Thiols, which are components of many proteins and simple molecules, play an important role in the cellular antioxidant defense system. The quantitative determination of thiols is important in biochemistry and clinical chemistry. Fluorescent probes, which have its apparent advantages in sensitivity and, most importantly, in imaging thiols in vivo, even in single living cells, appear to be particularly attractive. In this review, we classify the fluorescent probes based on their different reaction mechanisms with thiols and summarize the recent progresses of thiols fluorescent probes with fifty-one

Objective To evaluate the feasibility of optimized scan protocol in whole-brain perfusion imaging with 320-MDCT scanner.Methods Twenty healthy volunteers were randomly divided into control group (13 patients) and test group (7 patients).The standard perfusion scan protocol (collecting 19 volumes)was applied in control group.The optimized perfusion CT scan protocol(collecting ll volumes)formulated by reducing scanning phases reasonably and changing the collection intervals was applied in test group.The regions of interest(ROI) with area of(20 ± 2)mm2 were located in the bilateral frontal white matter,parietal white matter,centrum semiovate,basal ganglia,occipital lobe and cerebellum.Bilateral perfusion values from ROI were measured,including cerebral blood volume(CBV),mean transit time (TTP),cerebral blood flow (CBF),mean transit time (MTT) and delay time (DT).Results Dose length product (DLP)and effective dose (ED)in optimized protocol were decreased 42.02％ as compared to control group.Every relative perfusion value of both sides from both groups were not statistically significant (P ＞ 0.05).Every relative perfusion parameters from individual territory in both groups showed no significant differences (P ＞ 0.05).Conclusions Using the optimized scan protocol,we could obtain the same whole-brain perfusion values could be obtained with the default standard protocol and less radiation dose.

Objective To investigate the difference of clinical efficiency and safety in obsessive-compulsive disorders (OCD) treatment with escitalopram or paroxetine.Methods A total of 156 OCD patients were randomly divided into escitalopram group (ESC group) and paroxetine group (PAR group).Yale-Brown Obsessive Compulsive Scale (Y-BOCS),Hamilton Depression Scale (HAMD) and Treatment Emergent Symptom Scale (TESS)were used to evaluate the clinical efficiency and safety before and after1,2,4,6,8 weeks treatment.Results The cure rate(21.79％ vs 17.95％) and effective rate(70.51％ vs 71.79％) had no statistically difference between ESC group and PAR group,and incidence of side effect had no significant difference between two groups(x2 =1.99,P＞0.05).Compared with the group before treatment,HAMD scores were significantly decreased from the first weekend in ESC group,but in PAR group HAMD scores did not decrease until the second weekend,and the differences were also significant(P＜0.05).Conclusion Escitalopram is a safety,effective and well-tolerated drug in the treatment of obsessive-compulsive disorder.

Objective:To investigate the effect of steroid hormones on distribution of uterine natural killer(uNK)cells in the mouse uterus.Methods:A unique uNK cell marker, Dolichos biflorus agglutinin(DBA)lectin was used to localize uNK cells in the ovariectomized and ovarian steroid hormone-treated mouse uterus by immunohistochemical staining.Results: After estrogen(E_2)was administered in the ovariectomized mice, uNK cells were distributed in the stroma of uterine mesometrial pole,as round, immature and small lymphocyte-like cells.With the progesterone(P_4)administered, the immunostaining results showed that DAB-lectin staining were mainly distributed in the vascular endothelial cells.With the combination of E_2 and P_4, DAB-lectin staining was distributed in the matrix of the uterus,seen as a number of small round uNK cells or some as vascular endothelial cells.The effects could be completely abolished by specific antagonists of their nuclear receptors(estrogen and progesterone receptor).Conclusion: The distribution of uNK cells in mouse uteri is collaboratively regulated by estrogen and progesterone.The endometrial uNK cells may be involved in the mechanism of the fetal protective immune reaction during pregnancy.

Objective This study was to evaluate the safety of 640 corneal donors by analysing the serological testing results.Methods We retrospectively analyzed the serological testing results from Changsha Aier Eye Bank and Chengdu Kangqiao Aier Eye Bank from January 2011 to December 2015,hepatitis B virus surface antigen (HBsAg),hepatitis C virus (HCV),treponema pallidum (TP) and human immunodeficiency virus (HIV) were detected by colloidal gold or enzyme-linked immunosorbent assay (ELISA).Results There were 83 out of 640 serum samples showed positive immuno-reaction assayed markers,the positive rate was 12.97％,including HBsAg(n=60,9.38％),HCV(n=3,0.47％),TP(n=11,1.72％) and HIV(n=2,0.31％).Moreover,3 corneal donors were both positive against HBsAg and HCV,2 donors positive against HCV and TP,1 donor positive against HBsAg and HIV,1 donor positive against HBsAg and TP.Conclusions There is a high proportion of positive results of blood-borne diseases in cornea donors,which is a potential threat to corneal receptors and eye bank workers.Therefore,it is very important to detect serological test strictly for corneal donors.

Objective To explore the optimal experiment conditions of CCK-8 and MTS for cell proliferation assays in human amniotic epithelial cells and to evaluate the cytotoxicity of these reagents. Methods Human amniotic epithelial cells (hAECs) in logarithm growth stages were prepared in different cell concentrations with DMEM/F12 and 10% FBS. The sensitivity and optimal wavelengths was determined based on the optical density (OD) measured at 450 nm and 492 nm. The optimal time was determined under the conditions of the same cell concentration and defined OD values. HAECs were treated with DMSO, CCK-8 and MTS for 1 h, 2 h, 3 h, and 4 h, respectively. 24 h later, cytotoxicity of the CCK-8 and MTS was evaluated by determination of cell proliferation and Trypan Blue staining. Results The optimal detection wavelength was 450 nm for CCK-8, and 492 nm for MTS. The sensitivity of CCK-8 was slightly lower then that of MTS. The optimal time for incubation hAECs with CCK-8 was 4 h within 1~4 h. The inhibitory on cell proliferation and cytotoxicity of CCK-8 were weaker then those of MTS. Conclusion CCK-8 is a convenient reagent with low cytotoxicity for detection of the proliferation of hAECs.

Objective To explore the main factors affecting the MV imager projection offset in the machine performance check(MPC)for Varian Vital Beam linear accelerator.Methods The MV imager projection offsets in the MPC after repairing the MV imaging arm encoder of shoulder motor,locking the treatment couch,and isocenter calibration were analyzed.Results MPC results revealed that the MV imager projection offset after repairing the MV imaging arm encoder of shoulder motor was(0.310±0.001)mm,significantly less than(0.450±0.010)mm in the blank group.The difference in MV imager projection offset between the isocenter calibration group and the blank group was trivial.The MV imager projection offset after locking the treatment couch was(0.240±0.030)mm,significantly less than(0.450±0.010)mm in the blank group.When MPC was carried out after repairing the imaging arm encoder and performing isocenter calibration,there was no significant statistical difference in MV imager center offset between the locked and unlocked treatment couch.Conclusion The damage of MV imaging arm encoder of shoulder motor is the main factor causing abnormal MV imager projection offsets.Locking the treatment couch before the MV imaging center check can reduce the results,but it cannot eliminate the MV imager projection offset.