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Use of NMR relaxometry for determination of meat properties:a brief review

Food Materials Research 2022年第1期2卷 74-81页

作者： Muhammad Ammar Khan baila ahmad Asghar Ali Kamboh Zahida Qadeer Department of Food Science&Technology Faculty of Agriculture&EnvironmentThe Islamia University of BahawalpurBahawalpur 63100Pakistan Department of Veterinary Microbiology Faculty of Animal Husbandry&Veterinary SciencesSindh Agriculture UniversityTandojam 70060Pakistan

Nuclear magnetic resonance spectroscopy(NMR)is a non-destructive and rapid meat analytical *** meat has high proton content,the quality of fresh meat can be assessed by exciting proton spin using NMR laboratory *** allows the assessment of intrinsic properties including animal development stages and muscle type,as well as extrinsic factors including processing and storage conditions that affect the technological traits of *** can be used to determine the water-holding capacity of meat,water distribution in muscles,meat authentication,fat content,post mortem aging,rigor mortis,and changes in metabolomes,among *** in NMR relaxation times are associated with the changes in muscle components and their distribution as affected by various processing ***,industrial assessment is now demanding rapidity and real-time assessment,it is therefore essential to evaluate the potential of NMR in contrast to other ***,this review article presents the principle of working of NMR,various methods available,quality traits of meat that can be evaluated using this technique,and a brief *** review article will help the industry to adopt novel NMR-based meat quality assessment tools for rapid quality determinations.

关键词： technique NMR determination

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Knowledge and practices of primary care physicians on the current referral system of diabetic retinopathy in Islamabad and Rawal-Pindi, Pakistan

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International Journal of Ophthalmology(English edition) 2019年第12期12卷 1885-1892页

作者： Muhammad Shakaib Anwar baila Shakaib Waseem Akhtar Erum Yusufzai Maham Zehra Hajira Munawar Kinza Azhar Department of Ophthalmology Rawal Institute of Health and SciencesIslamabad 44000Pakistan Medical College Rawal Institute o f Health and SciencesIslamabad 44000Pakistan

AIM: To assess the current knowledge and practices in diabetic eye care and referral system regarding diabetic retinopathy(DR) in health centers of Islamabad and RawalPindi. METHODS: A cross-sectional study was carried out in 4 government and private health centers in RawalpindiIslamabad from May 2018 to Oct. 2018. A total of 38 Primary Care Physicians(general practitioners, family physicians, and internists) were recruited out of which data for 2 were either not returned, or were missing partially. Data were collected through a 27-item consented & validated, multiple-choice questionnaire based on physician characteristics, knowledge and practice of diabetic eye care and challenges faced due current DR referral system. Descriptive analyses for all variables were performed including, mean and standard deviation. Analytical analyses were also conducted to study association between different study variables. RESULTS: Mean scores of knowledge for general practitioners, family physicians, and internists were 41.7%, 42.0% and 46.6% respectively. A lack of knowledge, and suboptimal practices were observed regarding signs, symptoms, screening, testing, evaluation and referral of DR regardless of physicians’ specialty, or years in practice. Lack of expertise regarding direct ophthalmoscopy, interpretation of findings, and referral to an ophthalmologist were noted. Physicians who performed consultation and counselling according to patients’ needs referred more patients to an ophthalmologist than those who restricted their consultationto a fixed amount of time and had more patients per unit time(P=0.01). Physicians who had taken care of less than 5 number of patients with DR marked less incorrect answers with no significantly greater number or correct answers compared to physicians who had taken care of more than 5 number of patients with DR(P=0.044). An association of more than 5 patients with DR taken care of with more need based patient consultation and counselling was also

关键词： diabetic retinopathy referral of diabetic retinopathy diabetic retinopathy guidelines primary care physicians

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室内宽带多输入多输出抽头时延线新模型研究

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电波科学学报 2014年第6期29卷 1063-1069页

作者：赵雄文李艺伟 Balla Moussa Coulibaly 关利华刘盛尧华北电力大学电气与电子工程学院北京102206

根据室内无线电波传播规律和实测数据,研究建立了一个新的抽头时延线模型,该模型可以简单有效地估计视距和非视距路径下室内平均功率时延谱,并与实验结果一致.在广义平稳非相关散射信道前提下,通过分析抽头时延模型频率相关系数、抽头... 详细信息

根据室内无线电波传播规律和实测数据,研究建立了一个新的抽头时延线模型,该模型可以简单有效地估计视距和非视距路径下室内平均功率时延谱,并与实验结果一致.在广义平稳非相关散射信道前提下,通过分析抽头时延模型频率相关系数、抽头系数分布和相关性、抽头多普勒频谱等特性参数,给出了评估抽头时延线模型的新方法.文中建立的信道模型和参数,对于室内多输入多输出无线信道模拟仿真有较为重要的意义.

关键词：多输入多输出无线信道抽头时延线模型功率时延谱时延扩展多普勒谱

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粤北喀斯特地区不同年龄油茶林土壤细菌群落动态变化特征

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林业科学研究 2024年第4期37卷 95-107页

作者：郑全胜吴斌白拉曲珍叶飞王雨冯汉华广东省林业调查规划院广东广州510520 广州大学大湾区环境研究院珠江三角洲水质安全与保护教育部重点实验室广东广州510006

[目的]明确油茶种植年限对喀斯特地区土壤微生物群落的影响。[方法]以乐昌市富树山油茶种植基地分别种植了2、3和7年的油茶林土壤为研究对象,利用高通量测序技术和分子生态网络的分析方法对土壤细菌群落进行研究。[结果]油茶种植年限的... 详细信息

[目的]明确油茶种植年限对喀斯特地区土壤微生物群落的影响。[方法]以乐昌市富树山油茶种植基地分别种植了2、3和7年的油茶林土壤为研究对象,利用高通量测序技术和分子生态网络的分析方法对土壤细菌群落进行研究。[结果]油茶种植年限的增加会导致土壤中铵态氮和总氮的积累,虽然不会显著改变土壤中细菌群落的生物多样性,但会导致土壤细菌群落结构的改变。同时发现土壤水分是影响2、3年龄油茶林土壤细菌群落的关键环境因子,而种植7年油茶林的土壤细菌群落主要受pH的影响。此外,相比种植2~3年的油茶林,种植7年的油茶林土壤细菌类群之间的联系更为紧密,但同时出现了细菌网络模块化的缺失和关键物种的演变的现象。[结论]本研究揭示了粤北石漠化地区不同种植年限油茶纯林的土壤细菌群落动态变化特征,为维持油茶林土壤生态系统功能的实践管理提供了理论依据。

关键词：喀斯特地区油茶林细菌群落高通量测序网络分析

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