Objective To discuss the application of allowable total error (Tea) and allowable imprecision derived from biological variation in routine chemistry external quality assessment ( EQA) and internal quality control (IQC) and set up quality specifications of routine chemistry in our country.Methods Data of test items including K,Na,CI,Ca,P,Glu,Urea,UA,Cre,Alb,TP,TC,TG,AST,ALT,Tbil,ALP,AMY,CK,LDH,Fe,Mg,Cu,Zn and GGT was collected and evaluated by a nationwide EQA.At the same time the coefficients of variation (CVs) of these test items during the month were acquired from the IQC reports of each laboratory and then the results were analyzed.Results Percent of pass was different in these test items based on Tea derived from biological variation in EQA results.Except for items of CI,Mg,Cu and Zn,about 80％ of participant laboratories could achieve the minimum performance of biological variation.About 80％ of participant laboratories could achieve the desired performance of biological variation for K,P,Glu,Urea,UA,Cre,TC,TG,ALT,AST,Tbil,AMY,CK,LDH,Fe and GGT.About 80％ of participant laboratories could achieve the optimum performance of biological variation for Urea,UA,TC,TG,ALT,AST,Tbil,C K,and GGT.And the IQC results showed that acceptable percents of different items based on three allowable imprecision were different.More than 80％ of participant laboratories could achieve the minimum allowable imprecision for K,P,Glu,Urea,UA,TC,TG,ALT,AST,Tbil,AMY,CK,LDH,Dbil,Fe,GGT,the desirable imprecision for P,Urea,UA,TG,ALT,AST,Tbil,CK,Dbil,Fe,GGT and the optimum imprecision for TG,ALT,CK,Dbil,Fe.Conclusions The quality specifications derived from biological variation can be as evaluation criteria for EQA and IQC in order to know the detection ability of each laboratory more completely and objectively,set up quality specifications derived from allowable total error and allowable imprecision in routine chemistry and to provide basis for mutual recognition of routine chemistry test results.

The present paper is aimed to explore the origins of Proteus mirabilis (PM) whorl swarming growth phenomenon. The whorl swarming growth phenomenon of PM was observed by changed bacterial culture inoculation time, humidity, vaccination practices, cultured flat placement, magnetic field, pH and other factors. Bacterial ring spiral direction of rotation is counterclockwise and the volatile growth process of PM was whorl swarming growth phenomenon. Spiro fluctuation phenomenon was of high frequency in the sealing tanks by cultured anytime inoculation, wherever inoculation technique applied or not, the presence or absence of the magnetic field, and wherever the dish position was. The experimental results showed that the whorl swarming growth phenomenon of PM requires specific pH environment, in which the facts may be relative to its genetic characteristics and the Earths rotation.
Cell Culture Techniques ; Hydrogen-Ion Concentration ; Magnetic Fields ; Proteus mirabilis ; growth & development

Objective To investigate the effect of aldehyde-free fixation solution and aldehyde fixation solution on DNA and cytoplasm of nucleus.Methods The DNA quantification (IOD),discrete coefficient (CV),DNA index (DI) and nucleus area (area) were measured by DNA quantification system (ICM) in 8 different fixation solution;combined with cytological staining,the effects of different fixative solution on nuclear DNA and cytoplasmic staining were analyzed.Results Aldehyde fixation solution was better than aldehyde free fixation solution,the formaldehyde in fixtion solution has important influence on Feulgen-eosin staining.Conclusion Aldehyde fixation solution combined with cytological staining can obtained good dyeing effect,which provides the basis for the subsequent multi-technique joint diagnosis.

ObjectiveTo describe upper and lower limits and their sources of reference intervals in routine chemistry assays and to make a comparison between routine and dry chemistry in these aspects.MethodsThe data of reference intervals were collected,which come from the third run of 2010 External Quality Assessment (EQA) programs in routine and dry chemistry performed by National Center for Clinical Laboratories(NCCL).All data from maternal and child care service center,children's hospital and corporations were excluded.Then all the abnormal values and errors (for instance,the lower limit was higher than the upper one or the upper limit was as the same as the lower one,etc.) were eliminated,either.Data statistics was performed by SPSS 13.0 referring to upper and lower limits of reference intervals and sources of 24 routine chemistry assays ( including serum potassium and serum sodium,etc).Comparison was made between routine and dry chemistry in these aspects in 23 assays.Data from adult men were reported when gender difference was present.ResultsThe three main sources of reference intervals were National Guide to Clinical LaboratoryProcedures, instructions of reagent manufacturesanddetermined by their own laboratory.In comparison of reference intervals between routine and dry chemistry,6 assays had statistical significant difference in both upper limits and lower ones while,4 assays in one-sided limits and 13 assays were not statistically significant in both limits.Conclusions The reference intervals of routine chemistry have big differences among institutions and the sources of them are various.Only a few assays have statistical significant difference in routine and dry chemistry among medical institutions,it might be discussed in further study whether the statistical results have clinical values.In order to achieve the result agreement among clinical assays,all the laboratories must share the common reference intervals on the basis of standardization.

Adolescent ; Chondrosarcoma ; pathology ; surgery ; Douglas' Pouch ; pathology ; surgery ; Female ; Humans ; Peritoneal Neoplasms ; pathology ; surgery ; Soft Tissue Neoplasms ; pathology ; surgery

Coronary Sinus ; abnormalities ; Humans ; Male ; Middle Aged ; Subclavian Vein ; Vena Cava, Superior

OBJECTIVETo observe the clinical effect of electric stimulation of long-term retaining needle on analgesia after laparoscopic cholecystectomy (LC) and the impacts on the post-surgical flatus time.

METHODSUnder static absorptive composite general anesthesia, 90 cases of LC were randomized into three groups, 30 cases in each one. In the control group, the analgesia was not applied after LC. In the analgesia-pumper group, the patient controlled intravenous analgesia (PCIA) was used. In the needle-retaining group, the electric acupuncture stimulator was used. The needles were inserted transversely at Riyue (GB 24), Qichong (ST 30) and Yanglingquan (GB 34) and fixed with sterile sticker. Separately, in 8 h and 24 h after surgery, the electric acupuncture stimulation with disperse-dense wave, 2 Hz/100 Hz frequency was applied continuously for 30 min. Visual analogue scale (VAS), adverse reactions such as vomiting and nausea and the postoperative flatus time in 2, 4, 8, 12, 24 and 36 h after surgery were observed and recorded in the three groups.

RESULTSIn 2, 4, 8, 12 and 24 h after surgery, VAS scores in the needle-retaining group and the analgesia-pumper group were all lower than those in the control group (P < 0.05, P < 0.01). The analgesia effect at the above time points in the needle-retaining group was better than that in the analgesia-pumper group (all P < 0.05). There was not adverse reaction in the needle-retaining group. But there were 3 cases of somnolence, 6 cases of nausea and 3 cases of vomiting in the analgesia-pumper group, and 2 cases of nausea and 1 case of vomiting in the control group. The flatus time was quite earlier in the needle-retaining group as compared with the other two groups [(14.77 +/- 4.99) h vs (18.50 +/- 4.22) h, P < 0.01; (14.77 +/- 4.99) h vs (18.17 +/- 4.69) h, P < 0.05].

CONCLUSIONThe electric stimulation of long-term retaining needle is safe and effective in analgesia after LC. It avoids the adverse reactions of analgesics and promotes postoperative flatus.

Acupuncture Analgesia ; instrumentation ; Adult ; Aged ; Cholecystectomy, Laparoscopic ; adverse effects ; Electroacupuncture ; instrumentation ; Female ; Humans ; Male ; Middle Aged ; Pain Management ; Pain, Postoperative ; etiology ; therapy

Fibroblast growth factor 21 (FGF21) is a member of FGF family. It has been demonstrated that FGF21 is an independent, safe and effective regulator of blood glucose levels in vivo. In order to improve the activity of FGF21, we exchanged the beta10-beta12 domain of the human FGF21 with that of the mouse FGF21 to construct a novel FGF21 gene (named hmFGF21), and then subcloned hmFGF21 gene into the SUMO expression vector to create pSUMO-hmFGF21 and transformed it into E. coli Rosetta for expression of the fusion protein SUMO-hmFGF21. Both in vitro and in vivo glucose regulation activity of hmFGF21 was evaluated. The SDS-PAGE result showed that compared with wild-type hFGF21, the soluble expression of hmFGF21 increased about 2-fold. HmFGF21 was more potent in stimulation of glucose uptake in HepG2 cells in vitro. The results of anti-diabetic effect on db/db mice demonstrated that hmFGF21 had better efficacy on controlling the blood glucose of the db/db diabetic animals than wild-type hFGF21. These results suggest that the biological properties of FGF21 are significantly improved by optimization.

OBJECTIVETo investigate the underlying mechanism of the protective effects of resveratrol on oxidant-induced mitochondrial damage in embryonic rat cardiomyocytes.

METHODSH9c2 cells, a permanent cell line derived from embryonic rat cardiac tissue, and then randomly divided into control group [PBS, cells exposed to H2O2 (600 µmol/L) for 20 min to induce mitochondrial oxidant damage], resveratrol group (0.01, 0.1, 1, 5, 10 and 20 µmol/L for 20 min at 20 min before exposing to H2O2), resveratrol plus inhibitor group (1 µmol/L KT5823 for 10 min at 10 min before 5 µmol/L resveratrol treatment) and inhibitor group (1 µmol/L KT5823 for 10 min). Mitochondrial membrane potential (ΔΨm) was measured by staining cells with tetramethylrhodamine ethyl ester (TMRE) and the mitochondrial permeability transition pore (mPTP) opening was evaluated by measuring the decrease of TMRE fluorescence intensity. Immunofluorescence assay was used to observe GSK-3β phosphorylation. The phosphorylation of GSK-3β and VASP were determined by Western blot. To detect intracellular NO, cells were loaded with DAF-FM DA (specific fluorescent dye of NO) and imaged with confocal microscopy.

RESULTSCompared to the control group, resveratrol (0.01-5 µmol/L) attenuated H2O2-induced mitochondrial damage reflected by attenuating the H2O2-induced TMRE fluorescence intensity decrease in a dose-dependent manner and the efficacy of 10 and 20 µmol/L resveratrol was significantly lower than that of 5 µmol/L resveratrol. Resveratrol also significantly upregulated the protein expression of VASP and increased GSK-3β Ser(9) phosphorylation, which could lead the inactivation of GSK-3β. These effects of resveratrol could be significantly abolished by protein kinase G inhibitor KT5823, while KT5823 alone did not affect GSK-3β and VASP phosphorylation. Confocal microscopy showed that DAF-FM (specific NO indicator) was similar between resveratrol and control group, suggesting that resveratrol did not produce NO.

CONCLUSIONSResveratrol could attenuate oxidant-induced mitochondrial damage in embryonic rat cardiomyocytes by inactivating GSK-3β via cGMP/PKG signaling pathway independent of NO-related mechanism.

Animals ; Carbazoles ; pharmacology ; Cell Line ; Cyclic GMP ; metabolism ; Cyclic GMP-Dependent Protein Kinases ; metabolism ; Glycogen Synthase Kinase 3 ; metabolism ; Glycogen Synthase Kinase 3 beta ; Hydrogen Peroxide ; metabolism ; Mitochondria, Heart ; drug effects ; metabolism ; Myocytes, Cardiac ; cytology ; drug effects ; Oxidants ; metabolism ; Rats ; Signal Transduction ; drug effects ; Stilbenes ; pharmacology

Decoction is one of the most commonly used dosage forms of traditional Chinese medicine. The stability of chemical constituents in decoction is closely related to the clinical efficacy and safety. There were few reports about the influence of metal ions in the stability of chemical constituents in traditional Chinese medicine. However, there is no evidence that metal ions in decoction water need to be controlled. In this study, 2,3,5,4'-tetrahydroxy stilbene-2-O-β-D-glucoside (THSG), one of the main constituents in Polygoni Multiflori Radix was studied. Ordinary tap water, deionized water, and water containing different metal ions were used to investigate and compare the influence on THSG. The results showed that after storage in a dark place at the room temperature for 10 days, the degradation of THSG was 7% in deionized water, while undetectable in tap water. The content of THSG could be decreased by different kinds of metal ions, and the effect was concentration-dependent. Moreover, Fe3+ and Fe2+ showed the greatest influence at the same concentration; and our study has shown that THSG decreased more than 98% in Fe and Fe2+ solutions at 500 ppm concentration. In the same time we found out p-hydroxybenzaldehyde (molecular weight: 122.036 7) and 2,3,5-trihydroxybenzaldehyde-2-O-glycoside (molecular weight: 316.079 4) were the main degradation products of THSG in tap water and water containing Cu2+, Ca2+, Zn2+, Mg2+ and Al3+. The product of THSG dimer with a water molecule was found in water containing Fe3+ and Fe2+. The above results showed that the metal ions in water could significantly influence the stability of THSG in water, indicating that the clinical efficacy and safety of decoction would be affected if the metal ions in water were not under control. It's suggested that deionized water should be used in the preparation of decoction containing Polygoni Multiflori Radix in the clinic to avoid degradation of THSG. Meanwhile, decoction prepared by tap water should be taken by patients in a short time. Our investigation provides important information and reference about the influence of metal ions on the stability of decoctions in other traditional Chinese medicine that have unstable groups such as hydroxyls and unsaturated bonds, etc.
Drugs, Chinese Herbal ; chemistry ; Glucosides ; chemistry ; Ions ; chemistry ; Metals ; chemistry ; Plant Roots ; chemistry ; Polygonaceae ; chemistry ; Stilbenes ; chemistry