OBJECTIVE:To prepare gelatin drug carrier with biocompatible sugars as crosslinking agents and study its drug release characteristics.METHODS:Gelatin discs and microspheres cross-linked by glucose,dextran,oxidized glucose,and oxidized dextran were prepared and their swelling kinetics were determined as well.The encapsulation efficiency and drug loading rate were determined by UV spectrophotometry with aspirin and bovine serum albumin(BSA)as drug models respectively.The release rates of gelatin microspheres in simulated body were determined.RESULTS:The swelling degrees of gelatins cross-linked by glucose,oxidized glucose,dextran,and oxidized dextran were 204%,246%,166%,and 233%,respectively.The average drug-loading rate of aspirin gelatins was 8.73% as compared with 4.05% of BSA gelatin microspheres,with the average encapsulation rate of 62.55% vs.31.40%.The accumulate release rates in 2 h were 30%,14%,76%and 73% for aspirin gelatin microspheres as compared with 97.2%,86.6%,60.8% and 50.1% for BSA.CONCLUSION:All of 4 kinds of sugars can replace chemical crosslinkers for the preparation of gelatin microspheres.The natural sugar gelatin microspheres were superior to oxidized sugar in sustained release effect.

A 1 3kb DNA fragment was amplified in DNA samples extracted from periwinkle showed yellows The amplified fragment was ligated into pGEM T easy vector and then transformed into JM109 strain of E coli Cloned DNA fragments were verified by PCR, restriction endonuclease ( Eco RI) digestion and sequence analysis The result revealed that the ribosomal protein gene of PY strain consists of 1244 base pairs, which contains the entire rp l22 gene encoding 129 amino acids and rps3 gene encoding 252 amino acids These two genes are overlap The character of ribosomal protein gene of PY strain is very resemble with that of other phytoplasmas

The efficacy and safety of uric-acid-lowering therapy (UALT) on slowing the progression of chronic kidney disease (CKD) accompanied by hyperuricemia were assessed. We searched Cochrane Library, PubMed, EMbase, CNKI, Wanfang and Vip databases up to November 15, 2012 for randomized controlled trials (RCTs) which compared the effect of UALT to control therapy in hyperuricemic patients secondary to CKD, and then performed quality evaluation and meta-analysis on the included studies. Seven RCTs involving 451 cases were included. UALT delayed the increase of serum creatinine (MD=-62.55 μmol/L, 95% CI: -98.10 to -26.99) and blood urea nitrogen (MD= -6.15 mmol/L, 95% CI: -8.17 to -4.13) as well as the decrease of glomerular filtration rate [MD=5.65 mL/(min·1.73 m2), 95% CI: 1.88 to 9.41], decreased systolic blood pressure (SBP) (MD= -6.08 mmHg, 95% CI: -11.67 to -0.49), and reduced the risk of the renal disease progression (RR=0.30, 95% CI: 0.19 to 0.46). However, there was no statistically significant difference in 24-h urinary protein quantity and diastolic blood pressure (P>0.05). We identified that UALT could delay the progression of CKD with secondary hyperuricemia. And this also indirectly proved that hyperuricemia was a risk factor for the CKD progression.

OBJECTIVETo analyze the data of angle variation on traction based on a finite element model of complete cervical spine with straight physiological curvature, and try to give experimental reference and suggestion in treating cervical spondylosis.

METHODSA 43-year-old female patient with straight cervical spine was chosen and the CT scan data were collected. By using specially designed modeling system, a high quality finite element model of complete cervical spine with straight physiological curvature is generated,which included ligament and muscle according to anatomy. After the model was confirmed, traction was loaded with angle 0 degree, anterior 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, to observe the data of distance change on between adjacent intervertebral foramen, processus articularis, uncovertedral joint, intervertebral discs, and stress of anulus fibrosus and nucleus pulposus.

RESULTSWhen the angle was 0 degrees-15 degrees, the distance between intervertebral foramen, Luschka joint and processus articularis posterioris was enlarged, the tensile stress was adequate and compressive stress was small. It met the clinical requests.

CONCLUSION0 degree-15 degrees anterior position is suggested for the treatment of cervical spondylosis.

Adult ; Biomechanical Phenomena ; Cervical Vertebrae ; anatomy & histology ; surgery ; Female ; Finite Element Analysis ; Humans ; Spondylosis ; surgery ; Traction ; methods

Objective To explore the diagnostic value of parametric imaging of contrast-enhanced ultrasound(CEUS) on recurrent hepatocellular carcinoma after liver transplantation.Methods CEUS images of 41 recurrent hepatocellular carcinoma after liver transplantation was analyzed by Sonoliver CAP software.The color code image,curve image and quantitative parameter of DVP of each recurrence lesion was recorded,then typed and analyzed statistically.Results The DVP patterns were classified into 3 types,they were washed out types,non-washed out types and negative types.The washed out types,non-washed out types and negative types on color code image and curve image of DVP were 70.73％ (29/41),24.39％ (10/41),4.88％ (2/41) and 63.41％(26/41),34.15％ (14/41) and 2.44％ (1/41) respectively.The maximum intensity,rise time,time to peak of the recurrence lesion and the surrounding liver parenchyma were (149.98± 65.29) ％,(12.32 ± 5.83)s,(13.01 ±6.07)s and (100±0.00)％,(26.10± 10.81)s,(29.69± 11.60)s respectively,and showed statistical differences (P ＜0.05).Conclusions The difference of blood perfusion between the recurrence lesion and the surrounding liver parenchyma can be displayed by DVP's dynamic,direct and quantitative imaging,which can be used to provide valuable information about the detection of intrahepatic lesion of recurrence after liver transplantation.

Nitrobenzene is one of the toxic compounds. Much work had focused on biodegradation of it sofar. Two main pathways for nitrobenzene biodegradation, oxidative and partial reductive pathways, were reviewed in this article. The mechanism of these pathways including involved enzymes and genes was introduce in details. Comparative analysis of the pathways would provide basis for the development and application of biodegradation technology for nitrobenzene and other organic pollutants.

Aim To establish a model of the vascular endothelial cell (VEC) injury in SDrats.Methods SD rats were randomly divided into the control and the modelgroups. The model rats were injected with adrenaline diluted to 2. 5 times 0. 05 mg?100 g-1 (tid) for 5 d continously. From the 4th d, they were irritated for 5 min in the0℃ cold-water in the middle between adrenaline injections.The control rats weregiven 0. 9% NS as above. At 6th d, blood samples were taken from carotid arteries ofthe rats and the CEC counts, t - PA、PAI activities, 6-keto-PGF1? concentrations andthe platelet aggregation rate(max) were detected respectively. Results In the modelgroup, as compared with those in the control group, t - PA activity and 6-keto-PGF1?concentration decreased significantly(P

Objective To investigate the epidemiology of bacterial infections after liver transplantation and anaIyze the antimi- crobial susceptibility of major pathogens to provide reference for clinical therapy.Methods A retrospective survey was conduc ted in 174 patients who underwent liver transplantation during 2001 and 2004.Identification and susceptibility of pathogens were assayed by Microscan Walkaway 40 Automatic System.Results Infection was identified in 59.8% of the 174 patients after liver transplantation.A total of 218 non-duplicate strains were isolated.Most infections were caused by single pathogen.The infection was frequently identified in respiratory tract,biliary tract,blood stream or intra-abdominal cavity.The top 5 patho- gens were Acinetobacter baumannii,Staphylococcus aureus,Pseudomonas aeruginosa,Stenotrophomonas maltophilia and Escherichia coli.Gram-negative bacilli were usually resistant to multiple antimicrobial agents,but less resistant to piperacillin- tazobactam or imipenem.Most of S.aureus isolates were methicillin-resistant,which were susceptible to vancomyein.Conclu- sions Pathogens of postoperative infections in liver transplantation recipients are mostly multi-drug resistant.The microbiologi- cal surveillance is important for guiding clinical therapy.

Background There is multi-dimensional order of spatial stereopsis perception in human,however,current stereopsis examination is zero-order of position disparity.A multi-dimensional space perception model is very important for the detection of stereoacuity.Objective This study was to screen the deficit of zero-order,first-order,second-order multi-dimensional spatial stereopsis perception in amblyopia and strabismus children and to explore the association of zero-order,first-order,second-order spatial perception deficit.Methods Multidimensional spacial perception was examined in 79 children aged 4-14 years in Beijing Children' s Hospital.Nineteen normal children,19 children with ametropia amblyopia,12 children with anisometropic amblyopia,18 children with strabismus and 11 children with strabismus combined amblyopia were included this study.The random-dot and line spatial stereopsis perception in zero-order,first-order and second-order were examined with a new system of multidimensional space perception screening.Written informed consent was obtained from each subject or custodian before any ocular examination associated with this study.Results Absence of zero-order,first-order,second-order random-dot channel was found in 24 children (24/79,30.4％),18 children (18/79,22.8％) and 24 children (24/79,30.4％) respectively,with an average percentage of 27.9％.Absence of zero-order,first-order,second-order line channel was examined in 37 children (37/79,46.8％),37 children (37/79,46.8％),32 children (32/79,40.5％),with an average percentage of 44.7％.In the children with a deficiency of the zero-order spatial perception,the children who still remained the first-order or/and second-order spatial perception of random-dot accounted for 41.6％ and that of lines accounted for 43.2％.In children without deficiency of zero-order random-dot or lines spatial space perception,deficiency of first-order and/or second-order spatial perception was in 37.5％ children.Various order spatial perception deficiency was seen in children suffering from amblyopia or strabismus compared with normal group(P ＜ 0.05).Conclusions There exists spatial perception deficiency in children with amblyopia or strabismus.The patients with zero-order spatial perception absence partially remain a first-order or/and second-order spatial perception;while the patients with normal zero-order spatial perception might have first-order or second-order spatial perception deficiency.The multi-dimensional space perception model has a directive role for the training of visual information process and the treatment of spatial perceptual learning in children with amblyopia or strabismus.

OBJECTIVETo evaluate the modified Stoppa approach in treatment of pelvic and acetabular fractures.

METHODSFrom March 2010 to May 2012,16 patients with pelvic fractures and 7 patients with acetabutar fractures were treated by open reduction and internal fixation through the modified Stoppa approach,involving 18 males and 5 females with an average age of 39 years ranging from 17 to 65. By Tile classification, 16 cases of pelvic fractures included 1 case of B1, 2 of B2, 3 of B3, 4 of C1-1, 2 of C1-2, 2 of C1-3, and 1 of C2. By Letournel classification, 7 cases of acetabular fractures included 1 case of anterior column fractures, 1 of transverse fractures, 2 of type T, 1 of anterior column plus posterior transverse fractures, and 2 cases of both columns fractures. For 16 pelvic fractures, the modified Stoppa approach was used exclusively in 9 cases,in combination with the iliac fossa approach in 6 cases, and in combination with the posterior approach in 1 case. For 7 acetabular fractures, the modified Stoppa approach was used exclusively in 4 cases, in combination with the Kocher-Langenbeck approach in 2 cases, and in combination with the Kocher-Langenbeck and iliac fossa approaches in 1 case of both columns fractures.

RESULTSThe average operation time was 130 min (50 to 350 min) and the blood loss averaged 320 ml (100 to 1200 ml). There were no operative complications. The reductions of the pelvic and acetabular fractures were all excellent and good. Twenty-one patients were followed-up from 4 to 24 months (averaged 8 months). The fractures were all healed,the fracture healing time was 2.5 to 5 months (means 3.2 months). Among them, 1 case occurrenced screw loosening, 1 case had mild limited of hip flexion, no case had plate breakage and lateral ventral syndrome.

CONCLUSIONThe modified Stoppa approach can be used to treat pelvic and acetabular fractures effectively, and it has advantages of easy manipulation and a low complication rate.

Acetabulum ; injuries ; surgery ; Adolescent ; Adult ; Aged ; Female ; Fracture Fixation, Internal ; adverse effects ; methods ; Fracture Healing ; Fractures, Bone ; surgery ; Humans ; Male ; Middle Aged ; Pelvic Bones ; injuries ; surgery