生物半衰期

然而，NO生物半衰期短（15～30s）、易产生耐受性、副作用明显且使用不便等而使其临床应用受限。

However , the short biological half-life , the quick forming toleration , and the obviously side effect and unsuitable utilization make the clinical application of NO limited .

肝癌肝移植术后血清AFP生物半衰期对肿瘤复发的预测价值早发型重度子痫前期与血浆同型半胱氨酸浓度相关性及相应治疗

The Prognostic Value of Serum Alpha Fetoprotein s Biological Half-life in Tumor Recurrence after Liver Transplantation for Hepatocellular Carcinoma ; Levels of plasma total homocysteine in the patients with early severe on-set pre-eclampsia and the study of interventional therapy

重组水蛭素在家兔体内生物半衰期的测定

Determination of the biological half-life of recombinant hirudin in rabbits

核退役过程中尿氚的测量和氚生物半衰期的研究

Measurement of Tritium in Urine and Study on Half-time of Tritium Excretion of Man

但由于其水溶性差，吸收率低，体内生物半衰期短，目前有关制剂的临床抗癌疗效尚不理想。

Because of its poor solubility in water and short biological half-life in vivo , the current anti-cancer agent is not ideal .

中期观测了5名氚生物半衰期，其范围为7.6～9.4d，平均值为8.5d。

The half-time of tritium excretion of 5 workers are 7.6 ~ 9.4 d and the average value is 8.5 d in middle time .

药物动力学研究表明，该药生物半衰期比较短，普通制剂服用后血药浓度波动大。

The results of pharmacokinetic study show its half life period is short , resulting to fluctuation of blood drug level after administrating conventional dosage form .

采用标准测试方法测定了20种化合物在自然江水（松花江）中的生化需氧量（BOD）随时间的变化，得到了生物降解半衰期。

The halflife periods of biodegradation of 20 organic pollutants in the Songhuajiang River were obtained through determination of the variation of the biochemical oxygen demand ( BOD ) with time with the standard test method .

结果表明，重质油生物降解的半衰期长，经过90d，生物降解量仅占总量的20%。

The results show that the half-life of the heavy-oils is long , and that only 20 % of the hydrocarbons has been biodegraded within 90 days .

镉是一种有害的金属，不易经生物降解，半衰期长，对人体可造成多器官、多系统的损伤。

Cadmium ( Cd ) is a hazardous metal with a long half-life and could affect multiple systems and organs in human .

汞及其化合物（特别是烷基汞）具有很强的生物毒性、较快的生物富集放大速率和较长的脑器官生物半衰期。

Mercury and its compounds ( especially alkyl mercury ) have very strong biological toxicity . And the rate of biological enrichment and amplification were higher than other heavy metals . Meanwhile , their biological half-lifes in brain organ were also much longer .