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: Transisi Fasa Materi Hadronik ke Materi Kuark pada Inti Bintang Neutron.
Abstrak: Bintang neutron terdiri dari beberapa lapisan yang disusun oleh materi nuklir yang berbeda dengan kerapatan yang semakin tinggi ketika mendekati pusat bintang. Inti luar bintang neutron disusun oleh materi hadronik (nukleon, lepton, dan hyperon), sedangkan inti dalam bintang neutron disusun oleh kuark-kuark bebas (up, down, strange) yang saling berinteraksi. Tujuan penelitian ini adalah mempelajari bagaimana transisi dari inti luar ke inti dalam bintang neutron dengan menggunakan pendekatan RMF (Relativistic Mean Field) untuk materi hadronik dan CIDDM (Confined Isospin Density Dependent Mass) untuk materi kuark. Tekanan transisi diperoleh ketika potensial kimia barion materi hadronik dan materi kuark bernilai sama. Nilai tekanan transisi dengan parameter SU6-TM1 sekitar 87 MeV/fm3 dan diperoleh massa maksimum bintang neutron yaitu 1.92M dengan jari-jari sekitar 8.62 km. Nilai tekanan transisi dengan parameter SU6-G2 sekitar 53 MeV/fm3 dan massa maksimum bintang neutron yaitu 1.88M dengan jari-jari sekitar 8.16 km. Jenis transisi fasa adalah orde satu ditandai dengan diskontinuitas dalam kerapatan energi (adanya mixed phase). Parameter-parameter pada model nuklir yang digunakan menyebabkan perbedaan kekakuan persamaan keadaan (EOS) dari materi hadronik dan materi kuark sehingga nilai tekanan transisi dari fasa hadronik ke fasa kuark juga berbeda.
Keyword: bintang neutron, persamaan keadaan, transisi fasa