Influence of Fine Grains on the Bending Fatigue Behavior of Two Implant Titanium Alloys

By means of the ultrasonic surface impact (amplitude of 30 μm, strike number of 48,000 times/mm²), nanograins have been achieved in the surfaces of both Ti6Al4V(TC4) and Ti3Zr2Sn3Mo25Nb(TLM) titanium alloys, mainly because of the dislocation motion. Many mechanical properties are improved, such as hardness, residual stress, and roughness. The rotating–bending fatigue limits of TC4 and TLM subjected to ultrasonic impact are improved by 13.1% and 23.7%, separately. Because of the bending fatigue behavior, which is sensitive to the surface condition, cracks usually initiate from the surface defects under high stress amplitude. By means of an ultrasonic impact tip with the size of 8 mm, most of the inner cracks present at the zone with a depth range of 100~250 μm in the high life region. The inner crack core to TC4 usually appears as a deformed long and narrow α-phase, while the cracks in TLM specimens prefer to initiate at the triple grain boundary junctions. This zone crosses the grain refined layer and the deformed coarse grain layer. With the gradient change of elastic parameters, the model shows an increase of normal stress at this zone. Combined with the loss of plasticity and toughness, it is easy to understand these fatigue behaviors.     

化毒清湿汤对复杂性肛瘘新型探查术后患者手术创面恢复功效研究

目的:研究化毒清湿汤对于复杂性高位肛瘘新型探查术后患者手术创面恢复及相关细胞因子水平的改善功效。方法: 从接受复杂性肛瘘新型探查术治疗的患者中选取104例纳入本次研究,入选患者随机均分为对照组与治疗组,对照组给予术后常规治疗,治疗组在对照组疗法的同时加用化毒清湿汤治疗,于术后2 d、15 d分别对比两组患者的创面面积、疼痛程度,观察创面愈合时间; 术后28 d评估两组疗效,同时观察两组患者术后2 d、28 d时血清细胞生长因子与炎性因子水平的变化。结果:治疗组总有效率98.08%高于对照组的86.54%(P<0.05); 术后15 d两组创面面积、疼痛VAS评分均有所降低且两组比较治疗组更低; 治疗组创面愈合时间为(23.71±5.57)d,对照组为(30.46±7.92)d,两组比较治疗组更低(P<0.05); 术后28 d两组各项细胞生长因子均有上升,组间比较治疗组更高,差异具有统计学意义(P<0.05); 术后28 d两组各项炎性因子均有好转,组间比较治疗组更优,差异具有统计学意义(P<0.05)。结论:化毒清湿汤可提高复杂性肛瘘新型探查术临床疗效,加快患者术后后创口愈合速度,进一步改善患者细胞生长因子与炎性因子的表达水平。     

Role of optical coherence tomography angiography in the characterization of vascular network patterns of ocular surface squamous neoplasia

PurposeTo visualize and quantify vascular networks in individuals with ocular surface squamous neoplasia (OSSN) through optical coherence tomography angiography (OCTA).MethodCross-sectional study of OSSN patients. Vascular networks were measured by OCTA in the epithelium and sub-epithelial space in the tumors, adjacent tissue, and in the contralateral eye. Vessel area density (VAD, percent of blood vessels within 2.14 mm²), was calculated for each location. Total tumor density (TTD, percent of blood vessels within the entire tumor) was calculated. VAD was assessed separately for corneal and conjunctival locations and compared.ResultsFifteen patients with OSSN were included. The mean age was 61 ± 12 years and the majority were male (80%). The mean tumor area, volume, depth, and TTD were 28.0 ± 9.0 mm² (range, 10.9–39.7), 9.1 ± 4.1 mm³ (range, 3.4–18.8), 334 ± 125 μm (range, 177–571), and 33.2% ± 11.0% (range, 18.7–58.8), respectively. The VAD was highest within the tumor (28.9% ± 8.7%) followed by the adjacent sub-epithelial tissue and the tissue underneath the conjunctival component of tumor. These densities were higher than the VAD in the tissues of the non-involved eye (all P < 0.05). The VAD within conjunctival component of tumor was significantly higher than those with corneal component (29.8% ± 9.5% vs. 21.1% ± 5.5%, p = 0.006). The VAD under conjunctival tumor was also significantly higher than under corneal component (24.1% ± 7.8% vs. 17.0% ± 6.1%, p = 0.024).ConclusionsOCTA imaging allowed for visualization and quantification of vessel structure and density within, under, and surrounding OSSN.     

Dry eye in chronic stroke patients with hemiplegia: A cross-sectional study

ABSTRACT

Objective: Dry eye is reported to be associated with several neurological diseases. The aim of this study is to evaluate the patients with hemiplegia after stroke for dry eye and compare their results with a control group.

Materials and methods: Forty-five patients with hemiplegia and 45 individuals as the control group were included in the study. Tear function tests (Schirmer and tear breakup time) and a dry eye questionnaire for dry eye symptoms (ocular surface disease index) were performed and the results of the two groups were compared.

Results: Schirmer test results were significantly lower in the post-stroke hemiplegia group compared to the control group (11.3 ± 8.2 mm and 20.6 ± 11.6 mm, respectively, p < .001). Tear breakup time results were significantly lower in the post-stroke hemiplegia group compared to the control group (7.9 ± 3.1 s and 12.1 ± 4.3 s, respectively, p < .001). Ocular surface disease index scores were not significantly different between hemiplegia and control groups (21.6 ± 20.0 and 19.8 ± 13.9, respectively, p = .635). Schirmer scores lower than 10 mm (60% and 30%, p < .001) and tear breakup time results lower than 10 s (65.6% and 28.9%, p < .001) were also higher in the hemiplegia group compared to control group.

Conclusion: We found lower Schirmer test and tear breakup time results and similar OSDI scores in hemiplegia patients compared to controls. Hemiplegia patients may have dry eye without typical symptoms. This should be taken into consideration in the follow-up and rehabilitation of post-stroke hemiplegia patients.     

从六经传变理论探“虚不受补”

[目的]从六经传变角度分析"虚不受补"的内在机理,探索完善临床遇见的"虚不受补"问题。[方法]归纳疾病传变如五脏、六经、表里传变的一般规律,总结各类传变的治疗原则,辨析虚实辨证和补法分类,分析产生"虚不受补"的常见现象,提出正确进补的原则与条件。[结果](1)有外感、肺部邪气重,先解表、宣肺,然后才能进补;(2)肠胃有邪气,不可进补,先泄邪气通腑然后可进补;(3)少阳枢机不利则气机不畅,不可进补,先理气转机方可进补;(4)疾病的治疗有表里虚实之辨,也有标本缓急之别,标本之辨在辨证施治时至关重要。[结论]"虚不受补"大多数时候是进补顺序错误导致,在进补前辨别人体的气血状态,对症施药,则可以缓解甚至消除因为进补不当带来的不舒适。解表、健脾胃、活气血、寓消于补是解决虚不受补问题的重要途径。     

A new approach for therapeutic vaccination against chronic HBV infections

There are currently about 257 million people suffering from chronic HBV infection worldwide. In many cases, an insufficient T cell response is causative for establishment of a chronic infection. To ensure a robust cellular immune response and induction of neutralizing antibodies a novel vaccine platform based on modified cell–permeable HBV capsids was utilized. Cell permeability was achieved by fusion of the membrane–permeable TLM-peptide to HBV core monomers, assembling the capsids. Insertion of a Strep-tagIII into the spike tip domain that protrudes from the capsid surface enables flexible loading with antigens that are fused to streptavidin. In this study, HBV surface antigen-derived PreS1PreS2 domain, fused to monomeric streptavidin, served as cargo antigen. Binding between antigen and capsids was characterized by surface plasmon resonance spectroscopy, electron microscopy and density gradient centrifugation. Confocal immunofluorescence microscopy and in vivo imaging of immunized mice demonstrated membrane permeability of cargo-loaded carriers and spread of antigen over the whole organism. Immunization experiments of mice revealed a robust induction of a specific cellular immune response, leading to destruction of HBV-positive cells and induction of HBV-specific neutralizing antibodies. Membrane permeability of these carriers allows needle-free application of antigen-loaded capsids as evidenced by induction of an HBV-specific CTL response and HBV-specific B cell response after oral or transdermal vaccination.These data indicate that cell–permeable antigen carriers, based on HBV capsids and loaded with HBV antigen, have the capacity to induce a cellular and a neutralizing humoral immune response. In addition, cell permeability of the vaccine platform enables antigen transfer across several cell layers, that could allow oral or transdermal immunization.     

血清SAA/CRP、CD64对儿童甲型流感早期诊断的临床价值分析

目的探讨血清淀粉酶A蛋白(SAA)与C-反应蛋白(CRP)比值SAA/CRP、中性粒细胞表面抗原CD64对儿童甲型流感早期诊断的临床价值。方法选择2017年8月~2019年2月来医院儿科就诊的125例流感症状患儿作为研究对象,根据患儿临床诊断结果将其分为甲型流感组31例、非甲型流感组94例;再选择同期在天津海河教育园区达文路卫生服务中心健康体检健康儿童30例作为对照组。患儿入组后立即留取鼻咽吸取液,采用RT-PCR鉴定流感病毒型别;采集末梢血进行7项呼吸道病毒联合检测及血清SAA、CRP以及外周血中性粒细胞表面抗原CD64表达水平。结果甲型流感组与非甲型流感组患儿血清SAA、SAA/CRP以及CD64指数显著高于对照组,甲型流感组血清SAA、SAA/CRP以及CD64指数显著高于非甲型流感组,差异均有统计学意义(P<0.05),3组儿童血清CRP水平比较差异无统计学意义(P>0.05)。运用ROC曲线分析在疑似甲型流感125例患儿中血清SAA、CRP、SAA/CRP以及CD64对甲型流感诊断价值,结果显示各指标诊断曲线下面积分别为0.908、0.641、0.994、0.957。结论甲型流感患儿血清SAA、SAA/CRP以及中性粒细胞表面受体CD64表达显著升高,在甲型流感患儿的早期临床诊断中具有较高的辅助价值。