bluuebunny/crossref_metadata_2025_split huggingface dataset:
Blue carbon dynamics in mangroves and conservation of their services in the Coral Triangle Ecoregion, Southeast Sulawesi, Indonesia
Authors: Analuddin Kangkuso , Kadidae La Ode , Muhammad Yasir La Ode , Septiana Andi , Syahrir La , Rahim Saban , Pratama David , Fajar LD Abdul , Nadaoka Kazuo 
Published: May 2021

Abstract
Coral triangle eco-region is hotspot of coastal blue carbon, and contributes to the global carbon cycling. This study aimed to elucidate the blue carbon dynamics in mangroves and their importance services as source of blue carbon in the coastal zone of coral triangle ecoregion. The blue carbon content in mangrove sediment was analyzed, while blue carbon production and its export frommangroves leaf litterfallwasestimated. The results showed that the blue carbon content in mangrove sediment was significantly higher in deep of 40-50 cm than other layers(P< 0.05). The annual blue carbon production (g C/m2/year) was 495.80 for R. mucronata, 572.52 for C. tagal and 335.56 for R. apiculata. Moreover, the annual blue carbon exported g C/m2/year was 148.74 for R. mucronata, 171.76 for C. tagal and 100.68 R. apiculata. Overallcarbon production and carbon export from these mangrove species were 1403.88 and 421.18g C/m2/year, respectively.Therefore, huge blue carbon production and export by mangroves in this region contribute to the global carbon cycling in the coastal and marine environments. Thus, conservation of mangroves and their services is very important for maintenance the coastal productivity in the coral triangle eco-region.
Characteristics and Anti-Diabetics Activity of Jelly Drink Okra Mucus (Abelmoschus Escullentus L.)
Authors: Jariyah  , Arofah E M N , Sarofa U 
Published: May 2021

Abstract
Okra mucus is mucilage that contains food fibre, tannin, alkaloids, steroids, and flavonoids, so it has the potential as an anti-diabetic agent, which can be processed into an anti-diabetic functional beverage product in the form of a jelly drink. However, it still needs the addition of a gelling agent to form a jelly, for example carrageenan, while sucralose and stevia were used to add sweetness. The purpose of this study was to determine the characteristics and activities of anti-diabetic jelly drink okra mucus with the formula of adding carrageenan and low calorie sugar. The study used a completely randomized design of two factors: carrageenan (0.10; 0.20 and 0.30%) and sugar (sucralose; stevia) with a concentration of 0.02; 0.03 and 0.04%. Each formulation was repeated 2 times, the difference in the formulation was used Duncan’s further test (DMRT 5%). The results showed that formula with the addition of carrageenan 0.3% and stevia sugar 0.04% which produced okra mucus jelly drink with viscosity characteristics 279.50 cps, total soluble solids 15.00% Brix, gel strength 4.53 N, total phenol 76.63 mgTAE / g), anti-diabetic test (IC50) 32.60 mg / ml, and food fibre 1.29 g / 100g. Organoleptic test results showed an average taste score of 2.8 (not favoured - favoured), texture 3.7 (favoured - favoured), aroma 2.75 (not favoured), and colour 2.95 (not favoured - favoured).
Suitability Analysis of Pond Ecosystems on the East Coast of Sidoarjo for Seaweed Cultivation on Productivity, Quality and Carrageenan Content of Gracilaria sp
Authors: Purnomo T , Rachmadiarti F , Rohmatin D , Rahayu J 
Published: May 2021

AbstractGracilariasp. is seaweed that produces agar and carrageenan, which is needed by the food, pharmaceutical, textile, and cosmetics industries. The high demand encourages cultivation. This study aims to determine the suitability of the pond ecosystem on the east coast of Sidoarjo for the cultivation ofGracilariasp. The research was conducted in a pond in Kupang Village, Jabon District, Sidoarjo usingin-situobservational methods. Water samples were taken from the Aloo river and ponds, samples fromGracilariasp. taken purposively at 3 stations, namely station 1 Dusun Tegalsari, station 2 Dusun Kali Aloo, and station 3 Dusun Tanjungsari. The parameters measured include land suitability (temperature, pH, salinity, water Cd concentration), andGracilariasp. Productivity (carrageenan content). Analysis of Cd concentrations using the Atomic Absorption Spectrophotometer method. Analysis of carrageenan content using the Kjeldahl method. Data of Cadmium concentration analyzed descriptively qualitatively and compared with SNI 7387: 2009 and Kepmen LH No. 51/2004. The results showed that the pond ecosystem on the east coast of Sidoarjo was suitable for the cultivation ofGracilariasp.,Gracilariasp. yields met the quality standards where the Cadmium concentration was below the quality standard threshold, the carrageenan content was moderate.
Antibacterial Activities Test of Ethanol Extracts of Kundur Fruit (Benincasa hispida Thunb. Cogn) on Salmonella typhi Bacteria
Authors: Darmayani Satya , Alaydrus Syafika , Yunus Reni , Yuniarty Tuty , Dewi Niluh Puspita , Rosanty Anita , Supiati  
Published: May 2021

Abstract
One of the natural ingredients that can be used as medicinal plants is kundur fruit (Benincasa hispida Thunb. Cogn). Kundur is one of the plants that contain compounds that are efficacious in medicine. The people of the Moronene tribe in Southeast Sulawesi used to consume kundur fruit in a shredded way to treat typhoid caused by bacterium Salmonella typhi (S. Typhi). The general objective of this study was to determine the bioactivity of the ethanol extract of kundur fruit (B. hispida) as an antibacterial S. typhi. Determination of antibacterial activity was carried out using the broth microdilution method. The results showed that the ethanol extract of kundur fruit had inhibitory activity on the growth of S. typhi bacteria with a minimum inhibitory concentration (MIC) of 800 μg / mL. This activity was compared with chloramphenicol with a MIC value of 8 μg / mL. In conclusion, the ethanol extract of kundur fruit has the potential as a source of antibacterial compounds against S. typhi.
Synthesis of chitosan-CuO composite and it’s application as heavy metal adsorbent
Authors: Firnanelty  , Chadijah S , Ratna  , Nurhuda S , Sittiama  
Published: May 2021

Abstract
Shrimp shells is one of the alternative sources for the potential production of chitosan. Chitosan from shrimp shells extracted with acid has high extraction results. The chitosan obtained forms composite with CuO material (mixing materials). The study investigated the synthesis, characterization, and application of chitosan from shrimp shells and the ability of chitosan-CuO composites as heavy metal adsorbent. The physical characterisation its similarity with the commercial chitosan. The composite was made by mixing chitosan and CuO. The bond formation between chitosan-CuO showed by analysis of FTIR. Absorption of chitosan-CuO to mercury (Hg) was 87%. Chitosan-CuO is very potential as absorbent of heavy metal.
Antioxidant Activity of Chlorella vulgaris Used As an Antioxidant Cream
Authors: Putri T W , Nursida N F , Raya I 
Published: May 2021

Abstract
This study aims to analyze the antioxidant activity of Chlorella vulgaris for used as an antioxidant cream. The method used in this study is the DPPH method to measure the antioxidant activity of chorella vulgaris cream based on the IC50 value and the BSLT method for determining toxicity for cosmetic use. The result was that Chlorella Vulgaris cream had an IC50 value of 127 μg / mL with an antioxidant activity of 61.90%. As a control cream without the addition of Chlorella Vulgaris showed an IC-50 value of 79,423 μg /mL with antioxidant activity of 3.46%. Chlorella Vulgaris cream has a very high antioxidant activity compared to the control cream without the addition of Chlorella Vulgaris. Chlorella Vulgaris cream can be used as an anti-aging cream based on the LC50 value is non-toxic and has a pH of 5.5 and after storage the pH is 6.5 according to the pH of the skin, so it is safe to apply.
Utilization of Compost as ameliorant in a Nickel post mining soil
Authors: Zaeni A , Alwahab  , Hasmawati  , Hade S , Irnawati  , Susilowati P E 
Published: May 2021

Abstract
Southeast Sulawesi is one of the nickel producing regions. Nickel mining activities in addition to positive impacts can also have negative impacts such as decrease of soil and increased of accumulation of heavy metals in the soil. Therefore, couple solutions are needed to improve the quality of nickel mining soil, one of those is by providing soil amendments. The material that used in this research is compost. Compost fertilizer contains humic acid which has cation exchange ability so that it can be useful for remediating the nickel post-mining area. The research used a complete randomized design method by variating the ratio of compost to nickel post-mining soil. The method steps consisting of (1) Analysis of post-mining soil sample (2) Analysis of compost-mixed mining soil sample. The results showed that the best treatment was the 17% addition of compost to nickel post-mining sample which characterized by changes in soil characteristics, such as pH value 6.68 to 7.17 (neutral) ; C-organic content 2.01% to 3.69% (high); N-total 0.19% to 0.21% (moderate); P2O5 21.77 mg /100g to 25.03 mg/100g (moderate); K2O 15.13 to 17.77 (low); and nickel content of 1194.66 ppm to 988.86 ppm. Despite a decrease of nickel content in the soil, its level is still hazardous in term of human health.
Total Content of Phenol and Antioxidant Activity from crude extract Methanol of brown algae (Padina sp) collected from Kayoa Island, North Maluku
Authors: Khadijah  , Soekamto N H , Firdaus  , Syah Y M 
Published: May 2021

Abstract
Determination of total phenol content and antioxidant activity of brown algae (Padina sp) from Kayoa Island and determining the relationship between total phenol content and its antioxidant activity have been carried out. Crude extract of methanol was obtained by maceration of dried algae Padina sp. Determination of the extract secondary metabolites was carried out by phytochemical screening which showed the presence of alkaloid, phenolic, steroid, and flavonoid content. The total phenol extract was determined by the Folin-Ciocalteu method and the total phenol content was 4,43 mgGAE/g. Antioxidant activity was analyzed using the DPPH method and the IC50 value was 564,99 µg/mL. The total phenol content of the extract and its IC50 value shows a linear relationship y = 1218x - 4830.7 with a determination value R2 = 0.9981
The technique for separation and purification of gondorukem (gum rosin) from pine gum (pinus merkusii) with a simple distillation method
Authors: Natsir M , Nurdin M , Ansharullah A , Muzakkar M Z , Trimutia E , Irwan I , Salim L O A , Salmah S , Maulidiyah M 
Published: May 2021

AbstractThis study reports the processing and separation of gum rosin from pine gum (Pinusmerkusii). The research method was carried out with several stages, namely the process of tapping pine gum, the process of separation and purification. After the refining process, the gum rosin and turpentine oil are separated using a simple distillation technique. The results of gum rosin separation obtained from the distillation process were 86.67 with a soft point of 78.8°C, a vaporizing component of 0.976%, an acid number of 175.3125 and a saponification number of 178.81875. In addition to knowing the components of the gum rosin samples obtained, the identification of compounds was carried out using Fourier Transform Infrared Spectrophotometer (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS). The results of FTIR identification showed the presence of sp2C-H,-OH, sp3C-H, C=O,-CH2and - CH3groups, while GC-MS identification showed the presence components of Caryophyllene, Pimaric acid, Dehydroabietic acid, Abieticacid, and á-Pinene. The identification results indicate that the residue from the simple distillation is gum rosin.
Effect of hexamethylenetetramine surfactant in morphology and optical properties of TiO2 nanoparticle for dye-sensitized solar cells
Authors: Irwan I , Muzakkar M Z , Umar A A , Maulidiyah M , Salim L O A , Nurdin M 
Published: May 2021

Abstract
The past few decades Dye-Sensitized Solar Cells (DSSC) based on TiO2 nanoparticle have attracted much attention from researchers because of their promising Physico-chemical properties and high photoconversion efficiency. In this research, TiO2 nanoparticles mediated with hexamethylenetetramine surfactant were successfully synthesized by the hydrolysis method. The influence of hexamethylenetetramine surfactant precursor concentration on DSSC photovoltaic performance was investigated. The prepared samples are characterized by field emission scanning electron microscopy, X-ray diffraction, and UV–vis absorption spectroscopy. SEM analysis results show that the HMT surfactant has a big influence on the morphology, particle size, and crystal phase of TiO2 particles. The surface morphology exhibited the nanorice grain particles in all samples. By spectrophotometry, it was shown that the films had a bandgap of about 2.9 eV. The film promoted by HMT 0.3 M from DSSC showed a power conversion efficiency of 1.7%.
Isolation Mg(OH)2 from Dolomite with Extraction Process used HNO3
Authors: Sari N K , Ernawati D , Wurjani W 
Published: May 2021

Abstract
Dolomite MgCa(CO3)2 has not been used to the fullest in Indonesia, where the natural resources of dolomites are quite abundant and are available in very large quantities. Mg(OH)2 isolated of dolomite originated from the East Java region with the extraction process using nitric acid. Using variable time and temperature, to acquire the element Mg(OH)2. To get the greatest Mg(OH)2, the precipitation process from using NaOH, and isolating Mg(OH)2 from the Elements of Ca(OH)2 and other impurities with Na EDTA solutions. From research obtained the best condition Mg(OH)2 from dolomite with NaOH additions with a variable stirring time for 5 hours and a temperature of 45 °C is at 175.60 mg/L.
Physio-chemical Characteristic of Red Dragon Fruit and Pineapple Jam
Authors: Nurani F P , Sulistyoningsih E K B 
Published: May 2021

AbstractRed dragon fruit is one of fruit that easy to find in Indonesia. The availability of red dragon fruit is quite abundant, especially in harvest season. Sometimes, it became a problem when the fruit didn’t sell out and causing some change of quality. One way to extend the shelf life of red dragon fruit is by making jam. Jam is a gel-shape and semi solid food. The making of red dragon fruit jam was combined with the addition of pineapple that contain pectin which help the formation of gels. Sugar was added as sweetener and also as preservatives. On the other side, sugar have a role in gel formation with pectin. Commercial pectin was added to support gel formation in making jam. The factors observed in this study were concentrations of sugar (50,60,70%) and commercial pectin (0, 0.3, 0.5%) that might influence some quality parameters of jam such as spread ability, total soluble solid (TSS), pH, vitamin C and antioxidants value. The best characteristic of jam with spread ability 13.5, 70.5% of TSS value, pH was 4.39, vitamin C value was 0.81% and antioxidants value 19145.91 ppm was obtained with the addition of 50% sugar without the addition of pectin.
Extraction of Acemannan Polysaccharides Active Substance from Aloe Vera Flesh with Ethanol Solvent
Authors: Redjeki Sri , Yaqin Ainul , Iriani  
Published: May 2021

Abstract
This study was conducted to extract Acemannan Polysaccharides from aloe vera flesh using ethanol solvents and obtain the optimum extraction temperature and deposition time of the extraction process. The process was carried out in batches and in a laboratory scale, with the principle of liquid solid extraction in a stirred glass beaker. The extraction temperatures were 25°, 30°, 35°, 40°, and 45° C and the deposition times were 10, 12, 14, 16, and 18 hours. Some other variables were: 50 cc aloe vera juice volume, 200 cc solvent volume with 96% ethanol concentration, 45 minutes stirring time, and 500 rpm stirring speed. The results obtained were: the largest sediment mass, which was 2.1967 gram, was obtained at extraction temperature of 45° C and deposition time of 18 hours. Based on the results of qualitative analysis, the highest acemannnan content was obtained at 14 hours of deposition with a stirring temperature of 40° C and with 515.18 mg/gram glucose content.
The Diagnosis of Misconception on The Concept of Acid-Base Theory in Prospective Teacher Students Used a Three-Tier Test
Authors: Rusmini  , Suyono  , Jatmiko Budi , Yonata Bertha 
Published: May 2021

Abstract
Several phenomena of misconception have been discovered worldwide. In misconception, students strongly believe in the truth of the answers chosen of the questions given but the answers are wrong. This study aims to identify misconceptions that occur in first year students on the concept of acid-base theory. These students are pre service student in chemistry education. As prospective teachers, these students should be free from misconceptions so that they will not bring misconception to their own students one day. This study used a three tier diagnostic test to diagnose misconception from 125 students (1st and 2nd year) as data resources. The students have been given paper and pencil test consist of 15 questions. Each question consists of three levels, namely the choice of concept answers at the first level. The second level is the reason for the answer to the first level question. The third part is the level of confidence in the answers and reasons. Data analyzed to determine the percentage of misconceptions. The results showed that the first year students experienced misconceptions type 1, 2 and 3 in the low category. There were no students who guessed the answers.
The Effect of the Mahkota Dewa (Phaleria macrocarpa) on the Density of Collagen Incision Wounds
Authors: Sulistyoning Suharto Idola Perdana , Etika Arif Nurma , Nurseskasatmata Satria Eureka , Yunalia Endang Mei 
Published: May 2021

Abstract
Wounds are a disorder in the continuity of the skin or mucosal epithelial layer, which is a result of physical or thermal damage The research purpose was to analyze effect of mahkota dewa (Phaleria macrocarpa) on the density of collagen incision wound of white rats (Rattus norvegicus). This research has used post test only control group design. The sample were 30 male rats that grouped into control (K1, K2, K3) and treatment (P1, P2, P3) groups. The control group was given 1%CMC, while the treatment group was given oral extract of mahkota dewa at a dose of 22.5 mg/kg bw. The data was analyzed by Kruskall Wallis test. The results showed that there were a significant difference of collagen density between control and treatment group. The mahkota dewa fruits extract increased the macrophage activity. Thus, the macrophage activity could increase the Transforming Growth Factor – ß (TGF-ß) secretion. The TGF-ß could stimulate fibroblast prolipheration. In addition, collagen synthesis could increased. Based on the results, Mahkota dewa (Phaleria macrocarpa) extract could increase the collagen density of incision wound of white rats (Rattus norvegicus).
ANALYSIS OF SERVICE LEVELS OF THE TIDORE-SOFIFI SPEEDBOAT MODE DURING THE COVID-19 VIRUS PANDEMIC
Authors: Gaus Abdul , Sultan Mufti Amir , Ayub Wahab Iis Hamsir , Abdullah Abd. Majid , Nu’man  
Published: May 2021

Abstract
Speed boat is one of transportation mode to service the Tidore-Sofifi route picking the customers up from Islands Tidore to Halmahera island vice versa clear. Many customers doing a traveling use this mode demands attention to the comfort and safety aspects of the mode user, especially at the Covid-19 pandemic moment. Condition on the ground indicates speedboat mode operating throughout the day, in any the weather picks up people and objects. The purpose of this research analyzes speed boat service level according to rating mode user transportation at the Covid-19 pandemic moment by using analyze method Importance Performance Analysis (IPA). To reach the purpose of this research is done some steps specifically: counting a decrease in the average number of customers per day, map the relationship between the importance and performance of each service indicator according to customer assessment. From the result of the research obtained that during the pandemic Covid-19 number of customers in daily average is carried decreased dramatically to 10,10% numbers of the total customer usually carried up in normal time. The level service from the speedboat transportation Tidore-Sofifi by the IPA method obtained variable has high the interests/expectations however the reality/performance is not good enough, is the availability variable of the first aid kit and availability Hand sanitizer /ACT. While the variable is considered less important by customers, but its performance is good, that is lighting in the night, availability life jacket, and availability rope thrower.
Geografis Information System of Determining the High School (SMA) Zonation in Merauke City in Receiving New Students (PPDB) Using the Buffering Method
Authors: Xaverius F , Lintang M , Putra Nasra Pratama 
Published: May 2021

Abstract
Education is one of the bases in creating an atmosphere, learning processes in increasing the knowledge of skills and character development of each person. The Education and Culture Office of the Merauke Regency based on the Permendikbud Republic of Indonesia No. 51 of 2018 and Permendikbud No. 20 of 2019 concerning zoning determination, if students want to register to be accepted at the school, they must pay attention to the distance between their place of residence and the distance of the closest school, so that there is an even distribution of the number of students, as well as the composition of knowledge from students nothing is too dominating as a whole but evenly. This research is carried out by utilizing the Geographic Information System (GIS) in determining to zone for students who will register to Senior High School (SHS) in the Merauke city area, to obtain information about the nearest school, based on Government regulations. the parameter used is distance radius. the method applied in this research is the buffering analysis model. This analysis model can identify locations to obtain coverage that can be used in identifying objects based on the radius, thus producing polygons around objects. The results of this study are in the form of GIS to SHS and can map and determine SHS zonation in Merauke City, as well as displaying the distribution of SHS in Merauke city.
Bullwhip Effect Reduction Using Vendor Managed Inventory (VMI) Method in Supply Chain of Manufacturing Company
Authors: Ernawati D , Pudji E , Rahmawati N , Alfin M 
Published: May 2021

Abstract
Prediction of the amount of production can be done by forecasting demand and using appropriate methods. The supply chain studied at ABC company consists of manufacturing (vendors) and sales offices. Initially forecasting is done at each level of the supply chain with different forecasting methods. Therefore, uniform forecasting methods are needed for each supply chain actor. Based on testing the forecasting method conducted, the Winter’s Method. The model is used to link forecasting and implementation using the Vendor Managed Inventory (VMI) approach. Inventory planning in the supply chain cannot be done individually and must be thought of as a coordinated system. Inventory control is done by using the optimal lot calculation, namely Economic Order Quantity (EOQ). Based on demand forecasting and optimal lot determination, it can be calculated the value of the Bullwhip effect that occurs after the use of VMI in the supply chain has changed from 1.359 to 0.514 at the Manufacturing level.