Judul: Induksi Mutasi Kromosom dengan Iradiasi Sinar Gamma Cobalt60 untuk Merakit Padi (Oryza sativa) Tahan Kekeringan secara In Vitro
Abstrak: A lot of people in the world choose rice as their main source of carbohydrate beside maize and wheat. The increasing of world population make increasing of the rice demand. Increasing of the rice demand doesn’t followed by the rice supply. In order to solve that problem, researcher try to find a new paddy cultivar which is can be planted in dry area. This research aims to study the osmotic pressure that still can be accepted by paddy var. Sintanur, to study LD50 (lethal dose 50) value in the paddy especially in Sintanur and to study the interaction between irradiation and the osmotic pressure. In this research, paddy var. Sintanur is irradiated by gamma ray of Cobalt60 at six dosages 0 Gray, 100 Gray, 200 Gray, 300 Gray, 400 Gray, 500 Gray. Then each irradiated seed is planted at four kind of mediums that contains Polyethylene glycol (PEG) at four levels of concentration are I0 (0 g/l PEG), I1 (116,538 g/l PEG), I2 (174,6 g/l PEG) and I3 (219,547 g/l PEG). Based on the data analyzed, the highest PEG concentration for drought tolerant selection in paddy var. Sintanur is 174,674 g/l PEG. There is an interaction between irradiation and PEG medium that influencing plant height and shoot multiplication. LD 50 (lethal dose 50) of paddy var. Sintanur is 375 Gy.
Keyword: 

Judul: Induksi Mutasi dengan Radiasi Sinar Gamma pada Padi  (Oryza sativa L.) Sensitif dan Toleran Aluminium
Abstrak: Induksi mutasi dengan radiasi sinar gamma merupakan salah satu cara untuk merakit varietas padi yang baru, seperti varietas padi yang toleran terhadap aluminium (Al) yang dapat beradaptasi pada lahan masam. Tujuan dari penelitian ini adalah menginduksi mutasi pada padi varietas IR64 dan Hawara Bunar dengan radiasi sinar gamma 60Co untuk mendapatkan galur padi yang berubah toleransinya terhadap keracunan Al. Penelitian menggunakan Rancangan Acak Lengkap (RAL) Faktorial dengan 2 faktor. Faktor pertama adalah varietas padi terdiri dari IR64 dan Hawara Bunar. Faktor kedua adalah dosis radiasi sinar gamma yaitu : 0, 0.2, dan 0.3 kGy. Masing-masing perlakuan menggunakan 50 tanaman, sedangkan kontrol masing-masing menggunakan 10 tanaman.
Keyword: 

Judul: Penggunaan Teorema Homeomorphy 2-Manifold dan Teorema Euler Poincare pada Torus 𝑇�� dan Simplicial Complex 𝐾��
Abstrak: Two dimensional topological spaces are said to be homeomorphic if they have the same topological invariant, where one of topological invariant used is an Euler characteristic. Homeomorphy 2-Manifold’s Theorem and Euler Poincare’s Theorem are used to distinguish two topological spaces. Homeomorphy 2-Manifold’s Theorem uses Euler characteristic to identify two dimensional topological spaces. Euler Poincare’s Theorem is an alternative way to find Euler characteristic with Betti number, which is topological invariant as well. The objective of this paper is to investigate the homeomorphism of torus 𝑇����� and simplicial complex 𝐾�����. Topological space torus and simplicial complex 𝐾����� have the same Euler characteristic, which is two. Based on Homeomorphy 2-Manifold’s Theorem topological space torus 𝑇����� and simplicial complex 𝐾����� is homeomorphic.
Keyword: simplicial, torus, Euler, homeomorphism, topology