode inversi fasa dengan variasi konsentasi plasticizer sorbitol, serta karakterisasi. Hasil penelitian menunjukkan bahwa penambahan plasticizer sorbitol 30% menghasilkan plastik biodegradable yang lebih baik karena memiliki ketahanan air maksimum yaitu 28,38% dan terdegradasi 90.24% dalam waktu 9 hari. Kuat tarik plastik tertinggi diperoleh pada penambahan plasticizer sorbitol 10% yaitu 2,7750 MPa dan elongasi terbaik diperoleh pada penambahan sorbitol 50% yaitu 16,94% . Hasil interpretasi gugus fungsi menggunakan spektrofotometer FTIR mengindikasikan adanya gugus OH pada bilangan gelombang 3417 cm-1, pada bilangan gelombang 2935 cm-1 menunjukkan adanya vibrasi CH2 yang merupakan kerangka pembangun struktur selulosa, gugus C-O nampak pada bilangan gelombang 1342 cm-1 dan 1209 cm-1 sedangkan gugus NH2 nampak pada bilangan gelombang 1641 cm-1. Berdasarkan data tersebut maka plastiik biodegradable tongkol jagung yang dihasilkan belum memenuhi SNI.Kata kunci: Plastik, Biodegradable, Sorbitol, Jagung dan Selulosa ABSTRACTA study has been conducted on the utilization of corncob cellulose on synthesis biodegradable plastic. This study aims to determine the effect of plasticizer addition to mechanical properties, biodegradability and water resistance, and to know the right type of plasticizer to produce biodegradable plastic that suits SNI. This research was conducted in several stages, namely material preparation, biodegradable plastic making with phase inversion method with variation of plasticizer concentration of sorbitol, and characterization of biodegradable plastic. The results showed that the addition of 30% of sorbitol produced better biodegradable plastic than because it has maximum water resistance of 28,38 % and degradation 90,24% within 9 days while the highest plastic tensile strength is 2.7750 MPa with concentration of sorbitol 10% and the best elongation of 16.94% concentration of sorbitol 50%. Based on the analysis of functional groups using FTIR spectrophotometer, it can be seen the absorption of the wave number at 3417 cm-1 which indicates the presence of the OH group, the wave number at 2935 cm-1 indicates the existence of vibrations CH2 which is the building framework of cellulose structure, the CO group is seen at wave numbers 1342 cm-1 and 1209 cm-1 whereas NH2 groups at wavelength 1641 cm-1. Based on these data biodegradable plastic corncob do not meet SNI.Keywords: Plastics, Biodegradable, Sorbitol, Corn and Selulose
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