一类多分子生化反应系统模型的定性分析

对一类生化反应系统模型进行定性分析,得到了系统解的有界性与极限环不存在的充分条件。     

Carbon sinks in urban public green spaces under carbon neutrality: A bibliometric analysis and systematic literature review

Urban green spaces play essential roles in regulating the global carbon cycle and reducing carbon dioxide (CO₂) emissions. However, research on the carbon sequestration efficiency of urban public green spaces, which is closely related to the human settlement environment, has not received enough attention. Thus, we systematically analyzed the existing literature in the Web of Science core database using bibliometrics and network analysis combined with the CiteSpace visualization tool. The aim of this review was to elucidate the focus and development trend of research conducted between 2007 and 2022 on carbon sinks in urban public green spaces. Our results demonstrated that: 1) Numbers of related publications are increasing annually, indicating that the subject is receiving increasing global attention. Related research topics primarily focus on two aspects: carbon sink measurement methods and sustainable carbon sink design for urban public green spaces. 2) Methods for measuring and monitoring carbon sinks in the urban public green spaces include sample plot measurement, the assimilation method, the micrometeorological method, the remote sensing (RS) estimation method, and laboratory work. Most methods follow the forestry system approach and lack the methods and techniques to directly assess the carbon sink effectiveness of urban public green spaces. 3) Key factors affecting the carbon sink capacity of urban public green spaces are: plant species selection, plant community structure, green space characteristics, and maintenance management. 4) Future research should focus on encouraging public participation in the design of sustainable carbon sinks in urban public green spaces, advancing biodiversity research on carbon sinks in urban public green spaces, and enhancing the precision of measurements while addressing regional differences. This study contributes to the integration of research on the effectiveness of carbon sinks in urban public green spaces and provides a theoretical reference and guidance reduces prospective urban emission and achieves climate goals.     

Duality in Multiple-Objective Optimization Involving Generalized F-invexity

This paper studies the duality of the Multiobjective optimization problem involving generalized F-invex functions in Banach space. The constraint qualification and lemma 1 are introduced. The Wolfe type of duality and Mond-Weir type of duality are obtained. Strong and weak duaity theorems and other results are given under weaker F- invexity assumptions.     

Demographic and spatial variables associated with spending time in nature during COVID-19 lockdowns

To stop the spread of SARS-CoV-2 coronavirus (COVID-19) governments around the world implemented lockdowns restricting public travel. In the Australian state of Victoria, this included limiting permitted reasons for leaving home and restricting movements to within a 5 km radius of one’s home. In 2020, we conducted a state-wide survey (N = 1024) of Victorians that coincided with a lockdown. We asked respondents where they had spent time in nature and how they perceived lockdowns affected the amount of time they spent in nature. We then considered demographic and spatial predictors of spending more or less time in nature. Women, younger people, and those living in areas with higher socio-economic status were likely to report spending more time in nature. Closer proximity of residents to parks and waterways and higher proportional area of native vegetation within a 1-km radius were also associated with more time in nature. Understanding how different groups were affected by restrictions on access to nature can help improve government management of crises like pandemics, including through urban planning for green space, supporting improved individual and societal resilience. We discuss the implications of our findings for improving access to nature during lockdowns as well as opportunities for a post-pandemic relationship with nature, particularly in urban settings.     

新形势下中国种业市场的机遇与挑战

中国是传统农业大国,粮食问题一直备受关注,作为粮食产业的源头支柱——种子产业,对国民经济的发展举足轻重。针对新时期中国种业市场实际情况,从种业市场现状、市场面临的问题、市场潜力以及种子企业应对措施等方面逐一分析,并对整个市场进行了趋势预测,以为行业决策提供参考。     

河南省花生品种更新存在的问题及对策

阐述了建国以来，河南省花生生产中品种的六次更新过程，分析了当前河南花生生产中存在的问题，并提出了具体建议，以期对河南省花生产业的发展提供对策。     

生物工程专业开设综合性实验课程的探索和实践

从课程设置的必要性、实验内容的选择、课程的实施等方面对开设生物工程专业综合性实验课程进行了系统阐述,最后结合实例介绍了具体的课程体系组成及教学体会。     

复方非泼罗尼滴剂对犬蜱虫感染的治疗试验

为验证复方非泼罗尼滴剂按推荐剂量使用对犬蜱虫病的治疗效果,从北京市和海口市各收集60例自然感染病例犬,随机分配到A组和B组,A组为试验药物组(复方非泼罗尼滴剂),B组为对照药物组(福莱恩增效滴剂),每组60只,各组试验犬按推荐剂量接受治疗,在用药0 d、用药后1、2、3、4、5、6、7、10、14、21、28、35 d...     

不同营养液配方对工业大麻幼苗生长的影响

工业大麻作为一种重要的经济作物在世界上被广泛种植,在纺织、油用、建材、保健和医药方面具有较高的利用价值.水培工厂化生产是工业大麻产业发展的一个趋势,但关于适合工业大麻生长的专用水培营养液配方及浓度尚未报道.为获得适合工业大麻生长的专用水培营养液配方,利用标准霍格兰营养液(1 H)和根据工业大麻需肥规律自主设计的不同浓度...     

Extension of shelf life of tuberose flowers using a combination of gamma irradiation and generally regarded as safe (GRAS) preservatives and assessment of antimicrobial potency of senesced flowers

Tuberose cut flowers, available as loose flowers, were treated with gamma (γ) irradiation and generally regarded as safe (GRAS) preservative solutions for extension of shelf life. The flowers were packaged in low-density polyethylene bags, heat sealed and stored at 23 ± 2°C, 80% relative humidity (RH) and 4 ± 1°C, 40% RH, respectively. The flowers stored at these two temperature regimes were subjected to sensory evaluation and biochemical analyses. From these assessments, the longest shelf life of tuberose flowers was found to be 8 days at 23 ± 2°C, 80% RH (compared to 4 days for control) and 24 days at 4 ± 1°C, 40% RH (compared to 8 days for control) using combination treatment of low dose γ-irradiation (0.02 kGy) and preservative solutions (4% sucrose and 0.02% CaCl₂). Ethanolic extract of tuberose flowers of the most shelf stable set (stored at 4 ± 1°C), i.e. at the end of 24 days, showed antimicrobial potency against the common skin pathogen Staphylococcus aureus (ATCC 25923 and MDR strains), suggesting utility of the senesced tuberose flowers for therapeutic applications. This preservation technique would promote export of tuberose flowers by extension of their shelf lives and allow utilization of these flowers, post senescence.