Judul: Potensi cendawan asal serasah tanaman hutan sebagai penghasil IAA (Indole--3-Acetic Acid) dan sebagai dekomposer
Abstrak: Silvikultur intensif merupakan salah satu program untuk mencapai hutan Indonesia sehat, prospektif dan lestari. Komponen silvikultur intensif salah satunya adalah pemanfaatan serasah tanaman hutan dan mikrobanya untuk menunjang pertumbuhan bibit tanaman. Hal tersebut dapat didukung dengan mengkaji berbagai potensi mikroba untuk meningkatkan pertumbuhan bibit tanaman. Penelitian dilakukan untuk mengkaji kemampuan cendawan yang berpotensi menghasilkan ZPT, khususnya IAA secara in vitro dan sekaligus sebagai dekomposer. Penelitian idi dilakukan dalam tiga tahap yaitu penapisan isolat berpotensi sebagai penghasil IAA, uji kemampuan isolat terpilih dalam mendegradasi selulosa dan uji kemampuan isolat terpilih dalam mendekomposisi serasak.
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Judul: Potensi konsorsium isolat bakteri dekomposer dan penghasil IAA untuk memacu pertumbuhan kacang hijau
Abstrak: The agricultural product has increased rapidly, so it affects not only agricultural waste but also agricultural byproducts, such as straw and corn leaves. The agricultural byproducts can be utilized to be organic fertilizer. It needs microorganism to make organic fertilizer through decomposition process. One of this microorganism is cellulolitic bacteria. Cellulolitic bacteria that produced IAA can be used for composting and inducing plant growth. The objective of this research is to know the ability of isolate bacteria in decomposing organic matter and synthesing IAA to induce plant growth. Miller method was used to measure the activity of cellulase enzyme and Salkowski reagent was used to measure the IAA concentration of both single and consortium bacteria. The parameters of decomposition were the percentage of final weight, the percentage of C-organic, and the percentage of N-total. Biossay qualitative method was used to identify the presence of IAA in litter. Isolate K resulted the highest activity of cellulase enzyme with using CMC substrat and also had activity in avicel and filter paper substrat. Isolate C11-1 and C11-1+H+ K resulted the highest IAA concentration. The result of decomposition showed that isolate C11-1+H+K had the lowest percentage of final dry weight. The litter that decomposed with C11-1+H tended to induce plant growth higher than others, it might that this consortium have the certain IAA concentration to induce plant height.
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Judul: Approximation of the Median of Poisson Distribution Using the Relation of Poisson-Gamma Distribution
Abstrak: A major drawback of median is that median cannot usually be defined in closed form, even in the cases where their distribution functions are known. This study gives an approximation of the closed form for the median of the Poisson distribution by using the relation of Poisson-Gamma distribution. The approximation uses elementary techniques based on the monotonicity of certain sequences involving tail probabilities of the Poisson distribution and the Central Limit Theorem. Furthermore, a closed form expression for the mean absolute deviation 􀜧|􀜰􀰒 􀵆 􀜯􀝁􀝀􁈺􀜰􀰒􁈻| is also studied. The median is relevant because of the fact that it minimizes the mean absolute deviation of a Poisson random variable (􀜰􀰒􁈻 by considering median as central tendency.
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