Judul: Studi Tipologi Wilayah Jelajah Kelompok Lutung (Trachypithecus auratus, Geoffrey 1812) DI Taman Nasional Bromo Tengger Semeru
Abstrak: Lutung (Trachypithecus auratus) is one of endemic primate species which its population endangered. Primates life was influenced by habitat. Part of habitat which occupied by an animals or populations in normal daily activities is homerange. Homerange typology data was important in wildlife management, however information about that was very limited. The aim of the research was to determine factors influencing homerange size, and homerange typology of lutung. The research conducted at Bromo Tengger Semeru National Park from Desember 2009 until February 2010. Parameters observed were homerange size, trajectori distance, physical and vegetation factor, information about food dan sleeping trees, and lutung group characteristics The homerange size of langur calculated using convex poligon methode. Vegetation characteristic calculated with vegetation analized kuadrat methode. Result of the research found that langur’s homerange lied at 1158 – 2010 altitude, temperatur 16,5 -20,5ºC. The vegetation density was 75 – 238 individual/hectare, spesies richnes indeks 9,15 – 12,1, feeding trees quantity 4 – 14, and trees relatif density 12-26,67 %. There were 9 groups of lutung, 6 – 33 individu each, one male/multimale group. Based on multiple linier regression, the homerange size was influence by group size (X1) trees density (X9) and tree species numbers (X10). The equation formula was Y = -5,625 + 0,676 X1 + 0,157X10 + 0,10X9 (R = 0,989). Homerange size Neu’s methods of preference index showed that Quercus sundaicus, Ficus sp. and Litsea sp. were sleeping trees prefered of lutung group in the study periode. Based on the equation, homerange size will larger when group size, vegetation density and tree species number increased. Management implication was improve spesies number and Quality of langur feeding and sleeping trees..
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Judul: Studi Habitat Lutung Jawa (Trachypithecus auratus E. Geoffroy 1812) di Resort PTN Cimande, Taman Nasional Gunung Gede Pangrango
Abstrak: Lutung jawa (Trachyppithecus auratus) adalah primata endemik Indonesia yang termasuk kategori rentan dalam IUCN. Keberadaan lutung akan tetap berlanjut dengan tersedianya habitat yang baik, sehingga informasi mengenai kondisi habitat lutung jawa diperlukan untuk pengelolaan habitat yang lebih baik. Penelitian mengenai habitat lutung jawa bertujuan mengidentifikasi komponen-komponen habitat, mengidentifikasi jenis tumbuhan pakan dan bagian yang dimakan, serta mengukur ketersediaan tumbuhan pakan. Penelitian dilakukan pada bulan Maret 2024 di RPTN Cimande, Taman Nasional Gunung Gede Pangrango. Data penelitian didapatkan dengan melakukan observasi lapang dan pengukuran di lapangan. Hasil penelitian menunjukkan bahwa lutung dapat dijumpai pada ketinggian 684-884 mdpl dengan kelerengan 0%-45%. Jenis tumbuhan yang sering dikonsumsi lutung ialah teureup, ki bolong, dan kayu afrika, dengan perbandingan bagian tumbuhan yang dimakan yakni 58,82% daun dan 41,18% buah. Keberadaan tumbuhan pakan mendominasi pada habitat lutung jawa, sehingga ketersediaannya dapat dikatakan melimpah. Selama penelitian dijumpai primata selain lutung jawa yakni monyet ekor panjang, surili, dan owa jawa, namun tidak teramati terjadinya konflik antar primata., Javan langur (Trachypithecus auratus) is an endemic primate in Indonesia that is categorized as vulnerable by IUCN. The existence of langurs will continue with the availability of suitable habitat, so information regarding the habitat conditions of javan langurs is needed for better habitat management. Research on javan langur habitat aims to identify habitat components, types of food plants and the parts they eat, and measure the availability of food plants. The research was conducted in March 2024 at RPTN Cimande, Gunung Gede Pangrango National Park. Research data were obtained by conducting field observations and measurements in the field. The research results show that langurs can be found at an altitude of 684-884 meters above sea level with a slope of 0%-45%. The plants often consumed by langurs are teureup, ki bolong, and kayu afrika, with the ratio of plant parts eaten being 58,82% leaves and 41,18% fruit. Food plants dominate the javan langur habitat, so their availability is abundant. During the research, primates other than javan langurs were found, namely long-tailed monkey, surili, and javan gibbon, but no conflict between primates were observed.
Keyword: food plants, habitat, javan langur

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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