Reducing intimal hyperplasia in vein grafts harvested by a no-touch harvesting technique

Objective To investigate the effect of no-touch harvesting technique in reducing vein graft intimal hyperplasia. Methods This longitudinal trial compared graft angiostenosis of two groups undergoing jugular vein to carotid artery interposition grafting in rabbit model. Conventional group:12 rabbits had their veins stripped,distended,and stored in heparinized saline solution. No-touch group:12 rabbits had veins removed with surrounding tissues,but were not distended,and stored in heparinized blood. The grafts were removed 4 weeks following grafting,and morphometry and immunohistochemistry assessment were performed. Results The intimal thickness,degree of angiostenosis and proliferation index of vascular smooth muscle cells of no-touch group were significantly reduced (P<0.01) compared with those of the conventional group. The proliferating cell nuclear antigen positive-staining cells were significantly increased (P<0.01) in the conventional group compared with whose in the no-touch group. Conclusion Harvesting the vein graft with no-touch harvesting technique could significantly reduce intimal hyperplasia of the vein graft.

No-touch isolation technique in emergency pancreaticoduodenectomy for neoplastic hemorrhage: Two case reports and review of literature

BACKGROUND Emergency pancreaticoduodenectomy(EPD)is a rare event for complex periam-pullary etiology.Increased intraoperative blood loss is correlated with poor post-operative outcomes.CASE SUMMARY Two patients underwent EPD using a no-touch isolation technique,in which all arteries supplying the pancreatic head region were ligated and divided before manipulation of the pancreatic head and duodenum.The operative times were 220 and 239 min,and the blood loss was 70 and 270 g,respectively.The patients were discharged on the 14^(th) and 10^(th) postoperative day,respectively.Thirty-two patients underwent EPD for the treatment of neoplastic bleeding.The mean operative time was 361.6 min,and the mean blood loss was 747.3 g.The comp-lication rate was 37.5%.The in-hospital mortality rate was 9.38%.CONCLUSION The no-touch isolation technique is feasible,safe,and effective for reducing intraoperative blood loss in EPD.

The “No-touch” technique improves the survival of patients with advanced hepatocellular carcinomas treated by liver transplantation: A single-center prospective randomized controlled trial

Background:Liver transplantation(LT)is the best treatment for patients with hepatocellular carcinoma(HCC).However,the surgical technique needs to be improved.The present study aimed to evaluate the“no-touch”technique in LT.Methods:From January 2018 to December 2019,we performed a prospective randomized controlled trial on HCC patients who underwent LT.The patients were randomized into two groups:a no-touch technique LT group(NT group,n=38)and a conventional LT technique group(CT group,n=46).Operative outcomes and survival in the two groups were analyzed.Results:The perioperative parameters were comparable between the two groups(P>0.05).There was no significant difference between the two groups in disease-free survival(DFS)(P=0.732)or overall survival(OS)(P=0.891).Of 36 patients who were beyond the Hangzhou criteria for LT,the DFS of the patients in the NT group was significantly longer than that in the CT group(median 402 vs.126 days,P=0.025).In 31 patients who had portal vein tumor thrombosis(PVTT),DFS and OS in the NT group were significantly better than those in the CT group(median DFS 420 vs.167 days,P=0.022;2-year OS rate 93.8%vs.66.7%,P=0.043).In 14 patients who had diffuse-type HCCs,DFS and OS were significantly better in the NT group than those in the CT group(median DFS 141 vs.56 days,P=0.008;2-year OS rate 75.0%vs.33.3%,P=0.034).Multivariate analysis showed that for patients with PVTT and diffusetype HCCs,the no-touch technique was an independent favorable factor for OS(PVTT:HR=0.018,95%CI:0.001-0.408,P=0.012;diffuse-type HCCs:HR=0.034,95%CI:0.002-0.634,P=0.024).Conclusions:The no-touch technique improved the survival of patients with advanced HCC compared with the conventional technique.The no-touch technique may provide a new and effective LT technique for advanced HCCs.

Different techniques for harvesting grafts for living donor liver transplantation: A systematic review and meta-analysis

AIM To perform a systematic review and meta-analysis on minimally vs conventional invasive techniques for harvesting grafts for living donor liver transplantation. METHODS PubMed, Web of Science, EMBASE, and the Cochrane Library were searched comprehensively for studies comparing MILDH with conventional living donor hepatectomy (CLDH). Intraoperative and postoperative outcomes (operative time, estimated blood loss, postoperative liver function, length of hospital stay, analgesia use, complications, and survival rate) were analyzed in donors and recipients. Articles were included if they: (1) compared the outcomes of MILDH and CLDH; and (2) reported at least some of the above outcomes. RESULTS Of 937 articles identified, 13, containing 1592 patients, met our inclusion criteria and were included in the meta-analysis. For donors, operative time [weighted mean difference (WMD) = 20.68, 95% CI: -6.25-47.60, p = 0.13] and blood loss (WMD = -32.61, 95% CI: -80.44-5.21, p = 0.18) were comparable in the two groups. In contrast, analgesia use (WMD = -7.79, 95% CI: -14.06-1.87, p = 0.01), postoperative complications [odds ratio (OR) = 0.62, 95% CI: 0.44-0.89, p = 0.009], and length of hospital stay (WMD): -1.25, 95% CI: -2.35-0.14, p = 0.03) significantly favored MILDH. No differences were observed in recipient outcomes, including postoperative complications (OR = 0.93, 95% CI: 0.66-1.31, p = 0.68) and survival rate (hr = 0.96, 95% CI: 0.27-3.47, p = 0.95). Funnel plot and statistical methods showed a low probability of publication bias. CONCLUSION MILDH is safe, effective, and feasible for living donor liver resection with fewer donor postoperative complications, reduced length of hospital stay and analgesia requirement than CLDH.

The effect of endoscopic vein harvesting in coronary artery bypass surgery:association between vein harvesting techniques and quality of conduits,wound complications,and cardiovascular events

Objective The study aimed to compare quality of saphenous vein(SV)grafts,wound complications,and clinical outcomes between endoscopic vein harvesting(EVH)technique and open vein harvesting(OVH)technique of coronary artery bypass graft(CABG)surgery.Methods One hundred patients with multi-vessel coronary disease underwent elective CABG using SV grafts were prospectively recruited and randomized into two groups.

Scavenging Microwave Wireless Power:A Unified Model,Rectenna Design Automation,and Cutting-Edge Techniques

While sufficient review articles exist on inductive short-range wireless power transfer(WPT),long-haul microwave WPT(MWPT)for solar power satellites,and ambient microwave wireless energy harvesting(MWEH)in urban areas,few studies focus on the fundamental modeling and related design automation of receiver systems.This article reviews the development of MWPT and MWEH receivers,with a focus on rectenna design automation.A novel rectifier model capable of accurately modeling the rectification process under both high and low input power is presented.The model reveals the theoretical boundary of radio frequency-to-direct current(dc)power conversion efficiency and,most importantly,enables an automated system design.The automated rectenna design flow is sequential,with the minimal engagement of iterative optimization.It covers the design automation of every module(i.e.,rectifiers,matching circuits,antennae,and dc–dc converters).Scaling-up of the technique to large rectenna arrays is also possible,where the challenges in array partitioning and power combining are briefly discussed.In addition,several cutting-edge rectenna techniques for MWPT and MWEH are reviewed,including the dynamic range extension technique,the harmonics-based retro-directive technique,and the simultaneous wireless information and power transfer technique,which can be good complements to the presented automated design methodology.

Solar Energy Harvesting Using a Timer-Based Relay Selection

In this paper,the throughput and delay of cooperative communications are derived when solar energy is used and relay node is selected using a timer.The source and relays harvest energy from sun using a photo voltaic system.The harvested power is used by the source to transmit data to the relays.Then,a selected relay amplifies the signal to the destination.Opportunistic,partial and reactive relay selection are used.The relay transmits when its timer elapses.The timer is set to a value proportional to the inverse of its Signal to Noise Ratio(SNR).Therefore,the relay with largest SNR will transmit first and its signal will be detected by the other relays that will remain idle to avoid collisions.Harvesting duration is optimized to maximize the throughput.Packet’s waiting time and total delay are also computed.We also derive the statistics of SNR when solar energy is used.The harvested power from sun is proportional to the sum of a deterministic radiation intensity and a random attenuation due to weather effects and clouds occlusion.The fixed radiation intensity depends on season,month and time t in hour.The throughput of cooperative communications with energy harvesting from sun was not yet studied.

AN ECOLOGICAL APPROACH TO FOREST HARVESTING

This paper deals with the relationships between forest harvesting and forest ccology.Itproposes basing annual cuts and forest operation plans on ecological principles.Harvestable forest re-sources are decreasing and regeneration is slow.The combination of forest harvesting with ccologycan be viewed as a solution to the forest harvesting dilemma in China.This paper also makes sometechnical recommendations for forest operations based on ecological principles.

Water harvesting experiences from the southern and eastern Africa rainwater network

This paper shares experiences of the southern and eastern Africa rainwater network on rainwater harvesting.It also shares the lessons drawn from policy research awareness creation and networking building of national networks and assessment of promising water harvesting techniques in the Sub-Saharan Africa.The concerted promotional effort of the southern and eastern Africa rainwater network has resulted in the general acceptance of rainwater harvesting as a viable option for boosting domestic water supply agricultural production and environmental sustainability.To date twelve nationally registered rainwater harvesting associations have been established which are providing leadership and capacity building in rainwater harvesting.Governments and donors are also aligning their policies towards providing increased financial institutional and technical support for upscaling rainwater-harvesting techniques. This paper concludes that diligent land and water management is necessary for yielding the highest benefits from rainwater.In addition to enabling policies and institutions there must be ample budgetary support to increase adoption of the technology.

Mountain Wood vs. Lowland Wood Harvesting Methods： An Ecological Case Study

Are Austrian mountain wood harvesting techniques more ecological than techniques applied in the lowlands of southern Germany？ For this comparative study, the authors selected the area of Lower Bavaria for lowland wood, as a great deal of wood is imported from this region to western Austria. At first, the felling area is described for both regions, from forest site to sawmill. Thereby, the authors create mean values related to timber harvesting and transportation, which are applicable to the whole of western Austria and Lower Bavaria, southern Germany. Secondly, the eco-balance of mountain and lowland wood is established. It is based on the following impact categories： global warming potential, acidification potential, eutrophication potential, ozone depletion potential and non-renewable primary energy. The environmental impact is more expressive if the results are applied to a specific construction part （i.e., glued laminated timber-ceiling）. Our research study showed the eco-balance of western Austrian mountain wood is more favourable than the environmental impact of harvesting lowland wood in southern Germany.

高产高抗宜机收玉米新品种陇单639的选育及栽培

培育高产、稳产籽粒直收玉米品种是玉米产业机械化发展的基本保障。为解决甘肃近年来玉米产业发展中存在的农业劳动力紧缺、玉米生产机械化程度低、宜机械收获籽粒品种缺少等问题,甘肃省农业科学院作物研究所玉米遗传育种团队通过种质资源改良、双单倍体诱导加倍、多环境胁迫选育、多生态区联合鉴定等技术,以自育自交系Z39-1为母本、DH系DHZ62-53为父本选育出了高产高抗宜机收玉米新品种陇单639。在2020-2021年进行的甘肃省玉米机收组区域试验中,陇单6392a10点(次)收获时籽粒平均水分含量为237.5g/kg,平均破损率为4.0%,平均折合产量为16095.0kg/hm^(2),较对照品种先玉335增产5.9%。在2022年进行的甘肃省玉米机收组生产试验中,5试点平均籽粒水分含量为209.0g/kg,籽粒破损率为4.0%,平均折合产量为15012.0kg/hm^(2),较对照品种先玉335增产6.4%。陇单639生育期平均为140d,株型半紧凑,株高290cm,筒型果穗,半马齿型籽粒,穗长19.6cm,穗行数16行,穗轴红色,籽粒黄色,千粒重419g左右。高抗禾谷镰孢茎腐病,中抗丝黑穗病、大斑病,感禾谷镰孢穗腐病。陇单639籽粒含粗蛋白为87.10g/kg、粗脂肪为369.0g/kg、粗淀粉为766.70g/kg、赖氨酸为2.97g/kg,容重为728g/L。同时该品种表现出高产、稳产、抗倒伏、脱水快等特点,在成熟后田间可站秆20d以上,具备机械收获籽粒品种的主要特征。适宜在甘肃省中晚熟春玉米类型区机收种植。

酸枣仁产业现状和发展建议

失眠是一种由多种因素导致的常见睡眠障碍性疾病,极大地影响人们的身心健康。酸枣仁是常用的具有养心安神、改善睡眠功效的药食同源中药,是治疗失眠类中成药及保健品的必备药味。然而,野生资源锐减、种植技术落后、基于品质的品种选育滞后等问题限制了酸枣仁产业的发展。概述酸枣的分布、产区、采收加工和质量现状,介绍酸枣的栽培技术和国内种植情况,提出保护种质资源、发展枣树嫁接酸枣、加强野生种质品质评价和高品质新品种选育、研发推广干法脱枣肉加工方法等产业发展建议,以期为酸枣仁产业发展提供参考。

No-touch与EVH获取大隐静脉桥血管的近中期临床结果分析

目的比较no-touch和内窥镜获取(endoscopic vein harvesting,EVH)两种不同的大隐静脉移植物获取方式对冠状动脉旁路移植术(coronary artery bypass grafting,CABG)术后早期临床效果及近中期移植物通畅率的影响。方法回顾性分析西安交通大学第一附属医院心血管外科2018年7月至2019年12月行CABG患者151例,其中no-touch技术组获取大隐静脉56例;EVH组获取大隐静脉95例。所有患者采取胸骨正中切口入路,非体外或体外循环辅助下完成搭桥手术。统计两组间平均桥血管远端吻合口数量、左乳内动脉吻合口数量及静脉桥远端吻合数量的差异;分析比较两组术后死亡及早期并发症发生情况以及术后切口并发症如血肿、脂肪液化等差异。患者出院前及术后1年行冠脉动脉CT血管成像检查(CTA)以评估移植血管桥近中期的通畅情况。结果Notouch和EVH两组在年龄、性别构成、危险因素、术前诊断类型等方面均无统计学差异。术中两组左乳内动脉吻合口数量及静脉桥远端吻合数量等差异均无统计学意义。两组均无手术死亡。在术后早期并发症方面无显著性差异;但在下肢切口并发症中水肿、切口处麻木、疼痛在no-touch组中尤为显著(P<0.05)。术后冠脉CTA复查提示,术后早期桥血管总体通畅率、两组间左乳内动脉及大隐静脉桥血管通畅率均无差异。术后1年总体桥血管通畅率no-touch组要优于EVH组(P<0.05),其中左乳内动脉通畅率无差异,大隐静脉桥血管no-touch组通畅率要明显高于EVH组(P<0.05)。结论No-touch技术获取静脉桥血管对于CABG患者的近、中期临床效果满意,且中期桥血管通畅率要优于EVH组。该技术可行、安全、有效,值得在CABG中进一步推广。

天山北坡前山带蒙古沙棘不同集水造林技术的效果评价

【目的】探讨天山北坡前山带蒙古沙棘(Hippophae rhamnoides subsp.mongolica)不同集水造林技术对土壤含水率、造林成活率和保存率及株高的影响,结合造林成本进行效果评价,筛选出最佳的蒙古沙棘造林技术,为该地区的人工造林提供技术参考。【方法】以蒙古沙棘优良品种‘新棘1号’(H.rhamnoides‘xinji1’)为研究对象,通过双因素试验设计,设4个水平沟深度:H0(0 cm)、H1(20 cm)、H2(40 cm)、H3(60 cm)和4个保水措施:W0(裸地)、W1(膨润土)、W2(防草布)、W3(膨润土+防草布)。【结果】水平沟深度、保水措施及二者的交互作用均对土壤含水率、造林成活率和保存率及株高有显著影响;在同一保水措施下,随着水平沟深度增加,各指标越优,但造林成本随之增加;在同一水平沟深度下,整体以W3处理最佳,但造林成本也最高;结合造林成本,通过隶属函数评价法综合评价各集水造林技术的效果,H2W3处理得分最高,H0W0得分最低。【结论】本研究筛选出最佳的蒙古沙棘的造林技术为H2W3(40 cm深度+膨润土+覆防草布)处理。

xScraper:基于Web-Harvest技术批量与深度获取无结构化Web信息

通过分析Web-Harvest数据提取规则的设计原理,设计实现了一个xScraper系统。该系统的主要功能有:(1)定制设计满足不同需求的Web数据提取规则模板,驱动Web-Harvest内核进行无结构化信息提取;(2)批量可控提取同一网址中的Web信息(含图像);(3)跨网站深度提取主题相关信息;(4)提取Web信息元数据并将其转换为XML标签;(5)实现无结构化多媒体信息的数据库管理。应用结果表明,系统提供了超出Web-Harvest的加值功能,可满足不同的信息提取需求,其简单实用,便于扩展。

口腔自体骨取骨术式对比分析

在种植修复中,为了将种植体植入在理想位置通常采用骨增量手术的方式解决牙槽骨骨量不足的问题。因自体骨具有骨引导性和骨诱导性,具有增强骨增量手术临床成骨效果的作用,所以其地位仍是骨替代材料无法取代的。目前获取自体骨材料的方式繁多,包括手用器械取骨、环钻取骨术和超声骨刀取骨术等。激光技术及低速钻等术式的兴起也为临床医生提供了更多选择。本文对“取骨术式”、“骨移植”等关键词进行检索,筛选相关文献,对各类取骨术式特点进行总结,并从各类术式的临床应用及对成骨能力的影响等多方面进行综合评价,以期为临床工作中选择取骨方式提供参考。

国内外薰衣草收获技术发展现状及展望

文章采用文献综述法,在调研国内外大量相关文献的基础上,介绍了国内外薰衣草收获技术的发展现状和研究热点,分析我国薰衣草机械化收获存在的问题,提出加强薰衣草收获机械的研发与合作,促进农机与农艺相融合、基础研究与设备研制相结合等发展措施,对加快我国薰衣草机械化收获进程具有一定的借鉴和促进作用。

香樟栽培技术研究进展

香樟作为优良用材和香料树种,其精油及相关化学成分应用广泛,具有较高的经济及研究价值。系统科学的栽培技术有利于保障香樟的健康生长,提高林分产量,从而提供更高的经济效益。本文总结了香樟可生长及最佳生长区域、施肥比例、最佳施肥龄期以及最佳采收时期等栽培技术,为香樟的科学栽培提供参考。

小麦联合收割机使用要点及维修保养技术

在小麦生产中,收获作业是关键环节,影响着小麦的产量以及品质。小麦联合收割机是农民在小麦收获季节的首选作业机械,其作业性能和作业质量对于小麦收获具有重要的影响。本文阐述了小麦联合收割机的使用要点及故障维修保养技术,旨在提升小麦机械化收获效率,保证小麦收割机性能的稳定性和作业质量的稳定性。

玉米机械化收获减损技术发展现状与建议

现代农机装备在玉米生产中的推广和应用,切实提高了玉米生产的整体效率,将农民从繁重的农业劳作中解脱出来,以此转变传统生产方式,实现农业产业结构的有效调整。以玉米机械化收获常见模式为基础,分析了玉米机械化收获的优势,探讨了玉米机收减损技术的发展现状,从提高农机驾驶人员的专业技术水平、加强农机农艺高效融合、明确机械化收获机具的选择和作业技术标准等几方面提出了相应的发展建议,尽量降低玉米机械化收获作业所造成的严重损失,提高机械化收获水平和收获效率。