Judul: Metil-p-Hidroksibenzoat dari Fraksi Nonpolar Ekstrak Metanol Daun Ketepeng (Cassia alata)
Abstrak: Ketepeng (Cassia alata) adalah tanaman perdu yang tumbuh berkelompok dan berguna bagi kesehatan. Daunnya secara tradisional digunakan untuk mengobati sembelit dan penyakit kulit di banyak negara seperti Indonesia. Penelitian secara khusus pada daun ketepeng belum banyak dilakukan di Indonesia, terutama mengenai informasi komponen kimia dalam daun tersebut. Dalam penelitian ini, metabolit sekunder daun ketepeng dari Tangerang, Provinsi Banten diisolasi menggunakan metode ekstraksi dan berbagai teknik kromatografi, seperti kromatografi cair vakum, kromatografi radial, dan kromatografi lapis tipis preparatif. Uji fitokimia ekstrak metanol menunjukkan kandungan senyawa steroid/triterpenoid, flavonoid, alkaloid, saponin, dan tanin. Sebanyak 4 subfraksi dari fraksi nonpolar ekstrak metanol dianalisis menggunakan spektrofotometer resonans magnet inti. Hasil analisis menunjukkan bahwa salah satu subfraksi dari fraksi n-heksana-etil asetat (8:2) merupakan senyawa metil p-hidroksibenzoat, sedangkan struktur molekul dari 3 subfraksi lainnya belum dapat ditentukan karena masih berupa campuran.
Keyword: Cassia alata, ketepeng, kromatografi, metil p-hidroksibenzoat

Judul: Komponen Kimia Fraksi Nonpolar Ekstrak Metanol Daun Trengguli (Cassia fistula)
Abstrak: Many studies have been carried out on trengguli’s leaf due to its various secondary metabolites having bioactive properties. This study covered extraction, fractionation of chemical components, and characterization of compounds contained in the isolated fractions. The extraction was done by maceration of leaves sample in methanol. Phytochemical tests on the methanol extract indicated the presence of alkaloid, flavonoid, phenolic, tannin, and steroid as the secondary metabolites. Fractionation performed by vacuum liquid chromatography method produced 7 fractions. Analysis of fraction B on thin layer chromatography (TLC) indicated a single stain in various eluents, supported by the 2-dimensional TLC and spraying with cerium sulfate results. Identification by using gas chromatograph-mass spectrometer, combined with ultraviolet-visible and Fourier transformed infrared spectrophotometer suggested that fraction B contained nonpolar compounds, including is fatty ester.
Keyword: Cassia fistula, fatty ester, trengguli leaves

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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