排序方式： 共有7条查询结果，搜索用时 15 毫秒
1
1.
2.
Sevil Kurban Idris Mehmetoglu Gulsum Yilmaz 《Indian journal of clinical biochemistry : IJCB》2007,22(2):44-47
The effects of sunflower oil, olive oil, margarine, soybean oil and butter on cholesterol and triglyceride levels were investigated
in the brain of rats. Rats were fed with a diet containing 15% of the oils for a period of 8 weeks. The rats were then decapitated,
brain samples were removed, homogenized and cholesterol and TG levels were measured. Brain cholesterol and Triglycerides levels
of all animals receiving different oils were significantly higher according to the contol except TG level of animals receiving
margarine. Brain cholesterol levels of the vegetable oils were statistically higher than those receiving saturated oil. Thus,
cholesterol level of the rats fed with olive oil group was significantly higher than that of the other groups but those receiving
sunflower oil group and Triglycerides level of the animals receiving olive oil was significantly higher than that of the other
groups except animal supplemented with soybean oil. Thus, it is concluded that brain lipid levels of rats are differently
effected by various oils and mechanism of which needs to be investigated. 相似文献
3.
The study examines the effectiveness of visually enhanced instruction that emphasizes molecular representations. Instructional conditions were specified in terms of the visual elaboration level (static and dynamic) and the presentation mode (whole class and individual). Fifty‐two eighth graders (age range 14–15 years) participated in one of the three instructional conditions (dynamic–individual, dynamic–whole class, and static–whole class) designed to improve molecular understanding on chemical change. The results indicated significantly higher performance for students who used dynamic visuals compared with those who used static visuals. Furthermore, students who used dynamic visuals on an individual basis were more consistent in their use of molecular representations compared with students who received whole‐class instruction with dynamic or static visuals. The results favour the use of dynamic visuals (preferably on an individual basis) over static visuals when presenting molecular representations. The results also imply that the effectiveness of instruction will improve if teachers challenge and question the inconsistencies and contradictions between verbal explanations and corresponding molecular representations 相似文献
4.
The present study makes use of the capabilities of computerized environments to enable simultaneous display of molecular representations that correspond to observations at the macroscopic level. This study questions the immediate and long‐term effects of using a multimedia instructional unit that integrates the macroscopic, symbolic, and molecular representations of chemical phenomena. Forty‐nine eighth graders received either multimedia‐based instruction that emphasized molecular representations (n = 16), or regular instruction (n = 33). Students who received multimedia‐based instruction that emphasized the molecular state of chemicals outperformed students from the regular instruction group in terms of the resulting test scores and the ease with which they could represent matter at the molecular level. However, results relating to the long‐term effects suggest that the effectiveness of a multimedia‐based environment can be improved if instruction includes additional prompting that requires students to attend to the correspondence between different representations of the same phenomena. © 2004 Wiley Periodicals, Inc. J Res Sci Teach 41: 317–337, 2004 相似文献
5.
Ángel Abós Catalán Javier Sevil Serrano José Antonio Julián Clemente José Martín-Albo Lucas Luis García-González 《International Journal for Educational and Vocational Guidance》2018,18(2):127-148
The present study aimed to validate a Spanish-version of the Basic Psychological Needs at Work Scale (BPNWS-Sp) and to examine the associations between needs satisfaction and engagement and burnout in secondary education teachers. Using a sample of 584 secondary education teachers, the results supported the three-factor model, composite reliability, measurement invariance, and nomological validity of the BPNWS-Sp. This study contributes to validating the first instrument in Spanish to measure the satisfaction of the three BPNs separately in secondary education teachers. The measurement of teachers’ BPNs could effectively provide guidance for school policies to improve teaching and learning. 相似文献
6.
Kaya M Kaya G Kaya MD Atak M Saglam S Khawar KM Ciftci CY 《Journal of Zhejiang University. Science. B》2008,9(5):371-377
Chickpea is an important food legume crop of Turkey and is largely grown for human consumption on low moisture or salt-affected soils.The objective of the study was to find the effects of NaCl stress at electrical conductivities of 4.5,8.6,12.7 and 16.3 dS/m and seed sizes (7,8 and 9 mm) on germination and early seedling growth of three popular chickpea cultivars (AKN-97,Gokce and Uzunlu-99).Mean frequency of germination,germination time,germination index,root length,shoot length and seedling fresh weight showed seed size-dependent responses of cultivars to salt stress.In general,small seeds germinated and grew more rapidly compared to medium and large seeds of the same cultivars against all levels of salt stress,with the best results in cultivar Uzunlu-99.No effect of NaCl treatments was observed on frequency of germination; however,a drastic decrease in early seedling growth was recorded at increased NaCl concentrations.Regression analysis results showed a significantly positive rela-tionship (P<0.01) between seed size and mean germination time,whereas a significantly negative relationship was recorded between seed size and germination index,root length,shoot length.Moreover,linear regression values apparently confirmed that increased seed size in each cultivar affected decreased germination index,root and shoot lengths with enhanced mean germination time.Thus,it was concluded that the use of small seeds could considerably reduce the production costs of chickpea in salt-affected soils. 相似文献
7.
1