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On the unity of cytomembrane system in the skeletal muscle 总被引:1,自引:0,他引:1
I Diculescu 《Morphologie et embryologie》1980,26(3):205-212
In situ cytochemical evidence for specific Ca-binding sites in the cytomembrane system of skeletal muscle fibers is reported. High Ca accumulation was found at the junctions between different types of cytomembranes. Such junctions might represent "gate-locks' for intracellular Ca movements. Openings of sarcoplasmic reticulum (SR) in frog muscle fibers and of T-tubules in rat muscle fibers are described. Coated and noncoated caveolae were found in rat muscle fibers. The same positive reaction for TPP-ase was found in trans-Golgi zone, terminal cisternae and subsarcolemmal cisternae. These results suggest the membrane continuity and ontogenetic relationships in the cytomembrane system of skeletal muscle fibers. 相似文献
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Ken Liberman 《Dialectical Anthropology》1978,3(2):157-176
Conclusion Nevertheless, in the remote parts of the Western Desert the Aboriginal people remain Aboriginal in thought and experience. They exploit the advantages which the Euraustralians offer, while remaining committed to their way of life. European-Australians water their trees, carry water to the camps, collect the Aboriginals' firewood, repair their automobiles, cook meals for the children and old people, and clean the few Aboriginal houses which exist; their wages are paid by the Australian government.If anything, strategic contact with European civilization has increased the amount of time available for traditional Aboriginal ceremonies, as well as the number of Aboriginals who can transport themselves to the ceremonies. Euraustralian residents are outraged about the amount of time Aboriginals spend corroborreein'. The Secretary of the West Swan Progress Association, a Euraustralian community group. claims that the Aboriginals are becoming a law unto themselves, and this offends the moral-legalistic sense of order which Euraustralians assert in their cultural political struggle with Aboriginals. Today, the cultural politics is being carried on with renewed vigor, and the outcome is by no means certain.A Catholic missionary, at the end of his career with Aboriginals made perhaps the most astute comment I have heard about the Aboriginal undergoing modernization.Ken Liberman has been the Western Desert Research Officer for the Western Australian Museum for the past two years. Currently, he and his wife, Ms A.Z. Parker, are community organizers employed by the Aboriginal Council at Docker River, Northern Territory, Australia. 相似文献
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von Cramon-Taubadel N Pinhasi R 《Proceedings. Biological sciences / The Royal Society》2011,278(1720):2874-2880
The extent to which the transition to agriculture in Europe was the result of biological (demic) diffusion from the Near East or the adoption of farming practices by indigenous hunter-gatherers is subject to continuing debate. Thus far, archaeological study and the analysis of modern and ancient European DNA have yielded inconclusive results regarding these hypotheses. Here we test these ideas using an extensive craniometric dataset representing 30 hunter-gatherer and farming populations. Pairwise population craniometric distance was compared with temporally controlled geographical models representing evolutionary hypotheses of biological and cultural transmission. The results show that, following the physical dispersal of Near Eastern/Anatolian farmers into central Europe, two biological lineages were established with limited gene flow between them. Farming communities spread across Europe, while hunter-gatherer communities located in outlying geographical regions adopted some cultural elements from the farmers. Therefore, the transition to farming in Europe did not involve the complete replacement of indigenous hunter-gatherer populations despite significant gene flow from the Southwest Asia. This study suggests that a mosaic process of dispersal of farmers and their ideas was operating in outlying regions of Europe, thereby reconciling previously conflicting results obtained from genetic and archaeological studies. 相似文献
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Dekkers CP 《TheScientificWorldJournal》2001,1(Z2):958-967
Emission trading is a new instrument in environmental policy. It is an alien notion in most European countries and it is often viewed with hesitation. The paper discusses the economic, legal, and perhaps more importantly, the cultural aspects to consider when one tries to explore the prospects for trading emissions of NOx and other substances in Europe. Issues to be addressed are the present legal framework in Europe in relation to the national emission ceilings on NOx and other substances on the basis of relevant EU directives and UNECE protocols. The paper will discuss the extent to which the legal framework within the EU imposes constraints on the design of a national emission trading scheme, and what options are available to fit emission trading into that legislative structure. The NOx emission trading programme developed in the Netherlands will be used to demonstrate the various aspects in a European context. 相似文献
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MOTIVATION: The discovery of new protein folds is a relatively rare occurrence even as the rate of protein structure determination increases. This rarity reinforces the concept of folds as reusable units of structure and function shared by diverse proteins. If the folding mechanism of proteins is largely determined by their topology, then the folding pathways of members of existing folds could encompass the full set used by globular protein domains. RESULTS: We have used recent versions of three common protein domain dictionaries (SCOP, CATH and Dali) to generate a consensus domain dictionary (CDD). Surprisingly, 40% of the metafolds in the CDD are not composed of autonomous structural domains, i.e. they are not plausible independent folding units. This finding has serious ramifications for bioinformatics studies mining these domain dictionaries for globular protein properties. However, our main purpose in deriving this CDD was to generate an updated CDD to choose targets for MD simulation as part of our dynameomics effort, which aims to simulate the native and unfolding pathways of representatives of all globular protein consensus folds (metafolds). Consequently, we also compiled a list of representative protein targets of each metafold in the CDD. Availability and implementation: This domain dictionary is available at www.dynameomics.org. 相似文献
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Francisco Palomares J. V. López-Bao G. Telletxea J. C. Ceña P. Fournier G. Giralda F. Urra 《European Journal of Wildlife Research》2017,63(5):78
The European mink is a critically endangered mustelid species of conservation concern throughout Europe. Several conservation interventions have been implemented in recent years, supported by both national and European governments. However, knowledge about the natural history of the European mink is scarce and localized to a few specific areas. From 2007 to 2009, we studied mink activity patterns, home range sizes, and macrohabitats of mink home ranges based on 28 radio-tracked European mink (10 adult females, 11 adult males, 3 young females, and 4 young males) in the Foral Community of Navarre (northern Spain), in the Arga and Aragón rivers. We also provide insights on the spatial organization of the species. European mink presented a stable, mainly nocturnal and crepuscular activity pattern and required between 15 and 75 ha of fluvial habitats to establish their home ranges, which were also quite stable throughout the year. There were great differences between adult females and adult males, the latter having home ranges five times larger. In addition, whereas adult females mainly settled in lagoons and small tributaries, males also used to a large extent the main river sections. European mink presented a polygynous mating system, where males were territorial and encompassed several female home ranges within their home ranges. Lagoons and similar structures should be preserved and favored in management strategies, and tributaries maintained in good condition, as female requirements should be prioritized in plans to improve the general habitat quality for the species. Any conservation plan aimed at the improvement or recovery of European mink populations through habitat management should consider management blocks of at least 15 ha per each potential breeding female. 相似文献
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Doddoli R 《Biomolecular engineering》2002,19(2-6):37-41
When a scientist wants to set up and co-ordinate a Research and Technical Development (RTD) project for the first time, he is confronted with a certain number of factors, which, generally, are completely unknown. To co-ordinate a research project, it is not sufficient to have, as starting point, a set of interesting and innovative scientific themes. In fact, after the first preparatory steps, he is confronted with a number of difficulties such as the sinking of the project before it is put forward for financing. The different visions from the scientific and industrial partners are sometimes completely opposite (4): so it is necessary to understand and to assess the requirements of every participant. The industrial partner approach is, for example, linked to this assessment, bearing in mind that his involvement is indispensable for the viability of the project. First of all, this work aims to warn scientists who wish to start up in such an adventure, and secondly serve as a 'vademecum for the co-ordinator' in order to achieve successful completion of work that requires big investments in energy and time. 相似文献
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民族植物学—社会及文化价值初探 总被引:11,自引:0,他引:11
简要介绍民族植物学的性质、研究现况及其在经济、生态、环境和学术上的应用情况。民族植物学的社会价值通过其在增强民族自信心、伦理学和知识产权等方面的作用得以论证。民族植物学的文化价值具体而生动,体现于种种直接的植物文化现象(如植物礼仪文化、食花文化、树叶信、草药文化等)和宗教行为(如植物图腾、树神崇拜、神林崇拜等)。通过对民族植物学的经济、生态价值和社会、文化价值的分析,作者相信,民族植物学对于文化多样性和生物多样性的保护将起到积极的作用。 相似文献
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It is often assumed that parent-to-child cultural transmission leads to similarities and differences among groups evolving through descent with modification (“phylogenesis”). Similarly, cultural transmission between peers, and between adults and children who are not their offspring, is widely believed to result in groups exchanging cultural traits (“ethnogenesis”). However, neither of these assumptions has been examined empirically. Here, we test them using ethnographic data on craft learning in Iranian tribal populations and the cladistic method of phylogenetic analysis. We find that parent-to-child transmission dominates learning during childhood, but the other two forms of interindividual transmission become more important in later periods. The latter do not, however, appear to have resulted in extensive exchange of cultural traits among tribes. Instead we find that most of the variation among the tribes' craft assemblages can be explained by descent with modification. This can be accounted for by the fact that weavers usually only share their knowledge with members of their own tribe and are prevented from interacting with women from other groups by social norms. These findings demonstrate that the relationship between processes of cultural evolution at the level of the individual and processes of cultural evolution at the level of the group is more complex than is usually acknowledged, and highlight the need for more integrated studies of the processes operating at both scales. 相似文献
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Douglas R. Holmes 《American anthropologist》2003,105(2):464-466
Building Europe: The Cultural Politics of European Integration. Cris Shore. New York: Routledge, 2000. 258 pp. 相似文献