Judul: Pengaruh iradiasi sinar gamma terhadap pertumbuhan plb anggrek Dendrobium lasianthera (JJ. Smith) secara in vitro
Abstrak: This research aimed to learn the effect of gamma ray-irradiation on protocorm like bodies (plb) Dendrobium lasianthera and determined Lethal dosage (LD) 30 and 50. The irradiation has done at the Center of Technology Application of Isotops and Radiation, Nuclear Energy Agency (PATIR-BATAN), the research started from February 2014 to July 2014. The research implemented the completely randomized design (CRD) with a single factor that gamma rayirradiation dosage were 0 Gy, 20 Gy, 40 Gy, 60 Gy, 80 Gy, and 100 Gy. Each dose of gamma ray-irradiation treatment was repeated 5 times, of which there were 30 units of the experiment and each experimental unit consisted of five culture bottles were individually planted 4 plb Dendrobium lasianthera. The results of this research showed that the effect of gamma ray-irradiation dose significantly decreased the percentage of live plb, percentage of plb germination, number of leaves, number of roots, the percentage of rooted plant. Plantlets changes observed among other wide leaves, and the spiral leaves. Lethal dose 30% (LD30) was at 19.7697 Gy irradiation dose and LD50 was at 67.3504 Gy irradiation dose.
Keyword: Bogor Agricultural University (IPB), mutation, Lethal Dosage (LD), in vitro, gamma ray-irradiation, Dendrobium lasianthera

Judul: Keragaan Planlet Dendrobium Lasianthera (Jj. Smith) Hasil Iradiasi Sinar Gamma Generasi Mv1
Abstrak: Dendrobium merupakan salah satu genus anggrek yang paling banyak diminati oleh konsumen. Dendrobium lebih disukai karena bentuk dan warna bunganya lebih bervariasi, daya tahan kesegaran bunganya lebih lama, produktivitasnya tinggi dan harganya terjangkau. Salah satu anggrek dendrobium spesies yang ada di Indonesia dan dipergunakan dalam penelitian ini adalah Dendrobium lasianthera (JJ. Smith) yang berasal dari Papua Nugini dengan ciri khasnya berpetal keriting. Penelitian ini bertujuan untuk mengidentifikasi keragaman karakter kuantitatif dan keragaan planlet Dendrobium lasianthera (JJ. Smith) setelah aklimatisasi yang sebelumnya telah diiradiasi sinar gamma pada kondisi in vitro dengan dosis 0, 20, 40, 60 dan 80 Gy. Hasil dari penelitian ini menunjukkan bahwa iradiasi sinar gamma dapat menginduksi keragaman dan berpengaruh nyata terhadap karakter kuantitatif yaitu jumlah daun, panjang daun, lebar daun, tinggi tanaman, jumlah akar, panjang akar, ukuran stomata, kerapatan stomata dan pengurangan jumlah kromosom. Pada keragaan tanaman juga terdapat perubahan berupa bentuk daun, bentuk ujung daun, tekstur permukaan daun, simetri daun dan tanaman roset.
Keyword: anggrek, keragaman, kromosom, karakter kuantitatif, stomata

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