Judul: Analisis Keseragaman Emisi dan Desain Ulang Sub Unit Irigasi Tetes
Abstrak: Penerapan irigasi tetes di Food Estate Humbang Hasundutan berada di lahan terbuka dengan topografi bergelombang, sehingga relatif lebih sulit dalam mendesain dan konstruksi. Penelitian ini bertujuan mengkaji ulang tata letak (layout), menganalisis keseragaman emisi (emmision unifomity), mendesain ulang jaringan perpipaan sub-unit , dan menghitung estimasi biaya komponen irigasi tetes. Hasil penelitian menunjukkan tata letak (layout) meliputi jaringan utama (reservoir-box valve-riser) dengan kebutuhan debit maksimum per riser (QSU maksimum) berkisar antara 0,64 s/d 2,47 L/s. Pada jaringan irigasi terbangun telah diidentifikasi 5 petak lahan seluas 7,9 Ha yang dikaji ulang dalam penelitian ini. Keseragaman emisi (emission uniformity) berkisar antara 50,37% - 75,39%. Riser yang digunakan sebagai stasiun pengendali (control station -CS) sebanyak 10 unit. Jumlah sub-unit setelah desain ulang sebanyak 36 unit. Total panjang pipa submain dari 1096 m menjadi 1217 m, sedangkan pipa manifold dari 1006 m menjadi 1286 m. Estimasi biaya komponen yang diperlukan sebesar Rp 504.042.750 untuk skenario 1 menggunakan watermeter, sedangkan skenario 2 tanpa menggunakan watermeter sebesar Rp 390.042.750. Perencanaan tata letak pipa manifold sebaiknya tegak lurus kontur dengan kemiringan <15% dan pipa lateral searah kontur.
Keyword: design, drip irrigation, emission uniformity, sub-units, topography

Judul: Emission Uniformity Analysis and Redesign of Drip Irrigation Sub Unit for Shallot Cultivation
Abstrak: Salah satu masalah dalam penerapan irigasi tetes di Food Estate Humbang adalah kondisi lahan terbuka dengan topografi bergelombang. Penelitian ini bertujuan mengkaji ulang tata letak (layout), menganalisis keseragaman emisi (emission uniformity), mendesain ulang jaringan perpipaan sub-unit, dan menghitung estimasi biaya bahan perpipaan irigasi tetes. Hasil penelitian menunjukan kebutuhan debit maksimum per riser (QSU maksimum) pada jaringan utama (reservoir – box valve – riser) sebesar 0.79-3.52 liter/detik. Jaringan irigasi tetes terbangun pada 5 petak lahan yang diteliti seluas 7.4 Ha. Keseragaman emisi jaringan irigasi tetes berkisar 47.12-74.53%. Control station (riser) yang digunakan sebanyak 8 unit dengan total panjang pipa submain menjadi 1193 m (bertambah 369 m) dan pipa manifold menjadi 1311 m (bertambah 154 m). Estimasi biaya perpipaan irigasi tetes yang diperlukan untuk skenario 1 dengan water meter yaitu sebesar Rp 461.571.250,00 dan untuk skenario 2 tanpa water meter sebesar Rp 370.371.250,00. Penempatan pipa manifold sebaiknya tegak lurus kontur dalam batas kemiringan <15%, sedangkan penempatan pipa lateral sebaiknya searah dengan kontur agar keseragaman emisi penetes tergolong baik., One of the problems in the application of drip irrigation at the Humbang Food Estate is the condition of open land with wavy topography. This study aims to review the layout, analyze emission uniformity, redesign the sub-unit piping network, and calculate the estimated cost of drip irrigation piping. The results showed that the maximum discharge requirement per riser (maximum QSU) on the main network (reservoir – box valve – riser) was 0.79-3.52 liters/second. Drip irrigation network was built in 5 plots of land under study covering an area of 7.4 Ha. The uniformity of drip irrigation network emissions ranged from 47.12-74.53%. The control station (riser) used is 8 units with the total length of the submain pipe being 1193 m (increasing 369 m) and the manifold pipe being 1311 m (increasing 154 m). The estimated cost of drip irrigation piping required for scenario 1 with a water meter is Rp. 461,571,250.00 and for scenario 2 without a water meter it is Rp. 370,371.250.00. The placement of the manifold pipe should be perpendicular to the contour within the slope limit of <15%, while the placement of the lateral pipe should be in the direction of the contour so that the dropper emission uniformity is good.
Keyword: Design, Drip Irrigation, Emission Uniformity, Pipe, Sub-Unit

Judul: Peptides Hydrolysate Derived from Collagen of Snakehead Murrel (Channa striata) Skin Demonstrate Anti-oxidant and Anti-cholesterol Activities.
Abstrak: Anti-cholesterol and anti-oxidant play crucial role to combat cardiovascular disease (CVD) related to formation of arterial plagues from oxidation of cholesterol. In the past decades, research on bioactive peptides demonstrating anti-cholesterol and anti-oxidant activities have been reported as the alternative drugs. In this study, acid soluble collagen was extracted from the skin of snakehead murrel and employed to induce production of collagenase by Bacillus licheniformis F11.4. The collagenases secreted were in turn purified through AKTA Purifier (ion exchange, DEAE column) and used to produce peptides hydrolysate. The purified enzymes were grouped in two distinct collagenase fractions, designated as fraction D and F. Peptides hydrolysate produced by the fraction D was found to demonstrate HMG-CoA inhibitor activity comparable to pravastatin and limited anti-oxidant activity. Meanwhile, peptides hydrolysate generated using the fraction F demonstrated anti-oxidant activity comparable to BHT (2mM), vitamin C (2mM) and vitamin E (2mM), but limited HMG-CoA activity. Combination of the fraction D and F resulted in substantial HMG-CoA inhibition and anti-oxidant activities.
Keyword: Anti-cholesterol, anti-oxidant, bioactive peptide, collagen, collagenase, snakehead murrel