Judul: Inventarisasi Parasit Metazoa Pada lkan Gabus Laut (Saurida undosquamis Richardson, 1848). Ikan Samgeh (Atrobucca nibe Jordan dan Thompson, 191 1) dan lkan Gelang Mudin (Upeneus taeniopterus Cuvier, 1829) dari Tempat Pelelangan lkan Pelabuhan Ratu, Jawa Barat
Abstrak: Parasit adalah organisme yang hidup pada tubuh organisme lain dan umumnya menimbulkan efek negatif pada organisme yang ditempati tersebut. Salah satu organisme yang sering terserang parasit adalah ikan. Infeksi parasit dapat menyebabkan perubahan morfologi, penurunan bobot tubuh bahkan dapat menyebabkan penyakit pada ikan. Parasit juga dapat menyebabkan penyakit pada manusia (zoonosis). Informasi tentang parasit ikan dapat digunakan untuk pengembangan usaha budidaya ikan dan juga untuk kepentingan kesehatan masyarakat.
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Judul: Inventarisasi Parasit pada Ikan Laut
Abstrak: Organisme parasit diketahui sebagai organisme yang hidupnya menumpang pada organisme lain, termasuk ikan. Tidak kurang dari 10.000 spesies parasit diketahui menginfeksi ikan. Adanya parasit di tubuh ikan dapat mengurangi nilai ekonomis ikan. Keberadaan parasit dapat menghambat perkembangan udaha budidaya juga berkaitan dengan kesehatan masyarakat. Dengan demikian informasi tentang parasit ikan diperlukan untuk membantu mengatasi masalah-masalah serangan psrasit di usaha budidaya, juga mencoba untuk memberikan informasi kepada masyarakat tentang zoonosis.
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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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