Effects of an acute bout of exercise on serum soluble leptin receptor (sOB-R) levels

Abstract

We investigated the effects of an acute bout of exercise on serum soluble leptin receptor (sOB-R) concentrations. Eighteen male participants completed two different exercise sessions with intensities of 25% and 65% maximal aerobic capacity (VO₂max). In addition to the energy expenditure during exercise sessions being measured, blood samples were collected before exercise, and immediately, at 24 h, and at 48 h post-exercise to analyse sOB-R, leptin and insulin levels. At 24 h post-exercise, sOB-R and leptin concentrations at the 65% VO₂max were significantly different from those at the 25% VO₂max. Leptin levels at 48 h post-exercise were also significantly lower for the 65% VO₂max than for the 25% VO₂max (P < 0.01). In the 65% VO₂max session, the energy expenditure during exercise was significantly associated with leptin concentrations at 24 h and 48 h and sOB-R concentrations at 24 h post-exercise. However, no correlations were found between sOB-R and leptin at the three post-exercise time points. In conclusion, an acute bout of exercise with 920 kcal of output resulted in an increase in sOB-R levels at 24 h post-exercise. However, the changes in sOB-R levels due to an acute bout of exercise might not contribute to the delayed decrease observed for leptin.     

以CEFR为基础之华语文初级能力测验研发与应用

近年来,随着华语文学习需求的日益升高,使得以“母语为非华语者”的华语文能力测验也逐渐受到各国瞩目,然而,这些华语文能力测验仍有一些限制与不足之处。本研究目的是以欧洲语言共同参考架构（The Common European Framework of Reference,CEFR）为基础,参考蔡雅熏（2009）编制的《华语文能力指标》,研发A2级的华语文听力与阅读测验,并导人现代测验理论（item response theory,IRT）之技术,建立一套具有信度、效度的华语文能力计算机化测验。最后,本文透过次级量尺分数估计方法,探讨受试者在CEFR中四种语言能力之表现,研究显示受试者表达与理解能力优于互动与转述能力。     

An Exploratory Study of Minority Students’ Technology Usage and Perceptions of Technology: Nontraditional Adult Students in Technology-Based Environments

Abstract

The study examines nontraditional, African-American adult students’ use of technologies and their perceptions toward this in technology-based environments. Technology perceptions included computer self-efficacy, Internet self-efficacy, user attitude, and computer anxiety. The effects of student characteristics on these factors and the relationships between these factors were examined throughout this study. Participants included minority students who participated in face-to-face or online undergraduate courses offered in continuing education. A quantitative approach was undertaken to analyze the collected data. Results indicated that nontraditional minority students utilized basic software tools more frequently than the advanced ones, suggesting that many of them may lack the knowledge or skills for advanced technologies. Age, hours spent online, and previous online course experiences influenced students’ technology perceptions. Gender did not have an impact on technology perceptions. Internet self-efficacy was affected by most of the student characteristics variables. Computer self-efficacy was found to be a good predictor for both user attitude and computer anxiety. (Keywords: technology usage, technology perceptions, student characteristics, computer and Internet self-efficacy, minority students)     

Probing primordial gravitational waves: Ali CMB Polarization Telescope

In this paper, we will give a general introduction to the Ali CMB Polarization Telescope (AliCPT) project, which is a Sino–US joint project led by the Institute of High Energy Physics and involves many different institutes in China. It is the first ground-based Cosmic Microwave Background (CMB) polarization experiment in China and an integral part of China''s Gravitational-wave Program. The main scientific goal of the AliCPT project is to probe the primordial gravitational waves (PGWs) originating from the very early Universe. The AliCPT project includes two stages. The first stage, referred to as AliCPT-1, is to build a telescope in the Ali region of Tibet at an altitude of 5250 meters. Once completed, it will be the highest ground-based CMB observatory in the world and will open a new window for probing PGWs in the northern hemisphere. The AliCPT-1 telescope is designed to have about 7000 transition-edge sensor detectors at 95 GHz and 150 GHz. The second stage is to have a more sensitive telescope (AliCPT-2) with more than 20 000 detectors. Our simulations show that AliCPT will improve the current constraint on the tensor-to-scalar ratio r by one order of magnitude with three years'' observation. Besides the PGWs, AliCPT will also enable a precise measurement of the CMB rotation angle and provide a precise test of the CPT symmetry. We show that three years'' observation will improve the current limit by two orders of magnitude.     

Indigenous Crisis Counseling in Taiwan: An Exploratory Qualitative Case Study of an Expert Therapist

In this study, we adopted a single qualitative case study method to explore and examine indigenous approaches to crisis counseling in Taiwan, through the distinct lens of an expert Taiwanese counseling psychologist. In-depth, open-ended interviews were conducted with the psychologist (as the case) to document her lived clinical experiences counseling a grief-stricken Taiwanese family in crisis (as the context). Using open-code data analysis, five cultural themes were abstracted from the interviews: a) significance of counselor’s authority and expertness; b) primacy of client-counselor rapport and relationship; c) centrality of collective familism; d) observance of indigenous grief response and process; and e) adherence to face-saving communication and interpersonal patterns. Implications for implementing crisis counseling practice and research with native Taiwanese/Chinese clients based on these preliminary findings are discussed.     

元代河北书院述论(上)

由于理学北传以及元朝政府对书院扶持政策等各种因素的促动,元代河北书院处于上升状态,不仅数量骤增,而且涌现了以封龙书院为代表的一些著名书院。此期河北书院不仅传播理学及经史道德,而且也实施科技教育,培养专门人才,由此体现了其与南方书院以程朱理学及科举考试为中心的别样特色。     

福建平潭大风气候特征分析

平潭是福建省最大岛屿,处于东亚季风区,是东、西风带交替影响的过度区,其气候季节性特征明显.通过对平潭本站建站初期到2010年的气候资料进行统计分析,结果显示：平潭年平均风速为5.0 m/s,大风日主要集中出现在冬半年,而受热带气旋的影响,大风极值多出现在夏季;平潭主导风向轴明显,夏季盛行西南风,冬季盛行东北风.     

Oral conjugated linoleic acid supplementation enhanced glycogen resynthesis in exercised human skeletal muscle

Present study examined the effects of conjugated linoleic acid (CLA) supplementation on glycogen resynthesis in exercised human skeletal muscle. Twelve male participants completed a cross-over trial with CLA (3.8 g/day for 8 week) or placebo supplements by separation of 8 weeks. CLA is a mixture of trans-10 cis-12 and cis-9 trans-11 isomers (50:50). On experiment day, all participants performed 60-min cycling exercise at 75% VO₂ max, then consumed a carbohydrate meal immediately after exercise and recovered for 3 h. Biopsied muscle samples from vastus lateralis were obtained immediately (0 h) and 3 h following exercise. Simultaneously, blood and gaseous samples were collected for every 30 min during 3-h recovery. Results showed significantly increased muscle glycogen content with CLA after a single bout of exercise (P < 0.05). Muscle glucose transporter type 4 expression was significantly elevated immediately after exercise, and this elevation was continued until 3 h after exercise in CLA trial. However, P-Akt/Akt ratio was not significantly altered, while glucose tolerance was impaired with CLA. Gaseous exchange data showed no beneficial effect of CLA on fat oxidation, instead lower non-esterified fatty acid and glycerol levels were found at 0 h. Our findings conclude that CLA supplementation can enhance the glycogen resynthesis rate in exercised human skeletal muscle.     

我国主要禾本科植物幼苗发育基本类型与系统分类

本文在观察了代表22个族76个属的203种禾本科植物幼苗的发育过程和 各种性状的基础上，探讨了重要性状的形成与分布区、生境条件的关系及重要性 状之间的相关性。  根据胚轴和根系发育的不同形式，将禾本科幼苗划分为三大 型：竹型、狐茅型和黍型。根据苗叶和不定根的特点，又把这些大型分为七个 亚型：真竹亚型、稻亚型、芦竹亚型、针茅亚型、狐茅亚型、画眉草亚型和真黍亚 型。  经过与胚体和植株各方面数据的互相印证，证明与幼苗形态的七个亚型相 对应，在系统分类上是七个亚科：竹亚科、稻亚科、芦竹亚科、针茅亚科、狐茅亚科、画眉草亚科和黍亚科。