Acidobacteria is one of the most dominant and abundant phyla in soil,and was believed to have a wide range of metabolic and genetic functions. Relatively little is known about its community structure and elevational d...Acidobacteria is one of the most dominant and abundant phyla in soil,and was believed to have a wide range of metabolic and genetic functions. Relatively little is known about its community structure and elevational diversity patterns. We selected four elevation gradients from 1000 to 2800 m with typical vegetation types of the northern slope of Shennongjia Mountain in central China. The vegetation types were evergreen broadleaved forest,deciduous broadleaved forest,coniferous forest and sub-alpine shrubs. We analyzed the soil acidobacterial community composition,elevational patterns and the relationship between Acidobacteria subdivisions and soil enzyme activities by using the 16 S rRNA meta-sequencing technique and multivariate statistical analysis. The result found that 19 known subdivisions as well as an unclassified phylotype were presented in these forest sites,and Subdivision 6 has the highest number of detectable operational taxonomic units（OTUs）. A significant single peak distribution pattern（P 〈 0.05） between the OTU number and the elevation was observed. The Jaccard and Bray–Curtis index analysis showed that the soil Acidobacteria compositional similarity significantly decreased（P 〈 0.01） with the increase in elevation distance. Mantel test analysis showed the most of the soil Acidobacteria subdivisions had the significant relationship（P 〈 0.01） with different soil enzymes. Therefore,soil Acidobacteria may be involved in different ecosystem functions in global elemental cycles. Partial Mantel tests and CCA analysis showed that soil pH,soil temperature and plant diversity may be the key factors in shaping the soil Acidobacterial community structure.展开更多
Objective To examine the association of maternal dietary patterns during pregnancy with gestationa diabetes mellitus （GDM） in northern China. Methods The dietary intakes of pregnant women were recorded twice by 24-h...Objective To examine the association of maternal dietary patterns during pregnancy with gestationa diabetes mellitus （GDM） in northern China. Methods The dietary intakes of pregnant women were recorded twice by 24-hour dietary recalls for three days prior to having been diagnosed with GDM, at 5-15 and 24-28 gestational weeks, respectively. GDM was diagnosed, and serum glycosylated hemoglobin （HbAlc） was measured at 24-28 weeks. Dietary patterns were assessed by factor analysis. The association of the dietary pattern with GDM and HbAlc was examined by multiple logistic models. Results Of 753 participants, 64 （8.5%） were diagnosed with GDM. Four dietary patterns were identified： Western pattern （dairy, baked/fried food and white meat）, traditional pattern （light-colored vegetables, fine grain, red meat and tubers）, mixed pattern （edible fungi, shrimp/shellfish and red meat） and prudent pattern （dark-colored vegetables and deep-sea fish）. Compared with the prudent pattern, both the Western pattern and the traditional pattern were associated with an increased risk of GDM （aOR = 4.40, 95% CI： 1.58-12.22; aOR = 4.88, 95% Ch 1.79-13.32） and a high level of HbAlc （aOR = 12.37, 95% Ch 1.47-103.91; aOR = 26.23, 95% CI： 2.54-270.74）. Compared to the lowest quartile （Q）, 0.3 of the Western pattern scores and Q3-Q4 of the traditional pattern scores were associated with a higher risk of GDM. Conclusion The consumption of the Western pattern or the traditional pattern during pregnancy may increase the risk of GDM.展开更多
基金supported by the Public Welfare Project of the National Scientific Research Institution (No.CAFRIFEEP201101),Chinathe National Biological Specimens and Resources Sharing Platform in Nature Reserve (No.2005DKA21404)
文摘Acidobacteria is one of the most dominant and abundant phyla in soil,and was believed to have a wide range of metabolic and genetic functions. Relatively little is known about its community structure and elevational diversity patterns. We selected four elevation gradients from 1000 to 2800 m with typical vegetation types of the northern slope of Shennongjia Mountain in central China. The vegetation types were evergreen broadleaved forest,deciduous broadleaved forest,coniferous forest and sub-alpine shrubs. We analyzed the soil acidobacterial community composition,elevational patterns and the relationship between Acidobacteria subdivisions and soil enzyme activities by using the 16 S rRNA meta-sequencing technique and multivariate statistical analysis. The result found that 19 known subdivisions as well as an unclassified phylotype were presented in these forest sites,and Subdivision 6 has the highest number of detectable operational taxonomic units（OTUs）. A significant single peak distribution pattern（P 〈 0.05） between the OTU number and the elevation was observed. The Jaccard and Bray–Curtis index analysis showed that the soil Acidobacteria compositional similarity significantly decreased（P 〈 0.01） with the increase in elevation distance. Mantel test analysis showed the most of the soil Acidobacteria subdivisions had the significant relationship（P 〈 0.01） with different soil enzymes. Therefore,soil Acidobacteria may be involved in different ecosystem functions in global elemental cycles. Partial Mantel tests and CCA analysis showed that soil pH,soil temperature and plant diversity may be the key factors in shaping the soil Acidobacterial community structure.
基金funded by China Medical Board[CMB Grant 13‐131]the Key Discipline Construction of Public Health of Shang hai[No.15GWZK0402]the National Natural Science Foundation of China[Grant No.81273066]
文摘Objective To examine the association of maternal dietary patterns during pregnancy with gestationa diabetes mellitus （GDM） in northern China. Methods The dietary intakes of pregnant women were recorded twice by 24-hour dietary recalls for three days prior to having been diagnosed with GDM, at 5-15 and 24-28 gestational weeks, respectively. GDM was diagnosed, and serum glycosylated hemoglobin （HbAlc） was measured at 24-28 weeks. Dietary patterns were assessed by factor analysis. The association of the dietary pattern with GDM and HbAlc was examined by multiple logistic models. Results Of 753 participants, 64 （8.5%） were diagnosed with GDM. Four dietary patterns were identified： Western pattern （dairy, baked/fried food and white meat）, traditional pattern （light-colored vegetables, fine grain, red meat and tubers）, mixed pattern （edible fungi, shrimp/shellfish and red meat） and prudent pattern （dark-colored vegetables and deep-sea fish）. Compared with the prudent pattern, both the Western pattern and the traditional pattern were associated with an increased risk of GDM （aOR = 4.40, 95% CI： 1.58-12.22; aOR = 4.88, 95% Ch 1.79-13.32） and a high level of HbAlc （aOR = 12.37, 95% Ch 1.47-103.91; aOR = 26.23, 95% CI： 2.54-270.74）. Compared to the lowest quartile （Q）, 0.3 of the Western pattern scores and Q3-Q4 of the traditional pattern scores were associated with a higher risk of GDM. Conclusion The consumption of the Western pattern or the traditional pattern during pregnancy may increase the risk of GDM.
