检索结果-南通市图书馆

Hepatobiliary & Pancreatic Diseases International 2024年第2期23卷 217-220页

作者： song-feng yu Wei-Chen Zhang Jun yu Department of Hepatobiliary and Pancreatic Surgery the First Affiliated HospitalZhejiang University School of MedicineHangzhou 310003China

Full laparoscopic liver resection has been performed widely since it was introduced in the early *** has been expanded from initial for partial resection of the anterolateral segments to non-restriction of area of the liver[1–3].Anatomical liver resec-tion is considered to have potential superiority than non-anatomic resection in terms of tumor prognosis,thus it is more often rec-ommended in the treatment of hepatocellular carcinoma[4,5].Recently,laparoscopic segmental liver resection according to the Couinaud classification has been widely performed due to its ad-vantages in minimal invasiveness and tumor prognosis.

关键词： resection liver hepatic

饲料中虾青素对凡纳滨对虾雌虾肝胰腺脂代谢和卵巢发育的影响

在线全文

学校读者我要写书评

暂无评论

水生生物学报 2024年第1期48卷 99-108页

作者：吴亚顺徐斌刘嘉欣罗智宋玉峰华中农业大学水产学院分子营养实验室武汉430070 广东海大集团股份有限公司广州511400

研究旨在探讨不同虾青素水平对凡纳滨对虾(Litopenaeus vannamei)雌虾肝胰腺脂代谢和卵巢发育的影响。实验设计了4种不同虾青素含量(0、40、80和120 mg/kg)的等氮等能饲料,并进行了30d的投喂试验。结果显示,与对照组相比,80 mg/kg组显... 详细信息

研究旨在探讨不同虾青素水平对凡纳滨对虾(Litopenaeus vannamei)雌虾肝胰腺脂代谢和卵巢发育的影响。实验设计了4种不同虾青素含量(0、40、80和120 mg/kg)的等氮等能饲料,并进行了30d的投喂试验。结果显示,与对照组相比,80 mg/kg组显著提高雌虾增重率、性腺指数和平均产卵量(P0.05),并伴有肝胰腺萎缩现象。添加80 mg/kg虾青素能显著增加T-AOC活性和T-SOD含量(P<0.05),提高雌虾抗氧化能力。添加80 mg/kg虾青素还能显著降低肝胰腺中SFA的含量(P<0.05),显著提高MUFA、EPA和ARA的含量(P<0.05),降低雌虾肝胰腺中fas和srebp1的表达(P<0.05),并提高fabp1和fatp的表达(P<0.05)。通过对卵巢组织进行转录组分析发现,差异表达基因主要涉及“类固醇激素合成”“甘油磷脂代谢”“谷胱甘肽代谢”等途径。此外,与对照组相比,80 mg/kg组在gls、pla2和mfe等氨基酸代谢和类固醇激素合成相关基因表达量显著上调(P<0.05),而在120 mg/kg组显著下调(P<0.05)。综上所述,研究表明,在凡纳滨对虾雌虾饲料中添加80 mg/kg虾青素,能减少脂肪酸合成和沉积,促进脂肪酸的吸收转运;更能够促进雌虾性腺发育及相关基因表达,提高雌虾繁殖性能。

关键词：虾青素脂代谢卵巢发育转录组凡纳滨对虾

维普期刊数据库博看期刊

在线全文

学校读者我要写书评

暂无评论

室内放射性污染的风险与限量管控

中国标准化 2024年第7期 239-242页

作者：宋玉峰王华山东省产品质量检验研究院

近年来随着社会经济的快速发展,人们对装饰装修的要求越来越高。装饰装修在美化室内环境和愉悦身心的同时,也可能对公众健康安全带来风险。放射性污染已成为当前居室环境安全的重要风险之一,同时公众对室内环境中放射性污染相关风险知... 详细信息

近年来随着社会经济的快速发展,人们对装饰装修的要求越来越高。装饰装修在美化室内环境和愉悦身心的同时,也可能对公众健康安全带来风险。放射性污染已成为当前居室环境安全的重要风险之一,同时公众对室内环境中放射性污染相关风险知识缺乏了解,其潜在健康风险在公众中引起严重的消费焦虑。本文梳理了居室内主要放射性污染的风险因素、危害类型及来源、我国现行多级风险指标的限量管控标准,并分析了近期国内相关研究的现状结果。结果表明,合标合规的产品放射性污染的健康风险在安全限量范围之内,不会危及公众健康安全。

关键词：放射性风险管控室内污染健康风险

Variability of Pesticide Residues in Vegetables from the Marketplaces in Jinan City

在线全文

学校读者我要写书评

暂无评论

Agricultural Sciences in China 2011年第10期10卷 1646-1652页

作者： song yu-feng LU Xiao REN feng-shan Central Laboratory of Shandong Academy of Agricultural Sciences/Key Laboratory of Test Technology on Food Quality and Safety of Shandong Province Jinan 250100 P.R.China Institute of Agricultural Quality Standards and Testing Technology Shandong Academy of Agricultural Sciences Jinan 250100 P.R. China

In order to provide technological support for risk estimation of pesticide residues taken from vegetables, the residues of pesticide in vegetables in Jinan City, China, were investigated. Moreover, the variability of pesticide residues in vegetables was explored, and the variability factor was calculated. The level of pesticide residue was studied by statistical method. The variability factor was calculated using the Harrell-Davis method in accordance with principles recommended by the JMPR. In addition, the procedure of evaluation was validated according to the principles laid down by the JMPR （Joint Meeting on Pesticide Residues）. The detection rate of pesticide residues in all marketplace samples was less than 20% in Jinan City. The unqualified rate of vegetables was low （0.6%）. The chlorothalonil was found as the pesticide with the highest rate of detection. The vegetables with the highest rate of pesticide residues detected were leafy vegetables. The relationship between variability factor and mean value of concentrations of contaminations was expressed by the formula, v=4.9×Cmean. The pesticide residues in vegetables from Jinan City is low. The evaluated variability factor is larger than that the value recommended by the JMPR, however, less than the default value used for acute intake assessment of pesticide residues in UK in most cases.

关键词： variability variability factor risk assessment pesticide residues

Mechanical property of artificial methane hydrate under triaxial compression

在线全文

学校读者我要写书评

暂无评论

Journal of Natural Gas Chemistry 2010年第3期19卷 246-250页

作者： Yongchen song feng yu Yanghui Li Weiguo Liu Jiafei Zhao Key Laboratory of Ocean Energy Utilization and Energy Conservation of Ministry of Education Dalian University of Technology Dalian 116024 Liaoning China

Methane production from hydrate reservoir may induce seabed slide and deformation of the hydrate-bearing *** research on mechanical properties of methane hydrate is considered to be important for developing an efficient methane exploitation *** this paper,a triaxial test system containing a pressure crystal device was developed with the conditions to stabilize the hydrate.A series of triaxial shear tests were carried out on artificial methane hydrate *** addition,mechanical characteristics of methane hydrate were studied with the strain rates of 0.1 and 1.0 mm/min,respectively,under the conditions of different temperatures（T =-5,-10,and-20 ℃） and confining pressures（P = 0,5,10,15,and 20 MPa）.The preliminary results show that when the confining pressure was less than 10 MPa,the increase of confining pressure leaded to the enhancement of shear ***,the decreasing temperature and the increasing strain rate both caused the increase in shear strength.

关键词： triaxial mechanical properties confining pressure temperature strain rate

在线全文

学校读者我要写书评

暂无评论

技术标准的比较和评价

中国标准化 2024年第1期 69-72页

作者：宋玉峰王华杨胜坤山东省产品质量检验研究院

社会经济的高质量发展对产品质量安全提出更高要求。标准是检验和判定产品质量安全的关键指标,分析和评价是选用标准和实践标准的重要手段。本文以技术标准体系中两个重要方面——产品标准和方法标准为例,从指标限值量单位及溯源、指标... 详细信息

社会经济的高质量发展对产品质量安全提出更高要求。标准是检验和判定产品质量安全的关键指标,分析和评价是选用标准和实践标准的重要手段。本文以技术标准体系中两个重要方面——产品标准和方法标准为例,从指标限值量单位及溯源、指标涵盖面、检测过程和社会经济效益影响等方面进行探讨,研究比较这些因素对标准比较分析客观性的影响。建议在风险评估基础上科学、合理地开展分析和评价,为高效、准确和经济有效地选用技术标准提供参考。

关键词：标准分析标准评价风险评估风险-收益

Conjugation of Chitooligosaccharide-5-fluorouracil with Bovine Serum Albumin

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2006年第11期17卷 1495-1498页

作者： Rong Min WANG Jing feng song yu feng HE Juan Juan MAO Yan LI Key Laboratory of Polymer Materials of Gansu Province Institute of Polymer Northwest Normal University Lanzhou 730070

The interaction between chitooligosaccharide-5-fluorouracil （COS-5FU） and bovine serum albumin （BSA） was studied by fluorescence spectroscopy. It was found that an energy transfer between COS-5FU and BSA had been occurred. The binding constants were calculated, k298K=1.175×10^4 L·mol^-1. Based on the mechanism of energy transfer of dipole-dipole interaction between the donor and acceptor, the distance between BSA and COS-SFU was determined.

关键词： Chitooligosaccharide-5-fluorouracil BSA fluorescence spectroscopy.

在线全文

学校读者我要写书评

暂无评论

温度对变压器油太赫兹光谱的影响

科学技术与工程 2024年第24期24卷 10159-10164页

作者：张梦林邱方程何运华李寒煜宋玉锋胡发平任冠华云南电网有限责任公司电力科学研究院昆明650217 华北电力大学机械工程系保定071003 华北电力大学数理系保定071003

利用太赫兹对电力用油进行现场检测时,通常难以避免温度对结果的影响。为探究温度对检测结果的影响规律,利用自制控温装置在-30~40℃的范围内,对变压器油,0.01 mol/L的甲醇、甲酸、糠醛溶液进行太赫兹检测。结果表明:随温度的升高样品... 详细信息

利用太赫兹对电力用油进行现场检测时,通常难以避免温度对结果的影响。为探究温度对检测结果的影响规律,利用自制控温装置在-30~40℃的范围内,对变压器油,0.01 mol/L的甲醇、甲酸、糠醛溶液进行太赫兹检测。结果表明:随温度的升高样品时域谱的峰值逐渐减小,峰值的时间延迟也逐渐减小。对应样品吸收系数逐渐增大,折射率逐渐减小。分别对1.2 THz处和0.2~1.6 THz范围内的吸收系数谱、折射率谱进行平均。并利用多项式对平均数据进行曲线拟合。使用油纸比为20∶1的人工老化样品对拟合曲线进行验证,拟合曲线可对不同温度下的太赫兹检测结果进行温度补偿,为太赫兹的现场应用提供了参考。

关键词：太赫兹变压器油温度吸收系数折射率

Role of [18F] fludeoxyglucose positron emission tomography in the selection of liver transplantation candidates in patients with hepatocellular carcinoma

在线全文

学校读者我要写书评

暂无评论

Hepatobiliary & Pancreatic Diseases International 2017年第3期16卷 257-263页

作者： yu-Fu Ye Wei Wang Ting Wang Jun yu Lei Geng song-feng yu Sheng Yan Shu-Sen Zheng Division of Hepatobiliary and Pancreatic Surgery First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 China Key Laboratory of Combined Multi-organ Transplantation Ministry of Public Health Collaborative Innovation Center for Diagnosis Treatment of Infectious Diseases Hangzhou 310003 China

BACKGROUND： The Milan criteria are widely accepted among many centers. However, patients with hepatocellular carcinoma beyond the Milan criteria might still benefit from liver transplantation （LT） when tumor itself is not aggressive. [18F] fluorodeoxyglucose positron emission tomography/computed tomography imaging could provide useful information of tumor behaviors, which is helpful to predict the prognosis for many tumors. METHOD： In order to determine its role in candidate selection for LT, we therefore retrospectively analyzed 103 recipients with preoperative positron emission tomography （PET） findings. RESULTS： Positive PET findings （PET＋） were significantly associated with tumor nodule numbers （P=0.013）, tumor grade （P=0.025）, macro- （P=0.002） and micro-vascular invasion （P=0.002）, as well as the Milan criteria （P=0.018）. PET＋ patients had significantly increased risk of tumor recurrence post-LT compared to PET negative （PET-） patients （P=0.007）. The 1-, 3-, and 5-year overall survival rate of PET- patients were 96.0%, 87.2% and 76.2%, compared to 74.7%, 55.4% and 49.9% in PET＋ patients, respectively （P〈0.05）. The 1-, 3-, and 5-year recurrence-free survival rate of PET- patients were 91.8%,81.9% and 76.0%, compared to 70.1%, 39.3% and 21.9% in PET＋ patients, respectively （P〈0.05）. Recipients within the Milan criteria showed comparable 1-, 3-, and 5-year survival rates in comparison with those beyond the Milan criteria with a PET- findings （1-, 3-, and 5-year overall survival rates, 97.5%, 83.3%, and 83.3% vs 90.0%, 80.0%, and 66.7%, P= 0.123; 1-, 3-, and 5-year recurrence-free survival rates, 95.1%, 73.1%, and 73.1% vs 90.0%, 78.8%, and 65.6%, P=0.148）. CONCLUSIONS： Certain patients with hepatocellular carcinoma and negative PET findings, who have exceeded the Milan criteria, are also eligible candidates for LT. Preoperative PET/CT imaging is an important marker, which should be incorporated in extended candidate selection criteria for LT.

关键词： liver transplantation hepatocellular carcinoma positron emission tomography/computed tomography ,prognostic factors

在线全文

学校读者我要写书评

暂无评论

黄鳝来源阿氏芽孢杆菌的筛选及发酵条件优化

饲料研究 2024年第3期47卷 73-78页

作者：郑菲菲何鑫尹丽张靖悦祝东梅高坚宋玉峰赵玉华华中农业大学水产学院湖北武汉430070 水产养殖国家级实验教学示范中心(华中农业大学) 湖北武汉430070

试验旨在从人工养殖的黄鳝体内分离高产蛋白酶菌株,为后续微生物蛋白酶的制备和微生态制剂的开发提供菌种资源,以解决黄鳝摄食率低、消化不完全及水体氮污染等问题。通过采用脱脂奶粉培养基透明圈法初筛和Folin-酚法测定酶活复筛相结合... 详细信息

试验旨在从人工养殖的黄鳝体内分离高产蛋白酶菌株,为后续微生物蛋白酶的制备和微生态制剂的开发提供菌种资源,以解决黄鳝摄食率低、消化不完全及水体氮污染等问题。通过采用脱脂奶粉培养基透明圈法初筛和Folin-酚法测定酶活复筛相结合的方式筛选人工养殖黄鳝肠道中的高产蛋白酶菌株,通过溶血试验与药敏试验检测菌株安全性,并进行常规生化和分子生物学鉴定。通过单因素和正交试验优化其发酵条件,筛选到一株高产蛋白酶、产过氧化氢酶的菌株Ma-4,初步鉴定其为阿氏芽孢杆菌(Bacillus aryabhattai)。该菌株最适产酶条件为发酵时间48 h、发酵温度36℃、可溶性淀粉添加量15 g/L、牛肉浸粉添加量15 g/L和pH值6.0。优化后菌株酶活力为288.14 U/mL,较优化前提高了3.34倍。研究表明,菌株Ma-4为高产蛋白酶、产过氧化氢酶、不溶血、不耐药的阿氏芽孢杆菌,该菌株为开发黄鳝微生态制剂开拓了菌种资源。

关键词：黄鳝阿氏芽孢杆菌筛选鉴定安全性评价发酵条件优化