This study reports on the evaluation of biodegradation and biosorption mechanism of indigenous bacteria on azo dye decolorization. The bacterial strains were screened for their ability in decolorizing of selected toxic azo dyes in aqueous solution. Lysinibacillus fusiformis W1B6 showed the highest decolorizing of about 96% of methyl red within 2 h, with the specific growth rate of 0.273/ h. The optimum decolorization under aerobic condition was achieved at pH 7.5, 30 AE 2 C, inoculum 10% (v/v), and initial dye concentration of 100 mg/L. Spectrum analysis confirmed biodegradation as the principal mechanism of decolorization, although biosorption also occurred. Extracellular and intracellular azoreductase, laccase, and lignin peroxidase plays a role in the oxidoreductive mechanism of decolorization. The absorption isotherms fitted with the Langmuir equation and the reaction kinetics of methyl red decolorization followed a pseudo first-order.
This paper reports on the comparative characteristics and properties of the metabolites derived from methyl red (MR) decolorization by Lysinibacillus fusiformis strain W1B6 under static and shaking conditions. A batch culture system was used to investigate the effect of aeration on azoreductase activity in the biodegradation process, transformation of colour removal and the metabolite products. Biodegradation analysis was monitored using Fourier transform infrared spectroscopy and high-performance liquid chromatography while metabolites were determined using gas chromatography–mass spectroscopy. Phytotoxicity and anti-microbial tests were also conducted to detect the toxicity of metabolites. The results showed that this strain grew more rapidly under shaking conditions while azoreductase activity increased more rapidly under static conditions. Despite that, no significant difference in the decolorization was observed under both static and shaking conditions with up to 96% and 93.6% decolorization achieved, respectively, within 4 h of incubation. MR was degraded into two fragmented compounds, i.e. 2-aminobenzoic acid and N,N -dimethyl-1.4-benzenediamine. The concentration of 2-amino benzoic acid was higher under static conditions resulting the biotransformation of 2-amino benzoic acid into methyl anthranilate more rapidly under static conditions. Other metabolites were also detected as intermediate biotransformation products and by-products. Less or no toxic effect was found in the metabolite degradation products under both culture conditions.
Pandemi COVID-19 merupakan sebuah krisis global yang tidak hanya mengancam kesehatan masyarakat secara fisik, namun juga secara mental. Begitu banyak berita buruk yang diterima, membuat masyarakat cemas akan hidup diri mereka sendiri, keluarga, teman terdekat, dan bahkan lingkungan sekitarnya. Kecemasan berlebihan pada masa karantina dapat meningkatkan risiko depresi hingga gejala stres pascatrauma. Sebagai upaya mengatasi persoalan tersebut, penulis melalui Lembaga Penelitian dan Pengabdian Masyarakat Universitas Abdurrab bekerja sama dengan pakar dari Master Student of Professional Psychology Universitas Airlangga melaksanakan pengabdian masyarakat dengan tema sosialisasi mengatasi mental health terdampak COVID-19 melalui video edukasi, karena pandemi ini sangat mempengaruhi kesehatan mental masyarakat dan harus diatasi dengan beberapa cara seperti melalukan rutinitas yang bermanfaat, lebih bijak memilih informasi yang benar, serta tetap menjaga komunikasi dengan keluarga dan orang terdekat.
Internet is one of the needs of the community, especially among education and academics such as universities. The high level of internet users is not comparable with the facilities owned by an agency, this makes the internet network manager in Higher Education feel difficult. The cause of the problem that is always a problem is the speed and internet connection is always disjointed, resulting in the slow loading process data while browsing, both at the time of download and at the time of upload. To make internet users in campus area balanced and stable then need bandwidth management based on traffic usage of internet path better. Bandwidth management that can stabilize traffic lanes and equal bandwidth distribution, it can use bandwidth management by Hierarchical Token Bucket (HTB) method. The calculation result in HTB method testing through file download, the average value obtained by TIPHON category standard for throughtput value index is 2 with "Medium" category, delay parameter index is 4 with "Very Good" category, jitter parameter index is 3 with the "Good" category and the packet loss parameter index is 4 with the "Very Good" category.
Kebakaran hutan adalah areal pembakaran hutan atau lahan yang luas atau kecil. Kebakaran hutan biasanya tidak terkendali, begitu terjadi akan membakar apa saja yang ada di sekitarnya. Ada dua penyebabnya, salah satunya adalah pembakaran alami atau pembakaran ulah manusia. Salah satu kebakaran akibat ulah manusia adalah pembakaran masyarakat sekitar hutan untuk merebut kembali atau membuka lahan pertanian atau hutan buatan. Masyarakat berkeyakinan bahwa penggunaan api untuk membuka lahan tidak memakan waktu lama dan lebih ekonomis, jika penggunaan api tidak tepat dapat menyebabkan hutan terbakar. Kebakaran hutan di Provinsi Riau sering terjadi. Akan tetapi, masyarakat minim mengetahui adanya kebakaran hutan di Riau karena kurangnya media informasi mengenai dimana saja terjadinya titik api kebakaran hutan. Dengan adanya aplikasi ini dapat membantu masyarakat untuk lebih mengetahui dimana saja area titik api yang pernah terbakar. Aplikasi ini terdiri dari 2 level akses yaitu: admin dan user. Untuk admin dan user proses pembuatannya menggunakan aplikasi Android Studio dengan java sebagai bahasa pemogramannya, aplikasi ini menggunakan Firebase sebagai Database untuk mengetahui area lokasi titik kebakaran api menggunakan Google Maps API. Pengujian pada aplikasi dibuat untuk menguji apakah aplikasi telah berjalan sesuai dengan yang diinginkan. Hasil pengujian menggunakan metode blackbox testing.
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