Judul: Morphophysiological and Anatomical  Responses of Sun and Shade Plants to Sunlight Intensity Stress
Abstrak: Setiap tumbuhan mempunyai kebutuhan intensitas cahaya tertentu. Apabila tumbuhan menerima intensitas cahaya yang tidak sesuai dengan kebutuhannya, akan menyebabkan pertumbuhan dan perkembangan yang berbeda. Tujuan penelitian ini adalah untuk mengetahui perbedaan ciri morfologi, fisiologi, dan anatomi tanaman suka sinar matahari (Catharanthus roseus) dan suka teduhan (Spathiphyllum sp.) yang ditanam pada berbagai tingkat intensitas cahaya, yakni naungan 0% (sinar matahari penuh), 50% dan 95%. Tanaman dinaungi menggunakan paranet berkerapatan berbeda di Kebun Percobaan Leuwikopo, Kampus Dramaga, IPB University. Analisis fotosintesis dilakukan menggunakan Li-6400 portable photosynthesis system dengan Photosynthetic Photon Flux Density (PPFD) 2000, 800 dan 50 µmol/m/s. Biomassa terbesar terjadi pada naungan 50% untuk kedua jenis tanaman, dan menurun pada naungan yang lebih tinggi pada tapak dara, dan kondisi sinar matahari penuh pada peace lily. Kandungan klorofil, luas, dan sudut daun meningkat seiring dengan penambahan naungan. Perlakuan naungan tidak berpengaruh nyata terhadap kadar air total kedua jenis tanaman. Asimilasi CO2 (Pn) terbaik terukur dengan PPFD 800 dan 2000 µmol/m/s, pada tanaman naungan 50%, meskipun tidak berbeda nyata dengan tanaman naungan 0% dan 95%. Hal ini menunjukkan perlakuan naungan tidak menyebabkan kerusakan perangkat fotosintesis. Struktur jaringan daun terbaik (rapat) dimiliki tapak dara naungan 0% dan peace lily naungan 95%., Plant species have certain requirement for light intensity, therefore if plants receive inappropriate light intensity, it will cause adverse growth and development. The aim of this research was to observe differences in the morphological, physiological, and anatomical characteristics of sun plant periwinkle (Catharanthus roseus) and shade plant Spathiphyllum sp. grown at different levels of light intensity, i.e., 0% shade (full sunlight), 50% shade, and 95% shade. Light intensity treatment was provided by placing the plants under para-net with different density in Leuwikopo Experimental Garden, Dramaga Campus, IPB University. Photosynthesis analysis was carried out using the Li-6400 portable photosynthesis system, with Photosynthetic Photon Flux Density (PPFD) adjusted at 2000, 800 and 50 µmol/m/s. The largest biomass resulted in 50% shade for both types of plants, which decreased significantly by higher shading for periwinkle, while for peace lily it decreased under full sunlight. Chlorophyll content, leaf area and leaf angle increased with the intensed shade density. Shading treatment had no significant effect on total water content of both plant species. The best photosynthetic CO2 assimilation (Pn) measured with PPFD 800 and 2000 µmol/m/s occurred in the plants treated with 50% shading, even though not significantly different with the plants without shading and with 95% shading, suggesting that shading treatments did not cause the damage of photosynthetic apparatus. The most compact anatomical structure was shown by the periwinkle with 0% shading and the peace lily with 95% shading.
Keyword: Catharanthus roseus, chlorophyll, photosynthesis, shade, Spathiphyllum sp

Judul: Kecapi Seedlings (Sandoricum koetjape Merr.) Growth Response Under Different Spectrum and Intensities of Light Emitting Diode
Abstrak: Kecapi (Sandoricum koetjape Merr.) merupakan buah lokal dari famili Meliaceae yang sudah jarang dibudidayakan. Harga pasar buah ini tidak stabil akibat produksi dan kualitas tidak konsisten. Untuk memperbaiki sistem budidaya tanaman buah ini dapat dilakukan dengan modifikasi lingkungan yaitu penggunaan LED (Light Emitting Diode) sebagai cahaya buatan. Penelitian ini bertujuan mengetahui perubahan respons morfologi, fisiologi, dan anatomi terhadap perbedaan spektrum dan tingkat intensitas cahaya LED. Penelitian dilaksanakanberdasarkan Rancangan Acak Lengkap (RAL) dua faktor terdiri dari spektrum LED (ungu dan putih) dan intensitas cahaya (dua dan empat lampu). Hasil penelitian menunjukkan respons morfologi dan fisiologi terbaik pada perlakuan LED putih intensitas tinggi (WH). LED putih intensitas rendah (WL) meningkatkan kandungan klorofil daun dan laju fotosintesis. Respons anatomi terbaik pada perlakuan LED ungu intensitas rendah (PL). Peningkatan lebar daun pada LED ungu intensitas tinggi (PH). Kandungan glukosa menurun pada semua perlakuan dan peningkatan kandungan fruktosa hanya terjadi pada perlakuan LED ungu dengan intensitas rendah., Kecapi (Sandoricum koetjape Merr.) is a local fruit from the Meliaceae family that is rarely cultivated. The market price of this fruit is unstable due to inconsistent production and quality. Improving the cultivation system of this fruit plant can be done by modifying the environment, the use of LED (Light Emitting Diode) as artificial light. This study aims to determine changes in morphological, physiological, and anatomical responses to different spectra and intensity levels of the LED light. The research was conducted based on a two-factor completely randomized design (CRD) consisting of LED spectrum (purple and white) and light intensity (two and four lights). The results showed the best morphological and physiological responses in the treatment of high-intensity white LED (WH). Low-intensity white LED (WL) increased leaf chlorophyll content and photosynthesis rate. The best anatomical response was in the low-intensity purple LED (PL) treatment. Increased leaf width in high-intensity purple LED (PH). Leaf glucose content decreased in all treatments and an increase in fructose content only occurred in the low-intensity purple LED treatment.
Keyword: chlorophyll, glucose, intracellular CO2, photosynthesis, stomata

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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