Judul: Optimasi Suhu Waktu Penggorengan Hampa Jamur Tiram (Pleurotus ostreatus)
Abstrak: Sejak lama jamur dikenal sebagai makanan istimewa Sebagai negara agraris dan penghasil kayu terkemuka di dunia, Indonesia banyak menghasilkan limbah yang dapat digunakan sebagai media pertumbuhan jamur. Diantara berbagai jenis jamur pangan yang ada, jamur tiram memiliki rasa yang khas dan kandungan proteinnya paling tinggi dibanding jamur lainnya. Sinergi logis dari kondisi tersebut di atas adalah mengusahakan alternatif pengolahan jamur tiram putih yang dapat meningkatkan penerimaan konsumen serta menambah nilai ekonomi produk olahannya. Karena itu pengolahan keripik jamur tiram dengan menggunakan vacuum frying, optimasi faktor-faktor yang sang at berpengaruh dalam menentukan karakteristik produk gorengan seperti suhu dan waktu menjadi penting.
Keyword: 

Judul: Model Laju Pengeringan Jamur Tiram (Pleurotus Ostreatus Var. Florida) Menggunakan Pengering Tipe Fluidized Bed Dryer
Abstrak: Jamur tiram (Pleurotus ostreatus var. florida) merupakan edible fungi yang memiliki nilai jual lebih rendah dibandingkan dengan jenis jamur lainnya. Proses pengawetan berupa pengeringan dilakukan untuk meningkatkan nilai jual dari jamur tiram dan mempermudah penanganannya baik sebagai bahan baku maupun produk. Penelitian ini dilakukan untuk membandingkan model persamaan laju pengeringan pada produk jamur tiram, mengetahui rasio rehidrasi produk jamur tiram, serta untuk mengetahui preferensi konsumen terhadap jamur tiram baik dalam keadaan kering maupun yang telah direhidrasi. Pengeringan dilakukan dengan alat fluidized bed dryer pada suhu 60±2°C dan kecepatan udara pengering yang berada pada kisaran 0.620 m/s hingga 0.839 m/s. Jamur tiram diberikan enam pretreatment sebelum dikeringkan. Model persamaan laju pengeringan yang paling sesuai menggambarkan kondisi jamur tiram selama pengeringan adalah model Lewis dibandingkan model Page. Sampel yang mendapatkan preferensi konsumen paling baik yakni sampel yang tidak diberikan pretreatment. Berdasarkan analisis rasio rehidrasi dan analisis warna, sampel yang diberikan pretreatment berupa pencucian memiliki nilai yang paling tinggi.
Keyword: jamur tiram, laju pengeringan, pretreatment, rehidrasi

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.
Keyword: