Subjects: Digital Publishing >> New Media submitted time 2023-10-08 Cooperative journals: 《中国传媒科技》
Abstract：互联网的发展改变了各行各业的运作模式。在广播电视领域不断进步的过程中,也广泛依赖于信息技术,当前,广播电视领域信息系统建设已经较为成熟,但信息系统安全问题却层出不穷。信息安全在保障国家安全、社会和谐发展等方面发挥重要作用,因此,为了能够充分发挥信息系统作用,推动广播电视行业高效发展,必须针对当前存在的系统安全问题进行分析,予以优化。本文就对广播电视信息系统安全建设展开分析,供参考。
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Basic Disciplines of Agriculture submitted time 2017-11-09 Cooperative journals: 《中国生态农业学报》
Abstract：为了解不同耕作管理措施对我国北方旱作农田作物生产生命周期内生产资料及生产过程碳排放足迹的影响, 在山西省临汾市尧都区连续15 年保护性耕作长期定位试验基地, 利用静态箱-气相色谱法连续两年测定了不同秸秆管理和耕作措施(秸秆不还田旋耕、秸秆还田旋耕、秸秆覆盖免耕)下, 旱作冬小麦田N2O 周年排放通量, 并对不同耕作管理措施的生产资料和生产过程中的碳排放进行全面分析与计算, 以估算不同耕作措施的碳足迹。结果表明: 1)秸秆覆盖免耕和秸秆不还田旋耕条件下旱作冬小麦田N2O 年度累积排放量较秸秆还田旋耕分别平均减少19.2%和18.9%; 2)旱作冬小麦在秸秆覆盖免耕条件下产量最高; 3)旱作农田碳足迹中氮肥生产、农田N2O 直接排放和柴油消耗排放占到总排放足迹的90%以上; 4)秸秆覆盖免耕较其他耕作方式的碳足迹低, 两年试验期间, 较秸秆还田旋耕处理碳足迹分别低11.0%和6.9%, 较秸秆不还田旋耕处理碳足迹分别低7.9%和8.3%。5)在半干旱地区, 秸秆覆盖免耕处理单位产量碳足迹最低, 是本研究中低碳低排的推荐措施。本研究结果可为旱作农田以低碳减排为目标的可持续发展提供科学依据。
Subjects: Biology >> Botany submitted time 2018-06-19 Cooperative journals: 《广西植物》
Abstract： 芦苇和虉草均具有较强的去污能力，常作为湿地植物配置于同一人工湿地进行污水处理。芦苇作为一种强化感植物对虉草具有较强的化感作用，在自然湿地和人工湿地中均会出现芦苇代替虉草的现象，且这一现象的发生与土壤含水量存在一定联系，此外，有研究表明芦苇腐解土对虉草的化感抑制效应与腐解土中总酚酸的量密切相关。因此，该文采用高效液相色谱法对不同水分环境下芦苇腐解土中酚酸类物质进行分离和鉴定，研究芦苇腐解土中主要酚酸类物质的水分响应特性，筛选出其中对水分响应较为明显的酚酸物质种类，通过湿地土壤水分调控，以达成虉草芦苇间的竞争平衡，从而维持人工湿地中两物种的长期稳定共存。结果显示:芦苇腐解土中可分离出没食子酸、香豆酸、香草酸、丁香酸、对香豆酸、阿魏酸、水杨酸和苯甲酸等8 种酚酸类物质，其中，香豆酸、苯甲酸和阿魏酸等3种酚酸类物质含量较高。分离出的8种酚酸类物质的含量与腐解土的相对含水量均呈显著线性负相关关系，即随着腐解土相对含水量的上升，酚酸类物质的含量均呈现下降趋势，且各种酚酸类物质对水分的响应趋势均可用线性方程较好地拟合。其中,香豆酸、没食子酸和阿魏酸对芦苇腐解土的水分响应最为明显。因此，可将香豆酸、没食子酸和阿魏酸作为主要调控目标，通过调控湿地土壤中水分含量，削弱芦苇对虉草的化感抑制效应，从而维持虉草芦苇群落的稳定。
Subjects: Biology >> Botany >> Applied botany submitted time 2021-11-04 Cooperative journals: 《广西植物》
Abstract： WD40, as a transcription factor family, is widely involved in regulating plant growth, development, secondary metabolite accumulation and environmental adaptation. In order to explore the role of the WD40 family in the growth, development, secondary metabolite accumulation and tolerance, all the WD40 genes of Meconopsis horridula were identified in this study based on the full-length transcriptome sequencing data and conducted bioinformatics analysis of these genes and their encoded proteins. The results were as follows: A total of 19 WD40 genes were identified, and all the proteins included typical WD40 domain, the amino acid numbers and molecular weight of the protein encoded by WD40 genes were 109-758 and 11 830-84 130 kDa, respectively, and most of the proteins localized in the nucleus, and all proteins belonged to hydrophilic protein; Phylogenetic tree analysis showed that WD40 proteins of M. horridula were closely to Papaver somniferum and Macleaya cordata; The promoter region of WD40 gene contained different amounts of hormones or stress-response elements, suggesting that this family genes may be involved in the regulation of various biological processes, such as growth, development and secondary metabolite accumulation; The tertiary structure of WD40 proteins showed that these proteins evolved in different degrees during the evolutionary process. These results can provide a preliminary basis for further research on the specific mechanism of WD40 gene family in response to stress and secondary metabolite accumulation.
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Basic Disciplines of Agriculture submitted time 2017-11-07 Cooperative journals: 《中国生态农业学报》
Abstract：人类活动导致全球大气CO2 浓度持续升高, 研究大气CO2 浓度升高对C4 作物谷子(Setaria italica)生长发育及虫害发生的影响, 可以为谷子等C4 作物制订应对气候变化栽培措施提供理论依据。本研究利用OTC (Open Top Chamber)系统, 设两个CO2 浓度梯度(正常大气CO2 浓度、正常CO2 浓度+200 μmol·mol1)模拟CO2浓度升高对谷子生长发育的影响。结果表明: 大气CO2 浓度升高后, 谷子净光合速率(Pn)、气孔导度(gs)、叶片蒸腾速率(Tr)和水分利用率(WUE)分别增加38.73%、27.53%、6.93%和40.56%; 谷子叶片光系统Ⅱ最大光化学量子产量(Fv/Fm)和非光化学淬灭系数(NPQ)显著下降, 光系统Ⅱ实际光化学量子产量(ΦPSII)和表观电子传递效率(ETR)显著增加, 而对光化学淬灭系数(qP)无显著影响; 此外, 谷子株高、茎粗和小穗数分别增加3.41%、13.28%和13.11%; 而叶重、茎重、千粒重、单株粒数和产量无显著变化, 穗重和地上部分生物量分别显著下降12.8%和7.44%; 大气CO2 浓度升高后, 谷子灌浆期和收获期玉米螟(Ostrinia furnacalis)发生数量显著增加。大气CO2 浓度升高将有利于谷子的生长发育, 但会增加玉米螟危害。
Subjects: Materials Science >> Materials Science (General) submitted time 2017-03-31 Cooperative journals: 《腐蚀科学与防护技术》
Abstract：模拟含硫原油加工过程中生成的具有高自然性的腐蚀产物，利用三氧化二铁与硫化氢反应制备硫铁化合物，将硫化反应产物分为两部分，一部分保存在乙醇中，一部分暴露于空气中。用XPS研究硫化产物及其氧化产物中硫、铁的存在形态。结果表明，硫化产物中硫元素主要存在形式是二硫化亚铁；氧化产物中主要存在形式是硫酸盐，少部分硫化亚铁、单质硫及FeSx。硫化产物和氧化产物中铁元素的主要存在形式都是三氧化二铁和二硫化亚铁。
Subjects: Psychology >> Developmental Psychology submitted time 2023-03-28 Cooperative journals: 《心理科学进展》
Abstract： The integration of various emotional information from different modalities (e.g., face and voice) plays an important role in our interpersonal communication. In order to understand its brain mechanism, more and more researchers found that the interaction between facial expression and vocal emotional information begins in the early stage of perception, and the integration of emotional information content occurs in the late decision-making stage. In the early stage, the primary sensory cortex is responsible for encoding information; while in the late stage, the amygdala, temporal lobe and other advanced brain regions are responsible for cognitive evaluation. In addition, the functional coupling of oscillation activities on multiple frequency bands facilitates the integration of emotional information cross channels. Future research needs to explore whether facial expression and vocal emotional information integration is associated with emotional conflict, and whether inconsistent emotional information has advantages. Lastly, we should find out how the neural oscillations of different frequency bands promotes the integration of facial expression and vocal emotional information, so as to further understand its dynamic basis.
Subjects: Biology >> Botany submitted time 2018-06-12 Cooperative journals: 《广西植物》
Abstract： 目前对于小花清风藤的化学成分和药理作用的研究较少，为了阐明小花清风藤的物质基础，本研究对小花清风藤Sabia parviflora的干燥叶，采用反复硅胶柱色谱、Sephadex LH-20柱色谱、制备薄层色谱及重结晶等手段进行分离纯化，运用化学分析和波谱学方法鉴定化合物的结构。结果标明：从小花清风藤干燥叶的甲醇超声提取物中分离得到12个化合物，分别为N-反式阿魏酰酪胺（1）、N-顺式阿魏酰酪胺（2）、N-反式-对-香豆酰酪胺（3）、N-顺式-对-香豆酰酪胺（4）、N-反式-对-香豆酰章鱼胺（5）、N-顺式-对-香豆酰章鱼胺（6）、阿魏酸（7）、芹菜素（8）、木犀草素（9）、咖啡酸（10）、5-氧阿朴菲碱（11）、齐墩果酸（12）。其中，化合物2，4～9为首次从清风藤属植物中分离得到，1，3，10为首次从该植物分离得到。
Subjects: Medicine, Pharmacy >> Preventive Medicine and Hygienics submitted time 2023-12-11 Cooperative journals: 《中国全科医学》
Abstract： Background Venous thromboembolism（VTE）has become the third most common cardiovascular disease after ischemic heart disease and stroke. Since the official launch of the National Programme for Prevention and Management of Pulmonary Embolism and Deep Vein Thrombosis in 2018，medical personnel have paid more attention to VTE，and the screening rate of VTE has also increased significantly. However，epidemiological investigations related to VTE are mostly limited to single center studies. There is still a lack of large-scale survey data on the prevalence of VTE involving different levels and properties of medical institutions. Objective To understand the prevalence and epidemiological characteristics of VTE in Jiaxing，and provide a basis for further prevention and treatment of VTE in this region. Methods A total of 731 755 discharged patients diagnosed with VTE from all secondary and above medical institutions in Jiaxing City in 2021 were included as the study subjects. General patient data and disease diagnosis-related grouping indicators reflecting the number of patients admitted to the hospital and the difficulty of diagnosis and treatment techniques were collected. Multiple linear regression analysis was used to explore influencing factors of the number of VTE patients in hospitals. Results According to inclusion and exclusion criteria，a total of 10 758 VTE patients were diagnosed，including 10429 patients with deep vein thrombosis（DVT）and 614 patients with pulmonary thromboembolism（PTE）. The median age of patients was 71（62，79）years. The number of VTE patients in general hospital was the highest， which amounting to 9 732 cases （90.46%）， while the number of VTE patients in psychiatric hospital was the lowest at 53 cases（0.49%）.The number of VTE patients in tertiary hospitals was higher than that in secondary hospitals ［7 929（73.70%）vs. 2 829（26.30%）］. The proportion of VTE patients in general hospital was the highest at 1.85%，and the lowest in maternal and child health hospital at 0.10%. The proportion of VTE patients in tertiary hospitals was higher than that in secondary hospitals，at 1.80% and 0.97%，respectively. The prevalence of VTE in different age groups was statistically significant（χ2 =32 383.098，P<0.001）. The prevalence of VTE in the high age group was higher than that in the low age group（P<0.05） when comparing the prevalence of VTE between different age groups（P<0.05）. The prevalence of VTE in males aged 15-44 years was significantly higher than that in females，with statistical significant difference（P<0.001）. Surgical treatment is a risk factor for VTE patients. The results of linear regression analysis showed that weight（RW）≥ 2 cases was the factor influencing the number of VTE patients（P<0.001），and the number of VTE cases increased by 0.363 for each increase in the number of cases with RW ≥ 2 cases. Conclusion The prevalence rate of VTE in Jiaxing is 199.2 per 100 000 population， and the disease burden of VTE in Jiaxing has reached or even exceeded western countries. The main risk populations of VTE were elderly patients who have received surgical treatment，with malignant neoplasm，fracture in hip，pelvis or lower limb，heart failure，respiratory failure，etc. The level of prevention and treatment of VTE in general hospitals in this region should be further improved. In addition，the participation and attention to the standardized prevention and treatment of VTE in traditional Chinese medicine hospitals，maternity and child health care hospitals and psychiatric hospitals should be enhanced.
Subjects: Biology >> Zoology submitted time 2017-10-11 Cooperative journals: 《动物营养学报》
Abstract：本试验旨在研究饲粮精粗比对泌乳水牛瘤胃细菌和甲烷菌区系的影响。选取15头健康杂交后备泌乳水牛，按体重、采食量等相近原则随机分为3组，每组5头，分别饲喂精粗比为0:100（全粗料组）、35:65（低精料组）、50:50（中等精料组）的混合饲粮。试验为期40 d，其中前10 d为预试期。在试验结束后第1天，经口腔抽取瘤胃液抽提微生物DNA，采用Illumina Miseq PE250平台研究瘤胃细菌和甲烷菌区系组成。结果表明：1）在门水平上，水牛瘤胃内拟杆菌门（45%~60%）、厚壁菌门（13%~27%）和变形菌门（13%~18%）为主要细菌类别，与低精料组和中等精料组相比，全粗料组提高了拟杆菌门、黄杆菌门和SR1细菌的比例，降低了厚壁菌门、疣微菌门、放线菌门和绿弯菌门细菌的比例；在科水平上，普雷沃氏科（15%~32%）和黄杆菌科（8%~21%）为主要细菌类别，与中等精料组相比，全粗料组、低精料组提高了普雷沃氏科细菌的比例，降低了黄杆菌科、毛螺菌科、瘤胃球菌科、红蝽杆菌科和双歧杆菌科细菌的比例；中等精料组瘤胃细菌相比全粗料组有更高的多样性。2）水牛瘤胃内，90%以上的甲烷菌为甲烷短杆菌属，其次为热原体属，饲粮精粗比的改变并未影响甲烷短杆菌属在瘤胃内的优势地位。综合得出，全粗料饲粮有提高水牛瘤胃内纤维降解相关细菌比例的趋势，却降低了瘤胃细菌的多样性；饲粮精粗比的差异对水牛瘤胃甲烷菌在属水平上的组成并无显著影响。
Subjects: Medicine, Pharmacy >> Preclinical Medicine submitted time 2017-12-07 Cooperative journals: 《南方医科大学学报》
Abstract： Objective To investigate the effects of ursolic acid on corneal graft rejection in a rat model of othotopic corneal allograft transplantation. Methods Forty-eight recipient Wistar rats were divided into normal control group with saline treatment (group A), autograft group with saline treatment (group B), SD rat allograft group with saline treatment (group C), and SD rat allograft group with intraperitoneal ursolic acid (UA) treatment group (group D). The rats received saline or UC(20 mg·kg-1·d-1) treatment for 12 days following othotopic graft transplantation. The grafts were evaluated using the Larkin corneal rejection rating system, and the graft survival was assessed with Kaplan-Meier analysis. On day 14, the grafts were harvested for histological examination, Western blotting, and assessment of expressions of interlukin-2 (IL-2), interferon-γ (IFN-γ), nuclear transcription factor-κB (NF-κB) p65, vascular endothelial growth factor (VEGF) and intercellular adhesion molecule-1 (ICAM-1). Results The allograft survival was significantly longer in group D than in group C (29.12±9.58 vs 9.67±2.16 days, P<0.05). UC treatment obviously reduced the expression levels of IL-2, IFN-γ, NF-κBp65, ICAM-1 and VEGF and increased inhibitory kappa B alpha (IκB-α) expression in the grafts, where no obvious inflammatory cell infiltration or corneal neovascularization was found. Conclusion As a NF-κB inhibitor, ursolic acid can prevent corneal neovascularization and corneal allograft rejection to promote graft survival in rats following orthotopic corneal allograft transplantation.
Subjects: Biology >> Botany >> Applied botany submitted time 2022-06-07 Cooperative journals: 《广西植物》
Abstract： The naturalization and invasion of alien species have caused a serious impact on the global environment and social development, and have become a global problem faced by countries in biodiversity management and ecological conservation. China is one of the countries most seriously affected by alien invasion, and the situation is serious in the early warning ， management and governance of alien invasion. Based on field surveys and literature research, Chenopodiastrum murale (L.) S. Fuentes, Uotila & Borsch, an alien invasive plant of Amaranthaceae sensu lato, is first reported for flora of China. C. murale is native to the Mediterranean region and has spread to more than 40 countries in Europe, America, Africa and Oceania. It is an invasive alien plant with great harm, and it is also clearly prohibited by customs and quarantine departments. This exotic invasive plant is now found in Chenggong District, Kunming City, Yunnan Province. This paper describes the morphological characteristics of the species in detail, as well as brief introduction of its taxonomical history, and provides field ecological photos for identification and comparison. In addition, the possible introduction route of C. murale was analyzed, and its potential harm and invasive risks are briefly assessed. This new record clearly demonstrate that the background survey of Chinese alien invasive plants is still insufficient.
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Basic Disciplines of Agriculture submitted time 2017-11-09 Cooperative journals: 《中国生态农业学报》
Abstract：甲烷(CH4)是主要温室气体之一, 对全球增温的作用仅次于二氧化碳(CO2)。稻田是CH4 的重要排放源, 减少稻田CH4 排放对减缓气候变暖具有直接效应。为此, 掌握稻田CH4 排放的规律和特征对控制和减少稻田CH4 排放尤为重要。为了解稻田温室气体排放的主要影响因子及影响程度, 估算稻田温室气体全球增温潜势,寻求农田减排措施, 我们通过收集已发表的文献建立了稻田CH4 排放的数据库, 采用析因分析与回归分析方法对稻田CH4 日排放量和全球增温潜势特征和可能的影响因子进行了分析。结果表明, 稻田CH4 日排放量和增温潜势均随土壤有机质背景含量的升高而增加, 不同类型稻田CH4 日排放量大小依次为: 双季稻晚稻>双季稻早稻>单季稻>稻麦轮作晚稻; 晚稻田CH4 的增温潜势大于早稻田。不同肥料处理条件下, 稻田CH4 日排放量表现为: 秸秆还田>配施有机肥>化学氮肥≈生物炭。控制灌溉水量可降低稻田CH4 的综合增温潜势, 表现为:持续淹水>晒田>干湿交替>控制灌溉。研究结果说明, 稻田CH4 的产生与排放过程受土壤有机质含量、肥料管理和水分管理以及轮作制度等多种因素的共同影响, 应依据不同土壤条件和种植制度, 适当调整肥水管理,以减少稻田温室气体排放, 降低其增温潜势。
Subjects: Agriculture, Forestry,Livestock & Aquatic Products Science >> Basic Disciplines of Agriculture submitted time 2017-11-09 Cooperative journals: 《中国生态农业学报》
Abstract：甲烷(CH4)是主要温室气体之一, 对全球增温的作用仅次于二氧化碳(CO2)。稻田是CH4 的重要排放源, 减少稻田CH4 排放对减缓气候变暖具有直接效应。为此, 掌握稻田CH4 排放的规律和特征对控制和减少稻田CH4 排放尤为重要。为了解稻田温室气体排放的主要影响因子及影响程度, 估算稻田温室气体全球增温潜势,寻求农田减排措施, 我们通过收集已发表的文献建立了稻田CH4 排放的数据库, 采用析因分析与回归分析方法对稻田CH4 日排放量和全球增温潜势特征和可能的影响因子进行了分析。结果表明, 稻田CH4 日排放量和增温潜势均随土壤有机质背景含量的升高而增加, 不同类型稻田CH4 日排放量大小依次为: 双季稻晚稻>双季稻早稻>单季稻>稻麦轮作晚稻; 晚稻田CH4 的增温潜势大于早稻田。不同肥料处理条件下, 稻田CH4 日排放量表现为: 秸秆还田>配施有机肥>化学氮肥≈生物炭。控制灌溉水量可降低稻田CH4 的综合增温潜势, 表现为:持续淹水>晒田>干湿交替>控制灌溉。研究结果说明, 稻田CH4 的产生与排放过程受土壤有机质含量、肥料管理和水分管理以及轮作制度等多种因素的共同影响, 应依据不同土壤条件和种植制度, 适当调整肥水管理,以减少稻田温室气体排放, 降低其增温潜势。
Subjects: Biology >> Botany submitted time 2023-08-25 Cooperative journals: 《干旱区研究》
Abstract： The effects of different salt types and concentrations on the germination characteristics of Poa annuaseeds were studied using the Petri dish method in this study. The relative germination rate, potential, index, vigor,bud length, radicle length, and salt damage rate were measured, analyzing the responses of P. annua seedgermination and seedling growth to different salt types. The results indicated that: (1) P. annua from Yongchanghad superior germination and seedling growth characteristics compared with the other provenances. (2) varioussalt types and concentrations significantly inhibited seed germination and seedling growth, with alkaline saltsexhibiting stronger toxicity compared with neutral salts, and radicles being more sensitive than buds duringgermination; and (3) the salt toxicity of different salt types during P. annua seed germination ranked as follows:Na2CO3>NaHCO3>Na2SO4>NaCl. Therefore, this study provides a scientific basis for planting P. annua forecological restoration of different types of saline lands.
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