Compared to modern counterparts,studies have been done on the wood changes of chemical components and structure of the waterlogged uncovered from Changtaiguan Tomb No.7.Some suggestions on preservation of ancient wate...Compared to modern counterparts,studies have been done on the wood changes of chemical components and structure of the waterlogged uncovered from Changtaiguan Tomb No.7.Some suggestions on preservation of ancient waterlogged wood have been provided.The results indicate that the waterlogged coffin wood from Changtaiguan may be eroded heavily.Compared with modern fresh wood,contents of hot water extractives and organic extractives in ancient wood have decreased,and contents of holocellulose and pentosan have declined sharply,while contents of lignin and ash have relatively increased.Sulfur content in the ancient wood is approximately the same as the modern fresh one and iron content in the ancient wood is much richer than the modern fresh one.Treatments using PEG or and sugars are unsuitable for the waterlogged coffin wood uncovered from No.7 Ancient Tomb in Changtaiguan.展开更多
This paper deals with the chemical composition of three kinds of rattan canes species, i.e., Calamus tetradactylus, C. simplicifolius and Daemonorops margaritae. The preliminary results were as follows: 1) The holocel...This paper deals with the chemical composition of three kinds of rattan canes species, i.e., Calamus tetradactylus, C. simplicifolius and Daemonorops margaritae. The preliminary results were as follows: 1) The holocellulose, pentosan and lignin were major chemical composition for the rattans, and its contents in the C. simplicifolius was the highest and that in D. margaritae was the lowest. The extractives of benzen-alcohol, hot water, cold water and 1%NaOH were minor chemical composition for the rattans, and its contents in the D. margaritae were the highest and that in the C. simplicifolius were the lowest. 2) There were some differences in content of the chemical composition among the root, middle and top of canes. For C. tetradactylus cane the holocellulose in root and the lignin in top were the highest and there were a little difference in pentosan content among the root, middle and top of the canes, and the holocellulose, pentosan and lignin in top were higher than that in root for C. simplicifolius and D. margaritae. 3) The extractives had been shown a difference in contents in different places of canes. For D. margaritae the extractives of the canes in top was higher than that in other places, and that of C. tetradactylus and C. simplicifolius had been shown a ruleless. 4) The major monosaccharide of the three kinds of rattan were glucose and xylose and shown a higher contents of 42%～46% and 20%～24%, respectively. It showed that the rattans were similar to hardwood.展开更多
文摘Compared to modern counterparts,studies have been done on the wood changes of chemical components and structure of the waterlogged uncovered from Changtaiguan Tomb No.7.Some suggestions on preservation of ancient waterlogged wood have been provided.The results indicate that the waterlogged coffin wood from Changtaiguan may be eroded heavily.Compared with modern fresh wood,contents of hot water extractives and organic extractives in ancient wood have decreased,and contents of holocellulose and pentosan have declined sharply,while contents of lignin and ash have relatively increased.Sulfur content in the ancient wood is approximately the same as the modern fresh one and iron content in the ancient wood is much richer than the modern fresh one.Treatments using PEG or and sugars are unsuitable for the waterlogged coffin wood uncovered from No.7 Ancient Tomb in Changtaiguan.
文摘This paper deals with the chemical composition of three kinds of rattan canes species, i.e., Calamus tetradactylus, C. simplicifolius and Daemonorops margaritae. The preliminary results were as follows: 1) The holocellulose, pentosan and lignin were major chemical composition for the rattans, and its contents in the C. simplicifolius was the highest and that in D. margaritae was the lowest. The extractives of benzen-alcohol, hot water, cold water and 1%NaOH were minor chemical composition for the rattans, and its contents in the D. margaritae were the highest and that in the C. simplicifolius were the lowest. 2) There were some differences in content of the chemical composition among the root, middle and top of canes. For C. tetradactylus cane the holocellulose in root and the lignin in top were the highest and there were a little difference in pentosan content among the root, middle and top of the canes, and the holocellulose, pentosan and lignin in top were higher than that in root for C. simplicifolius and D. margaritae. 3) The extractives had been shown a difference in contents in different places of canes. For D. margaritae the extractives of the canes in top was higher than that in other places, and that of C. tetradactylus and C. simplicifolius had been shown a ruleless. 4) The major monosaccharide of the three kinds of rattan were glucose and xylose and shown a higher contents of 42%～46% and 20%～24%, respectively. It showed that the rattans were similar to hardwood.
