adaptability

适应性
  • 文章类型: Journal Article
    随着纳米技术产业的发展,纳米TiO2不可避免地释放到水生环境中。研究指出,不同的个性在面对环境胁迫时表现出不同的行为和生理反应。然而,纳米TiO2对不同个性双壳类动物耐受性的影响尚不清楚。在研究中,通过压力后恢复方法,将文胸分为两种类型的个性-主动和反应性。事实证明,积极主动的人有更快的外壳打开水平,更强的挖洞行为,更快的饲料恢复,暴露于空气后,比反应性个体更高的标准代谢率和更快的氨排泄能力。然后,存活率,纳米TiO2暴露后,评估了分类蛤仔的血细胞反应和氧化酶活性。结果表明,暴露30d后,积极主动的个体加速了挖洞行为,存活率更高。此外,主动蛤仔比反应蛤仔有更好的适应性,血细胞反应和氧化损伤更少。该研究强调了海壳鱼的个性决定了个体适应环境变化的能力,在水产养殖和沿海生态系统健康中发挥重要作用。
    Nano-TiO2 is inevitably released into aquatic environment with increasing of nanotechnology industries. Study pointed that different individuality showed divergent behavioral and physiological response when facing environmental stress. However, the effects of nano-TiO2 on tolerance of bivalves with different individualities remain unknown. In the study, clams were divided into two types of individuality - proactive and reactive by post-stress recovery method. It turned out that proactive individuals had quicker shell opening level, stronger burrowing behavior, faster feeding recovery, higher standard metabolic rate and more rapid ammonia excretion ability than reactive individuals after exposed to air. Then, the survival rate, hemocytes response and oxidase activity of classified clams were evaluated after nano-TiO2 exposure. Results showed that after 30 d exposure, proactive individuals accelerated burrowing behavior with higher survival rate. Moreover, proactive clams had better adaptability and less hemocytes response and oxidative damage than reactive clams. The study highlights the individualities of marine shell fish determine individual capacity to adapt to environmental changes, play important roles in aquaculture and coastal ecosystem health.
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  • 文章类型: Journal Article
    本研究旨在使用体外模型评估植物乳杆菌PMO08在人胃肠道中的生存能力及其在结肠中的适应性。暴露于胃和小肠疾病后,大部分(92.70±1.14%)的PMO08被发现损坏,通过共聚焦显微镜和流式细胞术确定。在体外结肠发酵过程中,PMO08不仅在24小时时与对照样品(0.00±0.00%)相比增加了高达0.47±0.04%的丰度,而且还促进了有益或共生细菌的生长,从而增加了α-多样性指数。此外,PM008显著提高了短链脂肪酸(SCFA)和各种有机酸的水平。我们的结果表明,PM008在胃肠道条件下具有中等活力,但在结肠中表现出优异的益生菌活性。
    This study aimed to evaluate the survivability of Lactiplantibacillus plantarum PMO08 in the human gastrointestinal tract and its adaptability in the colon using in vitro models. After exposure to gastric and small intestinal conditions, the majority (92.70 ± 1.14%) of PMO08 was found to be damaged, as determined by confocal microscopy and flow cytometry. During in vitro colonic fermentation, PMO08 not only increased abundance up to 0.47 ± 0.04% compared with the control sample (0.00 ± 0.00%) at 24 h but also facilitated the growth of beneficial or commensal bacteria, thereby increasing the α-diversity indices. Additionally, PMO08 significantly elevated the levels of short-chain fatty acids (SCFAs) and various organic acids. Our results demonstrate that PMO08 possesses moderate viability under gastrointestinal conditions but exhibits superior probiotic activity in the colon.
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  • 文章类型: Journal Article
    背景:患者驱动的医疗保健创新是一种新兴现象,对慢性病患者有益,例如囊性纤维化(CF)。然而,以前的研究还没有从提供者的角度研究什么可能促进或阻碍这些创新的实施。
    目的:本研究的目的是解释CF诊所采用患者驱动创新的差异。
    方法:对采用患者控制的应用程序进行了多案例比较研究,以支持与医疗保健专业人员(HCP)的自我管理和合作。数据收集和分析以不采用为指导,放弃,传播,扩大规模,以及可持续性和复杂性评估工具(NASSS-CAT)框架。数据包括患者的用户活动水平和对9家诊所工作人员的定性访谈(n=8,88.9%,在瑞典;n=1,11.1%,在美国)。我们计算了每个诊所活跃用户的最大和平均百分比,并进行了统计过程控制(SPC)分析,以探索用户活动水平如何随时间变化。对定性数据进行内容分析和复杂性分析,并用于生成流程图。然后在交叉案例分析中对所有数据进行三角测量。
    结果:我们没有发现未采用或明确放弃该应用程序的证据。根据每个诊所的最大最终用户活动,可以识别不同的创新采用模式。我们标记为低(16%-23%),中等(25%-47%),或高采用率(58%-95%)。SPC图表表明,引入新的应用程序功能和与研究相关的活动对用户活动水平产生了积极影响。采用率的变化与提供者对护理过程复杂性的看法有关。价值主张的更高感知复杂性,采用者系统,和组织与较低的采用率有关。在早期采用创新的诊所或依赖冠军的诊所,用户活动趋于平稳或下降,表明对可持续性的负面影响。
    结论:为了在医疗保健中采用和维持患者驱动的创新,了解患者与提供者的相互依赖关系和提供者对产生价值的观点是至关重要的。
    BACKGROUND: Patient-driven innovation in health care is an emerging phenomenon with benefits for patients with chronic conditions, such as cystic fibrosis (CF). However, previous research has not examined what may facilitate or hinder the implementation of such innovations from the provider perspective.
    OBJECTIVE: The aim of this study was to explain variations in the adoption of a patient-driven innovation among CF clinics.
    METHODS: A comparative multiple-case study was conducted on the adoption of a patient-controlled app to support self-management and collaboration with health care professionals (HCPs). Data collection and analysis were guided by the nonadoption, abandonment, spread, scale-up, and sustainability and complexity assessment tool (NASSS-CAT) framework. Data included user activity levels of patients and qualitative interviews with staff at 9 clinics (n=8, 88.9%, in Sweden; n=1, 11.1%, in the United States). We calculated the maximum and mean percentage of active users at each clinic and performed statistical process control (SPC) analysis to explore how the user activity level changed over time. Qualitative data were subjected to content analysis and complexity analysis and used to generate process maps. All data were then triangulated in a cross-case analysis.
    RESULTS: We found no evidence of nonadoption or clear abandonment of the app. Distinct patterns of innovation adoption were discernable based on the maximum end-user activity for each clinic, which we labeled as low (16%-23%), middle (25%-47%), or high (58%-95%) adoption. SPC charts illustrated that the introduction of new app features and research-related activity had a positive influence on user activity levels. Variation in adoption was associated with providers\' perceptions of care process complexity. A higher perceived complexity of the value proposition, adopter system, and organization was associated with lower adoption. In clinics that adopted the innovation early or those that relied on champions, user activity tended to plateau or decline, suggesting a negative impact on sustainability.
    CONCLUSIONS: For patient-driven innovations to be adopted and sustained in health care, understanding patient-provider interdependency and providers\' perspectives on what generates value is essential.
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  • 文章类型: Journal Article
    在阿姆哈拉地区的高地主要种植桉树构成了巨大的风险,因为任何影响该物种的疾病/昆虫爆发都可能导致全国大片贫瘠的土地。因此,该研究旨在探索各种桉树物种多样化的适应性,并防止潜在的生态系统破坏。六种不同的桉树种类(E.球,卡玛尔登,E.Grandis,E.saligna,E.viminalis,和E.citiodora)进行随机完整设计,重复三次。使用R版本4.3.1的描述性和推断性统计来测量和分析所有所需的参数。在P<0.001的高度上观察到桉树物种之间的统计学差异,存活率,volume,和平均年增量。总之,E.viminalis,E.saligna,和E.grandis是瓦德拉和埃塞俄比亚类似高地地区桉树种植者的可行替代品。这项研究强调了在面对优势物种的潜在威胁时,使桉树物种多样化以增强韧性和可持续性的重要性。球桉树。
    The predominant cultivation of Eucalyptus globulus in the highlands of the Amhara region poses a significant risk, as any disease/insect outbreak affecting this species could result in extensive barren lands across the country. Therefore, the study aimed to explore the adaptability of various Eucalyptus species to diversify and safeguard against potential ecosystem disruptions. Six different Eucalyptus species (E.globulus, E.camaldulensis, E.grandis, E.saligna, E.viminalis, and E.citiodora) were subjected to a Randomized Complete Design with three replications. All the required parameters were measured and analyzed using descriptive and inferential statistics with R version 4.3.1. Statistically significant variations were observed between Eucalyptus species at P < 0.001 in height, survival rate, volume, and mean annual increment. In conclusion, E.viminalis, E.saligna, and E. grandis are viable alternatives for Eucalyptus growers in Wadela and similar highland areas of Ethiopia. This research underscores the importance of diversifying Eucalyptus species to enhance resilience and sustainability in the face of potential threats to the dominant species, Eucalyptus globulus.
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  • 文章类型: Systematic Review
    背景:复杂的健康干预措施(CHIs)越来越多地用于公共卫生,临床研究和教育,以减轻全球疾病负担。众多的理论,已经开发了模型和框架(TMF)来支持CHI的实施。本系统综述旨在确定和批评与实施的三个特征有关的理论框架;适应性,可扩展性和可持续性(ASaS)。通过拆除组成理论,分析他们的组成部分概念,然后探索影响每个理论的因素,审查小组希望在实施CHIs时提供对注意事项的增强理解。
    方法:这篇评论搜索了PubMedMEDLINE,CINAHL,WebofScience,和谷歌学者研究复杂健康干预措施的TMF。叙事综合被用来检查可能影响适应性的因素,复杂健康干预措施的可扩展性和可持续性。
    结果:从五个数据库中检索到总共9763项研究(PubMed,MEDLINE,CINAHL,WebofScience,和谷歌学者)。删除重复项并应用资格标准后,35篇论文有资格入选。影响因素可以在外部环境(社会政治环境;领导资金,组织间网络),内部环境;(客户倡导;组织特征),干预特征(监督,监测和评估),和桥接因素(个人采用者或提供者特征)。
    结论:这项审查证实,已确定的TMFS通常不包括适应性的三个组成部分,可扩展性,和可持续性。目前的方法侧重于高收入国家或通用的“全世界”方法,很少有针对低收入和中等收入国家的框架。该评论为进一步探索适应性提供了起点,可扩展性和可持续性,在中低收入背景下。
    背景:未注册。
    BACKGROUND: Complex health interventions (CHIs) are increasingly used in public health, clinical research and education to reduce the burden of disease worldwide. Numerous theories, models and frameworks (TMFs) have been developed to support implementation of CHIs. This systematic review aims to identify and critique theoretical frameworks concerned with three features of implementation; adaptability, scalability and sustainability (ASaS). By dismantling the constituent theories, analysing their component concepts and then exploring factors that influence each theory the review team hopes to offer an enhanced understanding of considerations when implementing CHIs.
    METHODS: This review searched PubMed MEDLINE, CINAHL, Web of Science, and Google Scholar for research investigating the TMFs of complex health interventions. Narrative synthesis was employed to examine factors that may influence the adaptability, scalability and sustainability of complex health interventions.
    RESULTS: A total of 9763 studies were retrieved from the five databases (PubMed, MEDLINE, CINAHL, Web of Science, and Google Scholar). Following removal of duplicates and application of the eligibility criteria, 35 papers were eligible for inclusion. Influencing factors can be grouped within outer context (socio-political context; leadership funding, inter-organisational networks), inner context; (client advocacy; organisational characteristics), intervention characteristics (supervision, monitoring and evaluation), and bridging factors (individual adopter or provider characteristics).
    CONCLUSIONS: This review confirms that identified TMFS do not typically include the three components of adaptability, scalability, and sustainability. Current approaches focus on high income countries or generic \"whole world\" approaches with few frameworks specific to low- and middle-income countries. The review offers a starting point for further exploration of adaptability, scalability and sustainability, within a low- and middle-income context.
    BACKGROUND: Not registered.
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  • 文章类型: Journal Article
    这项研究探讨了大流行等危机如何影响家庭动态以及父母和孩子面临新困难和挑战的方式。本研究调查了儿童和年轻人的情绪状态,家庭复原力的维度,以及冠状病毒大流行期间应对策略的类型和父母的情绪状态。该研究的最终样本由来自罗马尼亚的1,010名父母代表。
    当前的科学研究是一项横向研究,旨在了解父母和儿童/年轻人面临的情感困难以及他们在危机中采取的应对策略,比如冠状病毒大流行的时间。
    适应不良应对策略的父母受到大流行的影响更大。此外,结果表明,父母应对策略与儿童的情绪状态之间存在显著的相关性,和适应性水平。因此,测量适应不良应对的子量表上的高分表明抑郁水平的高分,焦虑,和父母的压力。家庭韧性,通过“家庭中的沟通和解决问题”维度,在父母抑郁与反思性适应不良应对策略之间的关系中具有调节作用。通过“保持积极态度”的家庭韧性在灾难化与青少年适应能力水平之间的关系中具有调节作用。
    研究结果指出了家庭复原力在家庭系统中的作用和位置,以及一段危机如何影响该系统。
    UNASSIGNED: This research explored how crises such as the pandemic influence the family dynamic and the way that the parents and the children face new difficulties and challenges. The present study investigates children\'s and young people\'s emotional states, the dimensions of family resilience, and the types of coping strategies and parents\' emotional states during the coronavirus pandemic. The final sample for the research was represented by 1,010 parents from Romania.
    UNASSIGNED: The present scientific research is a transversal study with the scope to understand the emotional difficulties that parents and children/ young people face and the coping strategies that they adopt in a crisis, such as the time of the coronavirus pandemic.
    UNASSIGNED: Parents with maladaptive coping strategies are more affected by the pandemic. Also, the results indicate that there is a significant correlation between parental coping strategies and the children\'s emotional states, and the adaptability level. Therefore, the high scores on the subscales which measure maladaptive coping indicate high scores of the levels of depression, anxiety, and stress of the parents. Family resilience, through the dimension of \'communication and problem-solving in the family\' has a moderation role in the relationship between parental depression and the maladaptive coping strategy of rumination. Family resilience through \'maintaining a positive attitude\' has a moderation role in the relationship between catastrophizing and the teenagers\' level of adaptability.
    UNASSIGNED: The results of the study pointed out the role and place of family resilience within the family system and how a period of crisis can affect this system.
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  • 文章类型: Journal Article
    分析绵羊(Ovisaries)的遗传多样性和选择特征对于了解其环境适应性具有重要价值。提高育种效率,实现遗传资源的有效保护和合理利用。在这项研究中,我们利用了来自塔克拉玛干沙漠南缘的四个本地绵羊品种的IlluminaOvineSNP50KBeadChip数据(多郎羊:n=36,和田羊:n=74,昆仑羊:n=27,齐拉黑羊:n=178)和三个外国肉羊品种(PollDorset羊:n=105,萨福克羊:n=153,Texel=150),遗传多样性,和本地绵羊体内正选择的基因组信号。根据主成分分析(PCA),邻居连接树(NJ树),和混合物,根据地理分布,我们揭示了这七个绵羊品种的不同聚类模式。然后使用跨群体扩展单倍型纯合性(XP-EHH),固定指数(FST),和综合单倍型评分(iHS),我们在四个本地绵羊品种中确定了一组32个重叠基因的阳性选择。这些基因与羊毛毛囊发育和羊毛性状有关,沙漠环境适应性,抗病性,繁殖,和高海拔适应性。这项研究揭示了塔克拉玛干沙漠南部边缘本地绵羊品种在极端沙漠环境中的种群结构和基因组选择特征,为在极端环境中保护和可持续利用本地绵羊遗传资源提供新的见解。此外,这些发现为绵羊和其他哺乳动物适应全球气候变化提供了宝贵的遗传资源。
    Analyzing the genetic diversity and selection characteristics of sheep (Ovis aries) holds significant value in understanding their environmental adaptability, enhancing breeding efficiency, and achieving effective conservation and rational utilization of genetic resources. In this study, we utilized Illumina Ovine SNP 50 K BeadChip data from four indigenous sheep breeds from the southern margin of the Taklamakan Desert (Duolang sheep: n = 36, Hetian sheep: n = 74, Kunlun sheep: n = 27, Qira black sheep: n = 178) and three foreign meat sheep breeds (Poll Dorset sheep: n = 105, Suffolk sheep: n = 153, Texel sheep: n = 150) to investigate the population structure, genetic diversity, and genomic signals of positive selection within the indigenous sheep. According to the Principal component analysis (PCA), the Neighbor-Joining tree (NJ tree), and Admixture, we revealed distinct clustering patterns of these seven sheep breeds based on their geographical distribution. Then used Cross Population Extended Haplotype Homozygosity (XP-EHH), Fixation Index (FST), and Integrated Haplotype Score (iHS), we identified a collective set of 32 overlapping genes under positive selection across four indigenous sheep breeds. These genes are associated with wool follicle development and wool traits, desert environmental adaptability, disease resistance, reproduction, and high-altitude adaptability. This study reveals the population structure and genomic selection characteristics in the extreme desert environments of native sheep breeds from the southern edge of the Taklimakan Desert, providing new insights into the conservation and sustainable use of indigenous sheep genetic resources in extreme environments. Additionally, these findings offer valuable genetic resources for sheep and other mammals to adapt to global climate change.
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  • 文章类型: Journal Article
    作为昆虫不可或缺的一部分,肠道共生菌在昆虫的生长发育和适应性中起着至关重要的作用。石竹,遗留植物的主要害虫,对棘刺种群的发展构成严重威胁。在本研究中,16SrDNA和内部转录间隔区高通量测序技术用于分析肠道微生物的结构和昆虫在两种不同植物上取食的多样性,以及夏枯草的肠道微生物之间的相似性。还基于测序数据比较了叶片内生菌的优势细菌。结果表明,变形杆菌,Firmicutes,放线菌是肠道细菌的优势门,子囊菌是肠道真菌的优势门。异型根瘤菌-新根瘤菌-副根瘤菌-根瘤菌,甲基细菌-甲基细菌,肠球菌是以两种植物为食的蓝藻肠道中的优势属,两组的相对丰度差异显著。念珠菌是两组中常见的肠道真菌的优势属,两组之间的丰度没有显着差异。这表明,与夏枯草的肠道真菌相比,肠道细菌的丰度受食物的影响很大。刺五加叶中微生物与昆虫肠道之间的共同核心微生物群表明两者之间存在微生物交换。网络相关图显示,以Gynosphaerametteniana为食的蓝藻肠道微生物之间的关系更为密切,这可以帮助宿主更好地应对不利的外部环境。本研究为蓝藻的适应机制研究提供了理论依据,为蓝藻的有效防控提供了新的方向。
    As an indispensable part of insects, intestinal symbiotic bacteria play a vital role in the growth and development of insects and their adaptability. Rhoptroceros cyatheae, the main pest of the relict plant Alsophila spinulosa, poses a serious threat to the development of the A. spinulosa population. In the present study, 16S rDNA and internal transcribed spacer high-throughput sequencing techniques were used to analyze the structure of intestinal microbes and the diversity of the insect feeding on two different plants, as well as the similarities between the intestinal microorganisms of R. cyatheae. The dominant bacteria of leaf endophytes were also compared based on the sequencing data. The results showed that Proteobacteria, Firmicutes, and Actinobacteria were the dominant phyla of intestinal bacteria, and Ascomycota was the dominant phylum of intestinal fungi. Allorhizobium-Neorhizobium-Pararhizobium-Rhizobium, Methylobacterium-Methylorubrum, and Enterococcus were the dominant genera in the intestine of R. cyatheae feeding on two plants, and the relative abundance was significantly different between the two groups. Candida was the common dominant genus of intestinal fungi in the two groups, and no significant difference was observed in its abundance between the two groups. This showed that compared with the intestinal fungi of R. cyatheae, the abundance of the intestinal bacteria was greatly affected by food. The common core microbiota between the microorganisms in A. spinulosa leaves and the insect gut indicated the presence of a microbial exchange between the two. The network correlation diagram showed that the gut microbes of R. cyatheae feeding on Gymnosphaera metteniana were more closely related to each other, which could help the host to better cope with the adverse external environment. This study provides a theoretical basis for the adaptation mechanism of R. cyatheae and a new direction for the effective prevention and control of R. cyatheae.
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  • 文章类型: Journal Article
    体积压裂的概念彻底改变了传统的低渗透极限,扩大有效资源空间,在致密油藏开发中显著提高了油井产量。本文综合考虑多裂缝起生范围等多种因素,阐明致密砂岩油藏体积压裂技术的机理,远井水平主应力对裂缝起生和扩展的影响,自然裂缝发育程度,和储层岩石力学参数。通过基于储层岩石力学参数的模拟,将模型计算的岩石破裂压力值与研究区压裂施工井的实测数据进行了比较分析。结果表明,模型计算与实际数据之间存在10%的差异。通过模拟不同压裂液注入量的影响,抽水率,和裂缝几何形状上的穿孔方法,得到了体积压裂工艺的优化设计参数。此外,提出了适用于现场作业的施工参数优化思路和建议。模拟结果表明,建议储层的最小推荐流体体积规模超过1800m3。根据摩擦计算,建议现场施工速率不低于18.0m3/min,以及用于穿孔目的的36-48孔/段。本文提出的数值模拟研究为压裂网络技术在致密砂岩油藏中的应用提供了理论参考依据和实践指导。
    The concept of volume fracturing has revolutionized the conventional limits of low permeability, expanded the effective resource space, and significantly enhanced oil well production in tight oil reservoir development. This paper elucidates the mechanism of volume fracturing technology for tight sandstone reservoirs by considering multiple factors such as the initiation range of multi-fractures, influence of far-well horizontal principal stress on fracture initiation and propagation, degree of natural fractures development, and mechanical parameters of reservoir rock. Through simulation based on the mechanical parameters of reservoir rock, a comparative analysis was conducted between the model-calculated rock fracture pressure value and measured data from fracturing construction wells in the study area. The results revealed that there was a discrepancy within 10% between the model calculations and actual data. By simulating the effects of different injection volumes of fracturing fluid, pumping rates, and perforation methods on the fracture geometry, optimal design parameters for volume fracturing technology were obtained. Additionally, we propose optimization ideas and suggestions for construction parameters applicable to field operations. The simulation results indicate that a minimum recommended fluid volume scale exceeding 1800 m3 is advised for the reservoir. Based on frictional calculations, it is recommended to have an on-site construction rate not less than 18.0 m3/min along with 36-48 holes/section for perforation purposes. The numerical simulation research presented in this paper provides a theoretical reference basis and practical guidance for the application of fracturing network technology in tight sandstone reservoirs.
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  • 文章类型: Journal Article
    人乳头瘤病毒(HPV)81型最近已成为最常见的低风险HPV类型之一;关注它的文献是有限的。本研究旨在分析HPV81检出率增高的原因,并探讨其致病力的演变过程。我们分析了从2014年到2023年收集的229061个脱落的宫颈细胞样本中HPV81的检出率和趋势;收集了来自两个不同时间段的HPV81单个感染的样本;并分析了等位基因频率,积极选择,病毒载量,持续性感染能力,E6和E7基因型的致病性。我们发现HPV81在宫颈脱落细胞中的检出率在低风险类型中排名第一,并表现出明显的上升趋势(p<0.001)。HPV81的E6原型等位基因的频率(n=317)显着增加(p=0.018),并表现出最强的适应能力。E6原型的病毒载量和持续感染能力明显高于突变体,从而成为提高HPV81检出率和增强其致病性的关键驱动因素。病毒载量与持续感染能力和致病性呈正相关。持续感染是HPV81致病性的关键因素。HPV81的成功适应性进化伴随着增强的致病性。
    Human papillomavirus (HPV) type 81 has recently become one of the most common low-risk HPV types; however, literature focusing on it is limited. This study aimed to analyze the reasons for the increased detection rate of HPV81 and investigate its evolving pathogenicity. We analyzed the detection rates and trends of HPV81 in 229 061 exfoliated cervical cell samples collected from 2014 to 2023; collected samples of HPV81 single infections from two different time periods; and analyzed the allele frequencies, positive selection, viral load, persistent infection capacity, and pathogenicity of E6 and E7 genotypes. We found that the detection rate of HPV81 ranked first among the low-risk types in exfoliated cervical cells and exhibited a significantly increasing trend (p < 0.001). The frequency of the E6 prototype allele of HPV81 (n = 317) was significantly increased (p = 0.018) and demonstrated the strongest adaptive capacity. The viral load and persistent infection capacity of the E6 prototype were significantly higher than those of the mutants, thus serving as key drivers for increasing the detection rate of HPV81 and enhancing its pathogenicity. The viral load was positively correlated with persistent infection capacity and pathogenicity. Persistent infection was a crucial factor in the pathogenicity of HPV81. Successful adaptive evolution of HPV81 is accompanied by enhanced pathogenicity.
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