Techniques

技术
  • 文章类型: Journal Article
    葡萄霜霉病(GDM),由卵菌plasmoparaviticola引起的,在有利的条件下,会导致100%的产量损失和藤蔓死亡。高分辨率多光谱卫星平台提供了跟踪快速传播疾病的机会,如GDM,异构领域。这里,我们调查了PlanetScope(3m)和SkySat(50cm)图像的容量,以进行长季节的GDM检测和监视。一组训练有素的侦察员在日内瓦的一个研究葡萄园对GDM的严重程度和发生率进行了评估,NY,美国从2020年6月到8月,2021年和2022年。对侦察后72小时内获取的卫星图像进行处理,以提取单波段反射率和植被指数(VI)。在光谱带和来自两个图像数据集的VI上训练的随机森林模型可以对高和低GDM发病率和严重性的区域进行分类,最大精度为0.85(SkySat)和0.92(PlanetScope)。然而,直到7月下旬-8月上旬,我们才观察到高损伤等级和低损伤等级的VIs之间存在显著差异.我们确定了云层覆盖,图像配准,和低光谱分辨率是实施基于卫星的GDM监视的关键挑战。这项工作建立了星载多光谱传感器检测晚期GDM的能力,并概述了将卫星遥感纳入葡萄疾病监测系统的步骤。
    Grapevine downy mildew (GDM), caused by the oomycete Plasmopara viticola, can cause 100% yield loss and vine death under conducive conditions. High resolution multispectral satellite platforms offer the opportunity to track rapidly spreading diseases like GDM over large, heterogeneous fields. Here, we investigate the capacity of PlanetScope (3 m) and SkySat (50 cm) imagery for season-long GDM detection and surveillance. A team of trained scouts rated GDM severity and incidence at a research vineyard in Geneva, NY, USA from June to August of 2020, 2021, and 2022. Satellite imagery acquired within 72 hours of scouting was processed to extract single-band reflectance and vegetation indices (VIs). Random forest models trained on spectral bands and VIs from both image datasets could classify areas of high and low GDM incidence and severity with maximum accuracies of 0.85 (SkySat) and 0.92 (PlanetScope). However, we did not observe significant differences between VIs of high and low damage classes until late July-early August. We identified cloud cover, image co-registration, and low spectral resolution as key challenges to operationalizing satellite-based GDM surveillance. This work establishes the capacity of spaceborne multispectral sensors to detect late-stage GDM and outlines steps towards incorporating satellite remote sensing in grapevine disease surveillance systems.
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  • 文章类型: Journal Article
    由于种群成员之间的差异,大多数生物系统固有的变异性。在研究中通常观察到两种类型的变化:样本之间的差异和从样本估计总体参数(例如平均值)时的“误差”。虽然这些概念根本不同,相关的变化通常使用类似的符号表示-一个区间,表示具有下限和上限的值的范围。在本文中,我们将讨论如何使用常见的间隔(和误用)。
    Variability is inherent in most biological systems due to differences among members of the population. Two types of variation are commonly observed in studies: differences among samples and the \"error\" in estimating a population parameter (e.g. mean) from a sample. While these concepts are fundamentally very different, the associated variation is often expressed using similar notation-an interval that represents a range of values with a lower and upper bound. In this article we discuss how common intervals are used (and misused).
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  • 文章类型: Journal Article
    临床实践中迫切需要预防血清肿的新干预措施。动物模型是测试这些干预措施的关键工具;然而,在临床和动物模型结果之间仍然存在显著的翻译差距.本系统综述旨在评估用于血清瘤预防的动物模型的方法学特征和质量。进行荟萃分析以估计对照组的预期血清肿发生率,并确定典型干预措施的效果大小。我们系统地检索了所有描述诱导血清肿形成的动物模型的研究。方法论特征,偏见的风险,并对研究质量进行评估。血清瘤体积和发病率数据用于荟萃分析。总的来说,包括55项研究,42人符合荟萃分析的条件。大鼠(69%)是最常用的物种,在这些模型中,乳房切除术(50%)是主要的外科手术。尽管所有研究都存在很大的偏见风险,观察到报告质量每十年有改善的趋势.荟萃分析显示,典型对照组的平均血清瘤发生率为90%。平均干预措施使血清肿发生率减半(RR=0.49;CI0.35,0.70),血清肿体积显着减少(SMD=-3.31;CI-4.21,-2.41),尽管存在明显的异质性。总之,用于血清肿预防的动物模型表现出方法学缺陷和多种偏倚风险。实施足够有效的阳性和阴性对照组可以提高这些模型的内部有效性。需要更多的研究来进一步开发动物血清瘤模型。
    Novel interventions for seroma prevention are urgently needed in clinical practice. Animal models are pivotal tools for testing these interventions; however, a significant translational gap persists between clinical and animal model outcomes. This systematic review aims to assess the methodological characteristics and quality of animal models utilized for seroma prevention. A meta-analysis was performed to estimate the expected seroma incidence rate for control groups and determine the effect size of typical interventions. We systematically retrieved all studies describing animal models in which seroma formation was induced. Methodological characteristics, risks of bias, and study quality were assessed. Seroma volume and -incidence data were used for the meta-analysis. In total, 55 studies were included, with 42 eligible for meta-analysis. Rats (69%) were the most frequently used species, with mastectomy (50%) being the predominant surgical procedure in these models. Despite significant risks of bias across all studies, an improving trend in reporting quality per decade was observed. The meta-analysis revealed an average seroma incidence of 90% in typical control groups. The average intervention halved the seroma incidence (RR = 0.49; CI 0.35, 0.70) and significantly reduced seroma volume (SMD = -3.31; CI -4.21, -2.41), although notable heterogeneity was present. In conclusion, animal models for seroma prevention exhibit methodological flaws and multiple risks of bias. Implementing sufficiently powered positive and negative control groups could improve the internal validity of these models. More research is needed for further development of animal seroma models.
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  • 文章类型: Journal Article
    这项研究探讨了使用或不使用基于甲基丙烯酸酯的模型树脂的牙刷对树脂基复合材料的长期颜色稳定性和表面形貌的影响。本研究考察了两个变量的影响:(1)使用的画笔类型(艺术画笔,微刷,或Mylar条)和(2)建模树脂的应用(应用或不应用)。通过10,000次热循环循环对样品进行人工老化,然后浸入咖啡中30天。在基线和老化后测量颜色和表面粗糙度,使用非接触式轮廓仪的表面粗糙度和分光光度计的颜色。数据采用配对t检验和单因素方差分析。与其他组相比,用牙科刷或微刷光滑的树脂基复合材料的颜色变化(ΔE)较低。配对t检验显示,每种堆焊技术在老化前后的平均表面粗糙度(Ra)和谷深(Rv)均存在显着差异(p﹤0.01)。在控制和微刷组中,轮廓高度(Rq)的均方根平均值显着增加(p﹤0.01)。总之,在树脂基复合材料放置中使用刷子不会增加染色的敏感性。相反,包含树脂模型有助于随着时间的推移变色。
    This study explores the effect of using dental brushes with or without metacrylate-based modeling resins on long-term color stability and surface topographies of resin-based composites. This study examined the effects of two variables: (1) the type of brush used (Art brush, Micro-brush, or Mylar strip) and (2) the application of a modeling resin (applied or not applied). The specimens were artificially aged through 10,000 cycles of thermocycling and subsequently immersed in coffee for 30 days. Measurements of color and surface roughness were taken at baseline and after the aging, using a non-contact profilometer for surface roughness and a spectrophotometer for color. Data were analyzed using paired t-tests and one-way ANOVA. Resin-based composites smoothed with dental brushes or micro brushes without modeling resins exhibited lower color change (ΔE) than other groups. Paired t-tests revealed significant differences in average surface roughness (Ra) and valley depth (Rv) for each surfacing technique before and after aging (p ⩽ 0.01). The root means square average of the profile heights (Rq) significantly increased in the control and micro-brush groups (p ⩽ 0.01). In conclusion, the use of brushes in resin-based composites placement does not increase the susceptibility to staining. Instead, the inclusion of resin modeling contributes to discoloration over time.
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  • 文章类型: Journal Article
    胸腰椎骨折的手术治疗是创伤后这种损伤患者护理的迅速发展。本文介绍了不同的技术和原理。根据骨折类型的分类和严重程度,科学地阐述和说明了治疗的考虑因素和方法。使用计算机导航和优化微创技术是不可避免的。还讨论了手术时机以及骨折愈合后材料的去除。脊柱骨折的手术治疗正在兴起,还有更多的知识需要获得。
    The operative treatment of thoracolumbar fractures is a rapidly evolving improvement in the care of patients with this injury after trauma. This article describes the different techniques and principles. Considerations and methods of treatment are scientifically addressed and illustrated according to the classification and severity of the fracture pattern. The use of computer navigation and optimisation of minimally invasive techniques is inevitable. The timing of surgery as well the removal of the material after fracture healing are also discussed. The operative treatment of spinal fractures is emerging and there is still much more knowledge to gain.
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  • 文章类型: Journal Article
    在涉及小鼠等小型啮齿动物的研究中,尿液收集可能具有挑战性,因为实际的收集方法是焦虑的,并且限制了动物的福利,同时收集的尿液体积具有很大的变异性。为了改进目前的方法,最终减少对小鼠健康的影响,我们开发了一种创新的3D打印尿液收集设备(UCD)。这种两室UCD的形状适合于经典的饲养笼中,并允许通过自发排尿从两只装在自己笼子中的小鼠中收集尿液,而不会交叉污染,同时实现潜在的社交互动。我们使用UCD研究抗体介导的慢性肾脏疾病模型中与肾功能相关的尿参数的演变。总的来说,我们在这里报告了一种节省时间和负担得起的方法,用于收集大量未污染的尿液,我们认为与其他方法相比,这种方法可以改善动物的福利。
    Urine collection can be challenging in studies involving small rodents like mice, as the actual methods of collection are anxiogenic and constrain animal welfare while having high variability in the volume of urine collected. To improve the current methods and eventually reduce the impact on the well-being of mice, we developed an innovative 3D-printed urine collection device (UCD). This two-compartment UCD is shaped to fit in classical husbandry cages and allows urine collection by spontaneous urination from two mice housed in their own cage without cross-contamination while enabling potential social interactions. We used our UCD to study the evolution of urinary parameters related to renal functions in a model of antibody-mediated chronic kidney disease. Overall, we report here a time-saving and affordable method for urine collection providing a large amount of uncontaminated urine and which we believe may improve animal welfare in comparison with other methods.
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  • 文章类型: Journal Article
    结直肠癌是男性中第三大最常见的癌症,在女性中排名第二。仅在美国,每年有15万例确诊病例。结肠镜检查仍然是最好的鉴别方法,评估,并对癌前病变患者进行干预。多种指南和技术可用于协助内窥镜医师准确诊断这些病变。其中包括巴黎,窄带成像(NBI)国际结直肠内镜(NICE),日本NBI专家团队(JNET)Kudo,广岛,和Shudo分类利用诸如色素内窥镜检查之类的技术,窄带成像,和细胞内镜检查以评估凹坑模式和表面形态。利用这些工具可以帮助内窥镜医师预测结肠病变的细胞学,并选择最合适的切除方法,同时最大程度地保留器官。
    Colorectal cancer is the third most common cancer among men and the second among women. In the United States alone, there are 150,000 cases diagnosed each year. Colonoscopy remains the best method for identifying, evaluating, and intervening on patients with precancerous lesions. Multiple guidelines and techniques are available to assist the endoscopist with accurate diagnosis of these lesions. These include the Paris, Narrow-Band Imaging (NBI) International Colorectal Endoscopic (NICE), Japan NBI Expert Team (JNET), Kudo, Hiroshima, and Shudo classifications which utilize techniques such as chromoendoscopy, narrow-band imaging, and endocytoscopy to evaluate pit pattern and surface morphology. Utilization of these tools can help the endoscopist predict the cytology of a colonic lesion and select the most appropriate method for resection while maximizing organ preservation.
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  • 文章类型: Journal Article
    各种各样的疫霉种类,包括许多重要的植物病原体,在地表水灌溉水源中被广泛发现。在过去的十年里,元编码已用于表征水性疫霉种群。代谢编码通常涉及从疫霉物种中扩增核核糖体内部转录间隔区(ITS)1或ITS2的部分,其次是索引高通量测序。然而,整个ITS区域的全长序列是许多疫霉物种的分辨率所必需的。我们使用PacBio对全长ITS扩增子进行测序,以分析加利福尼亚州圣华金河谷北部斯托克顿东水区(SEWD)水道中的疫霉种群。这种方法产生了疫霉群落许多成员的物种级分辨率。将结果与仅使用ITS1或ITS2区域获得的结果进行比较,发现它们为P.pini提供了更好的物种分辨率,P.Capsici,还有P.Gregata.在整个2021年的灌溉季节,从整个SEWD的五个水道中收集了样品。在水道中检测到38种疫霉菌,包括树木作物病原体。P.cactorum,P.Pini,P.×cambivora,P.Niederhauserii,P.mediterranea,和P.优生核桃。在整个灌溉季节的大部分时间里,在整个SEWD中都检测到了这些致病物种。结果表明,全长ITS扩增子测序可用于鉴定环境样品中的疫霉物种,并表明用SEWD水灌溉的果园可能会带来一些疾病风险。需要额外的流行病学研究来严格评估这种风险。
    Diverse Phytophthora species, including many important plant pathogens, have been widely detected among surface water irrigation sources. In the past decade, metabarcoding has been used to characterize waterborne Phytophthora populations. Metabarcoding typically involves amplification of portions of the nuclear ribosomal internal transcribed spacer (ITS)1 or ITS2 from Phytophthora species, followed by indexed high throughput sequencing. However, full-length sequences of the entire ITS region are required for resolution of many Phytophthora species. We used metabarcoding with PacBio sequencing of full-length ITS amplicons to analyze populations of Phytophthora in waterways of the Stockton East Water District (SEWD) in the northern San Joaquin Valley of California. This approach yielded species-level resolution of many members of the Phytophthora community. Results were compared to those obtained by using ITS1 or ITS2 regions alone and were found to provide superior species resolution for P. pini, P. capsici, and P. gregata. Samples were collected throughout the 2021 irrigation season from five waterways across the SEWD. Thirty-eight Phytophthora species were detected in the waterways, including tree-crop pathogens P. acerina, P. cactorum, P. pini, P. ×cambivora, P. niederhauserii, P. mediterranea, and P. taxon walnut. These pathogenic species were detected throughout the SEWD during most of the irrigation season. The results demonstrated the utility of full-length ITS amplicon sequencing for identifying Phytophthora species in environmental samples and suggested that some disease risk may be incurred by orchardists irrigating with SEWD water. Additional epidemiological studies will be required to critically evaluate this risk.
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  • 文章类型: Journal Article
    在交配/授精后不久检测妊娠和确定胎龄的新技术对于加快生殖周期和确保畜牧业的高生殖效率至关重要。超声检查可以成功地识别怀孕并确定许多家畜的胎龄。另一方面,许多成群的骆驼、水牛和成群的绵羊都知道服务的日子,使得适当管理怀孕的动物变得困难。这项研究提供了有关超声诊断骆驼妊娠的各种技术的文献综述,水牛,羊,专注于使用每种技术的最合适时间,最早诊断怀孕的机会,以及使用胎儿的各个部分创建数学方程式来确定胎龄的可能性。确定了超声检查在妊娠诊断中的一些局限性,并讨论了单峰性妊娠的重要妊娠事件,包括左角妊娠和双胎妊娠.这里提供的数据将证明对研究人员至关重要,农民,以及严重依赖这些动物提供肉类的国家,牛奶,化妆品,和其他动物产品,以提高繁殖和生产效率。
    New technologies for detecting pregnancy shortly after mating/insemination and identifying gestational age are essential for speeding up the reproductive cycle and ensuring high reproductive efficiency in livestock farming. Ultrasonography can successfully identify pregnancy and determine gestational age in many domestic animals. On the other hand, many herds of camel and buffalo and flocks of sheep are aware of the day of service, making it difficult to appropriately manage pregnant animals. This study provides a review of the literature on various techniques for ultrasonographically diagnosing pregnancy in camels, buffaloes, and sheep, focusing on the most appropriate times to use each technique, the earliest opportunity to diagnose pregnancy, and the possibility of using various parts of the fetus to create mathematical equations to determine gestational age. Some limitations of ultrasonography in pregnancy diagnosis were identified and significant pregnancy events in dromedaries were discussed, including left-horn and twin pregnancies. The data presented here will prove essential for researchers, farmers, and countries that rely heavily on these animals for providing meat, milk, cosmetics, and other animal products to enhance reproduction and production efficiency.
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  • 文章类型: Journal Article
    再生医学领域越来越需要用于组织工程的有效和生物相容性材料。人脱细胞真皮基质(hADM)衍生的胶原蛋白基质是特别有前途的候选物。它们保持结构完整性的能力,再加上卓越的生物相容性,将它们定位为组织替代的可行选择。然而,它们的临床应用主要限于用作支架。本研究旨在通过探索不同的尖端临床需求来扩大胶原蛋白片的临床应用范围。这篇综述说明了胶原蛋白片的临床应用,超越了传统的作用,如覆盖皮肤缺损或单独充当支架。特别是,Epiflex®的潜力,一种商业上可获得的和临床上立即可用的同种异体膜,将被评估。胶原蛋白片已证明在骨重建中的功效,他们可以在单阶段程序中替代诱导的Masquelet膜,证明是临床有效和安全的。这些膜的应用可以重建大量的组织缺损,不需要大量的整形手术。此外,他们被发现是适合解决骨软骨炎的病变和韧带重建的。本研究中展示的令人信服的临床实例证实,人类ADM的应用大大超出了其最初用于皮肤缺损治疗的范围。hADM已被证明是非常成功和耐受性良好的管理各种病因的骨和软组织缺损,提高患者护理效果。特别是,从货架上的应用减少了额外的手术或供体部位缺陷的需要。
    The field of regenerative medicine is increasingly in need of effective and biocompatible materials for tissue engineering. Human acellular dermal matrix (hADM)-derived collagen matrices stand out as a particularly promising candidate. Their ability to preserve structural integrity, coupled with exceptional biocompatibility, positions them as a viable choice for tissue replacement. However, their clinical application has been largely confined to serving as scaffolds. This study aims to expand the horizon of clinical uses for collagen sheets by exploring the diverse cutting-edge clinical demands. This review illustrates the clinical utilizations of collagen sheets beyond traditional roles, such as covering skin defects or acting solely as scaffolds. In particular, the potential of Epiflex®, a commercially available and immediately clinically usable allogeneic membrane, will be evaluated. Collagen sheets have demonstrated efficacy in bone reconstruction, where they can substitute the induced Masquelet membrane in a single-stage procedure, proving to be clinically effective and safe. The application of these membranes allow the reconstruction of substantial tissue defects, without requiring extensive plastic reconstructive surgery. Additionally, they are found to be apt for addressing osteochondritis dissecans lesions and for ligament reconstruction in the carpus. The compelling clinical examples showcased in this study affirm that the applications of human ADM extend significantly beyond its initial use for skin defect treatments. hADM has proven to be highly successful and well-tolerated in managing various etiologies of bone and soft tissue defects, enhancing patient care outcomes. In particular, the application from the shelf reduces the need for additional surgery or donor site defects.
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