Judul: Inventarisasi Nematoda Parasit Padi (Oryza Sativa L.) Di Daerah Rengasdengklok, Karawang
Abstrak: Penelitian ini bertujuan untuk mengetahui keberadaan sebaran dan kerapatan absolut nematoda yang berpotensi sebagai paras it penting padi sawah sehubungan dengan perbedaan gOlongan pengairan di wilayah Kecamatan Rengasdengklok. Contoh tanah dan tanaman padi diambil dari Desa Amansari, Kutamukti, Jayakerta dan Kampungsawah yang terletak di Kecamatan Rengasdengklok, Kabupaten Karawang. Pengamatan dilaksanakan di Laboratorium Nematologi Jurusan Hama dan Penyakit Tumbuhan, Fakultas Pertanian IPB, dari bulan Februari sampai April 1996. Ekstraksi nematoda dari tanah dan akar menggunakan metode pengabutan. Pengamatan dilakukan terhadap j enis, kerapatan absolut dan sebaran nematoda paras it padi di daerah tersebut. Identifikasi nematoda dilakukan dengan bantuan buku petunjuk Identifikasi bergambar dari Mai dan Lyon (1975). Nematoda yang ditemukan pad a padi adalah Hirschmanniella spp. yang diketahui sebagai salah satu parasit penting padi dan beberapa nematoda famili Dorilaimidae yang belum diketahui sifatnya. jenis, sebaran dan kerapatan absolut nematoda. Salinitas air tanah yang berasal dari arus pasang surut air laut diduga menjadi faktor pembatas utama bagi kehidupan nematoda parasit padi di daerah tersebut. Kerapatan absolut Hirschmaniella spp. di daerah Rengasdengklok diperkirakan sudah merugikan secara ekonomi meskipun masih dibawah ambang pengendalian.
Keyword: 

Judul: Inventarisasi nematoda parasit padi sawah di Bogor
Abstrak: Penelitian ini bertujuan untuk mengetahui jenis dan penyebaran nematoda parasit padi sawah di Bogor. Penelitian dilaksanakan di Laboratorium Nematologi Jurusan Hama dan Penyakit Tumbuhan Fakultas Pertanian IPB, dari bulan Februari sampai April 1995. Contoh tanah dan akar padi diambil dari pertanaman padi sawah di daerah Rumpin, Jasinga, Cigudeg, Leuwiliang dan Sindangbarang. Lebih kurang 1 1 tanah dan 150 g akar diambil dan diekstraksi dengan menggunakan metode pengabutan. Pengamatan dilakukan terhadap jenis nematoda, jumlah populasi dan jumlah puru. Identifikasi dilakukan dengan pengamatan preparat semipermanen nematoda. Nematoda parasit yang ditemukan adalah nematoda puru akar (Meloidogyne sp.) dan nematoda lesio akar (Hirschman- niella sp.). Di samping itu ditemukan juga nematoda dari famili Dorylaimidae yang sifat parasitiknya belum dike- tahui. Nematoda lesio akar terdapat di semua daerah contoh, sedangkan nematoda puru akar terdapat di Leuwiliang, Sindangbarang, Cigudeg dan Jasinga. Populasi Hirschmanniella sp. tertinggi ditemukan pada contoh akar dari Leuwiliang, sedang Meloidogyne sp. dari Sindangbarang. Rata-rata jumlah puru akar tertinggi dite- mukan di Jasinga. Hasil ekstraksi contoh tanah ditemukan larva kedua Meloidogyne sp. dengan populasi tertinggi dari Cigudeg.
Keyword: 

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
Keyword: