Judul: Hubungan Kekerabatan Genus Pteris (Pteridaceae) Berdasarkan Sekuen Gen rbcl dan matK
Abstrak: Kajian ilmu evolusi pada masa modern saat ini dapat dijelaskan dalam beberapa aspek termasuk evolusi molekuler yang dapat menjelaskan hubungan kekerabatan antar satu spesies dengan spesies lain. Pteris merupakan marga tumbuhan paku yang sangat beranekaragam sehingga menarik untuk dipelajari hubungan kekerabatannya. Penelitian ini bertujuan mengetahui hubungan kekerabatan spesies Pteris berdasarkan sekuen gen rbcL dan matK. Metode penelitian meliputi seleksi sekuen taksa untuk gen rbcL dan matK pada genus Pteris dari genebank National Center for Biotechnology Information (NCBI), pensejajaran sekuen, dan analisis data. Sekuen gen rbcL dan matK diunduh kemudian dilakukan pensejajaran dengan aplikasi Unipro UGENE dan selanjutnya dilakukan konstruksi pohon filogeni dengan aplikasi Phylogeny Analysis Using Parsimony (PAUP). Konstruksi kladogram menggunakan metode maximum parsimony sedangkan konstruksi fenogram menggunakan metode Unweighted Pair Group Method with Arithmetic Average (UPGMA). Hasil konstruksi kladogram dan fenogram menunjukkan keselarasan pola percabangan yang membentuk dua klada utama (ingrup) serta satu klada outgroup. Pola percabangan (topologi) pada ingroup fenogram dan kladogram masing-masing gen memiliki keselarasan.
Keyword: fenogram, klada, kladogram, leluhur, sekuen gen

Judul: Characterization of The Reproductive Structure of Fern in Heath Forest of Mount Agung and Tebat Rasau Ibu, Belitung
Abstrak: Hutan kerangas merupakan hutan dengan vegetasi yang tumbuh pada tanah kaya pasir kuarsa, miskin hara, dan memiliki pH rendah. Hutan kerangas mendominasi sebagian ekosistem hutan di Belitung. Jenis vegetasi yang dapat tumbuh di hutan kerangas salah satunya tumbuhan paku. Penelitian ini bertujuan mengkarakterisasi struktur reproduksi tumbuhan paku yang tumbuh di hutan kerangas Gunung Agung dan Tebat Rasau Ibu, Belitung. Struktur reproduksi diamati dari daun fertil tumbuhan paku dengan menggunakan mikroskop stereo dan mikroskop majemuk yang dihubungkan dengan kamera optilab. Data disajikan dalam bentuk gambar, tabel dan kunci identifikasi, kemudian dianalisis secara deskriptif. Tumbuhan paku yang diamati bervariasi pada susunan dan letak sporangia yaitu sporangia dalam strobilus, segmen seperti jari di tepi daun, sorophore, dan sorus. Sorus berbentuk garis, bulat, dan tabung. Sebagian besar sorus terletak pada tepi daun dan di sekitar tulang daun lateral. Spora dari 12 jenis tumbuhan paku memiliki bentuk dasar elips dengan laesura garis, satu jenis bentuk bulat dan tujuh jenis berbentuk tetrahedral-globose dengan laesura triradiate. Ukuran spora yang dijumpai yaitu medium, besar, dan gigantik. Semua spora memiliki nilai rasio P/E <1,00 dengan tipe oblate, suboblate, dan peroblate. Permukaan perispora sangat beragam yaitu echinulate, cristate, plain/laevate, papillate, echinate, alate, reticulate, verrucate, granulate, globules, tuberculate, dan ridges., The heath forest is a forest with vegetation that grows on soils rich in quartz sand, deficient in nutrients, and have a low pH. The heath forest dominates some of the forest ecosystems in Belitung. One of the types of vegetation that can grow in the heath forest is pteridophytes. This study aimed to characterize the reproductive structure of pteridophytes growing in the heath forests of Mount Agung and Tebat Rasau Ibu, Belitung. Reproductive structures were observed from the fertile leaves of pteridophytes using a stereo microscope and a compound microscope connected to an optilab camera. The data obtained are presented in the form of figures, tables, and identification keys, then analyzed descriptively. The pteridophytes observed varied in the arrangement and location of the sporangia, namely sporangia in the strobilus, finger-like segments on the leaf margins, sorophore, and sorus. Sori are lines, round or tubular in shape. Most sori are located on the leaf margins and around the lateral veins. Spore of 12 species have an ellipsoid spore with linear aperture, one species has a spheroidal spore, and seven species have tetrahedral-globose spore with triradiate aperture. The size of the spores found is medium, large, and gigantic sizes. All spores had P/E ratio values <1,00, with oblate, suboblate, and peroblate spore types. The perispore surface is very diverse: echinulate, cristate, plain/laevate, papillate, echinate, alate, reticulate, verrucate, granulate, globules, tuberculate, and ridges.
Keyword: heath forest, perispore surface, pteridophytes, spore morphology

Judul: Synthesis of Molybdenum Trioxide (MoO3) by Electrochemical Method for Electrochromics Application
Abstrak: Molybdenum trioxide (MoO3) thin films have been deposited on glass substrates by electrochemical method using ammonium heptamolybdate tetrahydrate ((NH4)6Mo7O244H2O). The films were deposited onto glass substrates as the control temperature at 25○C and annealing treatment at 350○C for 30 mins. The MoO3 thin films were investigated by UV-Vis, X-ray diffraction techniques (XRD), Scanning Electron Microscopy (SEM). The JCPDS card show that orthorhombic MoO3 (α- phase) has been formed. Molybdenum trioxide MoO3 formation was also confirmed by JCPDS card no. 35-0609. The SEM photographs revealed that the spherical and rod-like morphology and their grains size increased with increasing of heating temperatures. The measurement results show that the MoO3 thin film prepared at 350°C transmited about 80% of the visible spectrum. The effect of different heat treatments on surface morphology, thickness and optical properties of the films are discussed in this thesis.
Keyword: Institut Pertanian Bogor, Bogor Agricultural University, IPB, Electrophoretics, electrodeposide, electrochromics, electrochromic materials, electrochromic mechanism