Judul: Gastroprotective Potential of Citronella Grass (Cymbopogon nardus) Infusion on Gastritis in Sprague Dawley Rats
Abstrak: Gastritis adalah peradangan pada lapisan mukosa lambung yang masih umum terjadi pada masyarakat Indonesia. Kondisi ini dapat disebabkan oleh pola makan yang buruk, stres, konsumsi kopi atau alkohol berlebihan, obat antiradang nonsteroid, dan merokok. Konsep “back to nature” menyebabkan masyarakat tertarik untuk memanfaatkan obat herbal dibandingkan dengan obat konvensional untuk mengatasi gastritis. Serai wangi (Cymbopogon nardus) merupakan tanaman yang umum digunakan dalam pengobatan tradisional untuk mengatasi berbagai penyakit. Tujuan dari penelitian ini adalah menganalisis potensi gastroprotektif dari infusa serai wangi terhadap tikus Sprague Dawley yang diinduksi gastritis menggunakan campuran etanol dan HCl. Penelitian ini dilakukan pada 26 tikus yang dibagi menjadi 5 kelompok. Tikus sebelumnya dipuasakan selama 18 jam. Semua tikus kecuali kelompok kontrol sehat diberikan perlakuan yaitu: air (kelompok HCl/etanol), omeprazole (kelompok omeprazole), infusa serai wangi 20% (kelompok P1), dan infusa serai wangi 40% (kelompok P2). Setelah 90 menit, keempat kelompok tersebut diberikan campuran HCl dan etanol menggunakan sonde lambung. Semua tikus lalu dieutanasia setelah 90 menit pemberian HCl dan etanol dan dilakukan koleksi lambung untuk pengukuran nilai pH cairan lambung dan analisis lapisan mukosa secara makroskopis dan mikroskopis. Hasil penelitian menunjukkan bahwa nilai pH dan skor kerusakan lambung pada kelompok yang diberikan infusa serai wangi masing-masing memiliki nilai yang lebih tinggi dan lebih rendah secara signifikan (P<0,05) dibandingkan dengan kelompok HCl/etanol. Temuan-temuan tersebut mengonfirmasi bahwa infusa serai wangi 20% dan 40% memiliki aktivitas gastroprotektif terhadap lesio pada lambung yang dihasilkan oleh HCl dan etanol. Tidak ditemukan adanya perbedaan yang signifikan (P>0,05) antara variabel kelompok infusa serai wangi dengan konsentrasi 20% dan 40%.
Keyword: citronella grass, Cymbopogon nardus, gastritis, gastroprotective, infusion

Judul: Efek Infusa Serai Dapur (Cymbopogon citratus) pada Kadar Glukosa dan Asam Urat Darah Tikus
Abstrak: Serai dapur (Cymbopogon citratus) merupakan salah satu tanaman rempah yang memiliki manfaat sebagai herbal. Serai dapur memiliki kandungan fitokimia berupa flavonoid, alkaloid, tanin, terpen, fenolik, antosianin, steroid, saponin, isoflavon, kumarin, lignin, katekin, isokatekin, dan asam askorbat. Penelitian ini bertujuan untuk melihat pengaruh pemberian infusa serai dapur (Cymbopogan citratus) 20% dan 80% terhadap kadar glukosa dan asam urat darah pada tikus. Sebanyak 30 ekor tikus jantan dibagi menjadi 3 kelompok yaitu kontrol, infusa serai 20%, dan infusa serai 80%. Sampel darah dikoleksi dari ekor kemudian dianalisa kadar glukosa dan asam urat menggunakan test meter (Easy Touch). Rataan kadar glukosa darah menunjukkan hasil yang bervariasi pada ketiga kelompok. Rataan kadar asam urat menunjukkan kecenderungan terjadinya penurunan pada ketiga kelompok. Penurunan kadar asam urat yang paling besar terlihat pada kelompok infusa serai 20%. Pemberian infusa serai dapur pada tikus menunjukkan kadar glukosa darah yang berfluktuasi dan berpotensi menurunkan kadar asam urat dalam darah., Kitchen lemongrass (Cymbopogon citratus) is one of the spice plants that has benefits as herbs. Lemongrass contains phytochemicals such as flavonoids, alkaloids, tannins, terpenes, phenolics, anthocyanins, steroids, saponins, isoflavones, coumarins, lignin, catechins, isocatechins, and ascorbic acid. This study aims to see the effect of giving 20% and 80% infusion of kitchen lemongrass (Cymbopogan citratus) on blood glucose and uric acid levels in rats. A total of 30 male rats were divided into 3 groups: control, 20% lemongrass infusa, and 80% lemongrass infusa. Blood samples were collected from the tail and then analyzed for glucose and uric acid levels using a test meter (Easy Touch). Mean blood glucose levels showed varying results in the three groups. Average uric acid levels showed a tendency to decrease in all three groups. The greatest decrease in uric acid levels was seen in the 20% lemongrass infusa group. Giving lemongrass infusion to rats shows fluctuating blood glucose levels and has the potential to reduce uric acid levels in the blood.
Keyword: asam urat, Glukosa, infusa, tikus, Cymbopogon citratus

Judul: Development of Face Recognition Model using Bi-2DPCA and Support Vector Machine
Abstrak: The human face is always used in the application of access control systems, identity authentication systems, surveillance systems and security systems. Some researh on face recognition has been proposed with a variety of methods, such as Eigen Faces, Fisher’s Linear Discriminant, Bayesian Networks, Neural Networks,Hidden Markov Model, and so on. But all the above mentioned methods have limitations, such as dealing with the size of the image and lighting and learning time are too long. In a study to obtain an alternative method for face recognition, Le TH and Bui L (2011) conducted research model of face recognition with Two- DimensionalPrincipal Component Analysis (2DPCA) and Support Vector Machine (SVM) using AT&T face image data. The results of these studies that the accuracy of face recognition use 2DPCA and SVM was 97.3% and PCA-SVM was 95.2%. Then in 2010, Bi-2DPCA uses as alternative method of face recognition performed by Yang J et al. (2010). In a study comparing methods of Bi-2DPCA, 2DPCA and PCA. The conclusion that the use of Bi-2DPCA generating and computational accuracy was better than 2DPCA and PCA Based on research conducted by Le TH and Bui L (2011) and Yang J et al. (2010), conducted research for the development of models of face recognition using dimension reduction technique Bi-2DPCA and Support Vector Machine (SVM) as pattern recognition. 1DPCA and 2DPCA dimension reduction technique are used as comparison measure dimensions and computing time than using Bi-2DPCA technique. To help SVM in recognizing human faces, SVM use linear, polynomial and radial basis function (RBF) kernel function. When using RBF kernel, used for the RBF kernel, the parameter for sigma is 2-15 up to 23 and the value of C starting from 2-5 up to 214 which have been used in a study conducted by Le TH and Bui L (2011). Facial image data used are taken from the ORL Face Database AT&T Laboratory, which contain 40 faces, each face with 10 images, and total of image 400 pieces. Validation is done by Leave-One-Out (LOO) cross validation, so that for each pair of extraction and classifier method is 10 trials. One against all method used to help SVM in classifying the ORL face data consists of 40 classes, to reduce the computational time. From the results of tests on 36 models of face recognition , Bi-2DPCA85% with the help of a linear kernel generates the highest level of face recognition accuracy of 94.25 %, and the lowest accuracy rate of 24.50 % was obtained with 1DPCA-kernel polynomial ordo 3 . While the lowest computational time of 15.34 seconds when component is used by 85 % computation time and a maximum of 252.68 seconds when component is 95 %. There are several things that could be concluded that: pattern accuracy on each kernel feature extraction are the same. This means that there is no relationship between the feature extraction used by the kernel to the SVM. The second is, in this study SVM cannot classify large dimension data. From the results of tests on 36 models of face recognition, Bi2DPCA85% with the help
Keyword: Face Recognition, Principle Component Analysis, Kernel, Support Vector Machine, Leave-one Out Cross Validation