研究32%滴酸·草甘膦水剂对芒果园杂草的药效,结果表明:32%滴酸·草甘膦水剂对芒果园中一年生及多年生杂草有较好的防除作用,在杂草生长旺盛期使用剂量2 250 m L/hm2,药后30 d,综合防效可达98%以上,可有效控制芒果园中各种杂草...研究32%滴酸·草甘膦水剂对芒果园杂草的药效,结果表明:32%滴酸·草甘膦水剂对芒果园中一年生及多年生杂草有较好的防除作用,在杂草生长旺盛期使用剂量2 250 m L/hm2,药后30 d,综合防效可达98%以上,可有效控制芒果园中各种杂草生长的危害。展开更多
The acid perfusion test (APT) is a test of esophageal acid sensitivity. In gastroesophageal reflux disease (GERD), the APT has largely been superseded by indexes derived from 24- hr esophageal pH monitoring: symptom i...The acid perfusion test (APT) is a test of esophageal acid sensitivity. In gastroesophageal reflux disease (GERD), the APT has largely been superseded by indexes derived from 24- hr esophageal pH monitoring: symptom index (SI), symptom sensitivity index (SSI), and symptom association probability (SAP). To evaluate the role of APT in patients with GERD we compared values of SI, SSI, and SAP in 126 APT+ and 146 APT- patients. Median values for SI, SSI, and SAP were higher in the APT+ compared with the APT- group (P < 0.001). More patients had a positive SI, SSI, and SAP in the APT+ compared with the APT- group (SI, P < 0.0001; SSI and SAP, P < 0.001). Patients with a negative APT were unlikely to have symptoms caused by acid reflux (negative predictive value, 86% ). APT may be useful in detecting acid sensitivity in patients who do not report symptoms on 24- hr esophageal pH monitoring.展开更多
The kinetics of forward extraction of boric acid from salt lake brine by 2-ethyl-1,3-hexanediol in toluene was investigated using the single drop technique. The factors affecting the extraction rate include interfacia...The kinetics of forward extraction of boric acid from salt lake brine by 2-ethyl-1,3-hexanediol in toluene was investigated using the single drop technique. The factors affecting the extraction rate include interfacial area between aqueous phase and organic phase, initial concentration of boric acid in aqueous phase, initial concentration of 2-ethyl-1,3-hexanediol in organic phase, and extraction temperature. The experimental results show that the extraction rate increases with the increase of the initial concentration of boric acid and2-ethyl-1,3-hexanediol, interfacial area of two phases, and temperature. With the temperature-dependence study, it is showed that the extraction is a diffusion-controlled process. The kinetic equation is presented for pH 1.0 in the aqueous phase and temperature of 318 K.展开更多
文摘The acid perfusion test (APT) is a test of esophageal acid sensitivity. In gastroesophageal reflux disease (GERD), the APT has largely been superseded by indexes derived from 24- hr esophageal pH monitoring: symptom index (SI), symptom sensitivity index (SSI), and symptom association probability (SAP). To evaluate the role of APT in patients with GERD we compared values of SI, SSI, and SAP in 126 APT+ and 146 APT- patients. Median values for SI, SSI, and SAP were higher in the APT+ compared with the APT- group (P < 0.001). More patients had a positive SI, SSI, and SAP in the APT+ compared with the APT- group (SI, P < 0.0001; SSI and SAP, P < 0.001). Patients with a negative APT were unlikely to have symptoms caused by acid reflux (negative predictive value, 86% ). APT may be useful in detecting acid sensitivity in patients who do not report symptoms on 24- hr esophageal pH monitoring.
基金Supported by the Natural Science Foundation of the Education Department Hebei Province(2009426)Educational Commission of Hebei Province(ZH2011221)
文摘The kinetics of forward extraction of boric acid from salt lake brine by 2-ethyl-1,3-hexanediol in toluene was investigated using the single drop technique. The factors affecting the extraction rate include interfacial area between aqueous phase and organic phase, initial concentration of boric acid in aqueous phase, initial concentration of 2-ethyl-1,3-hexanediol in organic phase, and extraction temperature. The experimental results show that the extraction rate increases with the increase of the initial concentration of boric acid and2-ethyl-1,3-hexanediol, interfacial area of two phases, and temperature. With the temperature-dependence study, it is showed that the extraction is a diffusion-controlled process. The kinetic equation is presented for pH 1.0 in the aqueous phase and temperature of 318 K.
