Combined Promoting Effects of Specific Organic Functional Groups and Alumina Surface Characteristics for the Design of a Highly Efficient NiMo/Al_(2)O_(3) Hydrodesulfurization Catalyst

To prepare a highly efficient NiMo/Al_(2)O_(3) hydrodesulfurization catalyst,the combined effects of specific organic functional groups and alumina surface characteristics were investigated.First,the correlation between the surface characteristics of four different alumina and the existing Mo species states was established.It was found that the Mo equilibrium adsorption capacity can be used as a specific descriptor to quantitatively evaluate the changes in surface characteristics of different alumina.A lower Mo equilibrium adsorption capacity for alumina means weaker metal-support interaction and the loaded Mo species are easier to transform into MoS2.However,the Mo-O-Al bonds still exist at the metal-support interface.The introduction of cationic surfactant hecadecyl trimethyl ammonium bromide(CTAB)can further improve Mo species dispersion through electrostatic attraction with Mo anions and interaction of its alkyl chain with the alumina surface;meanwhile,the introduction of ethylenediamine tetraacetic acid(EDTA)can complex with Ni ions to enhance the Ni-promoting effect on Mo.Therefore,the NiMo catalyst designed using alumina with lower Mo equilibrium adsorption capacity and the simultaneous addition of EDTA and CTAB exhibits the highest hydrodesulfurization activity for 4,6-dimethyl dibenzothiophene because of its proper metal-support interaction and more well-dispersed Ni-Mo-S active phases.

Impacts of exercise interventions on different diseases and organ functions in mice

Background'. In recent years, much evidence has emerged to indicate that exercise can benefit people when performed properly. This reviewsummarizes the exercise interventions used in studies involving mice as they are related to special diseases or physiological status. To furtherunderstand the effects of exercise interventions in treating or preventing diseases, it is important to establish a template for exercise interventionsthat can be used in future exercise-related studies.Methods'. PubMed was used as the data resource for articles. To identify studies related to the effectiveness of exercise interventions for treatingvarious diseases and organ functions in mice, we used the following search language: (exercise [Title] OR training [Title] OR physical activity[Title]) AND (mice [title/abstract] OR mouse [title/abstract] OR mus [title/abstract]). To limit the range of search results, we included 2 filters:one that limited publication dates to "in 10 years,^ and one that sorted the results as "best match^^. Then we grouped the commonly used exercisemethods according to their similarities and differences. We then evaluated the effectiveness of the exercise interventions for their impact on diseasesand organ functions in 8 different systems.Results'. A total of 331 articles were included in the analysis procedure. The articles were then segmented into 8 systems for which the exerciseinterventions were used in targeting and treating disorders: motor system (60 studies), metabolic system (45 studies), cardio-cerebral vascularsystem (58 studies), nervous system (74 studies), immune system (32 studies), respiratory system (7 studies), digestive system (1 study), and thesystem related to the development of cancer (54 studies). The methods of exercise interventions mainly involved the use of treadmills, voluntarywheel-running, forced wheel-running, swimming, and resistance training. It was found that regardless of the specific exercise method used, mostof them demonstrated positive effects on various systemic diseases and organ functions. Most diseases were remitted with exercise regardless ofthe exercise method used, although some diseases showed the best remission effects when a specific method was used.Conclusion-. Our review strongly suggests that exercise intervention is a cornerstone in disease prevention and treatment in mice. Because exerciseinterventions in humans typically focus on chronic diseases, national fitness, and body weight loss, and typically have low intervention com・pliance rates, it is important to use mice models to investigate the molecular mechanisms underlying the health benefits from exerciseinterventions in humans.

Preparation of organically functionalized silica gel as adsorbent for copper ion adsorption

A novel adsorbent （AMPS-silica） was synthesized by bounding AMPS （2-acrylamido-2-methylpropanesulfonic acid） onto silica surface, which functioned with γ-methacryloxypropyltrimethoxysilane reagent. The adsorbent was characterized by nitrogen adsorption/desorption measurement, thermogravimetric analysis （TGA） and potentiometric titration analysis. The TGA result indicated that the surface modification reactions introduced some organic functional groups onto the surface of silica. The surface area of AMPSsilica was 389.7 m2/g. The adsorbent was examined for copper ion removal in series of batch adsorption experiments. Results showed that the adsorption of Cu2＋ onto AMPS-silica was pH dependent, and the adsorption capacity increased with increasing pH from 2 to 6. The adsorption kinetics showed that Cu^2＋ adsorption was fast and the data fitted well with a pseudo secondorder kinetic model. The adsorption of Cu^2＋ onto AMPS-silica obeyed both Freundlich and Langmuir isotherms, with r^2 = 0.993 and r^2 = 0.984, respectively. The maximum Cu^2＋ adsorption capacity was 19.9 mg/g. The involved mechanism might be the adsorption through metal binding with organic functional groups such as carboxyl, amino and sulfonic groups. Cu^2＋ loaded on AMPS-silica could be desorbed in HNO3 solution, and the adsorption properties remain stable after three adsorption-desorption cycles.

The Trace Elements are Bounded by Organic Functional Groups in Coal:A Studying Result Based on FTIR Analysis

The relationship between trace elements in coal and organic functional groups of coal, also some of aromatic structure, was investigated by using curve fitting of infrared spectra. Cluster analysis was also performed according to the degree of affinity of organic groups to the trace elements. The results show that there is a possibility that trace elements, especially LREE, were bound to peripheral organic functional groups of middle rank coal macromolecule. The most possible functional group that binds trace element is the hydroxyl, and to the less degree, the asymmetric -CH3 and 〉CH2 stretching, -CH3 stretching, etc. The degree of affinity of trace elements to different functional groups varies. The tendency obeys the natural structural changing law of trace elements-- the periodic law. The deviation of some trace elements from this regular trend is attributed to the deviation of intrinsic ＂confusion degree＂ （conventional molar entropy） of the matter system of coal basin, which is affected by the inner and outer factors during the evolution.

Changes in Transformation of Soil Organic C and Functional Diversity of Soil Microbial Community Under Different Land Uses

Changes in soil biological and biochemical properties under different land uses in the subtropical region of China were investigated in order to develop rational cultivation and fertilization management. A small watershed of subtropical region of China was selected for this study. Land uses covered paddy fields, vegetable farming, fruit trees, upland crops, bamboo stands, and forestry. Soil biological and biochemical properties included soil organic C and nutrient contents, mineralization of soil organic C, and soil microbial biomass and community functional diversity. Soil organic C and total N contents, microbial biomass C and N, and respiration intensity under different land uses were changed in the following order： paddy fields （and vegetable farming） 〉 bamboo stands 〉 fruit trccs （and upland）. The top surface （0-15 cm） paddy fields （and vegetable farming） were 76.4 and 80.8% higher in soil organic C and total N contents than fruit trees （and upland） soils, respectively. Subsurface paddy soils （15-30 cm） were 59.8 and 67.3% higher in organic C and total N than upland soils, respectively. Soil microbial C, N and respiration intensity in paddy soils （0-15 cm） were 6.36, 3.63 and 3.20 times those in fruit tree （and upland） soils respectively. Soil microbial metabolic quotient was in the order： fruit trees （and upland） 〉 forestry 〉 paddy fields. Metabolic quotient in paddy soils was only 47.7% of that in fruit tree （and upland） soils. Rates of soil organic C mineralization during incubation changed in the order： paddy fields 〉 bamboo stands 〉 fruit trees （and upland） and soil bacteria population： paddy fields 〉 fruit trees （and upland） 〉 forestry. No significant difference was found for fungi and actinomycetes populations. BIOLOG analysis indicated a changing order of paddy fields 〉 fruit trees （and upland） 〉 forestry in values of the average well cell development （AWCD） and functional diversity indexes of microbial community. Results also showed that the conversion from paddy fields to vegetable farming for 5 years resulted in a dramatic increase in soil available phosphorus content while insignificant changes in soil organic C and total N content due to a large inputs of phosphate fertilizers. This conversion caused 53, 41.5, and 41.3% decreases in soil microbial biomass C, N, and respiration intensity, respectively, while 23.6% increase in metabolic quotient and a decrease in soil organic C mineralization rate. Moreover, soil bacteria and actinomycetes populations were increased slightly, while fungi population increased dramatically. Functional diversity indexes of soil microbial community decreased significantly. It was concluded that land uses in the subtropical region of China strongly affected soil biological and biochemical properties. Soil organic C and nutrient contents, mineralization of organic C and functional diversity of microbial community in paddy fields were higher than those in upland and forestry. Overuse of chemical fertilizers in paddy fields with high fertility might degrade soil biological properties and biochemical function, resulting in deterioration of soil biological quality.

Microbial community structure and functional metabolic diversity are associated with organic carbon availability in an agricultural soil

Exploration of soil environmental characteristics governing soil microbial community structure and activity may improve our understanding of biogeochemical processes and soil quality. The impact of soil environmental characteristics especially organic carbon availability after 15-yr different organic and inorganic fertilizer inputs on soil bacterial community structure and functional metabolic diversity of soil microbial communities were evaluated in a 15-yr fertilizer experiment in Changping County, Beijing, China. The experiment was a wheat-maize rotation system which was established in 1991 including four different fertilizer treatments. These treatments included： a non-amended control（CK）, a commonly used application rate of inorganic fertilizer treatment（NPK）; a commonly used application rate of inorganic fertilizer with swine manure incorporated treatment（NPKM）, and a commonly used application rate of inorganic fertilizer with maize straw incorporated treatment（NPKS）. Denaturing gradient gel electrophoresis（DGGE） of the 16 S r RNA gene was used to determine the bacterial community structure and single carbon source utilization profiles were determined to characterize the microbial community functional metabolic diversity of different fertilizer treatments using Biolog Eco plates. The results indicated that long-term fertilized treatments significantly increased soil bacterial community structure compared to CK. The use of inorganic fertilizer with organic amendments incorporated for long term（NPKM, NPKS） significantly promoted soil bacterial structure than the application of inorganic fertilizer only（NPK）, and NPKM treatment was the most important driver for increases in the soil microbial community richness（S） and structural diversity（H）. Overall utilization of carbon sources by soil microbial communities（average well color development, AWCD） and microbial substrate utilization diversity and evenness indices（H＇ and E） indicated that long-term inorganic fertilizer with organic amendments incorporated（NPKM, NPKS） could significantly stimulate soil microbial metabolic activity and functional diversity relative to CK, while no differences of them were found between NPKS and NPK treatments. Principal component analysis（PCA） based on carbon source utilization profiles also showed significant separation of soil microbial community under long-term fertilization regimes and NPKM treatment was significantly separated from the other three treatments primarily according to the higher microbial utilization of carbohydrates, carboxylic acids, polymers, phenolic compounds, and amino acid, while higher utilization of amines/amides differed soil microbial community in NPKS treatment from those in the other three treatments. Redundancy analysis（RDA） indicated that soil organic carbon（SOC） availability, especially soil microbial biomass carbon（Cmic） and Cmic/SOC ratio are the key factors of soil environmental characteristics contributing to the increase of both soil microbial community structure and functional metabolic diversity in the long-term fertilization trial. Our results showed that long-term inorganic fertilizer and swine manure application could significantly improve soil bacterial community structure and soil microbial metabolic activity through the increases in SOC availability, which could provide insights into the sustainable management of China＇s soil resource.

The Function,Future and Support Elements of Farmer Cooperative Economy Organization

The nature of farmer cooperative economy organization( known as FCEO) determines the fact that the economic effects of farmer cooperative economy organization are as important as its social effects. Many experts,however,now would only focus on its economic function, and either neglect or weaken its social influence. Therefore,this paper introduces the theoretical foundation of the farmer cooperative economy organization,and studies the nature of cooperative economics. Based on those typical cases,the future of cooperative organization and four supporting elements were put forward in this paper.

Effect of intestinal function-recovering decoction on treatment of multiple organ dysfunction syndrome in rats

Objective:To analyze the effect of intestinal function-recovering decoction on multiple organ dysfunction syndrome in rats,and to investigate a novel solution to multiple organ dysfunction syndrome.Methods:Multiple organ dysfunction syndrome was induced in 60 Sprague-Dawley rats by intestinal ischemia-reperfusion combined with cecal ligation and puncture.Then these rats were intragastrically administered physiological saline(group Ⅰ,n=20),ampicillin(group Ⅱ,n=20) or intestinal function-recovering decoction(group Ⅲ,n=20).After treatment, serum malondialdehyde and superoxide dismutase levels were compared among three groups. Simultaneously,bacterial culture of various organ tissues was performed and bacterial and endotoxin translocation were observed.Results:Compared with group 1,serum malondialdehyde, alanine aminotransferase and aspartate aminotransferase levels were significantly decreased(all P<0.05) and serum superoxide dismutase level was significantly increased(P<0.05) in the group Ⅲ. However,there were no significant differences in these indices between groups Ⅱ and Ⅲ(P>0.05). The rate of bacterial translocation in the groups Ⅱ and Ⅲ was significantly lower than in the group Ⅰ(P<0.05),and no significant difference was observed between groups Ⅱ and Ⅲ(P>0.05). Conclusions:Intestinal function-recovering decoction can significantly reduce endotoxin and bacterial translocation and stabilize enteral oxidative-antioxidative balance.

抗熔滴型多元有机硅阻燃剂整理锦纶6织物的制备及其性能

为提升锦纶6织物阻燃性能,基于水解缩合反应原理,开发设计多元协效抗熔滴型含磷席夫碱基有机硅阻燃剂,并采用浸渍法对锦纶6织物进行阻燃整理。借助红外光谱、热重分析仪、微型燃烧量热仪、极限氧指数仪、扫描电镜、拉曼光谱及热裂解气质联用仪等技术分别对阻燃锦纶6织物的化学结构、热稳定性、燃烧行为及其燃烧后炭化层与气相热解产物系统研究。结果表明:阻燃锦纶6织物的炭化能力及阻燃性能有效提升,其残炭率可增加至33.9%,且在火焰移开后可快速实现自熄,并未有熔滴产生;相较于锦纶6织物,阻燃锦纶6织物的热释放速率峰值(PHRR)及总释热量(THR)分别下降23.8%及20.4%,火灾安全性有效提升;经水洗20次后,阻燃锦纶6织物仍可实现自熄,其PHRR及THR值相较于锦纶6织物,仍分别下降了14.1%及13.6%。

黄芩提取物对肉鸡生长性能、抗氧化功能及免疫器官指数的影响

文章旨在研究黄芩提取物(Scutellaria Baicalensis Extract,SBE)对肉鸡生长性能、抗氧化功能及免疫器官指数的影响。试验将400只1日龄黄羽肉鸡随机分为4组,参考《黄羽肉鸡营养需求量》(NY/T 3645-2020)饲喂基础日粮,每组4个重复,每个重复25只。各组自由采食和饮水。其中CON组提供清水,其余3组分别在饮水中添加100 mg/L(100 SBE组)、200 mg/L(200 SBE组)、300 mg/L(300 SBE组)的黄芩提取物。试验为期28 d。结果:(1)与CON组相比,200 SBE组、300 SBE组肉鸡末重显著提高7.82%、7.15%(P<0.05),平均日增重显著提高8.50%、7.76%(P<0.05),料重比显著降低8.08%、7.07%(P<0.05)。(2)与CON组相比,100 SBE组、200 SBE组、300 SBE组肉鸡血清T-AOC显著提高(P<0.05),MDA含量显著降低(P<0.05),且SOD活性极显著提高(P<0.01)。(3)与CON组相比,100 SBE组、200 SBE组、300 SBE组肉鸡法氏囊指数显著提高(P<0.05),300 SBE组肉鸡脾脏指数显著提高(P<0.05)。结论:日常饮水中加入黄芩提取物能提高肉鸡生长性能、抗氧化功能及免疫器官指数。综合考虑经济效益和耐受性,黄芩提取物的适宜添加水平为200 mg/L。

肝移植术后肺结核患者免疫状态与主要器官功能的初步分析

目的初步探讨肝移植术后肺结核患者免疫状态与器官功能相较于普通肺结核患者的临床特点,为规范抗结核临床诊疗提供科学依据。方法回顾性收集2014年至2023年期间广州市胸科医院住院患者的资料,以24例肝移植术后肺结核住院患者作为研究组,31例同期非器官移植肺结核住院患者作为对照组。研究组均为男性;年龄37~75岁,平均年龄57岁。对照组均为男性;年龄32~75岁,平均年龄57岁。收集两组就诊后首次血常规、炎症标志物、肝功能、肾功能、心功能、T淋巴细胞亚群等实验室检测指标结果。比较两组上述指标的异常比例、各类白细胞及血小板计数的比率。采用χ^(2)检验和秩和检验。结果研究组白细胞、淋巴细胞、血小板、血红蛋白、γ-谷氨酰转肽酶、肌酐、胱抑素C、肌酸激酶、B型钠尿肽前体以及CD3^(+)、CD4^(+)、CD8^(+)T淋巴细胞亚群检测结果异常率均高于对照组(均P<0.05)。研究组的淋巴细胞-白细胞比率[0.13(0.09,0.17)]、淋巴细胞-中性粒细胞比率[0.17(0.12,0.25)]均低于对照组[0.18(0.12,0.21)、0.26(0.15,0.33)],且单核细胞-淋巴细胞比率[0.59(0.49,0.96)]高于对照组[0.40(0.33,0.63)](均P<0.05)。结论肝移植术后肺结核患者肝、肾、心等主要器官功能受损以及免疫功能低下较多,在临床诊疗过程中须予以高度关注。

高校高水平运动队建设路径的逻辑辨识与行动方略——基于行政型体育组织的考察

从组织管理过程的基本属性行政化入手,依托结构功能主义与组织行为学观点,以个体行动作为逻辑起点,对我国高校高水平运动队实践样态加以剖判并进行类型学建构,归纳其在宏观、中观和微观层面的3类建设路径,由此判辨各路径在建设过程中存在的问题,再结合“制度-利益-观念”概念性框架对其进行消解,进而探索高校高水平运动队未来的行动方略。研究认为,我国高校高水平运动队主要呈现出“层层加码”“水平比码”“主体择码”3类建设路径,且分别存在制度环境的行政力量产生锁入效应、高校职能部门间利益分配的非帕累托改变、行政官员对多重建设目标的选择偏颇问题,而这可从制度的规范引导、利益的有效激励和观念的柔性约束3个方面对其进行改善。

脑卒中后构音障碍患者构音器官运动功能与言语清晰度的相关性

目的 探讨脑卒中后构音障碍患者构音器官运动功能与言语清晰度(SI)之间的关系。方法 选择2020年11月至2023年10月北京博爱医院收治的住院脑卒中后构音障碍患者67例,采用SI测试和Frenchay构音障碍评价(FDA)进行评定,SI≤65%为低SI组,SI> 65%为高SI组。结果 除颌位置外,高SI组FDA各项评分均低于低SI组(Z> 1.543, P <0.05)。FDA各项评分均与SI呈负相关(r <-0.343, P <0.001),其中与唇运动、舌运动和喉控制3项评分的相关性最大(r <-0.6)。结论 脑卒中后构音障碍患者构音器官运动功能与SI相关,特别是唇、舌、喉的功能。

游客需求导向下的酒店功能改进及组织重构

酒店功能与组织是保障酒店能够服务游客并满足需求的核心要素,需要从游客需求视角研究酒店功能与组织。以游客投诉代表游客需求,以之分析酒店功能与组织是研究三者相互关系的可行方法。与游客需求相适应,酒店应具有三层次功能:基础功能、拓展功能与创新功能。三层次功能需要酒店组织重构,需要成立专门的部门或机构来承担拓展功能与创新功能,如综合服务部、业务创新部等,以保证三层次功能的实现。酒店三层次功能及组织设计有益于酒店打造特色、提高市场竞争力。

新时代发挥社会组织功能的多维审视:理念、制度与路径

社会组织的功能发挥是攸关新时代我国社会治理效能的一个重要问题,也是推进国家治理体系和治理能力现代化的内在要求。要充分发挥社会组织作为共建社会治理体系助手、促进共同富裕推手与重塑社会文化帮手等功能,有赖于理念、制度与路径的创新。在理念遵循上,立足非营利属性、基层属性、群众属性,坚持以人为本的价值取向;立足新时代需求和自身使命任务,坚守主动作为的精神信念;立足提升内部治理能力、对外服务能力、学习创新能力,树立自我建设的发展理念。在制度建设上,围绕党建引领下的制度同构、多元主体中的治理嵌入、公共文化中的组织塑造等制度要素,优化社会组织制度环境、激发社会组织活力。在路径选择上,提出建立合作共赢的合作伙伴关系、打造协同发展的社会组织联盟、探索赋能社会组织市场化运作等进路。

阴道封闭术对老年盆腔器官脱垂患者肠道功能的影响及相关因素

目的探讨阴道封闭术对老年盆腔器官脱垂患者肠道功能的影响,分析术后肠道功能改善的相关因素。方法收集2020年6月至2022年6月因盆腔器官脱垂行阴道封闭术患者104例的临床及盆底超声资料,应用盆底功能障碍问卷(PFDI-20)于术前、术后12个月进行肠道症状及生活质量调查,分析肠道症状。结果104例患者中,56.7%(59/104)的患者术前至少存在一项肠道症状,术后38.5%(40/104)的患者至少存在一项肠道症状;其中梗阻性排便功能障碍术后为37.5%(39/104)较术前50.5%(52/104)明显缓解,差异有统计学意义(P<0.05),而失禁性肠道症状和刺激性肠道症状术后发生率较术前虽有下降,但差异无统计学意义(P>0.05)。术前59例有肠道症状者术后62.7%(37/59)得以改善,33.9%(20/59)的患者症状持续存在,3.4%(2/59)的患者出现症状加重。45例术前无任何肠道症状患者中术后出现任一肠道症状7例,术后新发肠道症状发生率为15.6%。术后对阴道封闭术后悔者2例,后悔率1.9%(2/104)。应用PFDI-20中的手助排便和结直肠肛门困扰量表(CRADI-8)评分,梗阻性症状中位评分术前16.67分(16.67,41.67),术后8.33分(0,16.67),术后评分较术前显著下降(P<0.05);而失禁性症状和疼痛/刺激性症状术前与术后比较差异无统计学意义(P>0.05)。多因素分析显示,存在直肠膨出者行阴道封闭术后肠道症状缓解率较高;阴道封闭术同时行会阴体修补是肠道症状缓解的保护因素(OR 0.151,95%CI:0.035~0.645)。结论阴道封闭术可有效改善老年盆腔器官脱垂患者的梗阻性排便症状,新发肠道症状较少见,合并直肠膨出的POP患者行阴道封闭术同时行会阴体修补术有助于缓解肠道症状。

以脉调气理论指导下的脏腑推拿治疗小儿功能性消化不良疗效研究

目的探究以脉调气理论指导下的脏腑推拿治疗小儿功能性消化不良的疗效研究。方法采用随机数字表法将黑龙江中医药大学附属第一医院治未病中心2020年2月—2022年2月收治的106例功能性消化不良患儿分为观察组(53例)与对照组(53例)。对照组采用一般推拿治疗,观察组在此基础上采用“以脉调气”理论指导下的脏腑推拿治疗方法。观察两组患儿治疗前以及治疗20 d后的中医症状积分、血锌浓度水平、胃动素、胃泌素、食欲调节因子水平、尼平消化不良指数。观察两组患儿临床疗效与复发率。结果两组患儿治疗前食后腹胀、纳呆食少、大便异常和面色萎黄的证候积分对比差异无统计学意义(P>0.05)。治疗20 d后观察组食后腹胀、食少纳呆、面色萎黄和大便异常证候积分显著低于对照组(P<0.05)。两组患儿治疗前胃动素、血锌含量、胃泌素水差异无统计学意义(P>0.05)。治疗20 d后观察组胃动素、血锌含量、胃泌素水平显著高于对照组(P<0.05)。两组患儿治疗前Ghrelin、NPY和Leptin水平差异无统计学意义(P>0.05)。治疗20 d后观察组NPY、Ghrelin浓度水平明显较对照组高,而Leptin水平明显较对照组低(P<0.05)。两组患儿治疗前NDI评分差异无统计学意义(P>0.05)。治疗20 d后观察组NDI评分显著低于对照组(P<0.05)。观察组总有效率为90.57%(48/53),显著高于对照组[75.47%(40/53)](χ^(2)=4.283,P=0.039)。观察组复发率为3.77%(2/53)(40/53)略低于对照组9.43%(5/53),但两组复发率差异无统计学意义(χ^(2)=1.377,P=0.241)。结论“以脉调气”理论指导下的脏腑推拿能有效提高临床疗效、提升食欲、调节因子水平、提高生活质量、改善胃动素、血锌含量、胃泌素水平,值得临床推广。

胺功能化的铜催化剂:氢键介导的电化学CO_(2)还原为C_(2)产物以及优越的可充电Zn-CO_(2)电池性能

有机分子功能化是一种有前景的策略,用于调控电化学CO_(2)还原反应(eCO_(2)RR)的C_(2+)产物选择性和活性。然而,我们对于电化学CO_(2)还原调控机制的分子水平理解仍然不够清晰。在本文中,我们成功制备了铜纳米颗粒,并使用一系列胺类衍生物(如十六胺(HAD)、N-甲基十六胺(N-MHDA)、十六烷基二甲胺(HDDMA)和十六酰胺(PMM))对其进行功能化,以系统地研究胺表面活性剂分子结构对eCO_(2)RR选择性和活性的影响。结果表明,HDA的功能化可以将C_(2)产物和C_(2)H_(4)的法拉第效率(FE)提高至73.5%和46.4%,并且在−0.9 V vs.RHE(可逆氢电极)电位下,C_(2)产物的分电流密度为131.4 mA·cm^(−2)。理论研究发现,HDA通过与CO_(2)和eCO_(2)RR中间体之间的氢键相互作用,富集了^(*)CO_(2)、^(*)CO和其他反应中间体,降低了CO―CHO耦合反应的动力学能垒,从而促进了eCO_(2)RR向C_(2)产物的转化。当胺基的H原子被甲基取代后,氢键相互作用减弱,竞争的析氢反应加剧。PMM通过Cu―O键与Cu表面发生键合,而不是通过Cu―N键,导致Cu-PMM更倾向于产乙醇。原位拉曼光谱显示,在Cu-HDA表面,CO主要吸附在Cu的顶位吸附位点上,与在Cu表面上的桥式吸附不同,这可能是因为前者表面对CO的富集引发了CO的吸附构型变化。HDA功能化还提高了Cu催化剂的表面pH。基于Cu-HDA组装的可充电Zn-CO_(2)电池在放电电流密度为16 mA∙cm^(−2)时,最大功率密度为6.48 mW∙cm^(−2),并具有长达60 h的良好充放电稳定性。本研究的重点在于通过在分子水平上调节Cu基材料的CO_(2)RR活性和选择性,促进CO_(2)-C_(2)的转化,这可能为提高C_(2)产物的产率提供新的见解。

蝮蛇咬伤中医治疗优化方案的疗效评价

目的评价中医优化方案治疗蝮蛇咬伤的临床疗效。方法回顾研究蝮蛇咬伤住院患者资料,根据中医治疗方案的不同,将符合纳入标准的病例分为对照组87例、试验组82例,对照组采用未优化中医方案,试验组采用优化中医方案,2组均配合以西医常规治疗,比较2组治疗前后伤肢肿胀疼痛程度、症状与体征积分、炎症指标、脏器功能指标、治愈率、治愈时间。结果在伤肢肿胀疼痛程度及症状消失时间、症状与体征积分方面,试验组治疗效果较对照组更为显著(P<0.05);2组治疗后6 d,WBC、N%、CRP、ALT、AST、Cr、NGAL、CK-MB指标均降低(P<0.05),试验组CRP、ALT、AST、Cr、NGAL指标较对照组降低更明显(P<0.05),但在降低CK-MB方面,2组效果相当,无明显差异(P>0.05);治愈率方面:试验组(97.56%,80/82)显著高于对照组(88.51%,77/87)(P<0.05),治愈时间方面:试验组较对照组用时更短(P<0.05)。结论中医优化方案能快速缓解蝮蛇咬伤肢体肿痛及全身症状、减轻机体炎症反应、改善重要脏器功能,临床效果好,值得推广应用。