Judul: Genetic analysis and inheritance studies of resistance to anthracnose
Abstrak: Pepper anthracnose is one of the most destructive diseases in Indonesia. Anthracnose in pepper caused by Colletotrichum acutatum have been reported to be predominant disease in pepper fields of Indonesia. Inheritance of resistance to anthracnose caused by C. acutatum in Capsicum annuum was studied.
Keyword: Inheritance, Anthracnose, Resistance, Pepper, Colletotrichum acutatum, Analisis silang dialel, Interaksi genetik x lingkungan

Judul: Genetic parameters estimation of pepper (Capsicum annuum L.) resistance to anthracnose (Colletotrichum acutatum) using diallel analysis
Abstrak: Anthracnose (Colletotrichum acutatum) is considered of the major disease that may cause significant yield losses in pepper. Resistance variety is important for controlling disease infection since other methods were not effective. The aim of this research is to identify pepper genotype resistance and estimating genetic parameters of pepper resistance to anthracnose. This experiment were done in three steps: (1) screening of pepper resistance to anthracnose, (2) estimating genetic parameters of pepper resistance to anthracnose using diallel analysis and (3) determining the selection character using path analysis. The first experiment was conducted using 21 genotypes and C. acutatum isolate BKT 04. Mature green fruit were inoculated using microinjection method. The result showed that based on disease incidence, there was no genotype which resistance to anthracnose. However, there were three genotypes (IPB C15 x IPB C10, IPB C15 and IPB C8) which resistance based on lesion diameter. Set population from half diallel crosses which involve 6 parents and 15 crosses with C. acutatum isolate BKT 04 were used in the second experiment. Disease resistance percentage and lesion diameter were used for estimating genetic parameters and combining ability. Disease incidence and lesion diameter were used for estimating heterosis. The results show that there is no non alellic interaction, gene effects for resistance to anthracnose were additive and dominance, dominance effect larger than additive effect, the degree of dominance was overdominance, genes distribution in the parents was assymetrical, anthracnose resistance was controlled by one gene group, broad-sense heritability was high and narrow-sense heritability was low. General combining ability of IPB C15 was high for disease resistance percentage and lesion diameter, specific combining ability of IPB C15 x IPB C9 was high for disease resistance percentage and specific combining ability of IPB C15 x IPB C10 and IPB C4 x IPB C2 were high for lesion diameter. Negative heterosis was expected in disease resistance traits, IPB C15 x IPB C9 had negative heterosis for disease incidence and IPB C10 x IPB C9 had negative heterosis for lesion diameter. The thickness of fruit flesh is recomended for selection criteria for developing anthracnose resistant pepper varieties.
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Judul: Formulasi Hamilton Untuk Menggambarkan Deformasi Gelombang Soliter Dengan Dasar Tidak Rata Pada Fluida Dua Lapisan
Abstrak: Gelombang internal adalah suatu gelombang yang muncul di bawah permukaan laut sehingga gelombang ini tidak teramati secara kasat mata. Formulasi Hamilton dirumuskan untuk menjelaskan gerak gelombang ini. Dalam hal ini diasumsikan bahwa fluida yang ditinjau terdiri atas dua lapisan dengan masing-masing lapisan memiliki rapat massa yang konstan. Selain itu, diasumsikan pula fluida yang ditinjau berupa fluida tak mampat (incompressible) dan tak kental (invicid). Formulasi Hamilton dilakukan dengan meninjau fluida dua lapisan yang berada pada domain yang dibatasi oleh batas atas yang rata dan batas bawah yang tidak rata. Hamilton (energi total)-nya didefinisikan sebagai penjumlahan antara energi kinetik dan energi potensialnya. Karena energi kinetik tidak secara eksplisit dinyatakan dalam peubah fisis, maka digunakan metode asimtotik untuk menentukan energi totalnya. Dalam hal ini diasumsikan bahwa gelombang interfacial yang ditinjau cukup panjang, dan amplitudo yang cukup kecil. Persamaan Korteweg de- Vries (KdV) diperoleh, jika disumsikan bahwa gelombang interfacial hanya merambat pada satu arah, sedangkan jika gelombang tersebut merambat ke dua arah, diperoleh persamaan Boussinesq.
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