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增温强度对晋北赖草草地CH_(4)通量的影响

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草地学报 2024年第1期32卷 113-120页

作者：彭洁卢英帅齐志远燕学东武帅楷郝杰陈晓鹏山西农业大学草业学院山西太谷030801 草地生态保护与乡土草种质创新山西省重点实验室山西太谷030801 山西右玉黄土高原草地生态系统国家定位观测研究站山西右玉037200

温度变化通过影响土壤甲烷代谢微生物及相关酶的活性进而影响草地生态系统CH_(4)通量。为明确晋北赖草(Leymus secalinus)草地生态系统CH_(4)通量随气温升高的变化趋势及机理,采用开顶箱法(Open top chambers, OTCs)设置5个梯度的增温处... 详细信息

温度变化通过影响土壤甲烷代谢微生物及相关酶的活性进而影响草地生态系统CH_(4)通量。为明确晋北赖草(Leymus secalinus)草地生态系统CH_(4)通量随气温升高的变化趋势及机理,采用开顶箱法(Open top chambers, OTCs)设置5个梯度的增温处理,对增温第4年各处理生长季CH4通量及其影响因素进行测定。结果表明:增温显著提高了空气温度,但随着空气温度的增加,土壤温度和土壤体积含水量无显著变化;生长季晋北赖草草地生态系统是弱的大气CH_(4)汇,其CH_(4)平均吸收速率为(6.42±5.63)μg·m^(-2)·h^(-1);增温显著影响CH_(4)通量和pmoA功能基因丰度,与对照相比,只有W1处理促进CH4吸收通量;冗余分析表明土壤体积含水量是同时影响pmoA基因丰度和CH_(4)吸收速率的关键因子。本研究可为预测未来气候变暖情境下草地生态系统CH4通量变化提供理论依据。

关键词： OTC 温室气体功能基因甲烷吸收

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大中型粮食烘干设备研究进展

粮油食品科技 2024年第2期32卷 171-177页

作者：王延坤陈鹏枭朱文学蒋萌蒙朱玉格靳英哲王晓弯河南工业大学粮食和物资储备学院河南郑州450001

随着农业科技的进步,粮食烘干设备在粮食加工过程中得到广泛应用。而关于粮食烘干的研究大多集中在工艺优化上,对于粮食烘干设备的研究较少,导致新型工艺技术难以应用,粮食烘干设备的进步受到制约。目前应用于粮食烘干的有热风、热泵、... 详细信息

随着农业科技的进步,粮食烘干设备在粮食加工过程中得到广泛应用。而关于粮食烘干的研究大多集中在工艺优化上,对于粮食烘干设备的研究较少,导致新型工艺技术难以应用,粮食烘干设备的进步受到制约。目前应用于粮食烘干的有热风、热泵、远红外、太阳能、真空、微波以及联合干燥设备,本文从工作原理、干燥效率、干后品质、能源消耗、发展趋势等方面对以上粮食干燥技术及其设备进行综述,介绍了节能环保、智能调控的新型干燥设备的研究现状,分析了各种大中型粮食烘干设备及技术存在的问题,并对粮食烘干设备的发展趋势提出建议,以期为粮食烘干产业健康发展提供参考。

关键词：粮食干燥技术烘干设备联合干燥热泵远红外太阳能真空微波

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不同类型草原土壤净氮矿化速率的温度敏感性

植物生态学报 2024年第4期48卷 523-533页

作者：王袼胡姝娅李阳陈晓鹏李红玉董宽虎何念鹏王常慧山西农业大学草业学院草地生态保护与乡土草种质创新山西省重点实验室山西太谷030801 中国科学院植物研究所植被与环境变化国家重点实验室北京100093 中国科学院地理科学与资源研究所生态系统网络观测与模拟重点实验室北京100101

土壤中的无机氮是维持陆地生态系统生产力的主要限制因子,主要通过有机氮的矿化产生。土壤氮可利用性的高低取决于土壤微生物、地上植被类型以及土壤理化性质等。土壤微生物对环境变化极为敏感,尤其是温度与微生物生长繁殖密切相关。因... 详细信息

土壤中的无机氮是维持陆地生态系统生产力的主要限制因子,主要通过有机氮的矿化产生。土壤氮可利用性的高低取决于土壤微生物、地上植被类型以及土壤理化性质等。土壤微生物对环境变化极为敏感,尤其是温度与微生物生长繁殖密切相关。因此,在较大空间范围内研究微生物调控氮矿化速率的温度敏感性(Q_(10))对于预测全球气候变化对陆地生态系统生产力的影响至关重要。该研究以中国三大高原(内蒙古高原、黄土高原和青藏高原)的不同类型草原为研究对象,通过野外采集土壤样品,室内不同温度培养测定三大高原不同类型草地土壤的净氮矿化速率,计算其Q_(10),并分析其与土壤微生物及土壤理化性质参数的相关性。结果表明:(1)黄土高原不同类型草地土壤氮矿化速率的Q_(10)显著高于内蒙古高原和青藏高原;(2)在黄土高原和内蒙古高原,草甸草原和典型草原土壤净氮矿化速率的Q_(10)显著高于荒漠草原,而青藏高原高寒草甸草原土壤净氮矿化速率的Q_(10)显著低于高寒典型草原和高寒荒漠草原;(3)三大高原草地土壤微生物生物量碳含量与土壤净氮矿化速率的Q_(10)显著相关;(4)Q_(10)的空间格局受微生物、土壤质地以及底物的共同调控。该研究结果为中国不同类型草原土壤氮循环对全球变化响应的研究提供了重要数据,对于陆地生态系统氮循环模型的完善具有一定的科学价值。

关键词：氨氧化微生物微生物生物量碳微生物生物量氮净氮矿化速率温度敏感性(Q_(10))

自动充氮蒸馏-酸碱滴定法测定食品中二氧化硫

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食品安全质量检测学报 2024年第9期15卷 232-239页

作者：陈晓鹏黄高琳吴瑞岩广东产品质量监督检验研究院佛山528300 广东药科大学食品科学学院中山528405

目的建立自动充氮蒸馏-酸碱滴定法测定食品中二氧化硫残留量的分析方法。方法称取20 g(或m L)均质试样,加入350 mL纯水后进行充氮酸化蒸馏,以50 mL 3%过氧化氢溶液为吸收液,加盐酸溶液(6 mol/L)10 mL,氮气流量1.50 L/min,蒸馏时间90 m... 详细信息

目的建立自动充氮蒸馏-酸碱滴定法测定食品中二氧化硫残留量的分析方法。方法称取20 g(或m L)均质试样,加入350 mL纯水后进行充氮酸化蒸馏,以50 mL 3%过氧化氢溶液为吸收液,加盐酸溶液(6 mol/L)10 mL,氮气流量1.50 L/min,蒸馏时间90 min,微沸功率350 W,用0.01 mol/L或0.1 mol/L氢氧化钠标准溶液进行滴定。结果增加纯水添加量使测定结果轻微下降。加标实验有基质选择性,亚硫酸钠溶液的储存时间与加标回收率负相关。乙酸是阳性干扰物,能使检测结果显著偏高。本方法的相对标准偏差为0.5%~2.1%,回收率范围为86.0%~96.3%,最低检出限和定量限为0.5 mg/kg和5 mg/kg。对9类98批食品进行检测,结果显示百合干和淮山干的检出率与超标率最高。结论该方法稳定、操作简便,测定结果准确度高、精密度好,适用于食品(不含乙酸)中二氧化硫残留量的测定。

关键词：二氧化硫酸碱滴定条件优化基质选择干扰

锁扣带袢钛板与单枚皮质骨螺钉治疗下胫腓损伤的疗效对比研究

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中国骨与关节杂志 2024年第6期13卷 424-429页

作者：李林张浩陈楚鹰陈晓鹏何久盛北京市顺义区医院骨外二科

目的比较锁扣带袢钛板和单枚皮质骨螺钉治疗踝关节骨折中下胫腓损伤的临床疗效。方法回顾分析 2020 年 1 月至 2022 年 1 月我院治疗的 61 例踝关节骨折伴下胫腓损伤患者的临床资料，根据下胫腓固定方法的不同分为锁扣带袢钛板组 (A ... 详细信息

目的比较锁扣带袢钛板和单枚皮质骨螺钉治疗踝关节骨折中下胫腓损伤的临床疗效。方法回顾分析 2020 年 1 月至 2022 年 1 月我院治疗的 61 例踝关节骨折伴下胫腓损伤患者的临床资料，根据下胫腓固定方法的不同分为锁扣带袢钛板组 (A 组) 与单枚皮质骨螺钉组 (B 组)。其中 A 组 28 例，B 组 33 例，比较两组患者早、中远期功能结果，下胫腓联合影像学变化，手术时间，住院时间及并发症，分析影响早期踝关节功能的危险因素。结果术后 1 个月 A 组踝关节活动度评分 (17.2±1.2) 分高于 B 组 (15.8±2.3) 分，差异有统计学意义 (P=0.005)。术后 3 个月 A 组美国足踝外科协会 (American Orthopedic Foot and Ankle Society，AOFAS) 评分为 91 (80～98) 分，高于 B 组 80 (68～87) 分，差异有统计学意义 (P=0.003)；术后 6 个月、12 个月时两组 AOFAS 评分比较差异无统计学意义 (P > 0.05)。术后 1 个月和 3 个月两组下胫腓间隙和下胫腓重叠距离与出院前比较差异无统计学意义 (P > 0.05)。两组患者手术时间、住院时间、并发症比较差异均无统计学意义 (P > 0.05)。螺钉固定是术后 1 个月踝关节活动度 < 15 分 (P=0.011) 和术后 3 个月踝关节 AOFAS 评分 < 90 分 (P=0.032) 的独立危险因素。结论锁扣带袢钛板治疗踝关节骨折中下胫腓联合损伤与单枚皮质骨螺钉同样安全有效，但早期功能结果优于螺钉固定，中长期结果相当，螺钉固定是影响早期功能结果的独立危险因素。

关键词：踝关节骨折骨折固定术,内下胫腓联合损伤

Methods,Mechanisms,and Application Prospects for Enhancing Extracellular Vesicle Uptake

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Current Medical Science 2024年第2期44卷 247-260页

作者： Ying-peng XU Tao JIANG xiao-fan YANG Zhen-bing chen Department of Hand Surgery Union HospitalTongji Medical CollegeHuazhong University of Science and TechnologyWuhan430022China

Extracellular vesicles(EVs)are considered to be a new generation of bioinspired nanoscale drug delivery systems due to their low immunogenicity,natural functionality,and excellent biocompatibility.However,limitations such as low uptake efficiency,insufficient production,and inhomogeneous performance undermine their potential.To address these issues,numerous researchers have put forward various methods and applications for enhancing EV uptake in recent decades.In this review,we introduce various methods for the cellular uptake of EVs and summarize recent advances on the methods and mechanisms for enhancing EV uptake.In addition,we provide further understanding regarding enhancing EV uptake and put forward prospects and challenges for the development of EV-based therapy in the future.

关键词： extracellular vesicles exosomes extracellular vesicle uptake extracellular vesiclebased therapy

Comparison of laser epithelial keratomileusis and photorefractive keratectomy for the correction of myopia： a meta-analysis

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Chinese Medical Journal 2008年第22期121卷 2331-2335页

作者： CUI Min chen xiao-ming LU peng Department of Ophthalmology West China Hospital Sichuan University Chengdu Sichuan 610041 China

Background It is unclear whether a laser epithelial keratomileusis （LASEK） has any significant advantage over a photorefractive keratectomy （PRK） for correcting myopia. We undertook this meta-analysis of randomized controlled trials to examine possible differences in efficacy, accuracy, safety and side-effects between two methods, LASEK and PRK, for correcting myopia. Methods A systematic literature retrieval was conducted in the PubMed, EMBASE, Chinese Bio-medicine Database, and Cochrane Controlled Trials Register to identify potentially relevant randomized controlled trials. The statistical analysis was performed using a RevMan 4.2 software. The results included efficacy outcomes （proportion of eyes with uncorrected visual acuity （UCVA）〉 20/20 at 1 month and 12 months post-treatment）, accuracy outcomes （proportion of eyes within ±0.50 diopters （D） of target refraction at 1 month and 12 months post-treatment）, safety outcomes （loss of 〉2 lines of best spectacle-corrected visual acuity （BSCVA） at 〉 6 months post-treatment）, mean pain scores on day 1 post-treatment, and mean corneal haze scores at 6 and 12 months post-treatment. Results Seven articles describing a total of 604 eyes with myopia from 0 to -9.0 D were identified in this meta-analysis. The combined results showed that the efficacy and accuracy outcomes between the two groups at 1 month and 12 months post-treatment were comparable. No patient lost 〉 2 lines of BSCVA at 〉 6 months post-treatment in four relevant trials. Compared with PRK, LASEK did not relieve discomfort on day 1 post-treatment or reduce corneal haze intensity at 6 and 12 months post-treatment. Conclusions According to the available data, LASEK does not appear to have any advantage over PRK for correcting myopia from 0 to -9.0 D. This meta-analysis focuses mainly on the comparison of the early, mid-term and mid-long term results of the two methods. Additional studies to compare the long-term （〉one year） results should be considered.

关键词： laser epithelial keratomileusis photorefractive keratectomy myopia meta-analysis

Low-energy-consumption temperature swing system for CO_(2) capture by combining passive radiative cooling and solar heating

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Green Energy & Environment 2024年第3期9卷 507-515页

作者： Ying-Xi Dang peng Tan Bin Hu chen Gu xiao-Qin Liu Lin-Bing Sun State Key Laboratory of Materials-Oriented Chemical Engineering Jiangsu National Synergetic Innovation Center for Advanced Materials(SICAM)College of Chemical EngineeringNanjing Tech UniversityNanjing211816China

Temperature-swing adsorption(TSA)is an effective technique for CO_(2) capture,but the temperature swing procedure is energy-intensive.Herein,we report a low-energy-consumption system by combining passive radiative cooling and solar heating for the uptake of CO_(2) on commercial activated carbons(CACs).During adsorption,the adsorbents are coated with a layer of hierarchically porous poly(vinylidene fluoride-co-hexafluoropropene)[P(VdF-HFP)HP],which cools the adsorbents to a low temperature under sunlight through radiative cooling.For desorption,CACs with broad absorption of the solar spectrum are exposed to light irradiation for heating.The heating and cooling processes are completely driven by solar energy.Adsorption tests under mimicked sunlight using the CACs show that the performance of this system is comparable to that of the traditional ones.Furthermore,under real sunlight irradiation,the adsorption capacity of the CACs can be well maintained after multiple cycles.The present work may inspire the development of new temperature swing procedures with little energy consumption.

关键词： CO_(2)capture Solar heating Passive radiative cooling Temperature swing adsorption

The homogenous growth of Co-based coordination compound on graphene nanosheet for high-performance K-organic battery and its reaction mechanism

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Rare Metals 2024年第4期43卷 1622-1634页

作者： Qian-Qian peng Yi-Ting Wang Shuo Qi Yao xiao Yong Wang Shuang-Qiang chen School of Environmental and Chemical Engineering Shanghai University School of Chemistry and Materials Engineering Wenzhou University

Metal coordination compounds（MCCs） are gaining popularity for potassium-ion batteries（PIBs）owing to their tuneable structure,multiple reaction sites,low cost and unique morphology.However,they are generally subjected to intrinsic features of the sluggish ionic diffusion coefficient,low electronic conductivity and slow kinetics.Herein,a new MCC material of cobalt-1,3,5-trioxy-2,4,6-triamino-benzo（Co-TB） coordination compound was synthesized and homogenously grown on the surface of graphene nanosheets（GNS）,forming a Co-TB@GNS composite with enhanced electronic conductivity and flexible capability.Benefiting from the overall enhanced conductivity,high surface area and abundant activated K-storage sites,Co-TB@GNS electrodes have exhibited superior cycling performance with high reversible capacities(312 mAh·g-1after 100 cycles at 100 mA·g-1,224 mAh·g-1after 500 cycles at 1 A·g-1) and better rate performances compared with the pure Co-TB compound when served as PIB's anodes.Furthermore,multiple in-situ measurement techniques have jointly confirmed that the organic functional groups（C=O,C=N and C=C of benzene rings） and Co2+in Co-TB are the main reversible K-storage sites,including in-situ Fourier transform infrared spectroscopy（FTIR） and X-ray diffraction（XRD）,and partial capacity contribution is originated from GNS by the apparent K-storage behavior in the in-situ XRD pattern,proving the possibility of K-storage for metal-organic materials.

关键词： Metal coordination compounds Potassium-ion battery Cobalt coordination compound K-storage mechanism