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Objective To investigate the expression of transmembrane protein 16A (TMEM16A)in the cochlea of guinea pigs and its relationship with the age-related hearing loss.Methods We used auditory brainstem response (ABR)to explore the changes of hearing in guinea pigs of different age (groups of 2 w,3 m,1 y,and D-galactose).The distribution and expression of TMEM16A in the cochlea were detected by immunofluorescence and Western blot.Results ABR threshold was gradually increased,with significant difference between D-gal and the other three groups (P <0.01).TMEM16A was expressed in the cochlear striae vascularis at different ages,and the expression increased with age before 1 y (P <0.05). However, its level was increased in D-gal group and significantly differed from that in 3 m and 1 y groups (P < 0.05 ).Conclusion The change in TMEM16A expression in the cochlear striae vascularis of guinea pigs may be related to age-related hearing loss.
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Objective To investigate the expression of transmembrane protein 16A (TMEM16A)in the cochlea of guinea pigs and its relationship with the age-related hearing loss.Methods We used auditory brainstem response (ABR)to explore the changes of hearing in guinea pigs of different age (groups of 2 w,3 m,1 y,and D-galactose).The distribution and expression of TMEM16A in the cochlea were detected by immunofluorescence and Western blot.Results ABR threshold was gradually increased,with significant difference between D-gal and the other three groups (P <0.01).TMEM16A was expressed in the cochlear striae vascularis at different ages,and the expression increased with age before 1 y (P <0.05). However, its level was increased in D-gal group and significantly differed from that in 3 m and 1 y groups (P < 0.05 ).Conclusion The change in TMEM16A expression in the cochlear striae vascularis of guinea pigs may be related to age-related hearing loss.
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Objective: To establish a new method for the quantitative analysis of multi-components by single-marker (QAMS) to simultaneous determine seven components in Chrysanthemum indicum. Methods: The chlorogenic acid was used as internal marker to calculate the relative correlation factors (RCF) of caffeic acid, luteolin-7-O-glucoside, 3,5-O-dicaffeoylquinic acid, buddleoside, luteolin, and apigenin by high performance liquid chromatography (HPLC). The repeatability of RCF was investigated. The contents of seven components were determined by the external standard method and QAMS respectively. Results: The reproducibility of RCF was perfect. The value calculated by QAMS was consistent with the external standard method. Conclusion: The QAMS method for simultaneously measuring the content of seven components is feasible and accurate to evaluate the quality of Chrysanthemum indicum.
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Objective: To establish a method of rapid analysis for simultaneous determination of oleanolic acid and ursolic acid in Chinese materia medica (CMM) of Verbena officinalis, Ligustrum lucidum, Prunella vulgaris, Hedyotis diffusa, Patrinia scabiosaefolia, Eriobotrya japonica, Crataegus pinnatifida, Chaenomeles Fructus papaya. Methods: The analyses of preparation were conducted by accelerated solvent extraction (ASE), methanol was used as solvent extraction, and the static extraction time was 6 min. Separation was carried out on Acclaim C30 Thermo column with acetonitrile and 0.2% acetic acid (85:15) as mobile phase, flow rate was 0.3 mL/min, and UV detection wavelength was set at 205 nm. Results: After 10 min sample extraction time, oleanolic acid and ursolic acid reached baseline separation, and no sample matrix was interfered, the linear correlation coefficient was over 0.999, the average recovery between 95.8% and 102.7%; Compared to Chinese Pharmacopoeia 2015, the determination of average mass fraction difference was 3.7% and 5.8%. Conclusion: This method is simple, fast, and suitable for the analysis of these drugs, and it can be used for content determination of oleanolic acid and ursolic acid for eight kinds of CMM.
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Objective To study the trend of accidental death among children under 5 years of age.Methods A survey on accidental death among children was performed in Guangzhou to compare the data from the national monitoring program on the deaths under five in the same period during 2001-2010.Data on mortality and causes of injures were adjusted by missing reports.Results Mortality rates on injuries were decreasing annually from 2001 to 2010.Comparing with 2001,the magnitude of the drop in mortality among the 0,1-4 and under 5 year groups were 72.02％,77.17％ and 74.66％ respectively,with statistically significant differences (P＝0.000).During the 10 years of observation,data showed a dropping trend (P＝0.000) of the mortalitics on drowning,traffic accident,suffocation and falling,especially on drowning and suffocation.The main causes of death were suffocation in the 0 year group,drowning in the 1-2-year group,traffic accident and poisoning in the 3-year group,traffic accident and falling in the 4-year group.The accidental deaths happened in ‘C area’ which including Huadu,Conghua,Zengcheng,Panyu and Nansha,with the total proportion of accidental death in Guangzhou as 75.69％.Conclusion The mortality of accidental deaths among children under 5 years of age in Guangzhou had been decreasing during 2001-2010,mainly owing to the practice of intervention programs on drowning and suffocation,suggesting the necessity of integrating the health education programs on accidental injury with the healthcare management system in children in the country,focusing on the suburban and county levels where economy was relatively undeveloped or with more floating population.