Judul: Pengaruh iradiasi sinar gamma pada polen kelapa Genjah Salak
Abstrak: Coconut plants are classified into two types namely Tall coconut and Dwarf coconut. Salak Dwarf coconut derived from South Kalimantan, the characteristic of Salak Dwarf Coconut is that is grow faster than Tall coconut. The objective of this research is to analyze the effect of gamma irradiation on pollen viability and chromosomes of Salak Dwarf coconut pollen. Pollen viability and chromosome pollen of Salak Dwarf coconut pollen were observed using microscope. The higher dosage of gamma irradiation, the lower pollen germination. At lethal doses of (LD50) gamma irradiation had caused the pollen germination viability less than half, from 31% to 14 to 19%, were 5-10 Gy. The dosage level of gamma irradiation dosages 5-15 Gy Chromosome number increase, how ever at dosage level 20-30 Gy chromosome number decrease. Irradiation caused the chromosome changed. Chromosomes number differed the level of gamma irradiation dosages. Artificial pollination in coconuts using gamma irradiation pollens should be used dosage irradiation less than 5 Gy.
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Judul: Penerapan Iradiasi Gamma untuk Memepertahankan Mutu Buah Salak Pondoh (Salacca edulis Reinw).
Abstrak: Salak pondoh setelah dipanen masih melakukan aktivitas fisiologis terutama respirasi yang berpotensi menjadi penyebab kerusakan buah jika tidak dilakukan penanganan pasca panen secara tepat. Selain itu kerusakan dapat terjadi karena serangan cendawan, yang dapat menyebabkan perbahan pada warna, aroma, rasa, tekstur, kekerasan dan penampilan menjadi tidak menarik, sehingga berpengaruh terhadap mutu dan nilai jual salak pondoh. Penelitian ini bertujuan untuk memepelajari pengaruh dosis iradiasi gamma terhadap mutu buah salak pondoh. Dosis iradiasi gamma yang diberikan adalah 2.27 kGy, 4.41 kGy dan 6.18 kGy. Setelah diiradiasi buah salak disimpan pada suhu 13 oC dan 28 oC dan diamati perubahan mutunya meliputi laju respirasi, kadar air, kekerasan, susut bobot dan uji organoleptik. Hasil penelitian menujukkan bahwa perlakuan iradiasi gamma pada dosis 2.28 kGy, 4.41 kGy dan 6.18 kGy efektif menekan gejala penyakit yang disebabkan oleh pertumbuhan cendawan. Iradiasi dengan dosis 2.28 kGy, 4.41 kGy dan 6.18 kGy tidak mampu menekan laju respirasi salak pondoh. Iradiasi mampu mempertahankan parameter mutu buah yang meliputi kekerasan, susut bobot dan kadar air.
Keyword: buah salak pondoh, gejala penyakit, iradiasi gamma, dosis iradiasi, mutu

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