排序方式： 共有12条查询结果，搜索用时 484 毫秒
1.
Shinichi Demura Shunsuke Yamaji Fumio Goshi Hidetsugu Kobayashi Susumu Sato Yoshinori Nagasawa 《Journal of sports sciences》2002,20(2):153-164
The aims of this study were to assess the reliability and validity of three methods of bioelectrical impedance analysis (based on induction between the hand and foot, between one foot and the other foot and between one hand and the other hand) and the skinfold method, and to construct prediction equations for total body density by examining cross-validity in young Japanese adult males. The participants were 50 Japanese males aged 18-27 years (height 1.72 +/- 0.06 m, body mass 64.9 +/- 9.0 kg; mean +/- s), each of whom was measured twice using each of the four methods. Relative body fat based on underwater weighing was used as the criterion for validity. To construct prediction equations for body density, we used multiple regression analysis, whereby all possible combinations were examined. The reliability of all three bioelectrical impedance methods was high (R = 0.999). Three new prediction equations were constructed for the hand-foot method, foot-foot method and skinfold method. The cross-validity of the equations was guaranteed. The relative body fat calculated using the new equations did not differ from that based on the underwater weighing method. 相似文献
2.
Yoshihiro Okamoto Tomoyo Mita Testuri Kodama Yoshimitsu Gotoh Naoya Fujita Takashi Fukui Toshiyuki Masuzawa 《Indian journal of clinical biochemistry : IJCB》2015,30(3):351-356
We measured serum soluble vascular endothelial growth factor receptor 1 (sVEGFR1) and receptor 2 (sVEGFR2) levels in healthy Japanese individuals in order to establish a reference value using a specific ELISA. Significant differences were observed in serum sVEGFR1 and sVEGFR2 levels between children and adults. To demonstrate the usefulness of the reference value for children, we measured serum sVEGFR1 and sVEGFR2 levels in children with diarrhea positive (D+) hemolytic uremic syndrome (HUS) as a preliminary study. Serum sVEGFR2 levels in children with HUS were markedly higher than those in healthy children from the onset of D + HUS. The reference value for healthy children in the present study will allow normal and pathological conditions to be discriminated from each other in future study 相似文献
3.
Christie Kodama Beth St. Jean Mega Subramaniam Natalie Greene Taylor 《Information Retrieval》2017,20(5):403-432
Although youth are increasingly going online to fulfill their needs for information, many youth struggle with information and digital literacy skills, such as the abilities to conduct a search and assess the credibility of online information. Ideally, these skills encompass an accurate and comprehensive understanding of the ways in which a system, such as a Web search engine, functions. In order to investigate youths’ conceptions of the Google search engine, a drawing activity was conducted with 26 HackHealth after-school program participants to elicit their mental models of Google. The findings revealed that many participants personified Google and emphasized anthropomorphic elements, computing equipment, and/or connections (such as cables, satellites and antennas) in their drawings. Far fewer participants focused their drawings on the actual Google interface or on computer code. Overall, their drawings suggest a limited understanding of Google and the ways in which it actually works. However, an understanding of youths’ conceptions of Google can enable educators to better tailor their digital literacy instruction efforts and can inform search engine developers and search engine interface designers in making the inner workings of the engine more transparent and their output more trustworthy to young users. With a better understanding of how Google works, young users will be better able to construct effective queries, assess search results, and ultimately find relevant and trustworthy information that will be of use to them. 相似文献
4.
The article presents a productivity analysis of Japanese wheat breeding research. We first estimate a hedonic function to determine the marginal implicit values of Japanese wheat characteristics and find that protein contributes substantially to millers’ price offers to farmers. Induced innovation theory implies breeders thus should be responding to new protein-oriented price policies by developing high-protein wheat varieties. We test this hypothesis by estimating a distance function relating breeding resources – including what we call gene-recharge rates – to the yield and protein characteristics of discovered varieties. New varieties indeed have been protein-favoring and yield-disfavoring, suggesting government research programs have been market-oriented. 相似文献
5.
Asha K. Jitendra Jon R. Star Michael Rodriguez Mary Lindell Fumio Someki 《Learning and Instruction》2011,21(6):731-745
This study investigated the effectiveness of an instructional program (schema-based instruction, SBI) designed to teach 7th graders how to comprehend and solve proportion problems involving ratios/rates, scale drawings, and percents. The SBI program emphasized the underlying mathematical structure of problems via schematic diagrams, focused on a 4-step procedure to support and monitor problem solving, and addressed the flexible use of alternative solution strategies based on the problem situation. Blocking by teacher at three middle schools, the authors randomly assigned the 21 classrooms to one of two conditions: SBI and control. Classroom teachers provided the instruction. Results of multilevel modeling used to test for treatment effects after accounting for pretests and other characteristics (gender, ethnicity) revealed the direct effects of SBI on mathematical problem solving at posttest. However, the improved problem solving skills were not maintained a month later when SBI was no longer in effect nor did the skills transfer to solving problems in new domain-level content. 相似文献
6.
7.
8.
Spheroids that are formed from aggregated cells have enhanced biological function compared to individual cells. In particular, hetero-spheroids composed of different types of cells, such as hepatocytes and endothelial cells, express tissue specific functions at a high level, which is advantageous for more precise drug screening and biological research. In this study, we propose rapid formation of size-controlled three-dimensional hetero-cell aggregates consisting of hepatocytes and endothelial cells using micro-rotation flow. Based on previous data, these aggregates are expected to ultimately become hetero-spheroids. The hepatocytes are coated with collagen gel films less than 200 nm thick, which were experimentally verified to increase adhesion strength between hepatocytes and endothelial cells. Gel-coated hepatocytes and endothelial cells are collected in an array by micro-rotational flow, thereby forming hetero-cell aggregates within 2 min. This array allowed the size of the three-dimensional cell aggregates to be hydrodynamically controlled, with standard deviations of less than 19%, by varying the cell density of the medium without altering the device geometry. Endothelial cells were successfully and uniformly dispersed in the aggregates. The proposed microfluidic device, with its capability of rapidly forming size-controlled hetero-cell aggregates, will offer an efficient experimental platform for future hetero-spheroid study that will contribute to drug screening and regenerative medicine. 相似文献
9.
Measuring student response to interventions has become an important role for school psychologists. Children with Attention‐Deficit/Hyperactivity Disorder (ADHD) are frequently treated with stimulant medication, but the response to the treatment is rarely adequately assessed. The current study examined the sensitivity of measures used to assess the outcomes of stimulant medication for children identified with ADHD using meta‐analytic procedures. A total of 812 articles were reviewed with 35 being selected for the study based on a common treatment protocol of .3 to .5 mg/kg with a 2‐ to 8‐week pre‐ and post‐test interval. Measures were categorized as behavioral, psychological, or physiological. A total of 81 effect sizes were computed with a total unbiased estimate of effect of .53 and unbiased estimates of effect of .11 for physiological measures, .38 for psychological measures, and .56 for behavioral measures. Tests of homogeneity found nonsignificant results within each of the three categories. © 2009 Wiley Periodicals, Inc. 相似文献
10.
Inthe 196 0′stheUSAirForcedidextensivere searchesontheno handscontrolforpilotsusingbrainwaves.Theseresearcheswerenotworkedoutbecausethehumanbrainelectricalactivitywasundetectablysmall[1] .Forinstance ,Yogaadeptsandotherdisciplinedmedita torscangofromanalertstatetothemeditative“Alpha”statethroughchangingelectroencephalogram(EEG)fromthemostlyirregularandhigherfrequencyfluctuationstothelargelystablewaveoutputaround 10Hz,butittakeseventhebestpractitionersseveralsecondstoperform .Al thoughso… 相似文献