海滨沙地砂引草对沙埋的生长和生理适应对策

在2009和2010年春夏季通过对烟台海滨沙地自然生长的耐沙埋植物砂引草(Messerschmidia sibirica Linn)进行不同厚度(1/3株高-轻度沙埋、2/3株高-中度沙埋、3/3株高-重度沙埋)沙埋试验,并测定沙埋过程中土壤温度、土壤含水量、叶片鲜重(FW)、干重(DW)、植株相对高度(%)、叶片细胞膜透性、相对含水量、(丙二醛)MDA、抗氧化酶活力(过氧化物岐化酶(SOD)、过氧化物酶(POD)、过氧化氢酶(CAT))、脯氨酸、可溶性糖含量的变化以探讨砂引草抗沙埋的生长和生理调节策略,为未来砂引草的科学管理和应用提供理论指导。结果表明,在沙埋第5天、第10天,随着沙埋厚度的增加土壤温度下降,土壤含水量增加,植株相对高度和整株砂引草叶片FW和DW呈上升趋势,同一植株沙上叶片FW、DW不断增加,沙下叶片FW、DW则不断减少。在沙埋第5天,不同厚度沙埋处理的植株叶片细胞膜透性和MDA含量均较对照低,而整株植物叶片SOD、CAT活力和脯氨酸含量均较对照高。同一植株沙下叶片细胞膜透性、MDA、脯氨酸含量及SOD和CAT活力均低于沙上叶片。研究表明,轻度和中度沙埋使沙上叶片受到地面热辐射、干旱、高温胁迫影响,导致叶片内含水量下降,膜脂过氧化加强,膜受损。但同时叶片中快速激活的保护酶和积累的脯氨酸抑制膜脂过氧化可能是保护沙埋后沙上叶片能快速生长的重要生理调控机理。在重度全埋枝叶处于沙下时,沙下缺氧和黑暗抑制了叶片呼吸作用和光合作用,同时缺氧也抑制了叶片对营养物质的消耗使叶片成为茎尖生长的物质和能量供体,促使暗中茎顶端不断的延伸生长冲出沙土再生。砂引草耐全埋的再生能力进一步表明,砂引草在海岸沙丘固沙、保滩、护岸和植被恢复上将具有重要开发和应用前景。

Vascular Calcification:Where is the Cure?

With the progress of aging,the incidence of vascular calcification(VC)gradually increases,which is correlated with cardiovascular events and all-cause death,aggravating global clinical burden.Over the past several decades,accumulating approaches targeting the underlying pathogenesis of VC have provided some possibilities for the treatment of VC.Unfortunately,none of the current interventions have achieved clinical effectiveness on reversing or curing VC.The purpose of this review is to make a summary of novel perspectives on the interventions of VC and provide reference for clinical decision-making.

重大疫情期间大学生的心理健康应对策略

重大疫情是重大的社会应激事件,给大学生带来严峻的心理冲击。为促进大学生心理健康,文章从心理和生理两方面提出大学生心理健康的应对策略。大学生应主动了解疫情相关知识,从认知、情绪、控制感和价值感、生活方式、体育锻炼等方面入手,积极主动应对重大疫情对心理带来的影响。

Redox physiology in animal function:The struggle of living in an oxidant environment

A strong focus of ecological research for several decades has been to understand the factors underlying the variation in animal life-histories. In recent times, ecological studies have begun to show that oxidative stress may represent another important modulator of competitive trade-offs among fitness traits or of positively integrated patterns of traits. Therefore, incorporating mechanisms underlying oxidative physiology into evolutionary ecology has the potential to help understand variation in life-history strategies. In this review, I provide a general overview of oxidative stress physiology, and subsequently focus on topics that have been neglected in previous ecological reviews on oxidative stress. Specifically, I introduce and discuss the adaptations that animals have evolved to cope with oxidative stress; the environmental stressors that can generate changes in oxidative balance; the role of reactive species in transduction of environmental stimuli and cell signaling; and the range of hormetic responses to oxidative stress [Current Zoology 56 （6）： 687-702, 2010].

The Effects of Web-Based Listening Strategy Training on Thai High School EFL Students＇ Listening Comprehension

This study investigated the effects of a CLSTS （Computer-Assisted Listening Strategy Training Software） program on the development of students＇ ability to use four target listening strategies to enhance their listening comprehension. This study covered an experimental group and a control group. The participants were Grade 10 Thai EFL （English as a Foreign Language） students in a Thai high school in Bangkok, Thailand. Experimental group performance was compared to that of a control group on the five research instruments. Regarding the effect of the CLSTS on the students＇ ability to use the target listening strategies to enhance their listening comprehension, it was found that the CLSTS was significantly effective. The results that made CLSTS effective were categorized into six main aspects.

Problems in Nursing Service in Shanghai Single-Child Families and Countermeasures

It has been 30 years since the family planning policy had been implemented in the last 1970s. Today, the first generation of only child has already reached thirties and their parents have entered into old age so that they may confront such a dilemma situation in which they should not only look after their own child but also take care of their parents. The paper find the different demand of the aging people in different type of family through the site investigation about pension service demand in three different kinds of communities in Cao Hejing. The survey mainly make a statistical analysis in economic situation, life care and emotional solace through the on-site questionnaire and interview, finding the particularity of the only child family, sorting out the best pension service strategy for the one-child family through the analysis research and the reference of international practice.

Research on the Personalized Recommendation of Clothing Based on Rough Set Theory

With time going on, the fact that pace of life becomes faster make more and more customers pay more attention to of clothing. In order to survive and develop better and to attract more customers, enterprisesmust have the ability to provide the personalized recommendations and the implementation of differentiated business strategy. This text aims to make enterprises understand the customers＇ personalized requirement by using the data processed though questionnaire and rough set theory. And enterprises can provide production and marketing auxiliary decision-making effectively. The feasibility and practicality of rough set theory is verified through the personalized recommendationseases.

Sex-specific strategies of resource utilization and determining mechanisms of Hippophae rhamnoides in response to community succession

The dioecious plant,Hippophae rhamnoides,is a pioneer species in community succession on the Qinghai-Tibet Plateau(QTP),plays great roles in various ecosystem services.However,the males and females of the species differ both in their morphology and physiology,resulting in a change in the ratio of male to female plants depending on the environment.To further explore the functional traits critical to this sex-based distinctive response in the alpine grassland,we have surveyed the sex ratios,measured their photosynthetic parameters,height,leaf area and biomass allocation.The results showed that(i)The males had higher Pn,light saturation point,apparent quantum efficiency,A_(max) and lower water-use efficiency(WUE),which exhibited higher utilization efficiency or tolerance to strong light,while the females indicated higher utilization efficiency for low light and water.And it showed sex-specific biomass allocation patterns.(ii)H.rhamnoides populations across the successional stages all showed a male-biased sexual allocation,which was closely related to sex-specific WUE,Pn,root biomass/total biomass and root-crown ratio.(iii)The leaf traits of H.rhamnoides changed from higher N_(area),P_(area) and leaf mass per area in the early and late to lower in the middle,which meant they moved their growth strategy from resource rapid acquisition to conservation as the succession progressed.(iv)The increasing soil total phosphorus mostly contributed to regulating the sex bias of populations and variations of traits during the succession.The results are vital for the management of grassland degradation and restoration due to shrub encroachment on the QTP.

Understanding Good Language Learners’ Writing Strategy Use in the Chinese EFL Context: A Sociocultural Perspective

Strategy studies have been a well-established field in second language writing research and this article investigates English as a foreign language （EFL） learners＇ writing strategy use from a sociocultural perspective. Unlike the traditional focus on internal cognitive mechanisms in writing strategy studies, this sociocultural approach highlights the dialectic relationship between cognition and the sociocultural context and the importance of mediating resources in strategy use. Six proficient English majors from a Chinese university participated in the study, and data about their writing experience were collected through interviews. The findings showed that the participants used four types of writing strategies： artifact-mediated, rule-mediated, community-mediated, and role-mediated strategies. Other features of their strategy use include the diversity of mediating resources, idiosyncratic use of these resources, and the common goal to enhance their language knowledge and writing ability. Drawing on these findings, it is suggested that teachers can reconfigure the sociocultural context of writing activities to help students enhance their strategy use and possible ways include artifact manipulation and community construction.

Hepatic encephalopathy

Hepatic encephalopathy(HE)is a reversible syndrome of impaired brain function occurring in patients with advanced liver diseases.The precise pathophysiology of HE is still under discussion;the leading hypothesis focus on the role of neurotoxins,impaired neurotransmission due to metabolic changes in liver failure,changes in brain energy metabolism,systemic inflammatory response and alterations of the blood brain barrier.HE produces a wide spectrum of nonspecific neurological and psychiatric manifestations.Minimal HE is diagnosed by abnormal psychometric tests.Clinically overt HE includes personality changes,alterations in consciousness progressive disorientation in time and space,somnolence,stupor and,finally,coma.Except for clinical studies,no specific tests are required for diagnosis.HE is classified according to the underlying disease,the severity of manifestations,its time course and the existence of precipitating factors.Treatment of overt HE includes supportive therapies,treatment of precipitating factors,lactulose and/or rifaximin.Routine treatment for minimal HE is only recommended for selected patients.

THE DYNAMICAL BEHAVIOR OF NON-SMOOTH SYSTEM WITH IMPULSIVE CONTROL STRATEGIES

Non-smooth system including impulsive strategies at both fixed and unfixed times are analyzed. For the model with fixed impulsive effects, the global stability of pest eradi- cation periodic solution and the dominance of dynamic behavior are investigated. This indicates that the model with fixed moments has the potential to protect the natural enemies from extinction, but under some conditions may also serve to extinction of the pest. The second model is constructed according to the practices of IPM, that is, when the pest population reaches the economic injury level, a combination of biological, cultural, and chemical tactics that reduce pests to tolerable levels is used. Numerical investigations imply that there are several different types of periodic solutions and their maximum amplitudes are always less than the given economic threshold. The results also show that the time series at which the IPM strategies are applied are quite complex, which means that the application and realization of IPM in practice are very difficult.