The importance of orientation: implications of professional identity on classroom practice and for professional learning

Previous work on new teacher professional identity has focused on identity as a process of negotiation between individual and contextual factors. These negotiations are often filled with a struggle between personal agency and structures that prevent the enactment of an ideal professional self. This study introduces and discusses three teacher professional identity orientations (self, classroom, and dialogic) and the implications of each orientation on a teacher’s professional identity and classroom practice. While each focal teacher featured in the study drew from similar sources of professional identity (experiences as students, classroom practical experience, and theory/research), the teachers varied in the degree of importance accorded to each identity source. This variation led to differences in approach to their roles as teachers as well as differences in their work with students. Using a qualitative, comparative case study methodology to highlight features of each professional identity orientation, this study provides evidence of discourse related to each orientation and discusses implications of identity orientation in each case study teacher’s classroom practice. After the discussion and analysis of the data, the author offers recommendations for teacher educators (pre-service and in-service) and researchers related to understandings of professional identity development and implications for the work of pre-service teacher education and continuing professional development.     

Hematocrit and flow rate regulate the adhesion of platelets to von Willebrand factor

Primary hemostasis and blood clotting is known to be influenced by the red blood cell volume fraction (hematocrit) in blood. Depressed or elevated levels of red blood cells can lead to vascular perfusion problems ranging from bleeding to thrombus formation. The early stage of hemostasis and thus blood clotting in all vessel sections from the arterial to the venous system involves the adhesion of platelets to von Willebrand factor. Here we present experimental and theoretical results showing that the adhesion probability of platelets to von Willebrand factor is strongly and nonlinearly dependent on hematocrit and flow rate. Interestingly, the actual binding forces are not markedly different, which suggest that the origin of such behavior is in the distribution of platelets. Using hydrodynamic simulations of a simple model, we explicitly show that the higher the hematocrit and the flow rate, the larger the amount of platelets residing close to the wall. Our simulation results, which are in excellent agreement with the experimental observations, explain why such phenomena occur. We believe that the nonhomogeneous red blood cell distribution as well as the shear dependent hydrodynamic interaction is key for the accumulation of platelets on the vessel wall. The work we present here is an important step forward from our earlier work on single molecules and extends into the collective cellular behavior of whole blood. It sheds new light on the correlation between hematocrit and the initial steps in hemostasis and thrombosis, and outlines advances for the treatment of vascular diseases associated with high levels of red blood cells. These results are not only highly relevant for the field of hemostasis and the physics of blood clotting but are also of powerful impact in applied science most obviously in drug delivery and colloidal science.     

Using coaching to increase preschool teachers’ use of emergent literacy teaching strategies

This single-subject study assessed the effects of in-classroom coaching on early childhood teachers’ use of emergent literacy teaching strategies. Teaching strategies were grouped into clusters related to oral language and comprehension of text, phonological awareness and alphabetic principle, and print concepts and written language, with coaching being applied to each cluster separately. The coaching process included two primary components: a brief initial meeting to introduce teaching strategies in the cluster, and semi-weekly observation with follow-up discussion using data collected during the observation. A third, booster component was added when the teacher did not achieve a pre-established criterion. Participants were five early childhood teachers, three in child care programs and two in public school pre-kindergarten programs. The intervention phase lasted approximately 6 weeks for each teacher. Results indicated that this approach to coaching was effective for increasing the number of teaching strategies that teachers used in each cluster. Individual differences among teachers are discussed, and implications for future research and practice are explored.     

Confucian Principles: A Study of Chinese Americans’ Interpersonal Relationships in Selected Children’s Picturebooks

There has not been enough critical analysis of children’s literature by and about Chinese Americans, especially when compared to other minority groups in the United States. In particular, Chinese American historical books lack extensive analysis. It is important to reflect cultural accuracy in literature and to help children develop clear concepts of self and others by providing precise cultural and physical characteristics of people. While cultural authenticity allows children the opportunity to see a reflection of real experiences within a book instead of seeing stereotypes or misrepresentations, obtaining correct information about a certain time period can help children to see images of immigration accurately represented in literature. Using the Confucian delineation of interpersonal relationships as the major criterion of cultural authenticity, this article examines three currently available children’s picturebooks set in the historical period between 1848 and 1885. In addition to exploring how Chinese Americans’ interpersonal relationships are portrayed in these children’s historical books, this article argues for more proactive inclusion of the diversity in selection of picturebooks.     

解析iSchools联盟发展现状与特色

从iSchools成员的分布、系所名称、博士班学程的特色,剖析iSchools成员的属性,以期能从中观察iSchools对资讯领域产生的影响。研究结果显示,目前iSchools 38个成员以美国为主,遍及欧、亚、澳各地,形成全球资讯学院联盟,有助于学术交流与合作。再者,其中有12个成员(占31.6%)来自ALA认可的学校,比例颇高,且其系所名称多单独使用资讯或资讯研究一词,传统的图书馆学系所在此已显式微。至于系所名称的表现,iSchools偏重资讯领域,有65.8%的系所名称以资讯一词起始、97.4%的系所名称涵盖资讯一词,显见资讯在此群组的主导性。最后,在人才培植方面,iSchools锁定资讯领域的高级学术、研究人才、企业界的高阶主管为目标,普设博士班学程,跨学科的课程以资讯为主体,强调科技应用。     

The Bumpy Road to Universal Access: An Actor-Network Analysis of a U.S. Municipal Broadband Internet Initiative

Universal high-speed Internet access can productively transform a nation's economy. However, many municipalities in the United States have been left behind in terms of Internet penetration. Some municipal governments have tried to address this by launching initiatives that aim at offering citywide, universal broadband access. Unfortunately, most of these initiatives either have been discontinued or have ended in failure. Drawing on actor-network theory, we conducted a 3-year study to investigate the evolution of the Internet TV initiative in LaGrange, Georgia, in the United States. The results reveal distinct interpretations of the initiative by different actor groups (the government, the service providers, socioeconomically advantaged residents, and socioeconomically disadvantaged residents), at different stages of implementation, pointing to tensions among the various groups. These tensions reflect the structural problems embedded in the macro political, economic, and societal context. The findings offer insights for policymakers who intend to achieve universal broadband access.     

Physical activity correlates for children with autism spectrum disorders in middle school physical education

This study examined potential correlates that might influence physical activity (PA) of adolescents with autism spectrum disorders (ASD) in physical education. Students with (n = 19) and without (n = 76) ASD wore an accelerometer during physical education. Data were collected in 38 physical education lessons. The results showed that (a) students with ASD were less physically active than their peers, (b) their PA was related positively to their social interaction with peers, and (c) their moderate to vigorous PA depended on PA content, physical environment, and instructor-related characteristics. The findings suggest a need for additional studies on the relationship between the needs of adolescents with ASD and the content offered in physical education so as to inform school policies and help to remove barriers to promoting PA among this population.     

A self-contained polymeric cartridge for automated biological sample preparation

Sample preparation is one of the most crucial processes for nucleic acids based disease diagnosis. Several steps are required for nucleic acids extraction, impurity washes, and DNA/RNA elution. Careful sample preparation is vital to the obtaining of reliable diagnosis, especially with low copies of pathogens and cells. This paper describes a low-cost, disposable lab cartridge for automatic sample preparation, which is capable of handling flexible sample volumes of 10 μl to 1 ml. This plastic cartridge contains all the necessary reagents for pathogen and cell lysis, DNA/RNA extraction, impurity washes, DNA/RNA elution and waste processing in a completely sealed cartridge. The entire sample preparation processes are automatically conducted within the cartridge on a desktop unit using a pneumatic fluid manipulation approach. Reagents transportation is achieved with a combination of push and pull forces (with compressed air and vacuum, respectively), which are connected to the pneumatic inlets at the bottom of the cartridge. These pneumatic forces are regulated by pinch valve manifold and two pneumatic syringe pumps within the desktop unit. The performance of this pneumatic reagent delivery method was examined. We have demonstrated the capability of the on-cartridge RNA extraction and cancer-specific gene amplification from 10 copies of MCF-7 breast cancer cells. The on-cartridge DNA recovery efficiency was 54-63%, which was comparable to or better than the conventional manual approach using silica spin column. The lab cartridge would be suitable for integration with lab-chip real-time polymerase chain reaction devices in providing a portable system for decentralized disease diagnosis.