A magnetoelastic Staphylococcus aureus (S.aureus) wireless sensor was fabricated to detect S.aureus in different liquid medium.After 0.2 mL bacteria with proper concentration was taken into the tes ting cuvette containing 2 mL liquid medium, the resonance frequency of magnetoelastic sensor changed with the bacteria growth.Via changing the concentration of beef extract and peptone, sensor had the most frequen cy response in culture medium CM2-2 incubated with 2 × 10~5 cells/mL S.aureus.The results indicated that this sensor can be used to determine S.aureus concentrations of 3 × 10~3 to 2×10~7 cells/mL in culture medium and 10~4 to 10~7 cells/mL in milk, with the detection limits of 10~3 cells/mL and 104 cells/mL, respectively.The sensor frequency shift was correlated to the logarithmic value of the S.aureus concentration, and the correlation coefficient was 0.98 in milk and 0.99 in culture medium.

Objective To explore the value and methods of echocardiographic application in percutaneous left atrial appendage(LAA) closure for stroke prevention in patients with nonvalvular atrial fibrillation.Methods 6 male patients with nonvalvular atrial fibrillation were enrolled for percutaneous LAA closure,the mean age was (68.7 ± 5.6) years old,the mean CHADS2 (congestive heart failure,hypertension,age≥75 years,diabetes mellitus,and prior stroke or transient ischemic attacks) score was 3.2 ± 1.0.Rheumatic valvular diseases were excluded by transthoracic eehocardiography(TTE) before closure procedure.Transesophageal echocardiography(TEE) was performed to guide the punctures of the atrial septum and then monitored the operation all through the closure procedure.Diameter of LAA orifice was measure by TEE to help choosing the closure device.Immediate results of closure and complications were inspected by TEE simultaneously.24 hours,7 days,3 months,6 months and 1 year follow-up were performed using TTE.Results All the 6 patients underwent LAA closure successfully.3 LAmbre(Lifetech Scientific,Shenzhen) devices and 3 Watchman(Boston Scientific,Natick,Massachusetts) devices were implanted respectively in the 6 patients.Mean diameter of the LAA orifice was (22.4 ± 3.3)mm,and mean size of the closure devices was (28.0 ± 2.9) mm.2 mm in width residual flow at the inferior edge of closure device existed in 1 ease.No complication was observed.Post-procedure 24 hours and 7 days post-procedure followup showed optimal results in all cases.Conclusions Implantation of both LAA closure devices can be performed with high success rates in patients with nonvalvula ratrial fibrillation,with high risk for stroke,and who either had contraindication or were not willing to accept oral antieoagulation.Echocardiography plays a core role all through the closure procedure and can make it safer and more efficient.

A 22-year-old patient was admitted to the hospital with a solitary,gradually growing and painless mass in the left shoulder for 2 years.Physical examination revealed no abnormality except for the skin lesion.Skin examination showed an elevated lesion measuring about 3.5 cm× 2.0 cm × 1.5 cm with smooth surface and normal color,which was located in the subcutaeous tissue,indurated and movable.Resection of the tumor was performed under local anesthesia.On visual observation during operation,the tumor was sited in the subcutaneous fat tissue,nodular-like and surrounded locally by fibrous pseudocapsules with a grey incisal surface and mild texture.Microscopicalty,the tumor was extremely similar to breast fibroadenoma with multiple lobuli,and each of the lobuli was composed of tubiform structures,basal cell-like epithelial cell trabs and fibromyxoid stroma abundant in fibroblast-like spindle cells.No hair bulb or primitive dermal papillae were observed in the lobuli,which were separated by compact collagen fibers infiltrated by a few scattered inflammatory cells.Fibromyxoid strotma was surrounded by basal cell-like epithelial cell strabs in most lobuli,and some tubiform structures were filled with a little thin lightly eosinophilic material in a concentric arrangement.Immunohistochemistry showed that intralobular epithelial cells were strongly positive for cytokeratin 5/6,but negative for CAM5.2 or carcinoembryonic antigen (CEA).In addition,the lightly eosinophilic material in lumens was negative for periodic acid-Schiff (PAS) staining.These results suggested that the tubiform structures were immature follicles,but not sweat ducts.The patient was diagnosed with nodular fibrofolliculoma (NFF) based on the clinical manifestations,morphological features,immunohistochemical and PAS staining results.No relapse was observed in more than 3 months of postoperative follow-up.As a benign trichogenic adnexal neoplasm with unique clinicopathological manifestations,NFF may be a new entity of cutaneous adnexal neoplasm.

OBJECTIVE: To compare the efficacy and muscle injury imaging between oblique lateral lumbar interbody fusion (OLIF) and transforaminal lumbar interbody fusion (TLIF) in the treatment of single-segment degenerative lumbar spinal stenosis. METHODS: The clinical data of 60 patients with single-segment degenerative lumbar spinal stenosis who underwent surgical treatment from January 2018 to October 2019 was retrospectively analyzed. The patients were divided into OLIF groups and TLIF group according to different surgical methods. The 30 patients in the OLIF group were treated with OLIF plus posterior intermuscular screw rod internal fixation. There were 13 males and 17 females, aged from 52 to 74 years old with an average of (62.6±8.3) years old. And 30 patients in the TLIF group were treated with TLIF via the left approach. There were 14 males and 16 females, aged from 50 to 81 years old with an average of (61.7±10.4) years old. General data including operative time, intraoperative blood loss, postoperative drainage volume, and complications were recorded for both groups. Radiologic data including disc height (DH), the left psoas major muscle, multifidus muscle, longissimus muscle area, T2-weighted image hyperintensity changes and interbody fusion or nonfusion were observed. Laboratory parameters including creatine kinase (CK) values on postoperative 1st and 5th days were analyzed. Visual analogue scale(VAS) and Oswestry disability index(ODI) were used to assess clinical efficacy. RESULTS: There was no significant difference in the operative time between two groups(P>0.05). The OLIF group had significantly less intraoperative blood loss and postoperative drainage volume compared to the TLIF group(P<0.01). The OLIF group also had DH better recovery compared to the TLIF group (P<0.05). There were no significant differences in left psoas major muscle area and the hyperintensity degree before and after the operation in the OLIF group (P>0.05). Postoperativly, the area of the left multifidus muscle and longissimus muscle, as well as the mean of the left multifidus muscle and longissimus muscle in the OLIF group, were lower than those in the TLIF group (P<0.05) .On the 1st day and the 5th day after operation, CK level in the OLIF group was lower than that in the TLIF group(P<0.05). On the 3rd day after operation, the VAS of low back pain and leg pain in the OLIF group were lower than those in the TLIF group (P<0.05). There were no significant differences in the ODI of postoperative 12 months, low back and leg pain VAS at 3, 6, 12 months between the two groups(P>0.05). In the OLIF group, 1 case of left lower extremity skin temperature increased after the operation, and the sympathetic chain was considered to be injured during the operation, and 2 cases of left thigh anterior numbness occurred, which was considered to be related to psoas major muscle stretch, resulting in a complication rate of 10% (3/30). In the TLIF group, one patient had limited ankle dorsiflexion, which was related to nerve root traction, two patients had cerebrospinal fluid leakage, and the dural sac was torn during the operation, and one patient had incision fat liquefaction, which was related to paraspinal muscle dissection injury, resulting in a complication rate of 13% (4/30). All patients achieved interbody fusion without cage collapse during the 6- month follow-up. CONCLUSION Both OLIF and TLIF are effective in the treatment of single-segment degenerative lumbar spinal stenosis. However, OLIF surgery has obviously advantages, including less intraoperative blood loss, less postoperative pain, and good recovery of intervertebral space height. From the changes in laboratory indexes of CK and the comparison of the left psoas major muscle, multifidus muscle, longissimus muscle area, and high signal intensity of T2 image on imaging, it can be seen that the degree of muscle damage and interference of OLIF surgery is lower than that of TLIF.
Male ; Female ; Humans ; Middle Aged ; Aged ; Aged, 80 and over ; Retrospective Studies ; Spinal Stenosis/surgery* ; Blood Loss, Surgical ; Lumbar Vertebrae/surgery* ; Spinal Fusion/methods* ; Treatment Outcome ; Pain, Postoperative ; Muscles ; Minimally Invasive Surgical Procedures/methods*

With the rapid development and expansion of the scale of the industry of Chinese materia medica,a large number of by-products in the process industrialization of Chinese materia medica have been produced,among which,the solid by-products of Chinese materia medica have been favoured by researchers due to the fact that they are rich in a large number of proteins,cellulose,hemicellulose,lignin,etc.,which can be used in the preparation of high value-added products.Therefore,the authors elaborated on the research on biochemical conversion,thermochemical conversion,resource oriented chemical components,preparation of biomass fuel,new composite materials and high-efficiency adsorbent of solid by-products in the process of industrialization of Chinese materia medica in recent years,aiming to provide theoretical basis for the comprehensive and high-value utilization of the solid by-products of Chinese materia medica and extension of the industrial chain.