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Articles by Supriyadi
Total Records ( 2 ) for Supriyadi
  Alridiwirsah , Koko Tampubolon , Fransisca Natalia Sihombing , Elseria Siburian , Zavandri Purba , Wagino , Yustina Sri Sulastri , Ida Rumia Manurung , Bayu Pratomo , Syahibal Karim , Sony Tri Septian Samosir , Supriyadi , Lanna Reni Gustianty and Fitra Syawal Harahap
  Background and Objective: The presence of weed in guava plants can lead to loss of the yield. Weed control in guava plants using glyphosate potassium salt has never been reported in Indonesia. This research was aimed to determine the potential of glyphosate potassium salt in controlling weed in the guava plants. Material and Methods: This research was conducted in the Telaga Sari Village, Sunggal sub-District, Deli Serdang District, North Sumatra Province, Indonesia from June until August 2019. This research used the Randomized Block Design Non-Factorial with the recommended dosage of glyphosate potassium salt (0, 0.25, 0.50, 0.75, 1 L ha1). Parameters include the weed density (broadleaf, grasses, and sedges) before efficacy, weed toxicity, fresh weight, dry weight, growth reduction, and weed control. Parameters were analyzed using the IBM SPSS Statistics v.20 software. Results: The results showed that the dominant weed group in guava plants was found in grasses weed of 52.76%. Glyphosate potassium salt herbicide was showed that significant toxicity to broadleaf, grasses and sedges at 1 and 2 weeks after spraying. Glyphosate potassium salt herbicide at the dose of 1 L ha1 was effective in controlling the fresh weight, dry weight, growth reduction and weed control of broadleaf of 0.79, 0.17 g; 96.61, 79.90% and effective in controlling grasses of 4.11, 2.03 g; 93.63, 84.40% and ineffective in controlling sedges weed. Conclusion: Hence it was concluded that, Glyphosate potassium salt herbicide at the dose of 1 L ha1 is highly suitable for controlling the broadleaf and grasses in guava plants.
  Bagus Fajar Pamungkas , Supriyadi , Agnes Murdiati and Retno Indrati
  Background and Objective: The optimal use of haruan scales for preparing collagen is a promising method to increase value-added products and to protect the environment. The aim of this research was to characterize the acid- and pepsin-soluble collagens from haruan (Channa striatus) scales. Materials and Methods: The fish scales were subjected to an extraction with 0.5 M acetic acid and a digestion with 0.1% pepsin. The results are presented as the mean±standard deviation. Results: The yields of the acid-soluble collagen in the haruan scales (ASC-SH) and the pepsin-soluble collagen in the haruan scales (PSC-SH) were 1.44 and 2.94% (on a dry basis), respectively. ASC-SH and PSC-SH contained glycine as the major amino acid and had high imino acid contents (238 and 242 residues/1,000 residues, respectively). Based on the SDS-PAGE pattern, both ASC-SH and PSC-SH were identified as type I collagens containing α1 and α2 chains. β and γ components were also found in both collagens. The FTIR spectra indicated that both collagens had triple helical structures. The collagens were both soluble at acidic pH levels (1-4) and their solubility was low when the NaCl concentrations were above 3% (w/v). Conclusion: It was concluded that haruan scales could be an alternative source of collagen and that the characteristics of the collagens were slightly affected by the extraction process used in this study.
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