A theoretical model for the magnetic forces on ferromagnetic drug particles in a guiding magnetic field is established with the consideration of the electromagnetic field theory. Our model shows that the ferromagnetic drug particles can concentrate on the targeted area with the guidance of the outside magnetic field. Both the distribution of the intensity of the guiding magnetic field and the forces on ferromagnetic drug particles are studied numerically. The theoretical results are in good agreement with the experimental results reported recently.

Objective To investigate the body burden of lead and the related health effects in the residents living on the highway-sides of the mountain areas in Fujian province,China.Methods Eighty-nine subjects living nearby the highway-sides(exposed group) and 69 subjects far away from the highway(control group) were recruited by stratified random sampling method.Their basic situation and relevant index were investigated with questionnaire;The lead levels of blood and urine were determined by graphite furnace atomic absorption spectrometric method and compared;The temperature,pulse rate and blood pressure were taken to analyze the related health effects;and the influence factors of blood lead levels were analyzed by single factor analysis method,rank correlation analysis method and multiple regression analysis method.Results The blood and urine lead level of exposure group([94.19 26.51),(15.36?7.67)?g/L ]were significantly higher than that of the control group[(62.83?13.33),(7.24?4.62) ?g/L;t=8.981 0、7.766 2,P

Objective To know the blood level and the influencing factors for the children living in the area near highway in the mountain region. Methods From December,2006 to April,2007,one hundred and eighteen children aged 8-12 years (exposed group) living in the area near highway in the mountain region and fifty-one children aged 8-12 years (control group) living in the area far away from the highway were selected by random cluster sampling. Lead level of the soil and crops on the highway-sides (pollution area)and the area far away from the highway (control area) was determined. The basic situation was investigated by the questionnaire, the blood lead level was determined by graphite furnace atomic absorption spectrometry. The influence of lead on children's intelligence, physical growth and the influencing factors for blood lead level were analyzed. Results The average lead level of the soil [(96.89?15.05) mg/kg] and crops [(0.86?0.29) mg/kg] in the polluted area was significantly higher compared with the control [soil lead: (29.83?1.41)mg/kg,crops lead:(0.17?0.03) mg/kg], and revealed statistical significance respectively (P

Objective To observe the effect ofDanhuai-Yinxie condensed pill on the expression of VEGF and its receptors in the model rabbits with psoriasis.Methods Fourty-two healthy Japanese white rabbits were randomly divided into the control group, the model group, the Acitretin group, and the low-, medium- and high-doses ofDanhuai-Yinxie condensed pill groups. The backs of rabbits’ ears were wiped with 5% propranolol for 4 weeks in the latter four groups, while with saline for the same period in the control group. The rabbits in the Acitretin group were intragastric administrated with 1% Acitretin one day since the models of psoriasis were successed, while the rabbits in the low-, medium- and high-doses ofDanhuai-Yinxie condensed pill groups were intragastric administrated withDanhuai-Yinxie suspension 20, 40, 80 mg/kg daily, respectively. The rabbits in the control and model groups were intragastric administrated with equal-volume saline daily. The expression of VEGF, its receptor 1 (FLT-1) and receptor 2 (KDR) were detected by ELISA method, and the expression of VEGF mRNA was detected by PCR method, dermal papillary vascular density (MVD) and the T lymphocytes proliferation from peripheral blood were detected.Results The expression of VEGF (114.43 ± 952 ng/ml, 109.65 ± 9.15 ng/mlvs. 179.90 ± 11.30 ng/ml), VEGF mRNA (0.83 ± 0.07, 0.80 ± 0.06vs. 2.74 ±  0.15), FLT-1 (4.54 ± 0.26 ng/ml, 4.16 ± 0.24 ng/mlvs. 6.92 ± 0.38 ng/ml), KDR (2.48 ± 0.16 ng/ml, 2.51 ± 0.19 ng/mlvs. 6.79 ± 0.27 ng/ml), MVD (10.12 ± 1.97, 9.83 ± 1.12vs. 16.45 ± 2.05) and T lymphocytes proliferation (87.35% ± 6.29%, 86.21% ± 6.42%vs. 123.74% ± 9.18%) in the medium- and the high-dose groups significant decreased than those in the model group (P<0.05).ConclusionDanhuai-Yinxiecondensed pill could reduce the expression of VEGF, block the binding of VEGF to its receptors, inhibit angiogenesis, inhibit the reconstruction of subcutaneous tissues, reduce the dysplasia of dermal microvessels, and inhibit the proliferation of T cells.

Adult ; Air Pollutants, Occupational ; poisoning ; Humans ; Male ; Middle Aged ; Occupational Diseases ; etiology ; Occupational Exposure ; adverse effects ; Pneumoconiosis ; etiology ; Silicon Dioxide ; poisoning

Adolescent ; Child ; Child, Preschool ; Female ; Humans ; Infant ; Lymphoma, Non-Hodgkin ; diagnosis ; pathology ; therapy ; Male ; Prognosis ; Retrospective Studies

This paper introduces the control system design of the medical oxygen generator in the field trailer.Based on a series of experiments,the results prove that the control system can meet the purpose of the design and can fulfill the need of the equipment.

Objective:To investigate the number and distribution of macrophages (Mφ) and natural killer(NK) cells in hepatocellular carcinoma (HCC), paraneoplastic,cirrhosis and normal liver tissues and their relationship with the prognosis of HCC patients.　Methods:Surgical specimens from 60 cases of HCC, 62 cases of cirrhosis and 23 cases of normal liver tissues were investigated by immunohistochemical staining of CD68 and CD57 with a streptavidin-horseradish peroxidase detective system.The correlation of the number of Mφ and NK cells in different tissues with the clinical tumor parameters was also studied.　Results:①The order of the number of Mφ from the highest to the lowest was:paraneoplastic,cirrhosis, normal, HCC(P<0.05)；and the number of NK cells from the highest to the lowest was:HCC, paraneoplastic, normal, cirrhosis(P<0.05).②The number of Mφ decreased successively with the decrease of the HCC differentiation(P<0.05)；There was no relationship between the number of NK cells in HCC and histological grade. ③There was no relationship between the number of Mφ in HCC and clinical TNM stage ；The number of NK cells in HCC had degressive tendency with the clinical TNM stage(P<0.05). ④The number of Mφ and NK cells in HCC in the cases with metastasis in 15 months was significantly lower than that without metastasis(P<0.05, 0.01）.⑤There was a linear positive correlation between the number of Mφ and NK cells in HCC (r＝0.344, P<0.05).　Conclusion:The number of Mφ and NK cells in HCC in the cases with metastasis is significantly lower than that without metastasis；The number of Mφ has a close correlation with the HCC differentiation, and positive correlation with the number of NK cells；The number of Mφ and NK cells might be important markers to estimate the immune status and useful factors to predict the prognosis of HCC patients.

Objective:To investigate the number of CD+68 cells in hepatocellular carcinoma (HCC),paraneoplastic tissues,cirrhosis tissues and normal liver tissues and their clinical significance.Methods:Surgical specimens from 60 cases of HCC,62 cases of cirrhosis and 23 cases of normal liver were investigated by immunohistochemical staining of CD+68with streptavidin-horseradish peroxidase detective system.Results:(1)The order of the mean number of CD+68cells in the tissues from the highest to the lowest was:paraneoplastic,cirrhosis,normal liver and HCC tissues(P〈0.01);(2)The number of CD+68cells in the tissues decreased successively with the decrease of HCC differentiation (P〈0.05);(3)There was no relationship between the number of CD+68cells in HCC and its clinical TNM stage;(4)The number of CD+68cells in the cases with metastasis within 15 months was significantly lower than that without metastasis (P〈0.05).Conclusion:The number of CD+68cells might be an important marker to estimate the immune status and a useful factor to predict the prognosis of HCC patients.

Anemia, Dyserythropoietic, Congenital ; pathology ; Child ; Humans ; Male ; Siblings