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All Journal Bestari: Jurnal Studi Pendidikan Islam Makara Journal of Science
Kurnia, Asep
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Religion Education

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Konsep Berpikir dan Dzikir sebagai Proses Pendidikan Islam Kurnia, Asep; Ahmad EQ, Nurwadjah; Suhartini, Andewi
Bestari | Jurnal Studi Pendidikan Islam Vol 18 No 1 (2021): Studi Pendidikan Islam
Publisher : Fakultas Tarbiyah, Institut Agama Islam Darussalam (IAID), Ciamis, Jawa Barat, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36667/bestari.v18i1.664

Abstract

This research aims to examine the concept of thinking and dhikr as the process of Islamic education by using the method of literature or library research, namely research conducted through data collection or scientific papers with research objects or data collection is literature. The results of the analysis showed that, the concept of Thinking and dhikr are two activities that should not be separated. By intermediaries thinking about the universe, then comes memory as the conclusion of thinking, namely that all this does not happen by itself, but there is a God almighty creator, that is Allah SWT. Because of the real thinking, remember the more real. Islamic education is expected to change the behavior of learners, increase the knowledge of learners by channeling or transferring the concept of science and able to improve good ethics. In short, Islamic education should be able to print the ideal Muslim person as caliph.
Determination of Polycyclic Aromatic Hydrocarbons (PAHs) Using Environmentally Friendly Liquid Chromatography Kurnia, Asep; Lim, Lee Wah; Takeuchi, Toyohide
Makara Journal of Science Vol. 22, No. 1
Publisher : UI Scholars Hub

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Abstract

An analytical methodto determine polycyclic aromatic hydrocarbons (PAHs) is required to obtain high-quality analytical results. The purpose of this study is to achievegood separation ofa few PAHs by using environmentally friendly liquid chromatography. Accordingly, a liquid chromatograph incorporating a fluorescence detector, UV detector, and a capillary column is employed herein to simultaneously minimize the use of chemicals and obtain analytical results better than those obtained using aconventional column. Observation parameter include single analysis ofeach PAH, method valida-tion, the new stationary phase, the effectof mobile phase concentration, and Quenchereffect. The PAHs tested include naphthalene, phenanthrene, anthracene, fluoranthene, and pyrene. The test results show that when using an acetonitrile concentration of 100%, the retention times of different PAHs do not differ significantly. Furthermore, upon decreasing the acetonitrile concentration, the retention time increases, and better separation was achieved. The value ranges of precision, LOD, LOQ, and linearity are 3.43 – 12.42%, 4.7–15.1 mg/L, 15.6 – 50.5 mg/L, and 0.87–0.99, respectively. The new Sil-S-ImC30 stationary phase showed good results in terms of separation of PAHs. Likewise, the use of 60, 70, 80, and 90% acetonitrile as the mobile phase in combination with 0.03 M acrylamide as the quencher affected retention time but not separation.
Determination of Carbofuran on Hydrophilic Interaction Liquid Chromatography using TSKgel®Amide-80 as a Stationary Phase Kurnia, Asep; Lim, Lee Wah; Takeuchi, Toyohide
Makara Journal of Science Vol. 20, No. 4
Publisher : UI Scholars Hub

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Abstract

Hydrophilic interaction liquid chromatography (HILIC) equipped with an environmentally friendly capillary column was employed to investigate the retention behavior of carbofuran; a polar stationary phase was used as well. Several conditions were conducted to investigate the retention behavior of carbofuran, such as a comparison study TSKgel®Amide-80 with another polar column, a comparison study retention behavior of carbofuran on various wavelengths, the water content effect on HILIC mode, the effect of buffer concentration on HILIC mode, and the analytical performance of carbofuran. The results showed that TSKgel®Amide-80 exhibited a better performance than other polar stationary phases in carbofuran determination, and observations at wavelengths of 251 and 254 nm showed higher absorbance for carbofuran than others. In addition, the increase of water content and salt buffer concentration in the mobile phase led to a shorter retention time. The recovery of this method was 101 ± 10.1%, while the limit of detection and the limit of quantification were 0.66 ppm and 2.22 ppm, respectively. Consequently, TSKgel®Amide-80 offers a good perform
Degradation of Cypermethrin by Indigenous Bacteria from Contaminated Soil Indratin, Indratin; Kurnia, Asep; Wahyuni, Sri
Makara Journal of Science Vol. 23, No. 4
Publisher : UI Scholars Hub

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Abstract

Soil contamination by pesticides should be controlled by using soil microbes with the ability to degrade pesticide resi-dues. Microorganisms that have adapted to a particular pesticide could accelerate the degradation process. The present study aimed to select bacteria in soil that could potentially degrade cypermethrin residues. Experiments were carried out in a laboratory and employed soil samples collected from the districts of Demak, Magelang, and Brebes. Each soil sample was initially tested for the presence of bacteria and pesticide residues. Indigenous microbes capable of living in contaminated environments were adapted to cypermethryn and cultured in the laboratory. Experiment was carried out in several stages, namely, (1) isolation and identification of microbes that could degrade cypermethrin, (2) testing of the growth characteristics of isolates in cypermethrin, and (3) determination of cypermethrin residues in cultures. Three isolates, namely Pseudomonas alcaligenes, Bacillus amyloliquenfaciens, and Pseudomonas aeruginosa, were found to decrease cypermethrin residues by up to 95% with fast half-lives and good growth capability. The results demonstrate the potential applications of the isolates in biodegradation processes and remediation of cultivation fields.
Degradation of Chlorpyrifos Residue on Tropical Inceptisol Soil with Indigenous Bacteria Treatment Kurnia, Asep; Zu`amah, Hidayatuz; Sulastri, Baiq Nunung; Makmur, Ria Fauriah
Makara Journal of Science Vol. 28, No. 2
Publisher : UI Scholars Hub

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Abstract

The use of soil microbes is one of the most effective methods for degrading pesticide residue in soil. Microbes can accelerate the degradation of persistent pollutants including chlorpyrifos in soil. This research aims to find soil bacteria with the greatest potential to degrade chlorpyrifos residue in tropical inceptisol soil and determine its degradation index (DI). The soil used in this experiment was collected from agricultural fields in the districts of Demak, Central Java Province, Indonesia. The experiment was performed using factorial randomize complete block design composed of two factors and four replications. The first factors were made up of two treatments, namely, sterile soil (S) and nonsterile soil (NS). The second factors were composed of five treatments, namely, 1) Delftia acidovorans, 2) Entrobacter sp., 3) Chryseobacterium geocarposphaerae, 4) a mix of three bacteria, and 5) without bacteria (check). Results revealed that D. acidovorans grew faster than other bacteria in chlorpyrifos-contaminated soil. The optimum condition of bacteria growth and chlorpyrifos degradation was observed at the temperature of 28.9 ℃ and soil pH of 5.75. D. acidovorans promoted the degradation of chlorpyrifos residue in soil faster than others with a DI of 0.096. The half-life of chlorpyrifos in soil was faster in NS than in S.
Co-Authors Ahmad EQ, Nurwadjah Andewi Suhartini, Andewi Indratin Indratin Lee Wah Lim Makmur, Ria Fauriah Paradifan, Paradifan Sri Wahyuni Sulastri, Baiq Nunung Toyohide Takeuchi Zu`amah, Hidayatuz