Analysis of cell signaling during floral abscission in arabidopsis

2017 ◽  
Author(s):  
◽  
Isaiah Taylor

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] The shedding of plant organs is known as abscission. Floral abscission in Arabidopsis is regulated by two related receptor[negation symbol]-like protein kinases (RLKs), HAESA and HAESA[negation symbol-like 2 (HAE/HSL2). Double mutants of HAE/HSL2 are completely defective in abscission and retain sepals, petals, and stamen indefinitely. We have utilized genetic suppressor screens of hae hsl2 mutant to identify additional regulatory mechanisms of floral abscission. We have uncovered a series of gain-of-function alleles of the receptor-like protein kinase gene SERK1, as well as loss of function alleles of the gene MAP-KINASE-PHOSPHATASE-1/MKP1. We further show that mutation of two components of the endoplasmic reticulum-associated protein degradation system can suppress a weak hae hsl2 mutant, suggesting that the weak hae hsl2 mutant receptor proteins undergo ER-associated protein degradation. We further perform a number of experiments to examine the impact of phosphorylation on the activity of HAE. These results provide a number of important mechanistic details to our understanding of floral abscission, and suggest many lines of inquiry for future research.

2016 ◽  
Author(s):  
◽  
Christine Ferris

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] [1] NEW CLASSIFICATIONS FOR CHAIRMEN OF THE BOARD -- I DID IT MY WAY. In this paper I determine whether a new classification of chairmen (former CEOs) should be added to the traditional current CEO and independent categories. I examine the impact the three categories of chairmen have on firm performance and whether CEO compensation differs between the three categories. If firms with chairmen who are former CEOs have significantly different firm performance or CEO compensation than the other two groups, a third category of chairmen (former CEOs) should be used in future research. The findings shed light on the value of having former CEOs control the board, and should influence the results of studies using chairmen as a control variable. I find that chairmen who are former CEOs are significantly different than current CEOs and independent chairman, and should be separated into their own category. Firms with chairmen who are former CEOs have highest firm performance. These firms also pay less in CEO compensation than firms with current CEOs/chairmen but more than firms with independent chairmen. [2] A TEMP IN THE CORNER OFFICE : THE IMPACT OF INTERIM CEOS ON FIRM PERFORMANCE. This paper examines the impact an interim CEO's previous experience and tenure length have on accounting- and market-based firm performance. I also examine the number of significant changes an interim CEO makes to the firm and the impact of those changes. I find that the prior experience an interim CEO has does not have a significant impact on firm performance. Interim CEOs are significantly less likely to make major changes to the firm than their predecessors; however, some of the changes they make have a significant impact on firm performance.


Author(s):  
Shunhua Bai ◽  
Junfeng Jiao

Travel demand forecast plays an important role in transportation planning. Classic models often predict people’s travel behavior based on the physical built environment in a linear fashion. Many scholars have tried to understand built environments’ predictive power on people’s travel behavior using big-data methods. However, few empirical studies have discussed how the impact might vary across time and space. To fill this research gap, this study used 2019 anonymous smartphone GPS data and built a long short-term memory (LSTM) recurrent neural network (RNN) to predict the daily travel demand to six destinations in Austin, Texas: downtown, the university, the airport, an inner-ring point-of-interest (POI) cluster, a suburban POI cluster, and an urban-fringe POI cluster. By comparing the prediction results, we found that: the model underestimated the traffic surge for the university in the fall semester and overestimated the demand for downtown on non-working days; the prediction accuracy for POI clusters was negatively related to their adjacency to downtown; and different POI clusters had cases of under- or overestimation on different occasions. This study reveals that the impact of destination attributes on people’s travel demand can vary across time and space because of their heterogeneous nature. Future research on travel behavior and built environment modeling should incorporate the temporal inconsistency to achieve better prediction accuracy.


2015 ◽  
Author(s):  
◽  
Reza Houston

[ACCESS RESTRICTED TO THE UNIVERSITY OF MISSOURI AT AUTHOR'S REQUEST.] This study is an examination of the relationship between political connections and the undertaking of major firm events. In our first essay, presented in Chapter 3, we examine the impact politically connected appointments have on firm acquisition behavior. Using proxy statements, we create a unique database of politically connected bidders and merger targets. We find that bidders who hire connected individuals to the board or management team are more likely to avoid merger litigation. Connected bidders make more bids after the appointment. These firms also bid on larger targets. We determine there is a positive relation between the control premium and the relative of the target's connections. Connected acquirers have superior post-merger accounting performance, particularly when they acquire a connected target firm. In the second essay, presented in Chapter 4, we examine the relationship between political connections of private firms and the initial public offering process. Using registration statement information, we create a unique database of politically connected IPO firms. We find that political connections are substitutes to high-quality underwriters and big four auditors. Politically connected firms manage earnings more highly upward than non-connected firms prior to the public offering. Politically connected firms also exhibit less underpricing than non-connected firms. Politically connected IPO firms also have superior post-IPO returns relative to non-connected IPO firms.


2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Ana Clara Carvalho Tourinho ◽  
Sabrina Andrade Barbosa ◽  
Özgür Göçer ◽  
Klaus Chaves Alberto

PurposeUsing the campus of a Brazilian university as case study, this research aims to identify which aspects of the outdoor spaces are the most significant in attracting people.Design/methodology/approachThis research relies on the application of different post-occupancy evaluation (POE) methods, including user tracking, behavioural mapping and questionnaires, on one plateau of the campus.FindingsThree group of aspects (socialization, proximity and infrastructure) were identified as key elements in explaining the impact of the campus physical characteristics on users’ behaviour. The results indicate that having characteristics of at least one group of aspects in those spaces can guarantee their vitality and, if there is presence of attributes of more than one group, liveliness can be increased.Research limitations/implicationsFurther studies should be conducted on an entire campus to identify other spatial elements in the three groups.Practical implicationsThis research contributes to the planning of future campuses and to solutions to the existed ones, indicating the most relevant spatial characteristics to be considered. Additionally, the combination of different methods may be useful to future research.Originality/valueMost of the investigations on the university campuses focus on the buildings, and little research has investigated the outdoor spaces, although they play a critical role in learning and academic life, where people establish social, cultural and personal relationships. In addition, studies using several POE allowed a consistent and complete diagnostic about the aspects of the campus, giving recommendations for future projects.


2021 ◽  
Author(s):  
Negeen Aghassibake ◽  
Lynly Beard ◽  
Jackie Belanger ◽  
Diana Louden ◽  
Robin Chin Roemer ◽  
...  

As part of ARL’s Research Library Impact Framework initiative, the University of Washington (UW) Libraries explored UW faculty and postdoctoral researcher needs for understanding and communicating the impact of their work, with a focus on researchers in science, technology, engineering, and math (STEM) and health sciences fields. The project was designed to understand the challenges researchers face in this area, identify how participants in these fields define and measure impact, and explore their priorities for research-impact support. The project team conducted a survey and follow-up interviews to investigate these questions. This research report presents the project team’s methodology, findings, and recommendations for future research.


Author(s):  
Jianzhong Hong ◽  
Johanna Heikkinen ◽  
Mia Salila

Recent studies on university–industry collaboration have paid a growing attention to complementary knowledge interaction, which is of crucial importance for networked learning and knowledge co-creation needed in today’s rapidly changing markets and for gaining global competitiveness. The existent studies concentrate on the transfer of knowledge from the university to the company, and the impact of culture is examined with a focus on fundamentally different cultures between two types of organizations (i.e., between universities and firms). The studies, however, remain highly fragmented in cultural exploration on one level, and are primarily concerned with one-way technology and knowledge transfer. Research on more interactive knowledge interaction (e.g., collaborative knowledge creation) and especially in the Chinese context is seriously lacking. This chapter explores university–industry knowledge interaction in a broad sense, focusing on the development of a conceptual view on the understanding and analysis of the cultural impact in the Chinese MNC context. The chapter is an early work in process and it is theoretical in nature. It clarifies and elaborates key concepts and perspectives, and suggests implications for future research and practice regarding effective knowledge co-creation involving dissimilar cultures.


Author(s):  
Paul Allatson

The second issue of PORTAL Journal of Multidisciplinary International Studies for 2006 features a special selection of essays grouped under the title ‘Women in Asia’ and guest-edited by Devleena Ghosh and Barbara Leigh, both from the University of Technology Sydney. The essays in this special issue had their first incarnations at the Eighth Women in Asia Conference, ‘Shadow Lines’, organised by the Women’s Caucus of the Asian Studies Association of Australia and the University of Technology Sydney (convened by Ghosh and Leigh), and held at the University of Technology Sydney from 26 to the 28 September 2005. Aiming self-consciously and tacitly to toy with, and dispute, the historical and discursive valencies accruing to the key, twined terms ‘women’ and ‘Asia’, the ten essays grouped here combine to form a rich repository of contemporary research about the status of women in many parts of that vast, arguably incoherent, geocultural space called Asia. All of the contributing authors thus ‘attempt to unsettle discourses about limits,’ to cite from co-editor Devleena Ghosh’s opening paper. That attempt is far from straightforward, as Ghosh elaborates: ‘That lines, borders and boundaries exist, whether of prejudice, politics, economics, or culture, is undeniable. But how do we analyse these issues without ossifying them, creating implacable alterities that refuse the liminal spaces that people occupy?’ Multivalent solutions are called for, Ghosh suggests, and these are to be found not simply in ‘counter-politics and interventions’, but also through the excavation and recognition of multiple subjectivities from/in ‘a thousand plateaus, [and] felt and experienced through the body, historical landscapes, domestic spaces, through performance as well as through the realm of the imaginary, in the impact of ideals and the weight of history’. In addition to the special section on ‘Women in Asia’, this edition of PORTAL contains two essays in its general academic section. François Provenzano’s ‘Francophonie et études francophones: considérations historiques et métacritiques sur quelques concepts majeurs’ offers a sustained meditation and critique of the discourse of Francophonic unity, and suggests a range of possible critical directions for future research into the study of French-speaking zones, peoples and cultures. Barbara Elizabeth Hanna and Juliana de Nooy’s ‘The Seduction of Sarah: Travel Memoirs and Intercultural Learning’, focuses on a big-selling memoir that was also something of a media-sensation on its publication in Australia in 2002, expatriate Australian journalist Sarah Turnbull’s account of her ambivalent ‘new life’ in Paris, France, after her marriage to a local: Almost French: A New Life in Paris. Interested in Turnbull’s autobiography as a potentially useful and productive classroom text for demonstrating, and enabling discussion of, intercultural difference, the authors’ rich analysis demonstrates that such texts present a host of problems to the teacher keen to work with students’ self-critical capacities to locate themselves in international and transcultural frameworks. We are delighted, as well, to present three cultural works in this issue: Katherine Elizabeth Clay’s evocative ‘comic’ narrative of study abroad, ‘From Penrith to Paris,’ itself a lively visual-textual antidote to Turnbull’s ambivalently romanticized view of (not-quite)-belonging in Paris (as discussed by Hanna and de Nooy in this issue); a typically idiosyncratic satire about the current German Chancellor, Angela Merkel, from Anthony Stephens, expertly deploying an ancient Celtic narrative verse form; and California-based Chicana writer Susana Chávez-Silverman’s code-switching chronicle/crónica, ‘Oda a la ambigüedad Crónica,’ a beautifully concise exploration of loss and the sensory regime of memorialisation. Paul Allatson, Chair, PORTAL Editorial Commitee


1974 ◽  
Vol 35 (3) ◽  
pp. 1135-1142 ◽  
Author(s):  
E. Virginia Calkins ◽  
James M. Richards ◽  
Andrew McCanse ◽  
Michael M. Burgess ◽  
T. Lee Willoughby

This paper reports the impact on admission to the University of Missouri-Kansas City's 6-yr. combined baccalaureate-doctor of medicine program of an innovation in selection procedures. In 1973 and 1974, the school's Council on Selection de-emphasized high school academic performance but continued to consider extensive biographical and interview data. Significant differences emerged in the correlations of various selection criteria with the Council's ratings of candidates in 1973 and 1974 in comparison with the prior year. Specifically, admission test score which had the highest correlation (.58) in 1972 was only .18 in 1973. The negative correlation (−.30) of race (discriminatory toward non-whites) in 1972 was not present in 1973 or 1974. Instead, the highest correlations were the interviewers' ratings and recommended decisions.


2015 ◽  
Author(s):  
◽  
Paulina Perkins

For this qualitative case study, the aim was to better understand what informs study abroad advising practices from the perspective of the advisor and to examine these practices for evidence of developmental advising using Crookston's (1972) developmental advising framework. This study significantly contributes to the very limited research that is available on advising for study abroad. Because of its limited nature, much of the review of the literature for this study centers on research in the field of academic advising, a closely related field, rather than study abroad advising. Five study abroad advisors at the University of Missouri participated in this study. The data were collected through interviews, written reflections, and video recorded advising appointments. There are four distinct themes that inform study abroad advising practices: relevant experiences, formal training, resources, and professional experience. Additionally, there are elements of developmental advising practiced by the advisors in this study, including abilities, rewards, maturity, responsibility, and relationships. The implications for future research include studies related to the student perspective on developmental advising, longitudinal studies, student outcomes, and evaluation of study abroad advising practices. As for practical implications, this study can help inform training of study abroad advisors as well as student peer advisors; potentially increase the diversity of the study abroad population by having advisors utilize personal identity to build relationships with students; and, may serve to justify curricular changes within student affairs degrees to include student advising, which is currently lacking in many master's level programs.


2002 ◽  
Vol 39 (6) ◽  
pp. 587-596 ◽  
Author(s):  
Kelly Ritter ◽  
Carroll-Ann Trotman ◽  
Ceib Phillips

Objective In patients with cleft lip and palate, the aim of the study was (1) to determine and compare the level of agreement among examiners’ subjective evaluations of static and dynamic lip form; (2) assess possible bias of examiners’ subjective evaluations; and (3) determine the impact of lip scarring on an examiner's subjective assessment of dynamic lip form. Setting Patients and subjects were recruited from the University of North Carolina Cleft Lip and Palate Center and School of Dentistry. Patients, Participants Thirteen patients with unilateral cleft lip and palate and varying degrees of cleft scar severity were selected and one subject without cleft who wore artificial scars of varying severity. Interventions For the patients with cleft, a previously repaired complete cleft lip and palate. Photographs and videotape recordings were made of the patients with cleft and the subject without cleft, with and without the artifical scars, at rest and smiling. Main Outcome Measure(s) Rankings of cleft scar severity and impairment on a 6-point Likert scale by a lay and professional panel. Results Intra- and interexaminer reliability was good for the lower facial regions at rest but not during movement. Professionals gave ratings of greater severity and impairment than laypersons, and professionals agreed when rating the lower faces at rest more so than during movement. Lip scarring affected perceptions of impairment during movement by viewers in both panels. Conclusions Subjective assessments can be affected by methodological approaches, professional experience, and stimulus type. Future research should focus on establishing objective methods to evaluate patients with cleft lip and palate at rest and during function.


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