Judul: Penyebaran Jenis Jirak (Symplocos Fasciculata Zoll.) di Resort Kawah Ratu Taman Nasional Gunung Halimun Salak, Jawa Barat
Abstrak: Jirak (Symplocos fasciculata Zoll.) adalah salah satu jenis asli di Taman Nasional Gunung Halimun Salak, terutama pada Resort Kawah Ratu. Tumbuhan ini dapat dimanfaatkan sebagai bahan pewarna alami, selain itu bagian tumbuhan seperti daun juga dapat dimakan dan dijadikan obat. Oleh karena manfaat yang dimiliki jirak, tumbuhan ini dirasa penting untuk dibudidayakan . Penelitian ini bertujuan menganalisis kerapatan dan pola persebaran jirak (Symplocos fasciculata Zoll.) di Resort Kawah Ratu Taman nasional Gunung Halimun Salak . Pengambilan data dilakukan di dua blok yang terdapat di Resort Kawah Ratu TNGHS , yaitu blok Leles dan blok Pamengpeuk dengan menggunakan metode petak tunggal . Hasil penelitian menunjukkan pola persebaran jirak pada kedua plok pengamatan adalah mengelompok., Jirak (Symplocos fasciculata Zoll) is one of the native species in the Gunung Halimun Salak National Park, especially in the Kawah Ratu resort. This plant can be used as a natural coloring agent, in addition to plant parts such as leaves can also be eaten and used as medicine. Because of the benefits of jirak, this plant is considered important to be cultivated. This study aims to analyze the density and distribution pattern of jirak (Symplocos fasciculata Zoll) at Kawah Ratu Resort, Gunung Halimun Salak National Park. Data collection was carried out in two blocks located at the Kawah Ratu Resort of Mount Halimun Salak National Park, namely the Leles block and the Pamengpeuk block using the single plot method. The results showed that jirak distribution pattern in the two observation blocks was grouped.
Keyword: Distribution, Jirak, Kawah Ratu Resort, Symplocos fasciculata Zoll, Gunung Halimun Salak National Park

Judul: Distribution of Puspa (Schima wallichii (DC.) Korth.) in Kawah Ratu Resort, Gunung Halimun Salak National Park, West Java
Abstrak: Puspa (Schima wallichii) merupakan jenis tumbuhan yang mendominasi di kawasan Taman Nasional Gunung Halimun Salak terutama di Resort Kawah Ratu. Jenis puspa termasuk salah satu jenis tumbuhan dataran tinggi yang dapat tumbuh di lahan kritis. Tujuan penelitian ini adalah untuk mengidentifikasi pola penyebaran dan potensi permudaan jenis puspa (S. wallichii) di Resort Kawah Ratu, Taman Nasional Gunung Halimun Salak, Jawa Barat. Pengambilan data dilakukan dengan analisis vegetasi dengan metode petak tunggal seluas 1 ha pada setiap lokasi. Penelitian dilakukan di Blok Pamengpeuk dan Blok Leles. Jenis yang ditemukan pada kedua lokasi penelitian sebanyak 98 jenis. Hasil penelitian menunjukkan pola penyebaran puspa (S. wallichii) adalah mengelompok, baik di Blok Pamengpeuk maupun di Blok Leles. Penyebaran mengelompok menandakan adanya pertumbuhan permudaan yang baik. Kemampuan regenerasi puspa di kedua lokasi tergolong baik karena jumlah individu permudaan puspa lebih banyak daripada individu pohonnya., Puspa (Schima wallichii) is a type of plant that dominates the area of Gunung Halimun Salak National Park, especially at Kawah Ratu Resort. Puspa type is one of the upland plant species that can grow in critical land. The objective of this study is to identify the distribution pattern and the potential for regeneration of puspa species (Schima wallichii) at Kawah Ratu Resort, Gunung Halimun Salak National Park, West Java. Data were collected by analyzing vegetation with a single plot method covering an area of 1 hectare at each location. The research was conducted in the Pamengpeuk Block and the Leles Block. The species found in the two research locations were 98 species. The results showed that the distribution pattern of puspa was clustered, both in the Pamengpeuk block and in the Leles block. A clustered spread indicates good youth growth. The ability of puspa regeneration in both locations was quite good because the number of puspa regeneration individuals was more than the individual trees.
Keyword: distribution, Gunung Halimun Salak National Park, Kawah Ratu Resort, puspa, Schima wallichii, distribution, Gunung Halimun Salak National Park, Kawah Ratu Resort, puspa, Schima wallichii

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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