T<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">his paper aims to analyze the competitive position of Port of D...T<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">his paper aims to analyze the competitive position of Port of Douala in Central African ports market structure. In other words, it consists of measuring port market level and competitiveness through an assessment of their growth rate and market share. </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">The purpose of the paper is to </span><span style="font-family:Verdana;">provide us with information on periodical changing status of ports competing with each other. It also provides us with an effective managerial tool to port operators in the assessment of ports market share and position. </span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">For doing so, the measurement technique as Shift-Share Analysis was applied in the study by using a panel dataset of the 7 selected ports of Central Africa sub-region from 2008 to 2018. The paper used the recent dynamics and characteristics of port market in terms of port throughputs to compare the yearly trend and market share. By conducting the study of the market growth rate model, the findings showed that the Port of Douala was the top leader of the market in 2009, 2015, 2016 and 2018. The findings also revealed the competitive positions of these ports under study have changed over the period of study due to the significant change of their market share with average growth rates. The final results showed that several determinant factors have affected the present hierarchy of competitiveness level in the selected ports market especially with small and medium size ports that are strengthening their positions vis-a-vis larger ones. However, the results could be used for analyzing the relative efficiency and overall performance of the Central African Sub-regional seaports including the Cameroonian ports.</span></span></span>展开更多
The effects of pigment glands and gossypol on the somatic cell culture of upland cotton were studied, using the materials as follows: three pairs of glanded and gland less upland cotton near isogenic lines, TM-1, and ...The effects of pigment glands and gossypol on the somatic cell culture of upland cotton were studied, using the materials as follows: three pairs of glanded and gland less upland cotton near isogenic lines, TM-1, and Coker 312. The results showed that the pigment glands and gossypol contents in the explants had great inhibiting effect on the induction and growth of callus in somatic cell culture of upland cotton, and the induction rate of callus and the single callus weight of glandless cotton were much higher than those of their glanded near isogenic lines. It was easier to obtain regeneration plants from glandless cotton than from their glandednear isogenic lines. There was a significant inverse correlation between the gossypol contents in the explants and callus induction rate, with the correlation coefficient of -0.84. The vitro gossypol in the medium had some inhibiting effect on the induction and growth of callus, especially for the gland-less cotton. However, a certain concentration of vitro展开更多
文摘T<span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">his paper aims to analyze the competitive position of Port of Douala in Central African ports market structure. In other words, it consists of measuring port market level and competitiveness through an assessment of their growth rate and market share. </span></span></span><span><span><span style="font-family:""><span style="font-family:Verdana;">The purpose of the paper is to </span><span style="font-family:Verdana;">provide us with information on periodical changing status of ports competing with each other. It also provides us with an effective managerial tool to port operators in the assessment of ports market share and position. </span></span></span></span><span style="font-family:Verdana;"><span style="font-family:Verdana;"><span style="font-family:Verdana;">For doing so, the measurement technique as Shift-Share Analysis was applied in the study by using a panel dataset of the 7 selected ports of Central Africa sub-region from 2008 to 2018. The paper used the recent dynamics and characteristics of port market in terms of port throughputs to compare the yearly trend and market share. By conducting the study of the market growth rate model, the findings showed that the Port of Douala was the top leader of the market in 2009, 2015, 2016 and 2018. The findings also revealed the competitive positions of these ports under study have changed over the period of study due to the significant change of their market share with average growth rates. The final results showed that several determinant factors have affected the present hierarchy of competitiveness level in the selected ports market especially with small and medium size ports that are strengthening their positions vis-a-vis larger ones. However, the results could be used for analyzing the relative efficiency and overall performance of the Central African Sub-regional seaports including the Cameroonian ports.</span></span></span>
基金This work was supported by the National Natural Science Foundation of China (Grant Nos. 39970467 and 39830240) Zhejiang Provincial Natural Science Foundation (Grant No. 398260).
文摘The effects of pigment glands and gossypol on the somatic cell culture of upland cotton were studied, using the materials as follows: three pairs of glanded and gland less upland cotton near isogenic lines, TM-1, and Coker 312. The results showed that the pigment glands and gossypol contents in the explants had great inhibiting effect on the induction and growth of callus in somatic cell culture of upland cotton, and the induction rate of callus and the single callus weight of glandless cotton were much higher than those of their glanded near isogenic lines. It was easier to obtain regeneration plants from glandless cotton than from their glandednear isogenic lines. There was a significant inverse correlation between the gossypol contents in the explants and callus induction rate, with the correlation coefficient of -0.84. The vitro gossypol in the medium had some inhibiting effect on the induction and growth of callus, especially for the gland-less cotton. However, a certain concentration of vitro
