物种和植被资源信息系统的建设及展望

着重阐述了生物物种和植被资源信息系统的基本组成和基础数据库，并简要介绍了生境评价系统的研究成果和植被资源-气候环境的空间模拟结果。     

立足地区特色培养模式下的毕业论文实践

毕业论文是高等院校实践教学中的重要环节。我们对毕业论文实践教学进行了初步的探索,旨在找出适合地方高等院校的办学模式下的生物类专业毕业论文实践教学,以提高本科生培养质量,开辟一条具有地区特色的实践之路。     

人类进化与人体美

人体是世间最美的自然存在物，也是人类第一个审美对象，人体所以是美的，因为它深深地积淀了生物进化与化进化的丰富内涵，本将从人类生物进化与化进化两个方面揭示人体美的奥秘，同时对人体美的本质作出新的理论解释。     

Hyperhydration using different hydration agents does not affect the haematological markers of the athlete biological passport in euhydrated volunteers

ABSTRACT

Athlete Biological Passport (ABP) is an indirect approach, implemented by WADA, aimed at detecting blood manipulation based on abnormal changes in haematological markers. Cases report the use of hyperhydration as masking method during anti-doping urine sample collection which could potentially mask suspicious fluctuations on ABP profiles. This study investigated the hyperhydration effect on haemoglobin concentration, reticulocyte percentage and OFF-hr score (an algorithm based on haemoglobin concentration and reticulocyte percentage), with and without recombinant human erythropoietin (rHuEPO) administration. A five-week clinical study performed; Baseline and rHuEPO Phase. Water and a sports drink were used as hyperhydration agents. To examine the hyperhydration effect on the normal ABP profile per volunteer, hyperhydration was implemented at 0, 24 and 48 hours during the baseline. During the rHuEPO phase, volunteers received Epoetin beta (3000 IU) with hyperhydration to be implemented at 0, 24 and 48 hours after drug administration. Blood and urine samples were collected and analysed according to WADA guidelines. No significant effect on ABP markers was observed due to hyperhydration at any time during the study. Pre- and post-hyperhydration data were not statistically different compared to individual baseline data. In conclusion, hyperhydration does not affect the ABP haematological markers under the examined conditions.     

How gay and bisexual men compensate for the lack of meaningful sex education in a socially conservative state

The information shared in schools on sex education in the USA is highly variable depending on the state and sometimes city in which a student lives. Gay and bisexual students living in a socially conservative, primarily rural state such as Oklahoma often receive little information about sexual health information that pertains to their behaviours unless it is discussing the dangers of sex. Using a qualitative approach, 20 gay and bisexual men currently residing in Oklahoma completed semi-structured interviews about their experiences with sex education and alternate ways to compensate for lack of information provided. Participants noted an awareness of the lack of meaningful sex education or if it was offered, a primary focus on abstinence-only until marriage heteronormative curricula. Participants described various ways they compensated for lack of sex education including accessing pornography and information from the internet. With the current socio-political environment of Oklahoma, it is unlikely wholesale changes to the sex education curricula can be made. The importance of public health professionals using the internet and peer educators to deliver inclusive and informative sexual health information remains salient and viable for men who reside in socio-politically conservative areas like Oklahoma.     

Enhancing the Transition to Kindergarten: A Randomized Trial to Test the Efficacy of the "Stars" Summer Kindergarten Orientation Program

This randomized trial tested the efficacy of an intensive, four-week summer program designed to enhance low-income children's transition to kindergarten (n's = 60 program children, 40 controls). Administered in four public schools, the program focused on social competence, pre-literacy and pre-numeracy skills, school routines, and parental involvement. Hierarchical linear modeling indicated that the program significantly improved teachers' ratings of (a) the transition to the social aspect of kindergarten for girls (but not boys); and (b) the transition to kindergarten routines for the subgroup of children who had the same teacher for kindergarten as for the summer program. Findings are discussed in terms of practices and policies for supporting children's transition to school.     

大学生性心理发展现状及对策研究

受当前多种社会因素影响,大学生的性心理发展呈现出多种矛盾性,为此,需要分析导致大学生性心理发展矛盾性的原因,并且提出相应的应对对策.     

融资约束、市场环境与企业R&D投资——基于医药生物行业上市公司实证研究

以中国生物医药行业上市公司2010年—2012年数据为样本,实证检验发现,企业RD投资与企业自身现金流量显著正相关,与股权融资正相关,与债权融资负相关,但不显著。企业所在地市场环境差异对RD投资和融资约束具有显著影响。     

我国高校毕业生劳动力市场性别差异文献评述

文章针对目前我国高校毕业生在就业过程中的性别差异问题．总结了近年来国内针对劳动力市场性别差异的相关研究,并侧重实证研究部分。归纳了性别差异的表现形式,考察性别差异的不同视角．性别差异的产生原因以及可采取的消除性别差异的措施等。旨在通过梳理国内现有的性别差异研究文献．全面了解以教育经济学领域为主并涉及多学科的一个广泛研究领域内性别差异研究的进展情况,从而为以后的研究提供参考并指出方向。     

Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities

BackgroundThis study aimed to produce carotenoids of two bacterial strains obtained and isolated from Caatinga soil in Northeastern Brazil and to evaluate their antioxidant and photoprotective activities. The morphological identification of bacteria was performed by Gram staining and molecularly confirmed through the 16S rRNA gene. The production of carotenoids was performed on two 2³ factorial designs to analyze the influence of independent variables (temperature range, luminosity, agitation, spiral presence, and bacterial isolate type) for maximum carotenoid yield. The selected condition has been transferred to a bioreactor (10L). The identification of carotenoids was performed by liquid chromatography (HPLC) and mass spectrometry (LC-MS). Antioxidant activity was determined by inhibiting the β-carotene/linoleic acid system and the effectiveness as sunscreen was measured through its sun protection factor (SPF).ResultsThe results revealed that the isolates FT-7.22 and FT-5.12 were identified as Kocuria palustris; producers of a rare C50 carotenoid sarcinaxanthin. This is the first report on the production of carotenoids by this species from the Caatinga Domain. The pigment that was obtained from the Tryptic Soy Broth (TSB) medium in the best conditions of the factorial designs (increased agitation, aeration, and light exposure) exhibited a significant increase in the carotenoid production. The isolated FT-7.22 reached a higher sarcinaxanthin concentration (112,480 μg/L), and it exhibited promising antioxidant (76.53 ± 0.09%) and photoprotective activities (SPF = 9.36 ± 0.52).ConclusionsThis study demonstrated the ability of K. palustris to produce carotenoid sarcinaxanthin with antioxidant and photoprotective activities so that it can be applied in cosmetic formulations.How to cite: Mendes-Silva TCD, Vidal EE, de Souza RFR, et al. Production of carotenoid sarcinaxanthin by Kocuria palustris isolated from Northeastern Brazil Caatinga soil and their antioxidant and photoprotective activities. Electron J Biotechnol 2021;53. https://doi.org/10.1016/j.ejbt.2021.05.004