Judul: Kajian Produksi Bunga Kering Anggrek Dendrobium Menggunakan Metode Oven Dryer, Cabinet Dryer dan Vacuum Dryer
Abstrak: Bunga anggrek Dendrobium merupakan bunga potong yang memiliki nilai ekonomis tinggi dan sangat digemari masyarakat. Namun demikian bunga anggrek merupakan produk hortikultur yang mudah rusak, karena itu umur keragaannya relatif pendek. Oleh sebab itu dibutuhkan kegiatan pasca panen untuk mengawetkan bunga potong, yang salah satunya adalah dengan metode pengeringan. Metode pengeringan dapat dilakukan dengan menggunakan pengering oven, cabinet dan vacuum untuk menurunkan kadar air agar bunga lebih tahan lama.
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Judul: Kajian Suhu dan Lama Pengeringan Bunga Anggrek Menggunakan Freeze Dryer.
Abstrak: Usaha bunga potong saat ini banyak disukai sehingga diperkirakan mempunyai prospek yang baik terutama sebagai komoditas ekspor. Hilangnya kesegaran bunga pada masa keragaan menjadi kendala utama perdagangan bunga potong, sehingga perlu dilakukan kegiatan pasca panen untuk mengawetkan bunga potong. Pengeringan adalah salah satu usaha mengawetkan produk pertanian yang mudah rusak karena kandungan air yang tinggi, seperti bunga potong. Agar bunga yang dikeringkan tidak mengalami kerusakan, maka metode pengeringan yang paling memungkinkan untuk digunakan adalah pengeringan beku. Pengeringan beku bekerja menggnnakan prinsip sublimasi, sehingga bahan yang dikeringkan tidak rusak, mempunyai wama, tekstur, penampakan yang baik, mendekati penampakan awalnya.
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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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