Intercontinental comparison

  • 文章类型: Journal Article
    大都市化已成为21世纪城市化的突出特征。为了全面了解全球城市化模式和路径,以及解释它们的后果和含义,我们旨在提供发达国家和发展中国家大都市区城市转型的比较特征。这里,我们量化和比较了城市增长率,增长模式,城市景观指标,以及美国21个代表性大都市地区的城市土地和人口的共同进化,欧洲,和中国从1985年到2020年,使用遥感不透水表面动态数据集和基于斑块的分析。结果表明,各都市区都经历了规模和增长率不同的大规模城市扩张。与发达国家相比,发展中国家的城市化水平相对较低,但城市化速度更快。空间上,随着填充膨胀的增加甚至占主导地位,美国和欧洲的大都市地区发展成为更紧凑的中心城市核心,展示合并的轨迹。中国大都市区主要通过同心环的边缘扩展来实现点轴城市发展。此外,在美国和欧洲,城市面积和人口的横向协同演化总体上表现出稳定的规模经济,而在中国则从不经济过渡到规模经济,证明发达国家走过的长达一个世纪的城市化历程可以在几十年内由新兴发展中国家完成。暂时,除伦敦外,城市扩张大大超过了所有大都市地区的人口增长,标志着城市土地利用效率仍然是大都市世纪的重大挑战。有效的大都市治理应针对空间结构进行调整,以实现有效的城市土地利用和城际协调发展,从而实现可持续的城市未来。特别是新兴大都市的发展中国家。
    Metropolization has emerged as a prominent feature of 21st-century urbanization. To gain a comprehensive understanding of global urbanization patterns and pathways, as well as to interpret their consequences and implications, we aimed to provide a comparative characterization on urban transformation in metropolitan areas of developed and developing countries. Here, we quantified and compared the urban growth rates, growth modes, urban landscape metrics, and the co-evolution of urban land and population in 21 representative metropolitan areas across the United States, Europe, and China from 1985 to 2020, using remotely sensed impervious-surface dynamic dataset and patch-based analyses. The results showed that each metropolitan area has experienced substantial urban expansion with different scales and growth rates. Developing China possessed a relatively lower urbanization level but urbanized faster compared to the developed counterparts. Spatially, with infilling expansion increasing and even dominating, American and European metropolitan areas developed into more compact central urban cores, demonstrating the coalesced trajectories. Chinese metropolitan areas showed point-axis urban development mainly via edge-expansion in concentric rings. Furthermore, the horizontal co-evolution of urban area and population generally showed stable economies of scale in the United States and Europe whereas transitioned from diseconomy to economy of scale in China, evidencing that the century-long urbanization journey traversed by developed countries can be completed by emerging-developing ones within several decades. Temporally, the urban expansion greatly outpaced population growth in all metropolitan areas except London, signifying that urban land use efficiency is still a grand challenge in the Metropolitan Century. Effective metropolitan governance should be tailored to spatial configuration for efficient urban land use and intercity coordinated development towards a sustainable urban future, particularly for developing countries with emerging metropolization.
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  • 文章类型: Journal Article
    目的:本研究的目的是在洲际比较中评估接受治疗的乳腺癌(BC)女性的基线数据。
    方法:这项研究包括来自欧洲的99,571名女性BC(70,834),亚洲(18,208),和拉丁美洲(10,529)在2017年至2021年之间注册,基于IQVIA肿瘤学动态数据库的数据。该来源通过横断面部分回顾性调查提供信息,该调查收集了由肿瘤学家代表小组治疗的住院患者和门诊患者的匿名数据。使用多变量逻辑回归模型来研究转移的可能性。
    结果:亚洲(98%)和拉丁美洲(100%)的可用数据是医院数据,而在欧洲,患者在医院和办公室诊所接受治疗(62%,38%)。亚洲和拉丁美洲的平均年龄(57±13)低于欧洲(61±13;p<0.001)。与亚洲和拉丁美洲相比,欧洲的小叶BC被诊断为两倍(15.2%,9.8%,8.0%)。欧洲和拉丁美洲的转移性激素受体阳性(HR)BC患者人数明显高于亚洲(76%,68%;p<0.001)。据报道,女性转移BC的人数最多(26%,而14%和20%,分别,在亚洲和拉丁美洲)。在各大洲,女性BC发生骨转移的比例为51-61%,30-39%的肺和25-32%的肝脏,其次是3-6%的皮肤和3%的大脑。
    结论:与亚洲和拉丁美洲的女性相比,在欧洲接受治疗的女性往往年龄更大,并且更容易发生转移。除了肺转移.
    OBJECTIVE: The aim of the study was to evaluate the baseline data of women with breast cancer (BC) undergoing treatment in an intercontinental comparison.
    METHODS: This study included 99,571 women with BC from Europe (70,834), Asia (18,208), and Latin America (10,529) enrolled between 2017 and 2021, based on data from IQVIA\'s Oncology Dynamics database. This source is supplied with information by means of a cross-sectional partially retrospective survey collecting anonymized data on inpatients and outpatients treated by a representative panel of oncologists. A multivariable logistic regression model was used to investigate the probability of metastases.
    RESULTS: The data available in Asia (98%) and Latin America (100%) were hospital data, while in Europe, patients were treated both in hospitals and in office-based practices (62%, 38%). The mean age in Asia and Latin America (57 ± 13) was lower than in Europe (61 ± 13; p < 0.001). Lobular BC was diagnosed twice as often in Europe compared to Asia and Latin America (15.2%, 9.8%, 8.0%). The number of patients with metastasized hormone receptor-positive (HR +) BC was significantly higher in Europe and Latin America than in Asia (76%, 68%; p < 0.001). The highest number of women with metastasized BC was reported in Europe (26% compared to 14% and 20%, respectively, in Asia and Latin America). Across the continents, the percentage of women with BC who experienced metastases was 51-61% for bone, 30-39% for lung and 25-32% for liver, followed by 3-6% for skin and 3% for brain.
    CONCLUSIONS: Women with BC treated in Europe tend to be significantly older and more likely to develop metastases than women in Asia and Latin America, except for lung metastases.
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  • 文章类型: Journal Article
    目标:尽管对全球生物多样性的模式进行了充分的研究,关于潜在的机制及其在生物地理尺度上的普遍性,仍然存在有争议的争论。特别是,目前还不清楚沿环境梯度的多样性模式在多大程度上是由非生物因素直接驱动的,如气候,或通过生物因子间接介导,比如资源对消费者的影响。
    方法:安第斯,厄瓜多尔南部;山。乞力马扎罗山,坦桑尼亚。
    方法:我们在分类学水平上研究了肉果植物和禽类食肉动物的多样性,也就是说,物种丰富度和丰度,以及在功能特征层面,也就是说,功能丰富和功能分散。我们比较了新热带地区和非洲热带地区山区系统中两个重要的生物多样性热点。我们使用了植物和鸟类群落的野外数据,包括367种植物和鸟类的性状测量。使用结构方程模型,我们解开了气候和植物群落多样性对鸟类群落多样性的直接和间接影响。
    结果:我们在分类水平上发现了水果多样性对水果多样性的显着自下而上的影响。相比之下,气候对于功能多样性的模式更重要,植物群落主要与降水有关,鸟类群落与温度密切相关。
    结论:我们的结果说明了自下而上的机制对消费者分类多样性的普遍重要性,表明了主动资源跟踪的重要性。我们的结果还表明,可能很难识别跨生物地理区域的功能性植物和动物性状之间的生态拟合信号,因为不同的物种群体可能对不同的气候驱动因素做出反应。在未来的气候变化下,如果动植物群落始终与不同的气候驱动因素相关,资源和消费者群落之间的这种脱钩可能会增加。
    OBJECTIVE: Although patterns of biodiversity across the globe are well studied, there is still a controversial debate about the underlying mechanisms and their generality across biogeographic scales. In particular, it is unclear to what extent diversity patterns along environmental gradients are directly driven by abiotic factors, such as climate, or indirectly mediated through biotic factors, such as resource effects on consumers.
    METHODS: Andes, Southern Ecuador; Mt. Kilimanjaro, Tanzania.
    METHODS: We studied the diversity of fleshy-fruited plants and avian frugivores at the taxonomic level, that is, species richness and abundance, as well as at the level of functional traits, that is, functional richness and functional dispersion. We compared two important biodiversity hotspots in mountain systems of the Neotropics and Afrotropics. We used field data of plant and bird communities, including trait measurements of 367 plant and bird species. Using structural equation modeling, we disentangled direct and indirect effects of climate and the diversity of plant communities on the diversity of bird communities.
    RESULTS: We found significant bottom-up effects of fruit diversity on frugivore diversity at the taxonomic level. In contrast, climate was more important for patterns of functional diversity, with plant communities being mostly related to precipitation, and bird communities being most strongly related to temperature.
    CONCLUSIONS: Our results illustrate the general importance of bottom-up mechanisms for the taxonomic diversity of consumers, suggesting the importance of active resource tracking. Our results also suggest that it might be difficult to identify signals of ecological fitting between functional plant and animal traits across biogeographic regions, since different species groups may respond to different climatic drivers. This decoupling between resource and consumer communities could increase under future climate change if plant and animal communities are consistently related to distinct climatic drivers.
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