Keratoacanthoma ( KA) is an epithelial neoplasm occurring in sun -exposed skin of the elder-ly.Two striking features of KA are its clinical behavior with spontaneous regression after rapid growth and its nos -ological position on the border between benignity and malignancy .The regression of KA may be associated with the hair follicle cycle,apoptosis and immune function of organism .This article summarizes physiological mecha-nisms such as Wnt/retinoic acid signalling cross -talk,the function of p53,bcl-2,bcl-xL and bak in apopto-sis,and the mechanism of action of several immune -related cells,that drives KA regression .It can provide theo-retical basis for us to select the method as well as time of the treatment in KA .

According to the characteristic of the practice in the outpatient dentofacial surgery,we analyzed the prominent contradiction in the process.With the progress of the medical service law and the innovation of the medical treatment mode,we must pay more attention to the ethics problems on the medical education.Before practice,we must strengthen the students' training in stimulator,the concept of legal,ethics,communication skill and so on.Teachers and hospitals should take the responsibility.The relevant laws and regulations ought to be modified step by step to ensure the practice.

AIM: To establish the quality standard for Hanshi Tougu Tablets(Radix Aconiti Praeparata,Radix Aconiti Kusnezoffii Praeparata,Ramulus Cinnamomi,Rhizoma Atractylodis, Semen Sinapis,Radix Aucklandiae,Radix Glycyrrhizae). METHODS: Rhizoma Atractylodis,Semen Sinapis,Radix Glycyrrhizae in Hanshi Tougu Tablet were identified by TLC.The content of cinnamaldehyde and costunolide in Hanshi Tougu Tablets were determinded by HPLC. RESULTS: Rhizoma Atractylodis,Semen Sinapis,Radix Glycyrrhizae,Radix Aconiti Praeparata and Radix Aconiti Kusnezoffii Praeparata could be identified by TLC.Cinnamaldehyde showed a good linear relationship at the range of 2.104 ?g?mL~(-1)-52.60 ?g?mL~(-1),r=0.999 8(n=5), and the recovery was(99.62%,) RSD was(0.88%).Costunolide also showed a good linear relationship at a range of(0.036) mg?mL~(-1)-0.54 mg?mL~(-1),r=(0.999 9)(n=5),and the recovery was 96.10%,RSD was 0.15%. CONCLUSION: The method is simple,accurate and with strong specificity and can be used for the quality control of Hanshi Tougu Tablets.

Objective To explore the diagnosis value of X-ray breast imaging reporting and data system (BI-RADS) combined with wire-guided localization biopsy for breast microcalcifications in impalpable breast cancer.Methods 192 palpation negative patients with 205 microcalcification lesions were detected by mammography.All lesions were classified according to BI-RADS descriptors for calcification and were categorized by the BI-RADS.The patients with BI-RADS category 4a and above underwent X-ray positioning guide wire-guided biopsy and pathological diagnosis.Results In 205 microcalcification lesions,74 (36.1％) were malignant lesions,131 (63.9 ％) were less than benign lesions.The positive predictive value of malignant breast lesions in clustered,segmental,regional linear branching calcifications were higher [83.3 ％ (5/6),100.0 ％ (11/11),100.0 ％ (1/1)],followed by clustered,linear,segmental,regional pleomorphic calcifications [55.9 ％ (38/68),50.0 ％ (1/2),40.0 ％ (8/20) and 33.3 ％ (4/12),respectively].The positive predictive values of malignant in linear branching calcifications and pleomorphic calcifications were significantly higher than those of coarse heterogeneous calcifications,amorphous or indistinct calcifications (x2 values were 34.44,51.87,16.71,29.86,all P ＜ 0.05).The linear branching calcification had the highest possibility.The proportions of malignant lesions in four different types of glands were extremely dense 40.5 ％ (30/74),heterogeneously dense 39.2 ％ (29/74),scattered areas of fibroglandular density 10.8 ％ (8/74) and fat 9.5 ％ (7/74),respectively.Conclusions BI-RADS categorization for breast microcalcification lesions can improve the detection rate of impalpable breast cancer.Linear branching calcification has higher predictive value for malignant lesions.Dense breast is the risk factors of breast cancer,which should be attached great importance.

Chloroplast-based expression system is promising for the hyper-expression of plant-derived recombinant therapeutic proteins and vaccines. To verify the feasibility of obtaining high-level expression of the SARS subunit vaccine and to provide a suitable plant-derived vaccine production platform against the severe acute respiratory syndrome coronavirus (SARS-CoV), a 193-amino acid fragment of SARS CoV spike protein receptor-binding domain (RBD), fused with the peptide vector cholera toxin B subunit (CTB), was expressed in tobacco chloroplasts. Codon-optimized CTB-RBD sequence was integrated into the chloroplast genome and homoplasmy was obtained, as confirmed by PCR and Southern blot analysis. Western blot showed expression of the recombinant fusion protein mostly in soluble monomeric form. Quantification of the recombinant fusion protein CTB-RBD was conducted by ELISA analysis from the transplastomic leaves at different developmental stages, attachment positions and time points in a day and the different expression levels of the CTB-RBD were observed with the highest expression of 10.2% total soluble protein obtained from mature transplastomic leaves. Taken together, our results demonstrate the feasibility of highly expressing SARS subunit vaccine RBD, indicating its potential in subsequent development of a plant-derived recombinant subunit vaccine and reagents production for antibody detection in SARS serological tests.
Chloroplasts ; metabolism ; Cholera Toxin ; Protein Interaction Domains and Motifs ; Recombinant Fusion Proteins ; biosynthesis ; SARS Virus ; Spike Glycoprotein, Coronavirus ; biosynthesis ; Tobacco ; metabolism ; Vaccines, Subunit ; biosynthesis

Objective To measure the learning passion of medical students and evaluating its in-fluencing factors. Methods Taking 879 medical students as research subjects to conduct a questionnaire survey according to specialty and grade stratified sampling. The questionnaire contained two parts, includ-ing learning passion scale and general situation questionnaire. The effective recovery rate was 69.28%, 609 valid questionnaires were recovered. SPSS 22.0 and AMOS 21.0 software were used for statistical analysis of data, analyzing the reliability and validity of the questionnaire with internal consistency reliability coeffi-cient and confirmatory factor analysis. The factors of learning passion of medical students were analyzed by logistic regression analysis. Results The questionnaire of learning passion of medical students contained 12 measurement items, including 2 dimensions: harmonious passion and obsessive passion. The questionnaire was of fine reliability (Cronbach's Alpha=0.916) and validity (χ2/df=3.401,RMSEA=0.073,GFI=0.958). The
learning passion of medical students was at upper middle level (4.390±0.934). The influence of achievement level (OR=1.691, 95%CI=1.415 to 2.021), school satisfaction (OR=0.586, 95%CI=0.402 to 0.854) and profession plan (short-term plan OR=2.121, 95%CI=1.310 to 3.434;long-term plan OR=3.822,95%CI=1.972 to 7.405) on learning passion were statistically significant. Conclusion The questionnaire of learning pas-sion of medical students has fine reliability and validity. Achievement level, school satisfaction and profes-sion plan are factors affecting the learning passion of medical students.

Objective To determine the effect of fibroblast growth factor (FGF) on endothelia cell (EC) proliferation in vitro,TNP-470 and dexamethasone (Dex) and explore the possible mechanisms of FGF stimulating EC proliferation. Methods Cultured human umbilical vein endothelial cell (HUVEC) was divided into two groups: control group (Group DMEM) and experimental groups (Group FGF,Group Dex,Group TNP-470,Group FGF+Dex,Group FGF+TNP-470). The EC proliferation was quantified by a colorimetric assay using MTT reagent,the relative cell numbers at every time point of EC cycle analyzed with flow cytometer,and the expression of nuclear factor-kappa B p65 (NF-?B p65) and ki-67 detected with immunohistochemical method of SABC. Results FGF stimulated significantly EC proliferation,raised proliferation index (PI) and enhanced the expressions of NF-?B p65 and ki-67 in nuclear. TNP-470 reduced PI and TNP-470 and Dex suppressed EC proliferation and finally decreased the expressions of NF-?B p65 and ki-67 in nuclear. FGF could facilitate the inhibitory effect of TNP-470 and Dex. Conclusions The possible mechanism of EC proliferation stimulated by FGF is that FGF can activate NF-?B to promote the synthesis of DNA and EC mitosis. TNP-470 and Dex suppress proliferation and differentiation of EC but FGF may reverse such suppressive effect.

Objective:To observe the influence of radiofrequency catheter ablation of the fat pad at the right pulmonary vein- atria junction(RPV fat pad)on Bezold-Jarisch reflex(BJR)induced by veratridine in canine.Methods:Ten mongrel dogs were anesthetized and their chest were opened through a right thoracotomy to expose the RPV fat pad.Veratridine was injected into the left ventricle at bolus doses of 10?g/kg through a catheter to induce BJR.The sinus cycle length(SCL),systolic arterial pressure(SAP),diastolic arterial pressure(DAP),mean arterial pressure(MAP),left ventricle systolic pressure(LVSP), left ventricle diastolic pressure(LVDP)and mean left ventricle pressure(MLVP)were measured under the baseline and after ablation of the RPV fat pad;the changes of the above parameters(?SCL,?SAP,?DAP,?MAP,?LVSP,?LVDP,and?MLVP)were calculated.Then the same dose of veratridine was injected under the pad after ablation and the changes of the a- bove parameters were observed.Results:BJR was successfully induced in the 8 animals;the animals has prolonged sinus cycle length(SCL)and decreased MAP and MLVP.After ablation,the prolongation of SCL after injection of veratridine was markedly reduced([229.2?92.3]ms vs[39.3?14.1]ms,P

Microwaves can be directly transformed into heat inside materials because of their ability of penetrating into any substance. The degree that materials are heated depends on their dielectric properties. Materials with high dielectric loss are more easily to reach a resonant state by microwaves field, then microwaves can be absorbed efficiently. Microwave irradiation technique with the unique heating mechanisms could induce drug-polymer interaction and change the properties of dissolution. Many benefits such as improving product quality, increasing energy efficiency and reducing times can be obtained by microwaves. This paper summarized characteristics of the microwave irradiation technique, new preparation techniques and formulation process in pharmaceutical industry by microwave irradiation technology. The microwave technology provides a new clue for heating and drying in the field of pharmaceutics.
Chemistry, Pharmaceutical ; methods ; Drug Discovery ; instrumentation ; methods ; Microwaves ; Pharmaceutical Preparations ; administration & dosage ; chemistry ; Technology, Pharmaceutical ; methods

Adult ; Bone Marrow Transplantation ; Fractures, Ununited ; therapy ; Humans ; Male ; Transplantation, Autologous