Judul: Demografi Kumbang Penyerbuk Kelapa Sawit, Elaeidobius kamerunicus (Coleoptera : Curculionidae)
Abstrak: Oil palm is a specific host plant for the weevil E. kamerunicus. These weevils can only eat, lay eggs, and breed in oil palm male flowers. This study aimed to study demographics of E. kamerunicus as oil palm pollinators, such as biology, life table, and the survivorship. A pair of E. kamerunicus were reared in the box contained male flowers spikelet. At the base of spikelet were immersed by water at film bottle. Body and sex ratio were observed during development of egg to adult. Demographic study were analyzed based on gross reproductive rate (G), net reproductive rate (R0), generation time (T), and intrinsic growth rate (r). In average life cycle of E. kamerunicus was 33 days i.e. 2.5 days of egg, 12 days of larvae, 5 days of pupae, and 15 days of male and 18 day of female adult, respectively. Demography of the weevil were: gross reproductive rate was 6 individuals, net reproductive rate was 3 individuals, generation time was 15 days, and intrinsic growth rate was 0.06. In a life cycle, fecundity of E. kamerunicus was 27 eggs and mortality from egg to adult was 72.9%. Based on the survivorship curve, mortality in early phase was constant and increase at adult phase.
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Judul: Dinamika Populasi Kumbang Elaeidobius kamerunicus (Curculionidae : Coleoptera) sebagai Penyerbuk Kelapa Sawit (Elaeis guineensis Jacq) Umur Enam Tahun.
Abstrak: Elaeidobius kamerunicus is one of the weevil pollinator of oil palm. Weevil pollinator, E. kamerunicus in plantation is useful to increase fruit set. Continuity of the oil palm pollination require minimal amount of the weevil. This study addressed to know population dynamics of the weevil and environmental factors that affected the weevil population. Weevil population was observed in male flower of oil palm plants of six years after planting. Weevil population was observed by sampling method in male flowers spikelet in May, July, and October 2009. Relationship between environment factors and weevil population was analyzed by principal component analysis (PCA). A result showed that population of the weevil was highest in October. The weevil populations related to bunch size and weevil populations found highly in the morning. Air temperature, relative humidity, and light intensity did not significantly affect to the weevil population.
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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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