Judul: Karakterisasi Morfologi dan Morfometri Nematoda Aphelenchoides besseyi Christie pada Beberapa Varietas Padi.
Abstrak: Aphelenchoides besseyi merupakan nematoda parasit terbawa benih yang menyebabkan penyakit pucuk putih pada padi. Identifikasi A. besseyi secara morfologi dan morfometri pada beberapa varietas padi di Jawa Tengah dan Daerah Istimewa Yogyakarta (DIY) belum pernah dilaporkan, sehingga penelitian ini bertujuan untuk mengetahui keberadaan A. besseyi pada beberapa varietas padi di Jawa Tengah dan DIY serta menelaah karakter morfologi dan morfometrinya. Sampel benih diperoleh dari kios pertanian di Kecamatan Weru (Sukoharjo), Cawas (Klaten), Banguntapan (Bantul), Wonosari (Gunung Kidul), dan hasil perbanyakan petani di Cilacap Selatan (Cilacap). Metode yang dilakukan antara lain: pengambilan sampel benih, ekstraksi nematoda, penghitungan populasi, identifikasi morfologi dan morfometri. A. besseyi ditemukan berasosiasi dengan varietas Pandan wangi, Sintanur, Pepe, Inpari 33, Prima, dan Sembada 168 dengan populasi berkisar 1.4 sampai 27.2 ekor per 5 g benih padi. Ciri khas A. besseyi yang ditemukan bibir set off dengan stomatostilet, bulbus median berukuran besar dan berbentuk oval, star shaped mucro pada ujung ekor. Vulva pada nematoda betina terletak pada 60-75% panjang tubuh, dan spikula pada nematoda jantan berbentuk seperti duri mawar (rose thorn shaped spicule). Hasil pengukuran morfometri dengan karakteristik panjang tubuh (L) (0.55-0.84 μm), panjang stilet (S) (10.81- 12.92 mm), diameter tubuh maksimum (W) (14.09-22.87 mm), panjang ekor (T) (36.93 – 53.51 mm), panjang esofagus (ES) (58.17 – 86.51 mm). Persentase posisi dari katub esofagus dari anterior tubuh sampai setengah dari katub (bulb) dibagi dengan total panjang esofagus dari dasar kelenjar esofagus (MB) (100.11 – 146.52%). Persentase jarak vulva dari anterior dibagi dengan panjang tubuh (V) (55.35-85.67%), a (L/W) (29.58-52.04), b (L/MB) (8.12-14.97), dan c (L/T) (11.94- 19.92).
Keyword: benih, ekstraksi, identifikasi, kios, pengukuran

Judul: Nematoda Pucuk Putih Padi Aphelenchoides besseyi Christie di Sumatera Barat.
Abstrak: Aphelenchoides besseyi is an important pest that could reduce rice production. West Sumatera. This study aims to explore the presence of A. besseyi, to detect and identify seed-borne A. besseyi nematode in West Sumatera utilizing morphology and morphometric characters. Samples of rice seeds used are local varieties of rice and hybrid varieties from Agam District, Lima Puluh Kota District, and Solok District. Methods include nematode extraction from seeds, population counting, morphological and morphometric identification, and preparation of slide preparate. The results of this study showed that A. besseyi have infected Junjuang, Sokan, Kuriak, Pulau Sarundang, Sarundang Baru, Batang Pasaman, Pulau Bendang, Pulau Mundam, Bendang Baru, 42 C, Pulut Merah, CK, Mundam Pasaman, Damasraya, Koritiang, Ale-Ale, Hitam Putih, Sijunjung, Junjuang, Sokan, Marujang Bujang, Batang Piaman, Anak Daro, Cisokan, PB 42, and 42 C with number of nematode populations from 1.56-125.44 / 10 g of seed. The morphological characters of A. besseyi found were a vermiform body, slender, smooth body annulation, set off lips, a spear-like stylet with an enlarged knob at the base, a large and oval-shaped median bulb, clear esophageal ring, overlapping esophagus, vulva located at 60 -75% of the body, the posterior part of the body of the male nematode is curved up to 90 °, the spicules are rose thorns, and 2-3 star shaped mucros. Morphometric characteristics with total body length (L) 362.54-672.70 μm, stilet length (S) 9.80-14.01 μm, body diameter (D) 10.41-16.86 μm, tail length (T) 23.81-39.66 μm, vulva distance from anterior divided by total body length (V) 54.48-75.97%, L / D (A) 33.86-63.58 μm, L / distance of the esophageal base from the anterior (B) 5.18-9.97 μm, L / T (C) 9.84-26.04 μm.
Keyword: Aphelenchoides besseyi, morphology, morphometric, rice seed

Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4