The relationship between fall and loneliness among older people in China: the mediating role of personality trait.

Aims: We aimed to explore the role of personality traits between fall and loneliness. Methods: A questionnaire survey was used to investigate falls, the big five personality traits, and loneliness among older people (≥ 60 years old) in China mainland. Results: A total of 4,289 older people participated in the survey. There are significant differences in age, marital status, education level, residence, solitariness, and fall in relation to loneliness among older people. Falls, especially when they occurred one time increase the loneliness of older people. Agreeableness, conscientiousness, and neuroticism were significant mediating effects between falls and loneliness. Conclusion: This study implied that agreeableness, conscientiousness, and neuroticism were meditating factors between falls and loneliness. In the future, we should consider the big five personality traits more to understand loneliness and offer older people interventions for reducing their loneliness. The study design was cross-sectional, so the temporal precedence of mediators and causality could not be tested. Because the data were collected retrospectively, current loneliness is likely to have confounding effects on retrospective recall.

Inhibition of histone methyltransferase PRMT5 attenuates cisplatin-induced hearing loss through the PI3K/Akt-mediated mitochondrial apoptotic pathway / 药物分析学报

This study aimed to evaluate the therapeutic potential of inhibiting protein arginine methyltransferase 5(PRMT5)in cisplatin-induced hearing loss.The effects of PRMT5 inhibition on cisplatin-induced auditory injury were determined using immunohistochemistry,apoptosis assays,and auditory brainstem response.The mechanism of PRMT5 inhibition on hair cell survival was assessed using RNA-seq and Cleavage Under Targets and Tagment-quantitative polymerase chain reaction(CUT&Tag-qPCR)analyses in the HEI-OC1 cell line.Pharmacological inhibition of PRMT5 significantly alleviated cisplatin-induced damage to hair cells and spiral ganglion neurons in the cochlea and decreased apoptosis by protecting mitochondrial function and preventing the accumulation of reactive oxygen species.CUT&Tag-qPCR analysis demonstrated that inhibition of PRMT5 in HEI-OC1 cells reduced the accumulation of H4R3me2s/H3R8me2s marks at the promoter region of the Pik3ca gene,thus activating the expression of Pik3ca.These findings suggest that PRMT5 inhibitors have strong potential as agents against cisplatin-induced ototoxicity and can lay the foundation for further research on treatment strategies of hearing loss.

Clinical observation of chemotherapy combined with camrelizumab in patients with inoperable microsatellite stable type colorectal cancer / 中国药房

OBJECTIVE To evaluate the clinical efficacy and safety of XELOX chemotherapy （oxaliplatin+capecitabine） combined with antiangiogenic agent （apatinib） and immunotherapy （camrelizumab） in patients with inoperable metastatic colorectal cancer （CRC）of microsatellite stable （MSS） type. METHODS Clinical medical records of 40 patients with inoperable metastatic CRC of MSS type treated in Lishui People’s Hospital from January 2020 to January 2021 were retrospectively collected. According to the treatment plan， the patients were divided into control group （20 cases） and observation group （20 cases）. Control group was given XELOX+apatinib regimen， while observation group was given XELOX+apatinib+camrelizumab regimen. Every 3 weeks was a treatment cycle， and the treatment lasted for 2 consecutive cycles. The objective response rate （ORR）， disease control rate （DCR）， progression-free survival （PFS）， overall survival （OS） and adverse events （AEs） were recorded for all patients. RESULTS The ORR and DCR of observation group were 65.0% and 85.0%， respectively； and the ORR and DCR of control group were 35.0% and 75.0%， respectively， with no statistical significance between 2 groups （P＞0.05）. The median PFS of observation group and control groups were 16.0 months and 8.0 months， respectively； and the median OS were 19.0 months and 12.5 months， respectively， with statistical significance between 2 groups （P＜0.05）. Each patient in both groups had at least one AEs， and the incidences of reactive skin capillary hyperplasia and hyperthyroidism in observation group （40.0%， 20.0%） were significantly higher than those in control group （both were 0） （P＜0.05）. The incidence of nausea and vomiting in control group （90%） was significantly higher than observation group （10%） （P＜0.05）. There were 14 cases （70.0%） of patients with grade 3 or above AEs in observation group， and only 5 cases （25.0%） in control group， with statistical significance between 2 groups （P＜0.05）. However， no severe AEs that could not be tolerated or fatal occurred in the two groups， which could be alleviated after drug withdrawal or treatment. CONCLUSIONS The efficacy of XELOX chemotherapy combined with apatinib and camrelizumab in inoperable metastatic CRC patients of MSS type is comparable to that of XELOX chemotherapy combined with apatinib， but it has certain advantages in ORR， PFS and OS， and controllable safety.

Discovery and identification of EIF2AK2 as a direct key target of berberine for anti-inflammatory effects

Using chemoproteomic techniques, we first identified EIF2AK2, eEF1A1, PRDX3 and VPS4B as direct targets of berberine (BBR) for its synergistically anti-inflammatory effects. Of them, BBR has the strongest affinity with EIF2AK2 via two ionic bonds, and regulates several key inflammatory pathways through EIF2AK2, indicating the dominant role of EIF2AK2. Also, BBR could subtly inhibit the dimerization of EIF2AK2, rather than its enzyme activity, to selectively modulate its downstream pathways including JNK, NF-κB, AKT and NLRP3, with an advantage of good safety profile. In EIF2AK2 gene knockdown mice, the inhibitory IL-1β, IL-6, IL-18 and TNF-α secretion of BBR was obviously attenuated, confirming an EIF2AK2-dependent anti-inflammatory efficacy. The results highlight the BBR's network mechanism on anti-inflammatory effects in which EIF2AK2 is a key target, and inhibition of EIF2AK2 dimerization has a potential to be a therapeutic strategy against inflammation-related disorders.

Teaching reform and practice of 'Production Internship' course for biotechnology specialty from the perspective of training application-oriented talents / 生物工程学报

Production internship is an important teaching tache for undergraduate students to carry out engineering training by using professional skills, and it is a key starting point for fostering application-oriented talents in biotechnology. The Course Group of 'production internship of biotechnology majors' of Binzhou University is investigating application-oriented transformation for local regular colleges and universities, as well as fostering high-level application-oriented talents. By taking green fluorescent protein (GFP) polyclonal antibody as an example, the reform and practice on teaching content, teaching mode, assessment method, continuous improvement of curriculum were carried out. Moreover, the characteristics of the Yellow River Delta-Binzhou Biotechnology & Pharmaceutical Industrial Cluster were taken into account to intensify academic-enterprise cooperation. On one hand, this Course Group designed and rearranged the course contents, carried out essential training through online resources and platforms such as virtual simulation, and recorded, tracked and monitored the progress of production internship through practical testing and software platforms like 'Alumni State'. On the other hand, this Course Group established a practice-and application-oriented assessment method in the process of production internship and a dual evaluation model for continuous improvement. These reform and practices have promoted the training of application-oriented talents in biotechnology, and may serve as a reference for similar courses.

Guild-level microbiome signature associated with COVID-19 severity and prognosis

COVID-19 severity has been associated with alterations of the gut microbiota. However, the relationship between gut microbiome alterations and COVID-19 prognosis remains elusive. Here, we performed a genome-resolved metagenomic analysis on fecal samples collected from 300 in-hospital COVID-19 patients at time of admission. Among the 2,568 high quality metagenome-assembled genomes (HQMAGs), Redundancy Analysis identified 33 HQMAGs which showed differential distribution among mild, moderate, and severe/critical severity groups. Random Forest model based on these 33 HQMAGs classified patients from different severity groups (average AUC = 0.79). Co-abundance network analysis found that the 33 HQMAGs were organized as two competing guilds. Guild 1 harbored more genes for short-chain fatty acid biosynthesis, and fewer genes for virulence and antibiotic resistance, compared with Guild 2. Random Forest regression showed that these 33 HQMAGs at admission had the capacity to predict 8 clinical parameters, which are predictors for COVID-19 prognosis, at Day 7 in hospital. Moreover, the dominance of Guild 1 over Guild 2 at admission predicted the death/discharge outcome of the critical patients (AUC = 0.92). Random Forest models based on these 33 HQMAGs classified patients with different COVID-19 symptom severity, and differentiated COVID-19 patients from healthy subjects, non-COVID-19, and pneumonia controls in three independent datasets. Thus, this genome-based guild-level signature may facilitate early identification of hospitalized COVID-19 patients with high risk of more severe outcomes at time of admission.

Inhibiting DNA methylation alleviates cisplatin-induced hearing loss by decreasing oxidative stress-induced mitochondria-dependent apoptosis via the LRP1-PI3K/AKT pathway

Cisplatin-related ototoxicity is a critical side effect of chemotherapy and can lead to irreversible hearing loss. This study aimed to assess the potential effect of the DNA methyltransferase (DNMT) inhibitor RG108 on cisplatin-induced ototoxicity. Immunohistochemistry, apoptosis assay, and auditory brainstem response (ABR) were employed to determine the impacts of RG108 on cisplatin-induced injury in murine hair cells (HCs) and spiral ganglion neurons (SGNs). Rhodamine 123 and TMRM were utilized for mitochondrial membrane potential (MMP) assessment. Reactive oxygen species (ROS) amounts were evaluated by Cellrox green and Mitosox-red probes. Mitochondrial respiratory function evaluation was performed by determining oxygen consumption rates (OCRs). The results showed that RG108 can markedly reduce cisplatin induced damage in HCs and SGNs, and alleviate apoptotic rate by protecting mitochondrial function through preventing ROS accumulation. Furthermore, RG108 upregulated BCL-2 and downregulated APAF1, BAX, and BAD in HEI-OC1 cells, and triggered the PI3K/AKT pathway. Decreased expression of low-density lipoprotein receptor-related protein 1 (LRP1) and high methylation of the LRP1 promoter were observed after cisplatin treatment. RG108 treatment can increase LRP1 expression and decrease LRP1 promoter methylation. In conclusion, RG108 might represent a new potential agent for preventing hearing loss induced by cisplatin via activating the LRP1-PI3K/AKT pathway.

Application of problem-oriented clinical thinking teaching in gastroentrology rotation for general practice in-service training / 中华全科医师杂志

Sixty general practitioners of in-service training undertaking rotation in gastroenterology department of Qingdao Municipal Hospital from July 2017 to July 2019 were randomized assigned in trial group ( n=30) and control group ( n=30). The problem-oriented mode was applied in trial group and conventional mode was applied in control group for teaching of two typical digestive diseases (upper gastrointestinal bleeding and acute pancreatitis). The formative evaluation and questionnaire survey were used to compare the teaching effects and the results of evaluation were compared with χ 2 test by SPSS 17.0 between two groups. The excellent and good rates of evaluation for the clinical psychological quality, clinical reasoning ability, doctor-patient communication ability and practice-based learning and improvement ability in trial group were significantly higher than those in the control group(χ2=7.38, P=0.03; χ2=12.96, P<0.01; χ2=23.33, P<0.01; χ2=16.14, P<0.01). Questionnaire survey showed more satisfaction towards teaching method in trial group was higher than that in control group(χ2=12.86, P<0.01); and the clinical reasoning ability, learning initiative and self-confidence in trial group were improved more markedly than those in control group(χ2=8.26, P=0.02; χ2=19.48, P<0.01; χ2=21.46, P<0.01). The problem-oriented clinical thinking teaching model demonstrates good effects on clinical comprehensive ability for general practitioners of in-service training during gastroenterology rotation, which is worth further promotion.

Efficacy of different doses of apatinib combined with chemotherapy in the treatment of advanced gastric cancer and its effect on prognosis / 中国基层医药

Objective:To investigate the efficacy of different doses of apatinib combined with chemotherapy in the treatment of advanced gastric cancer and its effect on prognosis.Methods:Sixty-nine patients with advanced gastric cancer who received treatment in Lishui City People's Hospital from January 2015 to February 2019 were retrospectively analyzed. All patients received apatinib combined with teggio chemotherapy. These patients were divided into groups A, B and C according to the different dosages of apatinib used: 250 mg/d ( n = 21, group A), 500 mg/d ( n = 23, group B) and 850 mg/d ( n = 23, group C). The control rate of gastric cancer, serum levels of carcinoembryonic antigen, carbohydrate antigen 19-9 (CA19-9), carbohydrate antigen 72-4 (CA72-4), toxic and side effects, and survival within 1 year after surgery were determined among the three groups. Results:By the end of follow-up, one patient from group A was lost, one patient from group B interrupted medication because of personal reasons, and two patients from group C withdrew from the treatment due to serious discomfort caused by drugs. After treatment, disease control rate in group C was significantly higher than that in group A [91.30% (21/23) vs. 60.00% (12/20), χ2 = 6.484, P < 0.05]. Serum levels of carcinoembryonic, CA19-9 and CA72-4 in group C were (27.51 ± 2.21) μg/L, (101.46 ± 8.02) g/L, (46.34 ± 6.15) U/mL, respectively, which were significantly lower than those in group B [(29.33 ± 2.17) μg/L, (106.67 ± 8.10) g/L, (50.67 ± 6.20) U/mL, t = 2.786, 2.168, 2.352, all P < 0.05]. Serum levels of carcinoembryonic, CA19-9 and CA72-4 in group B were significantly lower than those in group A [(31.63 ± 2.92) μg/L, (112.12 ± 8.38) g/L, (55.12 ± 6.48) U/mL, t = 2.915, 2.142, 2.274, all P < 0.05]. The incidences of hand foot syndrome and gastrointestinal discomfort in group C were (34.78% (8/23) and (39.13% (9/23), respectively, which were significantly higher than those in group A [15.00% (3/23) and 25.00% (5/20), χ2 = 5.734, 4.769, both P < 0.05]. After 1-year follow-up,1-year survival rate in group C was significantly higher than that in group A [39.13% (9/23) vs. 10.00% (2/20), log-Rank χ2 = 6.600, P < 0.05]. Conclusion:High-dose apatinib combined with chemotherapy in the treatment of advanced gastric cancer has a high disease control rate and a high 1-year survival rate, but it has serious adverse drug reactions.

Phenotypic and genetic analysis of acute megakaryoblastic leukemia in young children with WT1, MLL-PTD and EVI1 genes / 中华医学遗传学杂志

OBJECTIVE@#To explore the phenotypic and genetic characteristics of acute megakaryoblastic leukemia (AMKL) in young children accompany by WT1, MLL-PTD and EVI1, in order to improve the diagnosis level of AMKL.@*METHODS@#EDTA-K@*RESULTS@#White blood cell count was 12.3× 10@*CONCLUSION@#Acute megakaryocytic leukemia has unique and complex phenotypic and genetics characteristics.

Evaluation and associated factors of the responses to public health emergencies among college students in Shandong Province / 中国学校卫生

Objective@#To evaluate response to public health emergencies in colleges and universities and associated factors, and to provide references for emergency response mechanisms in colleges.@*Methods@#Using stratified random sampling, recruited 7 719 students in 6 universities in Shandong Province during April May 2020, and analyzed the data with SPSS 25.0 software.@*Results@#About 65.5% of college students reported response to public health emergencies in their college, 67.7% of the students reported that colleges have emergency plans, 53.9% of the students reported that colleges have carried out simulated emergency training, and 64.7% of the students reported that colleges have carried out health education. Evaluation from students for responding to public health emergencies in colleges and universities scored(24.15±4.59), of which measures and policies related to epidemic control were highest(4.05±0.81), while mental health education or counselling services were lowest (3.95±0.85). Gender, grade, major, type of household registration, emergency response measures, emergency response plan, emergency simulation training, health education were associated with the evaluation of the measures by college students(t/F=5.04，43.83，79.92，-3.40，26.86，34.83，29.35，35.01，P<0.01).@*Conclusion@#While recognizing the overall performance on public health responses in universities, college students believe certain limitations still exist; colleges and universities should continuously improve the emergency prevention and control system of public health emergencies in response to the effectiveness and deficiencies in the prevention and control process.

Impact of arm choice for peripherally inserted central catheter (PICC) insertion on patients: a cross-sectional study.

Background: Arm choice for peripherally inserted central catheter (PICC) insertion is often determined by PICC nurses. Objectives: To explore the impact of arm choice (dominant or non-dominant) on the rate of catheter-related complications and degree of comfort in patients with PICCs. Design: A cross-sectional study. Methods: We used questionnaires and scales to collect 255 patients' general information, catheter-related complications and comfort degree. They were divided into two groups (PICC inserted in the dominant or non-dominant arm). Results: There were significant differences in the rate of PICC occlusion and insertion site bleeding (χ 2 = 9.829, P < 0.05; χ 2 = 6.502, P < 0.05), both were lower in the non-dominant group than in the dominant group. Patients in the non-dominant group had a higher degree of comfort (Z = -10.166, P < 0.01). Conclusion: Inserting into non-dominant arms is related to the lower rate of catheter-related complications and higher degree of comfort for patients. Impact statement: These findings provide practical evidence for nurses to make a better choice.

Application of various genetic techniques for the diagnosis of Prader-Willi syndrome / 中华医学遗传学杂志

OBJECTIVE@#To discuss the advantages and technical limitations of various molecular genetic techniques in the diagnosis of two infants featuring all-round developmental retardation.@*METHODS@#The two patients were initially screened by using chromosomal microarray analysis (CMA). For patient 1, his parents were also subjected to CMA analysis, and the data was analyzed by using ChAS and UPD-tool software. For patient 2, methylation-specific PCR (MS-PCR) was carried out.@*RESULTS@#Patient 1 was diagnosed with maternal uniparental disomy (UPD) type Prader-Willi syndrome (PWS) by CMA and UPD-tool family analysis. His chromosomes 15 were of maternal UPD with homology/heterology. Patient 2 was diagnosed with deletion type PWS by combined CMA and MS-PCR.@*CONCLUSION@#Correct selection of laboratory methods based on the advantages and limitations of various molecular techniques can help with diagnosis of genomic imprinting disorders and enable better treatment and prognosis through early intervention.

Prenatal diagnosis and genetic analysis of a 46,XN,del(11)(q14q22) fetus / 中华医学遗传学杂志

OBJECTIVE@#To diagnose a 46,XN,del(11)(q14q22) fetus by non-invasive prenatal testing (NIPT), karyotype analysis and whole genome sequencing (WGS).@*METHODS@#Peripheral blood sample of the gravida was taken for NIPT screening. Blood samples of the gravida, her husband, and umbilical cord blood were also taken for chromosome karyotyping and whole genome sequencing (WGS).@*RESULTS@#NIPT screening indicated the fetus has carried partial deletion of chromosome 11, while no chromosomal abnormality was found with the cord blood sample due to the low resolution of G-banding analysis. WGS analysis of the cord blood indicated 46,XN,del(11q14.3q22.1). seq[GRCh37/hg19] (90 623 404-97 469 319)×1, 6.85 Mb. The karyotype of the fetus was eventually determined as 46,XN,del(11)(q14q22). Karyotyping analysis suggested that the gravida and her husband were 46,XX,del(11)(q14q22)[8]/46,XX[92] and 46,XY, respectively. However, neither of them was found to harbor the del(11)(q14q22) by WGS.@*CONCLUSION@#The abnormal karyotype of the fetus has derived from its mother's low percentage mosaicism. Combined NIPT, karyotyping analysis and WGS can detect chromosomal disorders with accuracy.

Exosomal proteomics study in the tumorigenesis, development and treatment of hepatocellular carcinoma / 生物工程学报

Hepatocellular carcinoma (HCC) is one of the five most common malignant tumors. According to the latest statistics of the World Health Organization (WHO), the incident and mortality rates of HCC ranks the eighth and third in the world, respectively, which severely affect people's health. Exosomes are extracellular vesicles with a bilayer of phospholipids, which carry active substances such as proteins and nucleic acids derived from their mother cells. These exosomes greatly facilitate the exchange of substances and information between cells, and coordinate physiological and pathological processes in the body. In recent years, a large number of studies have shown that exosomal proteins play important roles in the tumorigenesis, development, diagnosis and treatment of HCC. Here we review the composition and functions of exosomes and the role of exosomal proteins in HCC.

The mediating role of internalized stigma between insight and self-esteem among patients with schizophrenia / 中华行为医学与脑科学杂志

Objective@#To explore the relationship between internalized stigma and insight, self-esteem in patients with schizophrenia.@*Methods@#A total of 144 schizophrenic patients were investigated by the general information questionnaire, insight and treatment attitude questionnaire (ITAQ), internalized stigma of mental illness scale-Chinese version (ISMI-C) and the self-esteem scale (SES). Pearson correlative analysis and Bootstrap program mediation effect test were used to data analysis.@*Results@#There was a significantly positively correlation between insight score(11.24±4.08) and internalized stigma score(2.18±0.65) of 144 schizophrenic patients(r=0.236, P<0.05). The Self-esteem score(27.57±3.76) was negatively correlated with insight score(r=-0.177, P<0.05) and internalized stigma score(r=-0.661, P<0.05). The mediation effect test analysis showed that the internalized stigma played a full mediating role in the relationship between insight and self-esteem, and the effect size was -0.143.@*Conclusion@#Insight can indirectly affect self-esteem via internalized stigma in patients with schizophrenia.Taking measures to decrease inpatients' internalized stigma level and improve their illness awareness should be paid attention in clinical practice.

The mediating role of internalized stigma between insight and self-esteem among patients with schizo-phrenia / 中华行为医学与脑科学杂志

Objective To explore the relationship between internalized stigma and insight,self-es-teem in patients with schizophrenia. Methods A total of 144 schizophrenic patients were investigated by the general information questionnaire,insight and treatment attitude questionnaire (ITAQ),internalized stigma of mental illness scale-Chinese version (ISMI-C) and the self-esteem scale (SES). Pearson correlative analysis and Bootstrap program mediation effect test were used to data analysis. Results There was a significantly positively correlation between insight score(11. 24±4. 08) and internalized stigma score(2. 18±0. 65) of 144 schizophrenic patients(r=0. 236,P<0. 05). The Self-esteem score(27. 57±3. 76) was negatively correlated with insight score(r=-0. 177,P<0. 05) and internalized stigma score(r=-0. 661,P<0. 05). The mediation effect test analysis showed that the internalized stigma played a full mediating role in the relationship between insight and self-esteem,and the effect size was -0. 143. Conclusion Insight can indirectly affect self-es-teem via internalized stigma in patients with schizophrenia. Taking measures to decrease inpatients' internal-ized stigma level and improve their illness awareness should be paid attention in clinical practice.

Practice of the rotation training model for professional clinical postgraduate students in department of gastroenterology / 中华医学教育探索杂志

Objective To investigate the significance of "merge" model versus "traditional" model in rotation training for professional clinical postgraduate students in department of gastroenterology. Methods The professional clinical postgraduate students who underwent rotation training in Qingdao Municipal Hospital from July 2012 to July 2016 were enrolled as subjects and were trained with the"merge" model and the "traditional" model, respectively. The two groups of subjects were compared in terms of clinical knowledge , skills , and core competencies . Results The postgraduates trained by the"merge" model had a significantly higher total score of clinical examinations than those trained by the"traditional" model [(92.60±2.52) vs. (83.80±3.14), t=10.93, P<0.01], while there were no significant differences in professional quality and doctor-patient communication between the two groups. Compared with those trained with the"traditional"model, the postgraduates trained by the"merge"model had significantly better understanding of clinical knowledge and clinical thinking ability, diagnosis and treatment skills, and psychological quality (χ2=27.00, 10.23, and 12.21, all P<0.01);however, there was no significant difference in clinical research ability between the two groups (χ2=1.39, P=0.24). Conclusion The model of professional clinical postgraduate training combined with standardized training of residents is superior to the traditional training model, and compared with the "traditional" model, the "merge" model is more beneficial to the training of comprehensive clinical practice abilities and thus holds promise for further application.

Effects of decline of pH value on cardiomyocyte viability of rats and the mechanism / 中华烧伤杂志

Objective@#To explore the effects of decline of pH value on cardiomyocyte viability of rats, and to analyze the possible mechanism.@*Methods@#Hearts of five newborn Sprague-Dawley rats were isolated, and then primary cardiomyocytes were cultured and used in the following experiments. (1) The primary cardiomyocytes were divided into pH 7.4+ 6 h, pH 7.0+ 6 h, pH 6.5+ 6 h, pH 6.0+ 6 h, pH 6.5+ 1 h, and pH 6.5+ 3 h groups according to the random number table, with 4 wells in each group. After being routinely cultured for 48 h (similarly hereinafter), cells in pH 7.4+ 6 h, pH 7.0+ 6 h, pH 6.5+ 6 h, and pH 6.0+ 6 h groups were cultured with pH 7.4, pH 7.0, pH 6.5, and pH 6.0 DMEM-F12 medium (similarly hereinafter), respectively, and then they were cultured for 6 h. Cells in pH 6.5+ 1 h and pH 6.5+ 3 h groups were cultured with pH 6.5 medium, and then they were cultured for 1 h and 3 h, respectively. Viability of cells was detected by methyl-thiazolyl-tetrazolium (MTT) method. (2) The primary cardiomyocytes were divided into pH 7.4, pH 6.5, and pH 6.5+ taxol groups according to the random number table, with 2 wells in each group. Cells in pH 7.4 group were cultured with pH 7.4 medium, while cells in pH 6.5 and pH 6.5+ taxol groups were cultured with pH 6.5 medium. Cells in pH 6.5+ taxol group were added with taxol of a final molarity of 0.2 μmol/L in addition, and then they were cultured for 6 h. Morphology and density of microtubule of cells was detected by immunofluorescence assay. (3) The primary cardiomyocytes were grouped and treated as in experiment (2), with 2 wells in each group. The expressions of polymerized microtubulin and free microtubulin were determined with Western blotting. (4) The primary cardiomyocytes were grouped and treated as in experiment (2), with 4 wells in each group. Viability of cells after treated with taxol was detected by MTT method. Data were processed with one-way analysis of variance and LSD-t test.@*Results@#(1) The viability of cells in pH 7.4+ 6 h, pH 7.0+ 6 h, pH 6.5+ 6 h, pH 6.0+ 6 h, pH 6.5+ 1 h, and pH 6.5+ 3 h groups were 1.00±0.08, 0.90±0.08, 0.85±0.06, 0.83±0.04, 0.91±0.10, and 0.89±0.10, respectively. Compared with that in pH 7.4+ 6 h group, viability of cells in pH 7.0+ 6 h, pH 6.5+ 6 h, pH 6.0+ 6 h, pH 6.5+ 1 h, and pH 6.5+ 3 h groups were all decreased in different degrees (t=2.476, 4.002, 4.996, 2.168, 2.400, P<0.05). (2) Microtubules of cells in pH 7.4 group were radially distributed around the nucleus with clear tubular structure. Compared with that in pH 7.4 group, the skeleton of microtubules of cells in pH 6.5 group was obviously damaged, with broken structure of microtubule and reduced density. Compared with that in pH 6.5 group, the damage degree of microtubules of cells in pH 6.5+ taxol group was obviously alleviated, and the structure of microtubules basically returned to normal. (3) Compared with that in pH 7.4 group, the expression of free microtubulin of cells in pH 6.5 group was significantly increased (t=3.030, P<0.05), while the expression of polymerized microtubulin of cells was significantly decreased (t=8.604, P<0.05). Compared with that in pH 6.5 group, the expression of free microtubulin of cells in pH 6.5+ taxol group was significantly decreased (t=4.559, P<0.05), while the expression of polymerized microtubulin of cells was significantly increased (t=5.472, P<0.05). (4) Viability of cells in pH 7.4, pH 6.5, and pH 6.5+ taxol groups were 1.00±0.10, 0.83±0.04, and 0.93±0.10, respectively. Compared with that in pH 7.4 group, the viability of cells in pH 6.5 group was obviously declined (t=4.412, P<0.05). Compared with that in pH 6.5 group, the viability of cells in pH 6.5+ taxol group was obviously increased (t=2.461, P<0.05).@*Conclusions@#The decline of pH value reduces the viability of cardiomyocytes of rats through destroying the skeleton of microtubule. Stabilizing microtubule skeleton can significantly reduce acidic treatment-induced damage and ameliorate cardiomyocyte viability.

Construction of core competence evaluation index system for intravenous therapy specialized nurses / 中华护理杂志

Objective To construct the core competence evaluation index system for intravenous therapy specialized nurses.Methods Using literature research,group discussion,and two-round Delphi expert consultation,the core competence evaluation index system for intravenous therapy specialized nurses was constructed.Results The response rates for two rounds of expert consultation were both 100％,authority coefficients were 0.93 and 0.94,and coordination coefficients at all levels ranged from 0.252 to 0.418.The core competence evaluation index system for intravenous therapy specialized nurses consisted of 8 first-class indexes,35 second-class indexes and 93 third-class indexes.Conclusion The enthusiasm,authority,concentration degree and coordination degree of experts were comparatively high.It can provide references for training,assessment,certification,utilization and management of intravenous therapy specialized nurses.