Low pressure MOCVD has been used to investigate the properties of low temperature buffer layer deposition conditions and their influence on the properties of high temperature GaN epilayers grown subsequently. It is fo...Low pressure MOCVD has been used to investigate the properties of low temperature buffer layer deposition conditions and their influence on the properties of high temperature GaN epilayers grown subsequently. It is found that the surface morphology of the as grown buffer layer after thermal annealing at 1 030 ℃ and 1 050 ℃ depends strongly on the thickness of the buffer layer. In particular when a thick buffer layer is used, large trapezoidal nuclei are formed after annealing.展开更多
AIM:To assess the symptomatic efficacy of Lactobacillus plantarum 299v(L.plantarum 299v)(DSM 9843) for the relief of abdominal symptoms in a large subset of irritable bowel syndrome(IBS) patients fulfilling the Rome ...AIM:To assess the symptomatic efficacy of Lactobacillus plantarum 299v(L.plantarum 299v)(DSM 9843) for the relief of abdominal symptoms in a large subset of irritable bowel syndrome(IBS) patients fulfilling the Rome Ⅲ criteria.METHODS:In this double blind,placebo-controlled,parallel-designed study,subjects were randomized to daily receive either one capsule of L.plantarum 299v(DSM 9843) or placebo for 4 wk.Frequency and intensity of abdominal pain,bloating and feeling of incomplete rectal emptying were assessed weekly on a visual analogue scale while stool frequency was calculated.RESULTS:Two hundred and fourteen IBS patients were recruited.After 4 wk,both pain severity(0.68 + 0.53 vs 0.92 + 0.57,P < 0.05) and daily frequency(1.01 + 0.77 vs 1.71 + 0.93,P < 0.05) were lower with L.plantarum 299v(DSM 9843) than with placebo.Similar results were obtained for bloating.At week 4,78.1 % of the patients scored the L.plantarum 299v(DSM 9843) symptomatic effect as excellent or good vs only 8.1 % for placebo(P < 0.01).CONCLUSION:A 4-wk treatment with L.plantarum 299v(DSM 9843) provided effective symptom relief,particularly of abdominal pain and bloating,in IBS patients fulfilling the Rome Ⅲ criteria.展开更多
Tectonic movements in the North Slope of Biyang Depression are comparatively mild and stable, thus generating two categories of deltas. Elementary reasons for the coexistence of deltas are the existence of the palaeod...Tectonic movements in the North Slope of Biyang Depression are comparatively mild and stable, thus generating two categories of deltas. Elementary reasons for the coexistence of deltas are the existence of the palaeodrainage pattern and the effect of palaeotopography. The sedimentary facies is the most elementary factor controlling the physical property of reservoirs. The layout and spatial combination model of the sand body and faults are the major influential factors on the occurrence of hydrocarbons. Comparative study on Houzhang and Yanglou Braided Deltas as well as Zhangchang and Gucheng Meandering Deltas suggests that the hydrocarbons distribute primarily in the mouth bar subfacies and secondarily in the distal bar subfacies of the braided delta, while the oil-water and aqueous layers are mainly found in the subaquatic distributary channel. Although the sand body of the meandering delta has excellent stratification and high porosity, the thickness is far less than that of the braided delta. Therefore, the yield of hydrocarbon is relatively low. The mudstone of the delta front subfacies is a kind of source rock with a high content of organic matter. The conducting system for oil/gas migration in the North Slope is a composite one comprising faults and sand- stone reservoirs. A large amount of oil/gas from the deep depression first migrated towards the slope along the sand body which stretches and connects with the source rocks, and then redistributed along the faults in the slope. After the movement reached a standstill, the faults formed the occlusion in the up-dip direction of the sand body, generating a great quantity of fault block hydrocarbon reservoirs in the Noah Slope.展开更多
文摘Low pressure MOCVD has been used to investigate the properties of low temperature buffer layer deposition conditions and their influence on the properties of high temperature GaN epilayers grown subsequently. It is found that the surface morphology of the as grown buffer layer after thermal annealing at 1 030 ℃ and 1 050 ℃ depends strongly on the thickness of the buffer layer. In particular when a thick buffer layer is used, large trapezoidal nuclei are formed after annealing.
基金Supported by Rosell-Lallemand Institute,France and Probi AB,Sweden
文摘AIM:To assess the symptomatic efficacy of Lactobacillus plantarum 299v(L.plantarum 299v)(DSM 9843) for the relief of abdominal symptoms in a large subset of irritable bowel syndrome(IBS) patients fulfilling the Rome Ⅲ criteria.METHODS:In this double blind,placebo-controlled,parallel-designed study,subjects were randomized to daily receive either one capsule of L.plantarum 299v(DSM 9843) or placebo for 4 wk.Frequency and intensity of abdominal pain,bloating and feeling of incomplete rectal emptying were assessed weekly on a visual analogue scale while stool frequency was calculated.RESULTS:Two hundred and fourteen IBS patients were recruited.After 4 wk,both pain severity(0.68 + 0.53 vs 0.92 + 0.57,P < 0.05) and daily frequency(1.01 + 0.77 vs 1.71 + 0.93,P < 0.05) were lower with L.plantarum 299v(DSM 9843) than with placebo.Similar results were obtained for bloating.At week 4,78.1 % of the patients scored the L.plantarum 299v(DSM 9843) symptomatic effect as excellent or good vs only 8.1 % for placebo(P < 0.01).CONCLUSION:A 4-wk treatment with L.plantarum 299v(DSM 9843) provided effective symptom relief,particularly of abdominal pain and bloating,in IBS patients fulfilling the Rome Ⅲ criteria.
文摘Tectonic movements in the North Slope of Biyang Depression are comparatively mild and stable, thus generating two categories of deltas. Elementary reasons for the coexistence of deltas are the existence of the palaeodrainage pattern and the effect of palaeotopography. The sedimentary facies is the most elementary factor controlling the physical property of reservoirs. The layout and spatial combination model of the sand body and faults are the major influential factors on the occurrence of hydrocarbons. Comparative study on Houzhang and Yanglou Braided Deltas as well as Zhangchang and Gucheng Meandering Deltas suggests that the hydrocarbons distribute primarily in the mouth bar subfacies and secondarily in the distal bar subfacies of the braided delta, while the oil-water and aqueous layers are mainly found in the subaquatic distributary channel. Although the sand body of the meandering delta has excellent stratification and high porosity, the thickness is far less than that of the braided delta. Therefore, the yield of hydrocarbon is relatively low. The mudstone of the delta front subfacies is a kind of source rock with a high content of organic matter. The conducting system for oil/gas migration in the North Slope is a composite one comprising faults and sand- stone reservoirs. A large amount of oil/gas from the deep depression first migrated towards the slope along the sand body which stretches and connects with the source rocks, and then redistributed along the faults in the slope. After the movement reached a standstill, the faults formed the occlusion in the up-dip direction of the sand body, generating a great quantity of fault block hydrocarbon reservoirs in the Noah Slope.
