Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Budiman Nasution, Habibi Azka Nasution, Kahirul Amdani, Muhammad Kadri, Silvia Dona Sari, Eviyona Laurenta Br Barus, Dina Alfariza Nst, Laili Suryani, Iswari Afala Ordinary Portland Cement (OPC) used in building structures has a negative impact. The presence of CO2 emissions produced becomes very dangerous. To reduce this impact, materials that are more environmentally friendly are used. Silica Fume and liquid carbon dioxide (CO2) are among them. In this study, silica fume and liquid carbon dioxide were used as a substitute for cement. The effect of the stiffness of the two materials and the earthquake lateral load was tested by looking at the response of the high-rise building. Through numerical simulations, we compare the mode shape, displacement of the structure, and the sheer force experienced by the structure.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Budiman Nasution, Kahirul Amdani, Muhammad Kadri, Habibi Azka Nasution, Silvia Dona Sari, Eviyona Laurenta Br Barus, Dina Alfariza Nst, Laili Suryani, Iswari Afala . The use of Ordinary Portland Cement (OPC) for building structures should be reduced because it can produce harmful CO2 emissions. The use of environmentally friendly materials could be the solution. Liquid carbon dioxide (CO2) is one of these material innovations. In this study, the liquid carbon dioxide was used as a substitute for OPC. The use of this material will affect the rigidity of the multi-story building structure. The effect of the stiffness variable value is tested by looking at the response of multy storey buildings during an earthquake. By using the finite difference method, the response of the multi-story building structure is analyzed through mode shape, structural displacement, and shear force.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Tukiran Surbakti, Surian Pinem, Lily Suparlina The current work investigates the impact of MOX fuel introduction on AP1000 neutronic characteristics. The MCNP code with new silicon carbide cladding and the AP1000 core with three 235U enrichment zones (2.35%, 3.40%, and 4.45%) were used to perform the neutronic computations. The outcomes demonstrated that the simulated model for the AP1000 core complies with the optimization requirements as a Westing-house reference. The results which included: effective multiplication factor, keff, and excess reactivity were calculated and compared with the available published results. The keff in the cold zero power was found to be AP1000 Zircaloy, SiC, FeCrAl, and SS-310 cladding are (1.20685+/-0.00028), (1.21170+/-0.00028), (1.14435+/-0.00027), and (1.12432+/-0.00028). The excess reactivity is 17.11%, 17.47% 12,61%, and 11.06% with the MOX fuels, respectively. These numbers line up with the keff value of 1.205 given in the AP1000 Design Control Document for the UO2 fuel core. However, the results are positive and support the AP1000 reactor core's design and efficient modeling as being safe operation.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Janter Pangaduan Simanjuntak, Bisrul Hapis Tambunan, Junifa Layla Sihombing, Riduwan Riduwan This study aimed to design a condenser for a special application of condensing the vapor of pyrolysis process of hydrocarbon-based material such as plastic and biomass into liquid form or pyrolytic oil. Numerous condensers have been available in the market. However, a condenser cannot be selected and utilized directly for pyrolysis vapor condensation purposes. Before doing selection, the condenser must be designed first to meet the heat transfer requirements. In this work, the condenser was designed based on thermal analysis and validated with numerous published experimental data and the pyrolytic characteristics from related industry. A theoretical model is formulated for describing condensation of the pyrolysis vapor in the condenser to determine heat transfer requirement and the rate of condensation obtained. The effect of operating parameters such as cooling water rate in liters per minute (LPM) and temperature on the condensation rate was examined through an iterative procedure which rely to the heat transfer rate and the allowed pressure drop in the condenser. In this study, it was obtained that the highest cooling load is obtained when the flow rate of cooling water is 1.95 LPM. It was also obtained that the condenser effectiveness decreased of about 29.3 % with the ranges of cooling flow rate from 1.3 to 2.6 LPM
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Harapan Marpaung, Alamta Singarimbun, Wahyu Srigutomo, Ni Ketut Lasmi Thermoelectric-based on Thermoelectric Generator (TEG) is a method of converting heat energy into electrical energy directly if there is a temperature difference (∆T) between the hot side temperature (Th) and the cold side temperature (Tc) of the TEG. Compared to conventional energy conversions such as steam turbines, this thermoelectric technology has no moving parts, is compact, quiet, highly reliable, environmentally friendly, and operated for long periods with minimal maintenance. This study aims to develop TEG technology as a means of converting heat energy from geothermal sources, especially those with medium and low temperatures (< 180 °C). The method used in this research is to conduct experiments to obtain the ideal TEG characteristics for use in medium and low temperature geothermal conditions. To achieve this goal, a characteristic test was conducted for five types of TEG with criteria including a maximum operating temperature of 200 °C. The parameters that measured in this experiment are temperature T, voltage V, current I and electric power P. Based on data, the results is TEG1-241-1.4-1.2 is the most optimal power that produce output power 6.5 Watt at 150 °C.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Saharudin, Novy Hapsari, Tita Aisyah, Galuh Fajar Sunarto Putra Mukherjee and friends had written that the fermentation process of tempeh can increase the nutritional value, organoleptic properties, and digestibility of the product, as well as increase the bioavailability of proteins, carbohydrates, and lipids, in easily digestible sizes. Therefore, fermentation process needs more attention to produce best quality tempeh. In order to automate the industry process on making tempeh, the incubator for fermentation is designed to meet market needs so that it can be implemented by tempeh industry. The time required for the conventional tempeh fermentation process ranges from 24 hours to 40 hours and can be exacerbated by the transition season (uncertain temperature). The study aims to reduce human dependence on controlling temperature and humidity as well as shorten the time in the fermentation process and reduce failures in making tempeh by designing a tempeh incubator and applying the concept of the internet of things (IoT) using MCU32 Node and firebase as a real time database. To apply the IoT-based tempeh incubator, there are several discussions in this paper, namely control systems, temperature sensors, humidity sensors, android, Arduino Mega 2560 and IoT architecture. temperature and humidity sensors as leading devices that are in direct contact with real conditions using a DHT22 sensor which has 2 functions at once to read temperature and humidity then sent to Arduino Mega 2560 with C++ language as reference data to turn on/off (6 Fan 12 V Dc and 2 Spiral Heaters). This control process is configured fully automatically by the system. After going through the testing stages that the temperature and humidity control will work when the room temperature is below 31°C and above 33°C. From the results of testing the tempeh incubator, the average temperature is 31°C and humidity is 84.33% and the time required for tempeh fermentation is 20 hours, which is 4 hours faster than conventional process.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Vincentius Riandaru Prasetyo, Yudhistira Anggara Jayadinata, Naufal Muflih Ramadhan Hydroponics is an agricultural cultivation system without using soil media. Hydroponics is an agricultural activity carried out using water as a medium to replace soil. Hydroponics emphasizes meeting the nutritional needs of plants through the flow of water. If nutrients are given through fertilizer in soil media, then in hydroponics, the nutrients are dissolved and flow through water. The concentration of nutrients that dissolve in water will affect the high and low pH of the water. The pH level in the water will affect the development and growth of plants. In addition, air humidity can also affect plant growth, especially for plants grown in a greenhouse. Therefore, special attention is needed to maintain the pH level in the water. The particular concern is when is the right time to replace the water or add nutrients to the water. However, the large land area and the limited number of workers owned by the partners make it difficult for them to monitor the development and growth of existing plants. Therefore, a sensor will be installed in the hydroponic system to monitor the plant's development and growth. Based on the results of the tests and evaluations, the three hydroponic monitoring sensors, which include the pH sensor, nutrient solution concentration sensor, and air humidity sensor, may be properly programmed on the Arduino. The measurements between sensors and manual measurements showed an error value of 0.36% for pH measurements, 0.56% for EC measurements, and 0.42% for humidity measurements.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Benrad Edwin Simanjuntak, Marhaposan Situmorang, Syahrul Humaidi, Marzuki Sinambela Beef and lamb each have a distinctive aroma. Classification of beef and lamb based on the aroma of the meat using an electronic nose. This electronic nose uses a series of sensors consisting of 6 (six) pieces and uses a Conducting Polymer. This polymer has a high resistance so it is widely used as an insulator. However, this resistance has a certain limit where the polymer surface will turn into carbon and conduct electric current if exposed to excessive electric charge. This research was conducted by taking samples of beef and lamb as test samples where these meats were placed in a closed container at room temperature. Data is taken alternately every day to find out the odor of each meat where on the first day data is taken from the odor of beef and on the second day data is taken from the odor of lamb. A two-layer neural network consisting of six input nodes and three output neurons is trained using the Kohonen algorithm with the training process completed in 31 iterations. The test was carried out 20 times for each exposure to steam from the odor of beef and lamb which was carried out alternately. The percentage of success of the system is reaching 90%.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Frederika Rambu Ngana, Ruth Aryati Rue Dima, Laura Anastasi Seseragi Lapono, Andreas Christian Louk Medical visualization requires interdisciplinary groups of researchers to analyze and explore medical data. Visualizing medical data can use open-source visualization software to avoid administration effort in medical visualization collaboration works. Visualization Toolkits (VTK) is a free, open source for medical visualization. VTK has been used to reconstruct medical images. However, few studies have used VTK to visualize DICOM data from Computed Tomography (CT) scan images using local hospital data in Indonesia. This study aims to reconstruct DICOM data from CT scan of the local hospital in Kupang city, Province Nusa Tenggara Timur, Indonesia. We used VTK to visualize the CT scan images of the head, thorax, and abdomen into two-dimensional (2D) and three-dimensional (3D) images. The DICOM data was visualized first in 2D, and then it was reconstructed into 3D using ray casting and volume rendering algorithm on VTK 8.2. The VTK was built on C++ and Visual Studio 2017. We have successfully demonstrated VTK to visualize 2D and 3D CT scan data from the local hospital in Kupang city. In the future, VTK has the potential to be used by a group of researchers using local hospital data in Indonesia to visualize 2D and 3D CT scan images.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Arna Fariza, Wiratmoko Yuwono, Reesa Akbar, Rengga Asmara, I Gede Kresna Putra Aryawan The high number of dengue fever in Indonesia is a severe problem that affects the health of the Indonesian people. Coupled with the pandemic conditions that limit all movements of various groups due to social distancing, starting from health volunteers who must serve the community related to Covid-19. Routine inspection of mosquito larvae in every household must still be conducted to avoid the breeding of these mosquito larvae. Thus, an automatic and independent mosquito larva recognition system is needed from images taken via mobile devices that make it easier for each family head to identify areas of the home environment whether there are mosquito larvae or not. This paper proposes a new approach to larva recognition using convolutional neural network based on the TensorFlow library. The TensorFlow Serving and TensorFlow Lite were evaluated to get the best model with limited memory so that it can be used on mobile devices. The system classifies photo images into 2 labels, namely larvae or not. The result of this system is the presence or absence of mosquito larvae from the image. The TensorFlow Serving model produces an average testing accuracy of 96.1%, which is better than TensorFlow Lite of 90.1% in testing various conditions. The developed convolution neural network model produces a better model than the previous method.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Novi Sofia Fitriasari, Willdan Aprizal Arifin, Ayang Armelita, Luthfi Anzani, Afrizal Dzikrillah, Aulia Maulida Rahmah, Abdillah Aditama Sujana, Hilda Maela Kisty, Salsabila Putri Fahriza The need for data on marine resources is increasing, Indonesia as one of the world's maritime countries plays a big role in this. The successful application of big data on marine resources is not only seen from the technology used in it but it is also must related to other system components. A qualitative approach is used in this study to produce a big data model that can be applied to marine resources. This research produces a big data model from the perspective of a Knowledge Management System (KMS) which consists of four elements or layers, namely organization, Big Data Process and Technology Information, and people as users. The integration of these four elements is expected to promote economic transformation and knowledge in the marine and fishery sectors.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Libianko Sianturi, Timbangen Sembiring, Kurnia Sembiring, Syahrul Humaidi In this work, urethane dimethacrylate (UDMA) was used as dental resin as an non-toxic alternative to Bisphenol A-glycidyl methacrylate (Bis-GMA). Additionally, UDMA combine with triethylene glycol dimethacrylate (TEGDMA) monomer with various concentration ratio, meanwhile camphorquinone (CQ) and diphenyl-(2,4,6-trimethylbenzoyl) phosphine (TPO) as photoinitiator. First, UDMA:TEGDMA with ratio of 40:60, 50:50, 60:40, 70:30 and 80:20 wt.% was prepared. Second, the solution was ultrasonic for 15 min with introduction of CQ and TPO (1:2 wt%). Third, irradiation of UV LED with wavelength of 375 nm for 2 min to initiate polymerization reaction of monomers. Scanning electron microscope (SEM), fourier transform infrared spectroscopy (FTIR), thermogravimetric analyzer (TGA) and mechanical properties were used to investigate the morphology, chemical bonding of polymerization reaction, decomposition temperature and tensile strength. Based on our findings, we found that that UDMA:TEGDMA ratio of 50:50 wt% demonstrates uniform and smooth surface, high degree of conversion, and good mechanical strength, which is promising for dental resin.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Ni Nyoman Rupiasih, Ria Yuliani, Dewa Ayu Pranastia, Made Sumadiyasa, Wayan Supardi, I Made Sukadana, Maykel Manawan A Research has been carried out on the manufacture and characterization of Polyvinyl Alcohol (PVA)/Chitosan composite nanofiber membranes using electrospinning technique which addressed for wound dressing and antibacterial efficacy. The electrospun composite nanofiber membranes were made with various volume ratios of PVA:Chitosan, namely 1:9, 2:8, and 3:7, which were named P9K1, P8K2, and P7K3 respectively. The electrospinning was performed at a voltage of 10 kV, the distance between the nozzle tip to the collector was 10 cm, a flow rate of 1 µl/h, at room temperature, a relative humidity (RH) of around 63%, and the spinning time was 3 h. Their physical and chemical were characterized by FTIR, SEM, DMA (dynamic analytical analysis), and antibacterial activity. These characterization results indicated that adding chitosan greatly affects the quality of the nanofiber membranes formed and their potential applications. The addition of chitosan produced nanofiber membranes with a larger diameter, shorter fibers, and more beads and droplets. The functional groups in the nanofiber membranes experienced a wavenumber shifting and increased transmittance which was relatively high compared to pure PVA nanofiber membrane (P10K0). Only the P8K2 met the standard for medical materials, with UTS and PTP of 2.73 MPa and 19.03% respectively. Also, it had antibacterial efficacy against E.coli and S. aureus of 16.90% and 8.87% respectively.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Muhamad Mustangin, Bambang Purwantana, Chusnul Hidayat, Radi Radi – The research on CPO as an insulator to replace mineral oil. The CPO was heated using vacuum distillation technology. The parameters used are the temperature of 110°C to 170°C with the difference of 10°C and the vacuum pressure of 0 mmHg to-600 mmHg with the difference of 200 mmHg. The highest breakdown voltage measurement of 49 kV (170°C-600 mmHg), the lowest viscosity is 20 mPas (170°C-600 mmHg), the lowest water content was obtained at 30 (160°C-400 mmHg). The vacuum pressure and temperature rise causes the high breakdown voltage and viscosity are high and the water content is low. The relationship between vacuum pressure and breakdown voltage is y = 5.8 x + 7 with R2 of 0.9397, the viscosity is y = -2x + 35.67 with R2 of 0.9231 and the water content is y=-7.25x2 + 22.95x + 106.75 with R2 of 0.9945.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Kahar Muzakhar, Ramdhan Putrasetya, Azizah, Farah Salma, Rudju Winarsa, Siswoyo Amylase is essential in the industrial sector, but there are some challenges with its low reusability efficiency. The catalytic activity of the amylase can be affected by using an activated carbon matrix as an immobilization technique. In this study, we characterized the purified amylase of Aspergillus niger ICP2 and immobilized it to activated carbon. Amylase production from A. niger ICP2 was performed throughout a 7-day incubation. After partial purification, two amylase fractions were generated, including 90% saturation ammonium sulfate precipitation, a 10-kDa hollow fiber dialysis column, and anion exchange chromatography. Thin-layer chromatography analysis showed the presence of glucose in fractions I and II, indicating glucoamylase activity. Both fractions had optimum pH and temperatures at 4.5 and 70°C, respectively. Fraction I was stable at acidic pH (3.5-5), while the stability of fraction II was in the range of acid to base (4-7.5) after incubation for 1 hour at 37°C. Both fractions displayed the same pattern of temperature stability (30-50°C) when incubated for 1 hour at optimum buffer. Activated carbon was used to immobilize amylase fraction II, which demonstrated the ability to hydrolysis the starch up to five times with a reduction in the activity of 50.4%. These results showed promising hydrolysis reusability by amylase immobilized using activated carbon.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Rudju Winarsa, Ramdhan Putrasetya, Azizah, Farah Salma, Siswoyo, Kahar Muzakhar The future applications of amylase have sparked the interest of several industries, resulting in the discovery of possible amylase-producing microbes. Aspergillus niger ICP2 was an indigenous fungus isolated from coffee pulp that shows amylolytic activity after growing on a soluble starch agar. In this study, we optimized the production and successfully purified the amylase from Aspergillus niger ICP2. Amylase optimization production was performed for a 7-day of incubation under submerged fermentation. The amylase activity was measured using the iodin method, and the total protein was quantified spectrophotometrically at 280 nm. Purifying amylase crude extract conducted such as ammonium sulfate precipitation, dialysis, and anion-exchange chromatography. Amylase was maximally precipitated at 90% saturation, followed by dialysis on a 10 kDa column, increasing specific activity up to 12.17 U/mg and purity multiples of 9.31 times. Two peaks of amylase activity were formed when the dialyzed amylase was loaded onto anion exchange chromatography with specific activities of 14.47 U/mg (fraction I) and 32.73 U/mg (fraction II). The increase in specific activity and purity fold indicated that the amylase purification process was successful.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Makmur Sirait, Karya Sinulingga, Nurdin Siregar Zeolite Pahae an adsorbent material by activating physical and chemical processes has been synthesized. The methods used are ball milling and coprecipitation methods. Zeolite was ball milling and activated, then sieved using 100 mesh and 200 mesh sieves. To obtain nanozeolite, a ball mill and coprecipitation were carried out to obtain a size of 9.08 nm. The X-Ray Diffraction (XRD) results showed that the zeolite structure is tetragonal. Zeolite is used as a heavy metal adsorbent. Atomic Absorption Spectroscopy (AAS) method can determine how much zeolite can absorb heavy metals. The results of the AAS test showed that the absorption of nanozeolite to heavy metals was Pb of 99.81%; Fe is 99.99% and Mn is 96.87%. The absorption of 200 mesh zeolite is Pb of 99.45%; Fe is 99.99% and Mn is 99.61%. The absorption of 100 mesh zeolite is Pb of 99.66%; Fe is 99.98%, and Mn is 99.68%. From these results obtained zeolite particle size affects the absorption of heavy metals.
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Dennis Mitchel, Thalia Sweetenia Sugianto, Patrick Anderson Sunaryo, Matthew Arian, Johan Sukweenadhi, Wina Dian Savitri, Popy Hartatie Hardjo Hydroponic is a farming method that utilizes water, minerals, and oxygen. This study aims to find out the best nutrition towards growing curly lettuce (Lactuca sativa L.) by using the NFT (nutrient film technique) hydroponic system integrated with sensors to measure EC concentration of nutrients, pH acidity, and RH air humidity. This study also incorporates a grouped randomized design with two nutritional treatment (code P1 and P2), with 20 replication. The results showed that nutrition P1 producing a better variable compared to nutrition P2 in terms of plant length, quantity of leaves, length of root, total mass of fresh plants, total mass of plant crown, total mass of fresh roots, and chlorophyl content. Key words: NFT hydroponic system, nutrition, curly lettuce
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Gloria Sirait, Ashar Hasairin, Syahmi Edi Mycorrhizal is a the symbiotic association between the roots of higher plants and the mycelium of certain fungi. Mycorrhizal has benefits for improving plant nutrition and increasing growth, as biological protection, involved in the Bio-Geo-Chemical cycle, increasing nutrient absorption from the soil to increase plant resistance to extreme drought and humidity. Research on mycorrhizal spores was carried out in 3 places with high levels of mycorrhizal diversity, humid areas, and lush trees, namely in the forest of the Medan State University campus, Jl. Williem Iskandar, Kec. Medan Tebung City of Medan. This research is limited to knowing the diversity of mycorrhizal spores in the forest of Medan State University. Mycorrhizae observed on the roots of Swietenia macrophylla. Observations focused on the morphology of mycorrhizal spores observed under a microscope. The results showed that the mycorrhizal that were successfully identified and observed around the Medan State University Campus Forest were Gigaspora sp. 1 (10 x 40), Gigaspora sp. 2 (10 x 40), Acaulospora sp. 1 (10x40) Acaulospora sp. 2 (10 x 40), Glomus sp. 1 (10 x 40), Glomus sp. 2 (10 x 40), Glomus sp. 3 (10 x 40), Glomus sp. 4 (10 x 40), Glomus sp. 5 (10 x 40), Glomus sp. 5 (10 x 40), Gigaspora sp. 3 (10 x 40).
Please help us test our new pre-print finding feature by giving the pre-print link a rating. A 5 star rating indicates the linked pre-print has the exact same content as the published article.
Abstract: Publication date: 2 March 2023 Source: Advances in Science and Technology Vol. 126 Author(s): Itra Hariyadi, Fauziyah Harahap, Melva Silitonga Orchid Cattleya sp. has a very high commercial value in the market both locally and internationally. Although the price of the orchid tends to be expensive, the value it has is much more expensive. So cattleya is always a top priority for hobbyists and collectors [1]. Cattleya is one of the orchid genera that have flowers with large sizes and is known as "The Queen of Orchids" because it has the beauty of color variations in its flowers [2]. In addition to having beauty in its flowers, bright flower color, and fragrant smell, Cattleya Orchid in general has a large flower size compared to other orchid flowers [3]. This study aimed to determine the best combination for callus growth from the orchid leaf explant Cattleya sp. with the combination of media using the ingredients MS + 6-Benzyl Amino Purine (0; 0.3; 0.6 ppm) and 2.4 Dechlorophenoxy Acetic Acid (0; 1; 2; 3 ppm) with three repetitions for each treatment. The data from the study showed that the best concentration to spur the growth of the callus of the explanatory orchid leaves of Cattleya sp. At the treatment of 2.4-D 1 ppm + BAP 0.6 ppm with a percentage of callus formed about 60% with a green callus color and compact callus texture and medium callus growth (++).
Subscription journal
