OBJECTIVETo investigate the occupational exposure levels of dust in new suspension preheated dry process (NSP) cement production line and put forward rectification measures for dust-exposed posts, and to provide ideas for the modern cement production enterprises in dust control and occupational health management.

METHODSOccupational health field investigation combined with field test were used to measure the time-weighted average concentration (C(TWA)) of the dust in the workplace. Rectification measures were taken for the dust-exposed posts with unqualified dust concentration, and the protective effects of dustproof facilities in the rectified workplace were evaluated.

RESULTSThe field investigation revealed incompletely closed dustproof facilities, improperly set dust hoods, excess of dust leakage points, and other problems in the dust-exposed posts of an NSP cement production line before rectification, and the dustproof facilities could hardly exert dust removal effect. The field test showed that the vast majority of dust-exposed posts had the dust concentrations exceeding the occupational exposure limits (OELs), with a qualified rate as low as 31.8%. A series of rectification measures were taken for these posts. After the rectification, the dust-exposed posts demonstrated dramatically dropped C(TWA), and the qualified rate of dust concentration in the dust-exposed posts rose to 90.9%.

CONCLUSIONThe dust hazards in NSP cement production line cannot be ignored. Taking appropriate protective measures are critical for curbing dust hazards in modern cement production.

Air Pollutants, Occupational ; analysis ; Construction Materials ; Dust ; analysis ; Humans ; Occupational Exposure ; analysis ; prevention & control ; Workplace

AIM To optimize the subcritical aqueous extraction for polysaccharides from the leaves of Punica granatum L.and to evaluate the in vitro antioxidant activity.METHODS With reaction pressure,solid-liquid ratio,extraction time and extraction temperature as influencing factors,yield of polysaccharides as an evalution index,the extraction was optimized by Box-Behnken method on the basis of single factor test.Then the scavenging effects of polysaccharides on hydroxyl free radical,superoxide anion and DPPH free radical were detected.RESULTS The optimal conditions were determined to be 5 MPa for reaction pressure,1 ∶ 27 for solid-liquid ratio,11 min for extraction time,and 155 ℃ for extraction temperature,the yield of polysaccharides was 1.809％.There was a dose-effect relationship between scavenging rate and polysaccharides' concentration.0.1 mg/mL Polysaccharides displayed the strongest scavenging effects on hydroxyl free radical,superoxide anion and DPPH free radical with the clearance rates of 57.36％,70.51％ and 58.02％,respectively.CONCLUSION This stable and reliable method can be used for the subcritical aqueous extraction for polysaccharides from P.granatum leaves with obvious in vitro antioxidant activity.

Objective To analyses the clinical characteristics and electrophysiologieal finding of 106 patients with auditory neuropathy (AN).Investigate the differencial curve type of pure tone audiogram and the abnormal ABR.Methods Review the history of patients,pure tone audiometry,middle ear acoustic reflexes,auditory brainstem response,distortion product otoacoustic emission and radiologic imaging studies of the brain of 106 patients with AN during December 2001 to May 2007 in retrospect.Results The 106 patients with AN were of both genders.The age were between 11-37 years old.and the average age was 17.5 years old.The most patients were adolescences(70.8%).Twelve cases of the 106 patients had evidence of other peripheral neuropathy in addition to hearing loss.Another 94 patients were idiopathic origins.The pure tone audiogram showed a minimal to moderate sensorineural hearing loss at low frequencies 0.5 kHz and 0.25 kHz in 209 errs(98.6%).The average hearing threshold(WHO 1997)in 23.2% of disordered ears at less than 25 dB in the "normal" range.Auditory brainstem response could not be recorded in 124 ears (58.5%) at maximum stimulus.The other 88 ears showed lor 2 wave,but the wave were small.There were 23 patients which one side ear ABR was 1 or 2 small waves presented.but the contralateral side were all waves absent.In 3 cases of AN with other peripheral neuropathy which ABR were both ears 1 or 2 small wave ear recorded.However,1 patient in our sample could not be detected distortion product otoacoustic emission at 3-6 kHz(left ear) and 5-6 kHz(right ear).Conclusions AN was not rare in adolescences.The average hearing threshold for AN should be discussed.

OBJECTIVETo analyze the outcome of the patients with gastric gastrointestinal stromal tumor(GIST) after surgical treatment and identify the associated risk factors.

METHODSClinical data and the tissue slices including immunohistochemistry staining of 140 patients with gastric GIST from January 1990 to December 2008 were retrospectively reviewed. SPSS 16.0 for Windows software package was used for statistical analysis.

RESULTSThe overall survival rates of 1-, 3-, 5-year were 96.8%, 86.7% and 79.3%, respectively. The survival rates of 1-, 3-, 5-year were 98.1%, 90.0% and 85.4% in patients who underwent complete tumor resection. But the survival rates of 1-, 3-, 5-year were 38.1%, 0 and 0 in patients with incomplete tumor resection. The differences were statistically significant (P<0.05). Gender, preoperative metastasis, tumor size,pathology type,karyokinesis, recurrence and metastasis were associated with survival rates in patients with complete tumor resection by univariate analysis. However, only tumor size, karyokinesis, recurrence and metastasis were associated with survival rates by Cox regression multivariable analysis(P<0.05).

CONCLUSIONSurgery remains the main treatment for gastric GIST. Local complete resection is the principal treatment.

Adult ; Aged ; Aged, 80 and over ; Female ; Gastrointestinal Stromal Tumors ; surgery ; Humans ; Male ; Middle Aged ; Prognosis ; Retrospective Studies ; Stomach Neoplasms ; surgery ; Survival Rate ; Treatment Outcome ; Young Adult

OBJECTIVETo analyze the effects of surgical treatment for gastrointestinal stromal tumors (GISTs) and influential factors of survival.

METHODSThe clinical data and the tissue slices including immunohistochemical staining of 153 cases of GISTs from January 1990 to March 2006 were rechecked retrospectively. All patients were followed up carefully. More attention was paid to the surgical effects and the influential factors of survival.

RESULTSThe overall survival rates at 1-, 2-, 3-, 4- and 5-year were 94.9%, 83.3%, 73.3%, 70.5% and 64.3%, respectively. The median survival time for patients with tumor resected completely was 66.0 months, and the 2- and 5-year survival rate were 89.4% and 70.9% respectively. The median survival time was 23.8 months for the patients with tumor resected partly, and only two of these patients survived over 2 years. Gender, tumor sites, preoperative metastasis, tumor size, pathological type, karyokinesis and recurrence and metastasis were related with survival rates for the patients with tumor resected completely on univariate analysis, but tumor size, pathology type, recurrence and metastasis were related with survival rates on Cox regression multivariate analysis (P < 0.05).

CONCLUSIONSSurgery should still be the main therapy for GISTs. Local complete resection is the principal treatment. The survival cannot be improved by extensive resection and lymph nodes clearance.

Adult ; Aged ; Aged, 80 and over ; Antigens, CD34 ; analysis ; Female ; Follow-Up Studies ; Gastrointestinal Stromal Tumors ; metabolism ; mortality ; surgery ; Humans ; Immunohistochemistry ; Kaplan-Meier Estimate ; Male ; Middle Aged ; Proto-Oncogene Proteins c-kit ; analysis ; Retrospective Studies ; Survival Rate ; Treatment Outcome

OBJECTIVETo study the molecular risk factors of lymph node metastasis in stage T1 and T2 colorectal cancers by tissue microarray and immunohistochemistry techniques.

METHODSTwo hundred and three patients with stage T1 and T2 colorectal carcinoma who underwent radical surgery from 1999 to 2010 in our department were included in this study. Their clinicopathological data were retrospectively analyzed. Expression of the following 14 molecular markers were selected and assayed by tissue microarray and immunohistochemistry: VEGFR-3, HER2, CD44v6, CXCR4, TIMP-1, EGFR, IGF-1R, IGF-2, IGFBP-1, ECAD, MMP-9, RKIP, CD133, MSI. Chi-squared test and logistic regression were used to evaluate the variables as potential risk factors for lymph node metastasis.

RESULTSThe positive expression rates of biomarkers were as following: VEGFR-3 (44.3%), EGFR (30.5%), HER-2 (28.1%), IGF-1R (63.5%), IGF-2 (44.8%), IGFBP-1 (70.9%), ECAD (45.8%), CD44v6 (51.2%), MMP-9 (44.3%), TIMP-1 (41.4%), RKIP (45.3%), CXCR4 (40.9%), and CD133 (49.8%). The positive rate of MSI expression was 22.2%. Both univariate and multivariate analyses showed that VEGFR-3, HER-2, and TIMP-1 were significant predictors of lymph node metastasis. Univariate analysis showed that CD44v6 and CXCR4 were significant significant predictors of lymph node metastasis.

CONCLUSIONSVEGFR-3, HER2 and TIMP-1 are independent factors for lymph node metastasis in stage T1 and T2 colorectal cancers.

Aged ; Biomarkers, Tumor ; metabolism ; Colonic Neoplasms ; metabolism ; pathology ; Female ; Humans ; Hyaluronan Receptors ; metabolism ; Immunohistochemistry ; Lymphatic Metastasis ; Male ; Microsatellite Instability ; Middle Aged ; Neoplasm Staging ; Oligonucleotide Array Sequence Analysis ; Receptor, ErbB-2 ; metabolism ; Receptors, CXCR4 ; metabolism ; Rectal Neoplasms ; metabolism ; pathology ; Retrospective Studies ; Tissue Inhibitor of Metalloproteinase-1 ; metabolism ; Vascular Endothelial Growth Factor Receptor-3 ; metabolism

Objective To explore the electrophysiological results and rehabilitation outcome of two prelingually deafened pediatric cochlear implant patients with auditory neuropathy.Methods Preoperative audiological evaluation,intra-postoperative electrically evoked auditory brainstem response(EABR)and neural response telememetry(NRT)record for the two cases were conducted in Beijing Tongren Hospital.A one year follow-up was performed.Data collected before and at 6,12-month intervals after implantation were compared with that from control pediatric cochlear implant patients matched for the same duration of implant use as this two cases. Results The two children implanted had not had any postoperative medical or cochlear implant device complications. Intraoperative EABR and NRT were elicited in case 1 with unrepeatable waveforms. After 12 months of training,Case 1 had shown significant improvements in sound detection,speecn perception abilities and communication skills,which was better than the control group.and the eJectrophysiological results became normal.Case 2 had also benefited from cochlear implantation, even though no recognizable NRT was found until he returned 12 month after the operation.Conclusions The desynchronization of auditory path had been changed after the electrical stimulation ongoing 12 months for children with auditory neuropathy.The two children had not had any complications postoperatively,and eacn child had shown improved listening and communication skills. Cochlear implantation COUld help patients witn auditory neuropathy to improve their communication skill and go back to the main stream.

OBJECTIVE: To evaluate the clinical efficacy of local infiltration anesthesia of ropivacaine combined with compound betamethasone for postoperative analgesia in patients with hallux valgus. METHODS: From September 2019 to December 2020, 48 patients with hallux valgus were treated surgically. According to different postoperative analgesia methods, the patients were divided into combined local infiltration group and intravenous analgesia pump group. There were 24 cases, in the combined local infiltration group including 2 males and 22 females;the age ranged from 21 to 78 years old, with an average of (58.3±7.7) years old;soft tissue release and chevron osteotomy were performed in 15 cases and metatarsophalangeal joint fusion in 9 cases;immediately after operation, 20 ml of ropivacaine combined with compound betamethasone mixed diluent was used for local infiltration anesthesia once. There were 24 patients in intravenous analgesia pump group, including 3 males and 21 females;the age ranged from 23 to 81 years old, with an average of(56.8±8.3) years old;soft tissue release and Chevron osteotomy were performed in 17 cases and metatarsophalangeal joint fusion in 7 cases;immediately after operation, intravenous analgesia pump was used for analgesia. The basic flow was 2 ml / h;the self control dose was 0.5 ml;and the locking time was 15 min. Visual analogue scale (VAS) was recorded at 12, 24, 48 and 72 hours after operation;and the VAS was recorded at 24 hours after operation. The occurrence of adverse drug reactions at 0 to 12 hours, 12 to 24 hours and 24 to 48 hours after operation were recorded;and the healing of incision was recorded. RESULTS: All patients were followed up, and the duration ranged from 14 to 17 days, with a mean of (14.60±0.92) days. There was significantdifference in VAS at 12, 24 and 48 hours between the combined local infiltration group and the intravenous analgesia pump group( CONCLUSION Compared with intravenous analgesia pump group, ropivacaine combined with compound betamethasone can significantly reduce postoperative wound pain without increasing adverse drug reactions, and does not increase wound infection.
Adult ; Aged ; Aged, 80 and over ; Analgesia ; Anesthesia, Local ; Bunion ; Feasibility Studies ; Female ; Hallux Valgus/surgery* ; Humans ; Male ; Middle Aged ; Pain, Postoperative/drug therapy* ; Young Adult

Objective: To construct a PSA luciferase report plasmid and monitor the growth and metastasis of prostate cancer after emasculation in SCID mice. Methods: PSA promoter sequence and luciferase gene were amplified by PCR and subsequently inserted into pZsGreen1-1 vector to construct pPSA-FL-Luc vector. LNCaP cells that were stably transfected with pPSA-FL-Luc were used to establish a SCID mouse xenograft model. Then, the growth and metastasis of prostate cancer were monitored via living imaging. Results: We successfully constructed a PSA luciferase plasmid, pPSA-FL-Luc. DHT enhanced luciferase activity in a concentration-dependent manner in 293T cells with pPSA-FL-Luc transfection. Prostate cancer SCID mouse model was established with pPSA-FL-Luc transfected LNCaP cells. In tumor bearing mice with or without emasculation, pPSA-FL-Luc plasmid was applied to monitored tumor growth and metastasis based on bioluminescence imaging. Conclusions: We construct a pPSA-FL-Luc plasmid, which stably expresses luciferase and can be applied to monitor tumor development in a prostate SCID mouse model.

OBJECTIVEThe purpose of this study was to explore an objective measure to assess actual body shape of children and adolescents in China.

METHODSBased on the Chinese National Survey on Student's Constitution and Health (CNSSCH) in 2005, 210 927 children and adolescents' (7-18 years) body height, body weight, chest circumference, sitting height, chest circumference-height ratio, chest circumference-sitting height ratio, chest circumference-low limb ratio, and sitting height-low limb ratio measurements were used to develop an objective measure by using transformation variables and explored factor analysis (EFA). Discrimination power of the objective measure was evaluated based on BMI reference and Receiver Operating Characteristic curves (ROC).

RESULTSThe objective measure included four dimensions scores: transverse dimension (TD) indicating weight and chest circumference; length dimension (LD) indicating height and sitting height; transverse-length ratio dimension (TLD) indicating chest circumference-height ratio, chest circumference-sitting height and chest circumference-low limb ratio; proportion dimension (PD) indicating sitting height-low limb ratio. The whole dimension (WD) indicating the whole body shape was showed by the average of four dimensions scores. Four dimensions and WD scores were approximately 80 in children and adolescents with normal weight, and higher than those of overweight, obesity, and underweight (all P-values <0.001). Areas under ROC of overweight and obesity compared with normal weight ranged from 0.88 to 1.00 for scores of TD, TLD, and WD.

CONCLUSIONThe objective measure which included four dimensions was explored, and TD, TLD, and WD had significant discrimination power.

Asian Continental Ancestry Group ; Body Height ; Body Mass Index ; Body Size ; Body Weight ; Child ; China ; Female ; Humans ; Male