Child ; Child, Preschool ; Humans ; Leukemia ; immunology ; prevention & control ; Vaccination

Helicobacter Infections ; complications ; Helicobacter pylori ; Hematologic Diseases ; complications ; Humans

This paper introduces the development of the MEMS at home and abroad,besides the key technology,the application in medicine and military about the MEMS also expounded in detail.

Ninety fresh umbilical cords of newborns were harvested and dissected. There were 86 cords with double arteries and single vein and 4 cords with only 1 artery and 1 vein. The outer and inner perimeter of single artery, double arteries and the vein was 3 8?0 3mm vs 6 2?0 3mm, 2 4?0 2mm vs 4 6?0 2mm and 10 0?0 4mm vs 10 8?0 4mm at empty and flatened state, respectively. The diameter of vein at 20mmHg filling pressure and single and double arteries at 80mmHg was 7 2?0 3mm, 4 8?0 1mm and 3 9?0 8mm, respectively. According to these values, various drainage and perfusion metal tubes were designed and evaluated both in vitro and in vivo. By using these tubes,extracorporeal circulation was established successfully via umbilical artery and vein in a newborn who suffered from cardiac arrest after birth. The results suggest that CPB through umbilical artery and vein is simple, practical and effective.

Child ; Child, Preschool ; Cross Infection ; epidemiology ; etiology ; Hospitals, General ; Humans ; Infant ; Infant, Newborn ; Length of Stay ; Retrospective Studies

Nanotubes, Carbon ; adverse effects ; chemistry

Objective To study the correlation between single nucleotide polymorphisms of -238,-308 G/A in promoter region of tumor necrosis factor -?(TNF-?) gene and the type of juvenile idiopathic arthritis (JIA).Methods Clinical data and blood preparation of 127 children with JIA and 106 healthy children were evaluated.Subgroups of JIA were defined according to the Edmonton criteria.The -238 G/A and -308 G/A polymorphisms in DNA analysis in this study were extracted from the whole blood.The restricted fragment length polymorphisms were determined in the cases of all JIA children and control group.Results 1.The TNF-?-238 G/A allele frequencies of JIA group and control group:allele frequency of JIA group was 92.9% and 7.1%,and the control group was 95.3% and 4.7%.The distribution of allele frequencies was no significantly different between JIA group and control group(?2=1.149 P=0.284).But there were significant difference between polyarticular JIA (RF negative) and control group(?2=7.621 P=0.006).2.The TNF-?-308 G/A allele frequencies of JIA group and control group:allele frequency of JIA group was 94.1% and 5.9%,the control group was 95.3% and 4.7%.The distributions of allele frequencies was no significantly different between JIA group and control group(?2=0.322 P=0.571).There were significantly difference between polyarticular JIA (RF negative) and control group (?2=7.621 P=0.006).Conclusions The TNF-?-238,-308 polymorphisms of A in the-238 and-308 TNF-? gene are important to the joint destruction of JIA.The study will be beneficial to provide indirect support to the application of anti-TNF drugs to the treatment of JIA.

White spot lesions (WSLs), due to enamel demineralization, occur frequently in orthodontic treatment. We recently developed a novel rechargeable dental composite containing nanoparticles of amorphous calcium phosphate (NACP) with long-term calcium (Ca) and phosphate (P) ion release and caries-inhibiting capability. The objectives of this study were to develop the first NACP-rechargeable orthodontic cement and investigate the effects of recharge duration and frequency on the efficacy oftion re-release. The rechargeable cement consisted of pyromellitic glycerol dimethacrylate (PMGDM) and ethoxylated bisphenol A dimethacrylate (EBPADMA). NACP was mixed into the resin at 40% by mass. Specimens were tested for orthodontic bracket shear bond strength (SBS) to enamel, Ca and P ion initial release, recharge and re-release. The new orthodontic cement exhibited an SBS similar to commercial orthodontic cement without CaP release (P>0.1). Specimens after one recharge treatment (e.g., 1 min immersion in recharge solution repeating three times in one day, referred to as"1 min 3 times") exhibited a substantial and continuous re-release of Ca and P ions for 14 days without further recharge. The ion re-release did not decrease with increasing the number of recharge/re-release cycles (P>0.1). The ion re-release concentrations at 14 days versus various recharge treatments were as follows:1 min 3 times>3 min 2 times>1 min 2 times>6 min 1 time>3 min 1 time>1 min 1 time. In conclusion, although previous studies have shown that NACP nanocomposite remineralized tooth lesions and inhibited caries, the present study developed the first orthodontic cement with Ca and P ion recharge and long-term release capability. This NACP-rechargeable orthodontic cement is a promising therapy to inhibit enamel demineralization and WSLs around orthodontic brackets.

OBJECTIVETo study the effects of oxymatrine (OM) on the expressions of pro-collagen I (PC I), pro-collagen II (PC III), fibronectin (FN), matrix metalloproteinase-1 (MMP-1) mRNA of fibroblasts from keloid (KFb), hyperplastic scar (HFb), and normal skin (NFb), and to compare with hydrocortisone (HC).

METHODSThe primary KFb, HFb and NFb were derived from patients and cultured in vitro using tissue block culture method. The fibroblasts were treated with 500 microg/mL OM, 2 microg/mL HC, or without any medicine (as the control). The mRNA expressions of PC I, PC III, FN, MMP-1 of the fibroblasts were detected using RT-PCR.

RESULTSUnder the normal condition, when compared with NFb, the mRNA expressions of PC I of KFb and HFb increased by 31.7% and 34.2% (both P < 0.05). Besides, the mRNA expression of PC III of KFb increased by 44.9% (P < 0.01). OM down-regulated the mRNA expressions of FN and PC I of HFb by 18.8% and 23.6% respectively (both P < 0.05). HC decreased the mRNA expressions of FN and PC I of HFb by 26.8% and 43.6% respectively (P < 0.05, P < 0.01). Meantime, OM up-regulated the mRNA expression of MMP-1 of KFb by 21.8% (P < 0.05).

CONCLUSIONSOM suppressed the synthesis of extracellular matrix (ECM) possibly through down-regulating the mRNA expressions of PC I and FN. Compared with HC, OM could promote the degradation of ECM through inducing the MMP-1 mRNA expressions of KFb. Therefore, OM could be potentially used in treatment of hypertrophic scar and keloid.

Alkaloids ; pharmacology ; Cells, Cultured ; Cicatrix ; metabolism ; pathology ; Extracellular Matrix ; metabolism ; pathology ; Fibroblasts ; drug effects ; metabolism ; pathology ; Fibronectins ; metabolism ; Humans ; Keloid ; metabolism ; pathology ; Matrix Metalloproteinase 1 ; metabolism ; Procollagen ; metabolism ; Quinolizines ; pharmacology