Judul: Kepadatan dan Persebaran Parmarion martensi pada 15 Jenis Sayuran di Agropolitan Desa Gombong, Kecamatan Belik, Kabupaten Pemalang
Abstrak: Parmarion martensi merupakan siput setengah telanjang (semi-slug) yang memiliki cangkang kecil tereduksi. Siput ini menjadi hama dan menyerang tanaman. Tujuan penelitian ini adalah mengamati dan mempelajari kepadatan dan persebaran ukuran serta aktivitas makan P. martensi pada 15 jenis tanaman sayuran di Agropolitan Desa Gombong, Kecamatan Belik, Kabupaten Pemalang. Penentuan lokasi persebaran sampel dilakukan secara acak dengan membuat plot 1m x 1m setiap satu jenis sayuran dengan 3 kali ulangan. Pengamatan aktivitas makan P. martensi pada setiap jenis sayuran diamati secara visual. Pengukuran panjang tubuh P. martensi dilakukan setiap kali pengamatan. Pola kepadatan dan persebaran diketahui melalui analisis data menggunakan metode kuadrat dan Indeks Persebaran Morisita. Hasil penelitian menunjukan bahwa kepadatan P. martensi tertinggi ditemukan pada kacang buncis (Phaseolus vulgaris) sebesar 23,3 ind/m2, sedangkan kepadatan terendah ditemukan pada wortel (Daucus carota) dan seledri (Apium graviolens) sebesar 1,0 ind/m2. Pola persebaran P. martensi mengelompok dan lebih didominasi ukuran besar. P.martensi lebih suka memakan bagian daun.
Keyword: Densitas, hama, semi-slug

Judul: Kepadatan dan Persebaran Deroceras laeve dan Meghimatium bilineatum pada 10 Jenis Sayuran di Agropolitan, Cipanas
Abstrak: Deroceras laeve and Meghimatium bilineatum are slugs which are pest, that attacks the vegetables crop. The aims of this research is to study the density and distribution (pattern, feeding activity, and size) of D. laeve and M. bilineatum on 10 types of vegetables at Agropolitan, Cipanas. Sampling was conducted by quadrat method randomly. The highest density of D. laeve was 13.33 ind/m2 on Allium fistulotum and the lowest was 4 ind/m2 on Cripsum frutescens. The highest density of M. bilineatum was 6.22 ind/m2 on Solanum lycopersicum whereas the lowest was 0.56 ind/m2 on Daucus carota. Distribution Pattern of D.laeve and M. bilineatum is group. Distribution of D. laeve of small size (< 1.5 cm), medium (1.5−2.5 cm), and large (> 2.5 cm) were found in 9 different types of vegetables. Distribution of M. bilineatum of small size (< 2 cm) are rare, while the medium size (2−4 cm) and large (> 4 cm) were found in the 4 types of vegetables. Both D. laeve and M. bilineatum were prefer to eat leave than stems and tuberous root.
Keyword: Deroceras laeve, Meghimatium bilineatum, density, distribution

Judul: Comparison of HIV Model with and without Time Delay
Abstrak: Acquired immunodeficiency syndrome (AIDS) is the reduction of the human immune system. AIDS is caused by human immunodeficiency virus (HIV). No medicine has been found for this desease until recently. An AIDS therapy is usually performed with highly active antiretroviral therapy, namely reverse transcriptase inhibitors, protease inhibitors and combination of both. Various models have been developed to explain the immune system of patients with AIDS, namely the HIV, response and the time delay model. This paper discusses the comparison between the dynamics of the HIV virus, the dynamic response of protease inhibitors and dynamics of time delay. The dynamics model of HIV is influenced by the level of white blood cells produced and the rate of its death. Dynamics of protease inhibitors on the response and the time delay model is influenced by the death rate of infected white blood cells and the failure rate of treatment.
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