Assistive technology has been one of key words in the field of special education. It will also be new trend of special educational development. In the article, the authors firstly introduced the definition of assistive technology device and assistive technology service and discussed the relationship between assistive technology and educational technology, and special educational changes in technology and idea because of the use of assistive technology, at last, some suggestions to enhance the use of assistive technology were put forward.

Metallic cancellous screw is one of the fixation devices widely used for bone fractures. It has always been reported that many cases of internal fixation failed just because of screw loosening or pullout. The stability of fixation is associated with the pullout strength of screws. The pullout strength strongly depends on the geometrical design of the screw thread, the material and the insertion technique of the screw, and the bone mineral density of the insertion site of the screw.

BACKGROUND: Anterior cervical discectomy and fusion (ACDF) is a gold standard to treat degenerative cervical syndrome. However, with the increasing application and follow-up data of ACDF, its adverse effects have been shown. In the past 20 years,artificial cervical disc replacement has been widely used in clinic, and the therapeutic effect is favorable.OBJECTIVE: To assess the effect of cervical disc replacement versus ACDF for cervical radiculopathy or myelopathy.METHODS: A computer-based online search of Medline (1966/2009-06), Embase (1966/2009-06), CBM (2009-06) and CNKI(2009-06), as well as Cochrane Back Group, and Cochrane library were performed to collect randomized controlled trials of cervical disc replacement versus ACDF. Data were evaluated by RevMan4.2.2 for Meta analysis.RESULTS AND CONCLUSION: A total of 15 studies were included. Meta-analysis indicates that no differences were found in the mean operation time, mean blood loss, mean hospital stay, satisfaction rate, and complication between two groups; the reoperation rate of the disc replacement group was lower than ACDF group in two years postoperation; disc replacement group was more efficient in improving cervical function indexes than ACDF group, and the postoperative SF-36 scores were significantly more than ACDF group. Moreover, postoperative motion range of affected segment was significantly greater in the disc replacement group than the ACDF, and the motion rage of adjacent segment was significantly increased in patients underwent ACDF compared with disc replacement treatment. However, there may be bias, more randomized controlled trials are required.

A questionnaire survey on the awareness and knowledge about stroke was conducted in 392 residents of Fangzhuang community.The results showed residents in Fangzhuang had high awareness rate about stroke,the rates of knowing early symptoms of stroke were from 57.91％ to 79.08％.83.16％ (326) of residents knew to dial 120 or 999 at emergency.The community doctors were thought as the main resource of gaining the knowledge of stroke (78.32％ ).The results indicate that Fangzhuang community health service center plays an important role in health education and guidance for emergent management of stroke in the community.

Objective To observe the changes in acid-base balance and the contents of electrolytes in patients during liver transplantation to explore the relationship between such changes and ASA grading, and to look for an optimal anesthetic intervention. Methods Arterial pH, PaO_2, PaCO_2, HCO~-_3, BE, K~+, Ca~ 2+ , Na~+, and glucose were monitored in 89 patients undergoing liver transplantation at four specific periods: before anesthesia (T_0), after skin incision (T1), 10 minutes before reperfusion (T_2), and 10 minutes after reperfusion (T_3). Changes in blood acid-base and electrolyte parameters of the patients with different ASA status were compared. Result The pH and BE in ASA V patients was significantly lower at T_0, T_1, T_2 and T_3, and HCO~-_3 was lower in ASA V at T_3. The PaCO_2 in ASA V patients was significantly higher at T_0, T_1 and T_2. The Na~+ content in ASA V patients was significant higher at T_2 and T_3. At T_0 and T_1, the glucose level in ASA Ⅳ and Ⅴ were significant higher than in ASAⅢ. Significant differences in pH, PaCO_2, HCO~-_3, BE and glucose level were observed at different stages of the surgical procedure. The pH, BE and HCO~-_3 were significantly lowered at T_2 and T_3. Mean glucose and HR levels were gradually increased from T_1 to T_3. Conclusion Patients with advanced ASA grades are more prone to acid-base and electrolyte disturbances during reperfusion of the liver transplant. High ASA grades contitute an increased risk for cardiovascular collapse after reperfusion, calling for proper treatment.

Tuberculosis (TB) is an infectious disease caused by Mycobacterium tuberculosis complex and is mainly manifested as pulmonary tuberculosis. Mycobacterium tuberculosis is characterized by high pathogenicity and drug resistance due to its high viability and lethality, and multidrug-resistant tuberculosis caused by it has become a global public health problem. Early and effective treatment is essential to prevent the emergence of drug-resistant strains. Commonly employed methods for the screening and diagnosis of TB include: clinical signs, imaging examinations (chest X-ray, computed tomography), sputum culture (L-J medium, BACTEC liquid culture system), and immunological tests (lipoarabinomannan antigen test, tuberculin skin test, interferon-gamma release test). In recent years, emerging molecular diagnostic methods such as GeneXpert MTB/RIF assay, loop-mediated isothermal amplification (LAMP), linear probe assay, and whole-genome sequencing have been used to diagnose and characterize TB. These methods not only identify Mycobacterium tuberculosis but also detect mutation sites associated with resistance to first-line anti-tuberculosis drugs (isoniazid, rifampicin, etc.), providing new possibilities for the diagnosis of drug-resistant Mycobacterium tuberculosis. In this paper, the advantages and disadvantages of some commonly used detection methods for tuberculosis are first reviewed, aiming at assisting clinicians to diagnose and treat the disease in a timely manner. Secondly, this paper explores the prospects of the latest high-throughput detection methods for drug-resistant Mycobacterium tuberculosis.

OBJECTIVE:To observe therapeutic efficacy and safety of lansoprazole triple therapy in the treatment of Helicobacter pylori (Hp) associated gastric ulcer.METHODS:A total of 80 patients with Hp associated gastric ulcer were randomly divided into control group (40 cases) and combination group (40 cases).Control group was given Lansoprazole capsules 30 mg once in the morning or before bedtime,for 6 weeks.Combination group was given Lansoprazole capsules (same usage and dosage as control group)+Clarithromycin tablets 0.5 g,twice a day+Amoxicillin dispersible tablets 1 g,twice a day,for consecutive 1 week,and then given Lansoprazole capsules 30 mg once in the morning or before bedtime,for 5 weeks.Patients with amoxicillin allergy were switched to Metronidazole tablets 0.4 g,twice a day.Hp eradication rate of 2 groups were observed;recrudescence rate of Hp negative patients and the recurrence of effective patients were observed after 6,12 months of treatment.The leve1s of Th1 cytokines (IFN-γ,IL-2,IL-12) and Th2 cytokines (IL-4,IL-6,IL-10) were observed before and after treatment,and the occurrence of ADR was recorded.RESULTS:There was no statistical significance in total response rate of ulcer healing,Hp eradication rate or the incidence of ADR between 2 groups (P＞0.05).After 6 months of treatment,there was no statistical significance in recurrence rate between 2 groups (P＞0.05).The recurrence rate of combination group after 12 months of treatment and recrudescence rate of combination group after 6,12 months of treatment were significantly lower than those of control group,with statistical significance (P＜0.05).Before treatment,there was no statistical significance in Th1 type cytokines and Th2 cytokines between 2 groups (P＞0.05).After 1 week and 6,12 months of treatment,the levels of INF-γ,IL-2,IL-12 and IL-6 in 2 groups were significantly lower than before;the levels of INF-γ,IL-2 and IL-12 in combination group were significantly lower than control group after 12 months of treatment.After 1 week and 6,12 months of treatment,the levels of IL-4 and IL-10 in 2 groups were significantly higher than before;those indexes of combination group were significantly higher than those of control group after 12 months of treatment,with statistical significance (P＜0.05);but there was no statistical significance in the level of IL-6 between 2 groups (P＞0.05).CONCLUSIONS:Lansoprazole triple therapy shows significant therapeutic efficacy for Hp associated gastric ulcer,improve cytokines level and reduces recurrence rate and recrudescence rate without increasing the incidence of ADR.

This study was aimed to identify Bletilla Striata (Thunb.) Reichb.f.and Bletilla Formosana (Hayata) Schltr.by ITS2 sequence.The leaves of 38 samples of Bletilla striata and Bletillaformosana from Yunnan,Hubei,Guizhou,Hunan and Sichuan province were used as experiment materials.The total DNA was extracted.Internal transcribed spacer 2 (ITS2) sequences were obtained by PCR.All of the ITS2 sequences were checked.The 8 ITS2 sequences from two species were downloaded from GenBank.The intraspecific and interspecific Kimura-2-parameter (K2P) distances of Bletilla striata and Bletilla formosana were calculated by MEGAS.0.And neighbor-joining (NJ) tree was constructed.The results showed that the full-length sequences of ITS2 from Bletilla striata and Bletillaformosana were 259 bp,with a total of 14 variable sites.The maximum intraspecific K2P distance of Bletilla striata and Bletillaformosana was 0.008,while the minimum interspecific K2P distance was 0.040.The ITS2 secondary structure showed that different origins of Bletilla striata were gathered together and could be distinguished obviously from Bletilla formosana by NJ tree.It was concluded that ITS2 sequence was able to identify Bletilla striata and Bletillaformosana quickly and accurately.

Objective: To optimize and establish the best hydrolysis method of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate through the optimization of simple compound of diethyl N-(4-aminobenzoyl)-L-glutamate.Methods: To increase the low yield of hydrolysis reaction of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate due to the by-products and difficult purification, we studied the effect of NaOH and KOH, two kinds of alkalis, three concentrations between 0.175-1 mol/L and five types of reaction time involved in 20, 30, 60, 120 and 180 min on the common side chain diethyl N-(4-aminobenzoyl)-L-glutamate.A high performance liquid chromatography was established for measuring the target product and the by-products in reaction liquid in different reaction conditions.Finally, on the basis of the best hydrolysis method of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate, we completed the optimization of the hydrolysis reaction conditions of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate.Results: We developed the best reaction condition for the hydrolysis of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate, which could be carried out easily and efficiently.The results indicated that treated with the optimized condition of 0.3 mol/L KOH in 60 min at the room temperature, diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydrofolate was converted into its diacid derivative in 95.6 % yield, which turned to be a better reaction condition compared with the previous reaction condition.The structures of those compounds were identified to be correct by 1H nuclear magnetic resonance(1H NMR), 13C nuclear magnetic resonance(13C NMR) and electrospray ionization time of flight mass spectrometry (ESI-MS).The purity of the diacid derivative of the compound was determined to be 96% by high performance liquid chromatography(HPLC).The new hydrolysis reaction condition could not only avoid the formation of single ester hydrolysis product and amide bond hydrolysis product, but also improve the yield of the hydrolysis reaction.Conclusion: We have developed an efficient reaction for the hydrolysis of diethyl ester 4-amino-N5-formyl-N8,N10-dideazatetrahydro.Since the final step of the synthesis of classical folic acid antagonists is always the catalyzed hydrolysis of the side chain glutamate, the reaction also has great significance for anti-folic acid anti-tumor inhibitors synthesis.

Objective To investigate the protective effects of ethyl docosahexaenoate on brain oxidative injury and edema induced by cerebral ischemic/reperfusion in gerbils. Methods The gerbils were subjected to both common carotid arteries occlusion. The contents of MDA and GSH, the activities of GSH-PX, CAT, SOD and ATPase, the water content and the concentrations of Na + and Ca 2+ were measured. Histopathological examination was also done. Results The pretreatment with E-DHA significantly prevented the raise of MDA level, the decline of GSH content, the activities of GSH-Px, CAT, ATPase and the increases of Ca 2+, Na + and water content. Conclusion E-DHA has protective effect on brain ischemic injury and edema, which may be due to an inhibitory action on hydroxyl radical formation and brain edema.