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All Journal Jurnal Ilmu Pertanian Indonesia Jurnal Silvikultur Tropika (JST) Jurnal Sain Veteriner Public Health of Indonesia Indonesian Journal of Chemistry Biosaintifika: Journal of Biology & Biology Education Jurnal Pendidikan Sejarah dan Riset Sosial Humaniora (KAGANGA) Jurnal Ilmu dan Teknologi Kayu Tropis Jurnal Pembelajaran Pemberdayaan Masyarakat (JP2M) Jurnal Peduli Masyarakat Jurnal Kedokteran Universitas Palangka Raya Jurnal Sylva Lestari Jurnal Ilmu Kehutanan
Rita Kartika Sari
Departemen Hasil Hutan, Fakultas Kehutanan, Institut Pertanian Bogor Kampus IPB Darmaga Bogor, 16680
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Earth & Planetary Sciences Education Energy Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology Public Health Social Sciences Veterinary Other

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Physical and Mechanical Properties of Cross-Laminated Timber Made of a Combination of Mangium-Puspa Wood and Polyurethane Adhesive Tengku Muhammad Renzy Hariz; Yusuf Sudo Hadi; Muhammad Adly Rahandi Lubis; Muhammad Iqbal Maulana; Rita Kartika Sari; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 11 No. 1 (2023): January
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i1.645

Abstract

This study aimed to evaluate the physical and mechanical properties of cross-laminated timber (CLT) characteristics from mangium (Acacia mangium) and puspa (Schima wallichii) woods and their combination using polyurethane (PU 1.2) adhesives. The manufacture of CLT began with basic adhesive characterization and thermo-mechanical analysis. Wood material’s physical and chemical properties were also tested with its response to the PU 1.2 wettability. The CLT (100 ´ 30 ´ 3.60) cm3 was manufactured with 160 g/m2 glue spread at a pressure of 0.80 MPa for 200 minutes. The CLT panels were characterized refers to the JAS 3079  standard. The results show that PU 1.2 had a gelatination time of 182.1 minutes at 25°C, was able to form urethane groups, and experienced an increase in storage modulus at 35°C. Mangium and puspa woods have different physical and chemical properties, but they interact similarly with PU 1.2 wettability. Puspa CLT panel has a higher density than mangium but lower dimensional stability. The bending mechanical properties of hybrid puspa-mangium-puspa CLT were able to match puspa CLT and have one sample of shear strength that met the JAS 3079 standard in both grain directions. Therefore, hybrid puspa-mangium-puspa CLT has the potential to be developed to improve its dimensional stability and mechanical properties. Keywords: Acacia mangium, cross-laminated timber, layer combination, polyurethane adhesive, Schima wallichii
Distribusi Sel Pori pada Kayu Tarik dan Korelasinya dengan Komposisi Lignin Deded Sarip Nawawi; Istie Sekartining Rahayu; Nyoman Jaya Wistara; Rita Kartika Sari; Wasrin Syafii
Jurnal Ilmu Kehutanan Vol 13, No 1 (2019)
Publisher : Fakultas Kehutanan Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (349.755 KB) | DOI: 10.22146/jik.46207

Abstract

Sifat anatomi kayu tarik dianalisis untuk parameter jumlah dan diameter pori dan korelasinya dengan komposisi lignin. Sampel kayu reaksi diambil dari batang pohon mindi (Melia azedarach) yang tumbuh miring. Pembentukan kayu tarik menurunkan jumlah dan diameter pori dan sebagai implikasinya meningkatkan proporsi serat. Jumlah dan diameter pori berkorelasi positif dengan kadar lignin. Nisbah siringil/guaiasil dan erythro/threo struktur β-O-4 berkorelasi negatif dengan jumlah dan diameter pori. Hasil penelitian ini mengkonfirmasi bahwa perubahan proporsi sel penyusun kayu akibat tegangan pertumbuhan merupakan salah satu faktor penting yang berpengaruh terhadap perubahan karakteristik kimia lignin kayu tarik. Distribution of Vessels in Tension Wood and Its Correlation with Lignin CompositionAbstractThe anatomical properties of tension wood were investigated for number and diameter of vessel and its correlation with lignin composition. Reaction wood sample was taken from the leaning stem of mindi (Melia azedarach). The formation of tension wood reduced the number and size of vessel and, consequently, increased the proportion of fiber. Number and diameter of vessels positively correlated with lignin content. However, syringyl/guaiacyl ratio of lignin and erythro/threo ratio of β-O-4 structures were negatively correlated with number and diameter of vessels. It was confirmed that changes in the proportion of wood cell was an importance factor influencing the changes in chemical characteristic of tension wood lignin.
Characteristics of Polyurethane Cross-Laminated Timber Made from a Combination of Pine and Coconut Muhammad Iqbal Adi Baskara; Yusuf Sudo Hadi; Muhammad Adly Rahandi Lubis; Muhammad Iqbal Maulana; Rita Kartika Sari; Fauzi Febrianto; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 11 No. 2 (2023): May
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i2.691

Abstract

The objective of this study was to assess the properties of cross-laminated timber (CLT) fabricated from the combination of Sumatran pine (P) and coconut trunk (C) bonded with polyurethane adhesive. The basic properties of raw materials and adhesives were characterized. The CLT panels’ length, width, and thickness are 100 cm by 30 cm by 3.6 cm, respectively. Three-layer CLT was made with 4 combinations of face/core/back lamina, i.e., PPP, CCC, PCP, and CPC, which are arranged perpendicular to each other. The laminae were bonded using PU adhesive on 160 g.m-2 glue spread. The CLT’s delamination and wood failure percentages (WFP) were assessed following the JAS 3079 (2019) standard. The study’s results demonstrated that the PU adhesive employed in this investigation could curl ideally at 30°C for 200 min. Solid pine and coconut’s physical and chemical characteristics differed, but their wettability to polyurethane adhesives was identical. Hybrid pine CLT has greater attributes compared to single pine CLT. Single coconut CLT, on the other hand, offers better features than hybrid coconut CLT. All CLT samples failed to fulfil the JAS 3079 (2019) requirement for delamination (=< 10%) and WFP (>= 90%). Keywords: Coconut trunk, cross-laminated timber, layer combination, pine wood, polyurethane adhesive
Antimicrobial and Antioxidant Activities of Resins and Essential Oil From Pine (Pinus merkusii, Pinuso ocarpa, Pinus insularis) and Agathis (Agathis loranthifolia) Mardho Tillah; Irmanida Batubara; Rita Kartika Sari
Biosaintifika: Journal of Biology & Biology Education Vol 9, No 1 (2017): April 2017
Publisher : Department of Biology, Faculty of Mathematics and Sciences, Semarang State University . Ro

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.15294/biosaintifika.v9i1.8371

Abstract

The most common human pathogen that colonizes in a third of healthy people around the world are Staphylococcus aureus, and one of the materials allegedly able to overcome the pathogen is resin. Resin has been used in folk medicine for thousands of years to treat diseases. The antimicrobial activity of natural resins can be associated with a variety of organic compounds contained in them such as diterpenoids and triterpenoids. This research aimed to explore the antibacterial and antioxidant activities of Pinus merkusii, P. oocarpa, P. insularis, Agathis loranthifolia resins and essential oil. Resin was separated by distillation process to get essential oil and the residue was extracted using n-hexane, ethyl acetate (EtOAc), and methanol (MeOH). Antioxidant activity was performed by DPPH (1,1diphenyl-2-picryl hydrazyl) radical scavenging method. The antibacterial activity of resins and essential oil of the samples determined using the disc diffusion method against Staphylococcus aureus and Escherichia coli. The results showed that the yield of resin extract was ranging from 8.44 % to 95.56%. All extracts and essential oil could not inhibit E coli growth but inhibit the S. aureus growth. This experiment concluded that resin n-hexane extract from P.oocarpa was the most potent as antibacterial activity against S. aureus. All of the samples used had less potential antioxidant activity compared to positive control ascorbic acid. Result of this study show that pine resin from Indonesia has potential as an antibacterial agent. 
Ultrasound-Assisted Extraction of Antimalarial Compounds from the Bidara Laut (Strychnos ligustrina) Heartwood Sri Familasari; Rita Kartika Sari; Wasrin Syafii; Anne Carolina; Umi Cahyaningsih; Siti Sa'diah
Jurnal Sylva Lestari Vol. 11 No. 3 (2023): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i3.682

Abstract

The aqueous wood extract of bidara laut (Strychnos ligustrina) from maceration demonstrated the greatest antimalarial activity against Plasmodium falciparum strain 3D7. However, this method has several limitations, including a lengthy extraction time, which allows for microorganism contamination. The aim of this study was to quantify the yield, evaluate the antimalarial effectiveness of the P. falciparum growth in-vitro, and analyze the aqueous bidara laut heartwood extracts phytochemical composition from the two different extraction methods,  namely the method of maceration extraction for 24 hours and the ultrasound-assisted extraction (UAE) for 30 (UAE30), 45 (UAE45), and 60 (UAE60) minutes. The bidara laut heartwood extract from the UAE60 method had relatively similar yield and antimalarial activity with the bidara laut heartwood extract from the UAE45 method. However, these extracts had higher yield and antimalarial activity than the extracts from the maceration and the UAE30 methods. The results of LC-MS/MS analysis revealed that the main compounds in the UAE45 and UAE60 extracts were strychnine, quinaprilat, and 3,4-bis-cyclobut-3-ene-1,2-dione, which has potent antimalarial properties. Keywords: antimalarial activity, Plasmodium falciparum, quinaprilat, strychnine, Strychnos ligustrina
Chemical Constituent of Acacia auriculiformis Wood Extractives and Their Antioxidant Activity Yanico Hadi Prayogo; Irmanida Batubara; Rita Kartika Sari; Saat Egra; Kosei Yamauchi; Tohru Mitsunaga; Wasrin Syafii
Jurnal Sylva Lestari Vol. 11 No. 3 (2023): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i3.753

Abstract

Acacia auriculiformis showed good potential to be developed as a raw material for bioactive compounds. The heartwood of A. auriculiformis is still rarely explored. The purpose of this study was to identify the bioactive components of the heartwood. Six compounds were identified from the heartwood through nuclear magnetic resonance and mass spectroscopy, namely the C-3,4',7,8 hydroxyl substituted flavonoids and chalcone. Two methylated teracacidins and chalcone-like teracacidin were identified for the first time in the A. auriculiformis heartwood, along with three known compounds. These compounds showed good radical scavenging and reduction activity, compared to crude extract and ascorbic acid, using three different antioxidant assays. The molecular structure-dependent activity was observed to affect the trend of the different antioxidant activities. This finding shows good potential for further development of plant parts of A. auriculiformis from Indonesia as new raw materials for medicines. Keywords: Acacia auriculiformis, antioxidant, chalcone, flavonoid, heartwood
Influence of Puspa Wood and Coconut Trunk Combination on the Characteristics of Cross-Laminated Timber Bonded with Polyurethane Adhesive Siti Aisyah; Yusuf Sudo Hadi; Muhammad Adly Rahandi Lubis; Muhammad Iqbal Maulana; Rita Kartika Sari; Wahyu Hidayat
Jurnal Sylva Lestari Vol. 11 No. 1 (2023): January
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v11i1.647

Abstract

The purpose of this study was to evaluate the characteristic of cross-laminated timber (CLT) made from puspa (Schima wallichii) wood, coconut (Cocos nucifera) trunk, and their combination using a polyurethane (PU) adhesive. The manufacturing of CLT begins with the characterization of the adhesive and wood materials used in this study. The CLT panels are made with dimensions of 100 cm × 30 cm × 3.6 cm. The laminate was organized into three layers with the face/core/back, namely puspa wood (PPP), coconut trunk (CCC), and their combination (PCP and CPC), perpendicular to each other using polyurethane adhesive with a glue spread of 160 g.m-2. The physical and mechanical properties of the CLT were assessed according to the JAS 3079 (2019) standard. The results showed that the polyurethane adhesive used in this study could cure optimally at a temperature of 30°C for 200 minutes. Puspa wood and coconut trunk had different physical and chemical properties but had similar wettability to polyurethane adhesives. The physical and mechanical characteristics of coconut CLT were better than puspa CLT. Based on the overall test results, the puspa hybrid CLT is better than the single wood species of the CLT. In contrast to coconut hybrid CLT, the single CLT of CCC was better than its hybrid CLT. Keywords: Coconut trunk, cross-laminated timber, layer combination, polyurethane adhesive, puspa wood
Leukocyte Profile of Mice Infected with Plasmodium berghei and Treated with Aqueous Extract of Strychnos Ligustrina and Its Combination with Dihydroartemisinin Piperaquine Phosphate (DHP) Umi Cahyaningsih; Siti Sa&#039;diah; Wasrin Syafii; Rita Kartika Sari; Arifin Budiman Nugraha
Jurnal Sain Veteriner Vol 41, No 3 (2023): Desember
Publisher : Faculty of Veterinary Medicine, Universitas Gadjah Mada bekerjasama dengan PB PDHI

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/jsv.88896

Abstract

Malaria is still one of the most highly pathogenic diseases, which remains a significant problem for public health. Natural compounds are alternative ways as an antimalarial compound that are applied for the artemisinin combination. The aim of this study was to determine the effect of a combination of S. ligustrina extract and DHP on the differential leukocytes percentages. This study used 100 mice which were divided into five groups. Group A and B were used for the healthy mice and infected-untreated groups, respectively. Group C used as a controlled drug, received 222 mg/kg BW of DHP. Group D received 300 mg/kg BW of aqueous extract of S. ligustrina. Group E received a combination between 111 mg/kg BW of DHP and 200 mg/kg BW of aqueous extract S. ligustrina. The findings demonstrated that DHP and S. ligustrina extract had an impact on neutrophils, lymphocytes, inhibition, and percentages of parasitemia. The findings revealed that treatment groups C, D, and E reduced the percentage of parasitemia. The percentage of neutrophils in treated groups was significantly higher than in group A (P<0.05). The percentage of lymphocytes was lower in the treated groups, while the percentages of eosinophils, monocytes, and basophils did not significantly different (P<0.05). This study found that group D and E had the same effect on the leucocyte profile as group C. Our findings suggest that the aqueous extract of S. ligustrina, as well as the combination treatment with DHP, have the potential to lead to the discovery of new antimalarial medicines.
Hydrolytic Stability of Sengon-Oriented Strand Board Bonded with Hybrid Phenol-Formaldehyde/Polymeric Methylene Diphenyl Diisocyanate Adhesives Sari, Rita Kartika; Fitrianum, Fadilah; Maulana, Muhammad Iqbal; Hidayat, Wahyu; Winarni, Ina; Iswanto, Apri Heri; Lubis, Muhammad Adly Rahandi
Jurnal Sylva Lestari Vol. 12 No. 3 (2024): September
Publisher : Department of Forestry, Faculty of Agriculture, University of Lampung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.23960/jsl.v12i3.987

Abstract

The hydrolytic stability of oriented strand board (OSB) is critical to guarantee good performance in humid conditions over the long term. The adhesive system impacts hydrolytic stability in addition to the wood strands. This study aims to investigate the hydrolytic stability of OSB bonded with a hybrid adhesive based on phenol-formaldehyde (PF) and polymeric methylene diphenyl diisocyanate (pMDI) modified with NaOH and CaCO3 catalyst. PF was mixed with each catalyst at approximately 1% of the PF solids content. The pMDI was added to the mixture at 2.5% and 5% of the PF solid content. The hybrid PF/pMDI adhesives were then used for OSB production. The hydrolytic stability of OSB samples was tested at 25°C and 100°C and compared with OSB using unmodified PF as a control. After hydrolysis, OSBs with hybrid PF/pMDI adhesives had lower weight loss than control adhesives at both temperatures. The pH indicates no significant polymer dissolution from the board into the hydrolysis solution. Hybrid PF/pMDI adhesives with a CaCO3 catalyst obtain significantly lower thickness swelling values. The findings of this study have significant implications for developing high-performance, environmentally-friendly OSB products. Keywords: eco-friendly composite, hydrolytic stability, oriented strand board, Paraserianthes falcataria, phenol-formaldehyde
Pengetahuan Kecacingan Menggunakan Media Video Pada Siswa Sekolah Dasar Sahariyani, Menik; Sari, Rita Kartika; Tasyahuri, Syabila Aldiffah
Jurnal Kedokteran Universitas Palangka Raya Vol 12 No 2 (2024): Jurnal Kedokteran Universitas Palangka Raya
Publisher : Fakultas Kedokteran, Universitas Palangka Raya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37304/jkupr.v12i2.14163

Abstract

Helminthiasis in children still occurs in Seren Rembang. Educational video can enhance knowledge and attitudes in order to reduce the morbidity of Helminthiasis.  This study aims to determine the impact of providing Helminthiasis educational video on the level of knowledge and attitude of students at SDN Seren Rembang. Research method is Quasi Experimental using a "pre-post test one group only" design. Total sampling involved 37 students of SDN Seren Rembang. Two questionnaires utilized to measure the knowledge and the attitude. Data analysis using the Paired Sample t-test. Result : Educational video is able to increase the average level of students' knowledge and attitude from 4.43 into 7.75, and from 30.43 into 33.37, respectively. Paired samples t-test is significant for both knowledge (p = 0,000), and attitude (p = 0,002). This study conclude that providing Helminthiasis educational video affect the level of knowledge and attitude of students at SDN Seren Rembang.
Co-Authors . Siswoyo A.A. Ketut Agung Cahyawan W Adesna Fatrawana Agus Ari Subagio Agus Hikmat Akbar, Mohammad Dhanny Alawiyah, Rufaida Ashiela Safira Amalia, Gradis Anak Agung Istri Sri Wiadnyani Andianto Anggara, Andhika Dwi Anggraini, Putri Dian Puspa Anne Carolina Apri Heri Iswanto Arinana Arinana Auliyah, Izzatul Bayu Febram Prasetyo D R Agungpriyono Deded Sarip Nawawi Desi Melianti Devi Armilasari Dewi R Agungpriyono Dewi R Agungpriyono Dudi Tohir Dyah Safitri Edhi Sandra Effendi Tri Bahtiar Ervizal A.M. Zuhud Eva Harlina Evie Nihayah Fauzi Febrianto Fillah, Muhammad Arda Fitrianum, Fadilah Gustan Pari Gustan Pari Gustan Pari Hamidi, Zikri Himmi, Setiawan Khoirul I Nyoman Jaya Wistara I Wayan Darmawan Idris N Iskandar IETJE WIENTARSIH Imam Wahyudi Indrawan, Imam Wahyudi Ina Winarni, Ina Intan, Yulice Soraya Nur Irdika Mansur Irmanida Batubara Istie Rahayu Itje Wintarsih Iwang Yusuf Izza Firdausi Hadiyanto Juliasman Juliasman Khamareta, Vita Ayu Tegar Khatami, Muh Najib Riza Kholiyah Kholiyah Kosei Yamauchi Kurnia Sofyan L N Sutardi Laela N. Anisah Laela Nur Anisah Livia T Amalia Lubis, Muhammad Adly Rahandi Maharani, Eisha Ira Manggar Arum Aristri Mardho Tillah Mardho Tillah Mardho Tillah, Mardho Maulana, Muhammad Iqbal Mayangsari, Citra Primavita Menik Sahariyani Milano, Rafi Yusuf Muhammad Adly Rahandi Lubis Muhammad Fadli Muhammad Hanafi Muhammad Iqbal Adi Baskara Muhammad Iqbal Maulana Naresworo Nugroho Nastavia, Chika Ngatno Ngatno Nirwana, Disna Laura Cahya Nopen Meisaroh Nugraha, Arifin Budiman Nur Azizah Nurhaliza, Nimas Putri Prasetijono, Purwito Soegeng Prayogo, Yanico Hadi Putri, Diah Anggun Febriana Rahma, Vira Fadhila Rahmawati, Anindya Intan Rahmi Utami Ramadhani, Hesa Haidar Regita Pramesti Riki Andika Rinawati Romi Irka Putra S Priambodo Saat Egra Saharda, Nadylla Mifta Ulrahmi Salina Febriany Santosa, Agus Dwi Aji Sari, Ratih Afrida Lismana Setyo Trisnadi Silmi Mariya Siti Aisyah Siti Maemunah Siti Nurjanah Siti Sa&#039;diah Siti Sa'diah Sri Familasari Subangkit, Mawar Suparmi Suparmi Syamsul Arifin Tasyahuri, Syabila Aldiffah Tengku Muhammad Renzy Hariz Tohru Mitsunaga Umi Cahyaningsih Vetnizah Juniantito Wahyu Hidayat Wahyu Hidayat Wahyuningrum, Maeda Wahyuningrum, Maeda Wasrin Syafii Wibowo, David Adi Wilis Wiryawan Yanico Hadi Prayogo Yuliana, Kumala Putri Yusuf Sudo Hadi Zamzami, Romi