Judul: Elektrode Pasta Karbon Termodifikasi Kuersetin untuk Analisis Ion Tembaga(II) secara Voltammetri
Abstrak: Quercetin is a flavonoid compound that can form stable complexes with various metal ions. Its use as a modifier for carbon paste electrode is expected to improve sensitivity in measurement by voltammetry. Quercetin-modified carbon paste electrode used for copper(II) ions analysis was evaluated in terms of the effect of some parameters such as quercetin composition, scan rate, pH, preconcentration time, preconcentration potential, and linearity of measurement. Copper-(II) ions analysis with cyclic voltammetry at potential range of -0.5–1.0 V resulted well-defined 2 pairs of reduction-oxidation peaks with the optimum conditions for reliable measurement were 0.1 M NaCl pH 6, and 5% quercetin. The cyclic voltammetry response was linear with the determination coefficient 0.995 in the concentration range of CuCl2 2.0–100 mM. Anodic stripping voltammogram resulted the optimum preconcentration potential of -600 mV and preconcentration time of 80 s. The anodic stripping voltammogram was linear with the determination coefficient 0.983 in the concentration range of CuCl2 0.2– 0.8 mM. This modified electrode increases the intensity of the current and can be developed for environmental samples measurement.
Keyword: anodic stripping voltammetry, copper(II), electrode, quercetin

Judul: Elektrooksidasi Reduksi Tembaga(II) dan Perak(I) pada Elektrode Pasta Karbon Termodifikasi Kuersetin
Abstrak: Quercetin is one of flavonoids that can form complexes with metal ions to be used as a modifier of carbon paste electrodes. The initial step to determine the performance of quercetin modified carbon paste electrode is by looking for patterns of elektrooxidation reduction with cyclic voltammetry method. Voltammogram cyclic of ions Cu(II) and Ag(I) produces anodic and cathodic peaks that are quasireversible. The increase in the anodic and cathodic current intensity were 7.55% and 60.89%, respectively, for Cu (II), while those for Ag (I) were 41.52% and 194.46%, respectively. Voltammogram of mixture of Cu(II) and Ag(I) produced two pairs of anodic and cathodic peaks that can be used for analysing mixture of Cu(II) and Ag(I).
Keyword: Bogor Agricultural University (IPB), voltammetry, silver(I), copper(II), quercetin, electrode

Judul: Prolapsus vagina kronis, kausa dan teknik reposisinya
Abstrak: Prolapsus vagina kronis merupakan penyembulan bagian belakang hewan, khususnya lantai vagina melalui vulva, diikuti dengan perpindahan serviks dan uterus ke belakang. Pada sapi kejadian prolapsus vagina sering pada masa 2-3 bulan akhir kebuntingan, sedangkan pada domba dan hewan sejenisnya terjadi beberapa minggu sebelum melahirkan. Kasus prolapsus vagina kadang-kadang dapat terjadi setelah melahirkan, dan jarang terjadi tanpa ada hubungannya dengan kebuntingan atau kelahiran. Penyebab prolapsus vagina kronis belum dapat dipastikan, beberapa faktor umumnya ambil bagian. Faktor uta- ma adalah tingginya kadar hormon estrogen pada akhir kebuntingan. Faktor mekanis dengan meningkatnya tekanan intra abdominal dan gaya berat dari fetus dalam kandungan. Beberapa faktor predisposisi yang dapat menunjang terjadinya prolapsus vagina adalah: perlukaan saluran kelahiran, kelahiran yang rapat, makanan yang kurang baik, terbatasnya pergerakan, faktor lingkungan dan hereditas. Prolapsus vagina kronis umumnya hampir terjadi pada semua hewan piara, lebih sering pada sapi dan domba. Pada sapi sering terjadi pada sapi potong jenis Hereford ...
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