查询词典 dose rate

In this study, for the complicated distribution of dose rate in time and space, considering the repair of the sub-death cells, the radionuclide decay law and exponential proliferation of clonogenic cells, the dose-response relationship is built based on the known linear-quadratic model, and the concept of tumor control probability is introduced into the therapy method. Furthermore, the concepts about "curable stage" and "critical time point" and the methods calculating the amount of radionuclide injected into tumor in clinical are proposed.

本课题针对这一方法中靶区复杂的剂量率时-空分布特点，以公认的"线性-二次模型"理论为基础，同时考虑亚致死性细胞修复、核素衰变规律和克隆原性细胞指数增殖，建立了适合这一治疗方法的具有时-空分布特点的剂量效应关系，并进一步将肿瘤控制概率的概念引入这一方法中，提出了"治愈期"及"临界时间点"的概念以及由此指导临床确定药物注射剂量的方法。

Illustrative results are presented for the radiation dose and dose profile with activity distributions: uniform, determined by steady-state diffusion into the target volume, or determined by steady-state diffusion with a constant rate of loss of activity from the target.

计算程序用Visual Basic V6.0编写，在微机上运行。为了验证计算结果，将均匀分布条件下的计算结果分别与文献报导的结果比较，发现它们是一致的。

The effects of monomer concentration, radiation dose and dose rate on graft yield were discussed.

研究了辐射接枝反应中单体转化率、接枝率的变化规律。

Dose will be determined by the dose rate and irradiation time of the sample.

文中就确定吸收剂量的两种方法的可靠性进行了探讨，并利用两种类型的丙氨酸剂量计通过伴随法测定了被测样品的吸收剂量。

And the content of the free radical was affected by the dose and dose rate and declined with the prolong of time.

电子束辐照产生的极性含氧基团和自由基为UHMWPE纤维的表面接枝改性奠定了基础。

The dose-response curve of histamine was shifted parallely to the right. pA2 was 9.34±0.61. The guinea-pigs were effectively reduced the rate of histamine induced death, decreased reaction extent of shock (P＜0.01) and prolonged latency period of shock (P＜0.05) by orally administered cetirizine ranged from 0.1, 0.2 and 0.4 mg.kg-1. The capillary permeability to intracutaneous injection of histamine was potently inhibited by orally administered cetirizine ranged from 0.0625 to 0.25 mg.kg-1 in mice, blue area obviously decreased (P＜0.01), and dose-response curve existed obviously. In which the effect of these dosage groups were superior to the group of chlorphenamine.

结果：西替利嗪3×10-8～3×10-7mol.L-1可剂量依赖性地对抗组胺引起的肠肌收缩，使组胺的量效曲线平行右移，pA2为9.34 ± s 0.61，西替利嗪0.1，0.2及0.4 mg.kg-1口服给药时，能明显减轻豚鼠静脉注射组胺所致休克反应的严重程度(P＜0.01)，并可延长豚鼠惊厥反应的潜伏期及降低死亡率(P＜0.05)，西替利嗪0.0625～0.25 mg.kg-1口服给药可显著对抗组胺引起的小鼠皮肤血管通透性的增高，使蓝染面积显著缩小(P＜0.01)，且存在明显的量效关系，3个剂量组的作用均优于氯苯那敏组。

NGF had obvious cytotoxicity on these cell lines ,which shows to be dose-dependent, especially for MGC-803 and BEL-7404 ,their IC_(50) value at the 24~ hours are 49.9mg/L and 55.46mg/L ; Main features of apoptosis under fluorescent microscope include reduction in volume,nuclear chromatin condensation, intensification under jacinth fluorescence; The early apoptosis rate of pristine cells which detected by FCM increases with NGF dose increasing.

2NGF对4种人肿瘤细胞均有细胞毒性作用，且呈剂量依赖关系，尤其是对MGC-803和BEL-7404的抑制作用更强，作用24h的IC50值分别为49.9mg/L和55.46mg/L，荧光显微镜下可观察到MGC-803凋亡细胞的主要特点为：细胞体积缩小，染色质固缩，橘红色荧光增强；流式细胞仪检测到MGC-803细胞的早期凋亡率随NGF浓度的增高而增加，各浓度组与对照组的早期细胞凋亡率比较有明显差异(P＜0.01)。

Objective To observe the dose-rate effects of adaptive response of thymocyte DNA lysis induced by low dose radiation.

目的：观察低剂量辐射诱导胸腺细胞DNA裂解适应性反应的剂量率效应。

The typical apoptotic morphological features appeared in MUTZ-1 cells treated with 4mmol/L VPA for 72hours. Pyknosis of cells and nuclei, disintegration of nuclear chromatin and apoptotic body could be observed by light microscopy. Aggregation and margination of nuclear chromatin, concentration of plasm, increment of density and chromatin mass of irregular size could be observed by transmission electronmicroscope. The flow cytometric analysis indicated that the VPA could induce cell apoptosis, apoptosis rate increased in dose-dependent manner, ratio of cells at G0/G1 phase increased and ratio of cells at S phase decreased in dose-dependent manner, the cells were arrested at G0/G1 phase.

结果显示：VPA对MUTZ-1细胞的生长抑制作用呈现时间和剂量依赖性；经4mmol/LVPA处理MUTZ-1细胞72小时后，细胞呈现典型的凋亡形态特征，光学显微镜下可见凋亡细胞胞体固缩、核固缩、核碎裂及凋亡小体；透射电子显微镜下可见凋亡细胞核染色质边集、胞浆浓缩、密度增加，胞装内大小不规则的染色质团块；流式细胞术结果表明，细胞凋亡率随着VPA浓度的增加而逐步增高，G0/G1期细胞比例随着VPA浓度的增加而逐渐增多，S期细胞比例逐渐减低，细胞被阻滞在G0/G1期。

In 35 milk tooth samples permanent and milk tooth samples weredivided into 5 dose groups each, and irradiated with 60Co γ ray at dose rate of 0.48 Gy/min. Radi-ation doses of 5 groups were 0.30, 0.50, 1.00, 3.00 and 5.00 Gy, respectively.

将恒牙和乳牙各分成4和5个剂量组，用60Co γ射线照射各组样品，剂量率为0.48 Gy／min，各组累积剂量分别为0.30、0.50、1.00、3.00和5.00 Gy。

In contrast to the ubiquitous rising-sun-with-rays military flag of the Japanese, Chinese banners and ensigns feature a range of designs.

与遍地都是的太阳军旗不同，中国人的旗帜和徽章设计得各式各样。

From their small corner of Feng's Guangzhou headquarters -- a jumble of pink leashes, squeezable rubber steaks, and plastic doggy Santas for Fido's stocking -- Soleil's designers come up with at least five new products a month.

从Feng 设在广州总部的产品展示柜台上可以看到，Soleil的设计师每月至少设计出5件新产品。