bluuebunny/crossref_metadata_2025_split huggingface dataset:
Comparative morphological analysis of ovaries in Hibiscus rosa-sinensis L. single pink, crested peach and double orange flowers
Authors: Rostina I , Kusumawati S A , Salamah A 
Published: January 2021

Abstract

Hibiscus rosa-sinensis L. generally has a 5-loculed ovary, with each locule consist of numerous ovules. Observations have been made on the ovarian morphology of H. rosa-sinensis L. single pink, crested peach, and double orange flowers. The specimens of ovaries were prepared by a free-hand section technique and observed under the Dino-Lite digital microscope. The results show that a single pink flower has a normal ovary that consists of 5 locules. There are two ovule rows in each locule, with each row consists of 6 ovules. The observation of the ovaries of the crested peach flowers shows that one locule with another is indistinguishable, but the ovules are still present. Even though ovule still exists in ovarium, the number and the arrangement of the ovules are difficult to determine. In the longitudinal and cross-sections of the double-orange variation, ovules are not found in the ovary. Instead, petal-like structures seem to replace the ovule position. Based on the results of morphological observations, homeosis events are suspected to occur in the ovaries of crested peach and double orange flowers. Presumably, there is a difference in class C genes AGAMOUS expression of the three types. The obtained morphological data is the basis for further research on the molecular analysis of the three variations of the flower.
The utilization of water hyacinth (Eichhornia crassipes) for the development of sludge worm (Tubifex sp.) cultivation
Authors: Ikhsan C , Safitri S D , Khaerunnisa S , Purwanti D , Lestari R 
Published: January 2021

Abstract
Sludge worms (Tubifex sp.) is one of the important components of fish cultures. Sludge worms contain high protein as nutrition for fish foods. The worm grows fast and relatively smaller size that is suitable with the small size of the fish mouth. Intensification of sludge worm production through cultivation needs to be done in order to meet the growing needs of fish food. Water hyacinth (Eichhornia crassipes) is a weed that lends the ecosystem and is not utilized in the community. In fact, water hyacinth has a high protein content to become feed nutrition. This research supports the conversion of water hyacinth into optimal cultivation media. is the experimental design used four media variations namely treatment-I, treatment-II and treatment-III. Fermentation was used to breakdown the fibre of water hyacinth. The water system used a recirculation system. The parameters tested are water quality, water flow rate & dissolved oxygen. The pH showed range from 7.0–7.6. DO showed range from 1.2−1.4 mg/L. The temperature showed range 25.6–28.2 °C.
Isolation, screening, and molecular identification of lignin-degrading fungi isolates from Cibinong Science Centre, Indonesia Institute of Sciences, Cibinong, West Java
Authors: Putri P I P A , Mangunwardoyo W , Sudiana I M , Idris  , Ramadhani I 
Published: January 2021

Abstract
Lignin is a recalcitrant compound that has potential as fuels and chemicals on industries. Contamination of recalcitrant compound with the lignin-like structure on the ecosystem is being concerned worldwide. Fungi is the most targeted organisms with lignin-degrading ability, can secrets laccase and peroxidase to facilitate free radical chain reaction on lignin complex structure. Isolation, screening and identification for isolate with ligninolytic ability is the main purpose of this project. Phylum Ascomycota and Basidiomycota be the main target of this research. Isolation technics that being used are surface sterilization with distilled water and NaClO on PDA medium. Pure culture with ability to grow on lignin minimal medium with black liquor as the only carbon sources then are identified by molecular identification. Isolates that can grow on lignin minimal medium are identified as Fusarium verticillioides strain CBS 127178, Lasiodiplodia sp. LAS-2016 strain CBS 125262, Trichoderma harzianum strain 35814DRJ, and Lasiodiplodia theobromae strain CBS 127106. Four isolates obtained with lignin-degrading ability then preserved by cryopreservation technic for use in the next projects.
Distribution and area changes of mangroves with remote sensing technology in Perancak Estuary, Jembrana, Bali
Authors: Asmara T M , Saraswati R , Hernina R 
Published: January 2021

Abstract
Mangrove vegetation has an important role for its functions and benefits to the coastal area and the society which lives in it. The purpose of this research is to know the distribution and the changes of mangrove vegetation area located in Perancak Estuary area within 10 years, and to know the green-ness level and the environmental parameters of mangrove vegetation; salinity and substrate condition. To observe the distribution and the changes of mangrove vegetation area, supervised classification is used on SPOT satellite imagery in 2007 and 2017. The result shows that the expansion of mangrove vegetation area in Perancak Estuary is 18.7 hectares along with the increasing of the green-ness level. In addition, the environmental parameters which are the salinity and the substrate conditions are also observed, where the average salinity value is 31.54 ppt and the substrate conditions are good (not much waste).
The relationship of volcanic facies and temperature range derived from the associated clay mineral in Gunung Endut, Banten
Authors: Primayudha F , Sahdarani D N , Kadja G T M , Supriyanto  
Published: January 2021

Abstract
Gunung Endut located in Lebak, Banten is one of the prospected areas of geothermal energy resource on the island of Java, Indonesia. The presence of clay mineral in the surface can help to determine the hydrothermal fluid temperature circulating in Gunung Endut. Based on the collected samples, petrography analysis revealed the presence of clay minerals while diffraction method confirmed the presence of dickite, montmorillonite, kaolinite, pyrophyllite, chlorite, diaspore and illite. There are three different temperature range from each volcanic facies. It is predicted that clay minerals at their temperature range in Gunung Endut are formed based on the type of rocks and the topography of the research area.
Spatial pattern of supporting facilities in mangrove ecotourism Karawang regency, West Java
Authors: Angelika P , Handayani T , Susilowati M H D 
Published: January 2021

Abstract
Karawang regency has the second area of mangrove forest in West Java Province with an area of 10.005.93 Ha, which encourages the formation of mangrove ecotourism in Karawang regency. Tangkolak mangrove ecotourism, Cilamaya Wetan district and Pasir Putih mangrove ecotourism, Cilamaya Kulon district is ecotourism that developed in 2018. However, the place has had thousands of visitors, even though it’s classified as a new ecotourism and the facilities that provided are still quite simple. This research purpose is to find out the spatial pattern of supporting facilities based on the interval distance. This study uses a descriptive spatial analysis method. The result is the distance interval affects the formation of facilities patterns around ecotourism. The spatial pattern of these supporting facilities also affects the amount of income and the development purpose, where the facilities that located in close range will have a greater income than intermediate and long-distance intervals as well as the purpose of approaching tourist attractions.
Mineralogy of travertine deposit in Ciseeng geothermal field, Parung, West Java, Indonesia
Authors: Kurniadi D T , Sahdarani D N , Ponka M A , Yoga D A , Sihombing F M H , Supriyanto  
Published: January 2021

Abstract
Travertine deposits are carbonate rocks consists mainly of calcium carbonate minerals, supersaturated from bicarbonate-rich water. Both recent and fossil travertine deposits are found in Ciseeng geothermal field, West Java. The travertine deposits are distributed around three distinctive areas Tirta Sayaga, Mount Panjang and Mount Peyek. This study aims to determine minerals found in travertine deposits in Ciseeng geothermal field. Mineralogical analysis can determine the evolution of hydrology system and local climate change. Principal methods of analysis consists of petrographic and diffraction methods. Analysis results indicate similar mineral composition of calcite and microcrystalline carbonate (micrite) between recent and fossil travertine deposit with more diverse texture in fossil travertine due to the evolution of water composition affecting deposition and diagenesis process. The absence of aragonite indicates a low-temperature geothermal system.
Rock physics modelling in unconsolidated sandstone reservoir based on contact theory method case study: FRR Field, Kutai Basin
Authors: Riyanto A , Maulana M R , Syari F T , Widyarta R M 
Published: January 2021

Abstract
The study of rock physics modeling has been successfully carried out in FRR Field, Kutai Basin. This study aims to predict elastic parameters of rock such as V
p, V
s, and density which represent the characteristic of reservoir. The Contact Theory (CT) method was used for conducting rock physics modeling at the unconsolidated reservoir. CT method combines the elastic modulus of Hertz Mindlin at the critical porosity (Φ0) and Hashin Shtrikman Walpole lower bound (HSW−) to interpolate the elastic modulus from the critical porosity to the minerals modulus. Gassman model has been applied to estimate bulk modulus of a fluid-saturated rock with variation water and gas saturation. The data used in this study is log data coming from one well in FRR Field, Kutai Basin. The targeted reservoir was identified as gas sand reservoir that was deposited in the channel complex of turbidity system. Based on the data, the reservoir has the majority of sandstone rock marked by low density and low gamma-ray at the upper part of log data. The results show correlation between elastic properties estimation and log data with the correlation of V
p was 0.66; V
s was 0.5310, and density was 0.99. This result was indicated that the CT method successfully predicts elastic parameter in unconsolidated sandstone reservoir of the FRR Field, Kutai Basin.
The Benktander claim reserving method, combining chain ladder method and Bornhuetter-Ferguson method using optimal credibility
Authors: Triana S , Novita M , Sari S F 
Published: January 2021

Abstract
Based on the settlement period for insurance claim, insurance is divided into 2 types of business which are short-tail business (settlement period <1 year) and long-tail business (settlement period ≥1 year). In long-tail business, it is important for insurance company to have claim reserve in order to settle claims in the future. Claim reserve modelling is done using chain ladder method that is based on the trend of paid claims. Another method that is often used is Bornhuetter-Ferguson which is based on paid claims and also premium. In this paper, Benktander method that combines chain ladder and Bornhuetter-Ferguson using optimal credibility is introduced. Optimal credibility is obtained through minimum mean squared error and minimum variance. Benktander provides moderate reserve compared to chain ladder and Bornhuetter-Ferguson.
Study on European put option pricing with underlying asset zero-coupon bond and interest rate following the Vasicek model with jump
Authors: Lukman P C , Handari B D , Tasman H 
Published: January 2021

Abstract
This paper examines the price of European put options with underlying asset zero-coupon bond and the interest rate that satisfied the Vasicek model with jump. The study was conducted by reconstructing the European put option pricing equation. The jump size is defined following a mixed-exponential distribution. By utilizing infinitesimal generator and martingale concepts, Laplace transform is constructed for the distribution of the Vasicek model with jump. Then, using the results of the Laplace transform for the distribution of the Vasicek model with jump and the concept of equivalent martingale measure, the European put option pricing equation with underlying asset zero-coupon bond is constructed.
Performance evaluation of the Bühlmann credibility approach in predicting mortality rates
Authors: Harjani D A , Nurrohmah S , Novita M 
Published: January 2021

Abstract
Modeling mortality is an important thing for insurance company in determining the appropriate premium for a policy holder. This paper explains the Bühlmann credibility approach for modeling mortality. Bühlmann’s credibility model is generally used to predict the value of a random variable in the next future period. In predicting the value of a random variable in the next two or more future periods, an approach is needed. In this paper, the Bühlmann credibility approach is done through 2 strategies: the expanding window strategy and the moving window strategy. The expanding window strategy is done by adding the predicted value to the data to produce a predicted value in the following year while the moving window strategy is done by adding the predicted value to the data and discarding the oldest data to produce a predicted value in the following year. Mortality prediction performances from the Bühlmann credibility approach are being analysed by comparing the values of AAMAPE and the reduction ratio of the Bühlmann credibility approach to the Lee-Carter model. From this paper, it was found that the Bühlmann credibility approach produced better mortality predictions compared to the Lee-Carter model in case of Australian mortality data.
Recursive and moment-based approximation of aggregate loss distribution
Authors: Ghinawan F , Nurrohmah S , Fithriani I 
Published: January 2021

Abstract
Determining the distribution of aggregate loss is an important issue for insurers. Basically, the distribution of aggregate loss can be determined using n-fold convolution of the probability density function of severity distribution. However, problems in computation for this method causes findings of new methods to approximate aggregate loss distribution. One of the methods which is widely used and claimed to give a good approximation is Panjer recursion. Panjer introduced a recursion formula which can be used to compute aggregate loss probabilities. This method requirements are discrete severities distribution and (a, b, 0) class frequency distribution. The Panjer recursion method could not be applied if those two requirements are not met, so a discretization process is needed for continuous severity cases. This paper explored the use of Panjer recursion method for continuous severity cases. The method of rounding is used to discretize the continuous severity random variable with span h. It means that random variables which are the discretized version of severity random variables have probabilities in the span of h (h, 2h, 3h, and so on). The result improves when the discretization span is small enough. Beside Panjer recursion method, there is a new method, called moment-based, which can be used to approximate aggregate loss distribution using its moments. This method presents an approximation formula of aggregate loss distribution probability density function, which contain coefficients which can be determined by matching its moments with aggregate loss moments. Both of these methods tend to give relatively similar results when the span used in the recursive method is small enough and moments used in moment-based is adequate. The span of discretization for the recursive method is said to be small enough if no jump is seen in cumulative distribution function of severity random variables. t moments used in moment-based is said to be adequate if the result using t + 1 moments give no significant difference.
Claim reserving prediction with Bornhuetter-Ferguson method
Authors: Saputra I G C D , Nurrohmah S , Sari S F 
Published: January 2021

Abstract
In the long-tail business insurance class, claim settlement takes at least one year, since the claim was filed. This is because insurance companies must investigate in advance of the incident. The problem in the long-tail business can be attributed to the large or unresolved number of claims, called outstanding claims. The prediction of outstanding claims has an important role considering insurance companies are required to allocate sufficient reserves for future payment of claims. Generally, the problem of prediction of outstanding claims utilizes run-off triangle. Run-off triangle is an instrument, which is used to analyze the relationship between claims payments that have been made over the past few years. One of the prediction methods that commonly used is the Bornhuetter-Ferguson method. This method will be applied to the paid loss and ALAE Commercial Auto/Truck Liability/Medical insurance data, which is obtained from Highline Annual Statement Schedule P Data from all industry in the United States for the period 1999–2008, where the claim payment is stated in USD (000’s).
The development of biology instructional media based on macromedia flash from the invertebrate’s inventory output at “Pulau Tikus”
Authors: Anggraini N , Jumiarni D , Ekaputri R Z 
Published: January 2021

Abstract
The Purpose of this research is: 1) to know and inventories the types of invertebrates which live is in Tikus Island; 2) to develop the biology instructional media of animal course based on the macromedia flash for the 10th grade of high school students, 3) to study the quality of learning based media through the invertebrate’s macromedia, and its assessment on biology teachers. The object of this study utilizes the invertebrate inventory at Tikus island, in which practical survey, interview and explorative descriptive on another types of biota was conducted at Tikus island. The development of product learning was based on macromedia flash research (Research and Development), by implementing the ADDIE Model (Analysis, Design, Development and Production, Implementation, Evaluation). According to the obtained results, there were 18 Species taken from 6 phylum invertebrates. These are Porifera, Coelenterate, Mollusca, Vermes, Echinoderms and Arthropods. The survey showed that based on the validation of linguistic expert (86,4%), validation subject matter experts (83,9 %), validation of media expert (87,8%) the validator eligibility by teachers (84,5%) and the test of the students (86,04%) are all in very good criteria. As seen at the percentage range, it can be inferred that biology media based on macromedia flash of the invertebrate inventory at Tikus island is deemed as very appropriately used by the teachers and students.
The analysis of students’ interest and their learning outcomes through the implementation of Course Review Horay (CRH) method
Authors: Ekaputri R Z , Primairyani A , Karyadi B , Parlindungan D 
Published: January 2021

AbstractThis study aims at investigating whether the implementation of “course system horay” is able to boost the students’ outcome and their interest in the subject of general biology, the odd semester of the 2019/2020 academic year. The type of this study is categorized as classroom action research with 50 students as the subject research. The data collection was conducted using observation, questionnaires, paper-based tests, and documentation. Meanwhile, the technique of analysis was done using descriptive study. By implementing the course system horay, we report that there is a significant increase in the students’ outcome in the general biology course. The analysis also reveals that the mean scores of students’ interest are higher on average.
Analysis of higher order thinking skills instrument test for pre-service biology teachers based on marine ecology toward sustainable development
Authors: Jumrodah J , Liliasari S , Adisendjaja Y H , Sanjaya Y 
Published: January 2021

Abstract
This research used quantitative descriptive approach. It aims to analysis the quality of instruments test include validity, reliability, difficulty level and index of determinant to develop tests of critical thinking skills and creative thinking skills of prospective pre-service biology teachers on marine ecology theory. The test used instrument consisted of 2 type namely question descriptions and two tier multiple choice. There were two test of validation, namely content validation and empirical validation. The results of content validation concluded the question tests that feasible to be used with improvements. The results of empirical validation show that the ten items are valid question descriptions category and two invalid categorized questions. Where as instrument test twenty-three of two tier multiple choice valid in categories and four invalid categorical questions. Question descriptions instrument test used reliability analysis using Cronbach Alpha r11 = 0.73 (high). Instrument test two tier multiple choice used KR-20 r11 = 0.83 (very high), therefore the instruments test made are suitable for implementation in marine ecology. The average value of high order thinking skills for the question descriptions instrument test achieved by students was 26, while the two tier multiple choices instrument test 28. The highest value of the description questions instrument test achieved by students is 56 and the lowest score is 3. The highest value of two tier multiple choice questions instrument test achieved by students is 56 and the lowest score is 11. It shows that the ability of high order thinking skills of students is still lacking.
Ethnobotany study of medicinal plants in Bengkulu as a medium of student learning: The Euphorbiaceae family
Authors: Kasrina K , Zukmadini A Y 
Published: January 2021

Abstract
Ethnobotany study is a way to uncover the diversity of plants that are used in an ethnic or region. Although ethnobotany research has been done in Bengkulu, there are still a lot of data that has not been revealed and the results are still not well documented. From the results of the exploration of medicinal plants that have been done by Euphorbiaceae is one of the largest families reported utilization, and the types used are different between regions, so the utilization information has not been recorded as a whole. On the other hand, this family is one of the selected families to be studied by students. This study aims to inventory the medicinal plants of the Euphorbiaceae family that are utilized by Bengkulu society which can be used as media for student learning. Research methodology by conducting field surveys (by means of exploration, observation, interviews with informants chosen by purposive sampling) and literature studies. Data analysis was carried out descriptively. From the results of research on the family Euphorbiaceae found 18 types of medicinal plants including: candlenut (Aleurites moluccina), earrings (Acalypha australis) bone wood (Euphorbia tirucalli), Jatropha curcas and others. The use of these plants for the treatment of tonsils, headaches, wound medicine, malaria, jaundice, magh, itching, colds, warts, heart disease and so forth. Jatropha curcas is a commonly used plant and the benefits are varied. The data of 18 types of plants are then documented in a Bengkulu medicinal plant dictionary along with other plant species, so that they can be used as student learning media.