The PPARGC1A gene Gly482Ser in Polish and Russian athletes     

Maciejewska A  Sawczuk M  Cieszczyk P  Mozhayskaya IA  Ahmetov II 《Journal of sports sciences》2012,30(1):101-113

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Acute effects of static stretching on characteristics of the isokinetic angle - torque relationship, surface electromyography, and mechanomyography     

Cramer JT  Beck TW  Housh TJ  Massey LL  Marek SM  Danglemeier S  Purkayastha S  Culbertson JY  Fitz KA  Egan AD 《Journal of sports sciences》2007,25(6):687-698

The aims of this study were to examine the acute effects of static stretching on peak torque, work, the joint angle at peak torque, acceleration time, isokinetic range of motion, mechanomyographic amplitude, and electromyographic amplitude of the rectus femoris during maximal concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1) in men and women. Ten women (mean +/- s: age 23.0 +/- 2.9 years, stature 1.61 +/- 0.12 m, mass 63.3 +/- 9.9 kg) and eight men (age 21.4 +/- 3.0 years, stature 1.83 +/- 0.11 m, mass 83.1 +/- 15.2 kg) performed maximal voluntary concentric isokinetic leg extensions at 1.04 and 5.23 rad x s(-1). Following the initial isokinetic tests, the dominant leg extensors were stretched using four static stretching exercises. After the stretching, the isokinetic tests were repeated. Peak torque, acceleration time, and electromyographic amplitude decreased (P< or = 0.05) from pre- to post-stretching at 1.04 and 5.23 rad . s(-1); there were no changes (P > 0.05) in work, joint angle at peak torque, isokinetic range of motion, or mechanomyographic amplitude. These findings indicate no stretching-related changes in the area under the angle - torque curve (work), but a significant decrease in peak torque, which suggests that static stretching may cause a "flattening" of the angle - torque curve that reduces peak strength but allows for greater force production at other joint angles. These findings, in conjunction with the increased limb acceleration rates (decreased acceleration time) observed in the present study, provide tentative support for the hypothesis that static stretching alters the angle - torque relationship and/or sarcomere shortening velocity.  相似文献   

Detection of immunoglobulins in a laser induced fluorescence system utilizing polydimethysiloxane microchips with advanced surface and optical properties     

Schrott W  Nebyla M  Přibyl M  Snita D 《Biomicrofluidics》2011,5(1):14101

We developed an automated laser induced fluorescence system utilizing microfluidic chips for detection and quantification of immunoglobulins. Microchips were fabricated from polydimethysiloxane (PDMS) using the so-called "prepolymerization technique." The microchip structure helped minimize the effects of PDMS autofluorescence and light scattering. Furthermore, a thin and uniform PDMS layer forming the top of the microchip enabled proper focusing and collection of the excitation beam and the emitted fluorescence, respectively. The developed system was tested for the detection of mouse immunoglobulins. The capturing antibodies were immobilized on internal microchannel walls in the form of a polyelectrolyte. We clearly show that this immobilization technique, if correctly realized, gives results with high reproducibility. After sample incubation and washing, secondary antibodies labeled by fluorescein isothiocyanate were introduced into microchannels to build a detectable complex. We show that mouse antibodies can be quantified in a wide concentration range, 0.01-100 μg ml(-1). The lower detection limit was below 0.001 μg ml(-1) (6.7 pM). The developed laser induced fluorescence (LIF) apparatus is relatively cheap and easy to construct. The total cost of the developed LIF detector is lower than a typical price of plate readers. If compared to classical ELISA (enzyme linked immunosorbent assay) plate systems, the detection of immunoglobulins or other proteins in the developed PDMS microfluidic device brings other important benefits such as reduced time demands (10 min incubation) and low reagent consumption (less than 1 μl). The cost of the developed PDMS chips is comparable with the price of commercial ELISA plates. The main troubleshooting related to the apparatus development is also discussed in order to help potential constructors.  相似文献   

Heralding ideas of well-being: A philosophical perspective     

Marek Tesar  Michael A. Peters 《Educational Philosophy and Theory》2020,52(9):923-927

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Preservice Elementary School Teachers' Understandings of Theory Based Science Education     

Marek  Edmund A.  Laubach  Timothy A.  Pedersen  Jon 《Journal of Science Teacher Education》2003,14(3):147-159

Journal of Science Teacher Education -  相似文献   

Sociology of education,comparative education and social problems: A Polish comment     

Marek Zelazkiewicz 《International Review of Education/Internationale Zeitschrift für Erziehungswissenschaft/Revue internationale l'éducation》1981,27(4):471-481

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From one-stop shop to no-stop shop: An e-government stage model     

Hendrik Scholta  Willem Mertens  Marek Kowalkiewicz  Jörg Becker 《Government Information Quarterly》2019,36(1):11-26

This paper responds to two observations about current government service delivery. First, despite reasonable efforts to improve the design of forms and to establish single points of contact in one-stop shops, citizens still perceive forms as cumbersome. Second, citizens expect governments to act proactively by initiating appropriate government services themselves, instead of relying on requests for services from citizens. To address these two issues, this paper proposes a transition from a one-stop shop to a no-stop shop, where the citizen does not have to perform any action or fill in any forms to receive government services. The contribution of this paper is an e-government stage model that extends existing models. Stage models are suitable tools with which to inspire future developments, and ours extends previous models that guide progress toward the one-stop shop by describing two further stages: the limited no-stop shop and the no-stop shop. We define three dimensions along which to progress: integration of data collection, integration of data storage, and purpose of data use. We provide a first test of the model's validity through three case studies: the e-government practices in Austria, Estonia, and an Australian state government. Our work complements existing research on e-government stage models and proactive government service delivery.  相似文献   

Long-term use of learning cycles following inservice institutes     

Edmund A. Marek  Constance Haack  Lisa McWhirter 《Journal of Science Teacher Education》1994,5(2):48-55

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Correlations among cognitive development,intelligence quotient,and achievement of high school biology students     

Edmund A. Marek 《科学教学研究杂志》1981,18(1):9-14

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INTELLECTUAL ABILITIES AND DEALING WITH UNEXPECTED CHANGES IN TASK REQUIREMENTS     

Marek C. Chawarski 《High Ability Studies》1991,1(1):25-32

Intelligence is often conceptualized as concerned with coping with novelty, adapting to change, and the like: with ‘thinking’ rather than ‘knowing’. Highly intelligent people would be expected to adapt more effectively to unexpected changes. Using the method of ‘mental chronometry’, the performance of 72 seventh graders on a computer controlled reaction time experiment was measured and results compared with Raven's Matrioes IQs. The children with higher IQs were faster, more stable and more accurate in their reactions. Nonetheless, there was no simple, general tendency for children with higher IQs, to deal more effectively with change — rather, the necessity to perform additional stages of information processing seems to be less harmful for intelligent than less intelligent people.

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