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All Journal J SIG (Jurnal Sains Informasi Geografi) Padjadjaran Journal of Dental Researchers and Students
Wicaksono, Krisna Wahyu
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Dentistry Earth & Planetary Sciences Energy Environmental Science Immunology & microbiology Medicine & Pharmacology Public Health

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ANALISIS SUHU PERMUKAAN LAUT SAWU TAHUN 2021 MENGGUNAKAN CITRA SENTINEL-3 Handoko, Eko Yuli; Syariz, Muhammad Aldila; Wicaksono, Krisna Wahyu
J SIG (Jurnal Sains Informasi Geografi) Vol 6, No 2 (2023): Edisi November
Publisher : Universitas Muhammadiyah Gorontalo

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31314/jsig.v6i2.2403

Abstract

The eastern part of Indonesian Seas has a very unique characteristic as it is traversed by the Indonesian Through Flow (ITF). The ITF is a movement of water masses from the Pacific Ocean to the Indian Ocean, driven by the pressure differences between these two oceans. The movement of water masses and currents, along with the existence of monsoon winds that blow across the region throughout the year, impact the Sea Surface Temperature (SST) in Indonesia. The SST can be derived from satellite imagery such as MODIS and SeaWIFs images. This study utilized Sentinel-3 Sea and Land Surface Temperature data, with better spatial and temporal resolution than the two aforementioned images, to process the Sea Surface Temperature values. The research also investigated sea surface temperature values correlation with the movement and speed of winds occurring in Indonesia. The research results presented the monthly time-series distribution of sea surface temperature values in the Savu Sea for the year 2021. The analysis revealed that the lowest sea surface temperature values occurred in July, while the highest were recorded in December. The sea surface temperature values per month demonstrated an increase during the westerly monsoon from October to April, which corresponds to the rainy season in Indonesia. Conversely, during the easterly monsoon, the sea surface temperature values tended to be lower, resulting in the dry season due to decreased ocean evaporation. Furthermore, the study found a negative correlation between sea surface temperature values and wind speed, with a strong correlation coefficient of -0.5709.
Uji aktivitas antibakteri minyak atsiri daun sirih hitam (Piper betle L. var. nigra) terhadap pertumbuhan Streptococcus mutans Wicaksono, Krisna Wahyu; Alhawaris, Alhawaris; Ismail, Sjarif
Padjadjaran Journal of Dental Researchers and Students Vol 10, No 1 (2026): February 2026
Publisher : Fakultas Kedokteran Gigi Universitas Padjadjaran

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24198/pjdrs.v10i1.69075

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ABSTRACT Introduction: The prevalence of dental caries in Indonesia remains relatively high. The main cause is Streptococcus mutans, which can proliferate and has the potential to demineralize the tooth surface. A preventive approach is the use of natural substances with antibacterial properties. One natural material with potential antibacterial activity is the essential oil of black betel leaf (DSH). This study aimed to analyze the antibacterial activity of black betel leaf essential oil against Streptococcus mutans. Methods: This study employed a true experimental design using the microdilution method. There were three groups: the test group, consisting of black betel leaf essential oil at concentrations of 4%, 2%, 1%, 0.5%, 0.25%, 0.125%, 0.0625%, 0.03125%, 0.015625%, 0.0078125%, 0.00390625%, and 0.001953125%; and the positive control group consisting of eugenol; and the negative control group consisting of 10% DMSO. Data were analyzed qualitatively by observing color changes. Results: The minimum inhibitory concentration (MIC) of black betel leaf essential oil was 0.5%. The minimum bactericidal concentration (MBC) was 4%. Columns 1A, 1B and 1C showed no color change, indicating that DSH exhibits antibacterial activity. Conclusions: Black betel leaf essential oil at a concentration of 4% exhibits the best antibacterial activity against Streptococcus mutans.KEYWORDS: antibacterial, essential oil, black betel leaf, Streptococcus mutansUji aktivitas antibakteri minyak atsiri daun sirih hitam (DSH) terhadap pertumbuhan Streptococcus mutans: Studi eksperimentalABSTRAK Pendahuluan: Persentase karies gigi di Indonesia masih tergolong tinggi. Penyebab utamanya berasal dari bakteri Streptococcus mutans yang dapat berkembang biak dan berpotensi dalam merusak permukaan gigi. Upaya yang dapat digunakan untuk mencegah hal tersebut, yaitu bahan alam yang berpotensi sebagai antibakteri. Salah satu bahan alam yang berpotensi sebagai agen antibakteri, yaitu minyak atsiri daun sirih hitam (DSH). Tujuan penelitian ini adalah untuk menganalisis aktivitas antibakteri minyak atsiri DSH terhadap bakteri Streptococcus mutans. Metode: Jenis metode penelitian kualitatif berupa true experimental menggunakan uji mikrodilusi. Terdapat 3 kelompok perlakuan meliputi kelompok uji minyak atsiri DSH dengan 10 konsentrasi, yaitu 4%; 2%; 1%; 0,5%; 0,25%; 0,125%; 0,0625%; 0,03125%; 0,015625%; 0,0078125%; 0,00390625% dan 0,001953125% serta kelompok kontrol positif meliputi eugenol serta kelompok kontrol negatif meliputi DMSO 10%. Analisis data dinilai secara kualitatif dengan mengamati perubahan warna. Hasil: Nilai MIC dari minyak atsiri DSH sebesar 0,5%. Nilai MBC dari minyak atsiri DSH sebesar 4%. Kolom 1A, 1B dan 1C menunjukkan tidak ada perubahan warna yang menandakan DSH bersifat antibakteri. Simpulan: Minyak atsiri DSH konsentrasi 4% memiliki aktivitas antibakteri terbaik terhadap bakteri Streptococcus mutans.KATA KUNCI: Antibakteri, minyak atsiri, daun sirih hitam, streptococcus mutans 
Co-Authors Alhawaris, Alhawaris Eko Yuli Handoko Syariz, Muhammad Aldila