Judul: Computational investigation of Graphene Quantum Dots  as Biosensor in Detecting Amino Acids
Abstrak: Asam amino terlibat dalam banyak proses biologis termasuk sintesis protein dan lemak sehingga deteksi asam amino dapat digunakan untuk prediksi kehadiran penyakit. Pendeteksian asam amino membutuhkan biosensor yang bersifat non toxic dan biokompabilitas yang baik seperti Graphene Quantum Dots (GQDs). Penelitian ini mempelajari secara teoritis aplikasi GQDs sebagai biosensor dalam mendeteksi asam amino yaitu asam glutamat, histidin, tirosin dan lisin. Penelitian ini menggunakan perhitungan DFT untuk mendapatkan hasil berupa sifat elektronik dan analisis energi sistem adsorpsi. Hasil perhitungan menunjukkan energy gap menjadi lebih kecil dan nilai energi total yang semakin negatif setelah diadsorpsi yang artinya GQDs memiliki sifat elektronik yang baik sebagai biosensor. Perhitungan TDDFT juga dilakukan untuk melihat sifat optik dengan menunjukkan spektrum absorpsinya. Namun sifat optik yang ditunjukkan GQDs sebagai biosensor kurang baik karena tidak dapat mendeteksi semua asam amino yang diuji., Amino acids are involved in many biological processes including the synthesis of proteins and fats, thus detection of amino acids can be used to predict the presence or absence of disease. Amino acid detection requires non-toxic and good biocompatibility biosensors such as Graphene Quantum Dots (GQDs). This research studies the theoretical application of GQDs as biosensors in detecting amino acids, namely glutamic acid, histidine, tyrosine and lysine. This study uses DFT calculations to obtain results in the form of electronic properties and energy analysis of adsorption system. The calculation results show that the energy gap becomes smaller and the total energy value becomes more negative after being adsorbed, which means that GQDs have good electronic properties as biosensors. TDDFT calculations are also carried out to see the optical properties by showing the absorption spectrum. However, the optical properties shown by GQDs as biosensors are not good because they cannot detect all the tested amino acids.
Keyword: adsorpsi, asam amino, biosensor, DFT, GQDs, spektrum absorpsi

Judul: Application of Graphene Oxide/Poly(3,4- ethylenedioxythiophene):poly(styrenesulfonate) Based Electrode for Noninvasive Uric Acid Sensor
Abstrak: Deteksi asam urat sangat diperlukan untuk memantau kadar asam urat dan mencegah penyakit yang ditimbulkannya. Pada penelitian ini, sensor elektrokimia berbasis elektrode karbon kaca (GCE) termodifikasi komposit grafena oksida (GO) dan poli(3,4-etilenadioksitiofena):poli(stirenasulfonat) (PEDOT:PSS) dikembangkan dan diaplikasikan untuk mengukur asam urat dalam larutan standar dan urine manusia. Kinerja elektrokimia GO/PEDOT:PSS/GCE diselidiki menggunakan teknik voltammetri pulsa diferensial (DPV). Pada kondisi optimalnya, GO/PEDOT:PSS/GCE menunjukkan kinerja analitik yang baik dengan rentang linear pada konsentrasi 10–200 μM dengan sensitivitas 0,0757 μA μM-1, serta limit deteksi dan kuantifikasi berturut-turut 5 μM dan 10 μM. Selain itu, sensor yang diusulkan menunjukkan stabilitas dan reprodusibilitas yang baik dengan selektivitas yang tinggi terhadap senyawa interferens. Elektrode yang dimodifikasi berhasil digunakan untuk menentukan kadar asam urat dalam sampel urine manusia dan menghasilkan data pengukuran yang tidak berbeda nyata dengan hasil pengukuran kit komersial EasyTouch., Uric acid detection becomes essential to monitor uric acid levels and prevent the disease it causes. In this study, an electrochemical sensor based on the modification of glassy carbon electrode (GCE) with graphene oxide (GO) and poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) composite was developed and applied to measure uric acid (UA) in standard solutions and human urine. The electrochemical performance was investigated using the differential pulse voltammetry (DPV) technique. Under the optimum condition, GO/PEDOT:PSS/GCE shows good linearity in the concentration range of 10–200 μM with a sensitivity of 0,0757 μA μM-1, detection and quantitation limit of 5 μM and 10 μM, respectively. Moreover, this proposed UA sensor exhibits good stability and reproducibility with excellent selectivity against interference. The modified electrode was applied to analyze uric acid (UA) levels in human urine samples, yielding no significant difference from the measurement results of EasyTouch commercial kits.
Keyword: electrochemistry, graphene oxide, PEDOT: PSS, uric acid, urine sample

Judul: Etno-ornitologi Burung Kancilan Flores (Pachycephala nudigula nudigula Hartert 1897) pada Masyarakat Lio di Taman Nasional Kelimutu
Abstrak: Bare-throathed whistler is one of several wild birds in Kelimutu National Park (TNKL) that is believed to have correlation with Lio Community‟s belief. The estimation of Bare-throated whistler‟s population in Kelimutu National Park was about 186.41-1668.07 individual by the density about 0.0389-0.3481 ind/ha with the sex ratio 6.2:1 that spreaded on area with height of 1100 – 1600 masl. The characteristic of Bare-throated whistler‟s habitat is a natural forest with various canopy level, high plant species diversity and high density. The habitat characteristics related to the availability of food in the form of insects, cover, safety and a nesting site. Generally the most of Lio community knew the existence of Bare-throated whistler directly or from their parents‟ stories. The perceptions of Lio Community to the Bare-throated whistler‟s existence is generally support the conservation efforts. The perceptions construct the Lio Community‟s atitude that tend to be conservative to the existence of Bare-throated whistler. The attitude shown by their behavior that not cathing the Bare-throated whistler from the TNKL‟s area or the outside. The attitude have an important role to the existence of Bare-throated whistler in Kelimutu National Park‟s area.
Keyword: