Judul: Identifikasi dan Uji Patogenisitas Penyebab Penyakit Hawar Daun pada Suren (Toona sureni Merr.)
Abstrak: Pada pesemaian suren di Pongpoklandak, telah ditemukan adanya serangan penyakit daun yang sampai saat ini belum diietahui dengan pasti penyehabnya, namun diduga bempa fungi atau cendawan. Gejala penyakit yang terjadi antara lain adanya gejala nekrotis berupa hawar (blight) yang menyebar pada daun dan secara perlahan meluas menyebabkan daun menjadi layu dan rontok, selain itu pada permukaan daun sehat yang tertular timbul sekumpulan benang-benang halus menyerupai hifa. Penyakit ini bersifat menular dalam warn yang relatif cepat sehingga hampir 70% dari jumlah bibit suren seluruhnya terserang, mulai dari gejala yang ringan sampai berat yang menyebabkan kematian bibit.
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Judul: Hawar daun bibit pinus merkusii yang disebabkan oleh Pestalotia theae di Pesemian
Abstrak: Penyakit Hawar Daun bibit Pinus merkusii di pesemaian mulai dirasakan mengganggu sistem pengadaan bibit pinus di pesemaian. Namun demikian masih sedikit informasi yang ada mengenai besar kerugian akibat penyakit ini, identitas patogen penyebabnya, patogenesis, epidemiologi, serta cara pengelolaan penyakit. Penelitian telah dilakukan dengan tujuan untuk mengetahui: (a) kerugian akibat penyakit ini, (b) jenis patogen dan gejala penyakit, (c) mekanisme serangan patogen dan mekanisme pertahanan bibit pinus, (d) hubungan komponen epidemi dengan perkembangan penyakit, (e) pengaruh tapak pesemaian terhadap perkembangan awal penyakit, (f) kemungkinan adanya jenis inang lain patogen dan kemungkinan tanah lapisan atas sebagai sumber inokulum, serta (g) keefektivan difenokonazol dan mankozeb untuk pengendalian penyakit.
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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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