Judul: Isolasi dan Identifikasi Senyawa Alkaloid dalam Ekstrak Daun Sirsak Hutan (Annona glabra)
Abstrak: Sirsak hutan (Annona glabra), is a plant that has been traditionally used as medicine. In previous studies, ethanol extract of A. glabra leaves has been reported to be toxic against brine shrimp and zebrafish embryo. The result of phytochemical test showed dominant presence of alkaloids in the chloroform fraction, which was the most active fraction of the extract. This study was intended to isolate alkaloids from the chloroform fraction. The total alkaloid extract was obtained as much as 0.95 g (0.1%). Fractionation using column chromatography showed the presence of alkaloids in D fraction obtained by CHCl3-MeOH (90:10) as the eluent. This fraction exhibited 6 spots that were detected as alkaloids based on thin layer chromatography analysis with CHCl3- MeOH (85:15) eluent. Following separation of these spots on preparative thin layer chromatography, there were only 3 spots (D3; 1.1%, D4; 2.1%, and D5; 1.5%) with good separation based on ultraviolet spectrum at 254 nm. Based on spectra of liquid chromatography-mass spectrometer, Fourier transformed infrared, and ultraviolet, the D3 spot was predicted to be similar with armepavine.
Keyword: Bogor Agricultural University (IPB), isoquinoline, Annona glabra, alkaloids

Judul: Acute Toxicity Test of Active Fruit Extract from Soursop (Annona muricata) and Pond Apple (Annona glabra) as an Anticancer Potential.
Abstrak: Penelitian khasiat antikanker dari berbagai bagian tumbuhan sirsak telah marak dilakukan, namun penelitian khasiat antikanker dari bagian buah masih jarang dilakukan. Buah sirsak yang cukup banyak terdapat di Indonesia adalah buah sirsak ratu (Annona. muricata) dan buah sirsak hutan (A. glabra). Penelitian toksisitas dari buah sirsak ratu dan buah sirsak hutan dilakukan dengan dua metode, yaitu metode uji letalitas larva udang (BSLT) dan metode lebih terkini dengan menggunakan embrio ikan zebra (Danio rerio). Nilai LC50 terbaik dari ekstrak buah sirsak ratu dan sirsak hutan diberikan oleh ekstrak etil asetat baik dengan menggunakan metode BSLT maupun dengan embrio ikan zebra. Hasil pengamatan embrio ikan zebra melaporkan bahwa ekstrak etil asetat sirsak ratu merupakan ekstrak dengan daya sitotoksik tertinggi. Uji fitokimia dari ekstrak etil asetat masing-masing buah menghasilkan uji positif pada golongan senyawa alkaloid, tanin, dan flavonoid. Ekstrak etil asetat sirsak ratu menghasilkan 6 noda dari hasil pemisahan dengan kromatografi lapis tipis dan ekstrak etil asetat sirsak hutan menghasilkan 8 noda dengan cara yang sama.
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Judul: Implementasi Space Time Composite (STC) Data Model Menggunakan Model Data Relasional
Abstrak: The data model is a concept that describes the data stored in the database and the relationship between the data to the user in logic. Development of data models is very important in the design of the database as the basis of the stage of database design to be made. This study aims to apply the concept of Space Time Composite (STC) on the Model Data storage vector data types that can store enough information and describes the process of drafting objects and objects spatiotemporal evolution over time. From the results of the test queries on the data model that have been created, queries in a system are acquired that can help display the information preparation of objects from time to time and know the history of the object polygon and arc that has undergone changes in topology.
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