142 research outputs found
Rasio Seks Jernang (Daemonorops Draco (Willd.)blume) Pada Populasi Alami Dan Budidaya: Implikasi Untuk Produksi Biji
Jernang (Daemonorops draco (Willd.) Blume) is a dioecious rattan species that produces resin on female individuals. The sex of jernang can only be identified from its inflorescences morphology. Sex survey was conducted in 5 populations of jernang, 3 populations of which in the Bukit Tigapuluh National Park (BTNP), 1 population in the secondary forest in Jambi province and 1 population in the area of rubber plantation in Jambi province. Chi-Squared test on the sex ratio of jernang showed that the ratio of the male to female in their natural habitat (Bengayoan and Tebo, 2 parts of the BTNP ecosystem and the Sepintun secondary forest) was distorted from the normal ratio of 1:1, while the cultivated jernang in Nunusan population (BTNPT) and Mandiangin were not significantly different from the normal sex ratio of 1:1. Female individuals from the cultivated population in the Mandiangin (planted in 1997) has an average number of stems per clump more on individual males (27.12) than females (26.92). The result of this study indicated that the D. draco has a good reproductive strategy and thus suitable for cultivation
Recommended from our members
Methods for environmental monitoring of DOE waste disposal and storage sites. Semiannual progress report, November 1, 1986--March 31, 1987
The Oak Ridge Research Institute has addressed the question of whether sulfate-reducing bacteria can be used in the remediation of heavy metal contamination. The authors have performed experiments in which mercury, lead, and cadmium have been removed from liquid media in which sulfate-reducing bacteria were growing. It is clear that heavy metals can be precipitated from solution by sulfate-reducers. The authors believe that the activity of these organisms can be enhanced to help stabilize mercury and other metals in waste holding pond sludges, sediments and in contaminated soils
Recommended from our members
Methods for environmental monitoring of DOE waste disposal and storage sites. Semiannual progress report, April 1--September 30, 1986
Sulfate-reducing bacteria were grown in media containing (1) mercury and (2) a mixture of heavy metals to determine if these bacteria could effectively precipitate heavy metals from an aqueous solutions. Previous studies have shown that (1) sulfate-reducing bacteria produce hydrogen sulfide and (2) that hydrogen sulfide reacts with various heavy metals producing insoluble complexes. Data from these studies showed that when bacteria were incubated with heavy metals for 2 to 4 days a marked decrease in the solubility of mercury, lead and cadmium resulted. For example, after incubation with sulfate-reducing bacteria 90% of the mercury, zinc, lead and cadmium, and 60% of the copper and iron were filterable. The results suggest that sulfate-reducing bacteria may be used to remove heavy metal contaminants from aqueous solutions
- …