Objective To study the effects of mineral-collagen interfacial behavior on the microdamage progression within bone tissue. Methods Based on the finite element model, cohesive elements were introduced and the traction-separation law was used to simulate the role of ionic interactions, hydrogen bonds and van der waals forces. The effects of aforementioned interactions on the microdamage progression within bone were studied by the random field theory and probabilistic failure analysis. Results Strong interfaces (ionic interactions in both opening and sliding modes) between the mineral and collagen phases might encourage the formation of linear cracks in bone, whereas weak interfaces (van der Waals in opening mode and viscous shear in sliding mode) might facilitate the formation of diffuse damages. In addition, there existed a transitional interfacial bonding strength (hydrogen/van der Waals bonds) that governed the transition of microdamage accumulation from linear microcrack to diffuse damage.Conclusions The results from this study will help to understand the effects of mineral collagen interfacial behavior on microdamage accumulation in bone and further investigate the underlying mechanism of bone fracture due to osteoporosis or ageing.

OBJECTIVETo bring forward a method to improve the prominence of the forehead contour.

METHODS16 patients(age 29-53 years, female 11, male 5) were treated through a bicoronal incision. Following the incision, the forehead soft tissues are reflected down to the level of the superior orbital rims with the protection to the supraorbital neurovascular bundles. To adjust the forehead contour, both superior orbital rims and frontal bossing was reduced by burring down the excess bone or removing the anterior wall of the forehead.

RESULTSThe operative effect were satisfactory during 3-12 months of follow-up. No recurrence or osteogenesis were found in the cases. Nasofrontal angle and forehead angle were normal. The prominence of the supraorbital ridges disappeared and forehead became nature.

CONCLUSIONCranioplasty via an osteomy or burring of the outer line of forehead bone are safe, compact and effective way to improve the prominence of the superior orbital rims or frontal bossing.

Adult ; Female ; Forehead ; surgery ; Humans ; Male ; Middle Aged ; Reconstructive Surgical Procedures ; methods

OBJECTIVETo investigate the expression of oncoprotein c-erbB2 in primary breast cancer and to analyze its relation to its prognosis.

METHODSImmunohistochemical staining for c-erbB2 was performed on paraffin-embedded specimens of primary breast cancer from 284 patients, and the relation to its prognosis was statistically analyzed.

RESULTSPositive expression rate of c-erbB2 was 26.8% (76/284) in 284 primary breast cancer patients. Expression of c-erbB2 was positively correlated with the status of lymph node metastasis (P = 0.003). Univariate analysis indicated that c-erbB2 expression is a significant prognostic factor for the disease-free survival (DFS) (P = 0.024) and overall survival (OS) (P = 0.002), while multivariate analysis demonstrated that c-erbB2 is an independent prognostic factor for OS (P = 0.023). Moreover, tumors with c-erbB2 positive expression are more tend to metastasis to other viscera than those with c-erbB2 negative. c-erbB2 expression has different prognostic values for patients with different status of estrogen receptor (ER) and lymph node metastasis.

CONCLUSIONc-erbB2 expression is an independent prognostic factor for total survival time in primary breast cancer patients, and its prognostic values are different according to the different ER status and lymph node metastasis.

Adult ; Aged ; Breast Neoplasms ; metabolism ; pathology ; therapy ; Carcinoma, Ductal, Breast ; metabolism ; pathology ; therapy ; Chemotherapy, Adjuvant ; Disease-Free Survival ; Female ; Follow-Up Studies ; Humans ; Lymphatic Metastasis ; Mastectomy, Radical ; Middle Aged ; Prognosis ; Proportional Hazards Models ; Radiotherapy, Adjuvant ; Receptor, ErbB-2 ; metabolism ; Receptors, Estrogen ; metabolism ; Survival Rate

OBJECTIVETo study the expression of vascular endothelial growth factor (VEGF) and metastin in colorectal carcinoma and their association with the clinicopathological features of the malignancy.

METHODSVEGF and metastin expressions were examined immunohistochemically with SP method in 70 specimens of human colorectal carcinoma tissues and adjacent normal tissues.

RESULTSVEGF protein overexpression was detected in 48.6% (34/70)of the colorectal carcinoma tissues but in none of the adjacent normal tissues (P<0.01), and for metastin, the overexpression rate was 28.6% (20/70) in the colorectal carcinoma tissues and 70.0% (49/70) in the normal tissues (P<0.01). The expression of both VEGF and metastin was related to the histological grades, infiltration depth, TNM stage and lymph node metastasis of the tumor (P<0.01 and P<0.05, respectively).

CONCLUSIONImmunohistochemical detection of VEGF and metastin can be of value in assessment of the malignancy and in prognostic evaluation of colorectal carcinoma.

Adult ; Aged ; Colorectal Neoplasms ; genetics ; metabolism ; pathology ; Female ; Gene Expression Regulation, Neoplastic ; Humans ; Kisspeptins ; Lymphatic Metastasis ; Male ; Middle Aged ; Neoplasm Staging ; Tumor Suppressor Proteins ; genetics ; metabolism ; Vascular Endothelial Growth Factor A ; genetics ; metabolism ; Young Adult

OBJECTIVETo analyze the association of variants of hepatocyte nuclear factor-1alpha (HNF-1alpha) gene with type 2 diabetes in Chinese population.

METHODSIn 152 unrelated type 2 diabetes patients and 93 unrelated controls, eleven single nucleotide polymorphisms (SNPs) were identified and genotyped. Statistical analyses were performed to investigate whether these SNPs were associated with diabetes status in our samples.

RESULTSIn the individual SNP study, no SNP differed significantly in frequency between type 2 diabetes patients and controls. In the haplotype analysis, two haplotype blocks were identified. In haplotype block 1, no evidence was found between common HNF-1alpha haplotypes and type 2 diabetes. However, in haplotype block 2, a common haplotype GCGC formed by four tagging SNPs (tSNPs) was found to be associated with decreased risk of type 2 diabetes (odds ratio [OR] 0.6011, 95% confidence interval [CI] 0.4138-0.8732, P = 0.0073, empirical P = 0.0511, permutation test). A similar trend was also observed in the diplotype analysis, indicating that the increasing copy number of the haplotype GCGC was associated with the decreased frequency of diabetes (P = 0.0193).

CONCLUSIONThe results of this study provide evidence that the haplotype of HNF-1alpha decreases the risk of type 2 diabetes in Chinese individuals.

Adult ; Aged ; Case-Control Studies ; China ; epidemiology ; Diabetes Mellitus, Type 2 ; epidemiology ; genetics ; Genetic Predisposition to Disease ; Haplotypes ; Hepatocyte Nuclear Factor 1-alpha ; genetics ; Humans ; Middle Aged ; Polymorphism, Single Nucleotide

OBJECTIVETo explore germline mutations of MLH1 in hereditary nonpolyposis colorectal cancer (HNPCC), and to investigate the pathobiology of novel detectable mutations of MLH1.

METHODRNA was extracted from the peripheral blood of 12 patients from 12 different families fulfilling the Amsterdam II Criteria of HNPCC. Germline mutations of MLH1 were determined by RT-PCR with gene specific primers, heat-resistance reverse transcriptase and long-template PCR polymerase, followed by cDNA sequencing analysis. PCR-Genescan analysis was used to further investigate microsatellite instability with a panel of 5 microsatellite markers (BAT26, BAT25, D5S346, D2S123 and Mfd15), along with immunohistochemistry staining to detect the expression of MLH1 protein in the tumor tissues.

RESULTSFour germline mutations were found in 4 patients, 2 of which were previously reported GTT-->GAT mutation at codon 384 of exon 12, and the other two were novel mutations: CGC-->TGC at codon 217 of exon 8 and CCG-->CTG at codon 581 of exon 16. Two tumors with the novel mutations had high frequency microsatellite instability showing more than 2 instable loci (RER + phenotype), and both tumors lost their MLH1 protein expression.

CONCLUSIONThe two novel germline mutations of MLH1 identified in this study, i.e. CGC-->TGC at codon 217 of exon 8 and CCG-->CTG at codon 581 of exon 16, are very likely to have pathological significance.

Adaptor Proteins, Signal Transducing ; Carrier Proteins ; genetics ; metabolism ; Codon ; Colorectal Neoplasms, Hereditary Nonpolyposis ; genetics ; metabolism ; DNA Mutational Analysis ; DNA, Neoplasm ; genetics ; Exons ; Female ; Germ-Line Mutation ; Humans ; Male ; Microsatellite Instability ; Middle Aged ; MutL Protein Homolog 1 ; Nuclear Proteins ; genetics ; metabolism ; Phylogeny

OBJECTIVETo study the method for synthesis of 2-hydroxyl-5- butyramidobenzoic acid and test its effect on acetic acid-induced colitis in rats.

METHODS2-hydroxyl-5-butyramidobenzoic acid was synthesized from 5-aminosalicylic acid and butyric acid by amidation, esterification and hydrolization. The effect of 2-hydroxyl-5-butyramidobenzoic acid on acetic acid enema-induced colitis in rats was investigated.

RESULTSThe structure of 2-hydroxyl-5-butyramidobenzoic acid was identified by IR and 1H-NMR. After treatment with acetic acid, the colon mucosal damage index (CMDI), fecal occult blood (OB) test, and activity of myelperoxidase (MPO) increased significantly in the rats as compared to the control levels. 2-hydroxyl-5- butyramidobenzoic acid obviously reduced the CMDI and OB, and reduced the level of MPO in the rats with colitis.

CONCLUSIONThe synthesis of 2-hydroxyl-5-butyramidobenzoic acid requires only mild conditions with simple procedures, and the synthesized 2-hydroxyl-5-butyramidobenzoic acid shows obvious therapeutic effects on mucosal damage of in rats with acetic acid-induced colitis.

Acetic Acid ; Aminobenzoates ; chemical synthesis ; chemistry ; pharmacology ; therapeutic use ; Animals ; Colitis, Ulcerative ; chemically induced ; drug therapy ; Male ; Protective Agents ; chemical synthesis ; pharmacology ; therapeutic use ; Rats ; Rats, Sprague-Dawley ; Salicylates

OBJECTIVEThe purposes of this thesis were to study the behavior about workers exposed to dust and provide scientific basis for health promotion.

METHODSWe designed a questionnaire and carry it on the 746 dust workers in the 3 representative corporations of Machinery, Ceramic, and Metallurgy Industry. All data were input into computer. And a database was established with Excel. SPSS11.5 statistical analysis software was used to analyze the influence on protecting behavioral between the application of qualifications, different jobs, training or protection, and other aspects etc.

RESULTSThe rates were 94.4% and 75.3% about the regular physical examination and requirements for protective equipment. The rate of choosing an effective way of protection was generally low (15.4%). There was significant difference for among different educational background workers (P < 0.01). The rates of choosing an effective way of protection (20.3%), the regular physical examination (98.3%) and requirements for protective equipment (86.4%) in the dust workers who participated in the training of dust protection were superior than those who did not participated in the training. There was the significant difference (P < 0.05, P < 0.01). There was the significant difference for the rate of effective way of protection, regular physical examination, and requirements for protective equipment among the different corporations (P < 0.05).

CONCLUSIONSDust workers' using rate about the choosing an effective way of protection was generally low in Machinery, Ceramic, and Metallurgy Industry. Those who were not educated had a lower using rate about the protection behavior, regular physical examination, and requirements for protective equipment than those educated.

Adolescent ; Adult ; Ceramics ; Choice Behavior ; Dust ; prevention & control ; Female ; Humans ; Industry ; Male ; Metallurgy ; Middle Aged ; Occupational Exposure ; prevention & control ; Respiratory Protective Devices ; utilization ; Young Adult

BACKGROUND: Proximal humeral fracture is a common disease of fall injury in the elderly, because of bone nonunion after treatment with a variety of factors such as senile osteoporosis. Currently, the use of reverse total shoulder arthroplasty has achieved good clinical effect, but has certain limitations. OBJECTIVE: To compare and observe the clinical effects of reverse total shoulder arthroplasty and open reduction and internal plate fixation in the treatment of nonunion of proximal humeral fractures. METHODS: Totally 120 cases of nonunion of proximal humeral fractures were randomly divided into observation group and control group, with 60 cases in each group. The observation group received reverse total shoulder arthroplasty (replacement of artificial shoulder joint). The control group received open reduction and internal plate fixation. RESULTS AND CONCLUSION: (1) Follow-up results: At 3 years after surgery, the pain score was lower in the observation group than that in the control group (P < 0.05). Constant daily activities, range of activities, strength test score, Constant total score, satisfaction and hospitalization expenses were higher in the observation group than in the control group. Functions of flexion, laterotorsion and intorsion were better in the observation group than those in the control group (P < 0.05). (2) Adverse reactions: At 3 years after surgery, 26 and 22 cases had adverse reaction in the observation group and the control group respectively. (3) The results show that the clinical effect of the elders' nonunion of proximal humeral fracture treated with reverse total shoulder arthroplasty is quite good, and the pain degree and shoulder function are obviously improved. The curative effect of reverse total shoulder arthroplasty is better than that of open reduction and internal plate fixation.

OBJECTIVESTo compare the sensitivity of mammogram and breast dedicated MRI in detecting ductal carcinoma in situ with microinvaion (DCIS-MI) and ductal carcinoma in situ (DCIS) lesions, and to further investigate the independent predictive factors of mammogram and MRI sensitivity.

METHODSFrom August 2009 to November 2011, 122 consecutive confirmed breast cancer patients who had received operations were recruited for this clinical research. These patients were divided into two groups including DCIS (72 cases) and DCIS-MI (50 cases) based on pathologic reports. All the patients were female, with mean ages of 52.6 years and 54.4 years. Preoperative bilateral breast mammogram, breast dedicated MRI depictions and reports as well as histopathological reports were collected.

RESULTSSensitivity of MRI outstood mammogram in each subgroups: 84.7% vs. 42.4% in DCIS (χ(2) = 27.028, P = 0.000), 94.0% vs. 80.0% in DCIS-MI group (χ(2) = 4.540, P = 0.040). And further analysis showed that MRI was more sensitive to high nuclear grade DCIS and DCIS-MI lesions than low nuclear grade ones (OR = 3.471, P = 0.031).

RESULTSof logistic regression analysis proved microcalcification was an independent predictive factor of mammogram sensitivity (OR = 11.287, P = 0.001).

CONCLUSIONSSensitivity of breast dedicated MRI is superior to mammogram in detecting DCIS and DCIS-MI groups. Lesions with microcalcifiation is an independent predictive marker which meant that mammogram would achieve high detection rate in cancers presented calcification on mammogram image when compared with non-calcification. Diagnostic performance of breast MRI is less affected by clinical and pathological characteristics of the early stage breast cancer patients but further increased detection rate is observed in DCIS and DCIS-MI with high nuclear grade lesions which indicated that MRI could detect more early stage cancers with relative more aggression biological behaviour and provide these patients with early surgical interventions before possible progression to invasive breast cancers.

Breast Neoplasms ; diagnosis ; Calcinosis ; diagnosis ; Carcinoma, Ductal, Breast ; diagnosis ; Carcinoma, Intraductal, Noninfiltrating ; diagnosis ; Female ; Humans ; Magnetic Resonance Imaging ; Mammography ; Middle Aged ; Sensitivity and Specificity