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- ZnSO4
Abstrak: Coconut water could be made into nata de coco that contain cellulose. The cellulose can be further chemically modified into cellulose derivates such as carboxymethyl cellulose (CMC). Then CMC was used as an antibacterial hydrogel materials using crosslinking agents such as succinic acid, and ZnSO4 as an antibacterial agent. The synthesized CMC was characterized for the degree of substitution, the pH of a CMC solution of 1%, and moisture content. The CMCsuccinic acid was characterized based on infrared spectra. The difractogram and microphotograph showed that ZnSO4 was not converted into ZnO. The surface analysis of the highest swelling of CMC-succinic acid-ZnSO4 hydrogel using scanning electron microscopy. The swelling ability of the hydrogel increase with the increasing ZnSO4 concentration. The antibacterial test showed that the synthesized hydrogel inhibited Staphylococcus aureus and Escherichia coli growth and potentialy used as an antibacterial hydrogel.
Keyword: Bogor Agricultural University (IPB), hydrogels, crosslinked CMC, cellulose modification, antibacterial activity

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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