Objective To evaluate the inverse distance weighted(IDW) in revealing the characteristics of spatial distribution of water fluoride in Heze City,Shandong Province.Methods A geographic information system (GIS) database of water fluoride was established in Heze City of Shandong Province using the data of endemic fluorosis surveys collected by Endemic Disease Prevention Institute in Shandong Province during 2005-2007.IDW spatial interpolation was applied to predict the distribution of fluoride in drinking water in 139 towns of Heze City.Sensitivity and specificity were calculated.Results Mean water fluoride levels in 10 counties of Heze City were all higher than 1.0 mg,/L,and the water fluoride in Cao County,Juye,Mudan District and Juancheng were higher than 2.0 mg/L.Of all 139 townships of Heze City,129 were higher fluoride townships where fluoride was ＞ 1.0 mg/L,10 were lower fluoride townships(≤ 1.0 mg/L).IDW spatial interpolation showed that the water fluoride of most areas in Heze City were ＞ 1.0-2.0 mg/L.The areas with water fluoride of ＞ 2.0-3.0 mg/L were mainly located in eastern Juancheng,northern Mudan District,north-central Chengwu,central and southern Juye,southeastern part of Caoxian and eastern part of Shan Town.Regions of water fluoride ＞ 3.0 mg/L were mainly distributed in Xieji and Wanfeng towns of Juye County,Jishan town of Juancheng County,Sunlaojia town of Caoxian and Dusi town of Mudan County.The internal verification results showed that the sensitivity,specificity and overall accuracy rate of IDW used for predicting water fluoride content was 100.00％ (129/129),10.00％ (1/10) and 93.53％ (130/139),respectively.While the external verification results showed that the sensitivity,specificity and overall accuracy rate of IDW for predicting water fluoride content was 100.00％(31/31),11.11％(1/9) and 80.00％(32/40),respectively.Conclusion With the application of IDW interpolation,it is feasible to infer the overall spatial distribution based on the monitoring data,and to reveal the spatial characteristics of water fluoride in Heze City,Shandong Province.

Chemical investigatation of Drosera peltata var. multisepala led to the isolation of eleven compounds using various chromatographic techniques. The structures of these compounds were elucidated as isoshinanolone-4-O-beta-D-glucoside (1), isoshinanolone (2), epi-isoshinanolone (3), plumbagin (4), droserone (5), droserone-5-O-glucoside (6), quercetin (7), kaempferol (8) , gossypetin-8-O-glucoside (9), 3,3'-dimethoxy ellagic acid (10), and ellagic acid (11) by their physicochemical properties and spectral data analysis. Compound 1 was a new compound. Compounds 3, 8, 10, and 11 were isolated from this plant for the first time.
Chromatography, Liquid ; methods ; Drosera ; chemistry ; Drugs, Chinese Herbal ; chemistry ; Ellagic Acid ; analogs & derivatives ; analysis ; isolation & purification ; Glucosides ; analysis ; isolation & purification ; Kaempferols ; analysis ; isolation & purification ; Magnetic Resonance Spectroscopy ; methods ; Molecular Structure ; Naphthoquinones ; analysis ; isolation & purification ; Plant Extracts ; analysis ; isolation & purification ; Quercetin ; analysis ; isolation & purification ; Spectrometry, Mass, Electrospray Ionization ; methods ; Tetrahydronaphthalenes ; analysis ; isolation & purification

OBJECTIVE: In order to explore the effect of plasma radiofrequency ablation on nasal mucosa provocative tests for allergic rhinitis. METHOD: Eighty patients with allergic rhinitis were enrolled in this study. The nasal mucosa provocative tests and nasal airway resistance and subjective nasal patency feeling were studied before and after plasma radiofrequency ablation treatment. The correlation of subjective and objective nasal patency was evaluated. RESULT: The preoperative nasal mucosa provocative test of all the patients allergic to mites were positive. The nasal mucosa provocative tests were negative within 72 patients, while remained positive in eight patients after 3 months of operation. The nasal airway resistance decreased from (0.772 +/- 0.224) kPa x s/L to (0.221 +/- 0.112) kPa x s/L after surgery (P < 0.01); Visual analog scale decreased from 7.0 +/- 2.0 to 2.5 +/- 1.5 after 3 months of operation (P < 0.01). CONCLUSION Due to its ability to reduce the sensitivity of the nasal mucosa, nasal airway resistance and improve subjective feeling of nasal patency, plasma radiofrequency ablation is effective for the treatment of patients with allergic rhinitis.
Adolescent ; Adult ; Airway Resistance ; Catheter Ablation ; Female ; Humans ; Male ; Middle Aged ; Nasal Mucosa ; Nasal Provocation Tests ; Rhinitis, Allergic ; Rhinitis, Allergic, Perennial ; diagnosis ; surgery ; Young Adult

OBJECTIVE: To determine whether or not the bacterial DNA which was detected by PCR comes from viable bacteria. METHOD: Observing the affection of middle ear effusion (MEE) on DNA viscosity and enzymatic digestion of DNA. RESULT: The middle ear effusion and DNA are stable and DNase 1 rapidly digests DNA. The effusion does not seem to degrade DNA. The middle ear effusion signficantly inhibits DNase 1. CONCLUSION Middle ear effusion provides an inhibition of the enzymatic digestion of purified DNA. Thus any DNA found in effusion by PCR techniques could well be fossilized remains and chronic otitis media with effusion may not be the bacterial infection.
Adolescent ; Bodily Secretions ; Child ; Child, Preschool ; Chronic Disease ; DNA, Bacterial ; chemistry ; Deoxyribonucleases ; antagonists & inhibitors ; Ear, Middle ; enzymology ; Female ; Humans ; Male ; Otitis Media with Effusion ; enzymology ; Viscosity