bluuebunny/crossref_metadata_2025_split huggingface dataset:
Effect of Pulsating Flow on Surge Frequency of a Turbocharger Compressor
Authors: Asanaka Y , Kobayashi K , Sakakibara M , Itagaki Y , Nakamura Y , Miyagawa K 
Published: May 2021

Abstract
Turbocharger compressors operate under pulsating flow due to continuous opening and closing of engine valves placed downstream of the compressor but exhibit a hysteresis loop deviating from steady characteristics. As the flow in a compressor is throttled, both pressure and flow discharge unstably oscillate. The instability is known as surge and it affects not only the compressor itself but also its whole engine-turbocharger system. For estimating the stable operation range, partial flow tests of a turbocharger compressor under pulsating flow were conducted. Using a compressor test apparatus with a pulsating flow generator and a tank whose capacity can be changed, the flow rate was controlled by a valve. Under steady flow, surge hysteresis loops caused by oscillating pressure and flow rate were obtained in each rotational speed. By Fast Fourier Transform (FFT) of pressure signals, the occurrence of surge with different frequencies was confirmed depending on the tank capacity. Next in pulsating flow tests, a compressor rotational speed is fixed, and pulsating frequencies given by the pulsating flow generator are changed. The obtained surge frequencies were different from those in steady flow tests. Especially, it is likely to be drawn to the frequency that is equal, two times and a half rate of the pulsating frequency. Numerical computation with one-dimensional calculation is conducted to investigate such a phenomenon.
Seed vigor testing of coffee [Coffea sp.] to gibberellin hormone [GA3] concentration and water temperature differences
Authors: Suhendra D , Efendi S , Aisyah S , Saragih S H Y 
Published: May 2021

Abstract
West Sumatra is one producing coffee region in Indonesia that contributes to the economy in Indonesia because unstable need expand. Optimizing generative propagation of coffee plants with gibberellin hormone treatment and different water temperatures on coffee seed germination stage. The research was conducted at the Seed Technology Laboratory Faculty Agriculture, Andalas University from July to September 2020. Research methods used randomized block design [RBD] with 2 treatments namely concentration hormone gibberellin and immersion water temperature differences. Measurement parameters are maximum growth potential [%], First Count Test [FCT] [%], and Index Value Test [IVT] [days]. All parameter observation results showed a significant effect on the treatment of gibberellin hormone concentration and water temperature treatment. G4S1 sample [the combination of 200 ppm gibberellin hormone concentration and room water temperature treatments] has resulted as the best treatment for all parameters. Respectively, 0.79 days for index value test, 76.67% for the first count test, and 85% for the maximum growth potential parameters.
Physicochemical characterization of starch from seven genotypes banana in West Sumatera
Authors: Syukriani L , Yunita R , Jamsari J 
Published: May 2021

Abstract
Banana fruit has the potential to be developed as a functional food. For that reason, a detailed characterization of its fruit is necessary. We collected seven banana local genotypes that are widely cultivated in West Sumatra, Indonesia. This study is aimed to determine the physical characteristics and functional properties of banana starch. The analysis was carried out for its starch and proximate variables, XRD, XRF, and RVA. The results showed that the average water content of the starch from the 7 types bananas is ranging from 8.3 to 15.8%, while their ash content is ranging from 0.5 to 2.29%. Protein is in a range between 1.28 to 1.58%, while the fat content is ranging from 0.12 to 0.7%. The crystallinity structure types A involving Pisang Sipuluik, Randah, and Gadang genotypes. Genotype Rotan, Tinalun, and Jantan are classified as type B. While, Pisang Mas is classified as type C. The average starch gelatinization temperature from all 7 genotypes ranges from 70°C to 75.7°C.
Genetic parameters of F6 upland rice with lodging resistance derived from landraces x national varieties
Authors: Mustikarini E D , Prayoga G I , Santi R , Hairul H 
Published: May 2021

Abstract
Developing rice varieties with lodging resistance is important to maintain yields. The selection of lodging resistance lines should be related to genetic parameters to determine the genetic character of plants. This study aimed to determine the variability, heritability, and genetic advances of 6th generation [F6] upland rice “padi gogo” and selected the promising lines that can be used as candidates for new superior varieties. The research was held in Experiment and Research Garden, Universitas Bangka Belitung. The study used an experimental method with a randomized block design. The treatment consisted of 10 F6 genotypes, 4 parental plants, and 3 check plants, with 2 replications. Quantitative data were analyzed by calculating the values of variability, heritability, and expected genetic advance. The results showed broad phenotypic variability and high heritability for all characters. The expected genetic advance showed low criterion except for the number of grain filled. The F6 lines that can be used as candidates for new superior varieties are 23A-56-20-07-20 and 23A-56-22-20-05 lines that have better lodging resistance scores and higher production than parental and check varieties.
Study on chemical and biological properties of paddy soils in Nagari Taram, Harau District, Lima Puluh Kota Regency
Authors: Emalinda O , Juniarti J , Darfis I , Ramayani Y , Putri D D 
Published: May 2021

Abstract
Intensive cultivation of paddy soil without giving rest to the soil for years will affect the chemical properties and the presence of microorganisms in the soil. This study aims to examine some of the chemical properties of paddy soil such as pH, CEC, Total organic carbon, exchangeable bases, Total N, Available P, silica content and calculating the population and respiration of microorganisms at various slopes. This research is located in Nagari Taram, Harau District, Limapuluh Kota Regency. The study used a survey method in four stages, namely preparation, pre-survey, main survey and sampling, laboratory analysis and data processing. Samples were taken on rice fields that have been cultivated for approximately 100 years at a depth of 0-20 cm at 5 slopes those are 0-3%, 3-8%, 8-15%, 15-25% and 25-45%. Based on the results of the data analysis it is known that differences in slope affect the chemical and biological properties of the soil. The higher the slope, the decreased several soil chemical properties such as pH, C-organic, P-available, total N, CEC and silica. Soil microorganism populations varied for each slope. The highest bacterial and fungal populations were found on land with a slope of 0-3%, while the highest respiration of soil microorganisms occurred on lands with a slope of 3-8% that is 13.8 mg / kg / day.
The soils physicochemical properties of monoculture land in several slopes at Northern Areas of Mount Talang
Authors: Harianti M , Junaidi J , Emalinda O , Herviyanti H , Azizah A , Pulunggono HB 
Published: May 2021

Abstract
In the northern area of Mount Talang with some steep slopes (more than 30°), the local community implements an intensive monoculture agricultural system that can accelerate land degradation in the long term. Study was aimed to examine the soils physicochemical properties of monoculture land on several slopes in the northern foothill of Mount Talang. Survey method and soil sampling were implemented in this research, using a purposive random sampling toward the monoculture land on slopes> 45%, 25-45%, 15-25%, 8-15%, and the forest as control, at 0-20 cm and 20-40 cm depth. The results revealed that the soil texture that dominates the forest and monoculture cropping system is sandy loam. In addition, soil water content increases by the increased soil layer depth as well, with highest level observed in monoculture cropping system 25-45% (73.72%). Soil bulk density ranging from 0.4-0.6 g / cm3, or have the same tendency at both soil depths. The total pore space of forest land and monoculture agricultural land is 75%, categorized as high. The highest soil organic C content was found in monoculture agricultural land with a slope of >45%. The value of pH for all land uses was 5.15-5.29 on acid criteria. The cation exchange capacity was above 40 me / 100g and the total N content is 0.8-1.6%, so both of them are categorized as very high. Based on the data, the soils physicochemical properties of monoculture cropping system on several slope classes similar to the forest. The land quality for monoculture cropping system is still maintained, even though it is on the upper slopes of the foothill of Mount Talang. However, in the monoculture cropping systems will trigger the loss of soil organic matter, so the addition of soil organic matter content should be prioritized, especially in the agricultural land management of this area.
The improvement of paddy soil chemical properties following the application of rice husk derived biocharin the Regency of Sijunjung
Authors: Hermansah  , Sandi N , Naspendra Z 
Published: May 2021

Abstract
The district of Dharmasraya, Sijunjung and Pasaman Barat are the three main locations of illegal gold mining in West Sumatra. This kind of activity triggers a lot of land-use changes and the loss of agricultural land within those areas and creates environmental problems as well. Decreasing agricultural land will bring a significant impact on food availability within the region. To protect the scarcity of food, we conducted remediation of ex-gold mining land on those three locations by using biochar made from rice husk. This study was carried on at Batu Manjulur village, Kupitan sub-district in Sijunjung for four months, where soil sample was analyzed at Soil Science Department, Faculty of Agriculture, Andalas University. The experiment use 6 level of biochar application, run from A [without biochar]; B [fulfil of 2% soil organic matter content [SOM]]; C [fulfil 3% SOM]; D [fulfil 4% SOM], E [fulfil 5% SOM] and F [fulfil 6% SOM] with three replication. The result shows the application of rice husk-derived biochar increased soil quality including the chemical properties of the soil and improving nutrient retention and land productivity.
Improvement of nutrient status in ex-gold mining land with the application of rice terra preta biochar technology
Authors: Gusmini  , Adrinal  , Yaherwandi  , Putri E L , Panji R 
Published: May 2021

Abstract
This research on the escalation of nutrient status aims to determine the effect of giving Terra Preta Biochar Padi (Tetadi) on ex-gold mining land to P-available land in Nagari Padang Sibusuk Sijunjung Regency, West Sumatra. Soil samples were taken from the former gold mining soil with a depth of 0-20 cm randomly. This research was conducted using a completely randomized design with 6 treatments and 4 replications consisting of control (A), Tetadi 10 tons / ha (B), Tetadi 15 tons / ha (C), Tetadi 20 tons / ha (D), Tetadi 25 tonnes / ha (E), and Tetadi 30 tonnes / ha. The results showed that giving Terra Preta Biochar Rice to ex-gold mining land could increase the highest available P of soil in the treatment of rice Terra Preta Biochar 30 tonnes / ha with the results of the 5% DMRT statistical test very significantly different from the control treatment and 10 tonnes / ha and 15 tonnes / ha. Soil pH also showed the highest increase in the treatment of 30 tonnes / ha with a pH value of H2O of 5.7 and followed by a pH of KCl with a value of 4.6 and statistical test results showed that the treatment of 30 tonnes / ha was also very significantly different from control and treatment.
Utilization of Arbuskular Mikoriza Fungi [AMF] for growth and ready to release of three genotype gaharu [Aquilaria spp.]
Authors: Satria B , Fadli M , Herawati N , Aprisal  
Published: May 2021

Abstract
The agarwood sapling has low viability or about 47 % cause undeveloped roots. This problem was overcome through the application of Arbuscular Mycorrhizal Fungus [AMF] at the acclimatization stage. AMF has the capability to improve root growth and coverage area, enabling a better capacity to absorb water and nutrients through its hyphae. to know the effective dose for enhancing the growth of agarwood saplings is the goal of this research. The genotypes used in this study were Aquilaria malacensis and Aquilaria microcarpa. The AMF doses were 7.5; 15; 22.5, and 30 gr/polybag. Saplings were acclimatized in soil that had been supplemented by husk charcoal and organic fertilizer Super UPPO [product of Andalas University CSR Program 2017]. The observations including the number of the viable sapling, the height, the leaf number, the leaf length, the root number, the percentage of the AMF infection, and the ready-to-release sapling. The best performance was an application of 30 g per polybag. These doses infected 70% of root surfaces, and 90% of saplings were categorized as ready-to-release saplings.
Role of the C4 protein PepYLCV in viral symptom determinant: In silico approach
Authors: Nova B , Cania D , Hidayati R , Runifah T , Chaniago I , Suliansyah I , Jamsari J 
Published: May 2021

Abstract
The C4 protein of the monopartite begomovirus pepper yellow leaf curl virus [PepYLCV] plays a major role in the pathogenicity of plant virus infection. Complement gene [C4], in virus, is overlapped with complement gene 1 [C1] or known as Replicase gene [Rep]. The C1 protein is directly involved in virus DNA replication, but not the C4 protein. Recent studies suggested that the C4 is a viral symptom determinant but the molecular mechanism has not been elucidated. In this study, the C4 gene of the novel PepYLCV Alahan Panjang was isolated. To further investigate the role of C4 in symptom determinants, in silico approached was used. Computational modeling of C4 was constructed with homology and ab initio modeling software and the model was checked with Ramachandran Plot. The optimum model of the C4 was used in the surface analysis to predict binding sites and key residues. The mutant structure of the C4 protein and its prospect for CRISPR-Cas9 utilization are discussed.
The diversity and abundance of butterfly [Lepidoptera] in several urban green spaces of Malang city
Authors: Azizah A , Mustafa I , Gama Z P , Leksono A S 
Published: May 2021

Abstract
Urban green spaces have become one of the butterfly habitat remnants, which decreased by the expansion of cities and urbanization. In this study, we analyze the diversity and abundance of butterfly communities in several urban green spaces of Malang City. We used a scan sampling method along the transect line in five study sites, namely, Taman Singha Merjosari, Kebun Bibit Mojolangu, Taman Slamet, and Alun-Alun Malang. The composition of butterfly communities was analyzed regarding the number of individuals, species richness, Shanon Wiener diversity index, importance value index, similarity cluster and analysis of CCA to determine the correlation of abiotic factor and butterfly community. A total of 1284 individuals, 38 species which belong to 4 families with Leptosia nina as the most dominant species. The highest diversity index was found in Taman Singha Merjosari. According to the diversity index, all four urban green spaces in Malang city were on a moderate level (index value between 1 to 3). This attributed to the fact that butterfly diversity in urban green spaces still had not been completely disturbed yet.
YIL counteracts ghrelin-inhibited insulin release in pancreatic islets of langerhans
Authors: Rita R S , Dezaki K , Yada T 
Published: May 2021

Abstract
Ghrelin is a peptide hormone that is produced mainly from the stomach. Ghrelin is reported to have many biological functions, such as modulating feeding behavior, energy balance, and glucose homeostasis. This study aimed to examine whether YIL, a ghrelin receptor antagonist, could counteract the effect of ghrelin-inhibited insulin release in the pancreatic islet of Langerhans. This study is experimental research using wild-type C57BL/6J mice [8-10 weeks old]. Islet of Langerhans was isolated by collagenase digestion and the insulin release [ng/islet/h] from the islet is examined by the ELISA method. Data represent means ± SEM and is analyzed by one-way ANOVA. The result showed that 8.3 mM glucose concentration increase insulin release compared to 2.8 mM glucose, respectively [0,393 ± 0,025 vs 0,219 ± 0,022 ng/islet/h]. In the presence of 8.3 mM glucose, ghrelin 1 nM showed a decrease in insulin release significantly compared to 8.3 mM glucose only [0,283 ± 0,001 vs 0,393 ± 0,025, p < 0,01]. In contrast, in the presence of 8.3 mM glucose and ghrelin 1 nM, YIL 1 μM induced insulin secretion [0,386 ± 0,012 vs 0,283 ± 0,001, p < 0,01]. In conclusion, YIL is significantly counteracted ghrelin-inhibited insulin release in pancreatic islets of Langerhans. Furthermore, YIL is one of the candidates for the treatment of type 2 diabetes.
Peanut Crab Pinnotheres halingi, a symbiotic commensal or parasite of Sandfish Holothuria scabra?
Authors: Tresnati J , Yasir I , Aprianto R , Yanti A , Bestari A D , Tuwo A 
Published: May 2021

Abstract
High mortality of sandfish Holothuria scabra broodstock is one of the main problems in sea cucumber hatcheries. Broodstock collected from wild are very difficult to keep alive for long periods because the broodstock readily eviscerate. One cause of evisceration and death is probably due to the presence of peanut crabs Pinnotheres halingi in body cavity as commensal. This study aimed to analyse the mortality of sandfish due to the presence of peanut crabs as commensal. Sandfish samples were collected in Liukang Tupabbiring Utara District, Pangkep Regency in South Sulawesi, Indonesia. During the study, 139 sandfish were observed in rearing nine tanks at the laboratory. The results of this study are not strong enough to state that peanut crab is a symbiotic commensal or parasite. The peanut crab is thought to have turned into a predator when it starved. Peanut crab malignancy as a predator can cause the death of 139 sandfish in 92 days. This is thought to be the reason why broodstock is very difficult to rear for a long period in a controlled tank in a laboratory or hatchery.
Main catch, bycatch, discard catch of set lift net fisheries with Light Emitting Diode (LED) as light attractor in marine coastal waters of Pangkep, Makassar Strait, Indonesia
Authors: Musbir  , Kurnia Muhammad , Sudirman  
Published: May 2021

Abstract
Application of light emitting diode (LED) is considered to energy saving and increased catches in lift net fisheries. Set lift net fisheries in marine coastal waters of Pangkep used compact fluorescent lamp (CFL) but this lamps consumed high energy and fuels. Application of light emitting diode (LED) is considered to energy saving and increased catches in lift net fisheries. The experimental fishing trial was conducted on 22 July-25 August 2020 in marine coastal waters of Pangkep, Makassar Strait, Indonesia. The study using 1 units of set lift net with LED as light attractor. The result of study show that The fishes catch consist of main catch 149.21 kg (67.73 %), by catch 37.28 kg (16.93 %), and discard catch 43.76 kg (19.86 %).
Antimicrobial susceptibility and minimum inhibition concentration of Vibrio parahaemolyticus, Vibrio vulnificus and Vibrio harveyi isolated from a white shrimp (Litopenaeus vannamei) pond
Authors: Yudiati Ervia , Subagiyo  , Azhar Nuril 
Published: May 2021

AbstractShrimp infection byVibriospp. has led to loss of production. To control this bacterial epidemic, people have applied antibiotics. Uncontrolled antibiotic treatments have led toVibriospp. pathogenic-resistance. This study aimed to determine the antimicrobial susceptibility and minimum inhibition concentration (MIC) ofVibrio parahaemolyticus, Vibrio vulnificusandVibrio harveyitowards certain antibiotics. The trials used 10 and 100 ppm concentrations of 10 antibiotics: Chloramphenicol, Gentamicin, Amoxicillin, Co-Amoxiclay, Ciprofloxacin HCL, Azithromycin, Doxycycline, Tetracyclin, Erythromycin stearate and Ampicillin. Paper disc diffusion followed standard methods with incubation for 24 hrs. The inhibition zone was then measured. The results showed that at 100 ppm all antibiotics had activity toward all threeVibriospp. (100 ppm). At 10 ppm, Amoxicillin and Ampicillin did not produce an inhibition zone in theV. parahaemolyticusculture. Antibacterial activity at 100 ppm resulted in inhibition zone diameters ranging from 6.93±0.34 mm (Ampicillin/V. parahaemolyticus) to 31.85±2.5 mm (Gentamicin/V.harveyi). The reduction in bacterial activity ranged from 3.89% (Doxycycline/V. harveyi) to 75.30% (Gentamicin/V.parahaemolyticus). The MIC was determined for six antibiotics. The lowest MIC was ≤0.625 ppm (Gentamicin/allVibriospp.), and the highest was 10 ppm (Doxycycline/V. vulnificus, V. harveyiand Ampicillin/V. vulnificus). This research revealed that some antibiotics, especially Amoxicillin and Ampicillin, were ineffective against Vibriosis, conforming that theVibriospp. isolates used in this research were resistant to these antibiotics.
Blue swimming crab (Portunus pelagicus) megalopa stage seed feed enrichment with beta carotene
Authors: Yusneri Andi , Hadijah  , Budi Sutia 
Published: May 2021

Abstract
This study aimed to increase the nutritional value of natural rotifer and Artemia feed by adding beta carotene sourced from carrots. This research was conducted in May 2020 at the hatchery unit of the Brackish Water Aquaculture Fishery Centre (BPBAP) Takalar. The research design used was a completely randomized design (CRD) with 4 treatments and 3 replications. The experimental animals used were small blue swimming crab larvae (Portunus pelagicus) in the megalopa stage, which were stocked with a density of 5 individuals/L, and kept until they entered the crab stage. The expected output of this research is natural feed enrichment technology for rotifers and Artemia using beta carotene from carrots. The results showed that providing the right frequency of feed after enriching with beta carotene could increase the survival and growth of small blue swimming crab larvae. The optimum feeding frequency for megalopa stage blue swimming crab larvae was 3 times/day.