Judul: Potensi Antikanker Ekstrak Daun Sirih Merah (Piper crocatum) terhadap Sel HeLa
Abstrak: Cervical cancer is the most common death cause of cancer in Indonesian after human breast cancer. One of the efforts of cancer treatment is the utilization of natural materials compounds. Some plants have potential as anticancer for example leaves of Piper crocatum. Base of previous study methanol extract Piper crocatum has IC50 values 44.25 μg/mL on breast cancer cells (T47D). The purpose of this study was to determine inhibition activity of Piper crocatum ethanol, waters extract and Piper crocatum leaves powder against HeLa and Chang cells by Microculture Tetrazolium Technique (MTT) assay. The result showed that Piper crocatum leaves powder has higher inhibition with value 86% at 800 ppm which was higher than water and ethanol 30% with % inhibition 46% at 800ppm and 39% at 400 ppm.
Keyword: Piper crocatum, HeLa cells lines, MTT, inhibition, cervical cancer

Judul: Red Betel Leaf Extract and Fraction as In Silico ERα Inhibitor and Anticancer MCF-7 Cells In Vitro
Abstrak: Penyakit kanker merupakan salah satu penyebab kematian utama di dunia. Berdasarkan data global, kanker payudara menempati urutan pertama kasus baru dan urutan kelima kematian akibat kanker payudara. Tamoixifen adalah golongan obat modulator reseptor estrogen selektif (selective estrogen-receptor modulator/SERM) dan bekerja dengan mengurangi pertumbuhan sel kanker payudara. Efek samping tamoxifen timbul karena sifat selektif reseptor obat ini. Suatu jaringan bersifat antagonis estrogen, sementara jaringan lain agonis estrogen. Salah satu tanaman herbal yang telah terbukti memiliki aktivitas sebagai antikanker adalah sirih merah (Piper crocatum Ruiz & Pav.). Ekstrak etanol dan 3 fraksi (fraksi n-heksan, fraksi etil asetat dan fraksi air) daun sirih merah diketahui memiliki aktivitas antikanker dan antiokasidan yang baik. Penelitian ini bertujuan mendapatkan senyawa bioaktif daun sirih merah yang berpotensi untuk menghambat inhibitor reseptor ERα secara in silico. Selain itu, penelitian ini juga untuk mendapatkan ekstrak atau fraksi yang terbaik serta menentukan potensi daun sirih merah terhadap sitotoksisitas kanker payudara sel MCF-7 secara in vitro. Metode yang digunakan untuk in silico yaitu webserver Pubchem digunakan untuk memperoleh senyawa bioaktif, webserver admetSar1 digunakan untuk bioavailibilitas ligan, webserver Lipinski digunakan untuk toksisitas ligan serta aplikasi yassara structure digunakan untuk preparasi ligan dan reseptor, validasi gridbox dan penapisan virtual. Metode secara in vitro terdiri dari ekstraksi, fraksinasi bertingkat dan antikanker menggunakan Elisa Microplate Reader. Hasil uji in silico menunjukkan bahwa senyawa bioaktif yang berperan dalam menghambat reseptor ERα adalah 2-(4-Hydroxyphenyl)-2-phenyl-N(3,3-diphenylpropyl)-acetamide dengan konstanta inhibisi sebesar 2.82 x 10-8 µM dan energi bebas gibbs sebesar – 10.2880 Kal/mol. Hasil uji in vitro menunjukkan nilai IC 50 terbaik diperoleh dari fraksi n-heksan pada konsentrasi 500 ppm sebesar 73.42%. Simpulan penelitian ini menunjukkan bahwa senyawa bioaktif daun sirih merah terbukti memiliki aktivitas sitotoksik terhadap antikanker payudara sel MCF-7.
Keyword: 3ERT, Breast Cancer, Molecular Docking, MTT, Piper crocatum

Judul: Dynamic New Keynesian Model for Unemployment and Inflation Rate.
Abstrak: This paper deals with a scientific analysis of the equilibrium level of hiring, employment and unemployment. The basic model being used is a standard new Keynesian model, which states that utility function depends on consumptions and working hours. Utility maximization refers to a standard labour supply equation, with the marginal cost’s dynamics on new Keynesian model simply reflects movements in real wages and productivity. Furthermore, trade-off between output and inflation stabilization can be considered using the new Keynesian Phillips curve. Dynamic general equilibrium model is a model that can be used to study interactions between market imperfections and nominal rigidities, which is capable of overcoming the main shortcoming of the standard new Keynesian model. In the general equilibrium model there are three groups of the economy agents, namely households, firms and monetary authority. The results of this research science that bargaining processes between firms and workers will yield optimal wage. Increase in labour will cause wages to fall, but the unemployment rate can be reduced. An increase in the firm’s monopoly power will shift the labour demand curve downward, which will reduce the number of workers that firm is willing to hire for any given bargained wage.
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