Judul: Pengembangan Urinoir Sebagai Pendetekisi Status Hidrasi Berbasis Arduino uno dan Sensor Warna
Abstrak: Telah dikembangkan urinoir sebagai alat pendeteksi status hidrasi memanfaatkan sensor TCS3200 mengacu pada warna urin yang diprogram menggunakan arduino uno. Data acuan pengelompokkan dibuat dalam database yang berisi notasi warna urin dan nilai RGB. Pengelompokkan warna didasarkan pada kertas PURI. Hasil pembacaan urin terbagi menjadi tiga yaitu terhidrasi dengan baik, dehidrasi ringan-sedang, dan dehidrasi berat. Hasil uji Spearman menunjukkan korelasi positif antara BJU dengan URITES dengan nilai p<0.05 dan nilai r 0.935. Hasil uji Bland-altman menunujukkan nilai Limit of agreement URITES dengan BJU maupun PURI berada dalam rentang -5 sampai 5 yang menunjukkan reabilitas yang baik.
Keyword: Arduino uno, BJU, PURI, sensor warna, status hidrasi

Judul: Rancang Bangun Alat Ukur Kemurnian Air Berbasis Arduino Nano.
Abstrak: Kemurnian air merupakan salah satu indikator mengukur kualitas air minum. Dalam penelitian ini kami membangun sebuah sistem yang dapat mengukur kemurnian air. Tingkat kekeruhan air dapat diukur menggunakan sensor TCS3200, sedangkan sensor konduktivitas untuk memeriksa keberadaan ion dalam air. Sensor TCS3200 diatur pada rentang 0 – 85 NTU (Nephelometric Turbidity Units), sedangkan sensor konduktivitas diatur tidak ada ion pada air aquades. Nilai keluaran dari sensor TCS3200 berupa nilai RGB (Red Green Blue) dan sensor konduktivitas berupa nilai ADC (Analog to Digital Converter). Hasilnya menunjukan bahwa sistem yang dibuat dapat menentukan tingkat kekeruhan air dan dapat menentukan keberadaan ion dalam air. Hasil pengukuran ditampilkan pada OLED berupa kesimpulan dalam pembacaan.
Keyword: aquades, kekeruhan air, sensor konduktivitas, sensor TCS3200.

Judul: Extracellular Expression of thermostable Geobacillus stearothermophilus T1.2RQ Lipase for Biodiesel Production
Abstrak: The extracellular expression of enzymes in an excellent secretion host such as Bacillus subtilis is a useful strategy for making enzymes of industrial significance more affordable by lowering the cost of its downstream processing. Lipases are a category of hydrolases that catalyze the hydrolysis of triglycerides to glycerol and free fatty acids. Also, lipases catalyze the hydrolysis and transesterification of other esters as well as the synthesis of esters. They can perform very specific biotransformation reactions and are widely used in food, organic synthesis, detergents, cosmetic, and pharmaceutical industries. Geobacillus stearothermophilus T1.2RQ lipase is an industrially-desired thermostable lipolytic enzyme with an excellent hydrolytic and transesterification activity. This study aimed to express T1.2RQ lipase, in B. subtilis WB800 and ensure its secretion into the extracellular medium. Three signal peptides (AmyQ, Epr, LipA) and two promoters (Pgrac01 and Pgrac100) were used in the secretory-expression of T1.2RQ lipase, based on five constructed expression vectors constructed by restriction cloning and PCR mutagenesis. Sangers sequencing was used to verify constructs to ensure they are in the correct reading frame. Recombinants vectors, pHT43 (plasmid control), pHT43-T1.2RQ, pHT43- T1.2RQ_AmyQ, pHT43-T1.2RQ_Epr, and pHT43-T1.2RQ_LipA, were transformed by electroporation into Bacillus subtilis WB800. The electroporation was successful with the optimum condition of 2500V, 200 ohms, 25µF, and 5milliseconds. Recombinant B. subtilis pHT43 (negative control) and pHT43-T1.2RQlip + signal peptides were streaked on the lipidic agar, LA+TBN. All four recombinants, including the negative control (B. subtilis WB800-pHT43), produced clear zones on the TBN agar plate after overnight incubation (fig 2), indicating the presence of a lipolytic enzyme in all of the recombinant B. subtilis cells. pHT43-T1.2RQlip + signal peptides (AmyQ, Epr, and LipA) have clear zones with significantly higher diameters than B. subtilis WB800-pHT43 (negative control). This phenomenon suggests that the recombinant thermostable lipase T1.2RQ introduced into these cells was successfully expressed, thereby increasing the lipolytic capability of its host cells T1.2RQ lipase was expressed in 50ml terrific broth medium (TB) and the expression induced with 1mM IPTG. Lipase activity assay using p-nitrophenyl esters showed that all three signal peptides directed the secretion of T1.2RQ lipase into the extracellular medium. Signal peptide, LipA, resulted in the highest extracellular activity of 5.6 U/mL, which corresponds to a 6-fold increase over the parent B. subtilis WB800 strain. Meanwhile, signal peptides, AmyQ and Epr produced 4.2 U/mL and 3.4 U/mL activity respectively. SDS-Zymogram analysis confirmed that T1.2RQ lipase was correctly processed and secreted in its original size of 44 kDa. An attempt to further increase lipase expression level by promoter optimization showed that, contrary to expectation, promoter Pgrac100 exhibited similar expression levels as the original Pgrac01. Nevertheless, the demonstration of the successful secretion of T1.2RQ lipase in this work confirms the latter as a promising approach for the industrial production of the enzyme
Keyword: Bacillus subtilis, Expression, Extracellular, Heterologous, Lipase, Thermostable