The adsorption properties of nanometer-size TiO2 for V（Ⅴ ） were studied. The adsorption rate could reach above 99~ when the pH values were at the range of 4 10. The adsorption balance time was 10 min , the saturati...The adsorption properties of nanometer-size TiO2 for V（Ⅴ ） were studied. The adsorption rate could reach above 99~ when the pH values were at the range of 4 10. The adsorption balance time was 10 min , the saturation capacity of adsorption of nanometer-size TiO2 to V（Ⅴ） was 6.43 mg per gram. Using 2 mL 1.5 mol · L^-1 NaOH as elution, we found the elution rate could reach 95%. A novel method of extreme-trace V（Ⅴ ） preconeentration with nanometer-size titanium dioxide and determination by graphite furnace atomic absorption spectroscopy （GFAAS） was advanced. The detection limit（3σ）of the method was 0.61μg ·L^-1 , and the relative standard deviation was 8.1% （n=6） of 2.5μg ·L-^1 V（Ⅴ）. Environmental samples experiments were also conducted to test the feasibility of the method, and it came out that the recovery rates were between 91.2% and 102.0%.展开更多
目的:研究肿瘤诱发的获得性凝血因子Ⅴ缺乏症(acquired factor V deficiency, AFVD)临床表现特点,探讨肿瘤诱发的AFVD的治疗选择。方法:报道1例肿瘤诱发AFVD患者的临床特征、实验室检查指标、诊治经过并进行相关的文献复习及讨论。结果...目的:研究肿瘤诱发的获得性凝血因子Ⅴ缺乏症(acquired factor V deficiency, AFVD)临床表现特点,探讨肿瘤诱发的AFVD的治疗选择。方法:报道1例肿瘤诱发AFVD患者的临床特征、实验室检查指标、诊治经过并进行相关的文献复习及讨论。结果:老年男性,临床表现为黑便,无遗传性凝血因子缺乏病史及家族史。实验室检查提示凝血酶原时间(PT)、活化部分凝血活酶时间(APTT)显著延长,凝血因子V活性(Factor V∶C)降低,Ⅴ因子抑制物水平升高。PET/CT:结肠及回肠末段代谢增高,提示肿瘤性疾病。对症输注新鲜冰冻血浆(FFP)后疗效欠佳。应用糖皮质激素治疗后出现血压明显升高,继而出现急性硬膜下出血,紧急给予Ⅶ因子抢救,最终放弃治疗出院,院外患者死亡。结论:获得性凝血因子Ⅴ抑制物所致的凝血障碍是一种少见疾病,预后与患者基础疾病相关。对于老年患者需注意除外肿瘤性疾病继发的AFVD以及糖皮质激素治疗的副作用。展开更多
文摘The adsorption properties of nanometer-size TiO2 for V（Ⅴ ） were studied. The adsorption rate could reach above 99~ when the pH values were at the range of 4 10. The adsorption balance time was 10 min , the saturation capacity of adsorption of nanometer-size TiO2 to V（Ⅴ） was 6.43 mg per gram. Using 2 mL 1.5 mol · L^-1 NaOH as elution, we found the elution rate could reach 95%. A novel method of extreme-trace V（Ⅴ ） preconeentration with nanometer-size titanium dioxide and determination by graphite furnace atomic absorption spectroscopy （GFAAS） was advanced. The detection limit（3σ）of the method was 0.61μg ·L^-1 , and the relative standard deviation was 8.1% （n=6） of 2.5μg ·L-^1 V（Ⅴ）. Environmental samples experiments were also conducted to test the feasibility of the method, and it came out that the recovery rates were between 91.2% and 102.0%.
