To develop a three-dimensional porous film of human hair keratin (HHK)-collagen sponge complex for use as a dermal substitute.The three components F, B, and Z derived from healthy human hair were weaved into a meshwork and integrated with purified soluble type I collagen extracted from bovine tendons to prepare a highly porous film with vacuum freeze-drying followed by secondary cross-linking with glutaraldehyde. The film was grafted beneath the dorsal skin in 21 SD rats (experimental group), with simple collagen sponge serving as the negative control. The rats receiving surgical operation but without graft served as the blank control. The graft and its surrounding tissue were harvested on days 3, 7 and at weeks 2, 4, 6, 8, 12 after implantation for evaluation of tissue compatibility, vascularization and degradation.The prepared collagen sponge film was semitransparent and porous. Three to 7 days after grafting, inflammatory reaction was relieved gradually, and several fibroblasts and blood vessels were found adherent to the grafts in the experimental groups. At week 4, the wounds healed in the experimental groups, and the fibroblasts were actively secreting collagen and the film degraded obviously with the appearance of elastic fibers. At weeks 6 and 8, new collagen fibers thickened and assumed regular arrangement, and the collagen sponge films disappeared completely. In the control groups, the changes were less obvious and total HHK degradation occurred till week 12.The degradable and absorbable HHK-collagen sponge film has relatively satisfactory tissue compatibility and can accelerate wound healing by stimulating cell proliferation and vascularization, showing the potential as an optimal dermal substitute.
In this paper,the reation between sheet shape and thickness distribution in width is set up including the influence of out tension based on measured tensions in works The influence of out tension to sheet shape is solved quantitatively It is important to improve the calculated accuracy of shape control
Objective:To compare clinical effectiveness of Hawley and vacuum-formed retainers(VFRs).Method: Patients were randomly allocated to either Hawley retainer or VFRs.All patients' dental casts taken at initially debonding and one year following retention were assessed in terms of Little index of irregularity.Result:There was a significant change in irregularity of incisors in the Hawley group than in the VRFs group after one year retention.Patients compliance was greater with VFRs for the first 6 months after debonding,and then the compliance of the two groups was similar.Conclusion:VFRs were more effective than Hawley retainer in holding the correction of labial segments.Reasons for noncompliance were different for the two groups.
Objective We propose a technique that can be easily performed and can produce excellent aesthetic aswell as good functional results. Methods In our method, three parts of the nipple tissue can be excised: the skin on top of the nipple,the upper circumferential part of the nipple column and the hypertrophic subcutaneous tissue and the lactiferous ducts can be protected well. Results This technique has been successfully used in 20 women with hypertrophic nipples. Conclusion This technique can correct any kind of hypertrophic nipple to normal size with good sensation and lactation.
Objective
To evaluate the efficacy of percutaneous nephrolithotomy combined with flexible ureteroscope via single 20 F renal channel in the treatment of renal staghorn calculi.
Methods
Data of 37 cases of renal staghorn calculi treated by percutaneous nephrolithotomy combined with flexible ureteroscope via single 20 F renal channel from January 2014 to August 2016 were analyzed retrospectively.There were 14 males and 23 females. Age ranged from 34 to 62 years with a mean of 46 years. The stones in 25 cases were located on the left side, 12 cases on the right side. The diameter of stones was between 3.3 cm to 6.0 cm, average (4.9±0.1) cm. All patients underwent single channel percutaneous nephrolithotomy combined with flexible ureteroscope under the guidance of ultrasound, using EMS and holmium laser fragment stones, and the channel of puncture was expanded to 20 F.
Results
Thirty-seven cases were set single 20 F renal channel and 36 cases were treated by percutaneous nephrolithotomy combined with flexible ureteroscope in one-stage. Single renal channels were set at the subrenal calyx in 34 cases (91.9%). The stone clearance rate in the first stage was 86.5%(32/37)and operation time was between 58 to 125 min with an average of (92±23) min. Postoperative hemoglobin decreased 3.2~9.5 g/L with an average of (5.7±1.8) g/L. The postoperative hospitalization time was 5 to 9 days with an average of (7±1) days. Three patients suffered from fever on surgery day, the body temperature was over 38.5℃. No renal perforation, hydrothorax, seroperitoneum, hemorrhoea and blood transfusion occurred.
Conclusion
Percutaneous nephrolithotomy combined with flexible ureteroscope via single 20 F renal channel has high stone clearance rate, mini-invasion and less operative time in the treatment of renal staghorn calculi.
Key words:
Percutaneous nephrolithotomy; Ureteroscope; Staghorn calculi; Retrospective analysis
In this paper,the characteristic,the research and the present status of the Polycarboxylic high performance water-reducing agent were introduced in brief.The adaptability of the HSP type Polycarboxylic high performance water-reducing agent to the reference cement,Yuexiu P·Ⅱ42.5R Portland cement,Huarun P·O42.5R ordinary portland cement was researched by the testing of fluidity of cement paste.The water-reducing ratio,the slump maintenance and workability of plain concrete,pumping concrete and high performance concrete with HSP Polycarboxylic high performance water-reducing agent were researched.The effect of the HSP Polycarboxylic high performance water-reducing agent on the physical mechanics properties,shrinkage and durability of high performance concrete were studied.
With especially high single wave peak,large wave steepness,and typical characteristic of emerging suddenly,as a kind of ocean disaster,rogue waves still can not be explained or forecasted perfectly.This phenomenon has been paid more attention to by the people interested in sea and ocean all over the world,for its appalling danger and impassible forecast recently and its increasing trend induced by some reasons.The disastrous rogue wave and its danger are presented here at first.And then,from the definition of rogue wave,research methods,some corresponding conclusions and the understanding of this phenomenon is depicted.The purpose of this paper is providing some train of through for the people interested in this field.
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