Judul: Synthesis of antibacterial hydrogels based on carboxymethyl cellulose-succinic acid-AgNO3
Abstrak: Hidrogel berbasis karboksimetil selulosa (CMC) memiliki potensi yang baik untuk digunakan sebagai penutup luka. CMC direaksikan dengan asam suksinat (AS) sebagai agen pengikat silang dan AgNO3 sebagai zat antibakteri. Penelitian ini bertujuan menyintesis hidrogel antibakteri berbasis CMC-AS-AgNO3, mempelajari ciri-ciri, dan potensinya sebagai zat antibakteri. CMC yang digunakan berasal dari selulosa bakteri. CMC tersebut memiliki nilai kadar air sebesar 9%, pH 4.6, dan derajat substitusi sebesar 0.24. Campuran CMC dan asam suksinat ditambah AgNO3 dengan ragam konsentrasi 0.2%, 0.4%, dan 0.6%. Peningkatan konsentrasi AgNO3 mengakibatkan peningkatan kemampuan pembengkakan hidrogel. Peningkatan konsentrasi AgNO3 juga meningkatkan zona inhibisi CMC-AS-AgNO3 terhadap bakteri Escherichia coli dan Staphylococcus aureus. Zona inhibisi terluas dihasilkan oleh CMC-AS-AgNO3 0.6% dengan diameter zona inhibisi sebesar 17 mm terhadap bakteri E. coli dan 12 mm terhadap bakteri S. aureus. Hidrogel CMC-AS-AgNO3 dicirikan menggunakan mikroskop elektron payaran dan difraktometer sinar-X.
Keyword: antibakteri, CMC-AS-AgNO3, hidrogel, zona inhibisi

Judul: Sintesis Hidrogel Antibakteri Berbasis Karboksimetil Selulosa- TiO2
Abstrak: Carboxymethyl cellulose (CMC) hydrogels can be synthesized from bacterial cellulose. The reaction of CMC and succinic acid can be used as an antibacterial with the addition of TiO2 (Rutile). This study was to synthesize hydrogel-based antibacterial CMC-TiO2. The addition of succinic acid against CMC will form a crosslinking by the esterification reaction between the -OH group of succinic acid with polycarboxylic acid of CMC. The product was evaluated by the degree of substitution (DS), swelling ratio, water content, pH, the infrared spectrum, microphotographs, antibacterial test, and difractogram.The resulted DS was approximately 0.2368. The swelling ratio was affected by the TiO2 concentration. The higher the TiO2 concentration the higher the swelling ratio. CMC-succinic-TiO2 was able to inhibit Staphylococcus aureus and Escherichia coli in each TiO2 concentration. The increasing TiO2 concentration was followed by the higher capability of bacteria inhibition. Therefore, CMCsuccinic- TiO2 is potential as a material for antibacterial
Keyword: Bogor Agricultural University (IPB), TiO2, succinic acid, hydrogels, Carboxymethyl cellulose

Judul: Sifat-sifat Statistika Penduga Turunan Pertama dan Turunan Kedua Fungsi Intensitas Proses Poisson Periodik
Abstrak: This manuscript is concerned with estimation of the first and second derivatives of intensity function of a periodic Poisson process. It is considered the worst condition if there is only available one realization of periodic Poisson process observed in interval [0, n ]. It is assumed that the period of this process is known. The main problem discussed in this manuscript is the formulation of asymptotic approximations to the bias and variance of the estimators for the first and second derivatives of the intensity of the process considered. In addition, computer simulations were carried out to study the behaviour of these asymptotic approximations for finite sample size.
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