Judul: Seleksi Genotipe Ekstrak Etanol Rimpang Temulawak (Curcuma xanthorrhiza Roxb.) berdasarkan Kandungan dan Aktivitas Senyawa Bioaktif.
Abstrak: Temulawak adalah tanaman herbal yang termasuk dalam famili Zingiberaceae. Temulawak dapat dikembangkan potensinya berdasarkan stabilitas genotipenya. Penelitian ini bertujuan menyeleksi 6 genotipe dengan penanaman multilokasi (Cianjur, Sukabumi, dan Bogor) berdasarkan parameter aktivitas antioksidan, kadar total fenolik, dan kadar total flavonoid. Sampel temulawak diekstraksi menggunakan etanol 96%. Aktivitas antioksidan diukur dengan metode DPPH dan FRAP. Genotipe yang stabil pada pengujian DPPH adalah G2, G3, dan G6, sedangkan metode FRAP adalah G2, G3, G5, dan G6. Kadar total fenolik diuji menggunakan metode Folin-Ciocalteu. Genotipe yang stabil pada uji kadar total fenolik adalah G3, G5, dan G6. Pengujian kadar total flavonoid dilakukan dengan metode AlCl3. Genotipe yang stabil pada parameter kadar total flavonoid adalah G1, G3, dan G6. Genotipe yang stabil di tiap lokasi pada semua parameter uji adalah G3 dan G6.
Keyword: antioksidan, fenolik, flavonoid, stabilitas genotipe, temulawak

Judul: Interaction of Genotype and Environment on The Phenolic Levels and Antioxidant Activity of Temulawak (Curcuma xanthorrhiza Roxb.)
Abstrak: Rimpang temulawak (Curcuma xanthorrhiza Roxb.) memiliki potensi sebagai sumber antioksidan karena terdapat senyawa bioaktif metabolit sekunder seperti senyawa fenolik. Perbedaan kondisi abiotik lingkungan, seperti air dan suhu, menyebabkan cekaman pada tanaman dan akan terbentuk variasi akumulasi metabolit sekunder tanaman. Penelitian ini bertujuan mengevaluasi produktivitas kadar fenolik dan aktivitas antioksidan serta mendapatkan informasi mengenai stabilitas genotipe rimpang temulawak pada kadar fenolik dan aktivitas antioksidan terhadap penanaman di tiga lokasi (Bogor, Cianjur, Sukabumi). Tahapan penelitian meliputi pengujian kadar fenolik dan aktivitas antioksidan metode DPPH serta daya adaptasi genotipe temulawak pada penanaman multilokasi dengan metode AMMI. Produktivitas kadar fenolik tertinggi diperoleh dari lokasi Sukabumi (7,8744 mg GAE/g), dan genotipe G5 (7,5394 mg GAE/g), sedangkan aktivitas antioksidan tertinggi diperoleh dari lokasi Cianjur (20,1519 μmol TE/g), dan genotipe G6 (21,1797 μmol TE/g). Keragaman lokasi berpengaruh nyata pada kadar fenolik, serta tidak terdapat interaksi genotipe dan lingkungan pada kedua parameter. Genotipe yang stabil pada ketiga lokasi adalah G2 untuk kadar fenolik, G3 dan G4 untuk aktivitas antioksidan, G1 dan G6 untuk kedua parameter, sementara G4 berpotensi stabil di Bogor untuk kadar fenolik., Temulawak rhizomes (Curcuma xanthorrhiza Roxb.) have the potentials as antioxidant sources because they contain bioactive secondary metabolites such as phenolics. Differences in environmental abiotic factors, such as water and temperature, cause stress on plants and will create variations in the secondary metabolites’ accumulations. This research aims to evaluate the phenolic levels productivity and antioxidant activity and to obtain information about the stability of temulawak rhizome genotypes on phenolic content and antioxidant activity on planting in three locations (Bogor, Cianjur, Sukabumi). The research stages included the phenolic content and antioxidant activity (DPPH method) test, as well as the adaptability of the temulawak genotype in multilocation planting using the AMMI method. The highest phenolic content productivity was obtained from Sukabumi (7.8744 mg GAE/g), and G5 (7.5394 mg GAE/g), while the highest antioxidant activity was obtained from Cianjur (20.1519 μmol TE/g), and G6 (21.1797 μmol TE/g). Location diversity has a significant effect on phenolic levels, and there is no interaction of genotype and environment on both parameters. The stable genotypes at all three locations were G2 for phenolic content, G3 and G4 for antioxidant activity, G1 and G6 for both parameters, while G4 was potentially stable only in Bogor for phenolic content.
Keyword: antioxidant, Curcuma xanthorrhiza, genotype, phenolics, stability

Judul: Sectoral Effects Of Monetary Policy
Abstrak: The purposes of this study are three folds: (1) identifying which channels are effective for transmission of monetary policy; (2) assessing whether the transmission mechanisms at industry level are consistent with that at aggregate level; and (3) explaining why and how a channel becomes effective. The analyses are facilitated impulse response function (IRF) derived from a vector autoregression (VAR) model. Three channels are identified in this study: interest rate, real credits and exchange rate channels. The IRF results show that exchange rate is the only effective channel in affecting aggregate output and at least in five industries (the manufacturing industry; the construction industry; the trade, hotel, and restaurants industry; the transport and communication industry; and the finance, real estate, and business services industry). Meanwhile, the other two channels are not effective at aggregate and all industry. This finding suggests that there is some form of consistency between aggregate effects and industry effects. Moreover, the effect of real depreciation tend to be contractionary and thus supporting the idea of Krugman and Taylor (1976) among others. Output contraction seems to be associated with inflationary effect of the depreciation. This is a truly Keynesian type demand side story: following a real currency depreciation, purchasing power tends to weaken which then soaks the aggregate demand.
Keyword: transmission of monetary policy, industry level, IRF