ABSTRACT
A simple colorimetric method for detection of isocarbophos was developed based on the enhanced peroxidase-like activity of hemin. Hemin could catalyze the oxidation of peroxidase substrate 3,3′,5,5′-tetramethylbenzidine (TMB) by H2O2, which made TMB to lose one electron and caused reaction solution color changing from initial transparent to blue-green. Adding isocarbophos improved hemin affinity to substrates, which further enhanced peroxidase-like activity of hemin and made TMB to lose two electrons. The color of TMB solution was further changed from blue-green to yellow, and the degree of color change was proportional to the concentration of isocarbophos. Under the optimal conditions, the present analytical method for isocarbophos detection had a dynamic range from 2 μg/L to 100 μg/L with a detection limit of 1.2 μg/L (3σ). The selectivity assay demonstrated that other organophosphorus pesticides exhibited negligible interferences for isocarbophos detection. The application of the proposed method in the practical samples showed that the mean recovery of isocarbophos was in the range of 94.4％-113.0％, thus it could be widely applied to rapidly and sensitively detect isocarbophos in the agricultural products.
ABSTRACT
Objective To explore laboratory diagnosis tests for lupus anticoagulant associated by coagulation factors(F Ⅷ,F Ⅸ and F Ⅺ)deficiency.Methods We investigated the coagulation factors'activity,coagulation factors'antibodies,anticardiolipin antibodies,lupus anticoagulant and thrombin generation in thirteen patients of lupus anticoagulant associated by coagulation factors(F Ⅷ,F Ⅸ and F Ⅺ)deficiency,ten hemophilia A patients, forty-eight healthy people. In these thirteen patients,there were five patients with schizophrenia and had been taking chlorderazin for a long time,two patients with antiphospholipid syndrome, one patient with pemphigus, five patients in which causes of disease were unknown.Among these patients,two patients has haemorrhage,eleven patients don't have reduced.The antibodies of these coagulation factors and LA were positive.Six patients in this group were ACA poslhve,and seven patients were ACA negative.The lag time of eleven non-haemorrage patients with LA positive associated by F Ⅷ,F Ⅸ and F Ⅺ deficiency was(5.60±1.18)min,higher than that of control group which was(1.88±0.25)min.This differenee had statistically significant(t=10.05,P＜0.01).The time to peak was(8.11±1.91)min,significantly higher than that of control group which was (4.10±0.36)min(t=8.83,P＜0.01).The endogenous thrombin potential(ETP)was(1 640.87±higher than that of hemophilia A patients which was(38.50±6.20)%(t=9.77,P＜0.01).The time to peak of hemophilia A patients was(8.01±1.81)min,significantly higher than that of control group which Was(4.10±0.36)min(t=8.20,P＜0.01).The lag time of control group and hemophilia A patients was (1.88±0.25)min and(2.01±0.84)min,respectively.There was no significant difierence of the lag time between these two groups(t=1.26,P＞0.05).Conclusions Diseases like lupus anticoagulant associated bv coagulation factors(F Ⅷ,F Ⅸ and F Ⅺ)deficiency and inherited hemophilia should use APTT,PT,should be used as confirmation tests. LA and ACA may serve as indication test for identifying the causes of these diseases. ETP and ETP percentage are quite good parametem for predicting the bleeding risk of patients with LA positive associated by coagulation factors(F Ⅷ,F Ⅸ and F Ⅺ)deficiency.
ABSTRACT
AIM:To investigate the expression of GAP-43 mRNA and protein of the motor neurons in spinal cord following the brachial plexus avulsion injury.METHODS: In the present study,three kinds of models of brachial plexus avulsion injury were made: right C7 anterior root avulsion(group A),C7 anterior root avulsion with right C5-T1 posterior roots breaking(group B),right C7 anterior root avulsion with hemi-transect between C5 and C6 segment of spinal cord(group C).The expression of GAP-43 mRNA in anterior horn of spinal cord was detected at 14 days after operation by SYBR green quantification RT-PCR technique.The amounts of GAP-43 positive neurons in spinal cord were detected at 1,3,7 and 14 days after operation by immunohistochemistry technique.RESULTS: In control group,the expression of GAP-43 mRNA was very low in anterior horn.By 14 days after operation,the expression of GAP-43 mRNA was evidently up-regulated compared with control group.GAP-43 positive neuron was observed in control group at 1st day and 3rd day after operation.GAP-43 positive neurons appeared at 7th day and peaked at 14th day after operation.The expression of GAP-43 mRNA and protein were maximum in group C,group B was the lowest.CONCLUSION: The expression of GAP-43 mRNA and GAP-43 protein were up-regulated following brachial plexus injury.The expression of GAP-43 protein results from the recombination of proteins.GAP-43 is closely related to the axon regeneration and functional reconstruction.