人脐血T/NK细胞KIR分子表达的初步探讨

【目的】探讨脐血中T淋巴细胞和自然杀伤 (NK)细胞上杀伤性抑制性受体 (KIR)的表达特性。【方法】采用流式细胞仪检测 2 6份正常分娩新生儿脐血的T/NK细胞表面KIR分子表达 (CD15 8a,CD15 8b和CD94) ,并与正常外周血比较。【结果】脐血中T淋巴细胞和NK细胞均存在KIR分子表达 ;脐血和外周血中T淋巴细胞CD15 8分子表达低于NK细胞 (P<0 0 5 ) ,脐血T淋巴细胞亚群中CD15 8分子表达低于正常外周血 ;CD15 8几乎不表达于CD4 T细胞 ,主要表达于CD8 T细胞 ,且以CD15 8a 为主 ;脐血中NK细胞CD15 8分子表达高于T淋巴细胞 (P <0 0 5 ) ,但明显低于外周血NK细胞KIR表达 (P <0 0 1) ;脐血和外周血CD4 T细胞上CD94 表达无差异 (P >0 0 5 ) ,但脐血CD8 T细胞和NK细胞CD94 表达则明显低于外周血 (P <0 0 1)。【结论】脐血中T淋巴细胞和NK细胞上KIR表达与正常外周血存在明显差异     

游轮上蟑螂侵害情况调查及防治

本文对无锡至杭州的7艘游轮蟑螂侵害情况进行了调查,并观察了使用高效氯氰菊酯超低容量喷雾灭蟑后蟑螂密度的变化。结果表明:游轮蟑螂侵害较严重,侵害率达87.90％,优势蟑种为德国小蠊,占61.70％。喷药前蟑螂密度为1.68只/盒夜,喷药后密度下降为0;喷药三个月后密度为0.28只/盒夜,与喷药前相比差异显著(t=3.160,p<0.05);喷药半年后密度为0.59只/盒夜,与喷药前相比无显著差异(t=2.180,0.05相似文献   

连锁杀蟑毒饵的"连锁药效"试验

目的：建立蜚蠊毒饵连锁药效测试方法，证实威灭连锁杀蟑毒饵的“连锁药效”。方法：投饵法。结果：试虫取食该毒饵后，其主剂仅少量分解，并能以原形经粪便排出或残留于虫尸，致使取食粪便、虫尸的成、若虫再次中毒，形成连锁杀灭作用；若虫二次中毒的３天死亡率为８９．３７％，至第６天达１００％。结论：该毒饵连锁杀蟑效果较为理想；本文设计的新的连锁药效测试方法已通过专家评审，并被国家农药登记注册机构认可。     

Susceptibility of oral bacteria to Melaleuca alternifolia (tea tree) oil in vitro

The in vitro activity of Melaleuca alternifolia (tea tree) oil against 161 isolates of oral bacteria from 15 genera was determined. Minimum inhibitory concentrations (MIC) and minimum bactericidal concentrations (MBC) ranged from 0.003 to 2.0% (v/v). MIC90 values were 1.0% (v/v) for Actinomyces spp., Lactobacillus spp., Streptococcus mitis and Streptococcus sanguis, and 0.1% (v/v) for Prevotella spp. Isolates of Porphyromonas, Prevotella and Veillonella had the lowest MICs and MBCs, and isolates of Streptococcus, Fusobacterium and Lactobacillus had the highest. Time kill studies with Streptococcus mutans and Lactobacillus rhamnosus showed that treatment with > or = 0.5% tea tree oil caused decreases in viability of >3 log colony forming units/ml after only 30 s, and viable organisms were not detected after 5 min. These studies indicate that a range of oral bacteria are susceptible to tea tree oil, suggesting that tea tree oil may be of use in oral healthcare products and in the maintenance of oral hygiene.     

阻塞性黄疸患者外周血T细胞亚群和NK细胞的变化

对34例阻塞性黄疽(下称阻黄)患者外周血淋巴细胞亚群、NK细胞和白细胞介素-2受体阳性细胞进行检测。结果发现,阻黄患者Leu4(总T细胞)和Leu 3a(T辅助细胞)细胞百分比明显降低(P<0.01),Leu 3a/Leu 2a(T抑制细胞)比值下降(P<0.01),NK细胞和白细胞介素-2受体阳性细胞百分比亦明显低下(P<0.01)。上述结果表明,阻黄患者存在着细胞介导的免疫功能异常,而这种异常可能与其诊治过程中感染易感性高有关。     

人早期胚胎活性因子抗肿瘤作用初步研究

用制备人早期胚胎活性因子（简称ＲＰ因子）进行抗肿瘤作用的实验研究，结果体外传代细胞培养ＲＰ因子对Ｈｅｐ－２，Ｈｅｌａ细胞有显著性抑杀作用，对正常２ＢＳ细胞无抑杀作用，可诱导ＬＡＫ细胞，激活ＮＫ细胞，对Ｙａｃ－１瘤细胞，Ｒａｊｉ淋巴瘤细胞，腹水瘤Ｓ１８０细胞的杀伤效果与ＩＬ－２相关似；可显著抑制小鼠肝癌实体瘤的增长，抑瘤率〉３０％以上，显示ＲＰ因子抗肿瘤和增强机免疫功能的作用。     

Evaluation of (E)-2'-deoxy-2'-(fluoromethylene)cytidine on the 9L rat brain tumor model using MRI

(E)-2'-deoxy-2'-(fluoromethylene)cytidine (FMdC), was evaluated as a potential treatment for malignant gliomas using the rat 9L brain tumor model. FMdC was shown to be an effective inhibitor of cell proliferation in cultured 9L cells with an EC(50) of 40 ng/ml. In vitro studies also revealed that this compound significantly inhibited incorporation of [(3)H]thymidine in 9L cells. In vivo therapeutic efficacy of FMdC was evaluated in rats harboring intracerebral 9L tumors which were treated daily with 15 mg/kg, i.p. Treatment response was quantified from changes in tumor growth rates as assessed from sequential magnetic resonance imaging (MRI) tumor volume measurements. In vivo tumor cell kill in individual animals was calculated by fitting tumor volume data with an iterative computer routine. It was estimated that therapeutically responsive rats treated with FMdC daily produced a >/= 0.1 log kill per therapeutic dose which resulted in a significant reduction in tumor growth rate. In addition, localized (1)H-MRS of intracerebral 9L tumors revealed changes in metabolite levels which correlated with therapeutic response. These results provide evidence supporting the use of FMdC in clinical trials for the treatment of malignant gliomas and reveals that MR can play an important role in the pre-clinical evaluation of novel compounds using orthotopic tumor models.     

帕金森病患者T淋巴细胞亚群及NK细胞的临床研究

目的研究帕金森病(PD)患者的T淋巴细胞亚群及NK细胞亚群变化,并探讨其临床意义。方法应用流式细胞仪直接免疫荧光染色法测定25例PD患者外周血T淋巴细胞亚群及NK细胞亚群,并与健康人组进行对照,同时对不同病期、不同伴随症状及L多巴治疗前后的患者进行相关分析。结果PD组CD3+、CD4+、CD8+、CD4+/CD8+水平较对照组降低,NK水平较对照组升高(P<0.05);病情重者CD3+、CD4+、CD4+/CD8+水平显著降低,NK水平升高(P<0.01);伴有抑郁和痴呆的患者CD3+、CD4+、CD4+/CD8+水平较非抑郁和痴呆患者下降(P<0.05);L多巴治疗前后T淋巴细胞亚群及NK细胞亚群水平无明显差异。结论PD存在T细胞免疫功能低下及NK细胞免疫平衡失调,病情重,伴有抑郁和痴呆的患者T细胞免疫功能更低。这对于进一步研究PD的病理生理机制及开辟新的防治途径有一定意义。     

土鳖虫提取物体外抗凝血活性研究

目的：比较土鳖虫不同提取物对人血浆的抗凝血活性,探讨其抗凝血机制。方法：测定土鳖虫提取物不同萃取部位对凝血酶原时间（PT）,凝斑酶时间（TT）,活化的部分凝血活酶时间（APTT）,纤维蛋白原凝固时间（FCT）的影响。结果：土鳖虫的乙酸乙酯部位显著地延长人门,APTT,下下和FCT;石油醚部位、正丁醇部位也有抗凝活性,作用较弱。结论：土鳖虫乙酸乙酯提取部分抗凝作用最强,能直接抑制凝血酶催化的纤维蛋白原凝固。