Judul: Pertumbuhan dan Produksi Kacang Bogor (Vigna subterranea (L.) Verdcourt) pada Beberapa Jarak Tanam dan Frekuensi Pembumbunan
Abstrak: This research aimed to get optimal plant spacing and proper frequency in ridging to produce the best yields. This research was conducted in randomized complete block design factorial with two factors and three replications. The first factor is plant spacing which consist of six levels: 40 cm x 25 cm, 50 cm x 25 cm, 60 cm x 25 cm, 40 cm x 40 cm, 50 cm x 50 cm, and 60 cm x 60 cm. The second factor is ridging frequencies which consist of two levels: twice and three times ridging. The result of this research showed that plant spacing effected significantly the number of leaves, canopy width, leaf area index, plant dry weight per plant, pods wet weight per plant, pods dry weight per plant, seed weight per plant, number of filled pods per plant, number of harvested plant, pods wet weight plot, pods dry weight plot, and seed weight plot, whereas ridging frequency only effected significantly on plant dry weight per plant. Plant spacing 60 cm x 25 cm and 40 cm x 40 cm produced the best yields and suitable for use in plant cultivation.
Keyword: ridging, plant spacing, bambara groundnut

Judul: Pertumbuhan dan Produksi Kacang Bogor (Vigna subterranea (L.) Verdcourt) dengan Pelbagai Dosis dan Cara Pemberian Pupuk Kandang Ayam
Abstrak: This research aimed to get optimal rate of manure and proper manure application to increase crop production of bambara groundnut. The research was conducted from February to June 2014 at IPB experimental field. The experiment used factorial in randomized complete block design with two factors and three replications. The first factor was rates of chicken manure with four i.e. 0, 5, 10, and 15 tons ha-1. The second factor was 2 application methods of manure i.e. spread over the soil surface and put in planting row. Growth and production of bambara groundnut was insignificantly affected by neither manure rates nor manure applicaton methods. Although there was not significant effect of manure rates, there was indication that the highest yield (number of pods per plant) of bambara groundnut could be achieved with the addition of 6.8 tons manure ha-1. Bambara groundnut crop were heavily infected by desease at 7 weeks after planting, this might have resulted in insignificant effect of treatments to all variables.
Keyword: crop substitution, chicken manure, legume

Judul: Elektrode Komposit Zeolit sebagai Biosensor Berbasis Tirosinase
Abstrak: Tyrosinase is a copper-containing oxidase, which catalyzes the first 2 steps in mammalian melanogenesis and responsible for enzymatic browning reactions. This study aims to develop and characterize tyrosinase biosensor of zeolite composite and its stability. The enzyme should be properly attached to the transducer for maintaining enzyme activity. Tyrosinase activity was monitored by L-DOPA as a substrate. The optimum conditions of tyrosinase activity obtained by respon optimizer were tyrosinase 50 U/mL and zeolite 150 mg/mL. Using of ferrocene as mediator and zeolite as the immobilization matrix on electrode increased the activity of tyrosinase. KMapp and Imaks app values of tyrosinase were determined by Lineweaver-Burk method, giving 6.04 mM and 6.42 mM, respectively. The electrode of zeolite as immobilizing matrix was relatively stable until 2 hours, the remaining tyrosinase activity was 87.45%
Keyword: tyrosinase inhibitor, tyrosinase-based electrode, biosensor