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ULIN: Jurnal Hutan Tropis
Published by Universitas Mulawarman
ISSN : 25991205     EISSN : 25991183     DOI : -
Core Subject : Social,
Environmental Science
ULIN: Jurnal Hutan Tropis published by Forestry Faculty of Mulawarman University, which is published twice a year in March and September with p-issn 2599-1205 and e-issn 2599-1183. It contains articles of research or study of literature in the field of Forest Management, Forest Conservation, Silviculture, and Forest Product. Language used for full article in this journal is Bahasa Indonesia, abstract in English and Bahasa Indonesia.
Arjuna Subject : Ilmu Lingkungan (semua ketegori) - Ilmu Lingkungan (Lain-Lain)
Articles 12 Documents
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Search results for , issue "Vol 5, No 2 (2021)" : 12 Documents clear
Pengaruh Waktu Kupas dan Volume Kayu Terhadap Produktivitas dan Biaya Pengupasan Kulit Kayu Hutan Alam Sona Suhartana; Yuniawati Yuniawati
ULIN: Jurnal Hutan Tropis Vol 5, No 2 (2021)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (468.408 KB) | DOI: 10.32522/ujht.v5i2.6155

Abstract

Debarking is the activities in the loading point after bucking. The purpose of debarking is to clean wood from bark and reduce the wood moisture content to be easier for further handling. The research method was carried out by selecting the location of 2 loading points where debarking was done, measuring the debarking time and the log volume, and then analyzing the effect of debarking time and log volume on the productivity of debarking with multiple regression analysis. The results showed that: 1)  The average debarking produkctivity in loading point 1 was 21.12 m3/hr an average debarking time of 25.49 minutes and log volume of 9.16 m3; 2) The average productivity of debarking in the second loading point was 20.77 m3/hr with an average debarking time of 19.45 minutes and a log volume of 6.81 m3; 3)The average of debarking cost at loading point #1 is lower than at loading point#2; 4) The resulting regression equation model is Y = 20,931.001 – 49,516.314 X1 + 2.324 X2; and 5)The log volume is significant to debarking productivity, while the debarking time is negative
Aktivitas Antioksidan, Kandungan Total Fenolik dan Kandungan Total Flavonoid Pada Beberapa Tumbuhan Berkhasiat Obat Di Kalimantan Timur, Indonesia Nur Maulida Sari; Irawan Wijaya Kusuma; Nur Indriana Fitriah
ULIN: Jurnal Hutan Tropis Vol 5, No 2 (2021)
Publisher : Fakultas Kehutanan Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32522/ujht.v5i2.6224

Abstract

Antioxidant activity, total phenolic and total flavonoid contents of some traditional medicinal plants grown in East Kalimantan, Indonesia, were investigated. Plant sample are Macaranga gigantea leaf, Ceiba pentandra leaf, Ceiba pentandra bark, Blumea balsamifera leaf and Artocarpus altilis leaf. Natural antioxidants from plant species are considered safe. Therefore, people are now more interest in finding out the treatment through natural remedies. The plant's total phenolic content was determined by the Folin-Ciocalteu method, while total flavonoid content was determined by the Colorimetric assay method. Antioxidant activity was evaluated by DPPH radical scavenging assay. The results showed that plant samples tested contained 22.02 to 214.88 µg of gallic acid equivalents (GAE)/mg extract represented the total phenolic content. The flavonoid content of the samples was in range from 50.00 to 896.67 µg of catechin equivalents (CE)/mg extract. The plant samples displayed ability to inhibit DPPH free radical formation by 59-81% at 50 ppm concentration. These finding suggest that these plants could possess natural antioxidants and give a scientific basis to the traditional uses of the investigated plants.

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