Judul: Studi mekanisme pertahanan langkap (Arenga obtusifolia Blumme ex Mart.) terhadap herbivory di Taman Nasional Ujung Kulon Jawa Barat
Abstrak: Taman Nasional Ujung Kulon merupakan habitat terakhir badak Jawa (Rhinoceros sondaicus Desmarest 1822) dengan populasi yang relatif kecil (± 47: 27-56 ekor, MacGriffiths, 1993). Dinamika ekologis (ekosistem) di kawasan yang menjadi habitat badak Jawa akan mempengaruhi perkembangan populasinya. Salah satu aspek penting tekanan biologis yang terjadi terhadap habitat badak Jawa adalah suksesi vegetasi khususnya adanya kecenderungan invasi langkap. (Arenga obtusifolia) dan kaitannya dengan penyediaan tumbuhan pakan badak (Muntasib, et al., 1992). Berdasarkan kondisi tersebut, sangat penting dilakukan penelitian yang bertujuan untuk mengidentifikasi karakteristik ekologi langkap, khususnya yang berhubungan dengan kapabilitas invasi dan pengaruhnya terhadap dinamika habitat badak Jawa (Haryanto, 1992). Tujuan penelitian ini adalah mengidentifikasi mekanisme perta- hanan buah langkap terhadap herbivory, yang terdiri atas identifikasi jenis satwa liar pelaku herbivory; identifikasi kelas umur buah yang dikonsumsi dan identifikasi mekanisme interaksi, serta menganalisis kandungan natrium oksalat dalam pendugaan mekanisme pertahanan lang- kap terhadap herbivory; menganalisis golongan senyawa metabolit se- kunder dan analisis proksimat. Pengamatan lapangan dilakukan di Resort Cibunar pada bulan Januari 1995 yaitu dengan pengamatan langsung dan pengamatan tak langsung. Analisis kandungan senyawaan kimia dilakukan pada bulan Juli 1995 meliputi analisis kandungan natrium oksalat dengan metode titrasi oksidi-reduktometri dan uji umum golongan senyawaan metabolit sekunder (alkaloid, flavonoid dan terpenoid) dilakukan di Lab Kimia Analitik Jurusan Kimia P-MIPA IPB; sedangkan analisis proksimat dilakukan di Lab Biokimia dan Lab Kimia Analisis Terpadu IPB. ...
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Judul: Pengaruh Pengendalian Langkap (Arenga obtusifolia) Terhadap Komposisi Tumbuhan Pakan Badak Jawa (Rhinoceros sondaicus
Abstrak: Langkap is a plant that invades on javan rhino habitat. Thus, a proper control management of langkap needs to be carried out by using logging method. Research study in the effect of langkap control management of the plant composition is done to determine effectiveness of logging methods. Research had been conducted during in June 2013 at Kalejetan Resort, Selokan Bayun- Seuseupan Block, Ujung Kulon National Park. Data were collected using vegetation analysis in eight plots of control management to monitor the diversity of plants, and also to monitor 53 control plots to find out the correlation between javan rhino visitations and langkap control management. Based on the result of the research, cut-leave logging method is the best method to conduct. Furthermore, by eliminating seedling and sapling of langkap will also increase the diversity number of javan rhino food plants. Increasing numbers of javan rhino visitation on the sites known related to the growing levels of javan rhino food plants.
Keyword: Ujung Kulon National Park., langkap, javan rhino, control management

Judul: Photosensor producing based on ferroelectric material of Ba0,5Sr0,5TiO3 doped by Ferrium Oxide (Fe2O3) on a P-Type Silicon Substate Si (100) applied as a digital camera with a single pixel image sensor
Abstrak: Thin film Ba0,5Sr0,5TiO3 (BST) doped with Fe2O3 was grown on p-type silicon substrate (100) using chemical solution deposition (CSD). It used the solvent 2-methoxyethanol with annealing temperature of 850°C and the doping treatment Fe2O3 of 2.5, 5, 7.5, 10 % of the mass formed BST. Pure BST had the highest absorption of 600 nm of light wavelength. Additions Fe2O3 moves highest absorption in the range of 560 nm. Fe2O3 addition was strengthening thin film sensitivity to the effects of light. In general, doping Fe2O3 10% was result the best absorbance and current-voltage of BST thin film. Electrical properties of thin films BST include dielectric, photoconductivity, and dissipation energy. Based on the current-voltage (I-V) analysis, pure BST and doped BST showed photodiode properties. Dielectric values obtained in the range from 23.32 to 243. Based on electrical conductivity data and energy dissipation, BST thin films have shown photodiode characteristics and are therefore suitable as light sensors. The image sensor in a digital camera is also a light sensor. This BST thin film has been scientifically proven to be a light sensor and also it can be applied as an image sensor. This is a novelty image sensor based on thin film Ba0.5Sr0.5TiO3.
Keyword: barium strontium titanate, thin film, photodiode, image sensor, digital camera