Objective To determine the fitting parameters for the Archer equation (using shielding transmission factor as variables and shielding material thickness as functions) and quadratic equation with one unknown (using lead equivalent as variables and shielding material thickness as functions) for common radiation protection shielding materials, enabling calculation of lead equivalent or required shielding material thickness. Methods The shielding transmission factor of red brick, lime-sand brick, barium sulfate protective coating, lead glass, and standard lead sheets was measured under narrow-beam X-ray exposure, with tube voltages ranging from 70 to 150 kV. The data of standard lead sheet was used as the reference for lead equivalent. Related parameters were fitted according to the Archer equation recommended by the National Council on Radiation Protection and Measurements Report No. 147 and quadratic equation with one unknown relating lead equivalence to shielding materials thickness. Results The coefficients of determination for the quadratic equation with one unknown of red brick, lime-sand brick, barium sulfate coating, lead glass exceeded 0.999 3. Under 120 kV X-rays, 1 and 2 mmPb were equivalent to 101.02 and 171.09 mm red brick, 121.21 and 204.43 mm lime-sand brick, 10.63 and 24.27 mm barium sulfate coating, and 4.21 and 9.39 mm lead glass. Conclusion The Archer equation and quadratic equation with one unknown from 120 kV or higher tube voltage conditions derived in this study can be applied to calculate lead equivalent or required thickness of shielding materials under both primary and scattered radiation, without linear extrapolation. They provide a basis for radiation shielding design in radiation diagnosis and treatment facilities and for occupational radiation hazard assessments.

OBJECTIVE: To investigate the effect of SRC kinase inhibitor PP2 on the invasion and metastasis of lung cancer A549 cells and explore its molecular mechanism. METHODS: MTT assay was used to evaluate the inhibitory effect of PP2 on the proliferation of A549 cells. Cell scratch and Transwell assays were performed to assess the invasion and metastatic capacity of A549 cells after treatment with 1, 2, 4, 8, and 16 μmol/L PP2 for 24 h. Western blotting was used to detect the expressions of connexin43 (Cx43) and MMP-2 in the cells after small interfering RNA (siRNA)-mediated silencing or overexpression of Cx43; the changes in the cell invasion and metastasis in response to PP2 treatment after Cx43 silencing or overexpression were investigated. RESULTS: MTT assay showed that treatment with PP2 at 2, 4, 8, 16, and 32 μmol/L significantly inhibited the proliferation of A549 cells in a concentration-dependent manner. Treatments with PP2 at 1, 2, 4, 8, and 16 μmol/L for 24 h also concentration-dependently lowered the invasion and metastatic abilities of the cells ( < 0.05). At 4 and 8 μmol/L, PP2 significantly increased the expression level of Cx43 protein and decreased the expression level of MMP-2 protein. Overexpression of Cx43 significantly enhanced the inhibitory effect of PP2 on the cell invasion and metastasis, and Cx43 silencing significantly attenuated the inhibitory effect of PP2 ( < 0.05). CONCLUSIONS PP2 treatment can suppress the invasion and metastasis of A549 cells possibly by modulating the expression of Cx43.
A549 Cells ; Cell Line, Tumor ; Cell Movement ; Cell Proliferation ; Connexin 43 ; Humans ; Lung Neoplasms ; Neoplasm Invasiveness ; Protein Kinase Inhibitors ; src-Family Kinases

Objective To explore the prevalence and related factors of female sexual dysfunction(FSD) in women with diabetic.Methods Female Sexual Function Index(FSFI) was used to investigate the prevalence of FSD in 336 women with diabetes.Logistic analysis was conducted between diabetic women with FSD and without FsD for related factom of diabetic FSD.Results Two hundred and fourty-four patients were found to have FSD.The prevalence was 72.6% .The Logistic analysis showed that FSD was significantly relaed to diahetic course and diabetic neuropathy.Conclusion The prevalence of FSD in diabetic women is significandy greater than non-diabetic women.Diabetic course and diabetic neuropathy play an important role in the development of FSD in diabetic women.