No abstract

No abstract

Kusmana C, Hidayat T, Istomo, Rusdiana O. 2018. Growth performance of Bruguiera gymnorrhiza derived from cut-propagule seedling. Biodiversitas 19: 208-214. The availability and existence of Bruguiera gymnorrhiza seed sources is getting decreased. This causes the generative reproduction of this plant is limited. The present research was carried out to study the growth performance of B. gymnorrhiza derived from vegetative cut-propagule seedling by employing different type of cut-propagule, the provision of root promoting hormones, and the provision of NPK fertilizer. The research was conducted at the Greenhouse for 6 months using a completely randomized design (CRD) 3x3x2 factorial with five replications. The results showed that B. gymnorrhiza could be propagated by cut-propagule. Seedlings growth which derived from complete propagule apparently had a better performance than those derived from cut-propagule. Roots derived from complete propagule and the bottom part of cut-propagule grow faster than the top part of cut-propagule. Two types of shoot such as shoot existing before planting which was derived from complete propagule and top part of cut-propagule; and shoots existing after planting called as adventitious shoot derived from the bottom part of cut-propagule has been formed. Unfortunately, new complete shoots derived from the bottom part of cut-propagule was not formed. Furthermore, there was no significant effect of root promoting hormone and NPK fertilizer induction on the shoot and root growth of B. gymnorrhiza.

Abstract. Isolation of needle-shaped bacterial cellulose nanocrystalline with a diameter of 16-64 nm, a fiber length of 258-806 nm, and a degree of crystallinity of 64% from pineapple peel waste using an acid hydrolysis process was investigated. Experimental showed that selective concentration of acid played important roles in isolating the bacterial cellulose nanocrystalline from the cellulose source. To achieve the successful isolation of bacterial cellulose nanocrystalline, various acid concentrations were tested. To confirm the effect of acid concentration on the successful isolation process, the reaction conditions were fixed at a temperature of 50°C, a hydrolysis time of 30 minutes, and a bacterial cellulose-to-acid ratio of 1:50. Pineapple peel waste was used as a model for a cellulose source because to the best of our knowledge, there is no report on the use of this raw material for producing bacterial cellulose nanocrystalline. In fact, this material can be used as an alternative for ecofriendly and cost-free cellulose sources. Therefore, understanding in how to isolate bacterial cellulose nanocrystalline from pineapple peel waste has the potential for large-scale production of inexpensive cellulose nanocrystalline.

Mangrove forest is a unique ecosystem that plays important roles to climate change control, as carbon sink and CO2 absorbing from the atmosphere. This research was aimed to estimate the potential of above-ground biomass and carbon stocks of Ciletuh mangrove forest, West Java, Indonesia. Mangrove forest area and occupation of dominant species were mapped using Geographical Information System, meanwhile species composition and forest structure was sampled using 198 plots (20 m × 20 m each) systematically spread out at studied forest area. Vegetation analysis data were used to estimate the potential of above-ground biomass and carbon stocks. Above-ground biomass and carbon stock of mangrove species was estimated using allometric models that already available. The results showed that mangrove forest in Ciletuh covered an area amounted to 8 ha. There were 18 tree mangrove species dominated by species of non-Rhizophoraceae belonging to 14 genera of 11 families. Above-ground biomass of Ciletuh mangrove forest was estimated at 31.78 t ha−1, carbon stock at 14.93 t C ha−1, and CO2 absorption at 54.68 t ha−1.