Judul: Identifikasi Dan Uji Postulat Koch Cendawan Penyebab Penyakit Pada lkan Gurami (Osphronemus gouramy Lac.).
Abstrak: Budidaya ikan gurami (Oshpronemus gouramy Lac.) telah dikembangkan secara intensif, yaitu dengan tingginya padat penebaran dalam volume terbatas. Apabila tidak dikontrol secara benar akan menimbulkan resiko berupa munculnya serangan penyakit, yang salah satunya disebabkan oleh cendawan. Terbatasnya informasi mengenai jenis cendawan yang dapat menyerang ikan tersebut, mendorong dilakukannya penelitian ini. Selain itu dilakukan juga uji relfeksi untuk mengetahui tingkat patogenitas cendawan yang berhasil diisolasi dan diidentifikasi. Penelitian ini dilakukan dari pertengahan bulan Agustus sampai akhir Oktoher 2002, di laboratorium Kesehatan Ikan dan Laboratorium. Lingkungan, Jurusan Budidaya Perairan, Fakultas Perikanan dan Ilmu Kelautan, Institut Pertanian Bogor.
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Judul: Uji Postulat Koch Bakteri dari Ikan Gurami Osphronemus gourami Sakit Asal Balai Pengembangan Teknologi Perikanan Budidaya (BPTPB) Sleman, Daerah Istimewa Yogyakarta
Abstrak: Ikan Gurami (Osphronemus gouramy) merupakan salah satu komoditas perikanan budidaya yang banyak diminati oleh konsumen ikan air tawar. Salah satu kendala dalam budidaya ikan gurami adalah sering terjadinya wabah penyakit yang menyebabkan terjadinya kematian. Pada Oktober 2019 terjadi wabah penyakit ikan gurami di Balai Pengembangan Teknologi Perikanan Budidaya (BPTPB), Unit Kerja Budidaya Air Tawar (UKBAT) Kulonprogo, Daerah Istimewa Yogyakarta. Penelitian ini bertujuan untuk mengidentifikasi jenis bakteri dan menguji Postulat Koch bakteri asal induk gurami yang terjangkit penyakit. Isolat bakteri yang diidentifiaksi berasal dari ikan gurami yang terjangkit penyakit. Jumlah isolat yang diamati yaitu 8 isolat diantaranya adalah isolat bakteri A, B, C, D, E, F dan G. Isolat tersebut diambil dari sampel ikan gurami yang berbeda-beda. Identifikasi dilakukan dengan mengamati hasil karakterisasi morfologi dan fisiologi bakteri, melalui pengamatan koloni bakteri, pewarnaan Gram, uji OF, uji motilitas, uji katalase dan uji oksidase. Bakteri kemudian diuji patogenisitasnya melalui prosedur Postulat Koch. Hasil identifikasi menunjukkan isolat bakteri A, C, F dan G diduga merupakan kelompok Aeromonas sp., isolat bakteri B, E dan H merupakan Staphylococcus sp, isolat bakteri D merupakan kelompok Streptococcus spp. Setelah diinjeksiakan ke ikan gurami ukuran 8-10 cm dengan kepadatan bakteri 107 CFU mL-1 dan dosis 0,1 mL/ekor, ikan gurami menunjukkan gejala klinis berupa sirip geripis, tubuh pucat, sisik lepas, dropsi, exopthalmia, kurang aktif berenang, berada di dasar, hingga kematian. Adanya gejala tersebut menunjukkan bahwa bakteri bersifat patogen untuk ikan gurami.
Keyword: Osphronemus gouramy, bacteria, disease, pathogens

Judul: Enhancement of photon absorbtion on BaxSr1-xTiO3 thin films semiconductor using photonic crystals.
Abstrak: In this research, has been conducted BaxSr1-xTiO3 (BST) thin films manufacturing for mole fraction x = 0.25, 0.35, 0.45, and 0.55; and concentration of 1 molar using chemical solution depositon (CSD) method. The materials, which are used in this research, are barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%], titanium isopropoxide [Ti(C12O4H28), 97.999%], gallium trioxide [Ga2O3], 2-methoxyethanol [H3COOCH2CH2OH, 99%] and 1 x 1 cm of transparent conductive oxide (TCO) glass as substrate. Two BST thin films are made that for BST thin films which are doped by 10% galium (BGST) as p-type layer and pure BST solution as n-type. BST solution is made by reacting barium acetate [Ba(CH3COO)2, 99%], strontium acetate [Sr(CH3COO)2, 99%] and titanium isopropoxide [Ti(C12O4H28)] into 2-methoxyethanol solvent [H3COOCH2CH2OH, 99%] in accordance with mass gram for each x value. While, BGST solution is made in the same way as BST solution, plus adding gallium at 10% of the mass of BST. Once all materials are reacted, then vibrated using ultrasonic for 90 minutes, and followed by coating BGST / BST on the TCO substrate. Once the layer is formed, then annealed for 15 hours at temperature of 500 °C with increasing rate of 1.67 oC/minute. Characterizations of BST thin films with or without photonic crystals include the absorbance and transmittance in the visible light spectrum, as well as the electrical photoconductivity characterizations. From BST thin films without photonic crystals indicate that our thin films have light absorption area on almost the entire range of the visible light spectrum even to the infrared range with absorption value over than 67.6%, in addition, it can be seen that the maximum absorbance of BST thin films for all mole fractions lie in blue to green light spectrum region, 457 nm ≤ λ ≤ 570 nm and the minimum in yellow to red light spectrum region, 570 nm ≤ λ ≤ 678 nm. The largest absorbance is found at x = 0.25 with average absorbance value of 92.04% and maximum and minimum absorbance peaks at wavelength of 500.89 and 657.72 nm, respectively. At x = 0.35, average absorbance value decreased to 83.55% with maximum and minimum peaks at 505.73 and 613.68 nm, respectively. Then increased to 91.16% at x = 0.45 with maximum and minimum peaks at 506.04 and 618.56 nm, respectively. At x = 0.55, average absorbance value decreased to 80.12% with maximum and minimum peaks at 507.85 and 608.79 nm, respectively. Moreover, it can be seen that the addition of barium mole fraction leads to wider maximum absorbance or minimum transmittance peaks and narrower minimum absorbance or maximum transmittance peaks in the same range of the green and blue & red light spectrums, respectively. BST thin films with photonic crystals show increasing in absorption for all x values in the range of 3.04 into 13.33%. At x = 0.25, average absorbance percentage increased 3.96% from 92.4 into 95.68%, for x = 0.35 average percentage increased 7.07% into 89.45 from 83.55%. Furthermore, average absorbance of BST thin films at x = 0.45 increased 3.04% from 91.16 into 93.93% and x = 0.55 has
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