Combined effects of a simulated marine heatwave and an algal toxin on a tropical marine aquaculture fish cobia (Rachycentron canadum)

Ongoing global warming is one of the major challenges for the development of aquaculture in the tropical regions where species are already cultured in the water temperature close to their upper physiological thresholds. Furthermore, warming can trigger blooms of toxic algae, yet we do not know how extreme warming such as a marine heatwave (MHW) and algal toxins may affect marine aquaculture species. To address this issue, we investigated the effects of a simulated MHW in combination with exposure to trans‐4‐trans‐decadienal (PUA), a diatom‐derived toxin, on survival, growth, development and biochemical composition of cobia larvae and juveniles. Cobia larvae were exposed for 48 hr to one of two temperatures (29 vs. 34°C) and two PUA treatments (0 vs. 0.5 µM). Surviving larvae from each treatment were divided into two subsets: three replicates were used for the feeding test and five replicates were used for the recovery test in a non‐contaminated environment at the respective temperatures of 29 or 34°C. Survival of cobia larvae was reduced by 16% in either MHW or PUA, but it dropped by 60% when both stressors were present, indicating a synergistic effect. MHW, but not PUA, reduced the feeding of cobia larvae. PUA had no delayed effects on growth rate and biochemical composition of the fish. MHW strongly reduced specific growth rate, body protein and lipid contents in cobia. Our results provide the first empirical evidence of how MHW and toxic algae may interact and challenge cobia and marine aquaculture production in tropical countries.     

基于循环经济的城乡旅游产业链构建研究

基于循环经济理论下,对城乡旅游产业链的内涵作简要的分析,并通过传统旅游产业链的扩张和延伸、城乡旅游业与关联产业的互动发展以及城乡旅游产业联动的乘数效应等3个方面来构建城乡旅游的产业链,进一步认识城乡旅游产业链的本质。     

利用BSMV Agro/LIC进行小麦条锈菌耐高温 相关基因功能分析的互作体系构建

为利用HIGS技术研究条锈菌耐高温胁迫相关基因的功能,需要构建小麦品种与条锈菌及大麦条纹花叶病毒Barley stripe mosaic virus(BSMV)亲和互作体系。本研究选用20个常温下(10℃)高感条锈病的小麦品种和22个耐高温条锈菌菌株,进行高温(21℃)条件下接种亲和性分析,发现11个品种高感条锈病、3个菌株耐高温性稳定且毒性谱较宽。在此基础上,利用含有小麦TaPDS基因片段的重组BSMV侵染上述候选小麦品种,确定‘Local Red'等6个品种与BSMV亲和程度符合试验要求。筛选出小麦品种‘Local Red'与菌株15335-2、15323-4等组成的最佳互作组合,适合利用BSMV Agro/LIC方法开展小麦条锈菌耐高温相关基因功能的研究。     

基于人工智能的小麦高效育种信息交互系统构建

小麦是人类社会重要的粮食资源之一,因此基于人工智能技术构建高效育种信息交互平台对于高质高产的小麦种植具有重要的战略价值。高效育种信息交互平台的搭建关键在于核心数据的准确识别与分类,基于此该研究提出了一种Naive Bayes（朴素贝叶斯）-AdaBoost策略,应用于小麦育种信息数据的分类与识别,并实现构筑交互平台。在该策略中AdaBoost主要用于对Naive Bayes的弱分类器进行迭代,形成强分类器,同时过滤并优化核心词汇,达到提高分类识别准确度的目的。结果显示,与传统Naive Bayes方法相比该方法准确率提高了12.2个百分点,识别的准确率达到99.2%,而此时基于Naive Bayes、决策树、支持向量机3种方法的准确率分别为87.0%、86.6%和85.6%。结果表明,该研究所提方法在面对复杂数据分类识别的场景中具有较大的应用潜力。     

A web‐based approach to improve collation and communication of complex soil‐landscape data with examples relating to agricultural production,environmental degradation and mineral exploration

This paper provides examples of how to use web‐based techniques to organize and communicate large quantities of complex and varied soil and landscape data. It describes a straightforward method for creating an interactive, web‐based data site that can be used to facilitate more rapid and effective communication between project staff (scientists and managers) and clients (farmers and land managers). This can facilitate teleconferences between team members and be used to communicate information and ideas. Consequently, it reduces costs associated with travel and makes it easier to interpret data during collection. The web‐based data site can be used to deliver easily understood final reports to clients that may have limited background knowledge in a particular area. Additionally, it provides a sufficiently logical and intuitive user interface for use by a wide range of end‐users including farmers, land managers, policy makers and the general public. This approach has been used successfully to provide a framework to coordinate and report on the large quantities of complex data generated during the following three diverse projects: (i) a study of base metal exploration methods in an area impacted by mining and land clearance in the Mount Lofty Ranges in South Australia, (ii) acid drainage issues impacting on agricultural production in the Wheatbelt of Western Australia and (iii) inland acid sulphate soils impacting on land degradation and water quality in wetlands adjacent to the River Murray in the Riverland region of South Australia.     

期刊阅览室人性化管理与读者互动服务的探讨

高校期刊阅览室是广大师生获取现代知识信息的重要场所之一,在图书馆占有重要的地位。在读者服务工作中,人性化管理是图书馆服务的发展方向,是现代高校图书馆管理的新理念。探讨了通过人性化管理与读者互动服务的实施,达到满足读者快捷、多元化的需求,从而提升图书馆管理水平和服务质量。     

一种基于用户分级的高效云存储策略

群众路线的认识论是交互认识论，强调了“干-群”双主体之间的对等性、互动性和主体性原则，因而彰显了群众的主体性地位，摒弃了主客体对立的认识论思路，是历史唯物主义在认识论与本体论、辩证法上相一致的表达。通过交互认识，领导与群众形成共同知识与共同信念，在一个不断信息更新、信念修正、信息域和知识域增大的动态过程中，实现领导与群众的利益与责任的一致、手段与目标的一致。     

粮食烘干现场智能交互监控系统

基于组态王,集成PLC、单片机和无线模块,开发出一套粮食烘干现场智能交互监控系统,实现即时采集烘干各环节数据,并可进行部分智能判断,为操作员高效作业提供极大便捷,大大推进了粮食烘干系统自动化发展。     

植物嫁接砧木与接穗互作机制研究进展

优良砧木或接穗可以显著促进嫁接植物生长,提高其抗逆性及果实产量和品质,是一种绿色安全可持续的方法。文章综述了植物嫁接后砧木与接穗在养分和水分吸收、激素调节、应激响应、嫁接亲和性以及RNA长距离运输、DNA甲基化等方面的相互作用及基因表达的响应机制,可为后续深入研究砧穗互作机制提供借鉴。     

乡村振兴视角下基层政府与农民互动机制研究

基层政府是乡村振兴政策的执行者,农民是乡村振兴的受益者和参与者。要真正实现乡村振兴,需要在基层政府与农民之间建立良性的互动机制。通过案例研究和实证分析,基于对河北省秦皇岛市B区街道办事处行政人员及管辖区域内10个村庄的农民进行调研,发现基层政府硬性推行政策、基层行政人员责任意识不足导致基层政府互动低效性,而农村人口空心化严重、农民互动意识淡薄、农民互动能力不足使得农民缺乏互动意愿。因此,从重视对农民互动能力的培养、强化基层行政人员责任意识、实施基层情治、构建基层政府与农民互动平台和健全基层政府考核评价机制等五个方面提出优化互动机制的对策。