Objective:It proposed a new arithmetic of medical image coding based on the lifting scheme wavelets and the set partitioning in hierarchical trees. Methods: Due to the computational complexity of the traditional wavelet, the lifting scheme, which could speed up the fast wavelet transform, was adopted instead of the traditional wavelet transform. With the comprehensive utilization of SPIHT and arithmetic coding, it could achieve to code medical images. Results: At a range of compression ratio, the peak signal to noise ratio was markedly improved, and it could ensure the quality of the reconstruction of medical image to meet the medical image data storage and transmission needs. Conclusions: The simulation experiments show that at the same bit rate, the peak signal to noise ratio is markedly improved.

AIM To express recombinant human cytochrome P450 3A4 mutants CYP3A4.3, CYP3A4.4, CYP3A4.5 and CYP3A4.18, and to employ them for in vitro metabolism studies of CYP3A4. METHODS Use Bac-to-Bac baculovirus expression system to recombinant baculovirus carrying cDNA of CYP3A4 mutants CYP3A4.3, CYP3A4.4, CYP3A4.5 and CYP3A4.18. Spodoptera frugiperda 9 (Sf9), cells were co-infected by recombinant viruses of CYP3A4 mutants, human NADPH-P450 oxidoreductase and cytochrome b5 to obtain recombinant proteins CYP3A4.3, CYP3A4.4, CYP3A4.5 and CYP3A4.18 with metabolic activity. RESULTS The mRNA transcription of CYP3A4 mutants in Sf9 cells were validated by RT-PCR. Testosterone and 7-benzyloxy-4-(trifluoromethyl) coumarin were metabolized by the lysates of Sf9 cells infected by the recombinant viruses. CONCLUSION CYP3A4 mutants CYP3A4.3, CYP3A4.4, CYP3A4.5 and CYP3A4.18 with metabolic activity were successfully expressed by baculovirus-insect cell expression system. The results indicated that recombinant CYP3A4. 5 showed lower activity comparing to the wild type protein towards testosterone, while CYP3A4. 18 with higher activity, and for CYP3A4.3 and CYP3A4.4 showing similar activity to the wild type protein.

Objective To investigate the effect of ultrashortwave diathermy on pulmonary hypertension in patients with chronic cor pulmonale(CCP), and its mechanism. Methods Eighty-seven cases of acute phase CCP were divided into 2 groups: an ultrashortwave treatment group, in which 45 patients were treated with both ultrashortwave diathermy and conventional treatment; and a control group, in which 42 patients received regular treatment. The plasma levels of VEGF, ET-1 and the PaO_2, mPAP and FEV1.0 in the two groups were measured before and after treatment. Results In contrast to the control group, the FEV1.0 and PaO_2 of the experimental group were remar-kably increased, while their VEGF, ET-1 and mPAP were significantly decreased after treatment. VEGF and ET-1 were negatively related to PaO_2, and positively related to mPAP. Conclusions Ultrashortwave therapy is effective in treating pulmonary hypertension in patients with CCP. The mechanism for this may involve the synthesis and release of VEGF and ET-1.

Objective To discuss the apparatus of inspired oxygen in hyperbaric oxygen(HBO)chamber for patients after tracheotomy.Methods Many kinds of apparatus of inspired oxygen were analyzed,including composition,usage and characteristics.Results The apparatus of inspired oxygen play an active role in treating patients.But in the above apparatus,there are great differences in serving range,efficiency of inspired oxygen,curative effect,reliability and so on.Conclusions When serious patients after tracheotomy are treated in HBO chamber earlier,it is very important to select reasonable apparatus.

This paper introduces the current situation of hyperbaric oxygen (HBO) therapy, the environment characteristics in HBO chamber and the qualification of sputum aspirators. What's more, this paper also describes the construction, principles and characteristics of all kinds of sputum aspirators in HBO chamber. When critical patients are treated in HBO chamber, it is very important to select reasonable sputum aspirators.

0.05).Histopathological examination showed no pathological change in the brain,liver,kidneys,and spleen of the mice,but reduced spermatogenic cells spermatozoa.The sperm motility was(40.58?7.75)% in the control,(7.40?1.06)% in the experiment group 1(q=16.909,P0.05).No significant difference in the sperm densities was found among the groups.Conclusions Intermediated alternating magnetic field has adverse effects on the reproduction of mice.Testosterone is one of the target organs of electromagnetic radiation.It is sensitive to IF magnetic field(40 kHz,28 mT).Blood,brain,liver,kidney and spleen of mice are not effected by IF alternating magnetic field.

Objective To examine the heating capability of thermoseeds in isolated hepatic tissues.Methods Isolated hepatic tissues were heated uniformly to 37 ℃,meanwhile the thermoseeds and thermocouples were planted using a template paralleling with the magnetic line.Afterwards,the tissues were treated in an extracorporeal magnetic field of 120-123 gauss at a frequency of 113-116 kHz for 30 minutes.At the meantime,the temperature was recorded by a computer through thermocouples. Results The temperature of the tissues raised markedly with a largest change of 14 ℃.The heating area became hard and showed a gradual change of color(white-yellow-brown).The final temperature was negatively correlated with distance when using same number of the thermoseeds(r=-0.96017 to-0.99767,P=0.0023 to 0.0398),and positively correlated with the number of thermoseeds when measuring at a same point(r=0.93775 to 0.99270,P=0.0007 to 0.0185)except for the center group(r=0.93936,P=0.0606).Conclusions Thermoseeds inductive heating technology can achieve an appropriate temperature in isolated hepatic tissues.In certain extent,the temperature increase the number of thermoseeds and heating distance.

Objective: To investigate the change of functional marker and morphology of vascular endothelium induced by simulating diving condition. Methods:14 rabbit were put in the chamber. They stayed for 35 min under 0.55 MPa, and another 35 min under 0.7 MPa, then decompressed to 0.1 Mpa following a stage decompression schedule. Blood sample were draw at 30 min before compression and after decompression for testing endothelin-1(ET-1) and von Willebrand factor (vWF). These parameters were compared to see the change from pre-compression to post-decompression. The morphological change of vascular endothelium was observed under electrical microscope after decompression. Results: After decompression, plasma levels of ET-1 was increased from (1.33?0.23)ng/L to (2.99? 0.35)ng/L and activity of vWF was reduced from (2.35?0.47)% to (1.89?0.34)%. Swelling and defluvium of vascular endothelium was found under electrical microscope. Conclusion: Compression-decompression can cause the damage of vascular endothelium.

BACKGROUND: Researches suggest that ginseng saponin (GS) has protective effect on central nerve, but the effect on spinal nerves is reported rarely.OBJECTIVE: To investigate the relationship between effect of GS on spinal nerve and level of nitrogen monoxide (NO) and its mechanism.DESIGN: Randomized controlled animal study.SETTING: Military Hyperbaric Oxygen Center of Navy General Hospital of Chinese PLA.MATERIALS: The experiment was completed at Clinical Anatomy Institute (National Key Laboratory) of the First Military Medical University of Chinese PLA in 2000. Forty SD foetus rats with 15-day conception were selected.METHODS: Study Ⅰ: Embryo-spinal nerve cells of SD rats were separated, extracted and modeled with DMEM/F12 culture medium. On the fourth day of inoculated culture, axon of spinal nerve (simulation of peripheral nerve injury) was damaged with scarification method in injury group, but that in non-injury group was not treated. 150 μL cell culture medium and 100 mg/L Griess solution were mixed at 0, 0.5 1, 1.5, 2, 2.5, and 3 hours after injury respectively. Absorbency (A) was assayed with Σ960 (λ=570 nm) enzyme-linked immunoadsordent assay (ELISA) symbolic device 10 min-utes after reaction at room temperature. Study Ⅱ: Embryo-spinal nerve cells of SD rats were separated and extracted. Those in the experimental group were treated with GS + DMEM/F12 culture medium, but with DMEM/F12 culture medium in the control group. A value was assayed with the same method.MAIN OUTCOME MEASURES:① Relationship between injury of spinal neurons and level of NO;② Relationship between protective effect of GS and level of NO.RESULTS:① Relationship between injury of spinal neurons and level of NO: In the injury group, NO secretion was increased after injury of spinal neurons, reached peak 2 hours later, and decreased 3 hours later. There was significant difference as compared 0.5 hour with 0 hour (P ＜ 0.01),and also there was significant difference as compared 2 hourswith 0 hour (P ＜ 0.01).② Relationship between protective effect of GS and level of NO: In the control group, A value was increased with time passing, reached peak 2 hours later, and decreased 3 hours later; but A value in the experimental group was not changed generally. There was significant difference between the two groups at 2-hour point (P ＜ 0.01).CONCLUSION: NO liberation is increased after peripheral nerve injury.GS can inhibit NO liberation so as to protect peripheral nerve.

CpG motifs are unmethylated oligodeoxynucleotides,and its core sequences are composed of unmethylated cytosine and unmethylated guanine.CpG motifs can induce the immune response by activating a variety of immune cells against diseases.The changes of CpG structure will increase the biological activities of CpG,and then enhance the therapeutic effect of CpG as the immuno adjuvant and the sensitizer of radiotherapy and chemotherapy in cancer treatment