Judul: Sintesis Nanosilika dengan Metode Hidrotermal
Abstrak: Nanosilika dapat disintesis dari ampas tebu, sekam padi dan pasir kuarsa dengan metode hidrotermal. Tujuan dari penelitian ini untuk mengetahui pengaruh suhu, waktu dan konsentrasi NaOH pada proses hidrotermal terhadap karakteristik nanosilika. Penelitian ini menggunakan data primer berupa perhitungan susut massa pada tahap preparasi sampel sebelum proses hidrotermal, dan data sekunder berupa hasil analisis uji XRD, XRF dan SEM-EDX. Abu ketel memiliki kandungan silika sebesar 49.69%, abu sekam padi 72.28% dan pasir kuarsa 69.3%. Setelah melewati proses hidrotermal, kandungan silika meningkat menjadi 78.75%, 98.78% dan 95%. Nanosilika abu ketel memiliki derajat kristalinitas tertinggi pada waktu reaksi 4 jam yaitu sebesar 51.45% dengan ukuran kristalit sebesar 42.64 nm. Pada nanosilika sekam padi hasil difraktogram memperlihatkan bahwa sampel dengan suhu 100 oC memiliki keteraturan susunan yang paling baik dan ukuran kristalit terkecil dihasilkan pada suhu 85 oC sebesar 6.27 nm. Sedangkan nanosilika pasir kuarsa dengan konsentrasi NaOH 7 M menunjukkan kristalinitas yang semakin baik dengan munculnya beberapa puncak difraksi dan ukuran kristal yang terbentuk sebesar 45.57 nm.
Keyword: abu ketel, hidrotermal, nanosilika, pasir kuarsa, sekam padi.

Judul: Sintesis Nanosilika dari Abu Ketel Industri Gula Mengguakan Metode Ko-presipitasi dengan Template Pati.
Abstrak: Boiler ash is by product of the sugar industry which is not yet widely used. Boiler ash is highly silica content that can be utilized as nanosilica. The purpose of this study to synthesis nanosilica using boiler ash with the addition of tapioca and corn starch as a template. This research aims to know the effect of tapioca and cornstarch on characteristic of nanosilica, and also give information about the aplication of nanosilica with starch template. The researchs consist of four part that is preparation of material, synthesis of silica, synthesis of nanosilica, and characterization of nanosilica. 49,69% bagasse ash is composed of silica and after the furnace at a temperature of 7000 C the furnace ash containing 78,75% silica. Characteristics of nanosilika was multiphase consist of quartz, tridimit, and krisrobalit phase with cristobalite as the predominant phase.The most high crystallinity of nanosilika was 82,070% at treatment without addition of the template and the smallest crystallinity was 49,063% on addition corn starch at 33,33%. Starch contain of amylose that have contributed on decreasing cristalinity of nanosilica. Particle size of nanosilika was more homegen with the addition of corn starch when PDI’s number was above 0,1. Observation by SEM showed that the particle has polygonal form and looks spreads. Commonly, the effect of starch as a template was decreased the particle size, distrubution of particle, cristalinity, and cristal size. Characteristic of nanosilika that produced by starch’s template can aplicate as a silica-polymer nanocomposit and as a filler for ceramic’s material.
Keyword: boiler ash, co-presipitation, nanosilica, starch

Judul: Bakteri dan Cacing Parasitik pada Hati dan Saluran Pencernaan Ikan Belut (Monopterus albus
Abstrak: This study aims to identified the bacterial and parasitic worms in the liver and gastrointestinal tract of eels. The identification of isolated bacteria was done by using Gram staining, triple sugar iron agar, citrate, indole and fermentation of sugar. Parasitic worms stained with KOH clove oil for semi-permanent coloring and Semichon's Acetocarmine for permanent staining. Pseudomonas maltophilia, Proteus mirabilis, Pseudomonas aeroginosa, Salmonella sp, and Vibrio cholerae was found in the liver, and Pseudomonas aeroginosa, Salmonella sp., Chromobacterium sp., Enterobacter aerogenes and Vibrio cholerae from the gastrointestinal tract. The results showed that there are two types of parasitic worms in the digestive tract, ie Procamallanus sp., And Acanthocephala sp ..
Keyword: digestive tract, liver, parasitic worms, bacteria, Monopterus albus