首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 15 毫秒
1.
This article presents information on the rape of women in the former Yugoslavia, focusing more on Muslim women in Bosnia-Herzegovina, and examines the evolutionary, sociological, psychological, and feminist theories of this form of sexual violence. Using a case study approach, through documentation from newspapers and other media accounts, this paper investigated the sexual violence that featured strongly in the campaign of ethnic cleansing or genocide of Muslims in Bosnia-Herzegovina. It was noted that the variables of power, sex, and aggression in the context of war seem to be linked. This is particularly evident when authority legitimates sexual aggression. Without the backing of authority, some rape is expected, but not of such proportion or brutality. In terms of the theories, the evolutionary perspective appears to have limited applicability in explaining rape as an act of war. However, the feminist and macrosociological multivariate theories that focus on heterogeneity of the population, a cultural foundation of very traditional gender roles, and a historical tradition that legitimates sexual violence by armies in war-time, provide more persuasive insights.  相似文献   

2.
3.
One of the concerns surrounding the import (for food and feed uses or processing) of genetically modified herbicide tolerant (GMHT) oilseed rape is that, through seed spillage, the herbicide tolerance (HT) trait will escape into agricultural or semi-natural habitats, causing environmental or economic problems. Based on these concerns, three EU countries have invoked national safeguard clauses to ban the marketing of specific GMHT oilseed rape events on their territory. However, the scientific basis for the environmental and economic concerns posed by feral GMHT oilseed rape resulting from seed import spills is debatable. While oilseed rape has characteristics such as secondary dormancy and small seed size that enable it to persist and be redistributed in the landscape, the presence of ferals is not in itself an environmental or economic problem. Crucially, feral oilseed rape has not become invasive outside cultivated and ruderal habitats, and HT traits are not likely to result in increased invasiveness. Feral GMHT oilseed rape has the potential to introduce HT traits to volunteer weeds in agricultural fields, but would only be amplified if the herbicides to which HT volunteers are tolerant were used routinely in the field. However, this worst-case scenario is most unlikely, as seed import spills are mostly confined to port areas. Economic concerns revolve around the potential for feral GMHT oilseed rape to contribute to GM admixtures in non-GM crops. Since feral plants derived from cultivation (as distinct from import) occur at too low a frequency to affect the coexistence threshold of 0.9% in the EU, it can be concluded that feral GMHT plants resulting from seed import spills will have little relevance as a potential source of pollen or seed for GM admixture. This paper concludes that feral oilseed rape in Europe should not be routinely managed, and certainly not in semi-natural habitats, as the benefits of such action would not outweigh the negative effects of management.  相似文献   

4.
Many species maintain territories, but the degree of overlap between territories and the level of aggression displayed in territorial conflicts can vary widely, even within species. Greater territorial overlap may occur when neighboring territory holders are close relatives. Animals may also differentiate neighbors from strangers, with more familiar neighbors eliciting less‐aggressive responses during territorial conflicts (the “dear enemy” effect). However, research is lacking in how both kinship and overlap affect territorial conflicts, especially in group‐living species. Here, we investigate kinship, territorial overlap, and territorial conflict in a habituated wild population of group‐living cooperatively breeding birds, the southern pied babbler Turdoides bicolor. We find that close kin neighbors are beneficial. Territories overlap more when neighboring groups are close kin, and these larger overlaps with kin confer larger territories (an effect not seen for overlaps with unrelated groups). Overall, territorial conflict is costly, causing significant decreases in body mass, but conflicts with kin are shorter than those conducted with nonkin. Conflicts with more familiar unrelated neighbors are also shorter, indicating these neighbors are “dear enemies.” However, kinship modulates the “dear enemy” effect; even when kin are encountered less frequently, kin elicit less‐aggressive responses, similar to the “dear enemy” effect. Kin selection appears to be a main influence on territorial behavior in this species. Groups derive kin‐selected benefits from decreased conflicts and maintain larger territories when overlapping with kin, though not when overlapping with nonkin. More generally, it is possible that kinship extends the “dear enemy” effect in animal societies.  相似文献   

5.
采用室内培养皿生物测定的方法,测试不同质量浓度(0、0.02、0.03、0.05、0.08、0.10 g·mL-1)麦秸、稻秸浸提液对油菜及油菜田2种常见靶标杂草野燕麦(Avena fatua Linn)、播娘蒿 [Descurainia sophia(L.)Schur]种子萌发及幼苗生长的影响。结果表明,在供试质量浓度下,麦秸与稻秸浸提液对3种受体材料种苗生长的影响存在显著差异,二者对油菜种苗生长安全的最高质量浓度分别为0.08 g·mL-1和0.05 g·mL-1,可以用来开发研制油菜田肥料;在对油菜安全的质量浓度下,麦秸浸提液对野燕麦种苗生长无抑制作用;而稻秸浸提液对野燕麦种苗生长的抑制作用明显,可以用来开发研制油菜田防除野燕麦的生物抑草肥;在油菜的安全的质量浓度下,麦秸、稻秸浸提液对播娘蒿种苗生长均有很强的抑制作用,且麦秸的抑制作用强于稻秸,具有开发研制油菜田治理播娘蒿的生物抑草肥料的应用前景。  相似文献   

6.
Amongst the Gush of southwestern Kenya instances of rape are frequently reported; this was true also in the colonial period and yet it seems that those cases which come to the notice of the authorities are few compared with the numbers which actually occur. While certain features of the traditional culture seem to have encouraged violent sexual assault, because in a patrilocal society miscreants are likely to victimize their relatives, that is women who are sexually taboo, the crime is considered a sacrilegious matter to be dealt with in the family, not by the secular authorities. Given the sacrilegious nature of the act the Gush are convinced that such behavior is involuntary and that the criminal is not a criminal but an afflicted person, motivated by the malevolence of the ancestral spirits or of jealous neighbors and kin. The author uses case material to illustrate various aspects of the Gush belief system in regard to criminal behavior in general and rape in particular.  相似文献   

7.
This article explores the concepts of borders and boundaries in the formation of an Eritrean national identity. The dialectical relationship between the State of Eritrea and its borders towards the Sudan and Ethiopia are addressed in order to analyse how this relationship influences the formation of a 'formal' national identity. The cultural, political, religious and historical configuration of the Eritrean frontiers makes it difficult to demarcate a particular Eritrean identity, distinguishing it from Sudanese ethnic and religious identities or historical-politico and ethnic Ethiopian identities. The Eritrean border conflicts with the Sudan and Ethiopia are used as empirical cases to show how state violence through the mobilization of the multi-ethnic national army is employed in order to manifest a significant other that the 'formal' Eritrean national identity may be contrasted against. The article concludes that the Eritrean boundaries of identity and borders of territory are still in the making, and what they will eventually embrace and contain remains to be seen.  相似文献   

8.
In Brazil, abortion is only allowed in cases of rape, serious risk to a woman's life or fetal anecephaly. Legal abortion services cover less than 4% of the Brazilian territory and only 1,800 procedures are performed, in average, per year. During the COVID-19 pandemic, almost half of the already few Brazilian abortion clinics shut down and women had to travel even longer distances, reaching abortion services at later gestational ages. In this paper, we describe three bottom-up advocacy strategies that emerged from difficulties deepened during the COVID-19 pandemic at a single abortion service in Brazil, amidst anti-gender policies from the federal government. Telemedicine abortion, outpatient surgical abortion and the provision of abortion after 20 weeks' gestation are important strategies that may reduce inequalities that impact the most vulnerable populations, such as black and indigenous women, children, adolescents and women experiencing domestic violence.  相似文献   

9.
当前我国医患关系呈现为整体和谐、局部矛盾尖锐的态势,局部矛盾体现在暴力伤医事件频频发生。在缓解局部矛盾的过程中,医学生作为青年学生,面对恶性暴力事件带来的冲击时心理生理都会受到很大影响。同时,医学生作为未来医生又直接关系到未来医患关系的构建,因此,如何在当前特殊形势下避免医患矛盾给医学生带来不良影响,加强医学生德育教育的有效性,成为医学生德育教育的重点和难点。本文通过分析医患矛盾成因,对医学生德育教育的影响以及对策来探讨和研究,希望为构建和谐医患关系和医学生德育教育方面提供新的解决思路。  相似文献   

10.
For several years, several wild species are experiencing a comeback in Europe, especially large herbivores. Despite the good news, the increased number of wild herbivores also potentially increases human-wildlife conflicts due to crop damages and road traffic accidents where such species have been involved in previously. In this context, studying the movements of animal groups is particularly relevant for managing their use of space and ensure sufficient cohabitation with human populations. We thus studied the European bison (Bison bonasus), a species concerned in several rewilding programs, to understand to what extent individual characteristics and social relationships are involved in the leadership process and how these factors influence the success of group movements. We observed a herd of 14 individuals in Zuid-Kennemerland National Park (the Netherlands) and analysed the initiation phase of spontaneous group movements. We showed that leadership was distributed throughout the group but the two oldest females showed higher propensity to initiate and to be followed. They seemed to have a high social power and a strong capacity to federate probably due to their dominance rank and their knowledge of the areas. The joining process was faster when animals were grouped before departure and when the initiator moved in the direction towards which the majority of individuals was oriented. Individuals joined the movement according to a selective mimetic process, based on kinship. These results, combined with virtual fence device, could be used to manage herd movements in a given territory and thus, might be an innovative tool to decrease human-wildlife conflicts.  相似文献   

11.
The reduction of atmospheric sulphur dioxide pollution is causing increasing problems of sulphur deficiency in sulphur‐demanding crop plants in northern Europe. Elemental sulphur and many sulphur containing compounds such as cysteine‐rich antifungal proteins, glucosinolates (GSL) and phytoalexins play important roles in plant disease resistance. The aim of this work was to analyse the effect of inadequate sulphur supply on disease resistance of oilseed rape (Brassica napus). Compared with fertilized oilseed rape, healthy looking S‐deficient plants showed increased susceptibility to the blackleg fungus Leptosphaeria maculans, to the generalist necrotroph Botrytis cinerea and to the oomycete Phytophthora brassicae. To analyse possible causes of the increased disease susceptibility of S‐deficient plants, protein extracts and methanolic extracts of secondary metabolites of plants grown with and without adequate sulphur supply were tested for antimicrobial activity. None of the protein extracts showed antimicrobial activity. However, extracts containing secondary metabolites from normally grown plants showed a strong antimicrobial activity in in vitro tests with various fungal and bacterial pathogens. This activity was almost totally lost in extracts derived from S‐deficient plants. The antimicrobial activity did not appear to be based on the activity of phytoalexins because it was present in healthy plants and was not increased by a previous inoculation with Botrytis cinerea. The loss of antifungal activity in S‐deficient plants correlated with a strong reduction of various GSL, thus suggesting a reduced level of GSL as a possible cause of the reduced antimicrobial potential. However, limited tests of commercially available GSL or their degradation products did not demonstrate a causal link. Our results show that S‐deficiency of oilseed rape negatively affects disease resistance and suggest that this effect is at least partially caused by a reduction of sulphur‐dependent phytoanticipins.  相似文献   

12.
A new role for protein self-association in the cell is discussed. An argument is advanced that when cellular protein is in its associated state the excluded volume component of the solution is minimized. Conversely, when cellular protein is in its dissociated state the excluded volume component of the solution is maximized. For proteins that make up a substantial fraction of the intracellular protein concentration, control of the self-association event thus presents itself as a means of regulating cellular processes that are influenced by different levels of volume exclusion. In this communication we examine how the control of protein association/dissociation might influence one such important process, namely the folding of a protein to a compact state.  相似文献   

13.
Diacylglycerol acyltransferase (EC 2.3.1.20) activity was assayed during the maturation of seeds of oilseed rape (Brassica napus L.) and safflower (Carthamus tinctorius L.). Developmental studies were also conducted with microspore-derived embryos of oilseed rape (B. napus L. cv Topas) and an embryogenic microspore-derived cell-suspension culture of winter oilseed rape (B. napus L. cv Jet Neuf). In the maturing seeds, diacylglycerol acyltransferase activity increased to a maximum during rapid accumulation of lipid and declined, thereafter, with seed maturity. In microspore-derived embryos of oilseed rape (cv Topas), high levels of diacylglycerol acyltransferase activity were found throughout the early torpedo to late cotyledonary developmental stages with maximum enzyme specific activity associated with the mid-cotyledonary developmental stage. The cell-suspension culture of winter oilseed rape (cv Jet Neuf) contained 3 to 4% triacylglycerol on a dry weight basis and represented about half of the total lipid. The fatty acid profile of total lipid and triacylglycerol in the cell-suspension culture was similar in samples taken during a 1-year period. The Jet Neuf culture contained diacylglycerol acyltransferase with specific activity similar to that of Topas microspore-derived embryos. Jet Neuf diacylglycerol acyltransferase also displayed an enhanced specificity for erucoyl-CoA over oleoyl-CoA when assayed with 14 [mu]M acyl-coenzyme A in the reaction mixture. The specific activity of diacylglycerol acyltransferase in homogenates prepared from the Jet Neuf culture ranged from 5 to 15 pmol of triacylglycerol min-1 mg-1 of protein when assayed at intervals during a period of 1 year. Thus, the cell-suspension culture may represent an attractive tissue source for purification and characterization of triacyl-glycerol biosynthetic enzymes.  相似文献   

14.
Recent theory in social evolution has been mainly concerned with competition and cooperation within social groups of animals and their impact on the stability of those groups. Much less attention has been paid to conflicts arising as a result of solitary floaters (outsiders) attempting to join groups of established residents (insiders). We model such conflicts over group‐membership using a demographically explicit approach in which the rates of births and deaths in a population determine the availability of group‐vacancies and the number of floaters competing over these vacancies. We find that the outcome of within‐group competition, reflected in the partitioning of reproduction among group members, exerts surprisingly little influence on the resolution of insider‐outsider conflict. The outcome of such conflict is also largely unaffected by differences in resource holding potential between insiders and outsiders. By contrast, whether or not groups form is mainly determined by demographic factors (variation in vital rates such as fecundity and mortality) and the resulting population dynamics. In particular, at high floater densities territory defense becomes too costly, and groups form because insiders give in to the intruder pressure imposed on them by outsiders. We emphasize the importance of insider‐outsider conflicts in social evolution theory and highlight avenues for future research.  相似文献   

15.
Sexual violence within as well as outside sexual relationships has far-reaching public health and human rights implications and is a continuing focus of popular debate, media coverage, and research in postapartheid South Africa. Partly because it has been shown to affect individual vulnerability to HIV/AIDS, sexual violence has in recent years become framed as a global public health issue. International research efforts to document the scale of this personally and politically sensitive problem can encounter conceptual, definitional, and methodological difficulties that anthropology is well placed to assist in alleviating. This article offers an ethnographic exploration of the spectrum of practices relating to sexual coercion and rape among young people in a township in the former Transkei region of South Africa. Contextualizing meanings of sexual coercion within local youth sexual culture, the article considers two emic categories associated with sex that is "forced": ukulala ngekani: "to sleep with by force" or ukunyanzela: "to force," both usually used to describe episodes occurring within sexual partnerships; and ukudlwengula, used to describe rape by a nonpartner or stranger. The article discusses the semantic content of and differences between these two key categories, demonstrating that encounters described as "forced sex" encompass not only various forms of sexual coercion but also, particularly in the narratives of young men, instances of more consensual sex. Of importance, in turn, in defining an act as "rape" rather than as "forced sex" are the character of the relationship between the two parties and interlinked ideas relating to exchange and sexual entitlement, love, and the importance of "intention," violation, and "deserving" victimhood.  相似文献   

16.
德国近年来油菜高油酸育种的一些情况,其中包括高油酸育种的意义,育种方法,高油酸突变体的遗传特点,高油酸-低亚麻酸育种的可能性和高油酸油菜的应用前景等,对于我国育种新技术的改进、改良和创新研究有一定的意义.  相似文献   

17.
Germinating seeds with the highest specific activity (24 hour germination) were used for isolation of alcohol dehydrogenase, ADH, from rape (Brassica napus L. cv. T?ebi?ská). The rape ADH was purified by fractionation with ammonium sulphate, desalting on Sephadex G 25, chromatography on DEAE cellulose and gel filtration on Sephadex G 150. Using this isolation procedure, enzyme with a specific activity 85.6 times higher than that of the crude extract was obtained. The molecular weight of the enzyme obtained is 66.000. The enzyme is a metallo-enzyme containing sulfhydryl groups as evidence by the inhibitory effect of chelating compounds and thiol reagents. The optimum pH for the oxidation of ethanol is 8.5 and for reduction of acetaldehyde 7.0. The enzyme exhibits a relatively wide substrate specificity towards alcohols. Dimethyl-sulphoxide (DMSO), some amides and oximes and some intermediates of the carbohydrate metabolism act as ADH inhibitors, ATP as analogue of NAD also exhibits an inhibitory effect. The inhibitory effect of heterocyclic substances (pyrazol, imidazol, pyridine) is similar to the effect on liver alcohol dehydrogenase.  相似文献   

18.
Territorial behaviour can only be adaptive if its costs are outweighed by its benefits. Territorial individuals incur costs by defending their territories against intruders. Usually these intruders are assumed to be non-territorial floaters attempting to take over the whole territory or neighbours trying to extend the borders of their own territory. We instead investigate how costs and benefits of territorial behaviour are affected by neighbours which invade to steal resources on a territory.We show analytically that in the absence of defence intrusion into neighbouring territories always pays and that even if territories are defended intrusion levels can still be high. Using a more detailed simulation model we find that territory defence usually disappears from the population even if owners have a strong advantage over intruders in terms of fighting costs or foraging efficiency. Defence and thus territoriality can only be evolutionarily stable if fighting costs for the intruder relative to the productivity of the territory are very high or if crossing the borders between territories carries additional costs.Our results show that stealing of resources by neighbours can have a considerable effect on the evolutionary stability of territory defence and thus territoriality itself. A more mechanistic model of territorial behaviour is needed to incorporate these kinds of mechanisms into a general theory on the evolution of territoriality.  相似文献   

19.
To determine whether bacteria isolated from within plant tissue can have plant growth-promotion potential and provide biological control against soilborne diseases, seeds and young plants of oilseed rape (Brassica napus L. cv. Casino) and tomato (Lycopersicon lycopersicum L. cv. Dansk export) were inoculated with individual bacterial isolates or mixtures of bacteria that originated from symptomless oilseed rape, wild and cultivated. They were isolated after surface sterilization of living roots and stems. The effects of these isolates on plant growth and soilborne diseases for oilseed rape and tomato were evaluated in greenhouse experiments. We found isolates that not only significantly improved seed germination, seedling length, and plant growth of oilseed rape and tomato but also, when used for seed treatment, significantly reduced disease symptoms caused by their vascular wilt pathogens Verticillium dahliae Kleb and Fusarium oxysporum f. sp. lycopersici (Sacc.), respectively.  相似文献   

20.
Resource holding power (RHP), as expressed by gaining dominance, can be affected by extrinsic and intrinsic factors. Extrinsic factors that increase the RHP include e.g. prior exposure to the contest area. The pay-off asymmetry hypothesis was tested according to which there is an asymmetry in the value the resident's territory has for the resident and intruders, i.e. the resident loses more than intruder opponents when losing the contest over a territory in which it has invested much energy during the exploration of food and shelter resources, during the settlement of conflicts with territorial neighbours, etc. This asymmetry will increase the resident's chance to win the fight over intruders. If the resident-intruder asymmetry is enhanced by presenting resource-rich territories to e.g. fish (structurally diverse or 'rich' aquariums), the hypothesis predicts that the resident's dominance chance (probability to win the fight) will be higher than in structurally 'poor' aquariums. It was found that residents were proportionately more often dominant (fight winners) than intruders in the rich compared to the poor aquariums in all seven tested fish species. This demonstrates that a high territory resource value (aquarium enrichment) significantly facilitates the expression of the resident's dominance advantage (prior residence effect). In contrast to dominance, aggressive behaviour before the dominance settlement did not generally differ between residents and intruders when compared in rich and poor aquariums. This suggests that dominance in itself and aggression prior to dominance settlement are at least partially guided by different motivational systems.  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号