Judul: Kadar Total Senyawa Fenolik, Flavonoid, dan Aktivitas Antioksidan Ekstrak Air dan Ekstrak Metanol Daun Singkong (Manihot esculenta Crantz)
Abstrak: Manihot esculenta Crantz or cassava is a plant that has been known, but their leaves utilization is still limited as animal feed additives. Cassava leaves contain mineral such as Fe, Zn, Mn, Cu, Mg, Ca, P, K, S, contain crude protein, β- carotene and have an active compound of flavonoids, phenolic, and contain chlorophyll which is a natural antioxidant. The purpose of this study were to determine the levels of total phenolics, flavonoids, and antioxidant activity of the water extracts and methanol extracts of simplicia and boiled cassava leaves in vitro. Cassava leaves extraction was done by maceration method to obtain the methanol extract and infundation method to get the water extract. Based on phytochemical test, cassava leaves contain alkaloids, flavonoids, phenolic, tannins, and saponins. The highest levels of total phenolics and flavonoids contained in the methanol extract of simplicia, 30.57 mg GAE/g and 881.33 mg RE/g. Cassava leaves extract has potential as an antioxidant with the highest inhibition of DPPH radicals produced by the methanol extract of simplicia which have IC50 values of 92.10 mg/L and followed by methanol extract of boiled leaves, water extract of simplicia, and water extract of boiled leaves
Keyword: Bogor Agricultural University (IPB), phenolics., flavonoids, DPPH, cassava leaves, antioxidant

Judul: Nutrient Composition and Cyanide Acid Content in Cassava Leaves (Manihot Esculenta Crantz) as Forage
Abstrak: Penelitian ini bertujuan menganalisis komposisi nutrien dan kandungan asam sianida daun singkong mentega (Manihot esculenta Crantz) sebagai hijauan pakan pada umur tanaman dan bagian daun yang berbeda. Penelitian menggunakan rancangan acak lengkap (RAL) faktorial dengan 2 perlakuan dan 3 ulangan dengan faktor (1) bagian daun (pucuk, tengah, dan bawah) dan (2) umur (3 bulan, 4 bulan, dan 5 bulan). Peubah yang diamati yaitu kandungan bahan kering (BK), abu, protein kasar (BK), lemak kasar (LK), serat kasar (SK), bahan ekstrak tanpa nitrogen (BETN), total digestible nutrient (TDN), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemiselulosa, dan asam sianida (HCN). Data dianalisis menggunakan analisis sidik ragam (ANOVA), apabila berbeda nyata dilakukan uji lanjut duncan. Hasil penelitian menunjukan adanya interaksi bagian daun dan umur tanaman terhadap kandungan BK, abu, SK, dan HCN. Berdasarkan bagian berpengaruh nyata (P, This study aimed to analyze the nutrient composition and cyanide acid in cassava leaves (Manihot esculenta Crantz) as forage across varying plant ages and leaf segments. Using a complete random design (CRD), the research comprised 2 treatments with 3 replications each. (1) leaf segments (top, middle, and bottom) and (2) plant ages (3 months, 4 months, and 5 months). The parameters included dry matter(DM), ash, crude protein (CP), ether extract (EE), crude fiber(CF), nitrogen free extract (NFE), total digestible nutrient (TDN), neutral detergent fiber (NDF), acid detergent fiber (ADF), hemicellulose, and cyanide acid (HCN) concentration. Data were analyzed using analysis of variance (ANOVA), and the significant different was assessed by Duncan test. The results showed interactions between leaf parts and plant age on the content of DM, ash, EE and HCN. Based on the section, it significantly (P<0,05) decreased PK and increased BETN, NDF and ADF. The conclusion of this study is that the parts and age of cassava leaf plants have an influence on nutrient composition and HCN.
Keyword: cassava leaf, cyanide acid, leaf parts, plant age

Judul: Implementation of Spatio-Temporal Change Query in Relational Database.
Abstrak: Geographic object changes in various views. Object changes are recorded using a model of static storage. No historical connection between old version data and new version data has been built. For that, a storage model of spatio-temporal queries that can analyze spatio-temporal changes has been developed. The object changes the geometry are grouped according to the taxonomy of Spatio-Temporal Pattern Change. This research has been able to apply the query patterns change including born, expand, merge, contract, split, normal and die. This query based on geometric (area) changes. The implementation of spatio-temporal change queries represents an object changes continuously with easy, change detection is done by comparing two versions of data. Keyword: spatio-temporal change query, spatio-temporal change pattern.
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