Judul: Analisis Inhibisi Enzim α-Glukosidase dan Sitotoksisitas Ekstrak Air-Etanol Benalu Jeruk (Loranthus spp.)
Abstrak: Loranthus spp. is a plant parasite belonging to the Loranthaceae tribes that live attached to the citrus plants (Citrus spp.). This study aimed to examine antidiabetic activity and cytotoxicity of Loranthus spp. with the variation of solvent extraction of water and ethanol. Antidiabetic activity of the extracts was tested by the method of inhibition against α-glucosidase enzyme activity and using acarbose as a positive control. Cytotoxicity of Loranthus spp. extracts was conducted by BSLT (Brine Shrimp Lethality Test). Extraction of Loranthus spp. carried by maceration with water solvent, 30% ethanol, 70% and 96%. Inhibition of α-glucosidase enzyme extract water, ethanol 30%, 70%, and 96% had IC50 values, respectively for 3488, 180, 65.15, and 70.71 ppm. IC50 values for acarbose as a comparison is 0.04 ppm. The test results in 70% and 96% ethanol extract showed Loranthus spp. have an antidiabetic. Toxicity testing of water extract, ethanol 30%, 70%, and 96% gain in a row LC50 value of 699.92; 648.15; 864.60, and 978.85 ppm. Toxicity test results showed all the extracts are toxic because it had LC50 values were included in the class according to the degree of toxicity.
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Judul: Aktivitas Inhibisi Enzim α-Glukosidase dan Toksisitas Ekstrak Air dan Ekstrak Etanol Daun Sengon (Paraserianthes falcataria (L) Nielsen)
Abstrak: Paraserianthes falcataria (L) Nielsen has been shown to have a high bioactivity. Utilization of sengon leaf as a antidiabetic has not been done. This study aims to examine the antidiabetic activity and toxicity of water and ethanol extracts of the sengon leaves. Antidiabetic activity of the extracts was tested by the method of inhibition against α-glucosidase enzyme. Cytotoxicity of Paraserianthes falcataria (L) Nielsen. extracts was conducted by BSLT. Extraction of Paraserianthes falcataria (L) Nielsen. Inhibition of α-glucosidase enzyme extract water, ethanol 70%, and 96% had IC50 values, respectively for 1541.667 and 1213.090 ppm, the IC50 of water extract could not be calculatet because its inhibition activity is less than 50%. IC50 values for acarbose as a comparison is 0.311 ppm. The test results in 70% and 96% ethanol extract showed Paraserianthes falcataria (L) Nielsen. not have an antidiabetic. Toxicity testing of water extract, ethanol 70%, and 96% gain in a row LC50 value of of 499 677 , 373 342 and 383 270 ppm. Means that all the tested extracts are toxic.
Keyword: Bogor Agricultural University (IPB), Totoxicity, Inhibition, α-Glucosidase, Sengon

Judul: Simulasi persamaan keadaan bintang dengan pendekatan klasik dan relativistik
Abstrak: Komposisi bintang yang selalu berubah akanmempengaruhi massa dan radius bintang itu sendiri. Dimana semakin tua sebuah bintang, maka bintang akan didominasi oleh unsur-unsur berat. Dengan persamaan politrop dan metode Runge-Kutta orde 4 didapatkan radius dan massa bintang semakin berkurang seiring berkurangnya nilai Ye, sedangkan kerapatan semakin meningkat. Pendekatan terbaik terdapat pada nilai Ye sebesar 0.5 dimana didapatkan bahwa massa bintang katai putih sebesar 1.4Mo sesuai dengan massa Chandrasekhar dengan radius bintang 5000 km dan nilai kerapatan bintang sebesar 5.31x 106 g cm-3. Untuk massa bintang neutron diperoleh nilai 0.05Modan radius bintang sebesar 2300 km, sedangkan kerapatannya bintang neutron diperoleh sebesar 1.84 x 107 g cm-3 dengan menggunakan pendekatan relativistic. Pendekatan relativistic terbukti lebih baik untuk menentukan radius dan massa bintang, dengan pendekatan terbaik pada nilai Ye sebesar 0.5 yaitu pada bintang katai putih
Keyword: Composition of the stars, density of the stars, mass of the stars, radii of the stars