Judul: Identifikasi Dan Karakterisasi Gulma-Gulma Ruderal Invasif Di Kebun Raya Bogor
Abstrak: Invasive weeds become important issues in Indonesia due to ecological and economical production concern of agriculture. Plant invation effected consequences of very high ecological loss and economical cost. Several thing of economic cost be able to quantification such as herbiside cost and yield loss. The ecological loss is the priceless disadvantages and difficult to quantified eg ecosystem damage, decrease recreation area, extinct of certain species etc. This research intent on identify and characterization of ruderal invasive weeds, looking for spreading pattern along with those influence factors to get the precisely controlling method and to know economic consequences from the existense of ruderal invasive weeds in Kebun Raya Bogor. This researh used scoring method and continued with multivariate analysis which showed by dendogram. The dendogram is made by neighbour joining single linkage method. The results showed that there are seven species invasive weeds from six familly which divided into three groups according to its aggresiveness. Component of Group 1 is Dioscorea bulbifera L. (Dioscoreaceae) with total score 69. Group 2 consist of Cissus sicyoides L. (Vitaceae) with total score 75, Cissus nodosa L. (Vitaceae) with total score 67 and Mikania micrantha H.B.K. (Asteraceae) with total score 78. Group 3 consist of Ficus elastica Roxb. (Moraceae) with total score 56, Paraserianthes falcataria (Fabaceae) with total score 48 and Cecropia adenopus (cecropiaceae) total skor 45. Component of Group 1 and Group 2 are woody climber those included in kind of vines whereas component of Group 3 are kind of tree. Based on our investigation invasive weed species which have score more than 50 be able to made significant disturbance and threaten the ecosystem stabillity of Bogor Botanical Garden.
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Judul: Keanekaragaman dan Pola Sebaran Spesies Tumbuhan Asing Invasif di Cagar Alam Dungus Iwul, Bogor
Abstrak: Dungus Iwul Nature Reserve is one of the conservation area that is supposed getting invacived by alien plant species. The purpose of this research is to identify the composition and structure of forest vegetation, diversity and distribution patterns of invasive alien plant species in Dungus Iwul Nature Reserve. Data was colected by vegetation analysis with squared track and line combination. The composition of plant species that is identified in Dungus Iwul Nature Reserve consist 69 species of 34 families wich mostly Euphorbiaceae. Identified of invasive alien plant species consist 6 species from 4 families. They are: Clidemia hirta (Melastomataceae), Ageratum conyzoides (Asteraceae), Cynodon dactylon (Poaceae), Chromolaena odorata (Asteraceae), Mikania micrantha (Asteraceae) and Piper aduncum (Piperaceae). The distribution patterns of invasive alien plant species based on Morisita index was clumped
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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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