Judul: Variasi Karakter Morfometrik Gastropoda Berdasarkan Karakteristik Habitat Mangrove di Kawasan Bee Jay Bakau Resort, Probolinggo
Abstrak: Beejay Bakau Resort (BJBR) in Probolinggo is a mangrove ecotourism rehabilitation area that has been planted for a long period. There are seven different varieties of mangroves in the BJBR area. The mangrove environment in BJBR is in good shape, and the local population used to catch shellfish in large quantities, but there is a section of the mangrove that has been harmed and even killed as a result of human activity (anthropogenic). The presence of related biota or gastropods is strongly influenced by the density of mangroves as the ecosystem's principal constituent. Gastropods play a crucial function in the mangrove ecosystem's food chain cycle. Environmental factors, food, and predators all influence the abundance and distribution of gastropods. The abundance of mangrove litter occurs because the density of mangroves is also great, allowing the snail to feed on the litter. This study took place in the BJBR area in December 2020. Purposive sampling approach was used to determine sampling based on the existence of mangrove vegetation zoning. The quadratic transect method was used to collect gastropod and mangrove vegetation data, while environmental parameters were measured in situ. Principal Component Analysis was used to investigate the association between morphometric characters and snail species (PCA). Correspondent Analysis was used to examine the link between research stations and morphometric features (CA). The findings revealed that there are seven families of gastropods in the BJBR area (Ellobiidae, Littorinidae, Potamididae, Nassaridae, Cerithiidae, and Muricidae) and 23 species of gastropods. The study station's average gastropod diversity and uniformity are in the middle range, while dominance is in the low range. Because numerous medium and big gastropods were found in the area, gastropods have a relationship between fluctuations in environmental variables and high mangrove density. A sedimentary substrate with clay proportion is present at all research stations. The findings of this study may be relevant in developing BJBR management policy based on mangrove ecotourism.
Keyword: abundance, Bee Jay Bakau Resort, gastropods, mangrove

Judul: Biologi Populasi Kerang (Telescopium telescopium dan Cerithidea obtusa) dan Keterkaitannya dengan Karakteristik Habitat Mangrove di Kawasan Beejay Bakau Resort, Probolinggo
Abstrak: Ekosistem mangrove BeeJay Bakau Resort (BJBR) adalah ekosistem mangrove rehabilitasi seluas 89 ha yang dimanfaatkan masyarakat sekitar untuk mencari berbagai macam sumberdaya, salah satunya adalah gastropoda. Gastropoda merupakan biota yang dapat ditemukan secara luas baik di darat, air, dan sebagian di ekosistem mangrove. Dua spesies yang banyak ditemukan adalah Telescopium telescopium dan Cerithidea Obtusa. Biota ini memiliki potensi untuk dikembangkan menjadi bioindikator, secara ekonomi, dapat pula dimanfaatkan untuk dijual dan dikonsumsi. T. telescopium memiliki kandungan protein sebesar 12,16% dan lemak 0,38%. C. obtusa memiliki kandungan gizi protein 13,8% dan lemak 2,8%. Pemanfaatan yang berlebihan dapat menyebabkan menurunnya kelimpahan dari gastropoda. Berdasarkan potensi tersebut, dua spesies yang dapat ditemukan di pesisir Probolinggo Jawa Timur menarik untuk ditelaah lebih lanjut mengenai interaksinya dengan ekosistem mangrove untuk dapat dikelola secara berkelanjutan. Penelitian ini dilakukan pada Bulan Desember 2020 di ekosistem mangrove BJBR, Probolinggo. Penentuan stasiun dilakukan dengna menggunakan purposive sampling berdasasrkan karakteristik ekosistem mangrove. Pengumpulan data gastropoda dilakukan dengan menggunakan transek kuadran gastropoda (1x1m). Karakteristik lingkungan di semua stasiun dianalisis menggunakan PCA (Principal Component Analysis) sedangkan sebaran gastropoda berdasarkan struktur ekosistem mangrove dianalisis menggunakan CA (Correspondence Analysis). Hasil penelitian menunjukkan bahwa kelimpahan gastropoda T. telescopium sebesar 144 ind dan C. obtusa sebanyak 29 ind. T. telescopium memiliki kepadatan yang lebih tinggi dibandingkan C. obtusa dengan pola persebaran mengelompok hampir di seluruh stasiun. Secara umum, kedua jenis gastropoda memiliki pola pertumbuhan allometrik negatif dengan kondisi yang baik untuk dimanfaatkan karena memiliki bentuk yang montok. Kehidupan gastropoda dipengaruhi oleh karakteristik ekosistem mangrove. C. obtusa berkuran kecil dan besar berasosiasi dengan mangrove dengan kerapatan jarang A. marina (<10). T. telescopium berkuran kecil berasosiasi dengan mangrove R. mucronata (<10). T. telescopium berukuran sedang dapat ditemukan di mangrove R. stylosa (≥ 15) kerapatan tinggi. Sedangkan T. telescopium besar dapat ditemukan di mangrove A. marina dan R. mucronata dengan kerapatan sedang hingga tinggi (≥ 15 dan ≥ 10 - <15).
Keyword: Beejay Bakau Resort, gastropoda, abundance, mangrove

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition