Produksi yang tinggi merupakan tujuan dari budidaya udang vaname (Litopenaeus vannamei) secara intensif untuk memenuhi kebutuhan pasar dan salah satu upaya untuk meningkatkan produksi adalah dengan padat tebar tinggi. Penelitian ini bertujuan untuk untuk menganalisa pertambahan bobot dan kelangsungan hidup. Penelitian ini dilakukan dengan menggunakan metode purposif (Purposive Sampling Method).  Hasil penelitian didapatkan bahwa padat tebar 170 dan 175 ekor/m2 memiliki hasil yang lebih baik diakhir pemeliharaan dilihat dari bobot rata-rata dan tingkat kelangsungan hidup yang lebih tinggi. Padat tebar 170 ekor/m2 menghasilkan bobot rata-rata 29,23 gram/ekor dan tingkat kelangsungan hidup 86,70. Padat tebar 175 ekor/m2  menghasilkan bobot rata-rata 29,18 gram/ekor dan tingkat kelangsungan hidup 82,35.

Abstract. Purnamasari I, Sobir, Syukur M. 2019. Diversity and inheritance in cowpea (Vigna unguiculata) on protein and yield components characters. Biodiversitas 20: 1294-1298.  Diallel was a method that can be used to see inheritance and diversity character of plants. The objective of this study has evaluated the inheritance and diversity of the yield component characters and seed protein content. This study used genetic material from five homozygous cowpeas (Vigna unguiculata (L.) Walp) genotypes (KM1, KM2, KM4, KM5, and TG2) and 20 F1. Genotypes were planted using a randomized complete block design with three replications. The character observed were the yield components (weight of 100 seed, number of seeds per pod, number of pods per bunch, number of pods per plant and yield) and seeds protein content. Characters that were influenced by general combining ability (GCA) consist of weight of 100 seeds, number of pods per bunch, number of seeds per pod and seed protein content. The variance of GCA has a greater value than the variance of specific combining ability (SCA). Narrow sense and broad sense heritability values were high category consist of weight 100 seed, number seeds per pod, number pods per bunch and seed protein content. That characters were inherited additively. Characters were influenced by additive gene action and have high diversity make it possible to select in F2 generation using the pedigree selection method.

Electrocoagulation is one of methods used to treat wastewater in the coal stockpile without using coagulants. Characteristics of wastewater observed are heavy metals (Fe and Mn) and pH. The decrease in the heavy metals content and the increase in the pH of this wastewater treatment process will then be proposed in the adsorption kinetics model. The influence of variations in currents and processing time were observed. The time variation of the adsorption process were 60 to 120 minutes with current variations from 1.3 to 3.0 Ampere at a fixed 12 voltages. The results obtained that the Fe content could be decreased to 0.03 ppm at 90 minutes while the content of Mn was decreased to 0.01 ppm at the same time. The increase in pH (7.11) was achieved when applying 2.5 A current at 90 minutes process time. The results obtained from the electrocoagulation method was then proposed in the model of the Langmuir isotherm adsorption kinetics and Freundlich isotherm.

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