Directional Guidance of Nicotiana alata Pollen Tubes in Vitro and on the Stigma1

Pollen tubes navigate the route from stigma to ovule with great accuracy, but the cues that guide them along this route are not known. We reproduced the environment on the stigma of Nicotiana alata by immersing pollen in stigma exudate or oil close to an interface with an aqueous medium. The growth of pollen in this culture system mimicked growth on stigmas: pollen grains hydrated and germinated, and pollen tubes grew toward the aqueous medium. The rate-limiting step in pollen germination was the movement of water through the surrounding exudate or oil. By elimination of other potential guidance cues, we conclude that the directional supply of water probably determined the axis of polarity of pollen tubes and resulted in growth toward the interface. We propose that a gradient of water in exudate is a guidance cue for pollen tubes on the stigma and that the composition of the exudate must be such that it is permeable enough for pollen hydration to occur but not so permeable that the supply of water becomes nondirectional. Pollen tube penetration of the stigma may be the most frequently occurring hydrotropic response of higher plants.

Exploring Existentially-Based Interventions For Career Transitions in Sport

From Introduction: Career transition issues have become of increasing interest in the field of sport psychology. Confronting the end of an athletic career is an inevitable reality that every athlete will confront in his or her lifetime (Baillie, 1993), regardless of level of competition (Kerr & Dacyshyn, 2000) or the amount of free choice related to the transition. Many athletes are able to cope with the effects of the transition process effectively, and see retirement as an opportunity to pursue new ventures and identity roles in life. However, retirement from sport can be an event that often results in various adjustment difficulties for an athlete involving emotional, social, financial, and vocational conflicts. Some athletes have reported experiencing effects such as depression, eating disorders, decreased self-esteem, increased suicidality, and substance abuse (Kerr and Dacyshyn, 2000). These types of distress can be exacerbated by the fact that many athletes fail to adequately anticipate and prepare for their impending transition (Baillie, 1993), and often embark on the retirement process without any formalized support (Stier, 2007).Typically, the role of a sport psychologist has been to assist in maximizing an athlete's competitive performance during the course of their career. However, as a sport psychologist's primary responsibility is to serve active competitors and athletic organizations, this tends to come at the expense of failing to provide follow-up care for the athlete as he or she retires from sport (Taylor, Ogilvie, and Lavallee, 2006). Since the 1970's, when the efforts of professionals in European sports organizations first received attention, there has been growing interest in academic circles about career transition

Early Career Teachers' Efficacy in Working with Families

Partnering effectively with families is an important skill for teachers to have to support student achievement, and one that is especially important for early career teachers in order to protect them from burnout and attrition. However, research has demonstrated that teachers do not feel prepared to work with families, and further research is needed to see what difficulties are specific to early career teachers. The following research questions were addressed in the study: 1) What current situation and prior training factors affect early career teachers’ perceptions of efficacy in working with families? 2) Which family-school partnering topics do teachers report the most experience in their prior preparation programs and in their current daily practice? 3) Is there a relationship between number of years reported teaching and overall efficacy scores? 4) What family-school partnering training do early career teachers believe would have been or would be beneficial to receive in their teacher preparation programs versus during their first five years of practice? A survey was created which included a pre-existing self-efficacy scale adapted to reflect family partnering language. This survey was disseminated to 76 first through fifth year Colorado teachers. Results indicate that age of current school placement had a significant effect on overall self-efficacy scale scores, while several other variables had an effect on subscales of the efficacy scale. Recommendations are presented for future research, teacher preparation programs, and school district mentoring.

Oil and Gas Environmental Documentation Guidance Based on Existing Environmental Assessment Documentation

The hard push for domestic oil and gas production suggests a developing divergence from environmentally sound practices. As states feel the pressure to match energy growth to national need, adequate consideration for the surrounding environment should continue to be a high priority. Through an analyses of twelve environmental assessment documents, recommendations for an oil and gas specific environmental assessment documentation guidance has been created. Guidance recommendations for the affected environment, mitigation options, alternatives, public comment process and the overall approach to an environmental assessment document is outlined within this capstone.

Behavior-Based Safety: Developing a Regional Guidance

A behavior-based safety program improves overall safety culture and safety performance of an organization. A solid behavior-based safety program is achieved by successfully implementing key components. Key components include management commitment to the process, an effective training program, a cohesive observation process and a successful data collecting and reporting system. This Applied Capstone project defines a regional approach for each of the key components of a behavior-based safety program. Recommendations resulting from the project provide the company studied guidance on developing a consistent behavior-based safety program.

Guidance of robot arms using depth data from RGB-D camera

Image Based Visual Servoing (IBVS) is a robotic control scheme based on vision. This scheme uses only the visual information obtained from a camera to guide a robot from any robot pose to a desired one. However, IBVS requires the estimation of different parameters that cannot be obtained directly from the image. These parameters range from the intrinsic camera parameters (which can be obtained from a previous camera calibration), to the measured distance on the optical axis between the camera and visual features, it is the depth. This paper presents a comparative study of the performance of D-IBVS estimating the depth from three different ways using a low cost RGB-D sensor like Kinect. The visual servoing system has been developed over ROS (Robot Operating System), which is a meta-operating system for robots. The experiments prove that the computation of the depth value for each visual feature improves the system performance.

General mental ability as moderator of personality traits as predictors of early career success

In this paper, we examine the effects of general mental ability (GMA) and the personality traits defined in the big five model on extrinsic and intrinsic indicators of career success, in a sample of 130 graduates who were in the early stages of their careers. Results from hierarchical regression analyses indicated that GMA does not predict any of the success indicators. In contrast, the combination of GMA and three of the Big Five Personality traits, conscientiousness, neuroticism, and openness, is significantly associated with greater early career success and has incremental predictive validity.

Does Trait Emotional Intelligence Predict Unique Variance in Early Career Success Beyond IQ and Personality?

In order to determine the contribution of emotional intelligence (EI) to career success, in this study, we analyzed the relationship between trait EI (TEI), general mental ability (GMA), the big five personality traits, and career success indicators, in a sample of 130 graduates who were in the early stages of their careers. Results from hierarchical regression analyses indicated that TEI, and especially its dimension “repair,” has incremental validity in predicting one of the career success indicators (salary) after controlling for GMA and personality. These findings provide support for the use of TEI measures as predictors of career success in the early stage.

Control and Guidance of Low-Cost Robots via Gesture Perception for Monitoring Activities in the Home

This paper describes the development of a low-cost mini-robot that is controlled by visual gestures. The prototype allows a person with disabilities to perform visual inspections indoors and in domestic spaces. Such a device could be used as the operator's eyes obviating the need for him to move about. The robot is equipped with a motorised webcam that is also controlled by visual gestures. This camera is used to monitor tasks in the home using the mini-robot while the operator remains quiet and motionless. The prototype was evaluated through several experiments testing the ability to use the mini-robot’s kinematics and communication systems to make it follow certain paths. The mini-robot can be programmed with specific orders and can be tele-operated by means of 3D hand gestures to enable the operator to perform movements and monitor tasks from a distance.

ISSP Position Stand: Career Development and Transitions of Athletes

The ISSP Position Stand on Career Development and Transitions of Athletes draws attention to viewing athletes from the perspective of their career development and their broader historical and socio‐cultural contexts. The particular focus of this paper is on career transitions as turning phases in career development. Successfully coping with transitions both within and outside of sport allows greater opportunity for an athlete to live a long and successful life in sport as well as being able to adjust effectively to the post‐career. Alternatively, failure in coping with a transition is often followed by negative consequences (e.g., premature dropout from sport, neuroses, alcohol/drug abuse, etc.). Therefore, helping athletes prepare for and/or cope with career transitions should be of primary concern for coaches, managers, athletes’ parents, and sport psychology consultants. In this paper we emphasize the role of contextual factors in career development/transition research and practice. Based on the literature review, we propose six statements and related recommendations for athletes and their significant others, as well as for researchers and consultants