Judul: Analisis Sifat Kristal Dan Sifat Optik Pada Keramik SrTiO3 Didadah RuO2
Abstrak: Sintesis keramik Stronsium Titanat (SrTiO3) didadah Rutenium Oksida (RuO2) metode reaksi padatan (solid state) telah berhasil dilakukan. Keramik di annealing dengan suhu 850C. Karakterisasi keramik Stronsium Titanat (SrTiO3) didadah Rutenium Oksida (RuO2) dengan variasi konsentrasi pendadah (0%; 0,5%; 1%) dilakukan untuk mengetahui pengaruh konsentrasi pendadah Rutenium Oksida (RuO2) terhadap sifat kristal dan sifat optik pada keramik Stronsium Titanat (SrTiO3). Struktur kristal keramik berbentuk kubus dengan ukuran parameter kisi a=b=c berturut-turut senilai 3,905 Å; 3,905 Å; dan 3,903 Å. Sifat optik keramik ditunjukkan dengan optik longitudinal dan transversal yang berada pada bilangan gelombang 261-937 cm-1 dan nilai energi celah pita sebesar 3,48 eV-3,56 eV., The synthesis of Strontium Titanate (SrTiO3) ceramic doped with Ruthenium Oxide (RuO2) using the solid-state reaction method has been successfully conducted. The ceramics were annealed at a temperature of 850°C. Characterization of Strontium Titanate (SrTiO3) ceramic doped with Ruthenium Oxide (RuO2) with varying dopant concentrations (0%; 0.5%; 1%) was performed to understand the influence of Ruthenium Oxide (RuO2) dopant concentration on the crystal properties and optical properties of Strontium Titanate (SrTiO3) ceramics. The ceramic's crystal structure is cubic with lattice parameter sizes of a=b=c, respectively, measuring 3.905 Å; 3.905 Å; and 3.903 Å. The optical properties of the ceramic are indicated by longitudinal and transverse optics in the wavenumber range of 261-937 cm-1 and a bandgap energy value ranging from 3.48 eV to 3.56 eV.
Keyword: ceramic, crystal properties, optical properties

Judul: Analisis Sifat Kristal dan Optik di dalam Keramik SrTiO3 didadah Cuprum(II) asetat
Abstrak: Analisis keramik SrTiO3 dengan pendadah Cuprum(II) asetat (Cu(CH3COO)2), variasi konsentrasi pendadah yang digunakan 0%; 0,5%; dan 1% menggunakan metode reaksi padatan (solid state reaction) berhasil dilakukan. Proses annealing dilakukan mulai dari suhu ruang kemudian dinaikkan hingga suhu annealing 850 oC dengan kenaikan suhu 1,67 oC/menit dan ditahan konstan selama 8 jam. Berikutnya dilanjutkan dengan proses pendinginan sampai kembali pada suhu kamar selama 13 jam. Analisis data XRD menggunakan metode Cramer-Cohen menghasilkan parameter kisi a sebesar 3,909 Å; 3,906 Å; dan 3,905 Å, berstruktur kristal kubik. Menentukan nilai Optik Longitudinal (LO) dan Optik Transversal (TO). Nilai energi bandgap yang dihasilkan dari analisis dengan fungsi Kubelka-Munk dan metode tauc plot untuk direct transition berkisar 3,559 eV-3,322 eV., Analysis of SrTiO3 ceramics with Cuprum(II) acetate (Cu(CH3COO)2) , the various concentrations of the scavenger used were 0%; 0,5%; and 1% using the solid state reaction method was successfully carried out. The annealing process was carried out starting at room temperature and then raised to an annealing temperature of 850 oC with a temperature increase of 1,67 oC /minute and held constant for 8 hours. Then proceed with the cooling process until it returns to room temperature for 13 hours. XRD data analysis using the Cramer-Cohen method yielded lattice parameters a of 3,909 Å; 3,906 Å; and 3,905 Å, with a cubic crystal structure. Determine the Longitudinal Optic (LO) and Transverse Optic (TO) values. The bandgap energy values resulting from the analysis using the Kubelka-Munk function and the tauc plot method for the direct transition range from 3,559 eV to 3,322 eV.
Keyword: lattice parameters, longitudinal optic, solid state reaction, SrTiO3, transversal optic

Judul: Co-infection of Infectious Myonecrosis Virus (IMNV) and Vibrio harveyi in Pacific White Shrimp (Litopenaeus vannamei)
Abstrak: L. vannamei production in Indonesia was growing intensively. In 2006, IMN (infectious myonecrosis) disease was confirmed spread to Indonesia shrimp farm and declined shrimp production. The study was conducted to investigate effect of dose of V. harveyi on co-infection with IMNV in L. vannamei as well as development of viral infection. Shrimps juvenile were oral infected with IMNV infected shrimps 10 % feeding rate during 3 days and co-infected with 106, 107 and 108 cfu/ml V. harveyi. Mortality rate was 0 % in control and single infection of V. harveyi except 108 cfu/ml treatment. Mortality pattern demonstrated on co-infection was faster and higher than single IMNV infection in 14 days observation. The density of green colony Vibrio in hepatopancreas of co-infected shrimps collected in 2, 4, 6, 8 and 10 days post infection were higher than V. harveyi single infected (significantly in 10 days post infection). There were no difference of IMN disease development between co-infection and IMNV single infection. It was confirmed by visual gross sign appeared, tissue and lymphoid organ histophatology, organ abnormality, and PCR test. In conclusion, IMN disease caused higher and faster mortality on co-infection with V. harveyi, but not affect to IMN disease development.
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