Impact of Rational Logging on the Regeneration of Plant Species in the South-West of the Central African Republic
Innocent Kossa Koyakodo,
Fidèle Mialoundama,
Guy Gildas Sosthène Zima
Issue:
Volume 8, Issue 1, June 2020
Pages:
1-7
Received:
18 March 2019
Accepted:
23 June 2019
Published:
19 May 2020
Abstract: Nowadays, logging must be practiced in a rational manner in order to reduce the negative impacts on the environment and thus leading to the perpetuation of natural resources. This study was carried out in one of the concessions of logging companyVicwood Centrafrique «VICA»” in the South-West of the Central African Republic. The objective was to evaluate the effects of rational logging on the regeneration of plant species. From the different methodologies (bibliographic review, semi-structured interview, technical evaluation), data were collected, processed and analysed. Results obtained showed that the proportion of deforested area in an annual cutting base within the framework of a sustainable exploitation is 0.27% for an area of 100ha. Strict compliance with the upstream planning based on a good exploitation inventory made it possible to define the characteristics of the roads to be built which will have a low impact on the regeneration of the plant resources. The beneficial role of the management team to support the units on the field according to the management rules focused on (i) social aspects, (ii) mapping Geographical Information System and (iii) the traceability system for monitoring of the log from the prospecting period to when evacuation takes place. This has effectively contributed to the sustainable management of these ecosystems for the benefit of the future generation.
Abstract: Nowadays, logging must be practiced in a rational manner in order to reduce the negative impacts on the environment and thus leading to the perpetuation of natural resources. This study was carried out in one of the concessions of logging companyVicwood Centrafrique «VICA»” in the South-West of the Central African Republic. The objective was to eva...
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Mesoporous Silica-Coated β-TCP Granules Prepared Using Alginate and In vitro Evaluation
Atsumasa Shishido,
Yudai Shigarami,
Erath Beeran Ansar,
Hari Krishna Varma,
Yoshiyuki Yokogawa
Issue:
Volume 8, Issue 1, June 2020
Pages:
8-13
Received:
9 June 2020
Accepted:
23 June 2020
Published:
13 July 2020
Abstract: β-Tricalcium phosphate (β-TCP) is widely used, along with bone-derived growth factor, due to its poor osteogenic ability. Mesoporous silica (MPS)-coated β-tricalcium phosphate (β-TCP) granules were prepared to improve protein loading capability, and in vitro evaluations of this material were carried out. β-TCP powder containing 2 wt% Al2O3 and 6 wt% SiO2 was prepared via mechanochemical synthesis. A sodium alginate solution containing β-TCP powder was transferred into a calcium chloride solution, and the obtained spherical beads were heated at 1100 to 1300°C to produce TCP granules. The X-ray diffraction (XRD) profile of the β-TCP granules containing 2 wt% Al2O3 and 6 wt% SiO2 was identical to that of the single β-TCP phase when heated to 1300°C. The compressive strengths of the TCP granules prepared using alginate were remarkably improved compared with those of TCP granules prepared using a pan-type granulator. A silica interlayer was formed on the β-TCP granules containing 2 wt% Al2O3 and 6 wt% SiO2 via magnetron sputtering prior to the coating of the MPS. MPS coatings on β-TCP granules containing 2 wt% Al2O3 and 6 wt% SiO2 was carried out by a dip-coating method after silica interlayer coatings, and the β-TCP granules containing 2 wt% Al2O3 and 6 wt% SiO2 were covered by the MPS particles. A silica interlayer may offer bonding between the β-TCP granules and MPS coating. The Alamar blue assay of the MPS-coated TCP granules exhibited excellent cell viability as well as a high protein-adsorption capacity.
Abstract: β-Tricalcium phosphate (β-TCP) is widely used, along with bone-derived growth factor, due to its poor osteogenic ability. Mesoporous silica (MPS)-coated β-tricalcium phosphate (β-TCP) granules were prepared to improve protein loading capability, and in vitro evaluations of this material were carried out. β-TCP powder containing 2 wt% Al2O3 and 6 wt...
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