Judul: Diversity of morphology and reproductive structure of terrestrial pteridophytes in Bogor Agricultural University, Darmaga
Abstrak: Tumbuhan paku terestrial dan kerabatnya (Pteridophyta) di kampus Institut Pertanian Bogor - Darmaga telah teridentifikasi sebanyak 56 spesies, termasuk ke dalam 30 genus dan 18 famili. Karakter struktur vegetatif diamati dan dicatat untuk keperluan identifikasi dan pembuatan kunci identifikasi. Karakter struktur vegetatif yang diamati meliputi habitus, frond, stipe, dan sisik. Karakter struktur reproduksi yang diamati menggunakan mikroskop cahaya meliputi lokasi sori, tipe indusium, tipe spora, jumlah spora per sporangium, bentuk spora, perispor, dan ornamentasi eksin. Habitus dan tipe frond membedakan antar famili Pteridophyta, sedangkan bentuk frond membedakan antara genera dalam satu famili. Spesies dalam satu genus dapat dibedakan dari bentuk sisik dan tepi lamina. Lokasi sori, tipe spora, dan bentuk spora merupakan karakter pembeda antar famili. Tipe indusium dan bentuk spora membedakan genus dalam satu famili, sedangkan ornamentasi eksin dan perispor dapat membedakan spesies dalam satu genus. Bentuk spora yang ditemukan yaitu monolet, trilet, dan globose. Ornamentasi eksin yang ditemukan yaitu glabrous, granulate, cristate, pappilous, dan echinate. Kata kunci: Pteridophyta terestrial, kunci identifikasi, struktur reproduksi, spora, ornamentasi eksin., Terrestrial Pteridophytes in Darmaga campus of Bogor Agricultural University have been identified as many as 56 species, classified into 30 genera and 18 families. Vegetatif characters were examined and reported for identification and constructing identification key. The observed characters were habit, frond, stipe, and scale. The characters of reproductive structure observed using light microscope were sori location, indusium, spore type, spore number per sporangium, spore shape, perispore, and exin ornamentation. Habit and frond type can be used to distinguish among families of terrestrial Pteridophyta, while frond shape can be used to distinguish among genera within a family. Among species within a genus can be distinguished by scale and lamina margin. Sori location, spore type, and spore shape were differed among families. Indusium and spore shapes differenciated species within a genus. Three various spore shapes were found, monolete, trilete, and globose. Five exin ornamentation were observed, glabrous, granulate, cristate, pappilous, and echinate. Keywords: Terrestrial Pteridophytes, identification key, reproductive structure, spores, exin ornamentation.
Keyword: Pteridophyta terestrial, kunci identifikasi, struktur reproduksi, spora, ornamentasi eksin

Judul: Diversity of Reproductive Structures in Epiphytic Ferns in the Campus Area of IPB, Dramaga, Bogor
Abstrak: Institut Pertanian Bogor merupakan kampus dengan biodiversitas tinggi. Tumbuhan paku epifit menjadi salah satu tumbuhan yang sangat melimpah jumlah dan jenisnya, tetapi informasi struktur reproduksinya masih terbatas. Penelitian ini bertujuan mengkarakterisasi struktur reproduksi tumbuhan paku epifit yang tumbuh di kawasan kampus IPB, Dramaga, Bogor. Metode penelitian terdiri dari koleksi sorus, pengawetan dengan alkohol 70%, pengamatan menggunakan mikroskop majemuk yang dihubungkan pada kamera optilab, dan pengukuran menggunakan aplikasi imageRaster v2.1. Tumbuhan paku epifit yang diamati bervariasi pada susunan dan letak sorus serta ciri sporanya. Sorus berbentuk bulat dan garis. Sebagian besar sorus terletak pada tepi daun. Sebanyak 22 jenis tumbuhan paku yang memiliki spora bentuk monolete dengan laesura garis, satu jenis bentuk bulat, dan satu jenis bentuk tetrahedral-globose dengan laesura triradiate. Ukuran spora yang dijumpai yaitu medium, besar dan sangat besar. Semua spora memiliki nilai rasio P/E ≤1,00 dengan tipe peroblate, oblate, suboblate, oblate bulat dan prolate bulat. Permukaan perispora sangat beragam yaitu alate-angular, globules, shallow verrucae, verrucate, echinulate, tuberculate, rugate, globules, echinate, laevate, cristate, regulate, colliculate, granulose, dan costate-alate., Bogor Agricultural University is a campus with high biodiversity. Epiphytic ferns are one of the most abundant plants in terms of numbers and types, but information on their reproductive structures is still limited. This study aims to characterize the reproductive structure of epiphytic ferns that grow in the IPB campus area, Dramaga, Bogor. The research method consisted of a collection of sorus, preserving it with 70% alcohol, observing using a compound microscope connected to an optilab camera, and measuring using the imageRaster v2.1 application. The observed epiphytic ferns varied in the arrangement and location of the sorus and the characteristics of the spores. The sorus was round and line. Most of the sorus were located on the leaf margins. A total of 22 fern species had monolete spore with line laesura, one species had round spore, and one species had tetrahedral-globose spore with triradiate laesura. Spore sizes found were medium, large, and very large. All spores had a P/E ratio value of ≤1.00 with peroblate, oblate, suboblate, round oblate, and round prolate types. The surface of the perispora is very diverse, namely alate-angular, globules, shallow verrucae, verrucate, echinulate, tuberculate, rugate, globules, echinate, laevate, cristate, regulate, colliculate, granulose, and costate-alate.
Keyword: biodiversity, characterization of spores, perispore surface, sorus

Judul: Hydroxyapatite-Chitosan Composite Coating on Stainless Steel 316 to Improve Corrosion Resistance
Abstrak: Metals that were used in bone implantation should have good corrosion resistance that were not easily corroded when implanted into the body. Metal corrosion resistance of stainless steel 316 can be enhanced through the metal coating by hydroxyapatite-chitosan composite with composition ratio of hydroxyapatite (gram) and chitosan 3% (mL) 0.2:0, 0.2:0.1, 0.2:0.5, 0.2:1.0, and 0.2:1.5. Besides improving the corrosion resistance of metal, the presence of chitosan also maintain the position of hydroxyapatite on metal surfaces. Corrosion resistance increases with increasing amount of chitosan added and the best composition of hydroxyapatite-chitosan composite was 0.2:1.0.
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