Objective To establish the model of traumatic brain injury in rats with controlled cortical impact (CCI), and investigate the features of coma and cognition. Methods 40 male Sprague-Dawley rats were randomly divided into control group (n=10), sham group (n= 10) and CCI group (n=20). CCI group was impacted at bilateral frontal lobe with the velocity of 3.5 m/s, depth of 7 mm and dwell time of 250 ms. The time of consciousness loss was recorded, and all the rats were investigated with Morris Water Maze 10 and 20 days after operation. Results The time of consciousness loss was longer in the CCI group than in the control group and the sham group (P<0.001). The escape latency was longer in the CCI group than in the control group and the sham group (P<0.001), while the percent of time spend in goal quarter during probe trial was less (P<0.001), both 10 days and 20 days after operation. Conclusion CCI at bilateral frontal lobe of rats can establish the model of severe traumatic brain injury with coma and long-term cognitive dysfunction.

Objective To evaluate the value of dual-phase spiral CT scanning in diagnosis of small pancreatic carcinoma.Methods 21 cases with small pancreatic carcinoma (≤2 cm) underwent plain CT scan and dual-phase eahanced spiral CT including arterial phase(20~25 s after infusion)and pancreatic phase(50~60 s after infusion)with a 100 ml bolus injection of contrast material at 3~6 ml/s.CTattenuation values of tumor and normal pancreas in all scanning phase were obtained.Results The mean CT value of tumor was(42?14) HU(arterial phase)and (48?18) HU(pancreatic phase),the mean CT value of normal pancreas was (105?15) HU(arterial phase)and (86?11) HU(pancreatic phase).The dens difference of tumor-pancreas was significantly on arterial phase (69?15) HU.Conclusion The maximum dens difference of tumor-pancreas can be obtained on arterial phase CT scan,it has advantages in diagnosing pancreatic carcinoma of early period and to judge the resectionability of pancreatic carcinoma.

Objective To evaluate the method of controlled cortical impact(CCI) on long term cognitive disorder after traumatic brain injury(TBI) and to investigate the possible pathological mechanism.Methods Sixty male SD rats were randomly assigned into 3 groups:sham surgery group(n =10),control group (n =10) and CCI group(n =40).CCI application was used to make the bilateral frontal lobe controlled cortical impact model (depth:1.5 mm,velocity =3.5 m/s,dwell time =400 ms).Morris water maze test and Nissl's staining was used to assess the cognitive function and pathological changes after 8 weeks of CCI.The expressions of brain derived neurotrophic factor (BDNF) and tyrosine protein kinase B (TrkB) mRNA in frontal lobe and hippocampus tissue was detected by reverse transcription polymerase chain reaction(RT-PCR).Results The mortality in CCI group was only 12.5％.Morris water maze test results showed the escape latency in CCI group was longer than that in sham surgery and control groups(F =51.784,P ＜ 0.05).Percent of time spend in goal quarter during probe trial in CCI group was significantly less than that in sham surgery and control groups(F =13.468,P ＜ 0.05).Nissl's staining showed frontal lobe had obviously defects; Nissl's bodies of frontal cortex and CA1 region in hippocampus reduced.The expressions of BDNF and TrkB mRNA in frontal lobe and hippocampus were significantly less than those in sham surgery and control groups(P ＜ 0.05).Conclusions The CCI model can be applied for study on long term cognitive disorder after TBI with good stability and repeatability.Using the experimental parameters of CCI can damage the long term cognitive function after TBI in rats,and lead the pathology changes of brain tissue clearly.This may have some relationship with the expressions of BDNF and TrkB mRNA.

ObjectiveTo investigate the effect and gender differences of experimental moderate pain on attentional bias towards pain-related words.MethodsWith the tourniquet around the left upper limb,32 healthy college students were asked to perform two dot-probe tasks including five kinds of pain-related words,one task with the tourniquet deflating and the other task with the tourniquet inflating to 200 mm Hg pressure.The reaction time (RT) and the error rate of recognition task were recorded.The pain intensity and distress were recorded too.Results ( 1 ) Compared with no pain condition ( RT of affective and social-threat words were (507 ± 78 ) ms,(504 ±89 )ms respectively),the react time was shorter in female in the condition of tourniquet pain,particularly for affective and social-threat words (the RT were (464 ± 79 )ms,(465 ± 72 )ms respectively,F ( 1,4) =19.157,P ＜0.01 ),but not in male.( 2 ) In condition of no pain,the reaction time of male ( (456 ± 59) ms ) was shorter than that of female (504 ± 79ms).However,in the condition of pain,the significant main effect was not found.ConclusionThe reacting time of female was shorter in condition of moderate tourniquet pain,which imply that female showed significant attentional bias towards affective and social-threat words.

Objective To analyze the clinical features and imaging findings of lesser trochanter osteoidosteoma,and to discuss the causes of its misdiagnosis as chronic osteomyelitis.Methods The clinical features,X-ray,CT and MRI findings of 6 cases with pathologically confirmed osteoidosteoma in the lesser trochanter were reviewed retrospectively.Symptoms included knee pain (1 case),thigh pain (4 cases)and hip joint pain(1 case);claudication(2 cases),and night pain(1 case).Five patients had right-side,and 1 patient had left-side involvement.All the 6 cases were misdiagnosed as chronic osteomyelitis before operation.Results Four patients had CT scan,which showed intra-cortical niduses at the lesser trochanters with peri-focal sclerosis,joint capsule swelling and joint effusion. Five patients had MRI exams,MR images showed bone marrow edema,synovial thickening,joint capsule swelling and joint effusion in all the 5 cases,but only 2 showed niduses.Six patients had X-ray imaging exams,X-ray images showed bone sclerosis without radiolucent nidus.Conclusion Osteoidosteoma in the lesser trochanter may display atypical clinical features that might be difficult to be differentiated from chronic osteomyelitis without sufficient examination.CT is best in showing niduses,except some niduses with atypical shape,superficial location and high-density calcification.MRI-T2WI is sensitive in showing the inflammation and bone marrow edema with high signal intensity,which may affect nidus displaying.X-ray images can only display bone sclerosis without niduses.

Objective To explore the clinical features and risk factors of post-concussion syndrome (PCS) in patients after mild traumatic brain injury (mTBI).Methods Two hundred and seventy-six patients with mTBI,admitted to our hospital from December 2016 to June 2018,were chosen in our study;114 patients (41.30％) developed PCS.The epidemiological data,causes and sites of brain injury,clinical symptoms,and duration and time of PCS occurrence were investigated.Multivariate Logistic regression was used to analyze the risk factors of PCS in patients with mTBI.Results The most common syndromes of PCS were headache (89.13％),amnesia (63.77％),dizziness (63.04％) and nausea (57.61％).The incidence rate of PCS was 51.75％ in the first month of injury and decreased with time.Multifactor Logistic regression analysis showed that student (P=0.041,OR=0.36,95％ CI:0.14-0.95),electric bicycle accidents (P=0.043,OR=0.54,95％CI:0.30-0.98),and occipital injury (P=0.022,OR=0.28,95％CI:0.09-0.83) were independent risk factors of PCS of mTBI patients.Conclusion Patients with mTBI,especially those who are students,victims of electric bicycle accidents and victims of occipital injury,should be highly alert to the occurrence of PCS,and need reasonable rest,symptomatic treatments and memory training or other rehabilitation treatments within one month of injury,in order to prevent the development of PCS.

Pathology is the gold standard for diagnosis of neoplastic diseases.Whole slide imaging turns traditional slides into digital images,and artificial intelligence has shown great potential in pathological image analysis,especially deep learning models.The application of artificial intelligence in whole slide imaging of lung cancer involves many aspects such as histopathological classification,tumor microenvironment analysis,efficacy and survival prediction,etc.,which is expected to assist clinical decision-making of accurate treatment.Limitations in this field include the lack of precisely annotated data and slide quality varying among institutions.Here we summarized recent research in lung cancer pathology image analysis leveraging artificial intelligence and proposed several future directions.

Objective: To explore the activation of endoplasmic reticulum stress (ERS) in bone marrow mesenchymal stem cell (BMMSC) and its effect on osteogenic differentiation induced by micropit/nanotube topography (MNT), so as to provide guidance for the topography design of biomaterials. Methods: Four sample groups were fabricated: polishing control group (polished titanium, PT, no treatment), thapsigargin treatment (TG, 0.1 μmol/L TG treated for 9 h), MNT5 and MNT20 (anodized at 5 V and 20 V after acid etching). Scanning electron microscope (SEM) was used to observe the topography of Ti samples. The alkaline phosphatase (ALP) production, collagen secretion and extracellular matrix (ECM) mineralization of BMMSC (osteogenic induced for 7, 14 and 21 d) on Ti samples were detected to evaluate the osteogenic differentiation. After 12 h incubation, the shape and size of ER was examined using a transmission electron microscope (TEM), and ERS-related genes including immunoglobulin heavy chain binding protein (BiP), protein kinase RNA-like endoplasmic reticulum kinase (PERK) and activating transcription factor 4 (ATF4) were detected by quantitative real-time PCR (qRT-PCR). Results: After 7, 14 and 21 d of induction, the ALP production, collagen secretion and ECM mineralization in TG and MNT20 all significantly increased compared to PT (P<0.05). The cells grown on TG, MNT5 and MNT20 surfaces displayed gross distortions of the ER. Compared to PT, BiP, PERK, ATF4 mRNA expression in TG was respectively 1.87±0.10, 2.24±0.35, 1.85±0.14; BiP, ATF4 mRNA expression in MNT5 were respectively 1.27±0.09, 1.25±0.04; BiP, PERK, ATF4 mRNA expression in MNT20 were respectively 1.44±0.09, 2.40±0.60, 1.48±0.05 (P<0.05). Conclusions MNT triggered different degree of ERS, and the activated ERS may promote MNT-induced osteogenic differentiation.

In order to overcome the challenges of insufficient restriction enzyme sites, and construct a fusion-expression vector with flexible fusion direction, we designed an LB cloning system based on the type IIS and type IIT restriction enzymes LguⅠ and BbvCⅠ. The LB cloning system is constructed by inserting the LB fragment (GCTCTTCCTCAGC) into the multiple cloning site region of the broad-host plasmid pBBR1MCS-3 using PCR. The LB fragment contains partially overlapped recognition sites of LguⅠ and BbvCⅠ. Therefore, the same non-palindromic sequence will be generated by these two restriction endonucleases digestion. This feature can be used to quickly and flexibly insert multiple genes into the expression vector in a stepwise and directed way. In order to verify the efficacy of the cloning system, two glycosyltransferase genes welB and welK of Sphingomonas sp. WG were consecutively fused to the LB cloning vector, and the recombinant plasmid was transferred into Sphingomonas sp. WG by triparental mating. The results showed that gene fusion expression has little effect on sphingan titer, but enhanced the viscosity of sphingan. The viscosity of the sphingan produced by recombinant strain Sphingomonas sp. WG/pBBR1MCS-3-LB-welKB was 24.7% higher than that of the wild strain after fermentation for 84 h, which would be beneficial for its application. In conclusion, the application of LB cloning system were verified using Sphingomonas sp. WG. The LB cloning system may provide an efficient tool for fusion expression of target genes.
Base Sequence ; Cloning, Molecular ; Fermentation ; Plasmids/genetics* ; Sphingomonas/metabolism*

OBJECTIVE: To explore the feasibility of using indocyanine green angiography in mapping the superficial temporal vessels and assisting design and harvesting of the superficial temporal artery based forehead flap. METHODS: A clinical data of 14 patients with facial soft tissue defects repaired with superficial temporal artery based forehead flaps between October 2015 and November 2022 was retrospectively analyzed. There were 9 males and 5 females with a median age of 9.5 years (range, 3-38 years). The forehead flaps were used to reconstruct facial soft tissue defects following excision of facial scar (8 cases) or congenital melanocyte nevus (6 cases). The size of defects ranged from 3 cm×2 cm to 24 cm×9 cm. Before operation, the indocyanine green angiography was used to map the superficial temporal artery and vein, and to analyze the relationship of the arteries and veins. The forehead flaps with unilateral superficial temporal fascia as the pedicle was transferred to repair the small facial defect in 2 cases. The facial pedicle contained the frontal branch of the superficial temporal artery and 2 cm of the superficial temporal fascia around the vessel, and the tiny accompanying vein of the frontal branch of the superficial temporal artery was used as the outflow of the flap. The forehead flaps with the skin pedicle including bilateral or unilateral superficial temporal fascia and the overlying skin was pre-expanded and transferred to repair the large facial defect in 12 cases. The skin pedicle contained the frontal branch of superficial temporal artery and one of main branches of superficial temporal vein. Among the 12 cases, the frontal branch of superficial temporal vein was used as the outflow in 4 cases, and the parietal branch was used as the outflow in 8 cases. The size of the flaps ranged from 3 cm×2 cm to 30 cm×13 cm. The skin pedicles were divided at 3 weeks after the flap transfer. RESULTS: Indocyanine green angiography could clearly showed the course and branching of the superficial temporal artery and vein. Individual differences existed in the location where the frontal branch of the superficial temporal artery entered the forehead. The superficial temporal vein had great variability and did not follow the artery. One patient had expander-related complication, which resulted in 3-cm flap necrosis. The necrotic tissue was debrided and repaired with skin grafting. The other flaps totally survived and the incisions healed by first intention. All patients were followed up 2-24 months, with a median of 11.5 months. The color, texture, and thickness of the flaps matched well with those of recipient sites. Hypertrophic scar was not observed in recipient or donor site. All patients were satisfied with the reconstructive outcomes. CONCLUSION Indocyanine green angiography can clearly visualize the course and the branches of the superficial temporal arteries and veins, which can help surgeons understand the position, distribution, and concomitant relationship of the superficial temporal vessels, and make a rational surgical plan of the forehead flap.
Male ; Female ; Humans ; Child, Preschool ; Child ; Adolescent ; Young Adult ; Adult ; Temporal Arteries/surgery* ; Indocyanine Green ; Forehead/surgery* ; Retrospective Studies ; Skin Transplantation ; Angiography ; Soft Tissue Injuries/surgery* ; Perforator Flap/blood supply* ; Treatment Outcome