Judul: Perlakuan Priming Benih untuk Mempertahankan Vigor Benih Kacang Panjang (Vigna unguiculata) Selama Penyimpanan
Abstrak: The objective of this research was to study the effect of priming to maintain vigor of longbean seeds during storage. The treatments were priming in water, KNO3, CaCl2, ascorbic acid, and imbibition beetwen papers for two hours. Osmoconditioning and hydropriming increased seeds moisture content about 9% whereas imbibition between papers increased about 1-2% over the control. After teatment, the seeds were dryed back to reduce moisture content to about 12-13% and then stored in ambient (26-30.8 °C; RH 68-77 %) and AC (±20 °C; RH ±50%) temperature packed in polypropilen plastic bags (thick 0.08 mm). Hydropriming, priming in CaCl2, KNO3, and ascorbic acid solution increased vigor index and speed of germination longbean seeds. The advantages of these treatments could be maintained until 15 weeks of storage, both in AC and ambient temperature. Hydropriming was the best choice for seed treatment before storage, because it was inexpensive and easy to applied.
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Judul: The Utilization of Ultrafine Bubbles (UFB) Water for Priming of Bean (Phaseolus vulgaris) Seeds
Abstrak: Priming adalah teknik hidrasi-dehidrasi benih untuk meningkatkan proses metabolisme sebelum perkecambahan untuk mempercepat perkecambahan dan pertumbuhan bibit dalam kondisi normal dan stres. Penelitian ini bertujuan untuk mempelajari pemanfaatan UFB water sebagai upaya meningkatkan viabilitas dan vigor benih sebelum tanam dan selama penyimpanan. Penelitian dilakukan di Laboratorium Pengujian mutu benih IPB, Indonesia. Penelitian terdiri dari dua percobaan yaitu priming UFB water untuk meningkatkan viabilitas dan vigor benih buncis serta daya simpannya setelah priming. Priming menggunakan aquades, UFB water 8 ppm yaitu menggunakan oksigen dari ruangan dan UFB water 20 ppm menggunakan injeksi oksigen murni. Percobaan pertama disusun menggunakan (RAL) Rancangan acak lengkap dengan kombinasi perlakuan lot benih (L1: persentase daya berkecambah (DB) awal sekitar 80%, L2: DB awal sekitar 70%, dan L3: DB awal sekitar 60%) dengan priming (P0: tanpa priming/kontrol, P1: direndam aquades selama 60 menit, P2: aquades selama 120 menit, P3: UFB water 8 ppm selama 60 menit, P4: UFB water 8 ppm selama 120 menit, P5: UFB water 20 ppm selama 60 menit, P6: UFB water 20 ppm selama 120 menit). Percobaan kedua disusun menggunakan nested dengan faktor utama adalah kondisi ruang penyimpanan dan priming sebagai faktor kedua tersarang pada faktor utama. Faktor kondisi ruang penyimpanan terdiri dari KM: ruang kamar (suhu 28±5˚C, RH 73±7%) dan AC: ruang ber-AC (18±2 C, RH 61±7%). Faktor priming terdiri dari dua taraf yaitu P0: tanpa priming dan P1: priming dengan UFB water 20 ppm selama 120 menit. Hasil penelitian menunjukkan bahwa perlakuan priming dengan UFB water 20 ppm selama 120 menit sebagai perlakuan pra tanam dapat meningkatkan viabilitas benih buncis, khususnya benih dengan viabilitas awal rendah, dan benih buncis dengan viabilitas awal sekitar 80% tidak bisa dipertahankan viabilitasnya selama 16 minggu penyimpanan di ruang ber-AC maupun ruang kamar, kemungkinan dikarenakan kadar air benih sebelum simpan yang masih tinggi., Priming is a seed hydration-dehydration technique of seed to improve metabolic processes before germination to accelerate germination, seedling growth under normal and stress conditions. This research is aimed to study the pretreatment using UFB water as an effort to increase viability and vigor of seeds before planting (pre-planting) and during storage (pre-storage). This research was conducted at the Laboratory of seed quality testing, IPB University, Indonesia. The research consisted of two experiments, i.e., UFB water priming to increase viability and vigor of Phaseolus vulgaris seeds and its storability after priming. Priming uses aquadest, UFB water 8 ppm which uses oxygen from the room and UFB water 20 ppm uses pure oxygen injection. The first experiment was arranged using a completely randomized design with a combination of seed lot treatments (L1: initial germination percentage (GP) about 80%, L2: initial GP around 70%, and L3: initial GP around 60%) with priming (P0: no priming/control, P1: soaked in distilled water for 60 minutes, P2: distilled water for 120 minutes, P3: UFB water 8 ppm for 60 minutes, P4: UFB water 8 ppm for 120 minutes, P5: UFB water 20 ppm for 60 minutes, P6: UFB water 20 ppm for 120 minutes). The second experiment was arranged using a nested design with the main factor being the condition of
Keyword: air-conditioned room, room conditions, seed storability, viability, vigor

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