Environmental pollution could affect human health.The valuation on economic health loss due to environmental pollution could assist environment management to set more efficient environment policy.Contingent valuation method(CVM)is the worldwide used method to value loss caused by environmental pollution.CVM is a state preference non-market valuation method,which can flexibly assess the full economic value of public goods.CVM has been rarely used in environmental health loss valuation in China.Economic theory,application technique of CVM and it's potential bias was reviewed and discussed in this paper.Compared with the other methods,it could be concluded that CVM is a promising tool to value health loss by environment pollution in China.

Objective To investigate the methods of the design of multimedia didactic courseware of network on image diagnosis and its characteristic. Methods Based on the teaching material of “image diagnosis”, the images were collected with computers and scanners, and processed with graphic software, and then the multimedia didactic courseware was designed with Frontpage. Results The design of multimedia didactic courseware of network has been completed. Domain name has been applied. Part of the courseware has been passed to the website. Conclusion Multimedia didactic courseware of network, with bright prospects, is superior in agility of didactic style, in abundance of content, and in timeliness of information.

Objective To compare the influence of the continuous airway humidification with microp-ump and the discontinuous dripping technique on patients. Methods Randomized grouping method was adopted, 25 cases with tracheotomy in the observation group used continuous airway humidification with micro-pump, 24 cases in the control group used dripping technique via airway for airway humidification. The two groups were compared retrospectively. Results The oxygen saturation rate in the observation group increased compared with that of the control group, sputum callus formation, irritating cough, airway bleeding and pul-monary infection was significantly lower than those of the control group. Condusious The effect of continu-ous airway humidification with micro- pump is superior to the traditional method of inconsistent endotracheal dripping, the former can also decrease nursing workload of airway humidification.

Ojective To study the pathological changes of testis tissue in SARS patients.Methods Tissue specimens were studied by HE staining、TUNEL and immunohistochemistry(IHC).Results SARS patients showed that widespead germ cells destruction,few or no spermatozoon in the seminiferous epithelium and the lumen,thickened basement membrane、 peritubular fibrosis、 vascular congestion and leukocytes infiltration.The apoptotic seminiferous cells increased significantly(P

Objective To investigate the clinical value of routine MRI and functional imaging modality in the diagnosis of neonatal hypoglycemic encephalopathy.Methods Twelve diagnosed cases of neonatal hypoglycemic encephalopathy were obtained.Routine MRI sequence and DWI and SWI were performed in all cases.The MRI findings of each sequence as well as the sensitivity and the effect of each sequence were analyzed.Results The lesions were mainly located in corpus callosum (1 2 cases)followed by white matter of occipital lobe,frontal lobe and temporal lobe.Bilateral symmetrical distribution was found in 6 cases.The lesions were manifested as dot and flake like shape with different sizes,low signal intensity in T1WI,high in T2WI,bright in DWI and low in ADC maps and low SWI signal lesions.The total number of lesions in each sequence were displayed as follows:31 lesions in DWI,10 lesions in FLAIR,9 lesions in T2WI,6 lesions in T1WI and 5 lesions in SWI.The signal values were 1 898.30±290.46 and 933.71± 450.34 in T2WI and DWI respectively.The signal to noise ratio in T2WI and DWI were 9.28±5.73 and 22.40±15.59 respectively, and the DWI contrast signal ratio was significantly higher than that of T2WI (F=7.48,P=0.012).Conclusion The signal features and distribution of MRI in neonatal hypoglycemic encephalopathy are characteristic.DWI is more sensitive than other sequences in displaying lesions and SWI sequence could detect micro hemorrhagic foci.MRI routine sequence with function imaging is a valuable method for the diagnosis of neonatal hypoglycemic encephalopathy.