BACKGROUND: Fluorescence molecular tomography (FMT) has become a fast developing molecular imaging technique. Noise is a challenge for FMT, and the influence of noise on molecular imaging remains unclear, OBJECTIVE: To investigate the influence of noise on imaging reconstruction based on the adaptive-mesh-based algorithm using an analytical solution.METHODS: In this paper, the influence of noise on FMT was studied based on the adaptive-mesh-based algorithm using an analytical solution.RESULTS AND CONCLUSION: By adding noise to the simulated data, the reconstruction results with different signal-to-noise ratio are obtained and discussed. The experiment results show that the adaptive-mesh-based algorithm is robust in the existence of noise.

Objective To analyze the correlation between electrocardiogram exercise stress test and coronary artery stenosis degree.Methods A total of 150 patients who performed electrocardiogram exercise stress test were selected,and then coronary angiography were performed within 2 weeks.The sensitivity,specificity,positive predictive value and accuracy of electrocardiogram exercise stress test for diagnosing coronary artery stenosis degree were analyzed.Results Compared with coronary angiography,the sensitivity,specificity,positive predictive value and accuracy of electrocardiogram exercise stress test for diagnosing coronary heart disease were 75％(48/64),74％ (64/86),69％(48/70) and 75％ (112/150),respectively,for diagnosing coronary artery disease were 31％ (19/62),42％ (37/88),27％ (19/70) and 37％ (56/150),respectively.Conclusions Electrocardiogram exercise stress test as a simple,feasible and noninvasive method,has a good concordance with coronary angiography and a high correlation with coronary heart disease,a low correlation with coronary artery disease.It can be used as a good way to screen patients with coronary heart disease.

Objective:To explore whether ginsenosides-Rb1 (Gs-Rb1)can relieve cardiomyocyte hypertrophy induced by endothelin-1 (ET-1)via protein kinase C (PKC)system.Methods:Cardiomyocytes of neonatal rat were random-ly divided into blank control group,Gs-Rb1 group,ET-1 group,Gs-Rb1+ET-1 group,ET-1+CHE (chelerythrine, PKC blocker)group and Gs-Rb1 +ET-1 +CHE group.After 96h intervention,cardiomyocyte surface area,total protein content,PKC activity,c-fos and p-c-jun expressions were measured.Results: (1)Cardiomyocyte surface area and total protein content in Gs-Rb1+ET-1 group were significantly lower than those of ET-1 group (P <0.05~<0.001),but not significant different with those of Gs-Rb1+ET-1+CHE group,P =0.569;(2)PKC activity in Gs-Rb1+ET-1 group was significantly lower than that of ET-1 group [(9.3±0.6)pmol·min-1 ·mg-1 vs.(14.1± 0.9)pmol·min-1 ·mg-1 ],but significantly higher than that of Gs-Rb1+ET-1+CHE group [(2.7±0.2)pmol· min-1 ·mg-1 ],P <0.001 all;(3)Expressions of c-fos and p-c-jun gene and protein in ET-1 group were significant-ly higher than those of blank control group (P <0.001 all);compared with ET-1 group,there were significant re-ductions in expressions of c-fos [mRNA/protein:(0.53±0.05/0.39±0.02)vs.(0.43±0.03/0.31±0.03)]and p-c-jun [mRNA/protein:(0.64±0.04/0.44±0.02)vs.(0.33±0.05/0.37±0.03)]in Gs-Rb1+ET-1 group and ex-pressions of c-fos [mRNA/protein:0.41 ± 0.05/0.31 ± 0.02]and p-c-jun [mRNA/protein:0.31 ± 0.05/0.36 ±0.03]in ET-1+CHE group (P <0.05 or <0.001),expressions of c-fos and p-c-jun gene and protein in Gs-Rb1+ET-1+CHE group were significantly lower than those of Gs-Rb1+ET-1 group and ET-1+CHE group (P <0.05 or<0.001).Conclusion:Gs-Rb1 can significantly inhibit cardiomyocyte hypertrophy induced by ET-1 and PKC system is one of pathways mediating this biological effect.

Using Mortierella isabellina as starting strain, mutagenized with UV,screened by selecting mutants resisting maleic hydrazide,a fatty acid dehydrogenase inhibitor, directly on gradient plate,a mutant M 80 overproducing Gamma Linolenic Acid (GLA) was obtained, which has much higher productive qualities than its parental strain Its dry cell weight reaches 25 10g/L,lipid yield 12 35g/L,and GLA yield 771 88mg/L

Objective:To explore the influence of chronic cobalt chloride (CoCl2 ) treatment on blood glucose and car-diomyocyte apoptosis in diabetic rats .Methods:In vivo MI model of rat was established using male GK diabetic rats and male Wistar rats (all weighing 200g~250g) .Blood glucose level was measured before model establishment .Af-ter successful operation ,rats were divided into six groups:Wistar sham operation group ,Wistar MI group ,Wistar MI + CoCl2 group ,GK sham operation group ,GK MI group and GK MI + CoCl2 group ,six rats survived in each group at least .After three weeks ,blood glucose level was measured and heart was excised ,expression of Caspase-3 apoptosis gene in ischemic necrosis area was measured .Results:(1) Compared with GK sham operation group and GK MI group on three weeks after operation ,there was significant reduction in blood glucose level [ (27.73 ± 2.58) mmol/L ,(27.87 ± 3.18) mmol/L vs .(16.3 ± 2.15) mmol/L] in GK MI + CoCl2 group ,P<0.05 both;(2) Compared with GK MI group ,there were significant reductions in optical density [ (0.84 ± 0.03) vs .(0.70 ± 0.03)] and mRNA ex-pression [ (0.64 ± 0.03) vs .(0.52 ± 0.03)] of Caspase-3 in GK MI + CoCl2 group ,P<0.05 both;(3) There were no significant difference in blood glucose level ,optical density and mRNA expression of Caspase-3 in Wistar MI group and Wistar MI + CoCl2 group , P>0.05 all .Conclusion:Chronic cobalt chloride treatment can decrease blood glucose level and reduce expression of Caspase-3 apoptosis gene in ischemic necrosis area in diabetic rats .

BackgroundFunctional near-infrared spectroscopy （fNIRS） is a new generation of imaging tool that can be used to assist the diagnosis of psychiatric disorders. However， whether the patterns of prefrontal cortex activation observed by fNIRS are specific for different psychiatric disorders remains to be explored. ObjectiveTo investigate the characteristics of prefrontal cortex activation in patients with depression， anxiety disorder， bipolar disorder and schizophrenia in verbal fluency task （VFT） using fNIRS. MethodsFrom September to December 2021， 39 patients with schizophrenia， 205 patients with depressive disorder， 212 patients with anxiety disorder and 77 patients with bipolar disorder meeting the diagnostic criteria of the Diagnostic and Statistical Manual of Mental Disorders， fifth edition （DSM-5） were recruited in the outpatient and inpatient department of West China Hospital， Sichuan University. fNIRS was used to monitor the prefrontal cortex hemodynamic changes of patients under VFT， and the clinical symptoms of patients were assessed by Symptom Checklist 90 （SCL-90） and Hypomania Checklist-32 items（HCL-32）. Differences in mean oxyhemoglobin （HbO₂） concentration and the initial slope from 2 to 7 second during VFT were compared among patients with different diseases， and the correlation between mean HbO₂ concentration/initial slope and clinical symptoms was analyzed by partial correlation analysis. ResultsThe concentration of HbO₂ in channel 4 （Z=2.828， P=0.028） and channel 6 （Z=2.912， P=0.022） in patients with depression were significantly higher than those in patients with schizophrenia. Patients with anxiety had significantly higher changes in mean HbO₂ concentration in channel 4 （Z=3.154， P=0.010）， channel 5 （Z=3.021， P=0.015）， channel 6 （Z=2.980， P=0.017） and of all channels （Z=2.881， P=0.024） than those of schizophrenia patients. There was a statistically significant difference in the initial slope of channel 3 between patients with depressive disorder and those with bipolar disorder （Z=2.691， P=0.039）. Among patients with bipolar disorder， the anger-hostility scores of SCL-90 were negatively correlated with the mean HbO₂ concentration changes in channel 4 （r=-0.505， P=0.004）， channel 6 （r=-0.390， P=0.004）， channel 15 （r=-0.546， P=0.002）， channel 16 （r=-0.550， P=0.002） and the mean HbO₂ concentration changes of all channels （r=-0.491， P=0.006）. ConclusionPatients with schizophrenia had lower activation in frontopolar and orbitofrontal region than patients with depression and anxiety disorder， and the initial slope of the right frontopolar， inferior frontal and orbitofrontal region in patients with depression is higher than patients with bipolar disorder. In addition， patients with bipolar disorder had less activation in the frontopolar and orbitofrontal lobe， the insular cover of Broca's area and the upper outer frontal cortex， and were more irritable and hostile. ［Funded by 1·3·5 Project for Disciplines of Excellence-Clinical Research Incubation Project， West China Hospital， Sichuan University （number， ZYJC21083）］