Objective To establish a simultaneous detection approach for 34 emerging contaminants(ECs)in tap water by liquid chromatography-tandem mass spectrometry(HPLC-MS/MS).Human health risk assessment was performed according to the detection results from 43 tap water samples.Methods Tap water samples were concentrated and extracted by solid phase extraction,and then blown to near dry by nitrogen at 40℃.The sample extracts were dissolved in methanol-water solution(95:5,VN)to 0.5 mL for analyzing.Agilent Jet Stream Electrospray Ionization(AJS ESI)and the multiple reaction monitoring(MRM)mode were performed for MS to acquire the data of 34 ECs.A database including precursor ion,product ion and retention times was established accordingly.Results The average linear correlation coefficients(r)of 34 kinds of ECs was 0.995 9.The limits of detection were 0.01～0.60 ng/L and the recoveries were between 60.7％and 119.8％.The intra-group precisions were between 0.05％～9.89％and the intra-day precisions were between 0.20％～14.40％for the spiked samples.The method was applied to analyze 43 tap water samples and a total of 15 ECs were detected.According to the results,the detection rate of caffeine was the highest(84％),and the concentration range was ND～74.42 ng/L.Among all the ECs detected,1,2,3-benzotriazole had the highest concentration(ND～361.15 ng/L),where detection rate was 44％.Humans may be exposed to these ECs by drinking the tap water.The human health risk assessments of 12 kinds of ECs were carried out,however,the estimated risk was negligible(risk quotient＜0.01).Conclusion The method is simple,highly sensitive and selective,and could meet the detection needs of ECs at trace level in tap water.There was no human health risk posed for ECs identified in 43 tap water samples analyzed by this method.

Objective:To understand the molecular characteristics of the mutant strain of polymerase basic protein 2 (PB2) gene of influenza A (H1N1pdm) in Guangdong province, and to explore its specific molecular sites, so as to provide scientific basis for the prevention and control of influenza virus.Methods:Throat swab samples were collected from 2 cases infected with PB2 gene variant strains for virus isolation, and 23 influenza virus strains were selected from Guangdong province for sequencing analysis. The reference sequences and vaccine strain sequences provided by GISAID were used to perform evolutionary analysis on hemagglutinin (HA) and PB2 genes. Virus strain antigen analysis and neuraminidase (NA) inhibition test were carried out. PB2 protein model was constructed and polymerase activity was analyzed.Results:H399N amino acid mutation occurred in the HA gene of PB2-D701N and PB2-A271S variant strains, both of which belonged to the branch of 6B.1A.5a.2a. They belonged to the same big branch and different small branches as the vaccine strain A/Victoria/4897/2022, and they are all vaccine-like strains. In the three-dimensional structure, the mutations of PB2-D701N and PB2-A271S change charge and hydrophobicity.Conclusions:PB2-D701 and A271 were highly conserved, and PB2 mutant strains were not the dominant strains. The PB2 mutant had high antigenicity with the vaccine. The PB2 mutant strain is sensitive to NA inhibitors. The three-dimensional model predicted that PB2-D701N mutation could enhance virulence and affect transmissibility of influenza virus, while PB2-A271S mutation could affect polymerase activity and polymerase complex synthesis of influenza virus.

Objective To explore the therapeutic effect of transdermal patches containing Cassia seed extract applied at the navel on slow transit constipation (STC) in rats and explore the spectrum-effect relationship of the patches. Method In a STC rat model established by gavage of compound diphenoxylate suspension for 14 days, the transdermal patches containing low, medium and high doses of Cassia seed extract (41.75, 125.25, and 375.75 mg/kg, respectively) were applied at the Shenque acupoint on the abdomen for 14 days after modeling, with constipation patches (13.33 mg/kg) as the positive control. After the treatment, fecal water content and intestinal propulsion rate of the rats were calculated, the pathological changes in the colon were observed with HE staining. Serum NO and NOS levels and the total protein content and NO, NOS and AChE expressions in the colon tissue were determined. HPLC fingerprints of the transdermal patches were established, and the spectrum-effect relationship between the common peaks of the patches and its therapeutic effect were analyzed. Results Treatment with the transdermal patches containing Cassia seed extract significantly increased fecal water content and intestinal propulsion rate of the rat models, where no pathological changes in the colon tissue were detected. The treatment also suppressed the elevations of serum and colonic NO and NOS levels and reduction of AChE in STC rats. Twenty-eight common peaks were confirmed in the HPLC fingerprints of 6 batches of Cassia seed extract-containing patches. Analysis of the spectrum-effect relationship showed that autrantio-obtusin had the greatest contribution to the therapeutic effect of the patches in STC rats. Conclusion The Cassia seed extract-containing patches alleviates STC in rats via synergistic actions of multiple active ingredients in the extract, where autrantio-obtusin, rhein, chrysoobtusin, obtusin, obtusifolin, emodin, chrysophanol, and physcion are identified as the main active ingredients.

Objective:To study the clinical characteristics，diagnosis，treatment and prognosis of neonatal appendicitis.Methods:From January 2019 to December 2022，19 neonates with appendicitis（appendicitis group）and 38 neonates with sepsis（sepsis group）admitted to the Neonatal Department of Xi'an Children's Hospital Affiliated to Xi'an Jiaotong University were studied.The characteristics of clinical manifestation，imaging，treatment and prognosis of neonates in two groups were analyzed,retrospectively.Results:Among 19 neonates with appendicitis，31.6% were premature，the mean birth weight was（2 927.9±796.2）g，male∶female=2.17∶1.Abdominal distention（8/19，42.1%）and fever（8/19，42.1%）were the first symptoms of appendicitis，and the first symptoms of sepsis were mainly fever（20/38，52.6%）and poor reaction（7/38，18.4%）.In the appendicitis group，the proportions of abdominal distension（89.5% vs. 5.3%），vomiting（36.8% vs. 2.6%），breast resistance（84.2% vs. 39.5%），mental reaction changing（94.7% vs. 71.1%）and abdominal positive signs（84.2% vs. 5.3%）were significantly higher than those in sepsis group（ P<0.05）.C-reactive protein（CRP）was elevated in 16 neonates with appendicitis and 13 neonates with sepsis，and elevated gradually in 14 neonates with appendicitis. Compared with sepsis group，CRP was higher in appendicitis group（ P<0.05）.Fifteen（78.9%）neonates with appendicitis were diagnosed only by ultrasound，mainly manifested as low echo area or liquid dark area in the right abdomen，thickening of the appendix wall or effusion in the cavity，and liquid exudation.Three（15.8%）neonates with appendicitis were diagnosed by ultrasound and CT.Eight（42.1%）neonates with appendicitis were complicated appendiceal perforation.Fifteen neonates with appendicitis were treated by conservative treatment，four cases were treated by operation，and all of them were cured and discharged. Conclusion:Abdominal ultrasonography should be improved as soon as possible in neonates with fever and septicemia，especially those with abdominal symptoms or signs，or CRP increased during treatment，and CT or surgical exploration if necessary,to confirm the diagnosis of neonatal appenditis and early treatment.

Objective To explore the therapeutic effect of transdermal patches containing Cassia seed extract applied at the navel on slow transit constipation (STC) in rats and explore the spectrum-effect relationship of the patches. Method In a STC rat model established by gavage of compound diphenoxylate suspension for 14 days, the transdermal patches containing low, medium and high doses of Cassia seed extract (41.75, 125.25, and 375.75 mg/kg, respectively) were applied at the Shenque acupoint on the abdomen for 14 days after modeling, with constipation patches (13.33 mg/kg) as the positive control. After the treatment, fecal water content and intestinal propulsion rate of the rats were calculated, the pathological changes in the colon were observed with HE staining. Serum NO and NOS levels and the total protein content and NO, NOS and AChE expressions in the colon tissue were determined. HPLC fingerprints of the transdermal patches were established, and the spectrum-effect relationship between the common peaks of the patches and its therapeutic effect were analyzed. Results Treatment with the transdermal patches containing Cassia seed extract significantly increased fecal water content and intestinal propulsion rate of the rat models, where no pathological changes in the colon tissue were detected. The treatment also suppressed the elevations of serum and colonic NO and NOS levels and reduction of AChE in STC rats. Twenty-eight common peaks were confirmed in the HPLC fingerprints of 6 batches of Cassia seed extract-containing patches. Analysis of the spectrum-effect relationship showed that autrantio-obtusin had the greatest contribution to the therapeutic effect of the patches in STC rats. Conclusion The Cassia seed extract-containing patches alleviates STC in rats via synergistic actions of multiple active ingredients in the extract, where autrantio-obtusin, rhein, chrysoobtusin, obtusin, obtusifolin, emodin, chrysophanol, and physcion are identified as the main active ingredients.

ObjectiveTo summarize the modeling methods, test indicators, and evaluation methods of the animal models of urticaria and provide a basis for the subsequent research on urticaria models. MethodWith the keywords of "urticaria" and "animal model" and the time interval from inception to July 13, 2022, relevant articles were retrieved from CNKI, Wanfang Data, VIP, CBM, Web of Science, Embase, and PubMed. Two evaluators independently screened the articles and extracted the publishing time, sources, animal conditions, modeling methods, modeling time, and test indicators from the articles meeting the inclusion criteria to establish a data library for quantitative statistics and analysis. ResultA total of 116 articles were included, involving 129 animal experiments (102 in Chinese and 27 in English) of urticaria. In the last three years, the studies about the animal models of urticaria presented an obvious upward trend, and the articles were dominated by dissertations. KM mice and SD rats of both females and males were mainly used for the modeling of urticaria, and the models were mainly established by passive sensitization of skin for 14-16 days. The models were mainly evaluated based on apparent indicators such as blue-stained lesion area and ear swelling, supplemented by the pathological indicators of the skin and serum. ConclusionAlthough the experimental studies of urticaria are increasing, the modeling methods lack unified modeling standards and have low coincidence with clinical symptoms. Therefore, this paper analyzed the modeling elements and evaluation criteria of urticaria animal models, and proposed that both male and female KM mice (6-8 weeks old) or SD rats (8-10 weeks old) of SPF grade should be preferentially selected for modeling. Active and passive sensitization can be combined for the modeling, and the specific modeling elements such as modeling time and sensitization times need to be further explored. The model evaluation should include four aspects of behavior, appearance, pathology, and immunity.

OBJECTIVE: To investigate the spectrum-effect relationship between the total anthraquinone extract of Cassia seeds and fluorouracil (5-Fu)-induced liver injury in mice and identify the effective components in the extract. METHODS: A mouse model of liver injury was established by intraperitoneal injection of 5-Fu, with bifendate as the positive control. The serum levels of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and myeloperoxidase (MPO), superoxide dismutase (SOD) and total antioxidant capacity (T-AOC) in the liver tissue were detected to investigate the effect of the total anthraquinone extract of Cassia seeds (0.4, 0.8 and 1.6 g/kg) on liver injury induced by 5-Fu. HPLC fingerprints of 10 batches of the total anthraquinone extracts were established to analyze the spectrum- effectiveness of the extract against 5- Fu- induced liver injury in mice and screen the effective components using the grey correlation method. RESULTS: The 5- Fu- treated mice showed significant differences in liver function parameters from the normal control mice (P < 0.05), suggesting successful modelling. Compared with those in the model group, serum ALT and AST activities were decreased, SOD and T- AOC activities significantly increased, and MPO level was significantly lowered in the mice treated with the total anthraquinone extract (all P < 0.05). HPLC fingerprints of the 31 components in the total anthraquinone extract of Cassia seeds showed good correlations with the potency index of 5-Fu-induced liver injury but with varying correlation strengths. The top 15 components with known correlations included aurantio-obtusina (peak 6), rhein (peak 11), emodin (peak 22), chrysophanol (peak 29) and physcion (peak 30). CONCLUSION The effective components in the total anthraquinone extract of Cassia seeds, including aurantio-obtusina, rhein, emodin, chrysophanol, and physcion, are coordinated to produce protective effects against 5-Fu-induced liver injury in mice.
Animals ; Mice ; Emodin ; Cassia ; Chemical and Drug Induced Liver Injury, Chronic ; Anthraquinones ; Antioxidants ; Fluorouracil/adverse effects* ; Plant Extracts/pharmacology*

Objective To investigate the efficacy of video-assisted teaching ward rounds for typical cases of oph-thalmology in clinical practice for medical undergraduates.Methods A total of 45 students from clinical medicine in Peking Union Medical College were enrolled.They were randomly divided into the experimental group(23 students)and control group(22 students).Primary angle closure glaucoma(PACG)was selected as the learning content,the experimental group was trained by video-assisted teaching ward rounds,while the control group was trained by internship in outpatient clinic.All students joined the test of typical case PACG and a ques-tionnaire survey was implemented for the experimental group.Results The average score of experimental group was higher than control group[(84.30±4.53)vs.(78.05±5.76),t＝4.05,P＜0.001].For video-assisted teaching ward rounds,in experimental group,86.9%(20/23)students believed it was more practical,95.6%(22/23)students thought it was very helpful and 91.3%(21/23)students considered it was conductive to im-prove interest of learning and clinical thinking ability.Conclusions Video-assisted teaching ward rounds improves students'understanding memory of ophthalmic typical cases,which is a potential supplement teaching method in clinical practice training of ophthalmology for medical undergraduates.

Percutaneous coronary intervention(PCI)is one of the most important therapeutic measures for coronary heart disease.It can quickly and effectively relieve coronary artery obstruction.Patients with coronary heart disease often suffer from the complication of emotional disorders like anxiety and depression.The incidence of anxiety and depression in patients having undergone PCI is significantly higher in those having not.But anxiety and depression can remarkably increase the major adverse cardiac events(MACE)in patients after PCI.This article reviews the associations,mechanisms and treatments of anxiety and depression after PCI.

Objective:To establish an HPLC-DAD-ELSD method for the simultaneous determination of eight main active components in Buyang Huanwu Decoction, including hydroxysafflor yellow A, paeoniflorin, calycosin glycoside, ferulic acid, ononin, calycosin, fermononetin and astragaloside.Methods:Agilent Eclipse XDB-C18 column (250 mm×4.6 mm, 5 μm) was used with acetonitrile-0.1% formic acid as the mobile phase. The flow rate was 1.0 ml/min; the column temperature was 30 ℃; the detection wavelengths were 230 nm (paeoniflorin), 254 nm (calycosin glycoside, ononin, calycosin, fermononetin), 322 nm (ferulic acid) and 403 nm (hydroxysafflor yellow A); the drift tube temperature of the evaporative light scattering detector was 60 ℃; the carrier gas flow rate was 1.6 L/min.Results:Under these conditions, the separation of hydroxysafflor yellow A, paeoniflorin, calycosin glycoside, ferulic acid, ononin, calycosin, fermononetin and astragaloside was good, and the linear relationship was in line with the requirements ( r=0.994 0-0.999 9). The average recovery was 97.8% - 101.4% ( RSD was 1.28% - 3.70%). Conclusion:The method is simple, stable and reproducible, and can be used for the quality control of Buyang Huanwu Decoction.