Judul: Pemanfaatan dan Pengawetan Uwi Kelapa (Dioscorea alata L.) Sebagai Enyek-Enyek Serta Daya Terimanya
Abstrak: Tujuan penelitian ini adalah untuk mempelajari kemungkinan pemanfaatan uwi kelapa (Dioscorea alata L.) sebagai enyek-enyek. Enyek-enyek adalah sejenis bahan pangan kerupuk berasal dari bahan umbi-umbian singkong, yang dibuat melalui proses pengeringan.
Keyword: uwi kelapa

Judul: Kajian Esktrak Umbi Gadung (Dioscorea hispida), Biji Rerak (Sapindus rarak) dan Biji Sirsak (Annona muricata L.) sebagai bahan Pengawet Alami Kayu
Abstrak: Kayu sangat bermanfaat bagi kehidupan yaitu untuk bahan bangunan, jembatan, furniture, alat rumah tangga, kertas, alat musik dan sebagainya. Manfaat tersebut diiringi oleh kebutuhan msyarakat akan kayu olahan yang semakin meningkat, sedangkan kayu yang berkualitas dengan keawetan alami tinggi semakin terbatas dan memiliki harga yang cukup mahal. Sehingga masyarakat cenderung menggunakan kayu dengan kelas awet rendah, karena harganya lebih terjangkau walaupun umur pakainya lebih pendek. Dalam mengatasi hal tersebut maka perlu dilakukan pengawetan pada kayu dengan kelas awet rendah agar umur pakainya lebih lama. Penelitian ini bertujuan untuk mengetahui pengaruh zat ekstraktif umbi gadung (Discorea hipida), biji sirsak (annona muricat L.) dan biji rerak (Sapindus rarak) yang larut dalam n-heksan, etil asetat, aseton adn metanol terhadap serangan rayap Coptotermes sp. Menentukan konsentrasi optimal bahan terbaik yang mampu digunakan sebagai bahan pengawet alami
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Judul: Quantitative Trait Loci Mapping for Trait in Categorical Scale
Abstrak: Genes or regions on chromosome underlying a quantitative trait are called Quantitative Trait Loci (QTL). Characterizing genes controlling quantitative trait on their position in chromosome and their effect on trait is through a process called QTL mapping. In estimating the QTL position and its effect, QTL mapping basically utilize the association between QTL and DNA markers. However, many important traits are obtained in categorical scale, such as resistance from certain disease. From a theoretical point of view, QTL mapping method assuming continuous trait could not be applied to categorical trait. This research was focusing on the assessment of the performance of Maximum Likelihood (ML) and Regression (REG) approach employed in QTL mapping as well as the performance of Lander and Botstein (LB) and Piepho method in determining critical value in testing the existence of QTL for binary and ordinal trait by means of simulation study. The simulation study to evaluate the performance of ML and REG approach was conducted by taking into account several factors that may affecting the performance of both approaches. The factors are: (1) marker density; (2) QTL effect; (3) sample size; (4) shape of phenotypic distribution; (5) number of categories; and (6) number of QTL. Moreover, the simulation study for evaluating LB and Piepho method in determining critical value was conducted by generating distribution of the test statistic under null hypothesis. From simulation study, it was obtained that LB and Piepho method showing similar performance in determining critical value in testing the existence of QTL for binary and ordinal trait. The simulation study also indicating that both methods could be used in determining critical value in QTL mapping analysis for binary trait as well as for ordinal trait if the REG approach is used but not if ML approach is used due to their poor performance. In assessing the performance of ML and REG approach in QTL mapping analysis for binary trait, the two approaches showing comparable performance; whereas for ordinal trait REG approach showing poor performance compared with ML approach in estimating thresholds. As a result, in QTL mapping analysis, ML and REG approach could be used when dealing with binary trait, whereas ML approach is suggested when dealing with ordinal trait.
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