Judul: Potensi Senyawa Turunan Katekin sebagai Antibakteri dalam Menghambat Glukosamin-6-fosfat Sintase secara In Silico
Abstrak: Camellia sinensis atau teh merupakan komoditas perkebunan yang sangat populer. Teh ini diolah menjadi produk olahan minuman, salah satunya adalah teh hijau yang biasa dikonsumsi oleh masyarakat Indonesia. Teh sudah banyak diteliti berkhasiat sebagai antioksidan, antidiabetik, antiinflamasi, antibakteri, antivirus, dan antikanker. Tujuan penelitian ini adalah menguji potensi senyawa flavonoid pada teh hijau, yaitu katekin, epikatekin, galokatekin, dan epigalokatekin sebagai antibakteri melalui penambatan molekul dengan reseptor enzim glukosamin-6- fosfat sintase (GlmS). Reseptor GlmS dihambat oleh senyawa turunan katekin agar glukosamin-6-fosfat yang merupakan senyawa antara sintesis peptidoglikan tidak terbentuk. Penambatan molekul menunjukkan bahwa semua senyawa, kecuali katekin, memiliki residu asam amino yang sama dengan ligan standar. Fruktosa-6-fosfat dipilih menjadi ligan standar berdasarkan reaksi enzimatis yang terjadi. Galokatekin memiliki afinitas yang tinggi dengan GlmS karena memiliki energi afinitas (ΔG) dan konstanta inhibisi yang rendah. Oleh karena itu, galokatekin merupakan inhibitor paling potensial sebagai penghambat sintesis dinding sel bakteri.
Keyword: Catechin, Epicatechin, Epigalocatechin, Galocatechin, GlmS, Camellia sinensis, Antim flamation, Green tea, Antidiabetic, Anti bacterial

Judul: Molecular Docking of Flavonoid Compounds Against  Streptococcus mutans Glucosyltransferase Inhibition as Antibiofilm
Abstrak: Penyebab terjadinya karies gigi yaitu plak yang berada pada permukaan gigi dalam bentuk biofilm. Bakteri Streptococcus mutans berperan dalam pembentukan biofilm dan menghasilkan enzim glukosiltransferase yang dapat mengkatalisis pembentukan ekstra polisakarida. Beberapa senyawa flavonoid diketahui dapat menghambat sintesis biofilm. Oleh karena itu, senyawa flavonoid berpotensi untuk dikembangkan sebagai antibiofilm untuk pencegahan karies gigi. Penelitian ini bertujuan menentukan senyawa flavonoid dari penapisan virtual terhadap inhibisi glukosiltransferase pada S. mutans sebagai antibiofilm melalui penambatan molekuler dengan mempertimbangkan nilai energi bebas ikat, jenis pengikatan dan residu katalitik. Metode yang digunakan adalah preparasi ligan dan reseptor, penapisan virtual dan penambatan molekuler. Hasil penapisan virtual dari 87 senyawa flavonoid, diperoleh 36 senyawa yang dapat menginhibisi glukosiltansferase. Hasil penambatan molekuler menunjukkan 9 ligan yang dapat menghambat glukosiltransferase dengan nilai energi bebas ikat lebih negatif dari ligan alami (maltosa). Likuiritigenin memiliki ΔG paling negatif yaitu -7,0 kkal/mol dan nilai Ki 7,39 µM. 9 ligan memiliki jenis pengikatan terbaik pada enzim glukosiltransferase. Senyawa yang berikatan pada 3 residu katalitik enzim glukosiltransferase yaitu taksifolin, gallokatekin, sakuranetin sedangkan 6 senyawa lain berikatan pada 2 residu katalitik., The cause of dental caries is plaque that is on the dental surface in the form of a biofilm. Streptococcus mutans bacteria play role in the formation of biofilms and produce glucosyltransferase enzyme that can catalyze the formation of extra polysaccharides. Several flavonoid compounds are known to inhibit biofilm synthesis. Therfore, flavonoid compounds have the potential to be developed as antibiofims for the prevention of dental caries. This research aims to determine polyphenolic compounds from virtual screening against glucosyltransferase inhibition in S. mutans as an antibiofilm through molecular docking by considering the value of binding free energy, type of binding and catalytic residue. The methods used are ligand and receptor preparation, virtual screening and molecular docking. The results of virtual screening of 87 polyphenolic compounds, obtained 36 compounds that could inhibit glucosyltransferase. Molecular docking results showed 9 ligans that could inhibit glucosyltransferase with binding free energy value more negative than the native ligand (maltose). Liquiritigenin has the most negative ΔG which is -7,0 kkal/mol and Ki value of 7,39 µM. Compounds that bind to 3 catalytic residues of glucosyltransferase enzyme are taxifolin, gallocatechin, sakuranetin while 6 other compounds bind to 2 catalytic residues.
Keyword: biofilm, glucosyltransferase, molecular docking, S. mutans

Judul: Biology and ecology of the buffalo fly, haematobia exigua de meijere (diptera:muscidae)
Abstrak: The life history of the buffalo fly was observed at room temperature of 27°-29.5°C and at a relative humidity of 48-68 percent. The eggs hatched after 17-22 hours, with an average of 18 hours. First instar larvae measured 1.25 + 0.16 mm long and 0.27 + 0.037 mm wide. reach the second larval stage. It took 6-12 hours to the second instar larvae measured 2.676 +0.187 mm long and 0.353 +0.028 mm wide. The second instar took about 12-24 hours to reach the third larval stage. The third instar measured 6.833 + 0.189 mm long and 0.919 + 0.051 mm wide. It took about 2-3 days for the third instar to become pupae. Duration of the pupal stage was about 5-7 days before the adults emerged. Under laboratory condition, the buffalo fly completed its life cycle in 9.5 to 10.5 days, whereas under field condition it took 9-14 days with an average of 10.5 days. The growth ratio which was based on the measurements of the cephalo-pharyngeal skeleton of each instar was 1.797. The preoviposition period was 8-12 days and mating usually occurred on the 6th or 7th day. The longevity of the male was 29 days, whereas it was 32 days in the female. The range of egg production under laboratory condition was between 20-139 per female fly. The belly and hind legs of the carabao were the most preferred habitat either during cloudy and cool dry or shiny and warm day. When the weather was clear and the carabao was in the shade, the flies tended to be more distributed particularly on the shoulder, dewlap, back and horns. The carabaos had relatively fewer Musca sp. and Stomoxys calcitrans than cattle; never the less carabaos had a higher infestation of buffalo fly than cattle. Oviposition occured either during the day or night but the buffalo flies were more active during the night than in the day time. The effect of various lengths of exposure time of manure in relation to the oviposition was profound. observed, the maximum number of the buffalo flies was occurred when the dung was exposed for 30 minutes. With increasing time of exposure the number and variety of insects also increase. It was evident that Sepsidae and psychodidae were the most dominant insects emerging from the dung. The number of buffalo flies also increased with increasing
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