Size-dependent trajectories of DNA macromolecules due to insulative dielectrophoresis in submicrometer-deep fluidic channels

In this paper, we demonstrate for the first time that insulative dielectrophoresis can induce size-dependent trajectories of DNA macromolecules. We experimentally use λ (48.5 kbp) and T4GT7 (165.6 kbp) DNA molecules flowing continuously around a sharp corner inside fluidic channels with a depth of 0.4 μm. Numerical simulation of the electrokinetic force distribution inside the channels is in qualitative agreement with our experimentally observed trajectories. We discuss a possible physical mechanism for the DNA polarization and dielectrophoresis inside confining channels, based on the observed dielectrophoresis responses due to different DNA sizes and various electric fields applied between the inlet and the outlet. The proposed physical mechanism indicates that further extensive investigations, both theoretically and experimentally, would be very useful to better elucidate the forces involved at DNA dielectrophoresis. When applied for size-based sorting of DNA molecules, our sorting method offers two major advantages compared to earlier attempts with insulative dielectrophoresis: Its continuous operation allows for high-throughput analysis, and it only requires electric field strengths as low as ∼10 V∕cm.     

Collaborative knowledge-making in the everyday practice of youth suicide prevention education

The development and implementation of a new school‐based suicide prevention education programme in one secondary school in Vancouver, British Columbia, recently provided us with an opportunity to conduct an in‐depth, qualitative case study. The purpose of our study was to deepen our understanding of how school‐based suicide prevention education programmes like this one get planned and enacted in particular, local settings. We argue that the narrow range of methodologies that have traditionally been deployed to study school‐based youth suicide prevention education programmes have hindered our ability to see the complexities and potentialities of this work. Through the presentation of a sub‐set of findings, we aim to show the possibilities for fresh thinking and contextualized understandings that a qualitative case study, informed by a constructionist methodology, invites.     

Connecting to nature at the zoo: implications for responding to climate change

Societal response to climate change has been inadequate. A perception that the issue is both physically and temporally remote may reduce concern; concern may also be affected by the political polarization surrounding the issue in the USA. A feeling of connection to nature or to animals may increase personal relevance, and a supportive social context may counteract political tensions. Zoos may provide opportunities for both sense of connection and social support. We surveyed over 7000 zoo and aquarium visitors to examine the ways in which a feeling of personal connection among zoo visitors may encourage concern about climate change. Results show that feeling connected to animals at the zoo is significantly associated with cognitive and emotional responses to climate change, as well as with other social groupings and social responses. Overall, the zoo seems to present a supportive social context for considering the topic.     

Two critical psychological components of ski racing: Fun and feelings

The concepts of having fun and being aware of feeling states are presented as two critical factors in ski racing. First, the positive motivational characteristics of ‘fun’ are outlined. It is suggested that fun is not only a concept for young athletes but elite ones as well. Preliminary data based on a questionnaire, completed by the United States Alpine Ski Team and approximately 150 ski coaches, are presented. Second, the discussion on feelings refers to the mental programming of tactile sensations and determining one's emotional arousal (feeling state) prior to, and during, competition. Practical suggestions are made with regard to the psychological states and their effects on ski racing.     

Academic advisement: An untapped resource

A Comparative Study of the Secondary Eduaation of Girls in England, Germany, and the United States. By Yoshi Kasuya. 1933. New York: Teachers College, Columbia University. Pp. x + 211.

Secondary Education. By Thomas H. Briggs. New York: The Macmillan Company, 1933. Pp. x + 577.

Leadership Among High School Pupils. By Marion Brown. New York: Bureau of Publications, Columbia University, 1933. Pp. viii + 166.

Administration of Enrichment to Superior Children in the Typical Classroom. By J. Edgar Dransfield. 1933. New York: Teachers College, Columbia University. Pp. v + 107.

Bible Readings in Character and Citizenship. Compiled by A. L. Morgan. Cokesbury Press.

The Romance Research. By L. V. Redman and A. V. H. Mory. Baltimore: The Williams and Wilkins Company, 1933. Pp. x + 149.

History of the State Teachers College, Radford, Virginia, 1910–1930. By M'Ledge Moffett. Radford, 1932. Pp. xii + 143 + 142A.

My Second Writing Book. By Jennie Wahlert and A. O. Leutheusser. Chicago: Laurel Book Company, 1933. Pp. 64. Nice arrangement. Interesting in formation. Varied content. M. R.

Problems of Education in the United States. By C H. Judd. McGraw‐Hill, 1933. Pp. 214.

The Psychology of Study. By C. A. Mace. R. M. McBride and Company. Pp. 96.

Physiology of Muscular Activity. By E. C. Schneider. W. B. Saunders Company, 1933. Pp. 401.

Basic Units in Mechanical Drawing—Book I. By Hoelscher and Mays. John Wiley and Sons, 1933. Pp. 288.

The Junior Outline of History. By I. O. Evans. D. Appleton and Company, 1933. Pp. 295.

An Introduction to Conrad. By F. W. Cushwa. Doubleday Doran, 1933. Pp. 436.

The Influence of Familiarity Upon Children's Preferences for Pictures and Poems. By James E. Mendenhall and Marcia E. Mendenhaia. 1933. New York: Lincoln School, Columbia University. Pp. x + 75.

The Library in the School. By Lucile Fargo. American Library Association, 1933. Pp. 479.

Then and Now in Dixie. By Rose Mortemer Elizey Macdonald. New York: Ginn and Company, 1933. Pp. vii + 293.

The Dilemma of Democracy. I. L. Kandel. Harvard University Press, 1934. Pp. 79.

Do College Students Choose Vocations Wisely? Edward Sparling. Teachers College Bureau of Publications, 1933. Pp. 110.

Student Aid in the Secondary Schools of the United States. By Verna A. Carley. New York: Columbia University, 1933. Pp. vii + 118.

Responsibility for Rural‐School Administration. By Frank W. Cyr. New York: Teachers College, Columbia University. Pp. vi + 158.

Annual and Semi‐Annual Promotion. By J. Armour Lindsay, 1933. New York: Teachers College, Columbia University. Pp. vii + 170.

The Technique and Administration of Teaching. By Noble Lee Garrison. Cincinnati: American Book Co., 1933. Pp. xiv + 593.

Little Carolina Blue Bonnet. By Mabel Pugh. New York: Thomas Y. Crowell Company, 1933. Pp. 171. Little girls from eight to twelve will enjoy this simple, charming story. It will be of

Practical Exercises in News Writing. By Douglass Wood Miller. New York: D. C Heath and Company, 1933. Pp. 131.

Heath Readings in the Literature of Europe. By Tom Peete Cross and Clark H. Slover. New York: D. C. Heath and Company, 1933. Pp. xv + 1194.

The Founding of Maryland. By Matthew Page Andrews. New York: D. Appleton‐Century Company, 1933. Pp. xii + 367.

The Case Method Technique in Professional Training. By D. Henryetta Sperle. New York: Teachers College, Columbia University, 1933. Pp. vi + 92.

Adult Education and The Social Scene. By Ruth Kotinsky. New York: D. Appleton‐Century Company, 1933. Pp. xxi + 208.

Skyscraper. By Elsa H. Naumburg, Clara Lambert, Lucy Sprague Mitchell. New York: The John Day Company, 1933. Pp. 80.

The Community and Society. By Loran D. Osborn and Martin H. Neumeyer. Cincinnati: American Book Company, 1933. Pp. x + 468.     

Training Judges to Generate Standard-Setting Data

Is training judges beyond initial orientation required? How can we help judges apply their conceptualization of minimal competence to individual items?     

The three “Ds“ of successful performance measurement: Design,data, and display

Performance measurement is a critical enabler for better understanding, managing, and improving performance. The ultimate success of any performance measurement development effort is primarily a function of mastering the three “Ds“ of design, data, and display. It should always be remembered, however, that the real goal of any performance measurement system is to provide performance‐based data that can be easily converted into actionable performance‐based knowledge, thus enabling users to understand, manage, and improve what they measure.