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A New Solvent-free Synthesis of a, a'-Dibenzylidenecycloalkanones from Acetals with Cycloalkanones under Microwave Irradiation

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Chinese Chemical Letters 2003年第4期14卷 333-334页

作者： dan feng HUANG Jin Xian WANG Yu Lai HU College of Chemistry&Chemical Engineering Northwest Normal UniversityLanzhou 730070

A new rapid synthetic method is described for synthesis of a, a-dibenzylidene- cycloalkanones by the reaction of acetals and cycloalkanones without solvent using BF3稥t2O as catalyst under microwave irradiation.

关键词： Cycloalkanone acetal Lewis acid microwave irradiation.

CD7在儿童急性髓细胞性白血病中表达的临床意义

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中国现代医生 2024年第12期62卷 28-31页

作者：李争朱洁冯丹梁昌达江西省儿童医院血液科江西南昌330006 江西省儿童医院肾内科江西南昌330006 江西省儿童医院普外科江西南昌330006

目的探讨CD7在儿童急性髓细胞性白血病(acute myeloid leukemia,AML)中表达的临床意义。方法回顾性分析2016年10月至2020年12月江西省儿童医院收治的60例AML患儿资料,根据免疫分型结果分为CD7阳性(CD7^(+))组和CD7阴性(CD7^(-))组,对比... 详细信息

目的探讨CD7在儿童急性髓细胞性白血病(acute myeloid leukemia,AML)中表达的临床意义。方法回顾性分析2016年10月至2020年12月江西省儿童医院收治的60例AML患儿资料,根据免疫分型结果分为CD7阳性(CD7^(+))组和CD7阴性(CD7^(-))组,对比两组患儿的临床特征、免疫表型及治疗效果。结果60例AML患儿中,CD7^(+)18例,阳性率为30.00%;以M2及M5为主,其中M2的表达率为55.56%,高于其他亚型。CD7^(+)组患儿的白细胞计数及骨髓原始粒细胞计数显著高于CD7^(-)组(P0.05)。患儿均接受标准诱导化疗方案治疗1个疗程后,CD7^(+)组的完全缓解率低于CD7^(-)组(P0.05)。结论与CD7^(-)患儿比较,CD7^(+)患儿外周白细胞计数和骨髓原始细胞计数均显著增高,且第1疗程的完全缓解率显著降低。CD7抗原表达对AML患儿的不良预后具有显著的预测价值,可能为AML患儿的治疗策略提供新的思路,并为进一步探索CD7在AML发展中的作用机制奠定基础。

关键词： CD7 儿童急性髓细胞性白血病临床意义

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Development and drought tolerance assay of marker-free transgenic rice with OsAPX2 using biolistic particle-mediated co-transformation

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The Crop Journal 2017年第4期5卷 271-281页

作者： dan feng Yanwei Wang Jinxia Wu Tiegang Lu Zhiguo Zhang Biotechnology Research Institute/National Key Facility for Crop Gene Resources and Genetic Improvement Chinese Academy of Agricultural Sciences Beijing 100081 China

Abiotic stresses such as drought, salinity, and low temperature cause–losses in rice production worldwide. The emergence of transgenic technology has enabled improvements in the drought resistance of rice plants and helped avert crop damage due to drought *** marker genes conferring resistance to antibiotics or herbicides have been widely used to identify genetically modified plants. However, the use of such markers has limited the public acceptance of genetically modified organisms. Marker-free materials (i.e., those containing a single foreign gene) may be more easily accepted by the public and more likely to find common use. In the present study, we created marker-free drought-tolerant transgenic rice plants using particle bombardment. Overall, 842 T_0plants overexpressing the rice ascorbate peroxidase-coding gene OsAPX2 were generated. Eight independentmarker-free lines were identified from T_1 seedlings using the polymerase chain *** molecular characteristics of these lines were examined, including the expression level,copy number, and flanking sequences of OsAPX2, in the T_2 progeny. A simulated drought test using polyethylene glycol and a drought-tolerance test of seedlings confirmed that the marker-free lines carrying OsAPX2 showed significantly improved drought tolerance in seedlings. In the field, the yield of the wild-type plant decreased by 60% under drought conditions compared with normal conditions. However, the transgenic line showed a yield loss of approximately 26%. The results demonstrated that marker-free transgenic lines significantly improved grain yield under drought-stressed conditions.

关键词： Rice Particle bombardment-mediated co-transformation Marker-free Drought-tolerance

五行情志调护联合中西医饮食调配预防胸腰椎压缩性骨折患者便秘的效果

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临床医药实践 2024年第3期33卷 222-225页

作者：奉丹许珂媛郑燕玲广州中医药大学第三附属医院广东广州510240

目的:探讨五行情志调护联合中西医饮食调配预防胸腰椎压缩性骨折患者便秘的效果。方法:选择广州中医药大学第三附属医院2021年1月—2022年12月胸腰椎压缩性骨折便秘患者80例,按照随机数表法分为两组,每组40例。对照组给予常规护理干预,... 详细信息

目的:探讨五行情志调护联合中西医饮食调配预防胸腰椎压缩性骨折患者便秘的效果。方法:选择广州中医药大学第三附属医院2021年1月—2022年12月胸腰椎压缩性骨折便秘患者80例,按照随机数表法分为两组,每组40例。对照组给予常规护理干预,观察组给予五行情志调护联合中西医饮食调配干预。观察两组心理状态、便秘发生情况和便秘症状评分。结果:干预前两组患者焦虑自评量表(SAS)、抑郁自测表(SDS)评分比较,差异无统计学意义(P>0.05)。干预2周后,观察组便秘症状各维度评分低于对照组,差异有统计学意义。干预2周后,两组和SAS及SDS评分均低于干预前,且观察组低于对照组,差异有统计学意义(P<0.05)。干预2周后观察组便秘发生率低于对照组,差异有统计学意义(P<0.05)。结论:五行情志调护联合中西医饮食调配应用于胸腰椎压缩性骨折患者,可降低便秘发生率,改善患者便秘情况和心理状态。

关键词：五行情志调护胸腰椎压缩性骨折中西医饮食调配便秘

Role of flavonoids in plant interactions with the environment and against human pathogens-A review

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Journal of Integrative Agriculture 2019年第1期18卷 211-230页

作者： Muhammad Khalid Saeed-ur-Rahman Muhammad Bilal HUANG dan-feng School of Agriculture and Biology Shanghai Jiao Tong University School of Life Science and Food Engineering Huaiyin Institute of Technology

Flavonoids are widely-distributed polyphenolic secondary metabolites with diverse biological activities in plants and benefit human health as protective dietary *** participate in plants' responses to harsh environmental conditions and effectively regulate the cell differentiation and *** plants,the majority of their functions are attributed to their strong antioxidative ***,dietary flavonoids protect the human body against free radicals which are associated with the development of cancer and *** rich in polyphenols have been used to cure various diseases because of their antibacterial,antiviral,antifungal and anticancer *** review summarizes the up-to-date research trends and development on flavonoids and its derivatives,working mechanisms and potential functions and applications particularly in relation to plant protection and human *** the end,notable concluding remarks with a close-up look at the future research directions have also been presented briefly.

关键词： flavonoids structure and composition biological activity plant protection human health antimicrobial

某海上平台硫化氢应力腐蚀开裂及氢致开裂腐蚀敏感性分析

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全面腐蚀控制 2024年第3期38卷 113-117,121页

作者：王健申得济武丹峰杨召中海油安全技术服务有限公司天津300456

海上某平台在开发后期发现工艺流程中出现硫化氢,考虑到平台设计时未按照硫化氢平台进行设计,为保证平台设备的安全性,通过硫化氢、硫化物和pH检测,确定了主要工艺流程中设备的湿硫化氢环境类型。根据硫化物应力腐蚀开裂及氢致开裂的相... 详细信息

海上某平台在开发后期发现工艺流程中出现硫化氢,考虑到平台设计时未按照硫化氢平台进行设计,为保证平台设备的安全性,通过硫化氢、硫化物和pH检测,确定了主要工艺流程中设备的湿硫化氢环境类型。根据硫化物应力腐蚀开裂及氢致开裂的相关试验标准对处于硫化氢环境下设备开展了敏感性验证,试验结果表明,当前硫化氢含量下,平台设备具有抵抗硫化氢腐蚀的能力。

关键词：平台硫化氢应力腐蚀开裂氢致开裂

Copper-mediated 1,4-conjugation reaction of functionalized alkylzinc iodides with derivatives of β-nitrostyrene

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Chinese Chemical Letters 2007年第9期18卷 1040-1042页

作者： dan feng Huang Yu Lai Hu Jin Xian Wang College of Chemistry & Chemical Engineering Northwest Normal University Lanzhou 730070 China

Functionalized alkylzinc iodides will undergo 1,4-conjugation reaction with derivatives of β-nitrostyrene in the presence of Cu(OAc)2/LiCl to afford a polyfunctional nitro-compound in high yield.

关键词： 1,4-Conjugation reaction Cu(OAc)2/LiCl Organozinc iodide β-Nitrostyrenes

ROCO:Using a Solid State Drive Cache to Improve the Performance of a Host-Aware Shingled Magnetic Recording Drive

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Journal of Computer Science & Technology 2019年第1期34卷 61-76页

作者： Wen-Guo Liu Ling-Fang Zeng dan feng Kenneth B.Kent School of Computer Science and Technology Huazhong University of Science and TechnologyWuhan 430074China Faculty of Computer Science University of New BrunswickFrederictonE3B 5A3Canada

Shingled magnetic recording (SMR)can effectively increase the capacity of hard disk drives (HDDs).Hostaware SMR (HA-SMR)is expected to be more popular than other SMR models because of its backward compatibility and new SMR-specific ***,an HA-SMR drive often suffers performance degradation under write-intensive workloads because of frequent non-sequential writes buffered in the disk *** non-sequential writes mainly come from update writes,small random writes and out-of-order *** this paper,we propose a hybrid storage system called ROCO which aims to use a solid state drive (SSD)cache to improve the performance of an HA-SMR *** reorders out-of-order writes belonging to the same zone and uses the SSD cache to absorb update writes and small random *** also design a data replacement algorithm called CREA for the SSD *** first conducts zone-oriented hot/cold data identification to identify cold-cached zones and hot-cached zones,and then evicts data blocks belonging to colder zones with higher priorities that can be sequentially written or written through host-side read-modify-write *** gives the lowest priority to data blocks belonging to the hottest-cached zone that have to be non-sequentially *** results show that ROCO can effectively reduce non-sequential writes to the HA-SMR drive and improve the performance of the HA-SMR drive.

关键词： solid state reordering zone-oriented drive (SSD)cache host-aware shingled magnetic recording (HA-SMR)drive zone-oriented block hot/cold data identification data replacement algorithm

Adsorption–desorption behavior of atrazine on agricultural soils in China

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Journal of Environmental Sciences 2017年第7期29卷 180-189页

作者： Lin Yue ChengJun Ge dan feng Huamei Yu Hui Deng Bomin Fu School of Environment and Plant Protection Hainan UniversityHaikou 570228China Key Laboratory of Protection and Development Utilization of Tropical Crop Germplasm Resources(Hainan University) Ministry of EducationHaikou 570228HainanChina

Adsorption and desorption are important processes that affect atrazine transport,transformation,and bioavailability in *** this study,the adsorption–desorption characteristics of atrazine in three soils（laterite,paddy soil and alluvial soil） were evaluated using the batch equilibrium *** results showed that the kinetics of atrazine in soils was completed in two steps：a＂fast＂ adsorption and a ＂slow＂ adsorption and could be well described by pseudo-second-order *** addition,the adsorption equilibrium isotherms were nonlinear and were well fitted by Freundlich and Langmuir *** was found that the adsorption data on laterite,and paddy soil were better fitted by the Freundlich model;as for alluvial soil,the Langmuir model described it *** maximum atrazine sorption capacities ranked as follows：paddy soil 〉 alluvial soil 〉 *** of thermodynamic calculations indicated that atrazine adsorption on three tested soils was spontaneous and *** desorption data showed that negative hysteresis ***,lower solution pH value was conducive to the adsorption of atrazine in *** atrazine adsorption in these three tested soils was controlled by physical adsorption,including partition and surface *** lower equilibrium concentration,the atrazine adsorption process in soils was dominated by surface adsorption;while with the increase of equilibrium concentration,partition was predominant.

关键词： Atrazine Adsorption Desorption Agricultural soils