Judul: Keragaman Morfologi dan Anatomi Kawista (Limonia acidissima L.) di Kabupaten Rembang
Abstrak: Kawista or Kawis (Limonia acidissima L.) is a unique fruit in Rembang Regency, Center of Java that used to produce syrup tasted like cola favour. Kawista trees in Rembang are quite a lot, but their population could decrease due to replanting from seeds need 15 years to be fruiting. Kawista diversity in this area has not been reported. The objective of this research was to analyze the diversity of kawista in Rembang. Tree samples were taken randomly and proportionally according to the number of kawista trees in five subdistricts in Rembang regency. Morphological characters observed were length and width of leaf, leaf color, fruit diameter, fruit color, and stem color. Anatomical characters were observed on the paradermal and transversal leaf section preparates. Morphological, anatomical data, and both were analyzed separately using NTSYS ver. 2.1 and the relationship among kawista tree samples from 5 subdistricts in Rembang was grouped on similarity dendrogram. Based on the leaf morphology, fruit, and stem color of kawista trees, from 5 subdistricts in Rembang regency have not 100% similarity and quite diverse, although some trees were very similar, but not always from the same subdistrict. Kawista tree based leaf anatomy was diversed if compared to their morphology. However, based on morphology and anatomy character of kawista tree in Rembang has 75% similarity.
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Judul: Inventory of Pests and Diseases of Kawista Plants (Limonia acidissima) in Tuban Regency
Abstrak: Tanaman kawista (Limonia acidissima L.) merupakan tanaman buah tropis langka, berasal dari India bagian Selatan. Buah kawista berpotensi memiliki nilai ekonomi cukup tinggi, dimanfaatkan sebagai obat herbal, produk makanan olahan seperti sirup dan selai, atau dapat dikonsumsi langsung. Di Indonesia, tanaman kawista tersebar sebagai tanaman budidaya pekarangan yang banyak dijumpai di daerah pesisir. Tujuan penelitian ini adalah menginventarisasi hama dan penyakit tanaman kawista di daerah pesisir Kabupaten Tuban, Jawa Timur. Metode penelitian dimulai dengan survey penentuan lokasi percobaan lapang menggunakan teknik purposive sampling, diikuti wawancara terhadap petani berkenaan dengan budidaya kawista yang mereka miliki, dilanjutkan dengan pengamatan serta pengambilan contoh hama, penyakit, dan foto gejala kerusakan tanaman untuk selanjutnya diidentifikasi di laboratorium. Pengamatan dilakukan terhadap 32 contoh tanaman kawista petani berlokasi di sebelas desa. Hasil identifikasi menunjukkan bahwa hama perusak tanaman kawista adalah kutu perisai Aonidiella aurantii, ulat pemakan daun Papilio demoleus, Orgyia spp., ulat kantung Amatissa sp., dan kumbang moncong Hypomeces squamosus. Selain itu, ditemukan gejala lubang gerigitan pada buah, bekas makan bajing kelapa Callosciurus notatus, dan kerusakan batang oleh rayap Coptotermes sp. Penyakit kawista yang ditemukan adalah huanglongbing Candidatus liberibacter asiaticus, karat daun merah Cephaleuros sp., blendok Botryodiplodia theobromae, puru mahkota Agrobacterium tumefaciens, dan busuk buah Rhizopus sp., The kawista plant (Limonia acidissima L.) is a rare tropical fruit plant, originating from Southern India. Kawista fruit has the potential to have quite high economic value, used as herbal medicine, processed food products such as syrup and jam, or can be consumed directly. In Indonesia, the kawista plant were spread as a garden cultivation plant which are often found in coastal areas. The purpose of this study was to inventory pests and diseases of the kawista plant in the coastal area of Tuban Regency, East Java. The research method began with a survey to determine the location of the field trial using a purposive sampling technique, followed by interviews with farmers regarding their kawista cultivation, followed by observing and taking samples of pests, diseases, and photos of symptoms of plant damage for further identification in the laboratory. Observations were made on 32 samples of kawista from farmers located in eleven villages. The identification results showed that the pests that damaged the kawista plant were red scale Aonidiella aurantii, leaf-eating caterpillar Papilio demoleus, Orgyia spp., bagworm moth Amatissa sp., and the snout beetle Hypomeces squamosus. In addition, symptoms of gnawing holes were found on the surface of the fruit, due to the eating activity of the coconut squirrel Callosciurus notatus, and stem damage by the termite Coptotermes sp. The kawista diseases found were huanglongbing Candidatus liberibacter asiaticus, red rust Cephaleuros sp., stem rot diseases Botryodiplodia theobromae, galls on twigs and stems of Agrobacterium tumefaciens, and fruit rot Rhizopus sp.
Keyword: buah tropis, obat herbal, pekarangan, pesisir, coastal, garden plant, herbal medicine, tropical fruit

Judul: Pembuatan dan Karakterisasi FET Berbasis Zinc Oxide (ZnO) untuk Sensor Sensor Ultra Violet (UV)
Abstrak: Sensor Field Effect Transistor (FET) dibuat dari oksida logam, logam, polimer konduktif organik, dan semikonduktor. Sensor FET terdiri atas tiga lapisan, yaitu lapisan zinc oxide sebagai lapisan aktif, lapisan SiO2 sebagai insulator dan lapisan silikon tipe-p. Sensor FET berbasis ZnO sensitif terhadap cahaya UV, yang dapat dilihat dari hasil karakterisasi arus-tegangan dan karakterisasi respons dinamik yang menunjukkan respons terhadap adanya cahaya UV. Respon sensor FET terhadap cahaya UV memperlihatkan terjadinya peningkatan arus drain-source, dikarenakan terjadinya penurunan resistansi pada daerah lapisan zinc oxide. Respon sensor FET terhadap cahaya UV memperlihatkan bahwa apabila sensor diberikan cahaya UV maka terjadi peningkatan arus drain-sourceakibat adanya penurunan resistansi lapisan ZnO. Respon dinamik sensor FET memperlihatkan adanya perubahan tegangan output saat diberikan cahaya. Terjadi penurunan tegangan output saat diberikan cahaya UV pada setiap peningkatan intensitas. Sensor FET memiliki waktu respon sekitar 2.6 detik dan waktu pemulihan sekitar 2.8 detik. Hasil ini menunjukkan bahwa sensor FET memiliki waktu respons yang lebih cepat dari pada waktu pemulihannya
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