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41篇 您的检索式:作者名="Amponsah"
    题名 作者 年代 出处 被引量
1家禽卵泡闭锁机制的研究进展显示文摘家禽卵泡闭锁是一种受多种机制共同调控卵泡退化的过程,与家禽的繁殖性能密切相关。近年来,随着分子技术的快速发展,针对家禽卵泡细胞的凋亡和自噬引起卵泡闭锁的研究取得巨大进展。综述了家禽卵泡内细胞凋亡与自噬对家禽卵泡闭锁调控机制,讨论了卵泡细胞凋亡与自噬引起卵泡闭锁的意义及存在的问题。通过对家禽卵泡闭锁机制的研究,以期为家禽产蛋性能的充分利用和挖掘提供理论依据。邹坤 路丽丽 Collins Asiamah Amponsah 薛缘 张少伟 苏瑛 赵志辉 2020生物技术通报2020,36,4:10
2间充质干细胞修复大动物模型脊髓损伤疗效评价的Meta分析显示文摘目的:间充质干细胞移植作为具有发展前景的脊髓损伤治疗方法之一,目前大多集中于小动物模型相关研究,大动物实验开展较少,并且对干细胞的种类选择与治疗效果仍存在争议。文章通过Meta分析间充质干细胞对大动物模型脊髓损伤相关指标的影响,评价其对脊髓损伤修复的作用。方法:计算机检索PubMed、Cochrane、OVID、Web of Science和中国知网,检索时限从建库起至2019年12月,收集关于间充质干细胞治疗大动物脊髓损伤的系列研究。由2位研究者按照纳入标准独立完成文献筛选、资料提取及方法学质量评价,采用Stata16.0进行Meta分析。结果:最终10篇文献纳入研究,Meta分析结果显示:①间充质干细胞可显著改善脊髓损伤后运动功能[I2=97.73%,MD=3.94,95%CI(2.15,5.72),P<0.01],并根据细胞来源、观察时间、移植时机、移植方式和移植类型分不同进行亚组分析:骨髓间充质干细胞组、非骨髓间充质干细胞组、短时间观察组(<2个月)、长时间观察组(≥2个月)、急性期移植组、非急性期移植组、单纯细胞移植组、异种移植组的运动评分明显高于对照组(P<0.01);而支架复合移植组运动评分相较对照组,差异无显著性意义(P>0.05);②间充质干细胞治疗组的损伤面积明显小于对照组[I2=98.05%,MD=-1.00,95%CI(-1.95,-0.04),P=0.04];③间充质干细胞治疗组与对照组之间胶质纤维酸性蛋白相对表达量差异无显著性意义[I2=99.48%,MD=80.61,95%CI(-27.48,188.70),P=0.14]。结论:间充质干细胞移植治疗对大动物脊髓损伤的运动功能和损伤修复有明显改善作用,且安全性较高。受纳入文献质量的限制,以上结论需更高质量、更大样本的随机对照实验加以验证。孔德胜 何晶晶 冯宝峰 郭瑞云 Asiamah Ernest Amponsah 吕飞 张舒涵 张晓琳 马隽 崔慧先 2021中国组织工程研究2021,25,7:3
3Comparative evaluation of five height diameter models developed for black spruce and jack pine stand types in terms of goodness of lack of fit and predictive ability 显示文摘Newton P F Amponsah I G 2007For Ecol Management2007,247,:1
4Evaluation of Weibull-based parameter prediction equation systems for black spruce and jack pine stand types within the context of developing structural stand density management diagrams显示文摘Newton P F Amponsah I G 2005Can J For Res2005,35,:1
5Comparative evaluation of five height- diameter models developed for black spruce and jack pine standtypes in terms of goodness-of-fit, lack-of-fit and predictive ability 显示文摘Newton P F Amponsah I G 2007For Ecol Manage2007,247,:1
6Protection effect of the anthraquinones, cassiatorin and aurantio-obtusin from seeds of Senna tora against cowpea weevil attack显示文摘Objetive: To explore the potential insecticidal, ovipositor deterrent and antifeedant effects of ethyl acetate extract of the seeds of Senna tora(Syn. Cassia tora) against cowpea weevil(Callosobruchus maculatus).Method: The activities were evaluated using standard protocols.In these bioassays, the cowpea seeds were used directly as an insect feed. The activity of the extract and isolated compounds were tested at concentrations of 100, 200 and 300 μg/mL and compared to neem oil and cinnamaldehyde(as standard positive controls). Phytochemical analysis of the ethyl acetate extract was done through a number of chromatographic techniques and the structures of the isolated compounds were established through comprehensive spectroscopic analysis including 2 D-NMR and ESI-MS studies.Results: Fractionation of the active ethyl acetate extract resulted in the isolation of one known anthraquinone,aurantio-obtusin(1) and a novel compound that was named as cassiatorin(2). Compounds1 and 2 showed comparable insect antifeedant properties with the positive controls while their insecticidal and ovipositor deterrent effects were far superior to the standard controls.Conclusions: It is thus concluded that Senna tora extracts and the isolated compounds(1 and2) may be employed in the postharvest management of stored cowpea seeds and as other crop protectants.Valentine Chi Mbatchou Rita Akosua Dickson Isaac Kingsley Amponsah Abraham Yeboah Mensah Solomon Habtemariam 2018Asian Pacific Journal of Tropical Biomedicine2018,8,2:1
7Soil radon concentration along fault systems in parts of south eastern Ghana显示文摘Amponsah P Banoeng-Yakubo B Andam A 2008African earth science2008,51,:1
8Comparative evaluation of five height-diameter models developed forblack spruce and jack pine stand-types in terms goodness-of-fit, lack-of-fit and predictive ability显示文摘NEWTON P F AMPONSAH I G 2007Forest Ecology and Management2007,,247:1
9Sepsis: a landscape from the emergency department to the intensive care unie 显示文摘Rivers EP Nguyen HB Amponsah D 2003Crit care Med2003,31,3:1
10Adding new tools to theblack bag-introduction of ultrasound into the physical diagnosiscourse 显示文摘Afonso N Amponsah D Yang J 2010J Gen Intern Med2010,25,:1
11Identifi- cation , potential inoculum sources and pathogenicity of botryosphaeriaceous species associated with grapevine diebaek disease in New Zealand显示文摘Amponsah N T Jones E E Ridgway H J 2011Eur J Plant Pathol2011,,131:1
12Sepsis:A land scape from theemergency department to the intensive care unit显示文摘Rivjers EP Nguyen HB Amponsah D 2003Crit care Med2003,31,3:1
13Sepsis: a landscape from the emergency department to the intensive care unit显示文摘Rivers EP Nguyen HB Amponsah D 2003Crit Care Med2003,31,3:1
14Sepsis:A land scape from the emergency department to the intensive care unit显示文摘Rivers EP Nguyen HB Amponsah D 2003Crit care Med2003,31,3:1
15Gender differences in spatial abilities and spatial activity among university students in an egalitarian educational system 显示文摘Nordvik H Amponsah B 1998Sex Roles1998,38,1112:1
16Hepatitis b virus infection in post-vaccination south africa: occult HBV infection and circulating surface gene variants 显示文摘Amponsah DE Lebelo RL Rakgole JN 2015Journal of Clinical Virology2015,63,:1
17The electrochemical behaviour of TiO 2 nanotubes with Co 3 O 4 or NiO submicron particles: Composite anode materials for Li-ion micro batteries显示文摘Nana Amponsah Kyeremateng Chrystelle Lebouin Philippe Knauth Thierry Djenizian 2013Electrochimica Acta2013,,:1
18Soil radon concentration along fault systems in parts of south eastern Ghana显示文摘Paulina Amponsah Bruce Banoeng-Yakubo Aba Andam 2008Journal of African Earth Sciences2008,51,:1
19Sepsis: a landscape from the emergency department to the intensive care unit显示文摘RIVERS E P NGUYEN H B AMPONSAH D 2003Crit Care Med2003,31,3:1
20Soil radon concentration along fault systems in parts of south east- ern Ghana显示文摘AMPONSAH P BANOENG-YAKUBO B ANDAM A 2008Journal of African Earth Sciences2008,51,1:1
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