Is Cross‐Section Shape a Distinct Feature in Plant Fibre Identification?

Correct identification of textile fibres is an important issue in archaeology because the use of different materials can yield crucial information about the society that produced the textiles. Textiles made of plant and animal fibres can normally be easily distinguished, but to distinguish between different types of plant fibres, in particular different types of bast fibres, is difficult. Some years back it was shown that the features fibre diameter, lumen diameter, dislocation (nodes), and cross markings cannot be used on their own to distinguish between the typical bast fibres used for textiles in ancient Europe: flax, hemp, and nettle. Particularly not when only a few fibres are available for an examination so that statistical analysis is not possible, as is often the case in archaeology. The last two characterization features typically used to distinguish between bast fibres are cross‐section shape and lumen shape. In this paper, we present a study of retted and unretted fibres (in the stem) of flax, nettle, and hemp, and show that also cross‐section shape and lumen shape cannot be used as distinguishing features on their own.     

三种植物精油对博物馆空气霉菌的抑菌活性研究

从广西民族博物馆易滋生霉菌的展柜里分离、纯化及鉴定了三株霉菌,并研究香叶精油、罗勒精油和山苍子精油对霉菌的抑菌效果,测试这些植物精油喷洒于纸张表面后纸样的防霉性及鉴定三种精油的主要抑菌活性成分。实验结果显示,三种供试植物精油对霉菌均具有显著的抑菌效果,在纸张上的防霉效果也很明显,其综合抑菌效果大小为:香叶精油罗勒精油山苍子精油。GC-MS分析表明,香叶精油的主要活性成分为:香叶醇(56.73%)、橙花醇(38.31%)。罗勒精油的主要活性成分为:丁香酚(83.14%),己二醇(16.15%)。山苍子精油的主要活性成分为:柠檬醛(36.01%),(Z)-3,7-二甲基-2,6-辛二烯醛(29.71%)和柠檬烯(16.67%)。植物精油作为博物馆展存环境的空气防霉剂具有良好的应用前景。     

Nuclear Superiority in the Age of Parity: US Planning,Intelligence Analysis,Weapons Innovation and the Search for a Qualitative Edge 1969–1976

ABSTRACT

This paper argues that between 1969 and 1976 US policy-makers actively sought to transcend nuclear parity. The Nixon and Ford administrations demonstrated increasing uneasiness toward nuclear parity and yet, proved unwilling to match the Soviet Union quantitatively. In the search for an answer to the question of what strategic superiority was in the age of parity, they came to understand it in distinctly qualitative terms, adopting a number of decisions related to nuclear planning, intelligence analysis of the nuclear balance, and nuclear weapons innovation and modernization, aimed at securing a qualitative edge over the USSR.     

Peace for Atoms. US Non-Proliferation Policy and the Romanian Role in the Sino-American Rapprochement, 1969–1971

ABSTRACT

By 1970, the United States had undergone a remarkable volte-face on dealing with People's Republic of China as a nuclear weapon state, from outspoken opposition to political recognition. Aware of the importance of co-opting Beijing in the emerging multipolar order, President Richard Nixon sought any possible opening to the Chinese leadership. One secret backchannel passed through Bucharest, whom Washington rewarded with sensitive atomic assistance for its good offices. If in the mid-1960s dealing with China was regarded as detrimental to the cause of non-proliferation, by the early 1970s, the United States relaxed its nuclear exports policy towards useful adversaries, such as Romania, all in pursuit of geopolitical interests.     

Pakistan,Uranium and the International Atomic Energy Agency, 1970–1980

ABSTRACT

This article explores how the International Atomic Energy Agency (IAEA) assisted Pakistan with exploring the front end of the fuel cycle. Drawing on new primary sources gathered from extensive fieldwork in Pakistan as well as the IAEA's archives, this article sheds new light on the changing direction and performance of the Pakistani nuclear program during the 1970s, focusing on the exploration of uranium. The analysis highlights the competing priorities faced by the IAEA at this time – specifically, how to handle the increasingly politicized balance between technology diffusion and non-proliferation – and how this affected the Agency's support for the nuclear program in Pakistan, as the program was secretly shifting away from nuclear energy toward a weapons project.     

论尼赫鲁政府的和平核政策

在先经济后国防的发展战略以及尼赫鲁反核伦理思想的指导下，从1947年8月到1964年5月，尼赫鲁政府奉行和平核政策，坚持和平利用核能，反对发展核武器；鼓吹核裁军，主张全面禁止核试验；着眼经济建设大局，加强核基础设施建设。1962年印度发动对华战争及其惨败，预示着扩张权势、增强防务的努力开始逐步取代经济优先的基本国策，尼赫鲁的反核伦理思想和核权威主义开始动摇，对华战争后关于核问题的公开辩论说明尼赫鲁和平核政策开始受到冲击，印度核政策的变革即将随着尼赫鲁时代的结束而到来。     

New insights into the consumption of maize and other food plants in the pre-Columbian Caribbean from starch grains trapped in human dental calculus

In a first region wide study, starch grains from human dental calculus from the pre-Columbian insular Caribbean (dating to ca. 350 B.C.–A.D. 1600) are used to identify important plant foods in the diet and to assess potential dietary differences related to age or sex. Results give important insights into pre-Columbian maize (Zea mays) consumption throughout the region, confirming recent studies that indicate that maize was more commonly consumed in the insular Caribbean than originally thought. No age or sex based differences in maize consumption were found. Furthermore, based on the results of new experiments regarding grinding and pressure damage to starch grains, it is clear that maize in the Caribbean was ground, baked and consumed as bread as was the case in large parts of the mainland. Based on our results we tentatively suggest maize consumption in the Caribbean was at least in some cases associated with feasting and ceremonial activities. The variety in other plant foods identified (mostly tuberous root crops) shows that the pre-Columbian inhabitants of the region consumed a broad spectrum, but locally variable diet in which a variety of root crops functioned as staple crops, including marunguey (Zamia sp.) and sweet potato (Ipomoea batatas). We found no indications for the traditionally assumed heavy reliance on manioc (Manihot esculenta) cultivation in the region.     

Macrobotanical food remains from a trans-Holocene sequence at Daisy Cave (CA-SMI-261), San Miguel Island, California

Carbonized macrobotanical remains from a trans-Holocene archaeological and paleontological sequence at Daisy Cave provide important insights into the use of food plants by Paleocoastal people as well as later groups on California’s Northern Channel Islands. Small seeds are rare among the macrobotanical remains recovered in the cultural strata at Daisy Cave, which are dominated by charcoal from woody plants used as fuel. The recovery of Brodiaea-type corms from the Early and Late Holocene strata suggests, however, that geophytes were an important source of carbohydrates and calories for Channel Islanders throughout the Holocene. The proposed importance of geophytes is consistent with the abundance of Brodiaea in island vegetation communities recovering from more than a century of overgrazing, as well as the large numbers of digging stick weights found in island sites.     

Images of the third world: teaching a geography of the third world

Abstract

This paper focuses on how to teach undergraduate students to analyse critically various received images of the Third World. This is achieved through the use of a detailed practical exercise which is based on poster, newspaper and map representation of the Third World. The concepts of identity, positionality and representation are reviewed and there is a discussion of how an awareness of these concepts should help students understand the influencing power of stereotypical images of distant others.     

People,plants and performance: On actor network theory and the material pleasures of the private garden

Actor network theory has received considerable attention within geography. In this paper I suggest that geographers have looked at these ideas in a particular way and that this can be productively complemented by an excursion into the contemporary private garden. Through exploring the ways in which people and plants live together there, some geographical criticisms of a defined actor network theory no longer seem to necessarily apply to a more diffuse set of actor network ideas. Furthermore, these ideas can also provide a productive means of engaging practically with the material presence of things, insofar as this materiality is important in the constitution of human cultural experience.