A Case Study of Construction of Special Database on Urban Agriculture in Library of Beijing University of Agriculture

With the development of urban agriculture and digital library, the theoretical research and exploitation of special database on urban agriculture has become an inevitable trend. On the basis of analyzing the advantages of the special database on urban agriculture constructed by the library of Beijing University of Agriculture, the author has analyzed the status and the problems of the special database on urban agriculture developed by Beijing University of Agriculture and proposed the development path of special database on urban agriculture.

Analysis of Influencing Factors on Fruit Consumption of Urban and Rural Residents in Beijing

In light of the rapid expansion of China s economy,there has been a notable shift in the consumption patterns of urban and rural residents.This is evident in the increased consumption of agricultural products,with fruit consumption representing a particularly pronounced trend.The 2023 Beijing Consumption Statistics indicate that demand for fruit is increasing,accompanied by heightened competition for quality and brands.The paper is based on research that examines the current situation of fruit consumption among urban and rural residents in Beijing.The results indicate that when urban and rural residents in Beijing purchase fruits,price is the most significant factor influencing fruit consumption.Taste,appearance,and variety are also considered to be important influencing factors,while the influence of factors such as fruit type,consumption pattern,and fruit brand is relatively minor.

Research on the Development of Smart Animal Husbandry in Beijing

With the rapid development of agricultural science and technology,animal husbandry,as an important pillar in the field of agriculture,is gradually moving towards a new era of smart animal husbandry with the deep integration of informatization and digitalization.This transformation not only breaks through the traditional production mode of animal husbandry,but also promotes it to a new form under the Internet ecology,draws a new blueprint for the development of agriculture and animal husbandry,and gives birth to numerous potential business opportunities for the development of new agriculture.However,the practice and promotion of smart animal husbandry is not a smooth road,and many challenges and problems need to be solved urgently.On the basis of an in-depth investigation of the development status of smart animal husbandry in Beijing,this paper comprehensively analyzes the current problems,including the difficulty of technology integration,the lack of talent reserve,and the need to improve the policy environment.In view of these problems,it puts forward a series of practical suggestions,in order to speed up the development of animal husbandry in Beijing to the direction of smart development,and realize the sustainable development of animal husbandry.

Optimization of Agricultural Industrial Structure in Changping District of Beijing Based on Grey Relational Analysis

In the economic development of Beijing,although the share of the total amount of agricultural industry in the overall economy is relatively low,it has an important impact on the daily life of residents,social stability and the development of other industries.Changping District,as an important agricultural production base of Beijing,its agricultural development has an indispensable strategic significance for the stability and growth of the entire regional economy.Therefore,it is very important to study the structure of agricultural industry in Changping District.Based on the detailed analysis of the agricultural industrial structure of Changping District,this paper uses the grey relation theory to analyze the different industries in the agricultural industrial structure of Changping District,including planting,forestry,animal husbandry,fishery and agricultural,forestry,service industries,in order to reveal the impact of these industries on the agricultural industrial structure of Changping District.Through this study,it comes up with specific and feasible suggestions for the optimization of agricultural industrial structure in Changping District,and provides valuable reference for the agricultural development of other areas in Beijing.

Research on the Value Positioning of University Library Based on Customer Delivered Value

With the rise of various new reading media and the rapid development of the digitization of paper resources,the traditional function positioning of university libraries based on information query is facing unprecedented challenges.How to deal with the change of social information?The library should be demand-oriented,re-examine its own value and find a new starting point.With the help of the concept of customer delivered value and based on 4P theory,this paper constructs the value chain of university library from the dimensions of product,image,personnel and service,and forms a multi-dimensional development positioning system.

Environmental dynamics of nitrogen and phosphorus release from river sediments of arid areas

Human activities lead to the accumulation of a large amount of nitrogen and phosphorus in sediments in rivers.Simultaneously,nitrogen and phosphorus can be affected by environment and re-enter the upper water body,causing secondary pollution of the river water.In this study,laboratory simulation experiments were conducted initially to investigate the release of nitrogen and phosphorus from river sediments in Urumqi City and the surrounding areas in Xinjiang Uygur Autonomous Region of China and determine the factors that influence their release.The results of this study showed significant short-term differences in nitrogen and phosphorus release characteristics from sediments at different sampling points.The proposed secondary kinetics model(i.e.,pseudo-second-order kinetics model)better fitted the release process of sediment nitrogen and phosphorus.The release of nitrogen and phosphorus from sediments is a complex process driven by multiple factors,therefore,we tested the influence of three factors(pH,temperature,and disturbance intensity)on the release of nitrogen and phosphorus from sediments in this study.The most amount of nitrate nitrogen(NO_(3)^(–)-N)was released under neutral conditions,while the most significant release of ammonia nitrogen(NH_(4)^(+)-N)occurred under acidic and alkaline conditions.The release of nitrite nitrogen(NO_(2)^(-)-N)was less affected by pH.The dissolved total phosphorus(DTP)released significantly in the alkaline water environment,while the release of dissolved organic phosphorus(DOP)was more significant in acidic water.The release amount of soluble reactive phosphorus(SRP)increased with an increase in pH.The sediments released nitrogen and phosphorus at higher temperatures,particularly NH_(4)^(+)-N,NO_(3)^(–)-N,and SRP.The highest amount of DOP was released at 15.0℃.An increase in disturbance intensity exacerbated the release of nitrogen and phosphorus from sediments.NH_(4)^(+)-N,DTP,and SRP levels increased linearly with the intensity of disturbance,while NO_(3)^(–)-N and NO_(2)^(–)-N were more stable.This study provides valuable information for protecting and restoring the water environment in arid areas and has significant practical reference value.

Characteristics of long-distance mobile mRNAs from shoot to root in grafted plant species

Thousands of long-distance mobile mRNAs were identified from different grafting systems,based on high-throughput sequencing technology.Moreover,the long-distance delivery of RNAs was proved to involve multiple mechanisms.Here,we analyzed the homology,motif,and tRNA-like structure(TLS)of long-distance mobile mRNAs identified by RNA-seq as well as the RNA-binding protein(RBP)in nine grafting combinations including Arabidopsis thaliana,Vitis vinifera,Cucumis sativus,Citrullus lanatus,Nicotiana benthamiana,Malus domestica,Pyrus spp.,Glycine max and Phaseolus vulgaris.Although several mRNAs were found to be shared in herbaceous,woody,and related species,the vast majority of long-distance mobile mRNAs were species-specific.Four non-specific movement-related motifs were identified,while the TLS was not necessary for mRNA long distance mobility.In addition,we found that RBPs were conserved among herbaceous and woody plants as well as related species.This paper reports a further in-depth analysis of the endogenous mechanisms by which the species-specific transportable m RNAs were selected by bioinformatics,in order to provide insights for future research on long-distance mobile mRNAs.

Characteristics of soil seed bank in plantation forest in the rocky mountain region of Beijing, China

We investigated characteristics （scales and composition） of soil seed banks at eight study sites in the rocky mountain region of Beijing by seed identification and germination monitoring. We also surveyed the vegetation communities at the eight study sites to explore the role of soil seed banks in vegetation restoration. The storage capacity of soil seed banks at the eight sites ranked from 766.26 to 2461.92 seeds·m？2. A total of 23 plant species were found in soil seed banks, of which 63–80% of seeds were herbs in various soil layers and 60% of seeds were located in the soil layer at 0–5 cm depth. Biodiversity indices indicated clear differences in species diversity of soil seed banks among different plant communities. The species composition of aboveground vegetation showed low similarity with that based on soil seed banks. In the aboveground plant community, the afforestation tree species showed high importance values. The plant species originating from soil seed banks represented natural regeneration, which also showed relatively high importance values. This study suggests that in the rocky mountain region of Beijing the soil seed banks played a key role in the transformation from pure plantation forest to near-natural forest, promoting natural ecological processes, and the role of the seed banks in vegetation restoration was important to the improvement of ecological restoration methods.

Preliminary Study on Spatial Variability and Distribution of Soil Available Microelements in Pinggu County, Beijing, China

The objectives of this study were to explore the spatial distribution of soil available microelements and to provide a firm foundation for scientifically formulated fertilizer. 1 076 soil samples were collected from Pinggu County of Beijing, China, and the contents of available Cu, Zn, Fe, and Mn in topsoil （0-20 cm） and subsoil （20-40 cm） were analyzed respectively. Descriptive statistics and geostatistics were used to analyze the data. The mean values of topsoil available Cu, Zn, Fe, and Mn were 1.96, 2.51, 17.32, and 10.91 mg kg^-1, respectively, which were at medium or at slightly above medium level. The topsoil content of the soil available microelements was more than that of subsoil. The result of semivariance analysis showed that the topsoil available Fe and Mn were spatially correlated at a larger distance of 21.6 and 45.3 km, and the available Cu and Zn were at a shorter distance of 3.1 and 2.9 km, respectively. The subsoil spatial correlation distances were obviously different from the topsoil, which were in the order of available Mn 〉 Cu 〉 Zn = Fe. The Kriging method was applied to calculate the unobserved points and was used to generate the contour map. The results showed that the structural factors, such as topology, soil types, and soil properties, were the main factors influencing the spatial distribution of topsoil available Fe and Mn. Topsoil available Cu and Zn contents were mainly affected by land use, and their contents in orchard and in vegetable land were greatly higher than in field. The spatial distribution of subsoil microelements was similar to that of the topsoil, which exhibited vertical distribution patterns. Fertilizer and pesticide application resulted in the higher contents of available Cu and Zn in Pinggu County. The higher content of available Zn is potentially harmful to soil environmental quality, which should be inspected.

Research on Dairy Consumption of Rural Residents in Yanqing District of Beijing

Taking the rural residents in Yanqing District of Beijing as the research object,through field investigations and interviews,it is found that the main characteristics,income and expenditure level,preference and cognitive level of rural residents are the factors that affect the dairy consumption behavior of rural residents.Using the bivariate regression model for empirical analysis,it is concluded that rural residents'occupation,monthly average income,purchase expenditure and attitude towards dairy safety have a significant impact on rural residents'dairy consumption behavior,and then relevant constructive suggestions are put forward to guide rural residents'balanced consumption.

Leisure Agriculture Based on Cultural Resources of Sani People in Yunnan

Through exploring the material and nonmaterial cultural resources in leisure agriculture of Sani People in Shilin of Yunnan Province,this paper introduced festivals,marriage,traditional clothing,and food culture of Sani People,and present the long history and brilliant culture of Sani People. These culture resources could be used to expand the cultural aspects of leisure agriculture,to solve the problems of low participation and less distinct characteristics. This study can provide a reference for building the high-end leisure agriculture with distinct characteristics of Yunnan Province,to form a new growth point for regional growth.

Vacuolar Phosphate Transporter1 (VPT1) may transport sugar in response to soluble sugar status of grape fruits

Vacuolar Phosphate Transporter1(VPT1)-mediated phosphate uptake in the vacuoles is essential to plant development and fruit ripening.Interestingly,here we find that the VPT1 may transport sugar in response to soluble sugar status of fruits.The VvVPT1 protein isolated from grape(Vitis vinifera)berrieswas tonoplast-localized and contains SPX(Syg1/Pho81/XPR1)and MFS(major facilitator superfamily)domains.Its mRNA expression was significantly increased during fruit ripening and induced by sucrose.Functional analyses based on transient transgenic systems in grape berry showed that VvVPT1 positively regulated berry ripening and significantly affected hexose contents,fruit firmness,and ripening-related gene expression.The VPT1 proteins(Grape VvVPT1,strawberry FaVPT1,and Arabidopsis AtVPT1)all showed low affinity for phosphate verified in yeast system,while they appear different in sugar transport capacity,consistent with fruit sugar status.Thus,our findings reveal a role for VPT1 in fruit ripening,associated to its SPX and MFS domains in direct transport of soluble sugar available into the vacuole,and open potential avenues for genetic improvement in fleshy fruit.

Advances in photothermal conversion of carbon dioxide to solar fuels

Converting carbon dioxide(CO_(2)) into useful fuels or chemical feedstocks is important for achieving peak carbon emission and carbon neutrality.Recently,photothermal catalysis has been extensively studied and applied due to its advantages over traditional heat-driven catalysis.In this review,we focus on photothermal catalysis of thermodynamically uphill reactions that convert CO_(2)into value-added products.We first introduce the fundamentals of photothermal catalysis for CO_(2)reduction,including the definition and classification of photothermal catalysis,followed by their photothermal conversion processes.The structure design of different types of photothermal catalysts is summarized.The superior performance of photothermal catalytic conversion of CO_(2)is illustrated and discussed,including improved CO_(2)activation,tunable selectivity towards different solar fuel products,and resistance to sintering and coking.Finally,the perspectives and challenges in this cutting-edge field are presented with the aim of advancing understanding of the underlying mechanisms and inspiring rational design of photothermal catalysts for highly efficient solar-to-fuel conversion.

Analysis on Structure of Flower Market in Beijing

with the socio-economic development and people's living condition improvement,the requirement for environment is higher and higher and the mental demand is also more and more.For this,Beijing Municipal Bureau of Landscape and Forestry listed survey programs of consumption demands of flower market in Beijing in 2014,and provided several recommendations in line with current situations,problems and environment of the flower industry,for future reference of flower decision making of Beijing.In March 2014,the authors carried out survey in flower market of Beijing and participated in survey of management of flower industry.In May of the same year,combining this study,they visited ten districts(counties),including Dongcheng,Xicheng,Chaoyang,Fengtai,Shijingshan,and Daxing,together with relevant flower researchers,and carried out in-depth survey in several districts(counties)with better foundation of flower industry.Besides,with reference to China Flower&Gardening News and China Flowers&Horticulture,and relevant literature,it summarized and sorted out many years of various materials and statistical data of flower industry in Beijing.On the basis of surveying different flower markets and production areas and analyzing relevant data,the authors visited famous flower enterprises and large flower production and sales households in Beijing,elaborated current situations of Beijing flower industry in industrial foundation,development environment,industrial distribution,product type,and circulation field,and pointed out major problems in product type,market structure,production cost,service system,and logistics channels.Finally,it came up with practical and feasible solutions,hoping to provide certain reference for excellent development of flower industry in Beijing.

GA signaling protein LsRGL1 interacts with the abscisic acid signaling-related gene LsWRKY70 to affect the bolting of leaf lettuce

A variety of endogenous hormone signals,developmental cues,and environmental stressors can trigger and promote leaf lettuce bolting.One such factor is gibberellin(GA),which has been linked to bolting.However,the signaling pathways and the mechanisms that regulate the process have not been discussed in full detail.To clarify the potential role of GAs in leaf lettuce,significant enrichment of GA pathway genes was found by RNA-seq,among which the LsRGL1 gene was considered significant.Upon overexpression of LsRGL1,a noticeable inhibition of leaf lettuce bolting was observed,whereas its knockdown by RNA interference led to an increase in bolting.In situ hybridization analysis indicated a significant accumulation of LsRGL1 in the stem tip cells of overexpressing plants.Leaf lettuce plants stably expressing LsRGL1 were examined concerning differentially expressed genes through RNA-seq analysis,and the data indicated enhanced enrichment of these genes in the‘plant hormone signal transduction’and‘phenylpropanoid biosynthesis’pathways.Additionally,significant changes in LsWRKY70 gene expression were identified in COG(Clusters of Orthologous Groups)functional classification.The results of yeast one-hybrid,β-glucuronidase(GUS),and biolayer interferometry(BLI)experiments showed that LsRGL1 proteins directly bind to the LsWRKY70 promoter.Silencing LsWRKY70 by virus-induced gene silencing(VIGS)can delay bolting,regulate the expression of endogenous hormones,abscisic acid(ABA)-linked genes,and flowering genes,and improve the nutritional quality of leaf lettuce.These results strongly associate the positive regulation of bolting with LsWRKY70 by identifying its vital functions in the GA-mediated signaling pathway.The data obtained in this research are invaluable for further experiments concerning the development and growth of leaf lettuce.

Construction of Smart Library Based on the Agricultural Information from Metaverse Horizon

Metaverse is a virtual world,but it is possible and even becomes a trend that metaverse interacts with the real world along with the sci-tech and social development.Smart library is a main direction of modern library development,from informatization to digitization and then intelligent-based,modernization of library has been improved qualitatively.Emergence of metaverse brings a brand-new horizon to the generation and application of agricultural information,this paper made primary explorations the requirements and action mechanism of agricultural information on the construction of smart library within the external constraint of metaverse.

Targeting cancer cytoskeleton: the mechanical properties of natural anticancerdrugs

Anticancer drugs are one of the most direct means of cancer therapy.However,the various cancer progressions hamper the development and discovery of anticancer drugs.In fact,the mechanical properties of the tumor cytoskeleton are extremely vital for any phase of cancer,especially in tumor invasion and metastasis.However,in the current category of anticancer drugs,the cytoskeleton-targeting drugs are limited and their role in tumor progression is unclear.Here,we present the mechanical characteristics of tumor stiffness that are tightly regulated by the cancer cytoskeleton,including actin filaments and microtubules during tumor initiation,growth and metastasis,and review the natural drugs that target the cancer cytoskeleton.We define cytoskeleton dynamics as target mechanisms for anticancer drugs and summarize the plant,microbial and marine sources of natural products.Furthermore,this paper also provides a material pathway to study active tumor mechanics,and introduces the unique advantages and future application potential of tumor cytoskeleton-targeting drugs in clinical use.The material approaches to active cancer mechanics are supplied in this review.We aim to promote the development of anticancer drugs that target tumor mechanics by using those material approaches and finding their pharmacological application.

Could natural phytochemicals be used to reduce nitrogen excretion and excreta‑derived N_(2)O emissions from ruminants?

Ruminants play a critical role in our food system by converting plant biomass that humans cannot or choose not to consume into edible high-quality food.However,ruminant excreta is a significant source of nitrous oxide(N_(2)O),a potent greenhouse gas with a long-term global warming potential 298 times that of carbon dioxide.Natural phytochemicals or forages containing phytochemicals have shown the potential to improve the efficiency of nitrogen(N)utilization and decrease N_(2)O emissions from the excreta of ruminants.Dietary inclusion of tannins can shift more of the excreted N to the feces,alter the urinary N composition and consequently reduce N_(2)O emissions from excreta.Essential oils or saponins could inhibit rumen ammonia production and decrease urinary N excretion.In grazed pastures,large amounts of glucosinolates or aucubin can be introduced into pasture soils when animals consume plants rich in these compounds and then excrete them or their metabolites in the urine or feces.If inhibitory compounds are excreted in the urine,they would be directly applied to the urine patch to reduce nitrification and subsequent N_(2)O emissions.The phytochemicals’role in sustainable ruminant production is undeniable,but much uncertainty remains.Inconsistency,transient effects,and adverse effects limit the effectiveness of these phytochemicals for reducing N losses.In this review,we will identify some current phytochemicals found in feed that have the potential to manipulate ruminant N excretion or mitigate N_(2)O production and deliberate the challenges and opportunities associated with using phytochemicals or forages rich in phytochemicals as dietary strategies for reducing N excretion and excreta-derived N_(2)O emissions.

Strategies and prospects for melatonin to alleviate abiotic stress in horticultural plants

Melatonin is a conserved pleiotropic molecule in animals and plants.Melatonin is involved in many development processes and stress responses;thus,exploring its function in plants,particularly in horticultural plants,has become a rapidly developing field.Many studies have revealed that phytomelatonin acts as a plant biostimulant and increase its tolerance to various abiotic stressors,including extreme temperature,drought,osmotic disturbance,heavy metals,and ultraviolet(UV).Melatonin appears to have roles in the scavenging of reactive oxygen species(ROS)and other free radicals,affecting the primary and secondary metabolism of plants,regulating the transcripts of stress-related enzymes and transcription factors,and crosstalk with other hormones under different environmental conditions.This pleiotropy makes phytomelatonin an attractive regulator to improve resistance to abiotic stress in plants.The recent discovery of the potential phytomelatonin receptor CAND2/PMTR1 and the proposition of putative models related to the phytomelatonin signaling pathways makes phytomelatonin a new plant hormone.Based on relevant studies from our laboratory,this review summarizes the phytomelatonin biosynthetic and metabolic pathways in plants and the latest research progress on phytomelatonin in abiotic stress of horticultural plants.This study will provide a reference for elucidating the regulatory mechanism of phytomelatonin affecting the resistance to abiotic stress in plants.

Comment on “A novel antibiotic class targeting the lipopolysaccharide transporter”

Crisis of antibiotic resistant has become a global threat to public health in recent decades[1–4].Carbapenem antibiotics are a class of atypicalβ-lactam antibiotics with the broadest antibacterial spectrum and the strongest antibacterial activity.However,carbapenem-resistant Acinetobacter baumannii(CRAB)is stilly emerging,which is a gram-negative bacterium with lipopolysaccharide(LPS),which makes it resistant to several antibiotics and thus difficult to eliminate[5,6].As the number one pathogen of nosocomial infection,CRAB can cause severe pneumonia and bloodstream infection,etc.The mortality rate of patients infected with invasive CRAB can be as high as 40%to 60%,and it has been listed as the key pathogen of Class 1 by the World Health Organization.Due to the lack of feasible antibiotic strategies,phage combination therapy has been used in some patients,while the efficacy is limited[7].Therefore,new discovery and development of antibiotic that targeting CRAB is urgently demand.Fortunately,Kenneth A.