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1.
This paper contributes to the literature on how perceived discrimination influences the impact of intergroup contact among ethnic minority members. Previous research has shown that perceived group discrimination inhibits the positive outcomes of intergroup contact among ethnic minority members. In extension, this paper examines whether perceived personal discrimination has a similar negative impact as a boundary condition of the contact–prejudice relationship among ethnic minority members. Analyses expand previous intergroup contact research by showing that the impact of intergroup contact is uniform across various levels of perceived personal discrimination. This finding suggests that the otherwise harmful consequences of perceived personal discrimination can be effectively counterbalanced by positive contact experiences among ethnic minority members. Analyses use evidence from a national probability sample, which was fielded in 2006 to examine some of the largest ethnic minority groups (N?=?3,462). The concluding section discusses the theoretical implications of the empirical findings.  相似文献   

2.
Abstract

A comparison of intra‐ and inter‐ethnic divorce rates in Hawaii showed that inter‐ethnic marriages resulted in a higher proportion of divorces than did intra‐ethnic marriages when the marriage data used had to do with all marriages occurring in Hawaii. However, a sizeable portion of marriages in Hawaii are of nonresidents who, if they divorce, probably divorce elsewhere. Nonresident marriages are chiefly intra‐ethnic marriages of Caucasians. When examining the proportions of divorces to resident marriages, within‐group marriages are more at risk than inter‐ethnic marriages. As in prior research, persons who marry members of other racial/ethnic groups tend to marry persons from groups with income levels similar to their own. As in previous reports, some cross‐ethnic combinations appeared more at risk for divorce than did others. Group income appeared to be a predictor of risk. When considering only resident marriages as related to divorces, those marriages in which the bride was from a higher income group than the groom were at a significantly greater risk for divorce than marriage in which the bride came from an income group lower than that of the groom.  相似文献   

3.
The Middle‐Upper Tournaisian boundary broadly correlating with the Kinderhookian‐Osagean boundary in North America represents a level of a conspicuous lithological as well as biotic change. The decline of Chernyshinella and increased representation of eurythermal and agglutinated forms marks the end of Cherepet evolutionary cycle in calcareous foraminifers. In conodonts the decline of Siphonodella inhabiting the pelagic to hemipelagic dysphotic to aphotic environment accompanied by a widespread dispersal and diversification of nektobenthic gnathodids characterizes the end of the first Tournaisian conodont cycle. A major regression associated with important sedimentological changes marks the boundary between the middle and upper Tournaisian mega‐sequences. The above changes in fauna and lithology seem to be connected with climatic oscillations and accompanying oceanographic changes. They are a part of the broader Upper Devonian‐Lower Carboniferous cyclic scheme which appears to have been modified by a complicated interplay of cyclic and nonrecurring processes.  相似文献   

4.
Survey data on people’s reported attitudes towards ethnic minorities are sometimes used as a proxy for ethnic discrimination. However, there is weak empirical evidence of a link between reported attitudes and discrimination. In this article, we use survey data on people’s attitudes towards ethnic minorities combined with a direct measure of ethnic discrimination from a field experiment in the Swedish housing market to re-examine this policy-relevant issue. We find clear evidence of a link between reported attitudes towards ethnic minorities and the extent of ethnic discrimination: in regions where attitudes are more negative, there is more discrimination, and vice versa. Thus, in contrast to most prior studies, our results suggest that reported attitudes may be a useful predictor of ethnic discrimination.  相似文献   

5.
ABSTRACT

The literature on ethnic entrepreneurship emphasizes the role of ethnicity in facilitating group differences in enterprise based on access to ethnic-based resources. This treatment tends to conflate family-based resources with those of ethnicity. Using a framework derived from intersectionality theory, this qualitative study investigates how two aspects of the household economy, namely household composition and family ideology, shape intra-group differences among fifty middle-class Mexican-origin entrepreneurs. Findings reveal that household class and gender dynamics shape access to three family-based resources that facilitate enterprise: family labour, entrepreneurial capital, and inheritance; differences in entrepreneurial activity between family members exceed in some cases those observed between ethnic groups. This study reveals that intersectional dimensions of identity and collectivity influence entrepreneurial outcomes within ethnic households. This study encourages researchers to consider how multiple and intersecting dimensions of identity combine for a more complete understanding of American enterprise.  相似文献   

6.
This article investigates Los Angeles employers' attitudes towards African American and immigrant Latino low-skill workers. Using 145 in-depth interviews of employers in four industries, I find that a central concern of employers of low-skill jobs is control at the workplace, and employers consequently seek workers whom they perceive as manageable and pliable. As such, the most salient component of employers' attitudes towards African American and immigrant Latino low-skill workers is their perception that the manageability and pliability of workers vary by race, nativity and gender. I also link employers' micro-level attitudes to broader societal level ideologies about race and opportunity. I find that employers' attitudes were embedded within an ideology of individualism, as exemplified by the idea of the 'American Dream', and reflected the growing belief that race-based claims are illegitimate.  相似文献   

7.
Since April last year British hospitals have had to collect data on the ethnic group of every patient. Patients must categorise their own ethnic group using the categories of the 1991 census. Claire Hilton argues that such data collection is unhelpful and will not meet its stated aim of helping to provide equitable access to NHS services for all ethnic groups. Self categorisation is unreliable, and the number of ethnic groups available is inadequate, in particular for the white population. Additional data on the size of each ethnic group in the local population and on rates of illness in particular groups are necessary to assess whether services are being provided equitably. Moreover, ethnicity is a multidimensional concept, and information on patients'' language and cultural and religious practices, as well as their place of origin, is necessary if services are to be culturally sensitive.  相似文献   

8.
Surnames were obtained for the second half of the 20th century from civil and religious marriage registers on fifteen Proven?al-Italian and five Italian villages of Cuneo Province, Italy. To insert in the analysis an outward comparison, surnames from two Italian villages of Turin Province, one parish of Turin, one village of Alessandria Province and one village of Asti Province were also collected. Ethnicity does not seem to be the main factor affecting the present genetic structure of the Proven?al-Italians. They are an open community, and evidence the end of the genetic isolation of the alpine populations.  相似文献   

9.
The concept of “ethno-microbiology” is to understand the indigenous knowledge of the Indian people for production of culturally and organoleptically acceptable fermented foods by natural fermentation. About 1000 types of common, uncommon, rare, exotic and artisan fermented foods and beverages are prepared and consumed in different geographical regions by multi-ethnic communities in India. Indian fermented foods are mostly acidic and some are alkaline, along with various types of alcoholic beverages. A colossal diversity of microorganisms comprising bacteria mostly belongs to phylum Firmicutes, filamentous moulds and enzyme- and alcohol-producing yeasts under phyla Ascomycota and Mucoromycota, and few bacteriophages and archaea have been reported from Indian fermented foods. Some microorganisms associated with fermented foods have functionalities and health promoting benefits. “Ethno-microbiology” of ethnic Indian people has exhibited the proper utilisation of substrates either singly or in combination such as fermented cereal-legume mixture (idli, dosa and dhokla) in South and West India, sticky fermented soybean food (kinema and related foods), fermented perishable leafy vegetable (gundruk and related foods), fermented bamboo shoots (soibum and related foods) and fermented fish (ngari and others) in North East India, and fermented meat and sausage-like products in the Indian Himalayas, fermented coconut beverage (toddy) in coastal regions, and various types of naturally fermented milk products (dahi and related products) in different regions of India. This review has also highlighted the “ethno-microbiology” knowledge of the people involving the consortia of essential microorganisms in traditionally prepared amylolytic starters for production of cereal-based alcoholic beverages. The novelty of this review is the interpretation of ethno-microbiological knowledge innovated by ethnic Indian people on the use of beneficial microorganisms for food fermentation to obtain the desired fermented food products for consumption.  相似文献   

10.
Melanocortin-1 receptor gene variants in four Chinese ethnic populations   总被引:9,自引:0,他引:9  
INTRODUCTIONThe variation in human hall and skin color in~ geographic regions of the world is the result Of differences in two Principal forms Of melanin,the red-yellow phaeomelalilns and the bldebrowneUmelanins, which are present in the epidermallayer of hUman skin and hair[1, 2]. The type ofmelanin Produced is under the control of two genes,identified initially by the mouse mutation, extension and agouti. The eXtension gene is expressedin melanocytes, Producillg the melanocyte stimul…  相似文献   

11.
In this article we discuss how sexuality is linked to national identity, ethnicity and cultural diversity in Norwegian textbooks for 13–16-year-olds. We show how gender equality and gay rights are mobilized as markers of Norwegianness in pedagogic texts and discuss the significance this has for inclusion in Norwegian nationhood. We address how progressive policies concerning gender and sexuality in Norway have been utilized to define Norwegianness in ethnic terms and argue that the texts we have analysed may produce the effect that tolerance towards homosexuality and support for gender equality as political positions are considered necessary for ethnic minority subjects’ acceptance as properly ‘integrated’ Norwegian citizens. In this way, these texts on sexuality may be seen to both construct and control ethnic borders in Norwegian society.  相似文献   

12.
A critical review of all available data on acritarch biostratigraphy and diversity dynamics across the Late Ordovician through the early Silurian, permits a better appreciation of the potential of acritarchs for the recognition of the systemic boundary. This analysis also reveals the response of marine microphytoplankton populations to the Late Ordovician palaeoenvironmental crisis (Hirnantian glaciation). Previous zonal schemes are improved, and an updated acritarch biostratigraphic chart is proposed, plotted against the most recent chronostratigraphic subdivisions. Sections from Anticosti Island (Québec, Canada), Algeria, Morocco, and Estonia preserve the best palynological record for the investigated interval. The present analysis shows that no true mass-extinction event occurred in latest Ordovician times in connection with the well known glacial event. “Pre-glacial” Ashgill acritarch suites are dominated by species of Baltisphaeridium, Multiplicisphaeridium, Ordovicidium, Orthosphaeridium, and netromorph acritarchs. An important proportion of these taxa (excluding Ordovicidium and Orthosphaeridium) survive the onset of glacial conditions in Hirnantian (latest Ordovician) times and continues through the early Silurian. The development of morphological polymorphism appears as a response (a survival strategy?) to the establishment of glacial conditions.In glacial-related sediments of Hirnantian age in North Africa, acritarch assemblages display a burst of relative abundance and intra-specific morphological variability (polymorphism) of long-ranging taxa such as Veryhachium, Multiplicisphaeridium, Dactylofusa, Poikilofusa, and Evittia. The extinction of several species characteristic of Upper to uppermost Ordovician strata occurs near the boundary, in “post-glacial” Ashgill (uppermost Hirnantian). This extinction event is counterbalanced by the almost contemporaneous (within the limits of stratigraphic resolution) appearance of several new taxa showing already a clear “Silurian affinity”, e.g., Tylotopalla, Cymbosphaeridium, and Visbysphaera. This origination event is observable in, and correlatable between the North African, the Bohemian and the Anticosti sections, making it global in extent.The completion of the palynological turnover and the establishment of a diverse Silurian acritarch suite occurs well above the base of the Silurian, during Aeronian times. The strong survival capability of the oceanic plankton through periods of palaeoenvironmental crisis in latest Ordovician times (but also throughout the Phanerozoic) could have played an important role in the post-extinction rebounds of metazoan clades, by assuring the continuity of marine trophic resources to consumers and avoiding irreversible disruptions of the trophic chains.  相似文献   

13.
Following a long period of stability there was substantial ecological disruption in the late Ordovician, accompanied by widespread extinction. The ecological upheaval was spread over a period of time (1 My?) and varied in intensity between different groups.

The greatest change in brachiopod faunas occurred in the tropics, where there were widespread extinctions. In temperate regions the community structure, although disrupted, was not destroyed. The deep shelf associations (Benthic Assemblages 4–5) of the Rawtheyan persisted in an attenuated form into the Hirnantian when they were supplemented by genera of the ”Hirnantia fauna” and then became strongly re‐established in the Llandovery.

Trilobites, in contrast to brachiopods, suffered a worldwide extinction in the late Ashgill. Approximately 40% of trilobite genera became extinct at, or near, the Rawtheyan‐Hirnantian boundary.

Analysis of the distribution of Rawtheyan trilobite and brachiopod genera supports a correlation between geographical distribution and survival. Global range charts for brachiopod and trilobite genera, incorporating ecological and palaeogeographical data, have been compiled for this study.  相似文献   

14.
15.
Zooplankton abundance and community structures were studied in three west Spitsbergen fjords at the beginning of the warm phase, which seem to have entered in 2006. Sampling was conducted in summer 2007 at stations distributed along transects in Hornsund, Isfjorden and Kongsfjorden. Variations in zooplankton standing stocks and community structures (assessing taxonomic diversity and zoogeographical affiliations) were analysed in relation to the environmental variables using multivariate techniques. The hydrographic conditions in Hornsund were influenced by the cold Arctic Water, whereas those in Isfjorden and especially in Kongsfjorden were, to a greater extent, under the influence of the warm Atlantic Water. High abundances of both meroplankton and holoplankton organisms were observed in Kongsfjorden, with high contributions of boreal and ubiquitous species (Calanus finmarchicus and Oithona similis, respectively). In Hornsund at the same time, the zooplankton consisted mainly of boreo-Arctic and Arctic species, the abundances of which were comparable along the West Spitsbergen Shelf. Our results indicate that the difference in hydrography had measurable effects on the zooplankton community in the study area. Furthermore, by comparing regions of contrasting oceanographic conditions, we present evidence as to how the zooplankton structure will change in the Arctic ecosystems if the warming trends continue to operate with the same dynamics. The advection of Atlantic waters to the Arctic seas may lead to changes in zooplankton structure, with increased abundance and contributions of boreal and small ubiquitous species. The ‘warmer Arctic fjords’ scenarios may also induce more rapid development of both holoplankton and meroplankton populations and, consequently, modify the trophic interactions in plankton communities.  相似文献   

16.
Abstract

Ethnic and religious minority identity is a subject of intense public debate and academic scrutiny. While assimilation theories anticipate convergence of identity across the generations, discussions of reactive ethnicity, transnational identification and religious revival suggest that there may be a deepening or shifting of minority identity in the second generation. Yet the empirical evidence in support of these different perspectives is far from conclusive. Drawing on a rich data source for the UK, this paper addresses the question of whether minority ethnic groups in Britain show identity assimilation in the second generation. It concludes that both public and private forms of identification with the majority increase across generations, and minority identities tend to become less salient. This is true across ethnic groups, although there are differences in underlying levels and patterns of identity, reflecting variation in contexts of reception and migration.  相似文献   

17.
18.
Rise of non-classical science during XX century had certain influence upon development of biological taxonomy. Scientific pluralism (especially normative naturalism of Laudan), contrary to positivist and early post-positivist treatments, made taxonomy acknowledged scientific discipline of its own right. The present state of some schools of taxonomy makes it possible to consider them as a part of non-classical science and constituting the non-classical taxonomy. The latter is characterized by the following most important features. Ontological substantiation of both classificatory approaches and particular classifications is requested which invalidates such formal approaches as nominalistic and phenetic (numerical) schools. This substantiation takes a form of content-wise background preferably causal models which include certain axioms and presumptions about taxonomic diversity being studied, together with its causes, and thus define initial conditions of classificatory procedures. From this viewoint, phylogenetic classificatory approach is the most developed part of non-classical taxonomy. The entire taxonomic diversity is structured into several aspects of different levels of generality, each being outlined by a particular consideration aspect. The latter makes personal knowledge constituting an irremovable part of any scientific statement about taxonomic diversity, thus opposition of "objectively" and "subjectively" elaborated classifications becomes vague. Interrelation of various species concepts corresponding to its different consideration aspects is described by uncertainty relation principle. Classificatory algorithms are to be compatible with the conditions of a background model to ensure particular classifications obtained by their means are interpretable within the same model: this is provided by the correspondence principle. Classification is considered as a taxonomic hypothesis, i.e. a conjectural judgement about structure of particular fragment of taxonomic diversity considered within given consideration aspect; wich is to be forwarded and tested according to certain rules. Recognition of different aspects of taxonomic diversity makes it "legal" to elaborate several classifications of equal status, each reflecting a particular aspect of a fixed fragment of that diversity. This viewpoint makes classical ideas of the "ultimate" Natural (whatever might be its definition) or the best reference systems futile. In general, any pretension of an approach to be "the best" in reflecting taxonomic divesrity is contr-productive. Instead, elaboration of particular spectra of complementary classifications becomes the main task of non-classical taxonomy which describes in sum the entire taxonomic diversity. So, not opposition but correct mutual interpretation of such classifications and uniting them into the comprehensive picture of taxonomic diversity become focal points of non-classical taxonomy.  相似文献   

19.
20.
There exists evidence that some fast-swimming shark species may have the ability to bristle their scales during fast swimming. Experimental work using a water tunnel facility has been performed to investigate the flow field over and within a bristled shark skin model submerged within a boundary layer to deduce the possible boundary layer control mechanisms being used by these fast-swimming sharks. Fluorescent dye flow visualization provides evidence of the formation of embedded cavity vortices within the scales. Digital particle image velocimetry (DPIV) data, used to evaluate the cavity vortex formation and boundary layer characteristics close to the surface, indicate increased momentum in the slip layer forming above the scales. This increase in flow velocity close to the shark's skin is indicative of boundary layer control mechanisms leading to separation control and possibly transition delay for the bristled shark skin microgeometry.  相似文献   

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