Objective To investigate the relationship between pentraxin 3(PTX3)and first-pass effect of mechanical thrombectomy in patients with large vessel occlusion acute ischemic stroke(AIS).Methods A total of 136 AIS patients with large vessel occlusion treated in Liaocheng People's Hospital from January to August 2023 were selected,and they were divided into first pass group(n=41)and non-first pass group(n=95)according to whether they achieved first-pass effect of mechanical thrombectomy.The clinical data of all patients were collected and the serum PTX3 levels were detected.All patients were followed up for 3 months,and the prognosis was evaluated according to the modified Rankin score.Multivariate Logistic regression was used to analyze the influencing factors of first-pass effect in AIS patients with large vessel occlusion.ROC analysis was used to analyze the predictive value of serum PTX3 for first-pass effect in AIS patients with large vessel occlusion.Results The rate of good prognosis in the first pass group was higher than that in the non-first pass group(56.10％vs 36.84％),and the difference was significant(x2=4.341,P=0.037).Compared with the non-first pass group,the age(59.38±5.12 years),the proportion of hypertension(43.90％),the National Institutes of Health Stroke Scale(NIHSS)score at admission(13.58±4.16 score)in the first pass group and serum PTX3 level(1.21±0.32 ng/L)in the first pass group were lower than those in the failed group(63.45±7.61 years,65.26％,15.75±5.13 score,1.71±0.41 ng/L),and the differences were significant(t/x2=3.129,5.395,2.389,6.944,all P＜0.05).Multivariate Logistic regression analysis showed that younger age[OR(95％CI):0.859(0.752～0.982)],no hypertension[OR(95％CI):0.672(0.480～0.942)],decreased NIHSS score at admission[OR(95％CI):0.867(0.781～0.962)]and decreased serum PTX3 levels[OR(95％CI):0.558(0.326～0.954)]were the influencing factors of the first-pass effect of mechanical thrombectomy in AIS patients with large vessel occlusion(Waldx2=4.997,5.238,7.280,4.543,all P＜0.05).After 3 months of follow-up,the serum PTX3 level of the good prognosis group was lower than that of the poor prognosis group(1.28±0.39 ng/L vs 1.65±0.43 ng/L),and the difference was significant(t=5.111,P＜0.001).ROC analysis showed that serum PTX3 had a high predictive value for first-pass effect and poor prognosis in AIS patients with large vessel occlusion,with the areas under the curve(95％CI)of 0.785(0.703～0.866)and 0.734(0.651～0.806),respectively,and their optimal cut-off values were 1.38 ng/L and 1.56 ng/L,respectively.Conclusion The first-pass effect of mechanical thrombectomy in AIS patients with large vessel occlusion is beneficial to the short-term prognosis.The expression of serum PTX3 is closely related to the first-pass effect in AIS patients with large vessel occlusion,and this index could have a high predictive value for whether the patients can achieve the first-pass effect.

In order to solve the problem of dust hazard of vibrating screen machine and difficult treatment in catalyst production process, computational fluid dynamics software Fluent was used to carry out numerical simulation calculation of the local exhaust dust removal system for the main dust dispersing points of the vibrating screen machine, including fine/coarse particles outlet and product outlet blowing and cleaning the dust points. The optimal design scheme and key technical parameters of local ventilation and dust removal system of vibrating screen machine were proposed. The results showed that the dust diffusion could be prevented by setting up an upper suction hood without air blowing, but the exhaust air volume needed to be calculated accurately. On the premise of purge, it is necessary to control the air volume to form a wind speed band of 8 m/s with a height of 15 cm at the feed port, so as to effectively remove the dust on the surface of solid particles of catalyst products and ensure that the catalyst products will not be blown away when falling into the feed barrel. The simulated design was applied to the vibrating sieve powder machine of a catalyst company, and the maximum dust concentration in the workplace was reduced from 45.80 mg/m 3 to 5.46mg/m 3, which effectively improved the working environment in the workplace.

In order to solve the problem of dust hazard of vibrating screen machine and difficult treatment in catalyst production process, computational fluid dynamics software Fluent was used to carry out numerical simulation calculation of the local exhaust dust removal system for the main dust dispersing points of the vibrating screen machine, including fine/coarse particles outlet and product outlet blowing and cleaning the dust points. The optimal design scheme and key technical parameters of local ventilation and dust removal system of vibrating screen machine were proposed. The results showed that the dust diffusion could be prevented by setting up an upper suction hood without air blowing, but the exhaust air volume needed to be calculated accurately. On the premise of purge, it is necessary to control the air volume to form a wind speed band of 8 m/s with a height of 15 cm at the feed port, so as to effectively remove the dust on the surface of solid particles of catalyst products and ensure that the catalyst products will not be blown away when falling into the feed barrel. The simulated design was applied to the vibrating sieve powder machine of a catalyst company, and the maximum dust concentration in the workplace was reduced from 45.80 mg/m 3 to 5.46mg/m 3, which effectively improved the working environment in the workplace.

Objective:To investigate the relationship between SNP and noise-induced hearing loss (NIHL) susceptibility in occupational noise exposure population in China.Methods:From 6297 for a certain steel works in contact with noise, contact length of 3 years or more and workplace noise exposure intensity of 80 dB (A) , ears or high frequency (3 000, 4 000, 6 000 Hz) average of hearing acuity 40 dB (HL) , or high frequency loss in both ears, on the basis of single whisper frequency (500, 1, 000, 2 000 Hz) average threshold of 26 dB (HL) or object as case group. A case-control study was designed with 1:1 matching. Subjects with the same gender, the same type of work, age ±5 years old, and working age ±2 years after noise exposure were selected as the control group. Subjects with any whisper frequency (500, 1, 000, 2, 000 Hz) whose hearing threshold in any frequency band was ≤25 dB (A) and whose average high-frequency hearing threshold in pure tone hearing test was <35 dB (A) were selected as the control group. Four sites of PON2 gene were genotyped by medium-and high-throughput SNP genotyping. Univariate logistic regression was used to analyze the relationship between single SNP polymorphism and NIHL.Results:A total of 286 case-control pairs were included. Smoking was statistically significant difference between cases and controls ( P<0.001) . Conclusion:No statistical difference has been found between single SNP polymorphism and NIHL. At the level of greater than 92 dB of high noise exposure, rs7785846 (CT+TT) genotype is a risk factor for occupational noise deafness, and its OR is 2.74 (95% CI: 1.09-6.89) compared with wild homozygous type (CC) . Conclusion. The rs7785846 (CT+TT) genotype carriers of PON2 gene are more susceptible to hearing impairment when exposed to high noise intensity.

Objective:To investigate the relationship between SNP and noise-induced hearing loss (NIHL) susceptibility in occupational noise exposure population in China.Methods:From 6297 for a certain steel works in contact with noise, contact length of 3 years or more and workplace noise exposure intensity of 80 dB (A) , ears or high frequency (3 000, 4 000, 6 000 Hz) average of hearing acuity 40 dB (HL) , or high frequency loss in both ears, on the basis of single whisper frequency (500, 1, 000, 2 000 Hz) average threshold of 26 dB (HL) or object as case group. A case-control study was designed with 1:1 matching. Subjects with the same gender, the same type of work, age ±5 years old, and working age ±2 years after noise exposure were selected as the control group. Subjects with any whisper frequency (500, 1, 000, 2, 000 Hz) whose hearing threshold in any frequency band was ≤25 dB (A) and whose average high-frequency hearing threshold in pure tone hearing test was <35 dB (A) were selected as the control group. Four sites of PON2 gene were genotyped by medium-and high-throughput SNP genotyping. Univariate logistic regression was used to analyze the relationship between single SNP polymorphism and NIHL.Results:A total of 286 case-control pairs were included. Smoking was statistically significant difference between cases and controls ( P<0.001) . Conclusion:No statistical difference has been found between single SNP polymorphism and NIHL. At the level of greater than 92 dB of high noise exposure, rs7785846 (CT+TT) genotype is a risk factor for occupational noise deafness, and its OR is 2.74 (95% CI: 1.09-6.89) compared with wild homozygous type (CC) . Conclusion. The rs7785846 (CT+TT) genotype carriers of PON2 gene are more susceptible to hearing impairment when exposed to high noise intensity.

Objective To investigate the effects of microRNA-205-3p (miR-205-3p) and microRNA-205-5p (miR-205-5p) on the cell proliferation,migration and invasion of head and neck squamous cell carcinoma (HNSCC).Methods The miRNA expression data were obtained from The Cancer Genome Atlas,and were used to determine miR-205 expression in HNSCC and paracancerous tissues.Quantitative real-time fluorescent polymerase chain reaction (qRT-PCR) was used to detect the expressions of miR-205-3p and miR-205-5p in HNSCC cell lines 5-8F,6-10B,CNE2,Tu686 and mucosal tissues of nasopharynx.MiR-205-3p inhibitor,miR-205-5p inhibitor and miR-NC were transfected into Tu686 cells,and qRT-PCR was employed to evaluate the silence efficiency.In the following study,the cells were divided into four groups:miR-205-3p inhibitor and control,miR-205-5p inhibitor and control.Then the cell counting kit (CCK-8) assay,Transwell migration and invasion assays were carried out to examine the proliferation,migration and invasion abilities of the cells in the four groups.Results Compared with paracancerous tissues,the higher expression of miR-205 in HNSCC tissues was observed [M (QR):61 012 (51 448) vs.28 579 (35 959),Z =-6.420,P ＜ 0.001)].The expression levels of miR-205-3p in HNSCC cell lines 5-8F,6-10B,CNE2,Tu686 and mucosal tissues of nasopharynx were 0.36 ± 0.07,0.20 ± 0.06,0.15 ± 0.04,0.25 ± 0.04 and 1.00 ±0.00 respectively,with a significant difference (F =162.71,P ＜ 0.001).The expression levels of miR-205-5p in cell lines 5-8F,6-10B,CNE2,Tu686 and mucosal tissues of nasopharynx were 0.20 ±0.01,0.21 ±0.01,1.06 ±0.18,23.61 ±2.07 and 1.00 ±0.00 respectively,with a significant difference (F =371.81,P ＜0.001).Compared with 5-8F,6-10B,CNE2 cells,the expression of miR-205-3p in Tu686 cells was higher than those in 6-10B,CNE2 cells (P =0.195;P =0.020),and lower than that in 5-8F cells (P =0.023),and the expression of miR-205-5p in Tu686 cells was the highest (P ＜ 0.001;P ＜ 0.001;P ＜ 0.001).The expressions of miR-205-3p and miR-205-5p in Tu686 cells were effectively downregulated by inhibitors,and the silence efficiencies were 87％ and 83％,respectively.The absorbance (A) values of miR-205-3p inhibitor group on the first,second,third,fourth and fifth day were 0.26 ± 0.06,0.55 ± 0.11,1.52 ±0.13,1.91 ± 0.07,2.14 ± 0.24,and those of miR-NC group were 0.29 ± 0.07,0.78 ± 0.11,1.59 ±0.15,1.95 ±0.08,2.02 ±0.12.There were no significant differences between the two groups (t =0.506,P=0.639;t =2.459,P=0.070;t =0.573,P=0.597;t =0.655,P=0.548;t=-0.759,P=0.490).The cell proliferations of miR-205-5p inhibitor group on the first,second,third,fourth and fifth day were 0.30 ± 0.08,0.61 ± 0.08,0.85 ± 0.08,1.08 ± 0.12,1.16 ± 0.18,and those of miR-NC group were 0.41 ± 0.10,0.78 ± 0.14,1.33 ± 0.28,1.87 ± 0.09,2.08 ± 0.19.The cell proliferations of miR-205-5p inhibitor group on the third,fourth and fifth day were significantly lower than those of miR-NC group (t =3.665,P =0.017;t =12.223,P ＜ 0.001;t =7.825,P ＜ 0.001).Transwell migration assay demonstrated that downregnlation of miR-205-3p had no significant effect on migration abilities of Tu686 cells.The numbers of cell permeating septum of miR-205-3p inhibitor group and miR-NC group were 192.00 ± 28.49 and 188.40 ± 22.52,respectively.There was no significant difference between the two groups (t =-0.160,P =0.877).Downregulation of miR-205-5p significantly decreased the migration abilities of Tu686 cells.The numbers of cell permeating septum of miR-205-5p inhibitor group and miR-NC group were 109.40 ± 27.63 and 183.60 ± 31.63,respectively,and the difference was statistically significant (t =3.951,P =0.004).Transwell invasion assay showed that the numbers of cell permeating septum of miR-205-3p inhibitor group and miR-NC group were 93.40 ± 10.24 and 96.20 ± 16.56,respectively.There was no significant difference between the two groups (t =0.322,P =0.756).The numbers of cell permeating septum of miR-205-5p inhibitor group and miR-NC group were 53.00 ± 17.80 and 94.40 ± 14.38,respectively,and the difference was statistically significant (t =4.045,P =0.004).Conclusion Downregulation of miR-205-5p can inhibit the proliferation,migration and invasion abilities of Tu686 cells.However,downregulation of miR-205-3p has no significant effect on the proliferation,migration and invasion of Tu686 cells.

Graphene ( GN) and multiwalled carbon nanotubes ( MWCNT) composites were coated on glassy carbon electrode ( GCE ) and then poly ( nicotinic acid ) ( PNA ) was electrodeposited on the modified electrode. The electrochemical behavior of pyridoxine hydrochloride ( VB6 ) was investigated at the modified electrode by cyclic voltammetry ( CV ) and differential pulse voltammetry ( DPV ) . Results showed the oxidation current of VB6 at the GN-MWCNT/PNA/GCE was obviously larger than that at GCE, PNA/GCE and GN/MWCNT/GCE. The oxidation process of VB6 was an irreversible diffusion-controlled process involving one electron and two protons. The liner range between the peak current intensity of DPV and the concentration of VB6 was 0 . 05-200 μmol/L with a detection limit of 0 . 02 μmol/L ( S/N=3 ) . The modified electrode showed a good reproducibility with a relative standard deviation of 3 . 1% ( n=8 ) . The proposed method was applied to the analysis of vitamin B6 in vitamin B6 tablets and compound vitamin B tablets with recoveries between 96 . 1%-104 . 5%.

Objective To investigate the expression and the effects of tissue inhibitor of metalloproteinases-1 (TIMP-1) on lungs of rats with sepsis.Methods Forty Sprague-Dawley (SD) rats were randomly divided into two groups,namely sham group (n =8) and sepsis model group (n =32).The rats of model group were modeled by cecal ligation and puncture (CLP),and were further divided into four subgroups as per the time after modeling,namely 6 h (n =8),12 h (n =8),24 h (n =8),48 h (n =8)subgroups.Blood and lung samples were taken 6 h,12 h,24 h and 48 h after modeling.The histological changes in lungs of the rats were observed under light microscope.Expressions of TIMP-1 mRNA,Bax mRNA and Bcl-2 mRNA in lungs were measured by RT-PCR.The immunohistochemistry was used to label the CD18 in lungs during different phases of sepsis.The data were processed by t test.Results Compared with sham group,the lung tissues of rats in model group were injured to a certain extent after CLP.The expression of TIMP-1 mRNA and the number of CD18 positive cells increased at the same time (P ＜ 0.01),and peaked 24 hours later (P ＜ 0.01).While the expression of Bax mRNA in model group decreased markedly 12-48 hours after modeling (P ＜ 0.01-0.05),and reached minimum 48 hours later (P ＜ 0.01).The expression of Bcl-2 mRNA in model group changed unnoticeable.The positive correlation between variations in number of CD18 positive cells and expression of TIMP-1 mRNA was found in model group (r =0.426,P ＜ 0.01).Conclusions The increase in expression of TIMP-1 mRNA in lungs is closely associated with the lung injury of sepsis.The mechanism of lung injury is likely attributed to the preservation of inflammatory cells from apoptosis,and the persistent inflammation response causes tissue damage,leading to organ dysfunction.

OBJECTIVE: To investigate the ubiquitin expression in laryngeal squamous cell carcinoma (LSCC) whether along with local lymph node metastasis, and further study its correlation with local lymph node metastasis and other clinicopathological parameters in laryngeal squamous cell carcinoma. METHOD: We detected the different expression level of ubiquitin in paraffin specimens between 19 cases of LSCC associated with cervical lymph node metastasis LSCC(N+) and 20 cases of LSCC not associated with cervical lymph node metastasis LSCC(N-) by immunohistochemical staining combined with stereology image analysis system. Statistics were analyzed by student test, variance analysis and ROC curve. RESULT: Ubiquitin expression in LSCC(N+) was significantly higher than LSCC(N-) (P < 0.01); their expression level was not correlated with age,history of tobacco, alcohol addiction, clinical stage and primary site,etc. CONCLUSION Ubiquitin was significantly up-expressed in LSCC(N+) than ILSCC (N-), which may imply that it is one of the important elements in mechanism of lymph node metastasis in LSCC.
Adult ; Aged ; Carcinoma, Squamous Cell ; metabolism ; pathology ; Female ; Head and Neck Neoplasms ; metabolism ; pathology ; Humans ; Laryngeal Neoplasms ; metabolism ; pathology ; Lymph Nodes ; pathology ; Lymphatic Metastasis ; Male ; Middle Aged ; Squamous Cell Carcinoma of Head and Neck ; Ubiquitin ; metabolism

OBJECTIVE: To investigate the expression and biological significance of HMGB1 and VEGF protein in tissue specimens of laryngeal squamous cell carcinoma (LSCC), and further study the correlation between HMGB1 and VEGF protein. METHOD: The expression of HMGB1 and VEGF protein was evaluated by immunohistochemical staining in 69 cases of LSCC specimens and 15 cases of adjacent epithelial tissue samples, and futher correlated with clinicopathologic parameters. RESULT: The positive rates of HMGB1 and VEGF in LSCC tissues were significantly higher than those in adjacent non-cancerous mucosa (P < 0.01), and the expression of these two marks was closely correlated with clinical stage (P < 0.05) and metastasis (P < 0.05) in LSCC. While the expression of HMGB1 and VEGF had no significant correlations with age, sex, histological differentiation and tumor site (P > 0. 05). There was a positive correlation between the expression of HMGB1 and VEGF (P < 0.05). The Kaplan-Meier survival analysis showed that patients with strong expression of HMGB1 or VEGF had poorer overall survival compared with that in patients with relative low HMGB1 or VEGF expression (P < 0.05). Multivariate COX regression analysis revealed that both lymph node metastasis and HMGB1 expression were independent prognostic factors for patients with LSCC. CONCLUSION This study demonstrated that HMGB1 and VEGF protein overexpression were closely associated with clinical stage, metastasis and poorer prognosis in patients with LSCC. Increased expression of these two proteins in LSCC suggested that HMGB1 and VEGF might play a critical role in the initiation and progression of LSCC.
Adult ; Aged ; Aged, 80 and over ; Carcinoma, Squamous Cell ; metabolism ; pathology ; Female ; HMGB1 Protein ; metabolism ; Humans ; Laryngeal Neoplasms ; metabolism ; pathology ; Lymphatic Metastasis ; Male ; Middle Aged ; Neoplasm Staging ; Vascular Endothelial Growth Factor A ; metabolism