DIBA, Farah, Indonesia

• Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 2 (2009): Jurnal Ilmu Teknologi Hasil Hutan - Articles
  

  Pulai (Alstonia scholaris)  was classification as IV-V for strenght class and V for durability class. This means that pulai has a low quality. One effort to improved the quality of pulai wood was densification process. This research aimed to evaluation the physical, mechanical and durability of pulai wood before and after densification process and to evaluated the temperature and pressing time on resulted the best quality of pulai wood. Densification was conducted on 160 °C and  180 °C with three pressing time 40 minute, 50 minute and 60 minute respectively. Densification targetted was 30%. Physical and mechanical process was conducted based on  British Standard Methods No. 373 (1957), meanwhile durability test against subterranean termites was conducted with modified wood block test methods. Result of the research showed that densified pulai wood  has the highest quality on physical, mechanical and durability properties than pulai wood control. The best densified treatment was on 180 °C with pressing time 60 minute. Densification process has improve the quality of pulai wood on one level class.

   

  Keywords :  Alstonia sp, densification process, Coptotermes curvignathus

  
  Abstract  PDF
• Jurnal Ilmu dan Teknologi Hasil Hutan Vol. 2 No. 1 (2009): Jurnal Ilmu Teknologi Hasil Hutan - Articles
  

  Soldier from subterranean termites Coptotermes curvignathus eject a poison secretions as a defensive secretions to overcome their enemy. This research aimed to evaluation the toxicity of soldier defensive secretions extract in aquabidestilata, ethanol, ethyl acetate and n-hexane             solutions against Odontoponera denticulata ants. Filter paper with 200 µl extract were exposure to ants for 14 day.                    The first time ants mortality and time for all ants                  mortality were recorded. Result of the research showed that the first time ants mortality was on ethanol extract (15 minutes                after exposure), then followed on ethyl acetate extract,                  n-hexane extract and aquabidestilata extract for 30, 35 and 40 minutes respectively.The faster time for all ants mortality            was on ethanol extract (54 hour), then followed by ethyl acetate  extract, n-hexane extract and aquabidestilata extract for 74, 79 and 82 hour respectively. GCMS analysis showed that the bioactive compound on ethanol extract were pentadecanal and tetradecanal.

   

  Keywords : Soldier defensive secretions, toxicity, Coptotermes curvignathus, Odontoponera denticulata

  
  Abstract  PDF