Judul: Studi Distribusi Benih Ikan Mas (Cyprinus carpio L) dari Petani Sampai dengan Pasar Ikan Cibaraja di Kecamatan Ciasaat, Kabupaten Sukabumi, Jawa Barat
Abstrak: Benih ikan mas ukuran individu 1-3 cm yang dihasilkan petani pembenih di Kecamatan Cisaat, 3,27 % ditanam kembali di sawah atau kolamnya, sedangkan 96,73 % dijual , yang distribusinya adalah 12,34 % dijual kepada tengkulak balong, 76,21 % dijual kepada tengkulak pasar dan 8,18 % dijual petani langsung kepada konsumen pemakai benih yang ada di Pasar Ikan Cibaraja. Yang diterima tengkulak balong sebesar 12,34 itu, disalurkan kepada tengkulak pasar yang beroperasi di Pasar Ikan Cibaraja sebesar 3,7 % dan dijual sendiri di pasar ikan tersebut sebesar 8,64 %.
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Judul: Analisis penawaran benih ikan mas di pasar ikan Cibaraja, kecamatan Cisaat, kabupaten Sukabumi
Abstrak: Pasar Ibn Cibaraja merupakan pusat pemasaran benih ikan di Kabupaten Sukabumi. Berbagai jenis ikan dalam berbagai ukuran ikan ditawarkan di Pasar Ikan Cibaraja, salah satunya benih Ikan Mas. Penawaran benih Ikan Mas teljadi sepanjang tahun dengan jumlah penawaran yang berfluktuatif Fluktuasi penawaran tersebut dipengaruhi berbagai faktor, seperti harga benih Ikan Mas (Pm(t», harga benih Ikan Mas satu bulan sebelumnya (Pm(t-I», harga benih Ikan Nila (pn), harga benih Ikan Sepat (ps), harga benih Ikan Lele (PI) dan penawaran benih Ikan Mas satu bulan sebelumnya (Qm(t-I». Penelitian kasus ini bertujuan untuk mengetahui faktor-faktor yang seeara signifikan mempengaruhi penawaran benih Ikan Mas ukuran 5-8 em di Pasar Ikan Cibaraja serta respon dari penawaran benih Ikan Mas terhadap perubahan dari faktorfaktor tersebut. HasiI penelitian menunjukan bahwa dari enam faktor yang diduga mempengaruhi penawaran benih Ikan Mas, hanya benih penawaran benih Ikan Mas satu bulan sebelumnya (Qm( t -1» yang seeara signifikan berpengaruh ter hadap penawaran benih Ikan Mas (Qmt). Respon penawaran benih lkan Mas terhadap harga benih lkan Mas (Pm(t», harga benih Ikan Mas satu bulan sebelumnya (pm(t-I», dan penawaran benih Ikan Mas satu bulan sebelumnya (Qm(t-I» bersifat inelastis. Dari niIai elastisitas silang diketahui bahwa benih Ikan Mas merniliki hubungan competW:'e product dengan benih Ikan Nila dan benih Ikan Sepat sedangkan dengan benih Ikan Lele memiliki hubugganjoint product.
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Judul: Glucose biosensor using a glucose dehydrogenase flavin adenine dinucleotide electrochemically immobilized on zeolite nanoparticles
Abstrak: A glucose biosensor was developed to measure blood glucose levels. The performance of these new glucose biosensors was continuously improved, producing better performance and stability. The technique selection and immobilization matrix are key factors for biosensor development, so that the prospecting of materials that can be used as a matrix for supporting enzyme, continue to be explore. The purpose of this study was to determine the activity and stability of the enzyme glucose dehydrogenase (GDH) that were immobilized on zeolite nanoparticles (NPZ) and determine the kinetic parameters and analytical performance by electrochemical methods. The resulting enzyme electrode with NPZ and enzyme electrode with zeolite A showed a high activity against the enzyme electrode glucose than without NPZ. The reaction kinetics of third electrodes of enzyme followed the Dixon equation. The 𝐼����𝑚����𝑎����𝑥����𝑎����𝑝����𝑝���� values for enzyme electrode without NPZ, with NPZ, and with zeolite A were 27.25 μA, 77.52 μA, and 48.54 μA, respectively. The 𝐾����𝑀����𝑎����𝑝����𝑝���� values for GDH enzyme that immobilized on the NPZ were 1.16 mM, 12.30 mM for GDH enzyme that immobilized on zeolite A and 0.95 mM for GDH enzyme immobilization without NPZ. The enzyme electrode without NPZ, with NPZ, and with zeolite A also showed a high sensitivity with value for the sensitivity were 0.58 μA mM-1, 0.81 μA mM-1, and 2.51 μA mM-1, respectively. The third enzyme electrodes showed different linear area with range for the enzyme electrode without NPZ, with NPZ and with zeolite A were 1.00-15.00 mM, 2.00-20.00 mM, and 0.06-10.00 mM, respectively. The blood glucose level of normal person ranged from 4 to 6 mM, so that the enzyme electrode with NPZ and without NPZ are suitable for use in the determination of the concentration of blood glucose. While the enzyme electrode with zeolite A has a smaller range so it is more suitable to use in the determination of glucose concentration in the foods or beverages. The enzyme electrode with NPZ and the enzyme electrode with zeolite A showed a good accuracy with relative error values were 3.84% and3.48%, respectively. Repeatability measurements also showed a good precission results with relative standard deviation values (%RSD) for the enzyme electrode with NPZ and enzyme electrode with zeolite A were 3.83% and 3.16%, respectively. By combining two immobilization techniques, physical adsorption on zeolite and entrapment on carbon paste, high enzymatic activity, good accuracy, and repeatability was attained. The enzyme electrode with NPZ and the enzyme electrode with zeolite A demonstrated a good electrochemical response toward glucose, allowing it to detect blood glucose levels and glucose levels in foods and beverages.
Keyword: glucose biosensor, immobilization, zeolite