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21.
在日常学习生活中,学生易形成与科学概念大相径庭的相异构想,严重干扰学生的学习。本文以“人口分布”一节为例,理清教学逻辑,挖掘地理思想,在教学目标中落实地理思想,在教学活动中渗透地理思想,优化地理教学设计,帮助学生矫正相异构想。 相似文献
22.
Chemical characterization and composition of dissolved organic matter in Jiaozhou Bay 总被引：1，自引：0，他引：1
Biologically utilizable dissolved organic compounds, including dissolved organic carbon (DOC), dissolved carbohydrates (DCHO)
and dissolved free amino acids (DFAA) were analyzed in filtered surface seawater samples collected at 19 stations in Jiaozhou
Bay, China, on June 3, 2007. In these samples, concentrations of DOC, dissolved free carbohydrates (DFCHO), dissolved combined
carbohydrates (DCCHO), total dissolved carbohydrates (TDCHO) and total dissolved free amino acids (TDFAA) ranged from 141.7
to 191.1 μmol C/L, 1.98 to 18.18 μmol C/L, 5.04 to 24.90 μmol C/L, 14.52 to 30.36 μmol C/L, and 1.83 to 11.89 μmol C/L, respectively.
As a major component of the dissolved carbohydrates, the concentrations of DCCHO were about three times higher than those
of DFCHO. Three major constituents of the DFAA were threonine (23.0±5.7 mol%), glutamic acid (16.6±3.2 mol%) and arginine
(9.1±3.3 mol%). Based on the composition of DFAA, a molar C:N ratio of 3.60±0.75 in DFAA was derived, indicating longer carbon
chains in the amino acids. DCCHO (8.1%) was the most abundant fraction of DOM in most samples, followed by DFCHO (4.8%) and
TDFAA (2.7%). These DOM concentrations displayed a decreasing trend from the coast to the central region. Significant correlations
were found between the DCCHO and DFCHO concentrations (r=-0.724, n=19, P<0.001) and the DCCHO and TDCHO concentrations (r=0.506, n=19, P=0.027). 相似文献