搜索结果: 46-60 共查到“知识库 生物物理学”相关记录877条 . 查询时间(7.406 秒)
山羊脊柱融合生物力学体内模型的研究进展
直肠癌 山羊 脊柱融合 生物力学体内模型
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2018/9/21
伴随着人类生活习惯的改变,脊柱相关疾病发病率逐年增高,而对于病情严重患者的治疗大多采用融合手术。但对脊柱融合相关植骨材料、生物制剂、内固定器械以及脊柱融合术式改良等对患者带来的潜在影响尚不明确,因此脊柱融合生物力学体内模型在脊柱外科研究领域的应用越来越广。目前山羊脊柱融合生物力学体内模型因其脊柱解剖结构及生物力学属性均与人类相近,可以有效模拟人体脊柱受到融合手术干预下的生理病理过程以及最终结果,因...
毛乌素沙地南缘人工植被区生物结皮发育特征
生物结皮 人工植被 毛乌素沙地 环境因子
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2018/4/18
防沙治沙和生态修复工程实施之后,有植物定植的沙丘表面广泛发育了生物结皮。揭示不同类型人工植被与生物结皮发育特征之间的关系对受损荒漠系统的生态修复具有重要的参考价值。采用野外调查的方法,对毛乌素沙地南缘沙区不同类型人工植被区(羊柴Hedysarum mongdicum、小叶杨Populus simonii、沙柳Salix psammophila+羊柴、紫穗槐Amorpha fruticosa和沙地柏...
介绍一种可用于计算生物力学的离散梯度方法,此方法可利用离散的点云模型直接进行数值模拟分析而不需要传统的几何模型。将离散梯度法应用于点云模型需要首先确定模型中点之间的相邻关系和每个点所分配的材料体积,然后通过用广义的有限差分的形式定义了梯度插值向量,并以此向量来近似函数在每个离散点上的梯度。从弱形式出发,推导建立了适用于弹性固体大变形问题的求解器,并具有和有限元法中双线性四边形单元一致的准确性和收敛...
Modeling the dose effects of soybean oil in salad dressing on carotenoid and fat-soluble vitamin bioavailability in salad vegetables
bioavailability carotenoid concordance lipid triglyceride vitamin A vitamin E vitamin K
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2018/11/16
Background: Previously, we showed that vegetable oil is necessary for carotenoid absorption from salad vegetables. Research is needed to better define the dose effect and its interindividual variation...
目的:明确掌、背侧深层桡尺韧带对桡尺远侧关节的稳定作用。方法: 将14具新鲜冰冻上肢标本随机分为2组,解剖显露桡尺远侧韧带,分别标记掌、背侧深层韧带,解剖游离出旋前圆肌及旋后肌,在桡骨Lister结节处垂直骨面置一枚克氏针,前臂中立位时在尺骨远端同一水平位置平行置一枚克氏针作为标记点,用自制的夹具将标本固定于生物力学仪器上,使肘关节屈曲90°,固定尺骨,使桡骨可围绕尺骨自由旋转。
Potential of some bacteria for biological control of postharvest citrus green mould caused by Penicillium digitatum
Bacillus spp. biocontrol citrus green mould postharvest disease Agrobacterium radiobacter
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2017/6/26
Ten bacteria isolate (4 Bacillus subtilis, 2 Bacillus pumilus, 2 Bacillus cereus, 1 Bacillus megaterium, and 1 Agrobacterium radiobacter) were tested in vitro for antagonistic properties against Penic...
丹参酮合成相关的候选基因CYP76AK5克隆及生物信息学分析
丹参 丹参酮 生物合成 SmCYP76AK5 差异表达
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2017/12/5
基于丹参基因组和转录组筛选、克隆及分析丹参酮合成途径候选的CYP450编码基因。方法:设计引物克隆SmCYP76AK5编码基因,通过MEGA软件构建系统进化树并结合实时定量PCR分析其在根不同组织(周皮、韧皮部、木质部)、根、茎、叶、花中的差异表达;最后利用在线生物信息学工具分析其理化性质,预测其二级结构、保守结构域等。结果:系统进化树分析表明SmCYP76AK5属于CYP71clan;基因差异表...
Using the Loess Method to Describe the Effect of Temperature on Development Rate
non-parametric model local regression weighted least squares Aphididae
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2018/3/5
Temperature has a significant influence on development rates of insects and mites. Many parametric models were
built to describe the temperature-dependent development rates. However, these models pro...
根据仿生微小非光滑表面具有减黏降阻特性的特点,对NACA 2412翼型进行仿生改造,提出2种仿生机翼,即分别在机翼的上下表面布置相同数目、相同尺寸的非光滑矩形状条纹结构。基于Fluent软件,应用雷诺平均法分析原机翼模型和改造后2种仿生非光滑机翼模型在不同攻角下的气动性能。结果表明,在机翼下表面添加条纹结构改善机翼的气动性能,机翼上表面添加条纹结构破坏机翼的气动性能。
不同SAPO分子筛负载MnOx催化剂的低温NH3-SCR性能研究
磷酸硅铝分子筛 低温选择催化还原 锰物种 催化剂载体
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2016/11/1
以磷酸硅铝分子筛SAPO-5、SAPO-11和SAPO-34为载体,采用乙醇分散法制备了用于低温氨选择性还原(NH3-SCR)NOx的分子筛负载MnOx催化剂.活性测试结果显示,3种分子筛催化剂均展现出优良的NH3-SCR活性,但三者在低温区间的SCR活性存在较明显差异,其SCR活性顺序如下:MnOx/SAPO-34 > MnOx/SAPO-5 > MnOx/SAPO-11.借助XRD、N2吸附-...
采用阳极氧化法制备了TiO2纳米管(TiO2-NT),研究了阳极氧化时间对TiO2-NT形貌与结构的影响.结果表明,氧化时间为180 min时,TiO2-NT排列紧密,管口形状接近圆形,管径为93 nm左右.以TiO2-NT为底层采用电沉积法制备PbO2/TiO2-NT/Ti电极,PbO2/TiO2-NT/Ti电极与传统PbO2/SnO2-Sb2O3/Ti电极形貌、结构、电化学性能、使用寿命对比分...
Rapid Isolation of Bacterial Photosynthetic Reaction Centers with an Engineered Poly-Histidine Tag
photosynthetic reaction center poly-histidine tag isolation method (bacterium)
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2016/5/23
A very rapid method for isolating bacterial photosynthetic reaction centers (RCs) of high purity and yield is described. A poly-histidine tag is engineered at the C-terminus of the RC M-subunit, allow...
Electric Field-Induced Concentration Gradients in Planar Supported Bilayers
Biophysical Phenomena Biophysics Diffusion Electricity Fluorescent Dyes Lipid Bilayers Microscopy,Fluorescence Models,Chemical
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2016/5/23
A simple method of generating electric field-induced concentration gradients in planar supported bilayers has been developed. Gradients of charged, fluorescently labeled probes were visualized by epif...
Effects of Applied Electric Fields on the Quantum Yields of the Initial Electron-Transfer Steps in Bacterial Photosynthesis.1.Quantum Yield Failure
Applied Electric Fields Quantum Yields Initial Electron-Transfer Steps Bacterial Photosynthesis.1.Quantum
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2016/5/23
The effect of an applied electric field has been measured for the quantum yield of formation of the P[sup +]H[sup [minus]], P[sup +]Q[sub A][sup [minus]], and [sup 3]P states of nonoriented Rb. sphaer...