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Concrete prepared using Gobi sand and gravel instead of ordinary sand and gravel is referred to as Gobi concrete. In order to explore the effect of fibers on the frost resistance of Gobi concrete, as well as to enhance the service life of Gobi aggregate concrete in Northwest China, experiments were conducted with fiber types (polypropylene fibers, basalt fibers, polypropylene-basalt fibers) and fiber volume fractions (0%, 0.1%, 0.2%, 0.3%) as variable parameters. This study investigated the surface morphology, mass loss rate, and relative dynamic elastic modulus of fiber-reinforced Gobi concrete after different freeze-thaw cycles (0, 25, 50, 75, 100). Corresponding frost damage deterioration models were proposed. The results indicate that fibers have a favorable effect on the anti-peeling performance, mass loss rate, and dynamic elastic modulus of Gobi aggregate concrete. The improvement levels of different fiber types are in the following order: 0.1% basalt-polypropylene fibers, 0.2% polypropylene fibers, and 0.3% basalt fibers. Compared to Gobi concrete exposed to natural environmental conditions, the freeze-thaw cycle numbers increased by 343, 79, and 69 times, respectively. A quadratic polynomial damage model for fiber-reinforced Gobi concrete, using relative dynamic elastic modulus as the damage variable, was established and demonstrated good predictive performance.
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Objective@#To detect the level of peripheral blood UL16 binding protein 2 (ULBP2) in patients with colorectal cancer, and study its value on early diagnosis and prognosis evaluation.@*Methods@#Eighty patients with colorectal cancer (colorectal cancer group) and 60 healthy subjects (healthy control group) from May 2016 to May 2019 in Affiliated Dongfeng Hospital, Hubei University of Medicine were selected. Serum expression level of ULBP2 was detected by enzyme-linked immunosorbent assay. The diagnostic efficacy of serum ULBP2 in colorectal cancer was evaluated by receiver operating characteristic (ROC) curve. The influencing factors of survival in patients with colorectal cancer were analyzed by Cox regression model. Kaplan-Meier method was used for drawing the survival curve, and log-rank test method was used for comparison.@*Results@#The serum ULBP2 level in colorectal cancer group was significantly higher than that in healthy control group: (85.52 ± 12.18) ng/L vs. (66.20 ± 8.28) ng/L, and the serum ULBP2 level of stage Ⅰ to Ⅱ in colorectal cancer group was also significantly higher than that in healthy control group: (76.44 ± 7.56) ng/L vs. (66.20 ± 8.28) ng/L, and there were statistical differences (P<0.05). ROC curve analysis result showed that the optimal cut off value of serum ULBP2 for colorectal cancer diagnosis was 79.53 ng/L, and area under curve (AUC) was 0.869, with a sensitivity of 73.75% and a specificity of 91.67%; the optimal cut off value of serum ULBP2 for stage Ⅰ to Ⅱ colorectal cancer diagnosis was 71.86 ng/L, and AUC was 0.827, with a sensitivity of 78.57%, and a specificity of 78.33%. According to the median serum ULBP2 level, the patients were divided into ULBP2 high expression (ULBP2>85.52 ng/L, 38 cases) and ULBP2 low expression (42 cases). The serum expression level of ULBP2 was related to lymph node metastasis and tissue differentiation (P < 0.05). Univariate Cox regression analysis result showed that lymph node metastasis, distant metastasis, tissue differentiation and serum ULBP2 were risk factors of poor prognosis in patients with colorectal cancer (P<0.01 or <0.05); multivariate Cox regression analysis result showed that serum ULBP2 was the independent risk factor of poor prognosis in patients with colorectal cancer (HR = 0.194, 95% CI 0.077 to 0.490, P = 0.001). The median survival time in patients with serum ULBP2 high expression was significantly shorter than that in patients with serum ULBP2 low expression (28 months vs. 50 months), and there was statistical difference (P<0.05).@*Conclusions@#Serum ULBP2 can be used as an indicator for early diagnosis and prognostic evaluation in patients with colorectal cancer.
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Objective To detect the level of peripheral blood UL16 binding protein 2 (ULBP2) in patients with colorectal cancer,and study its value on early diagnosis and prognosis evaluation.Methods Eighty patients with colorectal cancer (colorectal cancer group) and 60 healthy subjects (healthy control group) from May 2016 to May 2019 in Affiliated Dongfeng Hospital,Hubei University of Medicine were selected.Serum expression level of ULBP2 was detected by enzyme-linked immunosorbent assay.The diagnostic efficacy of serum ULBP2 in colorectal cancer was evaluated by receiver operating characteristic (ROC) curve.The influencing factors of survival in patients with colorectal cancer were analyzed by Cox regression model.Kaplan-Meier method was used for drawing the survival curve,and log-rank test method was used for comparison.Results The serum ULBP2 level in colorectal cancer group was significantly higher than that in healthy control group:(85.52 ± 12.18) ng/L vs.(66.20 ± 8.28) ng/L,and the serum ULBP2 level of stage Ⅰ to Ⅱ in colorectal cancer group was also significantly higher than that in healthy control group:(76.44 ± 7.56) ng/L vs.(66.20 ± 8.28) ng/L,and there were statistical differences (P ＜ 0.05).ROC curve analysis result showed that the optimal cut off value of serum ULBP2 for colorectal cancer diagnosis was 79.53 ng/L,and area under curve (AUC) was 0.869,with a sensitivity of 73.75％ and a specificity of 91.67％;the optimal cut off value of serum ULBP2 for stage Ⅰ to Ⅱ colorectal cancer diagnosis was 71.86 ng/L,and AUC was 0.827,with a sensitivity of 78.57％,and a specificity of 78.33％.According to the median serum ULBP2 level,the patients were divided into ULBP2 high expression (ULBP2 ＞ 85.52 ng/L,38 cases) and ULBP2 low expression (42 cases).The serum expression level of ULBP2 was related to lymph node metastasis and tissue differentiation (P ＜ 0.05).Univariate Cox regression analysis result showed that lymph node metastasis,distant metastasis,tissue differentiation and serum ULBP2 were risk factors of poor prognosis in patients with colorectal cancer (P ＜ 0.01 or ＜ 0.05);multivariate Cox regression analysis result showed that serum ULBP2 was the independent risk factor of poor prognosis in patients with colorectal cancer (HR =0.194,95％ CI 0.077 to 0.490,P =0.001).The median survival time in patients with serum ULBP2 high expression was significantly shorter than that in patients with serum ULBP2 low expression (28 months vs.50 months),and there was statistical difference (P ＜ 0.05).Conclusions Serum ULBP2 can be used as an indicator for early diagnosis and prognostic evaluation in patients with colorectal cancer.
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To improve the energy dissipation capacity of rubber isolation bearings, it is important to find a new rubber material with good applicability and high damping properties. Two types of blends were prepared using nitrile rubber (NBR), brominated butyl rubber (BIIR) and ethylene-vinyl acetate copolymer (EVA): NBR/BIIR and NBR/BIIR/EVA. The vulcanization, mechanical and damping properties of the blends were analyzed. The results show that both blends exhibit excellent vulcanization plateaus and mechanical properties. For NBR/BIIR, as the BIIR content increases, the complementary effects of NBR and BIIR afforded by blending are enhanced. Two damping peaks appeared in the tanδ-T curve and shifted toward lower and higher temperatures, respectively, which clearly widened the effective damping temperature range. However, the damping value in the valley of the tanδ-T curve was as low as 0.39. For NBR/BIIR/EVA, the addition of EVA greatly increased damping in the valley of the tanδ-T curve to approximately 0.54. EVA was observed to be the optimal polymer for improving the compatibility of the NBR/BIIR blend. Moreover, hot air thermal aging tests showed that both blends demonstrated good stability.
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MicroRNAs (miRNAs) a class of non-coding RNAs about 22 nt in size that are found in a wide range of organisms from plants, viruses to humans. MicroRNA has a wide range of biological functions. It can recruit related RNA enzymes and lead to mRNA degradation after binding to mRNA specificity, thus blocking the expression of protein encoding genes and then affecting their biological functions. In recent years, microRNA has been found to be closely related to the biological behaviors, such as the occurrence, development, invasion and metastasis of multiple human malignant carcinomas, and play a regulatory role in the above biological phenotypes. Lung cancer is the highest incidence of malignancy. The exact molecular mechanism of its occurrence and development has not been fully elucidated. Previous studies have shown that microRNA plays an important role in lung tumor suppressor gene inactivation, oncogene activation and epigenetics. At the same time, there are also reports that there is a significant difference in the expression of microRNA in patients with lung cancer and benign lung diseases. This differential expression provides a basis for the feasibility of microRNA as a diagnostic and pre biological marker for lung cancer. .
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Humanos , Neoplasias Pulmonares , Diagnóstico , Genética , Patologia , MicroRNAs , Genética , Invasividade Neoplásica , Metástase NeoplásicaRESUMO
Objective To evaluate the effect of curing achalasia by transabdominally Heller-Dor operation. Methods To summarize 33 cases of achalasia treated by transabdominally Heller-Dor procedure and visit them postoperatvely. 18 patients receive pre- and post-operativemanometry and 24-hour-pH monitoring. The parameters including reflux frequency 、the longest lasting-time of reflux 、the total time(min) of pH ＜4.0 and the percentage( % ) of time of pH ＜4.0 were recorded and compared using statistical mothods. Results Symptom was significantly improved in 32 patients after surgery, while 1 patient remained dysphasia as pre-operative. The LESP, the reflux frequency、the longest lasting-time of reflux 、the total time(min) of pH ＜ 4.0 and the percentage ( % ) of time of pH ＜ 4.0 also declined after operations ( P ＜ 0. 05 ). 30 patients were followed up,22 (73.3% ,22/30) were cured and 8 had mild sypmtom. Reflux did not detected in 3 cases( 16.7% ,3/18 ) with preoperative reflux. Conclusion Transabdominally Heller-Dor operation could dramadically alleviate the symptoms of patients with achalasia, moreover, it could especially prevent the postoperative-reflux, and with the advantages of simple operations, little traumas.
