Based on untermolecular splut G-quardruplex-hemun DNAzymes, a buosensor for detectuon of sulver uons and cysteune was developed wuth magnetuc nanopartucles ( MNPs ) as carruer to ummobuluze the DNA probes. Sunce Ag+ chelates guanune bases at the bundung sutes whuch are unvolved un G-quadruplex formatuon, the presence of Ag+ may unhubut G-quartets connected by Hoogsteen-type base paurung and dusrupt G-quadruplexes structures, whuch decreases the peroxudase actuvuty of G-quadruplex-hemun DNAzymes that effucuently catalyze H2 O2-meduated reactuons, such as the oxudatuon of ABTS ( 2, 2'-azunobus ( 3-ethylbenzothuozolune)-6-sulfonuc acud) by H2 O2 . Moreover, un the presence of L-cysteune, ut was used as a competutor by the strongly Ag-S to release Ag+ from G-ruch olugonucleotudes, promotung the reformatuon of G-quadruplexes and uncreasung the peroxudase actuvuty, whuch catalyzes the ABTS-H2 O2 reactuon system. In thus experument, the effucuent separatuon from real sample was achueved usung magnetuc nanopartucles as a solud phase carruer to effectuvely uncrease the detectuon sensutuvuty and decrease the background sugnal. Under the optumum condutuons, a hugh lunear relatuonshup between the UV absorbance and the Ag+ concentratuon was establushed un the range of 0. 5-100 nmol/L wuth a detectuon lumut of 0. 2 nmol/L. The calubratuon curve of cysteune was udentufued un the range from 0. 1 to 80 nmol/L and the detectuon lumut was as low as 0. 04 nmol/L.

To study bioadhesive property of carbomer 934 in dog alimentary tract, carbomer 934 and ethylcellulose were radiolabelled with technetium-99 m. The gastrointestinal emptying rate of these materials was measured by the technique of gamma scintiscan. The results showed that the empty rate of adhesive material (carbomer 934) was remarkably slower in dog alimentary tract compared to nonadhesive material (ethylcellulose). It is concluded that, in dog, the interaction between gastrointestinal mucus layer and adhesive material or nonadhesive material was significantly different. Carbomer 934 had stronger bioadhesive property in vivo than that of ethylcellulose.
Acrylic Resins ; pharmacokinetics ; Animals ; Cellulose ; analogs & derivatives ; pharmacokinetics ; Digestive System ; diagnostic imaging ; Dogs ; Gamma Cameras ; Gastric Emptying ; Intestinal Mucosa ; metabolism ; Radioimmunodetection

Objective To compaire the physical characteristics of semen morphology before and after semen coagulation-liquefaction under microscope and understand the significance of these characteristics for the determination of semen liquefaction.Methods Semens were placed in sperm counting chamber immediately after collection.The morphological changes of the seminal gelatinous substance during liquefaction were observed under microscope and analyzed.Results Morphological changes during semen liquefaction can be clearly observed.Among 32 samples of semen,forward sperm progression and motility were (30.3?12.4)% and (45.0?14.9)%,(44.9?12.7)% and (59.0?15.3)%,before and after the liquefaction,respectively.The differences were statistically significant (t=-1.130,5.023,P0.05).Conclusions Microscopic observation of the seminal gelatinous substance is a simple and feasible method for objective measurement of sperm liquefaction.These findings suggest it may provide pathological significance on semen liquefaction abnormality in infertility clinic.

Objective To explore the curative effect of fibular flap with limbs composite soft-tissue.Methods From February,2013 to February,2016,13 cases with body severe trauma patients were treated,which including 5 cases of upper limbs and 8 cases of lower limbs,and all existed bone defect,soft tissue defect and trunk vessel defect.Three cases with limbs distal non blood supply were emergency treated with debridment and flow-through fibular flap transplantation renovation,peroneal artery repairing defective blood vesscls to rcstorc limbs distal blood supply,fibular flap repairing bone defect,skin flap repairing soft tissue defect.The limb blood supply for other 10 cases were in good condition,but one case with main artery defect did the second phase of fibular flap transplantation and repaired defective blood vessels,bone and skin soft tissue synchronously according to wound condition.According to the postoperative observation for flap survival and appearance,X-ray films to observe fracture healing after 6 weeks,three months and 6 months of operation as well as evaluating limb function recovery,then analyzed the results.Results Flaps survived successfully for 11 cases,and flaps for the other 2 cases were partial necrosis.One Case was edge flap necrosis,heal scabby after dressing,and the other case was necrosis for 1/3 of the area,but the deep fascia survival,and the skin graft healing after dressing.One case with forearm rolling was in vascular crisis after operation,but tbe crisis was relieved after detection,and fingers blood supply was recovered.All the patients were followed up for 6 to 36 months(mean,14 months).All flaps were survived,fractures healed well and limbs distal blood supply was good.Bone healing time was 8 to 24 weeks,and patients with lower limbs injury could bear load after 3 to 8 months.Lower limbs restored walking function.Upper limbs and hands restored rotation function.Transplant flapshad good elasticity and satisfactory appearance.Conclusion Using fibular flap to repair defective blood vessels,bone and soft tissue synchronously,not only can rescue the limbs on the verge of amputation,but also can repair defective composite tissue and get a good prognosis.It is an effective method for open injuries severely treatment in clinic.

Objective To summarize the technique and managements of complications in endovascular embolization on intracranial aneurysm with Guglielmi detachable coils(GDC),and to evaluate the effect of the treatment.Methods One hundred and thirty six cases with Aneurizym were treated using GDC to embolize the aneurismal sac via femoral artery approach.Results One hundred and thirty six aneurysms were cured.Of them 132 cases recovered clinically,4 patients died.The mortality was 2.9%. The sac of 123 aneurysms were embolizied at 100%,8 cases with 95% embolization,5 with 90% embolization.3 aneurysms reptured during the embolization,cerebral vasospasm happened in 7 eases. microcoil escaped in 2 case.Three recurring cases were cured after second GDC embolization.The technique-related complications occured in 13 cases.No re-bleeding occurred during the 6 to 54-month follow-up.Conclusion Endovascular embolization of intracranial aneurysm with coils is a safe and effective treatment for intracranial aneurysm.Advances in Techniques and treating the complications correctly would decrease the complications and improve future outcomes.

OBJECTIVETo explore the possibilities of bone marrow stromal cells (MSCs) to adopt Schwann cell phenotype in vitro and in vivo in SD rats.

METHODSMSCs were obtained from tibia and femur bone marrow and cultured in culture flasks. Beta-mercaptoethanol followed by retinoic acid, forskolin, basic-FGF, PDGF and heregulin were added to induce differentiation of MSCs'. Schwann cell markers, p75, S-100 and GFAP were used to discriminate induced properties of MSCs' by immunofluorescent staining. PKH-67-labelled MSCs were transplanted into the mechanically injured rat sciatic nerve, and laser confocal microscopy was performed to localize the PKH67 labelled MSCs in the injured sciatic nerve two weeks after the operation. Fluorescence PKH67 attenuation rule was evaluated by flow cytometry in vitro.

RESULTSMSCs changed morphologically into cells resembling primary cultured Schwann cells after their induction in vitro. In vivo, a large number of MSCs were cumulated within the layer of epineurium around the injured nerve and expressed Schwann cell markers, p75, S-100, and GFAP.

CONCLUSIONMSCs are able to support nerve fiber regeneration and re-myelination by taking on Schwann cell function, and can be potentially used as possible substitutable cells for artificial nerve conduits to promote nerve regeneration.

Animals ; Biomarkers ; analysis ; Bone Marrow Cells ; cytology ; Cell Differentiation ; Cells, Cultured ; Flow Cytometry ; Fluorescent Antibody Technique, Indirect ; Fluorescent Dyes ; Glial Fibrillary Acidic Protein ; analysis ; Morphogenesis ; Organic Chemicals ; analysis ; Phenotype ; Rats ; Receptor, Nerve Growth Factor ; analysis ; S100 Proteins ; analysis ; Schwann Cells ; cytology ; metabolism ; Sciatic Nerve ; cytology ; injuries ; Stromal Cells ; cytology ; metabolism ; transplantation

OBJECTIVETo describe the rule of the schwann cell proliferation after peripheral nerve injury in detail and to discover the effect of neuroanastomosis.

METHODSThe model of rat sciatic injury was made, with neuroanastomosis on the left side and right side untreated. Then draw the materials 24, 48 h, 4, 7, 14, 21 d after surgery. And immunohistological stain counted the schwann cell per view with Qwin software of Leica Ltd.

RESULTSThe number of schwann cell increased obviously 4 d after surgery and reached the peak in 7 d. Then it fell down and the neuroanastomosis group changed slower and fibroblast hyperplasia in the untreated.

CONCLUSIONSThe axon support is essential for the schwann cell. The precise rule is help for study on neurotrophic factor.

Anastomosis, Surgical ; Animals ; Cell Proliferation ; Immunohistochemistry ; Male ; Rats ; Rats, Sprague-Dawley ; Schwann Cells ; cytology ; Sciatic Nerve ; injuries ; pathology ; surgery ; Time Factors

BACKGROUNDThe treatment for long bone defects has been a hot topic in the field of regenerative medicine. This study aimed to evaluate the therapeutic effects of calcium sulfate (CS) combined with platelet-rich plasma (PRP) on long bone defect restoration.

METHODSA radial bone defect model was constructed through an osteotomy using New Zealand rabbits. The rabbits were randomly divided into four groups (n = 10 in each group): a CS combined with PRP (CS-PRP) group, a CS group, a PRP group, and a positive (recombinant human bone morphogenetic protein-2) control group. PRP was prepared from autologous blood using a two-step centrifugation process. CS-PRP was obtained by mixing hemihydrate CS with PRP. Radiographs and histologic micrographs were generated. The percentage of bone regenerated bone area in each rabbit was calculated at 10 weeks. One-way analysis of variance was performed in this study.

RESULTSThe radiographs and histologic micrographs showed bone restoration in the CS-PRP and positive control groups, while nonunion was observed in the CS and PRP groups. The percentages of bone regenerated bone area in the CS-PRP (84.60 ± 2.87%) and positive control (52.21 ± 4.53%) groups were significantly greater than those in the CS group (12.34 ± 2.17%) and PRP group (16.52 ± 4.22%) (P < 0.001). In addition, the bone strength of CS-PRP group (43.10 ± 4.10%) was significantly greater than that of the CS group (20.10 ± 3.70%) or PRP group (25.10 ± 2.10%) (P < 0.001).

CONCLUSIONCS-PRP functions as an effective treatment for long bone defects through stimulating bone regeneration and enhancing new bone strength.

Animals ; Bone Regeneration ; drug effects ; Calcium Sulfate ; pharmacology ; Male ; Platelet-Rich Plasma ; Rabbits

OBJECTIVETo improve the safety and accuracy of trans-pedicle internal fixation for cervical vertebra by the parameter data measuring by CT reconstruction.

METHODSThirty volunteers were enrolled and be subjected to high-speed spiral CT for getting the data of C3-C7. The data included pedicle point-midline distance, pedicle sponge width, pedicle angle. The cervical vertebra pedicle morphology were reconstructed.

RESULTSReconstructed CT image data displayed that pedicle sponge width become larger and larger from C3 to C7; the pedicle depth didn't change significantly even from C3 to C7; pedicle angle become small from C3 to C7 and the range is from 33.76 degrees to 47.20 degrees; pedicle point-midline distance were almost similar even from C3 to C7. There were not statistical differences between the right side and the left side, but there were statistical differences between man and woman.

CONCLUSIONReconstructed CT image can provide useful data for clinical cervical vertebra trans-pedicle internal fixation.

Adult ; Bone Screws ; Cervical Vertebrae ; anatomy & histology ; diagnostic imaging ; Female ; Fracture Fixation, Internal ; instrumentation ; methods ; Humans ; Image Processing, Computer-Assisted ; Male ; Middle Aged ; Tomography, Spiral Computed ; methods

OBJECTIVETo discuss the efficacy of total elbow replacement in the treatment of complex distal humeral fractures.

METHODSFrom May 2005 to October 2008 12 patients were retrospectively studied who were diagnosed complex fractures of the distal humerus and treated by total elbow replacement (Coonrad-Marrey). The mean age was 60 years old, the mean follow-up time was 12 months. According to AO classification, there was 3 C2 and 9 C3. The study included: pain evaluation, range of motion, elbow stability, muscle strength, complications, Mayo elbow score, DASH score, radiological assessment of ectopic bone formation and loosening.

RESULTSTwo cases with mild pain. The mean flexion is 98.3 degrees, extension limit is 17.9 degrees, mean pronation is 82.9 degrees and supination is 70.8 degrees. All joints were stable postoperatively. All patients were satisfied with the outcome. There was 1 case of superficial soft tissue nonhealing and 2 cases of ulnar nerve symptoms. No ectopic bone formation or loosening was found. Mayo elbow score was 3 cases of excellent and 9 cases of good. The mean DASH score was 41.3.

CONCLUSIONTotal elbow replacement can be used in such conditions as severe osteoporosis, severe comminution that internal plates can not get stable fixation, severe cartilage damage (because of fracture or inflammatory arthritis) that indicate traumatic or inflammatory arthritis.

Adult ; Aged ; Aged, 80 and over ; Arthroplasty, Replacement, Elbow ; Female ; Follow-Up Studies ; Humans ; Humeral Fractures ; surgery ; Male ; Middle Aged ; Retrospective Studies ; Treatment Outcome