Nerve agents (NAs) belong to the class of organic phosphorus compounds which are acetylcholinesterase ( AChE) inhibitors, including soman, sarin, tabun,VX, etc.NAs are extremely toxic and considered as the most danger-ous chemical warfare agents.The current standard treatment for poisoning by nerve agents consists of the combined adminis-tration of anticholinergic drugs such as atropine sulphate, AChE reactivators such as pralidoxime, obidoxime and HI-6 and diazepam for anticonvulsant effects, but oximes are therapeutic antidotes against nerve agent intoxications which exert the therapeutic purposes primarily by reactivating the NAs-inhibited AChE.In this paper, the mechanism of nerve agents, the main working procedure of anti-NAs drugs, the chemical structure of classic reactivator, the corresponding antitoxic action, in vivo and in vitro effects and metabolic kinetics are reviewed.

Pathological types of gastric cancer in stage Ⅲ C include T4a-SEN3,T4b-SIN2,T4b-SIN3.Celiac artery metastatic lymphadenopathy fused into blocks,usually from bottom to top.Limited operation space revealed anatomical and pathological factors,the dissection of the celiac artery lymph nodes,processing the left gastric artery root difficulty.Application of novel celiac artery lymph nodes dissection path,avoiding the limitation of the celiac artery lymph node dissection space exposure factors,so that the dissection of the celiac artery lymph nodes is more complete,processing the left gastric artery root easily,reduce the amount of bleeding,shorten operation time,increase the average lymph node dissection and the Ⅲ C gastric cancer resection rate.

Purpose　To inquire into the clinical and pathological features of subcutaneous panniculitis-like T-cell lymphoma. Methods　The histopathology and immunophenotypes of subcutaneous panniculitis-like T-cell lymphoma in 8 cases were observed. Results　Clinically one or more subcutaneous nodules were first found, then the lesion infiltrated up to the epiderm or down to the fascia. Half of the cases were stable for long time without systematic symptoms. The others got high fever with bone marrow, lymphonode involvement, had tumescent liver, and spleen, and decreasing of the counts of thrombocytes or whole blood cells. A few were accompanied with lethal hematophage syndrome. Some rapidly advanced and died less than 3 years. Pathologically, atypical large, midium-size and small lymphocytes with variable ratio rounded the lipocytes like rosettes and were confluent to small patchs or foci or formed a reticular pattern. There were many karyokineses and karyorrhexis made of distinct karyorrhexis bodies. The histocytes reactively proliferated accompanied with phagoerythrocytic phenomena, and polynuclear giant cells and granulomatoid reaction were found. The tumor cells infiltrated in the lipolubules. They expressed T-cell immunophenotype. Conclusions　This tumor is a special type of skin lymphoma involving subcutaneous fat tissue and special clinicophathological features.

Objective To observe the effect of neutralizing monoclonal antibodies to antiglomerular basement membrane (GBM) antibody on anti-GBM nephritis rats. Methods Wistar rats were randomly divided into five groups: control group Ⅰ was a negative control and was injected with healthy human IgG via the caudal vein. Control group Ⅱ was injected with neutralizing monoclonal antibodies to anti-GBM antibody only. Anti- GBM nephritis group was injected with human anti-GBM antibody via the caudal vein only. Intervention group Ⅰ was injected with human anti-GBM antibody via the caudal vein and then with neutralizing monoclonal antibodies to anti-GBM antibody at day 7. Intervention group Ⅱ was injected with human antiGBM antibody via the caudal vein and then with neutralizing monoclonal antibodies to anti-GBM antibody at day 14. The blood, urine and kidney tissue were collected at day 7, 14, 21 for analysis of 24-hour urinary protein, BUN, Ser and histological study. Results At day 21, there were significant decreases in intervention group Ⅰ compared with anti-GBM nephritis group in 24-hour proteinuria [(16.62±5.53) g], BUN[(11.53±2.26) mmol/L] and Scr [(102.46±16.86) μmol/L] (P＜0.05), and also in intervention group Ⅱ as compared to anti-GBM nephritis group, but no significant difference was found (P＞0.05) . There was obvious decrease of renal cell proliferation,crescent formation and deposition of immune complexes in intervention group Ⅰ and intervention group Ⅱ compared with anti-GBM nephritis group, while such improvement in intervention group Ⅰ was more significant. There was no significant change in control group Ⅰ and control group Ⅱ.Conclusion The early application of neutralizing monoclonal antibodies to anti-GBM antibodies can effectively improve the kidney lesions of anti-GBM nephritis rats.

Objective To establish a whole-body dynamic inhalation exposure system for toxicological studies on highly toxic chemicals, and to evaluate the safety and applicability of the system.Methods The safety and standardization of the laboratory were ensured after positive and negative pressure protection and airtight protection were finished.By modifying and optimizing the key technological units of the exposure chamber, the relationships between aerosol concentrations in the chamber and the push rate, exposure time and different monitoring points were investigated.Results and Conclusion Multi-protection was achieved, including the independent exposure chamber, negative pressure experiment and positive pressure protection under working conditions.The laboratory meets the demands of safety and specifications.The exposure aerosol concentrations in the chamber are uniform, stable and controllable while the air is dynamically flowing.The whole-body dynamic inhalation exposure system can meet the need for toxicological studies on highly toxic chemicals.

Objective To investigate the expression of CD44V6 in thyroid neoplasms and its significance. Methods The expression of CD44V6 in paraffin-embeded thyoid carcinoma tissue from 100 patients (50 with lymph node metastasis,50 without) and 20 patients with thyroid adenoma was measured by immunohistochemistry staining. Results Positive expression of CD44V6 in the group of thyoid carcinoma was 72%, significantly higher than the group of thyroid adenoma.Positive expression of CD44V6 in the group of thyoid carcinoma with lymph node involvement was 90%,significantly higher than the group of thyoid carcinoma without lymph node involvement.In patients with different pathological grade,different clinical stage and different survival time, the positive expression of CD44V6 was significantly different. Conclusions The results suggest that CD44V6 can be regarded as an valuable molecular markers to distinguish benign thyroid tumor from malignant tumor, to predict lymph node metastasis and prognosis.

As an important measure to reduce casualties and prevent secondary pollution, decontamination is an impor-tant link in the process of emergency response during chemical accidents.The decontamination effect is closely related to decontamination technology and equipment.Decontamination agent selection and development are an important part of a decontamination technology.In this paper, the development and use of cleaning agents, such as alkaline, oxidation and chlorination, adsorption (degradation), metal oxide and oxygen acid salt, chemical compounds, biological (enzymatic), and individual disinfection package, light decontamination equipment, multifunctional integrated large-scale decontamination equipment at home or abroad, are reviewed.By laying bare the gap between China and advanced countries in the related field, we hope to raise the concern of relevant professional counterparts and promote the development of domestic decontami-nation technology and equipment with decontaminant agents at the core.

OBJECTIVE To establish a model for chlorpyrifos(CPF)whole-body dynamic inhalation exposure in SD rats and investigate the injury effects after acute exposure by CPF. METHODS By optimizing the aerosol parameters ,the animal acute dynamic inhalation exposure of CPF was established. Absorption sampling-gas phase detecting technology was used to monitor the concentration of CPF in the whole-body dynamic-inhalation exposure cabin by exploring the relationship between the concentration , particle size of CPF aerosol and the CPF inhalation time in the exposure cabin via a particle size detector. Using Bliss method,specific pathogen free SD male rats were allocated to the environment of CPF exposure at different lethal concentrations and time points. The symptoms and deaths of these SD male rats in different groups were recorded within the following 10 d. Based on the median lethal concentra?tion time(LCt50),the values of plasma cholinesterase(ChE)were checked at different time points after being exposed at different doses. RESULTS The mean concentrations of CPF aerosol at nine time points was 160.6 mg · m-3,the relative standard deviation value was 6.9%;the geometrical mean of aerosol particle size was 1.1 μm,and the geometric standard deviation was 1.8. The results met the technical requirements of Organization for Economic Cooperation and Development regarding acute inhalation exposure. Under these equipment conditions,the LCt50 of CPF acute inhalation of SD male rats was 1654.2 mg · m-3 · h,suggesting that plasma ChE inhibitory rate was higher with the increase in the exposing dose,and that there was a significant difference as compared with the controls(P<0.05). CONCLU?SION The model for whole-body dynamic-inhalation exposure of CPF is applicable to rats,which can serve as an experimental platform and technical support to inhalation vulnerability and the research on prevention and cure of organophosphate industrial products and nerve agents.

Mercury is one of the common heavy-metal toxins,which can cause damage throughout the body in a variety of ways. Cases of renal toxicity of mercury poisoning are increasing clinically. However,little is known about nephrotoxicity mechanisms,and treatment remains unsatisfactory. The mechanism of mercury toxic nephropathy is reviewed in this paper,including the direct toxic effect on the kidney,the injury to the biomembrane system,generation of Hg-metallothionein,imbalance of intra?cellular calciumion,oxidative damage,induced apoptosis,and immune injury. Besides,the mechanism and limitation of common therapies,potential developments of the field are discussed. This review will facilitate further investigations therapies about both the mechanism and treatment of mercury toxic nephropathy.

″Tianjin Port 8 · 12 Catastrophic Explosion Accident″ affected the national people′s heart. After the disaster,the chemical defense,medical,explosion and so on various relevant profes?sional experts and rescue teams responded to the national call. Taking the bull by the horns,pooling the wisdom and efforts,the experts and rescue teams carried out and implemented the decision spirit of ″it should not hurt one man,and should not appear serious secondary disasters in the late treat?ment″which put forward by the Party Central Committee and State Council. In order to better learn and sum up experience,the cause of the disaster,the disaster rescue and disposal process,the enlighten?ment brought by the disaster and the recommendations deal with unexpected chemical incidents in the future was discussed in this paper.