Magnetic manipulation of particles/cells in microfluidic chips is a promising research field.This paper stated the operation mechanism and the main means of manipulation, including separation, concentration, capture, arrangement and assembly.Especially, the concept of particles/cells separation was emphasized with different criteria, like sizes, shapes, and magnetic properties.In addition, the effects of the channel geometry, the intensity and distribution of the magnetic field, and the types of magnetic liquid (paramagnetic salt solutions and ferrofluids) on the performance of the magnetic manipulation were also compared.The prospective to the prospect of magnetic manipulation about particles/cells in microfluidic chip was also depicted.

Objective: To select highly metastatic cells from human salivary gland mucoepidermoid carcinoma cell clone Mc3. Methods: In situ transplantation of Mc3 cells into submandibular gland of nude mice, in situ transplantation of Mc3 induced lung metastasized tumor tissue among nude mice and cell culture were employed to obtain the wanted cells. Morphological observation, cell growth analysis, flow cytometry, chromosome staining, clonogenic assay and artificial metastasis test in nude mice were used to characterize the cells. Results: Lung metastasis was observed in 3 out of 10 nude mice after 4 cycles of in situ transplantation of Mc3 cell induced lung metastasized tumor tissue. Epidermoid cells with similar morphology to Mc3 were obtained through cell culture and the cells were named M3SP4. M3SP4 cell induced lung metastatic foci were histologicaly proved to be mucoepidermoid carcinoma. Subdiploid karyotype with human chromosome morphology was observed in M3SP4 and Mc3 cells. The population doubling time (h) of M3SP4 and Mc3 cells was 23.9 and 25.9, the percentage of S phase cells in cell cycle 26.8 and 15.3, clonogenecity (%) 54.6 and 30.2, respectively. The artificial lung metastatic potential of M3SP4 cells was 35% higher than that of Mc3 in nude mice. Conclusion: M3SP4 cells are of human mucoepidermoid carcinoma with higher metastatic potential than Mc3. In situ transplantation of mucoepidermoid carcinoma cells or lung metastasized tumor tissue may maintain the metastatic potential of the cells.

For medical student, diagnostic practice is the first step of clinical study. To penetrate the humanities education in diagnostic teaching,the combination with practice from the following steps as physical examination, laboratory examination and interrogation, would cultivate medical students' humane quality imperceptibly and play an important role in creating noble medical ethics of them.

Objective Retrospectively investigate the application of anterolateral thigh flow-through flap in reconstruction of the extremities,to estimate its role and characteriscts.Methods From March,2010 to January,2016,anterolateral thigh flow-through flap was performed for reconstruction of the extremities in 87 patients (56 males,and 31 females).Patient ages ranged from 13 to 68 years,average of 34.4 years.Of all cases,there were 37 legs,21 ankles or foots,1 arm,19 forearms,and 9 hands.The role and result of anterolateral thigh flow-through flap was analyzed retrospectively.Results The result showed that when anterolateral thigh flow-through flap was transferred,which simutaneously played various roles as follows:①rebuilding main vascular defect,to revascularise the distal limb.② preserving recipient vessels,to prevent flow impaired.③rebulding recepient vessel defect.④ protecting vascular anastomosis and preserving recipient flow simultaneously.⑤avoiding the dilemma of end-to-side anastomosis when recipient vessels is deep.⑥ balancing blood flow,the blood supply of the flap was more stable.⑦ linking another tissue in a series fashion,to achieve complex reconstruction.Vascular compromise occurred in 3 cases after surgery,total necrosis occurred in 1 case and partial necrosis in 1 case after reexploration.One case presented deep infection and secondary with renal failure,and received amputation.Local infection presented in 3 cases,wound dehiscence in 2 cases.All the other flaps survivled uneventfully,and its texture and color was normal.In donor site,local infection occurred in 1 case,wound dehiscence in 2 cases.Conclusion Anterolateral thigh flow-through flap has function of many sided reconstruction,which is able to play a vital role in reconstruction of the extremities.

Surgical robots, as a new means for surgeons, have been gradually applied in orthopedics. Initially, the development of orthopedic robots was stagnant for a long time because of limited techniques available, clumsy equipment, high costs, and low market demands. The recent decade has witnessed rapid growth of artificial intelligence in all walks of life, increasing investment in research and development, reducing manufacture costs and expanding demands for precise and individualized medical treatment so that a wide variety of novel and ingenious robotic systems have been proposed, prototyped, and commercialized in most of the major procedures in orthopedic surgery, including knee and hip replacements, cruciate ligaments surgery, spine surgery, corrective osteotomy, bone tumor surgery, and trauma surgery. This review depicts the history of development and future prospects in application of surgical robots in the field of orthopedics.

Objective To explore the effect of ciliary,neurotrophic factor (CNTF)-coated polyglycolic and polylactic acid (PGLA) nerve conduits treated by pulsed plasma to repair canine tibial nerve defects. Methods A 2.5 cm long tibial nerve defect was made in eighteen cross-bred dogs.The nerve defects were re- constructed by three different methods:group A:pulsed plasma treated and CNTF coated PGLA nerve conduits (n=6);group B:PGLA nerve conduits alone (n=6);group C:nerve autografts (n=6).HE staining, Massons' trichrome staining,S-100 immunostaining,electrophysiological test and axon counting were used to evaluate the results of nerve regeneration in three groups.In addition,the dynamic walking pattern was recor- ded individually.The observation period lasted for three months.Results All nerve conduits were well vas- cularized and mostly degraded as well as absorbed.It was found that the regenerating axons could traverse all nerve conduits.In regard to nerve conduction velocity and axon counting there was no significant difference be- tween group A and group C (P＞0.05),while the data of group A and group C were significantly better than those of group B(P＜0.05).The dogs in group A and C recovered nearly normal walk pattern while those in group B were still crippled.Conclusion Pulsed plasm-treated and then CNTF-coated PGLA nerve conduits could effectively repair 2.5-cm-long canine tibial nerve defects,and the effect is similar to that of autografts.

Objective To explore the effect of erythropoietin (EPO) attenuating apoptosis in old rat hippocampal neuronal cells exposed to sevoflurane and the role of toll like receptor 4.Methods Twenty months old SD rats,male,550-750 g,in accordance with the random number table,were divided into 3 groups (n =9):control group (group C),sevoflurane treatment (group S),and sevoflurane plus EPO treatment (group ES).The rats in group S and ES were subjected to inhale 4％ sevoflurane for 6 h,but the rats in group C were inhaled air-oxygen only.The rats in group ES were injected with EPO into caudal vein at 24 h,48 h,and 72 h after sevoflurane exposure.The cognitive ability was assessed by Morris water maze test;the effects of hippocampal apoptosis were assessed by TUNEL assays;the expressions of TLR4 mRNA was measured by RT-PCR assay;mitochondrial membrane potential (MMP) was assessed by JC-1 fluorescence;the expressions of APP and Aβ were assessed by western blot.Results Compared with group C,there were significant increases of escape latency period,neuronal apoptosis,TLR4 mRNA,and APP and Aβ expression,but a decrease of MMP in group S (P＜0.05).Compared with group S,there were significant decreases of escape latency period,neuronal apoptosis,TLR4 mRNA,and APP and Aβ expression,but a increase of MMP in group ES (P＜0.05).Conclusion The attenuation of rat hippocampal neuronal apoptosis induced by EPO could be associated with inhibition of TLR4,improvement of MMP,as well as inhibition of APP and Aβ activity.

Objective To evaluate the role of mitochondrial ATP sensitive potassium ( mito-KATP ) channel in dexmedetomidine-induced inhibition of subarachnoid hemorrhage ( SAH )-caused programmed cell death ( PCD) in cardiomyocytes of rats. Methods On hundred and twenty clean-grade healthy male Sprague-Dawley rats, aged 9-10 weeks, weighing 350-400 g, were divided into 5 groups ( n=24 each) using a random number table method: sham operation group ( group Sham ) , SAH group, SAH plus dexmedetomidine group ( group SD) , 5-HD plus SAH and dexmedetomidine group ( group HSD) and 5-HD plus SAH group ( group HS) . The rats were subjected to SAH by intracranial vascular puncture after being anesthetized with pentobarbital sodium. Dexmedetomidine 5 μg∕kg was infused for 10 min via the jugular vein starting from the time point after intracranial vascular puncture, followed by a continuous infusion of 5μg·kg-1 ·h-1 for 1 h in SD and HSD groups. 5-HD 30 mg∕kg was intraperitoneally injected at 1 h before intracranial vascular puncture in HSD and HS groups. Blood samples were collected from the abdominal aor-ta at 24 h after intracranial vascular puncture for determination of serum cardiac troponin I ( cTnI) concen-trations. The animals were then sacrificed, and myocardial specimens were collected for determination of PCD rate ( by TUNEL) , reactive oxygen species ( ROS) activity ( by DCFH-DA assay) , and expression of cleaved caspase-3, cleaved caspase-1 and interleukin-1beta ( IL-1β) ( by Western blot) . Results Com-pared with group Sham, the serum concentrations of cTnI, PCD rate and ROS activity were significantly in-creased, and the expression of cleaved caspase-3, cleaved caspase-1 and IL-1βwas up-regulated in SAH, SD, HSD and HS groups ( P<0. 05) . Compared with group SAH, the serum concentrations of cTnI, PCD rate and ROS activity were significantly decreased, and the expression of cleaved caspase-3, cleaved caspase-1 and IL-1βwas down-regulated in group SD, and the serum concentrations of cTnI, PCD rate and ROS activity were significantly increased, and the expression of cleaved caspase-3, cleaved caspase-1 and IL-1βwas up-regulated in group HS ( P<0. 05) . Compared with group SD, the serum concentrations of cT-nI, PCD rate and ROS activity were significantly increased, and the expression of cleaved caspase-3, cleaved caspase-1 and IL-1β was up-regulated in group HSD ( P<0. 05) . Compared with group HSD, the serum concentrations of cTnI, PCD rate and ROS activity were significantly increased, and the expression of cleaved caspase-3, cleaved caspase-1 and IL-1βwas up-regulated in group HS ( P<0. 05) . Conclusion mito-KATP channel is involved in dexmedetomidine-induced inhibition of PCD in cardiomyocytes of rats with SAH.

Objective To evaluate the role of Toll-like receptor 4 (TLR4) signaling pathway in sevoflurane anesthesia-induced cognitive dysfunction in aged rats.Methods Twenty-seven SPF healthy male Sprague-Dawley rats,aged 20 months,weighing 550-750 g,were divided into 3 groups (n =9 each) using a random number table:control group (C group),sevoflurane anesthesia group (S group) and TLR4 antagonist plus sevoflurane anesthesia group (TS group).TLR4 monoclonal antibody 30 μl was injected into the lateral cerebral ventricle in group TS,and the equal volume of serum containing no antibody was injected into the lateral cerebral ventricle in C and S groups.At 10 min after completion of injection,S and TS groups inhaled the mixture of 4％ sevoflurane and 30％ oxygen for 6 h,and group C only inhaled the mixture of air and oxygen.Morris water maze test was performed at 24 h after the end of sevoflurane anesthesia.The animals were sacrificed after completion of Morris water maze test,brains were removed and hippocampi were isolated for determination of nerve cell apoptosis (using TUNEL) and expression of activated caspase-3 (using immunofluorescent staining).Nerve cell apoptosis rate was calculated.The expression of high-mobility group box 1 protein (HMGB1) mRNA in hippocampi was measured by Northern blot assay at 6 h after the end of sevoflurane anesthesia.The expression of amyloid precursor protein (APP) and amyloid beta protein (Aβ) in hippocampi was assessed by Western blot at 24 h after the end of sevoflurane anesthesia.Results Compared with C group,the escape latency was significantly prolonged,nerve cell apoptosis rate was increased,the expression of activated caspase-3,HMGB1 mRNA,APP and Aβ was up-regulated in group S,and nerve cell apoptosis rate was increased,the expression of activated caspase-3,HMGB1 mRNA,APP and Aβ was up-regulated (P＜0.05),and no significant change was found in the escape latency in group TS (P＞0.05).Compared with S group,the escape latency was significantly shortened,nerve cell apoptosis rate was decreased,and the expression of activated caspase-3,HMGB1 mRNA,APP and Aβ was down-regulated in group TS (P＜0.05).Conclusion Activation of TLR4 signaling pathway is involved in the mechanism of sevoflurane anesthesia-induced cognitive dysfunction in aged rats.

Objective: To evaluate the postoperative quality of life after surgery of patients with hepatic hemangioma. Methods: The retrospective and descriptive study was conducted. The clinical data of 104 patients who underwent surgery for hepatic hemangioma at Shengjing Hospital of China Medical University from September 2011 to February 2017 were collected. There were 28 males and 76 females, aged (49±8)years, with a range of 27-78 years. Enucleation of hepatic hemangioma or hepatectomy was selected according to tumor location of patients. Observation indicators: (1) surgical and postoperative situations; (2) assessment of quality of life in patients; (3) assessment of quality of life in patients comorbid with other chronic digestive diseases. Measurement data with normal distribution were represented as Mean±SD, and measurement data with skewed distribution were represented as M (range). Repeated data were analyzed using repeated ANOVA. Count data were represented as absolute numbers. Results: (1) Surgical and postoperative situations: of 104 patients, 67 underwent enucleation of hepatic hemangioma, 37 underwent hepatectomy. The tumor diameter, volume of intraoperative blood loss, duration of postoperative hospital stay were (10±4)cm, 200 mL (range, 10-3 000 mL), (11±5)days. Seven patients had complications, including 5 of massive abdominal ascites, 1 of abdominal infection, and 1 of pulmanory obstruction. There was no death occurred. (2) Assessment of quality of life in patients with hepatic hemangioma: the total scores of Gastrointestinal-related Quality of Life Index (GIQLI), the scores of subjective symptoms, physiological status, mental and psychological status, and social activities were 121.0±8.3, 69.2±4.1, 18.5±2.6, 19.5±1.8, and 13.8±1.4 at preoperation. The above indices were 121.9±6.9, 71.2±3.8, 17.2±2.5, 19.6±2.3, and 13.8±1.3 of 104 patients with hepatic hemangioma at one month after surgery, respectively. The above indices were 127.8±6.2, 73.2±3.6, 19.8±2.5, 20.8±2.4, and 14.1±1.0 at 6 months after surgery. There were significant differences in changing trends of above indices (F=68.4, 64.6, 71.4, 17.8, 3.3, P<0.05). The scores of subjective symptoms and physiological status at one month after surgery showed significant differences compared with those of preoperation (t=-5.780, 6.640, P<0.05), but the total scores of GIQLI, the scores of mental and psychological status, and social activities showed no difference (t=-1.569, -0.705, 0.240, P>0.05). The total scores of GIQLI, scores of subjective symptoms, physiological status, and mental and psychological status at 6 months after surgery showed significant differences compared with those of preoperation (t=-8.897, -9.919, -5.375, -5.024, P<0.05), but the score of social activities showed no difference(t=-1.919, P>0.05). The total scores of GIQLI, the scores of subjective symptoms, physiological status, mental and psychological status, and social activities at 6 months after surgery were significantly different from those at one month after surgery (t=-10.835, -6.787, -12.277, -4.560, -2.476, P<0.05). (3) Assessment of quality of life in hepatic hemangioma patients comorbid with other chronic digestive diseases: 29 of 104 patients were comorbid with chronic gastritis, biliary diseases, and appendicitis. For the 29 patients comorbid with other chronic digestive diseases, the total scores of GIQLI, the scores of subjective symptoms, physiological status, mental and psychological status, and social activities were 117.5±7.5, 67.8±4.2, 17.4±2.2, 19.0±1.5, and 13.2±1.3 at preoperation. The above indices were 118.7±6.9, 69.5±4.5, 16.7±2.0, 19.2±1.9, and 13.2±1.3 at one month after surgery, respectively. The above indices were 124.6±6.5, 70.9±4.5, 19.8±2.1, 19.9±2.4, and 14.0±0.9 of 29 patients comorbid with other chronic digestive diseases at 6 months after surgery. There were significant differences in changing of the total scores of GIQLI, the scores of subjective symptoms, physiological status, and social activities (F=15.0, 9.0, 27.6, 7.5, P<0.05), except the score of mental and psychological status (F=1.6, P>0.05) . The scores of subjective symptoms and physiological status at one month after surgery showed significant differences compared with those of preoperation (t=-2.612, 2.191, P<0.05), but the total scores of GIQLI, the scores of mental and psychological status, and social activities showed no difference (t=-1.128, -0.587, -0.157, P>0.05). The total scores of GIQLI, scores of subjective symptoms, physiological status, and social activities at 6 months after surgery showed significant differences compared with those of preoperation (t=-4.002, -3.441, -4.604, -3.266, P<0.05), but the score of mental and psychologica status showed no difference (t=-1.522, P>0.05). The total scores of GIQLI, the scores of subjective symptoms, physiological status, and social activities at 6 months after surgery were significantly different from those at one month after surgery (t=-4.819, -2.313, -7.081, -3.172, P<0.05), but the score of mental and psychological status had no significant difference (t=-1.154, P>0.05). Conclusions The quality of life in patients with hepatic hemangioma can be improved by surgery. Surgical treatment is still effective for improvement of the total scores of GIQLI, the scores of subjective symptoms, physiological status, and social activities for those combined with other digestive diseases.