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All Journal Diponegoro Journal of Management Biosaintifika: Journal of Biology & Biology Education
Eka Puji Lestari
Universitas Udayana
Agriculture, Biological Sciences & Forestry Decision Sciences, Operations Research & Management

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Diversity Induction of Dendrobium sylvanum Orchid through In Vitro Irradiation of Gamma Ray Lestari, Eka Puji; Yunus, Ahmad; Sugiyarto, Sugiyarto
Biosaintifika: Journal of Biology & Biology Education Vol 10, No 3 (2018): December 2018
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (415.351 KB) | DOI: 10.15294/biosaintifika.v10i3.16265

Abstract

Dendrobium sylvanum orchid is categorized as lowland habitus orchid and able to survive wihtout any shade. Orchid cultivation takes a very long time so it needs faster cultivation and producing large quantities. Therefore, it is necessary to do orchid culture by using tissue culture processes and then given gamma ray irradiation to bring up new characters in the orchid .The purpose of this research was to discover the impact of gamma ray irradiation in vitro to the diversity of D. sylvanum. The doses of gamma ray used in this research were 0 Gy, 15 Gy, 30 Gy, 45 Gy, and 60 Gy. The results obtained indicated that mutation mostly occurred on the treatment with 15 Gy (4.4 cm of plant height, 2.67 of leaves, 2.36 cm of leaf length, 0.49 cm of leaf width, and 5.33 of root strands) compared to the other doses and the control plants. The new finding in this research is the gamma ray dose that can optimally stimulate the mutation in D. sylvanum. This information is useful to generate the new variety in orchid cultivation in Indonesia. This research provides innovation in orchid cultivation and new variety that is possible to arise after the mutation.
ANALISIS FAKTOR-FAKTOR YANG MEMPENGARUHI KINERJA PERUSAHAAN (Studi Pada Perusahaan Manufaktur yang Terdaftar di Bursa Efek Indonesia Tahun 2011-2015) Lestari, Eka Puji; Sampurno, R. Djoko
Diponegoro Journal of Management Volume 6, Nomor 3, Tahun 2017
Publisher : Faculty of Economics and Business Diponegoro University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (233.109 KB)

Abstract

Firm performance is an important part for measuring the success company for being the first thing that will be seen by an investor. This study aimed to analyze the effect of the cash conversion cycle, cash holding, tangible fixed assets, current ratio, leverage, growth, and size on firm performance. Proxy that used to measure firm performance in this study is Return on Assets (ROA).The population in this study are all manufacturing companies listed in Indonesia Stock Exchange for period 2015-2016. Purposive sampling is used to determine the number of samples, 20 companies manufacturing used in this study. The analytical method used is the data panel regression with a significance level of 5% .These results indicate that the cash conversion cycle has significant negative effect on firm performance. Cash holding has insignificant negative effect on firm performance. Tangible fixed assets has significant negative effect on firm performance. Current ratio has significant positive effect firm performance. Leverage significant negative effect on firm performance. Growth significant positive effect on firm performance. Size insignificant negative effect on firm performance. In this study the cash conversion cycle (CCC), holding cash, tangible fixed assets, current ratio, leverage, growth, size are able to explain the firm performance by 94% and the other is explained by other factors beyond research.
Co-Authors Djoko Sampurno Sugiyarto Sugiyarto Yunus, Ahmad