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991.
本文测试了孔隙率为14%,孔径小于2μm的纯羟基磷灰石(HA)与兔胫骨皮质骨之间界面的抗张强度,2周时为0.72MPa;4、8、16周之间强度无明显差异平均为1.5MPa。扫描电镜观察表明,2周时拉伸断裂位于HA-骨界面,4周以后多在HA晶体颗粒之间。HA与骨生物适应性好,矿化组织可以直接沉着于HA表面或HA内部,近界面处的HA发生了一定的生物降解反应,且骨矿化与HA的降解可能达到某种平衡。 相似文献
992.
993.
人体肠道生物力学特性的研究 总被引:1,自引:0,他引:1
为探讨人体肠道的生物力学特性,采用电子拉伸机对人体肠道进行一维拉伸试验。结果表明,人体肠道应力-应变关系为指数函数关系。人体肠道各段的指数系数a值接近,但材料常数C有一定的差异,说明肠道各段应力-应变趋势是一致的。在一定应力下,肠道各段轴向与环向的相对伸长率是不同的,表明人体肠道具有各向异性的特性。在一定应变下,肠道各段的增量弹性模量不同,结肠增量弹性模量相对较小,因而更容易发生变形。本研究为肠道内窥镜机器人的研制提供了理论基础。 相似文献
994.
Qing Lei Yang Li Hong-yan Hou Feng Wang Zhu-qing Ouyang Yandi Zhang Dan-yun Lai Jo-Lewis Banga Ndzouboukou Zhao-wei Xu Bo Zhang Hong Chen Jun-biao Xue Xiao-song Lin Yun-xiao Zheng Zong-jie Yao Xue-ning Wang Cai-zheng Yu He-wei Jiang Hai-nan Zhang Huan Qi Shu-juan Guo Sheng-hai Huang Zi-yong Sun Sheng-ce Tao Xiong-lin Fan 《Allergy》2021,76(2):551-561
Background
The missing asymptomatic COVID-19 infections have been overlooked because of the imperfect sensitivity of the nucleic acid testing (NAT). Globally understanding the humoral immunity in asymptomatic carriers will provide scientific knowledge for developing serological tests, improving early identification, and implementing more rational control strategies against the pandemic.Measure
Utilizing both NAT and commercial kits for serum IgM and IgG antibodies, we extensively screened 11 766 epidemiologically suspected individuals on enrollment and 63 asymptomatic individuals were detected and recruited. Sixty-three healthy individuals and 51 mild patients without any preexisting conditions were set as controls. Serum IgM and IgG profiles were further probed using a SARS-CoV-2 proteome microarray, and neutralizing antibody was detected by a pseudotyped virus neutralization assay system. The dynamics of antibodies were analyzed with exposure time or symptoms onset.Results
A combination test of NAT and serological testing for IgM antibody discovered 55.5% of the total of 63 asymptomatic infections, which significantly raises the detection sensitivity when compared with the NAT alone (19%). Serum proteome microarray analysis demonstrated that asymptomatics mainly produced IgM and IgG antibodies against S1 and N proteins out of 20 proteins of SARS-CoV-2. Different from strong and persistent N-specific antibodies, S1-specific IgM responses, which evolved in asymptomatic individuals as early as the seventh day after exposure, peaked on days from 17 days to 25 days, and then disappeared in two months, might be used as an early diagnostic biomarker. 11.8% (6/51) mild patients and 38.1% (24/63) asymptomatic individuals did not produce neutralizing antibody. In particular, neutralizing antibody in asymptomatics gradually vanished in two months.Conclusion
Our findings might have important implications for the definition of asymptomatic COVID-19 infections, diagnosis, serological survey, public health, and immunization strategies.995.
非小细胞肺癌中p16 INK4/CDKN2基因的缺失和点突变 总被引:5,自引:0,他引:5
目的为了探讨周期素依赖性激酶4抑制因子基因(p16INK4)与肺癌发生的关系。方法采用双重PCR-SSCP和序列分析方法,对31例原发性非小细胞肺癌中p16INK4基因的存在状况进行了研究。结果3例存在p16基因缺失(3/31),其中1例整个p16基因发生缺失,另两例则分别为外显子1和外显子2缺失;p16基因点突变2例(2/31),外显子1和外显子2各一例;并发现在这五例基因异常样品中,4例(2例缺失和2例点突变)样品均为淋巴转移的非小细胞肺癌(4/20)。结论提示p16基因失活和某些非小细胞肺癌(5/31)的发生有关,并且可能发生在癌症的晚期。 相似文献
996.
Yuan B. Peng Qing Lin W. D. Willis 《Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale》1997,114(3):561-570
The effects of a protein kinase C (PKC) activator, 12-O-tetradecanoylphorbol-13-acetate (TPA), on the activity and periaqueductal gray (PAG)-induced inhibition of rat dorsal horn
neurons of the lumbar spinal cord were tested. A microdialysis fiber was placed through the dorsal horn for the purpose of
local application of pharmacological agents. Extracellular single-unit recordings from dorsal horn neurons were made near
the microdialysis fiber. TPA was tested on nociceptive dorsal horn cells. There was a significant increase in the background
activity and responses to ”brush”, with no changes in responses to pressure and pinch stimuli. TPA also significantly blocked
the PAG-induced inhibition of responses to brush, press, and pinch. These effects were eliminated by coadministration of the
PKC inhibitor NPC-15437. The solvent, which contained dimethyl sulfoxide, was also tested for its effect on the responses
to peripheral mechanical stimuli and PAG-induced inhibition of the dorsal horn neurons. There were no significant changes.
This experiment suggests that activation of the PKC second messenger system might increase the activity of dorsal horn neurons
and their responses to peripheral stimuli; in addition, the phorbol ester attenuated the PAG-induced descending inhibition
of the dorsal horn neuron activity.
Received: 15 May 1996 / Accepted: 14 November 1996 相似文献
997.
Ludman E Katon W Bush T Rutter C Lin E Simon G Von Korff M Walker E 《Psychological medicine》2003,33(6):1061-1070
BACKGROUND: A randomized trial of a primary care-based intervention to prevent depression relapse resulted in improved adherence to long-term antidepressant medication and depression outcomes. We evaluated the effects of this intervention on behavioural processes and identified process predictors of improved depressive symptoms. METHOD: Patients at high risk for depression recurrence or relapse following successful acute phase treatment (N=386) were randomly assigned to receive a low intensity 12-month intervention or continued usual care. The intervention combined education about depression, shared decision-making regarding use of maintenance pharmacotherapy and cognitive-behavioural strategies to promote self-management. Baseline, 3, 6, 9 and 12-month interviews assessed patients' self-care practices, self-efficacy for managing depression and depressive symptoms. RESULTS: Intervention patients had significantly greater self-efficacy for managing depression (P<0.01) and were more likely to keep track of depressive symptoms (P<0.0001), monitor early warning signs (P<0.0001), and plan for coping with high risk situations (P<0.0001) at all time points compared to usual care control patients. Self-efficacy for managing depression (P<0.0001), keeping track of depressive symptoms (P=0.05), monitoring for early warning signs (P=0.01), engaging in pleasant activities (P<0.0001) and engaging in social activities (P<0.0001) positively predicted improvements in depression symptom scores. CONCLUSIONS: A brief intervention designed to target cognitive-behavioural factors and promote adherence to pharmacotherapy in order to prevent depression relapse was highly successful in changing several behaviours related to controlling depression. Improvements in self-efficacy and several self-management behaviours that were targets of the intervention were significantly related to improvements in depression outcome. 相似文献
998.
Gene expression patterns and gene copy number changes in dermatofibrosarcoma protuberans 总被引:5,自引:0,他引:5
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Linn SC West RB Pollack JR Zhu S Hernandez-Boussard T Nielsen TO Rubin BP Patel R Goldblum JR Siegmund D Botstein D Brown PO Gilks CB van de Rijn M 《The American journal of pathology》2003,163(6):2383-2395
Dermatofibrosarcoma protuberans (DFSP) is an aggressive spindle cell neoplasm. It is associated with the chromosomal translocation, t(17:22), which fuses the COL1A1 and PDGFbeta genes. We determined the characteristic gene expression profile of DFSP and characterized DNA copy number changes in DFSP by array-based comparative genomic hybridization (array CGH). Fresh frozen and formalin-fixed, paraffin-embedded samples of DFSP were analyzed by array CGH (four cases) and DNA microarray analysis of global gene expression (nine cases). The nine DFSPs were readily distinguished from 27 other diverse soft tissue tumors based on their gene expression patterns. Genes characteristically expressed in the DFSPs included PDGF beta and its receptor, PDGFRB, APOD, MEOX1, PLA2R, and PRKCA. Array CGH of DNA extracted either from frozen tumor samples or from paraffin blocks yielded equivalent results. Large areas of chromosomes 17q and 22q, bounded by COL1A1 and PDGF beta, respectively, were amplified in DFSP. Expression of genes in the amplified regions was significantly elevated. Our data shows that: 1) DFSP has a distinctive gene expression profile; 2) array CGH can be applied successfully to frozen or formalin-fixed, paraffin-embedded tumor samples; 3) a characteristic amplification of sequences from chromosomes 17q and 22q, demarcated by the COL1A1 and PDGF beta genes, respectively, was associated with elevated expression of the amplified genes. 相似文献
999.
Recruitment of complement factor H-like protein 1 promotes intracellular invasion by group A streptococci 总被引:9,自引:0,他引:9
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![点击此处可从《Infection and immunity》网站下载免费的PDF全文](/ch/ext_images/free.gif)
Numerous microbial pathogens exploit complement regulatory proteins such as factor H (FH) and factor H-like protein 1 (FHL-1) for immune evasion. Fba is an FHL-1 and FH binding protein expressed on the surface of the human pathogenic bacterium, Streptococcus pyogenes, a common agent of pharyngeal, skin, and soft-tissue infections. In the present study, we demonstrate that Fba and FHL-1 work in concert to promote invasion of epithelial cells by S. pyogenes. Fba fragments were expressed as recombinant proteins and assayed for binding of FHL-1 and FH by Western blotting, enzyme-linked immunosorbent assay, and surface plasmon resonance. A binding site for FHL-1 and FH was localized to the N-terminal half of Fba, a region predicted to contain a coiled-coil domain. Deletion of this coiled-coil domain greatly reduced FHL-1 and FH binding. PepSpot analyses identified a 16-amino-acid segment of Fba which overlaps the coiled-coil domain that binds both FHL-1 and FH. To localize the Fba binding site in FHL-1 and FH, surface plasmon resonance was used to assess the interactions between the streptococcal protein and a series of recombinant FH deletion constructs. The Fba binding site was localized to short consensus repeat 7 (SCR 7), a domain common to FHL-1 and FH. SCR 7 contains a heparin binding site, and heparin was found to inhibit FHL-1 binding to Fba. FHL-1 promoted entry of Fba(+) group A streptococci into epithelial cells in a dose-dependent manner but did not affect invasion by an isogenic fba mutant. To our knowledge, this is the first report of a bacterial pathogen exploiting a soluble complement regulatory protein for entry into host cells. 相似文献
1000.
目的 研究病毒载量检测和CD4^ 计数在评价人类免疫缺陷病毒(HIV)感染者疗效中的应用效果。方法 对HIV感染者临床病例73例进行了实验室和临床观察,其中包括6例鸡尾酒治疗病例、36例中药试验性治疗病例及31例未进行治疗的感染者。主要实验室指标包括血浆病毒载量及T淋巴细胞亚群计数。结果 在进行治疗后3个月时联合治疗组的病毒载量明显低于其他两组,并且在其后保持在很低的水平,CD4^ 计数水平明显高于其他两组并在其后持续升高。在整个观察期间,中药治疗组的病毒载量检测和CD4^ 计数水平与未治疗组差异无显著性,但在临床症状观察中中药治疗组较未治疗组有明显改善。结论 病毒载量检测和CD4^ 计数试验是评价抗HIV治疗疗效的有效方法。 相似文献