Judul: Plant Parasitic Nematodes on Rice (Oryza sativa L.) in Medan Selayang District, Medan City, North Sumatra
Abstrak: Medan Selayang is one of the districts in Medan City, North Sumatra, and one of the rice production centers in Medan City. One of the problems faced regarding rice cultivation in Medan Selayang is disease caused by plant parasitic nematodes. Monitoring the presence of plant parasitic nematodes must be carried out to determine plant disease control strategies. This research examines a genus of plant parasitic nematodes on rice in Medan Selayang District, Medan City, North Sumatra. The research was carried out from January to March 2023 and carried out in seven stages: Survey and collecting samples from a rice field that exhibits symptoms of nematode infection. Extraction of parasitic nematodes in soil samples using the flotation-centrifugation method. Extraction of parasitic nematodes in root samples using the mist chamber method. Counting the number of parasitic nematodes. Making semi-permanent parasitic nematode preparations. Identifying the morphology of parasitic nematodes. Plant parasitic nematodes community analysis. Six genera of plant parasitic nematodes were identified from soil and root samples: Meloidogyne, Hirschmanniella, Tylenchus, Helicotylenchus, Criconemoides, and Criconemella. The dominant plant parasitic nematodes in the soil samples were Helicotylenchus (6.6/100 g of soil), while Meloidogyne dominated the roots (25/5 g of roots).
Keyword: Helicotylenchus, Meloidogyne, morphology identifications, nematodes

Judul: Nematoda Parasit Padi Sawah Di Kecamatan Terisi Kabupaten Indramayu
Abstrak: Paddy is plant producing staple food in Indonesia. The effort to increase paddy productivity face several handichapes, one of them is root parasitic nematodes. Nematodes are important parasite of paddy plant, because they can attack all parts of the plant including roots, stems, leaves, and panicles. Nematode infection causes various symptoms, such as plant stunting, leaf chloroses, root knot, and root rot. Research aimed to detect and identify parasitic nematode of paddy was conducted at paddy field selected from three villages of Terisi sub district, Indramayu District, West Java. Root samples were picked from plants taken from healthy-, area between healthy and infected-, and infected part of the plantation. The root samples were incubated in a mist chamber for nematode extraction. Part of the sample was stained for nematode detection. Identification of nematodes was based on the morphological characters. The parasitic nematodes of paddy found were Hirschmaniella, Pratylenchus, Helicotylenchus and Meloidogyne.
Keyword: root nematode., Meloidogyne, Hirschmaniella

Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
Keyword: