AIM: To investigate the changes in intracellular potassium activity(a iK) and membrane potential(V_m) induced by low external sodium infusion (Low _o) and to detect the mechanisms involved and the relationship between a iK and V_m. METHODS: a iK and V_m were measured in infusion with different sodium concentrations using methods of convenient and ion selective microelectrodes in guinea pig ventricular myocardium. RESULTS: Low _o resulted in a decrease in a iK and an increase in V_m in a Na + concentration-dependent manner.At the same time,contraction and resting potential increased, and action potential duration decreased markedly,but action potential amplitude was not affected. A change of the pH from 7.4 to 7.0 in low _o solution reduced the decrease in a iK, but did not affect the increase in V_m. CONCLUSION: A better linear relationship appeared between the changes in a ik and _o or in V_m and _o,while during each low _o the change in both a iK or V_m may reach a new balance level.

Extracurricular activities are necessary complementarity to curricular study and play an important role in medical education.Research and practice of how to develop the extracurricular activities in medical students were carried out,and good results were achieved in the aspect of the development of students' comprehensive quality and practical ability.

Objective:To explore correlation between RoSCo score and postoperative absolute bed rest time in patients undergoing laparoscopic partial nephrectomy (LPN) .Methods:The imaging data and clinical data of patients undergoing LPN from January 2018 to July 2019 in a Class ⅢGrade A hospital in Suzhou were retrospectively analyzed. RoSCo score was calculated by RENAL score, body mass index (BMI) and Charlson comorbidity index. According to the score, patients were divided into low-risk group (RoSCo score≤4 points) , medium-risk group (RoSCo score of 5 to 6 points) , high-risk group (RoSCo score≥7 points) , and postoperative absolute bed rest time of patients in three groups were collected. The kruskal-Wallis H test of non-parametric test was used to compare the absolute bed rest time of patients in the three groups, and Spearman correlation method was used to analyze the correlation between RoSCo score and postoperative absolute bed rest time. Results:A total of 164 LPN patients were included in the study, including 82 cases in the low-risk group, 65 cases in the medium-risk group and 17 cases in the high-risk group. The median and quartile of absolute bed rest time of all patients was 7 (6, 8) d, including 6 (5, 6) d in the low-risk group, 8 (7, 8) d in the medium-risk group and 11 (11, 12) d in the high-risk group. Postoperative absolute bed rest time of low-risk group, medium-risk group and high-risk group classified by RoSCo score were different, and the differences were statistically significant ( H=112.9, P<0.001) . The pairwise test after using Bonferroni method to correct the significance level found that pairwise comparison of the three groups showed statistically significant differences (all adjusted P<0.001) . RoSCo score was positively correlated with postoperative absolute bed rest time ( r=0.815, P<0.001) . Conclusions:RoSCo score of patients undergoing LPN has a significant positive correlation with postoperative absolute bed rest time. The higher the RoSCo score is, the longer the absolute bed rest time is. Therefore, nursing staff can predict the postoperative absolute bed rest time of LPN patients based on RoSCo score so as to provide a basis for clinical nursing decision.

Objective:To construct a color assessment tool for continuous bladder irrigation (CBI) drainage fluid and to explore its clinical value.Methods:The color assessment tool for CBI drainage fluid (tentative version) was constructed through literature review, expert meetings and practical development, and its consistency was tested and the tool was improved to form a color assessment tool for CBI drainage fluid. Convenience sampling was used to select patients with benign prostatic hyperplasia who underwent transurethral resection of the prostate (TURP) in the First Affiliated Hospital of Soochow University from April to May 2020. According to the assessment method of the tool, the patient's drainage fluid color was evaluated and recorded.Results:The color assessment tool for CBI drainage fluid included 6 color scales, and the corresponding Pantone color card codes were 503C, 3519C, 701C, 702C, 710C, 1807C respectively, and the blood concentration was 0.125%, 0.5%, 1.0%, 2.0%, 4.0% and 8.0% respectively. The tool was used to evaluate the drainage fluid color in 29 patients after TURP. Each evaluation took (5.12±2.41) s; when the color scale was greater than number two, complications such as the bladder spasm and blood clot blockage occurred.Conclusions:The construction method of color assessment tool for CBI drainage fluid is scientific and reliable, which can provide a basis for evaluating the CBI drainage fluid color, and can assist medical and nursing staff to quickly evaluate the drainage fluid color and find abnormal color scales.

OBJECTIVETo study the effect of seedling quality on growth, yield and quality of Rehmannia glutinosa at harvest and build a basis for its GAP.

METHODThe seedling quality of R. glutinosa in main producing regions was surveyed to understand the current status of seedling quality. Field experiments with different varieties and seedling quality were conducted to measure dry matter accumulation with different growth of R. glutinosa and oligosaccharide content, and economic yield at harvest.

RESULTThe seedling was randomly selected by farmers in R. glutinosa producing regions. Seedling quality could significantly improve on seedling emergence rate, and promote seedling growth, especially with early stage R. glutinosa, finally increase yield at harvest. At harvest, 63% and 50% of yield with A and B seedling could be improved for variety of 85-5, and 50% and 47% of yield could be increased for variety of Beijing No. 1, compared to the C seeding.

CONCLUSIONIn cultivation, the seedlings with the diameter > 1.5 cm should be transplanted firstly.

Oligosaccharides ; analysis ; Rehmannia ; chemistry ; growth & development ; Seedlings ; chemistry ; physiology

Mechanosensitive ion channels (MSCs) are key molecules in the mechano-electrical transduction of arterial baroreceptors. Among them, acid-sensing ion channel 2 (ASIC2) and transient receptor potential vanilloid subfamily member 1 (TRPV1) have been studied extensively and documented to play important roles. In this study, experiments using aortic arch–aortic nerve preparations isolated from rats revealed that both ASIC2 and TRPV1 are functionally necessary, as blocking either abrogated nearly all pressure-dependent neural discharge. However, whether ASIC2 and TRPV1 work in coordination remained unclear. So we carried out cell-attached patch-clamp recordings in HEK293T cells co-expressing ASIC2 and TRPV1 and found that inhibition of ASIC2 completely blocked stretch-activated currents while inhibition of TRPV1 only partially blocked these currents. Immunofluorescence staining of aortic arch–aortic adventitia from rats showed that ASIC2 and TRPV1 are co-localized in the aortic nerve endings, and co-immunoprecipitation assays confirmed that the two proteins form a compact complex in HEK293T cells and in baroreceptors. Moreover, protein modeling analysis, exogenous co-immunoprecipitation assays, and biotin pull-down assays indicated that ASIC2 and TRPV1 interact directly. In summary, our research suggests that ASIC2 and TRPV1 form a compact complex and function synergistically in the mechano-electrical transduction of arterial baroreceptors. The model of synergism between MSCs may have important biological significance beyond ASIC2 and TRPV1.

Mechanosensitive ion channels (MSCs) are key molecules in the mechano-electrical transduction of arterial baroreceptors. Among them, acid-sensing ion channel 2 (ASIC2) and transient receptor potential vanilloid subfamily member 1 (TRPV1) have been studied extensively and documented to play important roles. In this study, experiments using aortic arch-aortic nerve preparations isolated from rats revealed that both ASIC2 and TRPV1 are functionally necessary, as blocking either abrogated nearly all pressure-dependent neural discharge. However, whether ASIC2 and TRPV1 work in coordination remained unclear. So we carried out cell-attached patch-clamp recordings in HEK293T cells co-expressing ASIC2 and TRPV1 and found that inhibition of ASIC2 completely blocked stretch-activated currents while inhibition of TRPV1 only partially blocked these currents. Immunofluorescence staining of aortic arch-aortic adventitia from rats showed that ASIC2 and TRPV1 are co-localized in the aortic nerve endings, and co-immunoprecipitation assays confirmed that the two proteins form a compact complex in HEK293T cells and in baroreceptors. Moreover, protein modeling analysis, exogenous co-immunoprecipitation assays, and biotin pull-down assays indicated that ASIC2 and TRPV1 interact directly. In summary, our research suggests that ASIC2 and TRPV1 form a compact complex and function synergistically in the mechano-electrical transduction of arterial baroreceptors. The model of synergism between MSCs may have important biological significance beyond ASIC2 and TRPV1.
Acid Sensing Ion Channels/physiology* ; Animals ; HEK293 Cells ; Humans ; Pressoreceptors/physiology* ; Rats ; TRPV Cation Channels/physiology*