Essentials in the use of mycolic acid biomarkers for tuberculosis detection: response to “High-throughput mass spectrometric analysis of 1400-year-old mycolic acids as biomarkers for ancient tuberculosis infection” by

High molecular weight long-chain mycolic acids are key structural components of the cell envelope of Mycobacterium tuberculosis and they are established as biomarkers for the identification of both ancient and modern tuberculosis. Mycolic acids from M. tuberculosis have a characteristic profile, reflecting contributions from five major distinct homologous series of mycolate structural types. Diagnosis of tuberculosis in archaeological material, using mycolic acid biomarkers, depends on objective recognition of the key characteristic mycolic acid components. A recent article in this journal claimed that tuberculosis could be confirmed in ancient bones by high throughput mass spectrometric analysis of mycolic acids. Scrutiny of the data presented reveals no convincing evidence for the presence of mycolic acids, characteristic of the M. tuberculosis complex, in the skeletal remains examined. This communication reviews the essential criteria necessary for positive tuberculosis diagnosis, using mycolic acids.     

Water resources, institutions, & intrastate conflict

Although linkages between water scarcity and conflict have received a great deal of attention, both in qualitative case studies as well as quantitative studies, the relationship remains unclear since the literature has generally not considered the effectiveness of governance. We distinguish between direct effects and indirect effects linking water resource scarcity and conflict by systematically examining how intervening factors, such as political institutions, might influence the impact of water scarcity on the probability of conflict. We find support for our hypotheses postulating both direct and indirect relationships between water scarcity, governance, and conflict.     

Quantifying tomb geometries in resistivity images using watershed algorithms

Quantifying the geometries (defined here as width, height and depth of burial) of archeological structures within resistivity models produced as a result of the regularization constraints used in most inversion algorithms is difficult, especially when structures are closely spaced. Here we apply the watershed by simulated immersion method of boundary detection to smooth 2D resistivity images generated for synthetic and field data over 3D targets. The synthetic studies include a single cavity model, a model for two widely spaced cavities (spacing ? unit electrode spacing) and a model for two closely spaced cavities (spacing < unit electrode spacing). We also examine a single-cavity model where a relatively resistive overburden, common at archaeological sites in Egypt, is included. In the case of the single cavity models, the maximum error for any geometries are 18% for the model without the resistive overburden and 10% for the model where the overburden is included, whereas it increases to 24% for the widely spaced model and 40% for the closely spaced model. Despite, the higher errors in the closely spaced cavity model, application of the algorithm confirms the presence of two features, which is not ascertainable from the smooth resistivity images. Boundaries detected with the watershed algorithm are subsequently used to define a disconnect in the regularization, resulting in a markedly improved estimate of the resistivity structure (particularly for the closely spaced cavity model) in a second inversion step using the model obtained from the smoothness constraint inversion as the starting model. This revised resistivity model also results in a lower root-mean-square (rms) misfit between measured and theoretical data, and between synthetic and inverted models. We demonstrate how the method can be applied on images from the archaeological site at Qurnet Murai, Luxor City Egypt.     

Current Research on the Gulf Coast of Mexico

The Gulf Coast of Mesoamerica is a culturally and environmentally heterogeneous area that encompasses the lowlands along the Gulf of Mexico as well as rugged inland highlands. Blessed with a wealth of valued resources and a favorable geographical setting, the pre-Hispanic Gulf Coast played a critical role as a cultural and economic crossroads, and its cultures contributed vital elements to other Mesoamerican traditions. Gulf Coast archaeology currently is experiencing the most active period in its history. This recent research underscores the diversity and dynamism of the area's cultures and environment. An enormous expansion of settlement pattern studies reveals considerable diversity in sociopolitical organization, urbanism, and human–land relationships. A second important trend focuses on documenting and understanding variation in craft production and exchange systems. A third is the continuing emphasis on interregional interaction through all time periods. These three foci merge in a growing interest in variation and change in Gulf Coast political economies. Future research will need to incorporate theoretical perspectives that focus on the generation of cultural variation, including agency-based models of technological choice and political economy, as well as those, like Darwinian approaches, that emphasize the differential persistence of variation.     

世界范围内的环境保护主义:在市民运动和政府决策之间

本文通过概述西方环境保护主义在市民与政府之间的发展历程,认识到环境保护主义在不同的时代有不同的讨论议题与内容,而不同的人群对于谁才是环境保护主义者的精英分子也有不同的看法。1970年前后是环境保护主义的转折点,从那时起,环境保护主义关注的议题由单一的要素转向一个综合的网络,并形成了全球范围的广泛联系,在大众运动和广泛的社会关注之下,环境保护主义的政治力量越来越多地显示出来。     

世界范围内的环境保护主义:一种不同的观点

亚克西姆·纳德考(Joachi m Radkau)不仅是德国最重要的环境史学家,而且代表了一代人对1970年代环境事件的看法。本文意欲从更加年轻一代的观点出发,补充亚克西姆·纳德考的观点。1970年代的环境保护主义者经常用他们那个时代的议程作为自我证据,但是年轻一代的环境保护主义者倾向于采取一种更加批判的态度来看待此问题,即从后来发生的事实的角度来看待。因此,过去的环境议程常常被年轻的一代看作是强迫的和错误指导的议程。环境保护主义者经常从一个宽泛的环境问题中选择几个问题给予特别的关注,而历史学家需要仔细地研究是什么指导了环境保护主义者的选择。因此,不仅仅将环境保护主义看作是知识分子的事业,而且看作是他们的一种生活方式,并且进一步考察环境议程与环境保护主义者的日常生活是如何联系起来的。这是一件有意义的事情。此外,环境史学家需要注意环境争论中不同的国家特色。许多国家都发展出了完全不同的具有国家特色的环境保护主义,尽管近年来世界环境保护主义出现了趋向一致的倾向,但是这些不同的国家发展道路还没有褪色到足以被忽视的地步。最后,本文呼吁,要对环境意识从一代向下一代的转变给予更多的关注。将来的环境保护主义也许与今天的环境保护主义有相当大的区别,或许环境保护主义将来根本就不存在了。进一步仔细观察,环境保护主义是一个不稳定的、脆弱的事物。     

元清两代北京万柳堂园林的变迁

万柳堂是北京古代著名的私家园林,元代廉希宪创始,清代冯溥沿用其名而异地另建,在当代北京地名中虽有遗迹可寻,但彼此地望相差甚远。本文辨析了元代万柳堂的所在地点以及清代多种有关文献存在的错误,讨论了两个万柳堂的环境特点、兴衰过程、历史影响及其人文意义。     

False,cheap and degraded: when history,economy and environment collided at Cades Cove,Great Smoky Mountains National Park

Great Smoky Mountains National Park was created in 1934 after decades of popular activism. The National Park Service initially planned to restore wildness to all formerly settled lands through the process of secondary succession, but did not in a valley in the northwest corner of the park, Cades Cove. Transforming the 1200-ha agricultural setting into forest would have eliminated the visual charm highly prized by the tourists who had long come there. Additionally, experts promoted the preservation of Cades Cove's historic–cultural landscape because they falsely perceived the local culture to be a relic of the past. The Park Service acceded, but its commitment to historic preservation was tempered by a concern to minimize its expenses. Consequently, an agricultural permit system was adopted in 1945, which allowed modern farmers to operate on the historic landscape, keeping it open. This cheap method kept open the beautiful vistas of Cades Cove. Unfortunately, the agency's commitment to beauty and economy led to decades of ecological degradation, including water pollution and species extirpation. Only in the last two decades, has park management moved away from its focus on a low-cost, attractive landscape to embrace one that is also ecologically healthy, and thus more sustainable.     

Late Postclassic lowland Maya archaeology

The archaeology of the Late Postclassic lowland Maya (ca. A.D. 1200–1517) is summarized and reviewed. The history of past research is outlined, and investigations on topics of major scholarly concern are discussed. The current data allow us to present an approximate reconstruction of the events and processes that characterize the period, although the information on many areas and topics is still fragmentary. Research in Maya archaeology has focused heavily on the more spectacular developments of earlier periods, creating the impression that the last few centuries of the prehispanic era were a time of disorganization and decline. New data and interpretations indicate that the Late Postclassic was a dynamic period in which the lowland Maya were moving in new directions, restructuring their society and worldview.     

市内激励源对古建筑振动的影响

为了分析在不同激励下振动对古建筑的影响,选择苏州市省级文物保护单位——玉涵堂古建筑进行振动测试。记录了环境振动、地下轨道交通激励、人群社会活动激励和音响激励四种工况时一座两层砖木阁楼的振动信号。发现经过严格振动控制的地下轨道交通激励对古建筑振动的贡献可以忽略;环境振动和音响激励时段古建筑横向振动速度达标,而人群社会活动激励时段横向振动速度超标。从古建筑的建筑结构和功能区域划分以及人的激励形式三个方面对通常被忽视的人的因素进行了探讨,并提出了相应的减振措施。研究成果为其它类似两层砖木阁楼古建筑防护提供依据。