Dynamic Analysis of Hydrodynamic Behavior of A Flatfish Cage System Under Wave Conditions

This paper presents a simulation model based on the finite element method. The method is used to analyze the motion response and mooring line tension of the flatfish cage system in waves. The cage system consists of top frames, netting, mooring lines, bottom frames, and floats. A series of scaled physical model tests in regular waves are conducted to verify the numerical model. The comparison results show that the simulated and the experimental results agree well under the wave conditions, and the maximum pitch of the bottom frame with two orientations is about 12o. The motion process of the whole cage system in the wave can be described with the computer visualized technology. Then, the mooring line tensions and the motion of the bottom frame with three kinds of weight are calculated under different wave conditions. According to the numerical results, the differences in mooring line tensions of flatfish cages with three weight modes are indistinct. The maximum pitch of the bottom frame decreases with the increase of the bottom weight.

Dynamic Behavior and Deformation Analysis of the Fish Cage System Using Mass-Spring Model

Fish cage systems are influenced by various oceanic conditions, and the movements and deformation of the system by the external forces can affect the safety of the system itself, as well as the species of fish being cultivated. Structural durability of the system against environmental factors has been major concern for the marine aquaculture system. In this research, a mathematical model and a simulation method were presented for analyzing the performance of the large-scale fish cage system influenced by current and waves. The cage system consisted of netting, mooring ropes, floats, sinkers and floating collar. All the elements were modeled by use of the mass-spring model. The structures were divided into finite elements and mass points were placed at the mid-point of each element, and mass points were connected by springs without mass. Each mass point was applied to external and internal forces, and total force was calculated in every integration step. The computation method was applied to the dynamic simulation of the actual fish cage systems rigged with synthetic fiber and copper wire simultaneously influenced by current and waves. Here, we also tried to find a relevant ratio between buoyancy and sinking force of the fish cages. The simulation results provide improved understanding of the behavior of the structure and valuable information concerning optimum ratio of the buoyancy to sinking force according to current speeds.

Dynamic Analysis for the Global Performance of An SPM-Feeder-Cage System Under Waves and Currents

In the present study, the dynamic response of a coupled SPM-feeder-cage system under irregular waves and shear currents is analyzed. A numerical model is developed by using the commercial software Orca Flex. Hydrodynamics coefficients of the vessel are calculated by using a 3D diffraction/radiation panel program. First- and second-order wave forces are included in the calculations. Morison equation is used to compute the drag force on line elements representing the net. Drag coefficients are determined at every time step in the simulation considering the relative normal velocity between the structural elements and the fluid flow. The dynamic response of the coupled system is analyzed for various environments and net materials. The results of the study show the effects of solidity ratio of the net and vertical positions of the cage on the overall dynamic response of the system, confirming the viability of this type of configuration for future development of offshore aquaculture in deep waters.

Azdel，Inc．被允许使用Cage System技术生产各类壁板

近期，通用电气公司与PPG Industries（双方各持50％的股份）的合资公司Azdel，Inc．获得了法国RocTool公司颁发的独家许可证，允许它使用后者的高科技Cage System技术生产飞机．火车．休旅车（RV）及其他运输车辆的外部车身覆盖件。

Enhancing the activity,selectivity,and recyclability of Rh/PPh_(3) system‐catalyzed hydroformylation reactions through the development of a PPh_(3)‐derived quasi‐porous organic cage as a ligand

In contrast to heterogeneous network frameworks(e.g.,covalent organic frameworks and metal‐organic frameworks)and porous organic polymers,porous organic cages(POCs)are soluble molecules in common organic solvents that provide significant potential for homogeneous catalysis.Herein,we report a triphenylphosphine‐derived quasi‐porous organic cage(denoted as POC‐DICP)as an efficient organic molecular cage ligand for Rh/PPh_(3) system‐catalyzed homogeneous hydroformylation reactions.POC‐DICP not only displays enhanced hydroformylation selectivity(aldehyde selectivity as high as 97%and a linear‐to‐branch ratio as high as 1.89)but can also be recovered and reused via a simple precipitation method in homogeneous reaction systems.We speculate that the reason for the high activity and good selectivity is the favorable geometry(cone angle=123.88°)and electronic effect(P site is relatively electron‐deficient)of POC‐DICP,which were also demonstrated by density functional theory calculations and X‐ray absorption fine‐structure characterization.

Direct Z-scheme photochemical hybrid systems:Loading porphyrin-based metal-organic cages on graphitic-C_(3)N_(4) to dramatically enhance photocatalytic hydrogen evolution

The rational design of photochemical molecular device(PMD)and its hybrid system has great potential in improving the activity of photocatalytic hydrogen production.A series of Pd6L3 type metal-organic cages,denoted as MOC-Py-M(M=H,Cu,and Zn),are designed for PMDs by combining metalloporphyrin-based ligands with catalytically active Pd^(2+)centers.These metal-organic cages(MOCs)are first successfully hybridized with graphitic carbon nitride(g-C_(3)N_(4))to form direct Z-scheme heterogeneous MOC-Py-M/g-C_(3)N_(4)(M=H,Cu,and Zn)photocatalysts via π-πinteractions.Benefiting from its better light absorption ability,the MOC-Py-Zn/g-C_(3)N_(4) catalyst exhibits high H_(2) production activity under visible light(10348μmol g^(-1) h^(-1)),far superior to MOC-Py-H/g-C_(3)N_(4) and MOC-Py-Cu/g-C_(3)N_(4).Moreover,the MOC-Py-Zn/g-C_(3)N_(4) system obtains an enhanced turn over number(TON)value of 32616 within 100 h,outperforming the homogenous MOC-Py-Zn(TON of 507 within 100 h),which is one of the highest photochemical hybrid systems based on MOC for visible-light-driven hydrogen generation.This confirms the direct Z-scheme heterostructure can promote effective charge transfer,expand the visible light absorption region,and protect the cages from decomposition in MOC-Py-Zn/g-C_(3)N_(4).This work presents a creative example that direct Z-scheme PMD-based systems for effective and persistent hydrogen generation from water under visible light are obtained by heterogenization approach using homogeneous porphyrin-based MOCs and g-C_(3)N_(4) semiconductors.

Hydrodynamic coefficients of a simplified floating system of gravity cage in waves

Numerical simulation and experimental tests were carried out to examine the hydrodynamic behaviors of a double-column floating system of gravity cage under wave conditions. A floating system of gravity cage can be treated as a small-sized floating structure when compared with the wavelengths. The main problem in calculating the wave loads on the small-sized floating structure is to obtain the reasonable force coefficients, which may differ from a submerged structure. In this paper, the floating system of gravity cage is simplified to a 2D problem, where the floating system is set symmetrically under wave conditions. The motion equations were deduced under wave conditions and a specific method was proposed to resolve the problem of wave forces acting on a small-sized floating system of gravity cage at water surface. Results of the numerical method were compared with those from model tests and the hydrodynamic coefficients Cn and Cr were studied. It is found that Cn ranges from 0.6 to 1.0 while Cr is between 0.4 and 0.6 in this study. The results are useful for research on the hydrodynamic behavior of the deep-water gravity sea cages.

Harmonics in the Squirrel Cage Induction Motor Analytic Calculation Part III: Influence on the Torque-speed Characteristic

The harmonics that appear in the squirrel cage asynchronous machine have been discussed in great detail in the literature for a long time. However, the systematization of the phenomenon is still pending, so we made an attempt to fill this gap in the previous parts of our study by elaborating formulas for calculation of parasitic torques. It was a general demand among those who work in this field towards the author to verify his formulas with measurements. In the literature, it seems,only one detailed, purposeful series of measurements has been published so far, the purpose of which was to investigate the effect of the number of rotor slots on the torque-speed characteristic curve of the machine. The main goal of this study is to verify the correctness of the formulas by comparing them with the referred series of measurements. Relying on this, the expected synchronous parasitic torques were developed for the frequently used rotor slot numbers-as a design guide for the engineer.Thus, together with our complete table for radial magnetic pull published in our previous work, the designer has all the principles, data and formulas available for the right number of rotor slots for his given machine and for the drive system. This brings this series of papers to an end.

Effects of rearing system(floor vs.cage)and sex on performance,meat quality and enteric microorganism of yellow feather broilers

This study investigated the effects of floor and cage rearing systems on performance,meat quality,and enteric microorganisms of male and female yellow feather broilers.Two hundred Xueshan chickens(42 days old;100 of each sex)were divided into four groups,according to sex and rearing system(stainless-steel cage or litter floor).Male and cage-reared broilers exhibited better(P<0.001)performance and higher(P≤0.001)eviscerated percentage than female and floor-reared broilers.The interaction between rearing system and sex had an effect(P<0.05)on the percentage of breast and thigh muscles.Female floor-reared broilers presented the highest(P<0.02)percentage of breast and thigh muscles among all the groups.In both sexes,the abdominal fat content in cage-reared broilers was higher(P<0.01)than that in floor-reared broilers.Female cage-reared broilers exhibited better(P<0.05)meat quality of breast muscle than other groups.An analysis of welfare observations indicated that the feather quality of floor-reared broilers was better(P<0.01)than that of cage-reared broilers,whereas the gait scores were not significantly affected(P>0.05)by rearing system.The enteric microbiota assessment by 16 S rRNA amplicon-based sequencing showed that Firmicutes,Proteobacteria,and Bacteroidetes were the most prevalent phyla in both rearing systems,and that the cecum was relatively stable in terms of microbiome composition.Floor-reared broilers exhibited a richer diversity of bacteria in the intestinal tract than cage-reared broilers,while alpha diversity was not significantly different(P>0.05)among the groups.The ratio of Bacteroidetes to Firmicutes and the abundance of Helicobacter and Romboutsia could potentially affect the production of broilers.These findings indicate that cage rearing improved the production of male Xueshan broilers,which may be due to the difference in enteric microbiota between cage and floor rearing systems.

基于MRI椎体和终板骨质量评分对经椎间孔椎间融合术后cage沉降的预测价值

目的探讨基于MRI的椎体骨质量评分(vertebral bone quality score,VBQ)和终板骨质量评分(endplate bone quality score,EBQ)在经椎间孔腰椎椎间融合(transforaminal lumbar interbody fusion,TLIF)术后cage沉降中的预测价值。方法因腰椎退行性疾病在我院行TLIF手术的226例患者,根据术后有无cage沉降将患者分为沉降组和非沉降组,比较两组患者VBQ和EBQ评分。通过多元回归分析cage沉降的危险因素,并根据受试者工作特征曲线下面积(AUC)评估VBQ和EBQ预测TLIF术后cage沉降的能力。结果226例患者中30例出现术后cage沉降。沉降组VBQ(3.8±0.4)分,EBQ(5.1±0.7)分,明显高于非沉降组(3.1±0.6)分和(4.2±1.0)分,差异有统计学意义(P<0.001)。多元回归分析显示VBQ(OR=4.258,95%CI:1.983~9.142,P<0.001)和EBQ(OR=1.971,95%CI:1.212~3.203,P=0.006)评分越高,发生cage沉降风险也越大。受试者工作特征曲线结果显示VBQ的AUC为0.843,EBQ的AUC是0.864。VBQ和EBQ预测cage沉降的最佳阈值分别为3.480(敏感性90%;特异性75.5%)和4.620(敏感性96.7%;特异性74.5%)。结论术前VBQ或EBQ评分越高,TLIF术后发生cage沉降风险越大。其中EBQ可能是一个更好的预测融合术后cage沉降的指标。

Selective photosynthesis of Z-olefins through crystalline metal-organic cage-initiated expeditious cascade reactions

The semi-hydrogenation of alkyne to form Z-olefins with high conversion and high selectivity is still a huge challenge in the chemical industry.Moreover,flammable and explosive hydrogen as the common hydrogen source of this reaction increases the cost and danger of industrial production.Herein,we connect the photocatalytic hydrogen evolution reaction and the semihydrogenation reaction of alkynes in series and successfully realize the high selective production of Z-alkenes using low-cost,safe,and green water as the proton source.Before the cascade reaction,a series of isomorphic metal–organic cage catalysts(Co_(x)Zn_(8−x)L_(6),x=0,3,4,5,and 8)are designed and synthesized to improve the yield of the photocatalytic hydrogen production.Among them,Co_(5)Zn_(3)L_(6) shows the highest photocatalytic activity,with a H_(2) generation rate of 8.81 mmol g^(−1) h^(−1).Then,Co_(5)Zn_(3)L_(6) is further applied in the above tandem reaction to efficiently reduce alkynes to Z-alkenes under ambient conditions,which can reach high conversion of>98%and high selectivity of>99%,and maintain original catalytic activity after multiple cycles.This“one-pot”tandem reaction can achieve a highly selective and safe stepwise conversion from water into hydrogen into Z-olefins under mild reaction conditions.

Effects of anions on the structural regulation of Zn‑salen‑modified metal‑organic cage

By virtue of a 3∶1 complementary coordination strategy,a chiral heteroleptic metal-organic cage that con-tains divergent functional units,Pd‑R(Zn),was precisely constructed via self-assembly of monodentate variational Zn-salen ligands RZn and NADH(reduced nicotinamide adenine dinucleotide)mimic modified tridentate ligands with square-planar Pd ions.UV-Vis and luminescence spectra experiments reveal that different anions could selec-tively interact with different sites of Zn-salen modified metal-organic cages to achieve the structural regulation of cage compound,by using the differentiated host-guest electrostatic interactions of counter ions with metal-organic hosts.Compared to other anions,the presence of chloride ions caused the most significant fluorescence emission enhancement of Pd‑R(Zn),meanwhile,the UV-Vis absorption band attributed to the salen aromatic backbone showed an absorption decrease,and the metal-to-ligand induced peak displayed a blue shift effect.Circular dichro-ism and ^(1)H NMR spectra further demonstrate that the introduction of chloride anions is beneficial to keeping a more rigid scaffold.

Metal-organic cage as fluorescent probe for LiPF_(6)in lithium batteries

Lithium hexafluorophosphate(LiPF_(6)),the most commonly used lithium battery electrolyte salt,is vulnerable to heat and humidity.Quantitative and qualitative determination the variation of LiPF_(6)have always relied on advanced equipment.Herein,we develop a fast,convenient,high-selective fluorescence detection method based on metal-organic cages(MOC),whose emission is enhanced by nearly 20 times in the presence of LiPF_(6)with good stability and photobleaching resistance.The fluorescent probe can also detect moisture in battery electrolyte.We propose and verify that the luminescence enhancement is due to the presence of hydrogen bond-induced enhanced emission effect in cages.Fluorescent excitation-emission matrix spectra and variable-temperature nuclear magnetic resonance spectroscopy are employed to clarify the role of hydrogen bonds in guest-loaded cages.Density functional theory(DFT)calculation is applied to simulate the structure of host-guest complexes and estimate the adsorption energy involved in the system.The precisely matched lock-and-key model paves a new way for designing and fabricating novel host structures,enabling specific recognition of other target compounds.

Research of caged dynamics of clusters center atoms in Pd_(82)Si_(18) amorphous alloy

To date,there is still a lack of a comprehensive explanation for caged dynamics which is regarded as one of the intricate dynamic behaviors in amorphous alloys.This study focuses on Pd_(82)Si_(18)as the research object to further elucidate the underlying mechanism of caged dynamics from multiple perspectives,including the cage's lifetime,atomic local environment,and atomic potential energy.The results reveal that Si atoms exhibit a pronounced cage effect due to the hindrance of Pd atoms,resulting in an anomalous peak in the non-Gaussian parameters.An in-depth investigation was conducted on the caged dynamics differences between fast and slow Si atoms.In comparison to fast Si atoms,slow Si atoms were surrounded by more Pd atoms and occupied lower potential energy states,resulting in smaller diffusion displacements for the slow Si atoms.Concurrently,slow Si atoms tend to be in the centers of smaller clusters with coordination numbers of 9 and 10.During the isothermal relaxation process,clusters with coordination numbers 9 and 10 have longer lifetimes,suggesting that the escape of slow Si atoms from their cages is more challenging.The findings mentioned above hold significant implications for understanding the caged dynamics.

颈前路减压融合ROI-C^(TM)自锁系统治疗退行性颈椎病的Meta分析

目的:颈前路减压融合术是治疗退行性颈椎病的经典手术方式,钉板的使用增加了融合率及稳定性的同时,间接导致了邻近椎体退变和术后吞咽困难的发生。文章通过Meta分析方法比较ROI-C^(TM)自锁系统和传统融合器联合钉板内固定治疗退行性颈椎病患者的临床结果和并发症情况,为颈前路减压融合术中内固定方式的选择提供循证学支持。方法:检索中国知网、万方、维普、PubMed、Cochrane Library、Web of Science和Embase数据库,检索关于颈前路减压融合术中应用ROI-C^(TM)自锁系统与融合器联合钉板内固定治疗退行性颈椎病的中英文文献。检索时间范围为各数据库建库至2023年7月。由2名研究者严格按照纳入与排除标准选择文献,采用Cochrane偏倚风险工具对随机对照试验进行质量评价,NOS量表对队列研究进行质量评价。采用RevMan 5.4软件进行Meta分析。结局指标包括手术时间、术中出血量、日本骨科协会(Japanese Orthopaedic Association Scores,JOA)评分、颈椎功能障碍指数、C_(2)-C_(7)Cobb角、融合率、邻近椎体退变发生率、融合器沉降率和吞咽困难发生率。结果:共纳入13项研究,其中回顾性队列研究11项,随机对照试验2项,共1136例患者,ROI-C组569例,融合器联合钉板组567例。Meta分析结果显示:ROI-C组与融合器联合钉板组在手术时间(MD=-15.52,95%CI:-18.62至-12.42,P<0.00001),术中出血量(MD=-24.53,95%CI:-32.46至-16.61,P<0.00001),术后邻近节段退变率(RR=0.40,95%CI:0.27-0.60,P<0.00001)和术后总吞咽困难发生率(RR=0.18,95%CI:0.13-0.26,P<0.00001)均具有显著性差异。两者在术后JOA评分、颈椎功能障碍指数、C_(2)-C_(7)Cobb角、融合率和融合器沉降率方面无显著性差异(P≥0.05)。结论:在颈椎前路减压融合术中应用ROI-C^(TM)自锁系统与传统融合器联合钉板内固定治疗退行性颈椎病均可达到满意的临床效果,ROI-C^(TM)自锁系统操作更加简单,相比融合器联合钉板内固定能明显减少手术时间及术中出血量,在减少术后吞咽困难及邻近节段退变发生率等方面具有明显优势,对于跳跃型颈椎病及邻椎病翻修患者,更加推荐使用ROI-C^(TM)自锁系统。但鉴于其可能存在较高的沉降率,对于多节段且合并融合器沉降高危因素如骨质疏松、椎体终板破损的退行性颈椎病患者,仍建议使用融合器联合钉板内固定。

颈前路减压cage融合术与自体髂骨块植骨钛板内固定术治疗脊髓型颈椎病的中期疗效

目的:观察颈椎前路减压cage植骨融合术与颈椎前路减压自体髂骨块植骨融合钛板内固定术治疗脊髓型颈椎病的中期临床疗效。方法:2001年1月～2006年4月128例脊髓型颈椎病患者按照手术方式分为A、B两组,A组61例患者采用前路减压单纯PEEK cage植骨融合术治疗,其中病变节段与手术节段均为单节段22例,双节段39例;B组67例采用颈椎前路减压自体髂骨块植骨融合钛板内固定术,其中单节段27例,双节段40例。观察手术前后JOA评分、椎间高度和颈椎曲度情况。结果:A组手术时间为58.1±1.4min,术中出血量为42.4±2.0ml,B组分别为72.0±5.3min、82.7±3.9ml,两组比较差异有统计学意义(P<0.05)。A组23例(39.3%)出现一过性咽部不适,1例硬脊膜破裂,2例cage塌陷、移位;B组49例(73.1%)出现一过性咽部不适,1例硬脊膜破裂,5例髂骨供区痛,2例钉板松动。每组患者术后JOA评分、椎间高度和颈椎曲度均较术前明显改善(P<0.05),A、B组术后JOA评分改善率分别为(82.30±6.61)%和(83.80±4.42)%,组间比较差异无统计学意义(P>0.05)。随访24～60个月,平均36个月,末次随访时A、B组椎间融合率分别为95.2%和96.3%,两组比较差异无统计学意义(P>0.05);末次随访时每组JOA评分、椎间高度和颈椎曲度与术后比较差异无统计学意义(P>0.05)。术前、术后和末次随访时JOA评分、椎间高度和颈椎曲度两组比较差异无统计学意义(P>0.05)。结论:颈椎前路减压cage植骨融合术与颈椎前路减压自体髂骨块植骨融合钛板内固定术治疗脊髓型颈椎病的中期疗效均较好,但前者手术方法简单、近期并发症少。

椎弓根螺钉系统加cage融合器治疗腰椎滑脱症疗效分析

目的分析椎弓根螺钉系统加cage融合器治疗腰椎滑脱症的疗效。方法2003年2月～2006年3月,联合应用椎弓根螺钉系统加cage融合器治疗腰椎滑脱症患者37例。男21例,女16例;年龄39～69岁。滑脱部位:L33例,L423例,L511例。根据Meyerding滑脱程度分级标准,度滑脱12例,度滑脱20例,度滑脱5例。观察术前、术后2周及3个月随访时Taillard指数、Boxall指数、滑脱角、腰椎生理前凸角及椎间隙高度的变化情况。结果37例患者术后均获3～36个月随访。术前与术后2周Taillard指数、Boxall指数、腰椎生理前凸角、滑脱角及椎间隙高度比较,差异均有统计学意义(P<0.05);各指标术后3个月与术后2周比较,差异均无统计学意义(P>0.05)。根据邹德威评分标准,优27例,良8例,可2例,优良率达94.6%。患者术后3～8个月植骨均融合,平均3.9个月。内固定材料无松动、断裂,cage融合器位置、形态正常。结论联合应用椎弓根螺钉系统和cage融合器治疗腰椎滑脱症可起到协同作用,能提供理想复位和坚强内固定,提高脊柱的融合率,是治疗腰椎滑脱症的一种较理想方法。

后路椎体间自体髂骨融合与Cage融合治疗下腰椎不稳的比较研究

目的比较后路椎体间自体髂骨融合与Cage融合治疗成人下腰椎不稳的效果。方法2003年2月-2006年10月,收治60例下腰椎不稳患者。28例采用后路椎体间自体髂骨块融合治疗(植骨组):男17例,女11例;年龄(52.78±10.50)岁。病程3～16个月。退变性不稳12例,峡部裂性滑脱14例,医源性不稳2例。L3、41例,L4、517例,L5、S110例。相对椎间隙高度(23.24±6.62)mm,椎间隙活动度(10.50±5.07)°,矢状滑移距离(4.50±1.15)mm,JOA评分(18.56±2.68)分。32例采用Cage融合治疗(Cage组):男19例,女13例;年龄(51.75±10.44)岁。病程3.5～14.0个月。退变性不稳16例,峡部裂性滑脱14例,医源性不稳2例。其中L4、516例,L5、S116例。相对椎间隙高度(24.34±7.22)mm,椎间隙活动度(11.12±5.67)°,矢状滑移距离(4.38±0.75)mm,JOA评分(19.00±4.12)分。两组一般情况比较,差异均无统计学意义(P>0.05)。结果术后1、3、6、12个月两组患者获定期随访。两组手术时间及出血量差异无统计学意义(P>0.05);手术费用植骨组和Cage组分别为(2.0857±1.1451)万元和(3.3875±0.8706)万元,差异有统计学意义(P<0.01)。植骨组2例术后2周出现取骨区疼痛,未作处理;3例患者术后1～2d出现神经损伤症状,对症处理后症状消失。Cage组2例术后1～2d出现神经损伤症状,对症处理后症状消失。两组均无假关节形成、椎间隙感染及Cage移位。两组相对椎间隙高度手术前后比较差异均有统计学意义(P<0.01),且两组术后各时间点比较差异均有统计学意义(P<0.01)。术后1、3、6、12个月,植骨组椎体融合分别为0、0、7、23例;Cage组分别为0、0、8、29例;术后6、12个月两组融合率比较,差异无统计学意义(P>0.05)。术后各时间点两组JOA评分与术前比较,差异均有统计学意义(P<0.05);术后各时间点植骨组JOA评分与Cage组比较,差异均无统计学意义(P>0.05)。结论采用自体髂骨融合治疗下腰椎不稳在融合时间、融合率及临床症状缓解程度方面与Cage融合无显著差异。自体髂骨可作为下腰椎不稳椎间融合的植骨材料,临床疗效好,无免疫排斥,价格便宜。

cagE在胃肠疾病患者中的分布及其临床意义

目的 :研究 cag E在幽门螺杆菌 (H elicobacter pylori,Hp)感染的不同胃肠疾病患者中的分布及其与 Hp感染相关疾病的关系。 方法 :合成 cag EU 1- cag EU 2和 cag E3- cag E4两组引物 ,应用聚合酶链反应 (PCR)法扩增 14 5株临床分离培养的Hp菌株 cag E片段。 结果 :Hp临床菌株的 cag EU 1- cag EU 2 PCR产物总检出率为 75 .9%(110 / 14 5 ) ,慢性胃炎、十二指肠溃疡、胃溃疡、复合溃疡中检出率分别为 6 9.4 %、85 .4 %、76 .5 %、75 .0 %,溃疡组略高于胃炎组 ,但差异无显著性 (P>0 .0 5 )。cag E3- cag E4总检出率为 4 2 .1%(6 1/ 14 5 ) ,慢性胃炎、十二指肠溃疡、胃溃疡、复合溃疡中检出率分别为 38.9%,4 7.9%,35 .3%,5 0 %,差异无显著性 (P>0 .0 5 ) ;cag E总检出率为 79.3%(115 / 14 5 )。 结论 :cag E在不同的消化道疾病患者感染的Hp中均有较高的检出率 ,在不同疾病中的分布无特异性 ,cag

钛网联合Cage配合自锁钛板治疗多节段颈椎间盘突出症

目的总结钛网联合Cage配合自锁钛板在多节段颈椎间盘突出症前路椎间盘切除后椎体间融合的效果。方法回顾性分析2004年9月-2007年6月采用钛网联合Cage配合自锁钛板治疗18例多节段颈椎间盘突出症的临床效果。男11例,女7例;年龄32～75岁,平均54岁。病程6个月～15年,平均5.8年。肢体感觉障碍16例;四肢肌力2级3例,3级12例,4级1例,5级2例;锥体束征阳性16例;大小便障碍13例;性功能障碍8例;伴神经根型症状7例。其中连续的多节段12例,不连续的多节段6例。术前JOA评分为(8.30±1.21)分。X线片及MRI示不同程度椎间盘退变、突出、颈髓受压。术前X线片测得病变椎间隙高度为(6.40±0.87)mm。结果术后切口均Ⅰ期愈合。患者均获随访,随访时间6～36个月,平均18个月。术后早期四肢运动功能恢复较好,感觉障碍恢复较慢;术前肌张力高者术后肌张力下降;患者肢体灵活性改善。手术椎间隙于术后3～6个月获骨性融合,未见塌陷。术后6个月,JOA评分为(12.60±0.78)分,改善率51.8%,与术前比较差异有统计学意义(P<0.05);病变椎间隙高度为(8.20±0.46)mm,与术前比较差异有统计学意义(P<0.05)。按照Odom临床效果分级进行评价,优17例,良1例。无死亡,无脊髓、神经、气管及食道损伤等并发症发生,无Cage移位及松动发生。结论对于多节段颈椎间盘突出症,钛网联合Cage配合自锁钛板固定更具优势。