Effect of Potassium Solubilizing Bacteria on Rhizosphere Soil Microenvironment of Paris polyphylla var. yunnanensis / 中国实验方剂学杂志

ObjectiveTo investigate the effects of the inoculation of potassium-solubilizing bacteria on the rhizosphere soil microenvironment of Paris polyphylla var. yunnanensis. MethodThe effects of different potassium-solubilizing bacteria on the physical and chemical properties， microbial community structure， and soil enzyme activity in the rhizosphere soil of P. polyphylla var. yunnanensis were investigated by pot planting at room temperature. The correlation of various indexes was analyzed. ResultThe inoculation with different potassium-solubilizing bacteria could significantly affect the physical and chemical properties of rhizosphere soil of P. polyphylla var. yunnanensis. The mass fractions of available nitrogen， available phosphorus， and available potassium were 24.5-90.5 mg·kg-1， 2.53-25.9 mg·kg-1， and 132-312 mg·kg-1， respectively， and the soil pH was 7.08-7.75， which were in line with the optimal ranges of P. polyphylla var. yunnanensis planting. The inoculation of different potassium-solubilizing bacteria could affect the number of bacteria， actinomycetes， and fungi in rhizosphere soil to varying degrees. The transformation of soil from "fungal type" to "bacterial type" marks the improvement of soil fertility. It also affected the enzyme activity of rhizosphere soil， and the activities of neutral phosphatase， protease， and polyphenol oxidase showed an increasing trend. The correlation analysis showed that the number of bacteria was negatively correlated with the number of fungi （r=-0.856， P<0.01）， positively correlated with the number of actinomycetes， the content of available nitrogen and available potassium， and negatively correlated with soil pH. ConclusionThe inoculation of potassium-solubilizing bacteria can effectively improve the content of available potassium， available nitrogen， available phosphorus， and other nutrients in the rhizosphere soil of P. polyphylla var. yunnanensis， improve soil fertility， alleviate the continuous cropping obstacles of P. polyphylla var. yunnanensis， and lay a theoretical foundation for the green and sustainable development of P. polyphylla var. yunnanensis.

Analysis of blood flow energy characteristics of pulsatile and non-pulsatile flow during extracorporeal circulation / 中华外科杂志

Objective@#To analyze the magnitude of blood flow energy and characteristics of frequency domain between pulsatile flow and nonpulsatile flow during cardiopulmonary bypass and physiological flow.@*Methods@#From January 2017 to December 2017, 60 cases of patients with mitral valve disease scheduled for mitral valve replacement or repair at Department of Cardiasurgery, Shanghai Chest Hospital, Shanghai Jiaotong University were randomly divided into 2 groups: pulsatile perfusion (PP) and non-pulsatile perfusion (NP). The magnitude of blood flow energy during pulsatile and non-pulsatile was calculated using energy equivalent pressure (EEP) and surplus hemodynamic energy (SHE) while fast Fourier transformation (FFT) was used to perform power spectral density analysis to identify the frequency domain characteristics between artificial and physiological flow (prior to CPB). The data was analyzed by analysis of variance or t test.@*Results@#At the different time-points after occlusion, the EEP and SHE in PP group were respectively 1.52 to 1.62 and 2.03 to 2.22 times higher than NP at the distal of artery filter. The power density analysis revealed that the blood flow energy of physiological pulsatile flow patterns was within 40 Hz and the ratio of low frequency energy was more than 90% before clamp. The spectral energy ratio of low frequency decreased in both group compared with physiological flow was more obvious in NP group at the radial artery. The ratio of estimated value of power density of PP and NP groups analysis showed the corresponding 0 to 5 Hz, 0 to 10 Hz, 0 to 40 Hz frequency range values measured at the radial artery and filter were 9.51, 4.68, 3.59 and 3.87, 2.69, 2.38 respectively after occulusion. In each frequency range, the energy of PP is higher than that of NP, and the lower the frequency, the greater the difference. The ratio of estimated value of power density of PP and NP groups for the three frequencies measured at the radial artery before and after occlusion were 2.86, 2.83, 2.75 and 14.70, 12.74, 9.85 respectively, and decreased significantly in NP group and low frequency energy. The ratio of estimated value of power density of PP and NP groups under the three different frequencies measured at the radial artery and filter were 26.35, 33.15, 37.36 and 37.41, 54.18, 56.64 respectively, in the conduction process from filter to radial artery, energy exhaustion is significant, especially in group NP.@*Conclusions@#The PP provides significantly more energy than the NP whereby the PP is closer to the physiological pulsatile on the energy frequency structure and attenuation characteristics, with mainly low frequency energy of 0 to 5 Hz and weak energy attenuation. The energy loss of non-pulsatile flow is obvious, especially the low frequency energy.

Analysis of complications in 61 extracorporeal membrane oxygenation cases / 中华外科杂志

<p><b>OBJECTIVE</b>To analyze the reason and treatment of the complications of 61 cases of extracorporeal membrane oxygenation (ECMO) in order to improve survival rate of ECMO treatment.</p><p><b>METHODS</b>ECMO records from January 2007 to December 2014 in Shanghai Chest Hospital were investigated retrospectively focusing on complications. There were included 43 male and 18 female patients, age 3 to 66 years. Indications for ECMO included post-operative low cardiac output, viral myocarditis, bridge to heart transplantation, acute respiratory distress syndrome and myocardial infarction. There were 49 cases of veno-arterial ECMO and 12 cases of veno-venous ECMO.</p><p><b>RESULTS</b>ECMO duration was 2 to 61 days. Among 43 patients, 37 patients weaned from ECMO successfully and 28 survived to discharge. Various complications occurred to 56 patients, including oxygenator plasma leakage(4 case times), circuit emboli (7), hemolysis (4), bleeding (34), infection (8), acute kidney injury (35), lower limb ischemia (8) and neurologic complications (6). There were 49 cases times of complications in survivors, while 61 cases times in death group. Bleeding (10 time cases) and acute kidney injury (33 time cases) happened in the death group. Progresses in ECMO technique had influences on complications in some parts. For instance, incidence of lower limb ischemia was 6/7 in cutdown cannulating group, but reduced to 2/42(4.8%) when semi-open technique was applied.</p><p><b>CONCLUSIONS</b>Complications in ECMO are relative to patients' outcome intimately. Appropriate prevention and treatment of complication play a major role in the success of ECMO support. The incidences of certain complications reduce significantly due to progresses of equipment and medical experiences.</p>

Crystal structure of cytotoxin protein suilysin from Streptococcus suis

Cholesterol-dependent cytolysins (CDC) are pore forming toxins. A prototype of the CDC family members is perfringolysin O (PFO), which directly binds to the cell membrane enriched in cholesterol, causing cell lysis. However, an exception of this general observation is intermedilysin (ILY) of Streptococcus intermedius, which requires human CD59 as a receptor in addition to cholesterol for its hemolytic activity. A possible explanation of this functional difference is the conformational variation between the C-terminal domains of the two toxins, particularly in the highly conserved undecapeptide termed tryptophan rich motif. Here, we present the crystal structure of suilysin, a CDC toxin from the infectious swine pathogen Streptococcus suis. Like PFO, suilysin does not require a host receptor for hemolytic activity; yet the crystal structure of suilysin exhibits a similar conformation in the tryptophan rich motif to ILY. This observation suggests that the current view of the structure-function relationship between CDC proteins and membrane association is far from complete.

Decreased inhibitory synaptic function in CA1 region of hippocampus of adult rats following global ischemia-reperfusion / 基础医学与临床

Objective To observe the effects of global ischemia-reperfusion on inhibitory synaptic function in hippocampal CAl region of adult rats.Methods Animals were randomly divided into three groups: sham-operation group(SH),ischemia-reperfusion 3 day(IR-3) and 7 day group(IR-7).Global ischemic episode was achieved by 4-vessel occlusion.Evoked inhibitory postsynaptic currents(eIPSCs) were recorded from CA1 pyramidal cells in hippocampal slices using whole-cell voltage-clamp.Results The eIPSCs amplitudes generated by lower stimulus intensities were significantly decreased in both IR-3 and IR-7 rats as compared with SH rats.Moreover,the rise time of eIPSCs in IR-7 group was significantly decreased as compared with SH group(P

Clinical Analysis of 1?024 Cases of Severe Head Injury / 昆明医科大学学报

There are 1?024 cases of severe head injury hospita lized． 917 of them were closed head injury (89, 55%), 107 of them were opening head injury(10.45%)． Results: good recover: 326(31.83%)．moderate disability: 185(18.07%), severe inability 139(13.50%), persistent vegetative state　59(5.75%), death 315 (30.76%)． Conclusion: The early diagn osis and treatment of sever head injury is beneficial to the outcome of these patients． Special trea tment to different phrase of severe head injury, especially the moderate hypothermia treatment, co uld improve the outcome of these patients．