Movement of Spermatozoa in Viscous Environments

Observations of the effects of increased viscosity have been important in attempting to understand the mechanical forces and molecular mechanisms involved in cell motility. Berg & Turner (1979) have recently demonstrated that the movement of bacteria at increased viscosities depends on the nature of the macromolecules used to obtain increased viscosities. With methyl cellulose, an unbranched, long-chain polymer, decreases in rotation rates of tethered E. coli were much less than with Ficoll, a highly branched polymer, even though the viscosities measured at the macroscopic level were similar. At the microscopic level, methyl cellulose apparently forms a loose, quasi-rigid network in solution, which is easily penetrated by particles on the scale of bacteria and their flagella, but makes a substantial contribution to the macroscopic viscosity of the solution even at concentrations where 'non-Newtonian' behavior is minimal. This observation has led us to re-examine earlier measurements on the effects of viscosity on the movement of sperm flagella, which were made using methyl cellulose to increase the viscosity (Brokaw, 1966; Brokaw & Simonick, 1977)

Color identification testing device

Testing device, which determines ability of a technician to identify color-coded electric wires, is superior to standard color blindness tests. It tests speed of wire selection, detects partial color blindness, allows rapid testing, and may be administered by a color blind person

Organizational change and development : annotated and supplemental bibliography / 191

Includes bibliographical references (p. 48-80)

Guides for Interscholastic Athletic Travel in Class B Secondary Schools of North-Central Kansas

The purpose of the study is to secure facts pertaining to the subject that are in use at the present time throughout the chosen area. After analyzing the findings of the study and studying the literature, recommendations have been made

Innovative HVAC Cycles for Severe Part Load Conditions in the Humid Climate

This paper reports observations by the authors made in the course of performing field surveys and detailed analyses of approximately three hundred U. S. Navy buildings located in a humid climate. In the course of this work humidity related problems were found in many of the buildings. Face & bypass control is suggested as one of the best methods of achieving passive humidity control under common difficult part load conditions. However, some conditions cannot be handled without additional measures. This paper explores techniques, other than reheat, as means for improving space comfort conditions under the worst conditions. It is shown that pre-cooling or desiccant dehumidification of ventilation air can offer substantially improved performance, especially in conjunction with varying the ventilation air quantity as a percentage of supply air

Third Time’s a Charm: The Case of Tennessee’s Four Junior Football Players who Endured Three Different Head Coaches in Three Seasons

For college student-athletes enduring multiple head coaching changes during their careers, challenges include changes in the level of competition, lifestyle pressures, identity issues, loss of support system, and changes in training environment. Student-athletes are required to build relationships with a new head coach while facing issues with loneliness, frustration, discouragement, self-doubt, and feelings of decreased self-worth. This unique case study examined the transitions of junior student-athletes at the University of Tennessee who played for three different head coaches. Themes that were constructed from challenges the student-athletes faced were: Trust, Individual and Team Strength, and Future. A tremendous amount of effort and resources is poured into coaching searches but there seems to be little for the student-athletes during transitional periods of coaching changes. These findings demonstrate that transition is not something that easily happens and may not happen at all, which leads to student-athletes transferring after any coaching change. Resources and counseling services should be made available to assist student-athletes in this transition and not make the coach the focus of the transition

The Importance of Perceived Relevance: A Qualitative Evaluation of Patient’s Perceptions of Value and Impact Following a Low-Intensity Group-Based Pain Management Program

Background and objectives: Limited evidence exists exploring perceptions of which aspects of a pain management program are perceived as valuable and impactful. The aim of this study was to explore patient beliefs about which aspects of a pain management program were valued and/or had perceived impact. Materials and Methods: One-on-one structured interviews were conducted with 11 adults three months after their completion of the Spark Pain Program at Westmead Hospital, Sydney, Australia. Concepts in the transcripts were inductively identified and explored, utilizing thematic analysis to better understand their relevance to the study aim. Results: Four themes emerged: (1) “The program overall was positive, but…”; (2) “I valued my improved knowledge and understanding of pain, but…”; (3) “I valued the stretching/relaxation/pacing/activity monitoring”; and (4) “I valued being part of a supportive and understanding group”. Participants reported that they liked being treated as an individual within the group. A lack of perceived personal relevance of key messages was identified in some participants; it appears that patients in pain programs must determine that changes in knowledge, beliefs, and attitudes are personally relevant in order for the changes to have a significant impact on them. Conclusions: This study provides new insights into aspects of a pain management program that were perceived as valuable and impactful, areas that “missed the mark”, and hypotheses to guide the implementation of service delivery and program redesig