Millettia pinnata (L.) Panigrahi is a potential legume tree that produces seed oil for biodiesel feedstock. The initial step for raising a large-scale plantation of the species is selection of high oil yielding trees from the natural habitat. This is followed by vegetative propagation of the selected trees and then testing the growth of the clone in the field.The aim of the present study was to select high-oil yielding trees of M. pinnata, to propagate the selected trees by budding and to evaluate the survival and growth of budded plants in the field. Pods were collected from 30 trees in Lovina Beach, Buleleng Regency, Bali. Oil was extracted from seeds using soxhlet with hexane as a solvent. The high oil yielding trees were propagated by budding using root stocks grown from M. pinnata seeds. Scions were taken from young branches of selected trees. Incision was made on rootstock and the same size of cut was made on a scion containing a single bud. The scion was inserted to the incision of rootstock then closed tightly using plastic strips. The plastic was removed when the scion grew into a little green shoot. One month after plastic removal, the scion union grew into a single shoot and then the budded plants were removed to polybags. Budded plants were planted in the field of Bukit Jimbaran, Badung Regency, Bali with 4 × 4 spacing. Results showed all budded plants successfully grow new shoots. Two months after planting the survival of budded plants was 100%. Plant height increased by 22.13 cm, stem diameter increased by 2.43 mm and the number of compound leaf increased by 2.08. It can be concluded that four high oil yielding trees were selected from Lovina Beach and successfully propagated by budding. Survival of budded plants was 100% with vigorous growth.

This research was on the synthesis of cellulose composites from camphor wood sawdust with LDPE waste (cellulose-LDPE) and Fenton reagent (H2O2/Fe2+) as the coupling agent. This study was divided into three steps: preparation, variation of LDPE composition and H2O2 concentration, and characterization. Preparation was done with cellulose extraction of sawdust and LDPE plastic waste purification. Variation was performed to determine the effect of compositions of LDPE on composites celullose-LDPE and H2O2 concentration on Fenton reagent. Characterization was done by testing the physical properties and functional groups using FTIR analysis. The best values of the physical property were obtained from cellulose-LDPE composition ratio of 1:5 on 1.5% H2O2. These were MOE (Modulus of Elasticity) of 12.71 MPa, MOR (Modulus of Rupture) of 200.24 MPa and density of 0.7936 g/cm. FTIR analysis showed the higher the composition of LDPE, the higher the wavenumber for OH and the increase of H2O2 concentration increased the C-H wavenumber functional groups.

Antioksidan merupakan suatu senyawa yang mampu menangkal atau meredam efek negatif oksidan dalam tubuh. Daun nangka (Artocarpus heterophyllus Lam.) dapat digunakan sebagai antioksidan alami karena mengandung metabolit sekunder. Penelitian ini bertujuan untuk mengetahui potensi ekstrak daun nangka yang dapat digunakan sebagai antioksidan alami. Ekstraksi serbuk kering daun nangka dilakukan dengan metode maserasi menggunakan pelarut n-heksana, etil asetat dan etanol, sedangkan uji aktivitas antioksidan dilakukan menggunakan metode difenilpikril hidrazil. Ekstraksi 1000 gram serbuk daun nangka kering menghasilkan ekstrak kental n-heksana yang berwarna hijau sebanyak 19,60 gram, ekstrak etil asetat yang berwarna hijau kecoklatan sebanyak 21,04 gram dan ekstrak etanol yang berwarna coklat sebanyak 24,76 gram. Uji fitokimia menunjukkan bahwa ekstrak n-heksana, etil asetat dan etanol positif terdapat senyawa flavonoid. Total flavonoid pada ekstrak n-heksana 18,07 mg/100gr QE, ekstrak etil asetat 249,94 mg/100gr QE dan ekstrak etanol 422,90 mg/100gr QE. Hasil uji aktivitas antioksidan pada ekstrak n-heksana memiliki nilai IC50 sebesar 35,57 ppm, ekstrak etil asetat memiliki nilai IC50 sebesar 48,48 ppm dan ekstrak etanol memiliki nilai IC50 sebesar 12,65 ppm. Hasil ini menunjukkan bahwa ekstrak etanol memiliki aktivitas antioksidan paling kuat dan siap dikembangkan sebagai alternatif antioksidan alami.

The adsorption characteristics of chromium ions in chrome electroplating wastewater on low cost adsorbent have been conducted. Adsorbent was prepared from bovine bone waste of NaOH activated at various concentrations (0.2 to 0.8 M). Its adsorption such as adsorption isotherms and adsorption thermodynamics as well as adsorbent physico-chemical characteristics (surface active sites, crystallinity and crystal size, surface morphology and elementals composition). The result showed that amount of adsorbent surface active sites increased because of NaOH activated, the highest at 0.4 M NaOH concentration (AT0.4 adsorbent). X-ray diffraction patterns of the adsorbents showed a wide peaks and crystal size as nanocrystalline. The surface morfology was stack of aglomerates and leached of Ca and Mg due to increase Na. The adsorption result of adsorbents to chromium ions showed that the highest adsorption ability on AT0.4 adsorbent. It was suitable for Freundlich adsorption isotherm model as physical adsorption and endothermic but the tendency to be spontaneous process.

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