280 research outputs found
Comparison of Tie Wing Fracture Resistance of Differing Ceramic Brackets
No full textObjective:The aim of this study was to compare the tie wing fracture resistance of 4 different manufacturers’ ceramic brackets currently on the market.Methods:The tie wings of ceramic brackets from 4 manufacturers were tested with 10 samples in each group. The brackets were Ormco Symetri, 3M Clarity, American Radiance Plus, and Dentsply Ovation S. The brackets were mounted and fixed in a universal testing machine. A stainless steel ligature wire was looped around a tie wing and the mean tensile strength was both tested and recorded.Results:There was a significant overall difference in tensile strength among the 4 groups (P < .0001) with the 3M Clarity brackets having the highest MPa. When the groups were compared to each other, they also showed a significant difference in mean tensile strength with the exception being the American Radiance Plus and Ormco Symetri brackets.Conclusion:Test results concluded that the 3M Clarity brackets had the highest resistance to tie wing fracture, while the Dentsply Ovation S brackets had the lowest resistance
The role of the COVID-19 impersonal threat strengthening the associations of right-wing attitudes, nationalism and anti-immigrant sentiments
No full textLiterature showed that the link between right-wing attitudes and ethnocentric attitudes gets stronger under existential threats, but the role exerted by an impersonal threat – as COVID-19 – on right-wing attitudes is still unclear. This study aimed to highlight the role of anxiety exerted by the impersonal COVID-19 threat on the relationship between right-wing attitudes and ethnocentric attitudes, as nationalism and anti-immigrants’ sentiments. As part of an international project to evaluate the impact of COVID-19, this study administered an online survey to a representative sample (n 1038). The anxiety generated by an impersonal threat as COVID-19 – thus not exerted by any outgroup – can moderate the relationship among personal Right-Wing Authoritarianism, social dominance orientation, and ethnocentric attitudes. This is the first study demonstrating that existential threat is effective also when exerted by an impersonal agent (as COVID-19) rather than by an outgroup. Second, these findings disclose useful implications for preventive psychological interventions and for social policy makers
Preservation of the ability of dissociated quail wing bud mesoderm to elicit a position-related differentiate response
No full textPrevious studies showed that grafting wedges of fresh or cultured anterior quail wing mesoderm into posterior slits in chick wing buds resulted in the formation of supernumerary cartilage in a high percentage of cases. When anterior quail mesoderm, which had been dissociated into single cells and pelleted by centrifugation, was grafted into posterior slits of host chick wing buds, supernumerary rods or nodules of cartilage formed in 74.3% of the cases. Few supernumerary skeletal structures formed following control operations in which pelleted dissociated anterior or posterior mesoderm was grafted into homologous locations in host chick wing buds. When pelleted, dissociated anterior mesoderm was cultured in vitro for 1 or 2 days prior to being implanted in posterior locations, the incidence of supernumerary cartilage formation increased to 95.5% and 93.8%, respectively. The incidence of supernumerary cartilage formation following control orthotopic grafts of cultured mesoderm was 11.8% for 1-day and 31% for 2-day cultured anterior mesoderm; for 1- and 2-day cultured posterior mesoderm, the incidence of supernumerary cartilage formation was 20% and 41.7%, respectively. Longer-term culture resulted in a substantial decrease in the percentage of supernumerary cartilage after anterior to posterior grafts and an increase in the incidence of supernumerary cartilage from control grafts. The results demonstrate that quail anterior wing bud mesodermal cells do not need to maintain constant contact with one another in order to retain the ability to form or stimulate the formation of supernumerary cartilage after being grafted into a posterior location in a host wing bud. This ability is retained when the pelleted dissociated mesoderm is cultured in vitro outside the limb field for at least 1 to 2 days.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/49694/1/1001820108_ftp.pd
Risky Business: Constructing the ‘choice’ to ‘delay’ motherhood in the British press
No full textOver the last few decades the number of women becoming pregnant later on in life has markedly increased. Medical experts have raised concerns about the increase in the number of women having babies later, owing to evidence that suggests that advancing maternal age is associated with both a decline in fertility and an increase in health risks to both mother and baby (Nwandison & Bewley, 2006). In recognition of these risks, experts have warned that women should aim to complete their families between the ages of twenty and thirty-five (Bewley, Davis and Braude, 2005). As a consequence, women giving birth past the age of thirty-five have typically been positioned as ‘older mothers.’ In this paper we used a social constructionist thematic analysis in order to analyse how ‘older mothers’ are represented in newspaper articles in the British press. We examined how the topics of ‘choice’ and ‘risk’ are handled in discussions of delayed motherhood, and found that the media position women as wholly responsible for choosing the timing of pregnancy and, as a consequence, as accountable for the associated risks. Moreover, we noted the newspapers also constructed a ‘right’ time for women to become pregnant. As such, we discuss the implications for the ability of women to make real choices surrounding the timing of pregnancy
Hensen's node, but not other biological signallers, can induce supernumerary digits in the developing chick limb bud
No full textThe purpose of this study was to determine whether the organizer regions of early avian and amphibian embryos could induce supernumerary (SN) wing structures to develop when they were grafted to a slit in the anterior side of stage 19–23 chick wing buds. Supernumerary digits developed in 43% of the wings that received anterior grafts of Hensen's node from stage 4–6 quail or chick embryos; in addition, 16% of the wings had rods of SN cartilage, but not recognizable SN digits. The grafted quail tissue did not contribute to the SN structures. When tissue anterior or lateral to Hensen's node or lateral pieces of the area pellucida caudal to Hensen's node were grafted to anterior slits, the wings usually developed normally. No SN structures developed when Hensen's nodes were grafted to posterior slits in chick wing buds. Wings developed normally when pieces of the dorsal lip of the blastopore from stage 10–11.5 frog ( Xenopus laevis and Rana pipiens ) embryos were grafted to anterior slits. No SN digits developed when other tissues that have limb-inducing activity in adult urodele amphibians [chick otic vesicle, frog ( Rana pipiens ) lung and kidney] or that can act as heteroinductors in neural induction (rat kidney, lung, submaxillary gland and urinary bladder; mouse liver and submaxillary gland) were grafted to anterior slits in chick wing buds. SN digits also failed to develop following preaxial grafts of chick optic vesicles. These results suggest that although the anteroposterior polarity of the chick wing bud can be influenced by factors other than the ZPA (e.g., Hensen's node, retinoids), the wing is not so labile that it can respond to a wide variety of inductively-active tissues.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/47510/1/427_2004_Article_BF00376155.pd
The Evolution of Bat Vestibular Systems in the Face of Potential Antagonistic Selection Pressures for Flight and Echolocation
No full textPMCID: PMC3634842This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited
Kurze Geschichten die von Tieren berichten
No full textThese are moral-heavy stories for young people. They include a mixture of fables. Among the fables are these: Die beiden Ziegen (10); Vom Frosch und der Maus (16); Bestrafter Leichtsinn (19); Der Fuchs und der Rabe (23); Die Grille und der Schmetterling (40); Die zwei Sperlinge (54); and Die Bärenhaut (61). In FM, the frog is introduced immediately as a Schalk. The mouse needs help and will not get it from this frog! These stories are true to the cruelty of the fable-world. They tend to present conflict and death, and the price of winning is often high. Notice the mouse on 19 on whom a brick has fallen because he was careless with a mousetrap. Kids catch a butterfly, break his wing, and smash his head! The duochrome pictures are very nice in this simple children's book.This is a hardbound book (hard cover)Language note: GermanCharley and Meme Wakeford, Assisted by Kate and Susie Tucke
Assessing Mitochondrial DNA Variation and Copy Number in Lymphocytes of ~2,000 Sardinians Using Tailored Sequencing Analysis Tools
No full textCan “the people” be feminists? Analysing the fate of feminist justice claims in populist grassroots movements in the United States
No full textIn this article I examine the fate of feminist justice claims in the context ofgrassroots populist movements in the United States. By exploring populism onthe left—in neighbourhood community organising—and on the right—withinthe community organising among the Tea Party—I argue that a “politics ofauthenticity” is deployed in each movement with strikingly similar effects onthe development of feminist consciousness and justice claims in eachmovement. In left-wing community organising I find that feminist claims aresuppressed in order to preserve solidarity among grassroots actors and to beperceived by movement outsiders as patriotic. On the right I demonstrate howwomen-centric practices are generated through the strategic use of an identityI label “concerned motherhood”. For the Tea Party, women appear to have theability to identify as women for local action but this process seems to threatenboth feminism and democracy by women’s support for a politics of inequality.I conclude with a discussion about whether feminism and populism can bereconciled and the perils that confront feminist activists in the current upsurgeof populist movements around the globe
Challenging maleness : the new woman's attempts to reconstruct the binary code
No full textThis thesis explores the construction of masculinity in novels written by New Women
authors between the years 1881-1899. The fin de siècle was a period during which gender roles were renegotiated with fervour by both male and female authors, but it was the so-called New Woman in particular who was trying to transform the Victorian notion of femininity to incorporate the demands of the burgeoning women’s movement. This thesis argues that in their fiction, New Women authors often tried to achieve this
transformation by creating male characters who were designed to justify and to mitigate
the New Woman protagonist’s departure from traditional structures of heterosexual
relationships. The methodology underlying this thesis is the notion that men and women were perceived as binary opposites during the Victorian period. I refer to this as the binary code of the sexes. This code assumes that men and women naturally possess
diametrically opposed character attributes, and also that “masculine” attributes are
perforce better than “feminine” ones. In the body of this work, I argue that New Women
authors attempted to contest both of these assumptions by creating, on the one hand,
traditional male characters whose masculinity is corrupted in crucial and recurring ways, and on the other, impaired male characters who cannot assume the traditional role of man. The comparison of the New Woman protagonist with the corrupt traditional man elevates her feminine attributes, while the impaired man’s dependency legitimises her acquisition of what were otherwise considered “masculine” attributes and privileges, thereby contesting the notion that men and women possess sex-specific attributes at all.
The second part of my thesis examines contrasting examples, in which this way
of characterising masculinity – as traditional or impaired – is questioned and
manipulated. It examines the limitations of the New Women authors’ specific approach
to reconstructing the binary code
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