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Fatemeh Moghaddam Tabrizi Firouz Ghaderi Pakdel 《Indian journal of clinical biochemistry : IJCB》2014,29(2):174-180
Concentrations of various trace elements are altered during pregnancy with changes in the mother’s physiology and the requirements of growing fetus. The aim of the present longitudinal study was to learn the changes of micronutrients Iron (Fe), Calcium (Ca), zinc (Zn) Magnesium (Mg) and copper (Cu) of pregnant woman and their relations with newborns levels. Serum levels of iron, calcium, zinc, magnesium and copper of 162 pregnant women and their newborns were determined by an inductively couple plasma mass spectrometer (ICP/MS). The results showed that majority (41 %) of pregnant women were in age group 26–36 years 55 % had high school and diploma levels of education and the total income ranged between 3 and 5 Rials million per month There was significant difference in iron levels during first, second and third trimesters, 76.0 ± 17.8, 63.5 ± 15.2 and 70.1 ± 14.4 μg/dl respectively. Significant difference was shown in zinc levels 79.5 ± 15, 74.5 ± 16.1, and 65.3 ± 14.9 μg/dl during three trimesters. Copper levels during pregnancy were significantly different (130.9 ± 43.5, 172.0 ± 38.94, 193.2 ± 28.5 μg/dl. The serum levels of calcium and magnesium during pregnancy were constant (Ca: 8.96 ± 0.48, 8.86 ± 0.47, 8.91 ± 0.42 mg/dl and Mg: 2.10 ± 0.21, 2.08 ± 0.28, 2.09 ± 0.29 mg/dl). Results showed that 13 % of pregnant women had hypocalcaemia and hypomagnesaemia. Thirty eight percent and 42 % of pregnant women had iron and zinc deficiency respectively. In this study, unlike zinc, no pregnant women were found deficient in serum copper levels. Calcium, iron, zinc, copper and magnesium levels in the newborn’s cord blood were 8.93 ± 0.43, 106.0 ± 26.1, 85.35 ± 16.6, 57.04 ± 13.8 and 1.99 ± 0.27 mg/dl respectively. In the present study the levels of iron and zinc in cord blood were higher than the levels of iron and zinc in maternal serum. The mean level of copper in cord blood serum in the current study was lower than maternal values. The mean serum calcium and magnesium in the serum cord blood and in the serum of the pregnant women were similar. 相似文献
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The aim of this study was to explore the opinions, perceptions and evaluations of students about their experiences with a question–answer system used on mobile devices in a lecture-based course. Basic qualitative research method was employed in this study to understand how students made sense of their experiences during the instruction. The participants of the study were 25 of 42 students enrolled in a Computer Hardware course, who were interviewed in five sessions of focus-groups. Data analysis was done based on the six steps of inductive analysis. The results showed that students mostly ascribed the meaning of their engagement to the observable behaviors about academic challenge. Concerning inhibiting factors for participating in a lecture, they stressed the constraints of lecture method. As inhibiting factors for asking questions, they mostly stated shyness as a reason. The results of the research were discussed reflectively to investigate the constructed meanings of participants about the context and to make suggestions for further studies. 相似文献
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Lale Oral Ataç Deniz Dirik Hilmiye Türesin Tetik 《International Journal for Educational and Vocational Guidance》2018,18(1):45-61
The purpose of this study is to investigate the relationship between career adaptability and self-esteem, and analyze the moderating role of social support in this relationship on a sample of 313 young adults. The results of the study confirm that career adaptability is significantly predicted by self-esteem. Moreover, findings suggest that (1) self-esteem enhances career adaptability, (2) perceived social support positively predicts career adaptability, and (3) perceived social support plays a moderating role in the relationship between perceptions of self-esteem and career adaptability sub-scales. Self-esteem and social support positively predict young adults’ career adaptability above and beyond the effects of demographics. 相似文献
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The relationship between physics and mathematics is hardly ever presented with sufficient clarity to satisfy either physicists or mathematicians. It is a situation that often leads to misunderstandings that may spread quickly from teacher to student, such as the idea that mathematics is a mere instrument for the physicist. In this paper, we examine the historical construction of this relationship, with reference to the French philosopher Michel Paty, and we look briefly at its presence in the construction of thermodynamics. We then present the results of an empirical study on the way these relations are perceived among undergraduate students, in their last year of a university course on physics, in the discipline of Thermodynamics. The study points to significant relations between the students’ performance in terms of problem solving and the epistemic view they hold. 相似文献
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B. Barla Cambazoglu Evren Karaca Tayfun Kucukyilmaz Ata Turk Cevdet Aykanat 《Information processing & management》2007
Search Engine for South-East Europe (SE4SEE) is a socio-cultural search engine running on the grid infrastructure. It offers a personalized, on-demand, country-specific, category-based Web search facility. The main goal of SE4SEE is to attack the page freshness problem by performing the search on the original pages residing on the Web, rather than on the previously fetched copies as done in the traditional search engines. SE4SEE also aims to obtain high download rates in Web crawling by making use of the geographically distributed nature of the grid. In this work, we present the architectural design issues and implementation details of this search engine. We conduct various experiments to illustrate performance results obtained on a grid infrastructure and justify the use of the search strategy employed in SE4SEE. 相似文献
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The prejudice-reducing effects of intergroup contact have been well documented. However few studies have investigated the importance of the broader context within which contact occurs. The current study examined the predictors of social distance from Muslims in a large sample of Australian secondary school children (N = 980). Intergroup contact was an important predictor of reduced social distance even after demographics and perceptions of parents, school, media and broader intergroup dynamics were taken into account. However, in part the contact–social distance relationship was mediated by perceived parental support for intergroup relations and perceived fairness of media representation. Student's perceptions of broader group dynamics relating to collective threat and differentiation between groups impeded the relationship. The findings attest to the importance of the broader context within which contact occurs. Having contact with outgroup members leads to reduced social distance to the outgroup, however perceived norms and outgroup perceptions play a pivotal role in explaining this relationship. 相似文献
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Tablets can be used to facilitate systematic testing of academic skills. Yet, when using validated paper tests on tablet, comparability between the mediums must be established. Comparability between a tablet and a paper version of a basic math skills test (HRT: Heidelberger Rechen Test 1–4) was investigated. Five samples with second and third grade students participated. The associations between the tablet and paper version of HRT showed that these modes of administration were comparable for three arithmetic scales, but unacceptable for a pictorial counting scale. Scores were lower on tablet. Test-retest reliability for arithmetic scales on tablet was satisfactory, but was inferior for a low-performing sample. The overall convergent validity was satisfactory. No effect of test administrator was found. Arithmetic scales can potentially be transferred to tablet with good comparability and maintained test-retest reliability. Precautions are necessary when transferring pictorial scales into tablet. Separate norms for tablet are needed when interpreting scores. 相似文献
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