Judul: Study of Sumatran Tiger (Panthera tigris sumatrae) Breeding Season in Conservation Institution in Indonesia.
Abstrak: Harimau Sumatera merupakan satu-satunya subspesies dari Panthera tigris yang masih ada di Indonesia. Harimau Sumatera diklasifikasikan oleh CITES ke dalam Appendix I critically endangered oleh IUCN. Kajian ini bertujuan untuk mengetahui pola reproduksi khususnya musim kawin harimau Sumatera yang berada di habitat ex-situ atau lembaga konservasi di Indonesia. Data didapatkan melalui penelusuran daya reproduksi harimau Sumatera berdasarkan studbook harimau Sumatera regional dan internasional tahun 2004-2010. Data dianalisis secara deskriptif untuk status reproduksi meliputi jumlah anak per kelahiran, musim kawin dan masa produktif. Bulan perkawinan dapat ditentukan berdasarkan bulan terjadinya kelahiran. Penghitungan bulan perkawinan didapatkan dengan cara mengurangi tanggal kelahiran anak dengan rataan lama kebuntingan harimau yang berkisar antara 95 sampai 110 hari atau lebih kurang tiga bulan. Hasil penelusuran dari studbook didapatkan bahwa perkawinan harimau Sumatera merata setiap bulan dalam satu tahun sehingga pada harimau Sumatera yang hidup di lembaga konservasi di Indonesia tidak mempunyai musim kawin.
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Judul: Kepadatan dan Tingkat Perjumpaan Harimau Sumatera (Panthera tigris sumatrae Pocock,1929) Di Ipuh-Seblat Seksi Konservasi Wilayah II Bengkulu, Taman Nasional Kerinci Seblat
Abstrak: Harimau sumatera (Panthera tigris sumatrae) memiliki peran penting dalam kelangsungan dan keseimbangan hutan Sumatera. Hal tersebut menjadikan harimau Sumatera sebagai salah satu key species dalam kegiatan konservasi keanekaragaman hayati di Indonesia. Seiring waktu, populasi satwa langka ini cenderung menurun yang diakibatkan oleh penyusutan mangsa, bencana alam, fragmentasi habitat, ilegal logging, konservasi lahan, perburuan umur dan kemampuan reproduksi. Untuk itu, penelitian ini bertujuan untuk mengetahui kepadatan, tingkat perjumpaan dan pola aktivitas harimau sumater.
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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