Objective To investigate the inhibitory effect of cryptotanshinone on different maturation stages of Staphylococcus epidermidis (S.epidermidis) biofilm.Methods The biofilm model of S.epidermidis was constructed in vitro, the timing of adhesion, accumulating, and maturation was determined;matrix quantity, bacterial metabolism, microstructure of biofilm were detected with semi-quantitative adhesion test, XTT assay, and scanning electron microscope(SEM) respectively.Results The timing of adhesion, accumulating, and maturation of S.epidermidis biofilm were 6h, 24h,and 48h respectively;in adhesion period, cryptotanshinone at the concentration of 128μg/mL and 32μg/mL could both obviously reduce the matrix and kill bacteria inside biofilm, difference was statistically significant(P<0.05),inhibitory effect of 128μg/mL cryptotanshinone was better than 32μg/mL (P<0.05), the microstructure was destroyed by both concentrations.During accumulating and mature period, only cryptotanshinone at 128μg/mL could reduce the matrix of biofilm and kill bacteria inside biofilm (P<0.05), the microstructure was damaged by cryptotanshinone at concentration of 128μg/mL, while 32g/mL of cryptotanshinone had no obvious inhibitory effect(P>0.05).Conclusion Cryptotanshinone has a certain inhibitory effect on different stages of S.epidermidis biofilm, and there is a certain dose effect.

Objective To understand the distribution and drug resistance of pathogens causing catheter related bloodstream in‐fection (CRBSI) to provide reference for clinical treatment .Methods The distribution and drug resistance of pathogens isolated from the central venous catheter from January 2011 to June 2015 were retrospectively analyzed .Results Among 731 submitted samples ,38 cases were CRBSI ,with the positive rate of 5 .3% ,in which ,the Gram‐positive cocci accouted for 26 .3% of isolated bacteria and dominated by Staphylococcus epidermidis (13 .2% ) ,moreover which was MRSE .MRSA and VRE were not detected . Gram‐negative bacilli accounted for 73 .7% of isolated bacteria and dominated by Acinetobacter baumannii (42 .1% ) ,which was most sensitive to amikacin with the sensitivity rate of 87 .5% .Conclusion Acinetobacter baumannii is most common pathogen in CRBSI with serious drug resistance ,therefore the operating should be standardized in clinical work for controlling infection .

NS2 and NS3 are two post-transcriptional gene silencing suppressors that are encoded by Rice stripe virus. Gene silencing suppressors are always related to the pathogenicity of viruses. In this study, the cDNA of NS2 and NS3 were recombined by overlapping PCR assays, ligated to the RNAi vector, and inserted into the PXQ expression vector using Pst I; the expressed vector was transferred into calluses induced from seeds of the japonica rice cultivar, 'Nipponbare', using an Agrobacterium-mediated method. Thirty-one T0 transgenic plants were selected by G418 screening. PCR and southern blot analyses confirmed that the target gene was transformed into transgenic rice successfully, and different transgenic plants contained various copies of the gene. The disease resistance assay revealed that T0 transgenic rice had a delayed onset of RSV for approximately 10-20 d, and the accumulation of virus in the transgenic plants was reduced by 30%-50%. This was related to the delayed onset of disease.
Disease Resistance ; Oryza ; genetics ; immunology ; virology ; Plant Diseases ; genetics ; immunology ; virology ; Plants, Genetically Modified ; genetics ; immunology ; virology ; RNA Interference ; Tenuivirus ; genetics ; immunology ; Viral Nonstructural Proteins ; genetics ; immunology

Background The application of femtosecond laser in the corneal refractive surgery has made great progression recent years,but the morphology characteristic of corneal stroma surface after making-flap of femtosecond laser is closely concerned.Objective This study was to analyze the influence of photodisrnption of femtosecond laser on the corneal stroma surface and to investigate the effect of different laser pulse energy on the sudace ultrastructure of corneal stroma.Methods Corneal flaps were made with Visu Max femtosecond laser in 16 fresh porcine eyes with the pulse energy 125 nJ,155 nJ and 195 nJ respectively,and Moria-M2 microkeratome was used as control.Scanning electron microscopy (S-3400N Hitachi High-Technologies Corp) was used to observe and compare the ultrastructural characteristic of corneal stroma bed surface after making of corneal flap.Results The corneal strnma was evaporated and created a smooth surface when photodisrnption happened in the femtosecond laser group.Residual tissue bridges could been exhibited among the cavitation bubbles under the scanning electron microscope.Corneal strnma surface was smooth in the 125 nJ pulse energy group,but some tissue bridges still were visible.In the 155 nJ pulse energy group,much more smooth surface was seen without tissue bridges and mechanical damages on the corneal surface.However,the surface quality was worse and many tissue bridges and grooves existed in the 195 nJ pulse energy group.In addition,different sizes of slots caused by big cavitation bubbles were visible with the round and oval shape.The edges were regular and sharp with small damage zone after cutting with femtoseeond laser.However,many elevated fibril tissues could be seen on the corneal surface after making of flap with microkeratome.Many crimp and irregularity tissues were found on the surface.Blunt surface and indentations appeared in the cutting edge.Conclusions The mierostrueture of corneal stroma surface is more smoother after making of corneal flap with fentosecond laser in comparison with microkeratome.Pulse energy of 155 nJ is preferably during the making-flap with femtosecond laser.

A series of experiments were conducted to study the mutation of Kloechera apiculata by many kinds of treatments such as UV and UV+LiCl.The optimal dosage disposal was determined:15 W 30 cm under Ultraviolet irradiation for 20 s,UV+LiCl under Ultraviolet irradiation for 20 s and added LiCl 0.3% (w/v).One strain(UV20-13)which had obvious physiological characteristic was obtained.the incidence of blue and green mold of citrus was reduced by 25.56%and 10.00%in vivo experiment after 7 days respectively. The strain UV20-13 was tested by the experiments of subculture and dynamic growth,and the results showed that the strain UV20-13 was better than K.apiculata in the growth characteristics,and it did not appear retrogression,reversion mutation ect after subculturing 10 generations.Therefore the strain UV20-13 had genetic stability.

Objective To discuss the effect of the calcaneocuboid joint arthrodesis on the weight- bearing area of subtalar joint and its clinical significance.Methods Twelve fresh-frozen cadaver foot specimens were used for determination of weight-bearing area of the subtalar joint on foot and ankle neutral position,dorsiflexion,plantoflexion,adduction,abduction,inversion and eversion motion by means of pressure sensitive film before and after calcaneocuboid joint arthrodesis under weight loading.Results Weight-bearing area of the subtalar joint averagely increased for (32.54?7.45)% in all positions after calcaneocuboid joint arthrodesis,with statistical significance (P＜0.05).Conclusion Weight-bear- ing area of the subtalar joint increases after calcaneocuboid joint arthrodesis,which contributes to decrea- sing the pressure and increasing the stability of the subtalar joint.

OBJECTIVETo explore the technique and therapeutic effect of bridge wire splint fixation with ankle dorsiflexion for the treatment of femoral shaft fractures in young children. Methods:From June 2006 to June 2012,45 young children with femoral shaft fractures were treated by bridge wire splint fixation with ankle dorsiflexion,which was designed according to arch bridge mechanical principle and structure. There were 31 males and 14 females with an average age of 3.2 years old ranging from 8 months to 5.5 years old; 14 cases were upper 1/3 femoral fractures,26 cases were middle 1/3 femoral fractures,5 cases were lower 1/3 femoral fractures; 20 cases were transverse fractures, 14 cases were oblique fractures,6 cases were spiral frac- tures, and 5 cases were comminuted fractures. X-ray, follow-up imaging changes,clinical curative effect and complications were assessed.

RESULTSForty-five patients were followed up for 6 to 21 months (averaged 12 months). All fractures were reached clinical bone healing after 5 to 7 weeks (averaged 6 weeks) fixation. Seven cases appearred limb soft tissue complications, including buttocks bedsore,dorsal foot and Achilles tendon epidermal necrosis, and healed after dressing and removal of external fixation. During follow-up,the original overlap angle and lateral displacement were remodeled, and limbs were restored to the normal line of force and bone structure. According to Flynn standard, 35 cases got excellent results, 8 cases good, 2 cases fair.

CONCLUSIONThe bridge wire splint fixation with ankle dorsiflexion for the treatment of femoral. shaft fractures in young children (less than 6 years old) is safe,feasible, simple,and has raliable effect, which can be applied in primary hospitals.

Ankle ; surgery ; Bone Wires ; Child ; Child, Preschool ; Female ; Femoral Fractures ; surgery ; Femur ; surgery ; Follow-Up Studies ; Fracture Fixation, Intramedullary ; instrumentation ; Humans ; Infant ; Male ; Treatment Outcome

Objective To study the effects of different level of iodine nutrition on the thyroid function in women of reproductive age. Methods A total of 100 (50 from each) women of reproductive age but not pregnant were collected from iodine deficient and adequate areas. The questionnaire was obtained individually with items concerning personal history of thyroid diseases, goiters and category of edible salt and drinking water based on the project design. The household salt and drinking water were collected for measuring iodine content, and blood samples were obtained for TSH, FT4 and FT3 testing. Results The coverage of iodized salt and the median level of urinary iodine in iodine deficient women(72.0% and 95.5 μg/L) were obviously lower than that in iodine sufficient women(100.0% and 167.4 μg/L, χ2=16.28, U = 632.00, P < 0.01). Median level of serum TSH in iodine deficient women (2.56 m U/L) appeared in an increasing tendency compared to the iodine sufficient women (1.88 mU/L), but there was no significance (U=990.50, P > 0.05). Serum FT4 mean level in iodine deficient women [(14.7±2.0) pmol/L]was lower than that in iodine sufficient women[(17.0±3.8)pmoI/L, t=3.76, P<0.01]. There was no difference in serum FT3 between two group women[(5.1±1.4), (4.8±0.5)pmoI/L, t = 1.59, P > 0.05]; but FT3/FT4 ratio in iodine deficient women(0.33±0.04) was markedly higher than that in the iodine sufficient women(0.30±0.04, t=3.13, P<0.01). The percentage of thyroid dysfunction in iodine deficient women[20.0% (10/50)]was higher compared with the iodine sufficient women[8.0%(4/50)], but without significance(χ2=2.99, P>0.05). Conclusions Iodine deficiency is a primary cause leading to hypothyroid in women of reproductive age. Long term of iodized salt usage is an efficient way to correct iodine deficiency.

The effects of streptozotocin-induced diabetes or long-term glyburide administration on mRNA levels of components of ATP-sensitive potassium channel(SUR1,SUR2,Kir6.2)in rat brain were observed. Streptozotocin-induced diabetes itself did not affect the mRNA levels of SUR1,SUR2,and Kir6.2 in the brain, and glyburide-treatment increased the Kir6.2 mRNA level in brain by 23% in non-diabetic rats than those in normal control but did not change SUR1 and SUR2 levels.The effects of glyburide on SUR1,SUR2 and Kit6.2 mRNA levels did not manifest in brain of diabetic rats.

OBJECTIVETo study the clinical and molecular characteristics of methicillin-resistant Staphylococcus aureus (MRSA) infection in children.

METHODA total of 37 MRSA strains were isolated from hospitalized patients in Children's Hospital of Fudan University from March 2009 to November 2011. The clinical characteristics were investigated by a cohort study. Furthermore, the mecA, Panton-Valentine leucocidin (PVL) genes were detected by polymerase chain reaction (PCR), and the genotypes of SCCmec were determined by multiplex PCR.

RESULT(1) Among the 37 MRSA isolates, infections with 21 were acquired from hospital (HA-MRSA), and 16 isolates were acquired from community (CA-MRSA). (2) In the study, MRSA frequently caused respiratory tract infection, and most of the strains were isolated from intensive care unit (ICU). (3) CA-MRSA was most frequently associated with skin and soft tissue infections (SSTI), suppurative tonsillitis, even pneumonia and septicemia. HA-MRSA infection was more aggressive, most frequently associated with pneumonia, septicemia, and central nervous system (CNS) infections, such as meningitis. In children with fever caused by HA-MRSA or CA-MRSA infection, HA-MRSA showed a longer duration of fever, for 10.5 days. C-reactive protein (CRP) level caused by HA-MRSA (63.00 mg/L) was higher than CA-MRSA (9.50 mg/L) , and there were statistically significant differences between the groups (t = 2.5670, P < 0.05). However, there were no statistically significant differences between the groups in white blood cell count (WBC) or procalcitonin (PCT) level. (4) Among 37 MRSA isolates, the whole isolates were mecA gene positive (100%). SCCmec genotyping results showed that the most frequent SCCmec types were type III, 17 isolates, the others including type IV 8 isolates, type II1 isolates, nontypable 11 isolates, type I and type V were not found in this group. Therein, among 21 HA-MRSA isolates, SCCmec III was the most common, 15 isolates, type IV 1 isolates, nontypable 5 isolates; among 16 CA-MRSA isolates, SCCmec type IV was the most common, 7 isolates, type III 2 isolates, type II 1 isolate, nontypable 6 isolates. (5) Among the 37 MRSA isolates, 28 were PVL gene positive; and among 21 HA-MRSA isolates, 17 were PVL gene positive; Among 16 CA-MRSA isolates, 11 were PVL gene positive; There were no statistically significant differences between the groups (χ(2) = 0.735, P > 0.05) .

CONCLUSIONCompared with CA-MRSA, HA-MRSA infection was more aggressive, and induced higher C reactive protein; the dominant epidemic strains of CA-MRSA was SCCmec type IV, and HA-MRSA was SCCmec type III; the positive rate of PVL gene was high.

Adolescent ; Anti-Bacterial Agents ; pharmacology ; Bacterial Proteins ; genetics ; Bacterial Toxins ; genetics ; Bacterial Typing Techniques ; Child ; Child, Preschool ; China ; epidemiology ; Cohort Studies ; Community-Acquired Infections ; epidemiology ; microbiology ; Cross Infection ; epidemiology ; microbiology ; DNA, Bacterial ; genetics ; Female ; Genotype ; Humans ; Infant ; Infant, Newborn ; Male ; Methicillin ; pharmacology ; Methicillin Resistance ; genetics ; Methicillin-Resistant Staphylococcus aureus ; classification ; genetics ; isolation & purification ; Penicillin-Binding Proteins ; Staphylococcal Infections ; epidemiology ; microbiology