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Centrifuge 5424

5424/5424 R 离心机

Company: Eppendorf
Catalog#: 5424
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Assessment of Caenorhabditis elegans Competitive Fitness in the Presence of a Bacterial Parasite
Author:
Date:
2018-08-20
[Abstract]  Accurate measurements of an organism’s fitness are crucial for measuring evolutionary change. Methods of fitness measurement are most accurate when incorporating an individual’s survival and fecundity, as well as accounting for any ecological interactions or environmental effects experienced by the organism. Here, we describe a protocol for measuring the relative mean fitness of Caenorhabditis elegans populations, or strains, through an assay that accounts for individual survival, fecundity, and intraspecific competitive ability in the presence of a bacterial parasite. In this competitive fitness assay nematodes from a focal population or strain are mixed with a GFP-marked tester strain in equal proportions, the mixture of nematodes are then exposed to a parasite, and the ... [摘要]  准确测量生物体的适应度对于衡量进化变化至关重要。当结合个体的生存和繁殖力以及考虑生物体所经历的任何生态相互作用或环境影响时,适合度测量的方法是最准确的。在这里,我们描述了一种用于测量秀丽隐杆线虫种群或菌株的相对平均适合度的方案,该方案通过在细菌寄生虫存在下计算个体存活率,繁殖力和种内竞争能力的测定。在这种竞争性适应性测定中,来自焦点种群或菌株的线虫与GFP标记的测试菌株以相等比例混合,然后将线虫的混合物暴露于寄生虫,并且通过测量来确定焦点菌株的相对竞争适合度。一代后,焦点线虫与GFP标记的线虫的比例发生变化。具体地,可以实施该协议以通过确定进化线虫与祖先线虫群体的相对竞争适合度来测量实验进化后线虫宿主适应度的变化。

【背景】 准确测量适应度和适应度随时间的变化对于确定群体对自然选择的反应至关重要。尽管如此,健康是众所周知难以衡量的,因为它包含了个人的生存,繁殖力,繁殖时间,并且必须考虑到对个体的生态和环境影响。尽管在所有可能的条件下没有用于测量适合度的协议是最佳的,但是考虑到生存和繁殖力的适应度的测量,同时保持生态和环境影响不变,可能提供对给定场景的适合性的可靠总体估计。在这里,我们描述了一个用于测量 C之间相对适应度差异的协议。线虫种群或菌株,用于确定细菌寄生虫存在时进化时间内相对适合度的变化。我们利用革兰氏阴性细菌粘质沙雷氏菌作为 ...

Two Different Methods of Quantification of Oxidized Nicotinamide Adenine Dinucleotide (NAD+) and Reduced Nicotinamide Adenine Dinucleotide (NADH) Intracellular Levels: Enzymatic Coupled Cycling Assay and Ultra-performance Liquid Chromatography (UPLC)-Mass Spectrometry
Author:
Date:
2018-07-20
[Abstract]  Current studies on the age-related development of metabolic dysfunction and frailty are each day in more evidence. It is known, as aging progresses, nicotinamide adenine dinucleotide (NAD+) levels decrease in an expected physiological process. Recent studies have shown that a reduction in NAD+ is a key factor for the development of age-associated metabolic decline. Increased NAD+ levels in vivo results in activation of pro-longevity and health span-related factors. Also, it improves several physiological and metabolic parameters of aging, including muscle function, exercise capacity, glucose tolerance, and cardiac function in mouse models of natural and accelerated aging.

Given the importance of monitoring cellular NAD+ and ...
[摘要]  目前关于代谢功能障碍和虚弱的年龄相关发展的研究每天都有更多的证据。众所周知,随着衰老的进展,烟酰胺腺嘌呤二核苷酸(NAD + )水平在预期的生理过程中降低。最近的研究表明,NAD + 的减少是与年龄相关的代谢衰退发展的关键因素。增加NAD + 水平体内导致激活寿命和健康跨度相关因素。此外,它改善了老化的几个生理和代谢参数,包括自然和加速老化的小鼠模型中的肌肉功能,运动能力,葡萄糖耐量和心脏功能。

鉴于监测细胞NAD + 和NADH水平的重要性,有一个值得信赖的方法是至关重要的。该方案的目的是在有效且广泛适用的测定中描述来自组织和细胞的NAD + 和NADH提取以及其图形和定量分析。

【背景】氧化烟酰胺腺嘌呤二核苷酸和还原型烟酰胺腺嘌呤二核苷酸(NAD + 和NADH)是重要的生物辅助因子,它们在几种合成代谢和分解代谢功能中提供和接受电子。它们参与诸如糖酵解,三羧酸循环和氧化磷酸化的反应。此外,它还作为DNA损伤修复中涉及的几种酶的底物,例如sirtuins和poly(ADP-核糖)聚合酶(PARP)(Imai和Guarente,2014; Verdin,2015; Yoshino et al。 ,2018)。

NAD + ...

Measuring CD38 Hydrolase and Cyclase Activities: 1,N6-Ethenonicotinamide Adenine Dinucleotide (ε-NAD) and Nicotinamide Guanine Dinucleotide (NGD) Fluorescence-based Methods
Author:
Date:
2018-07-20
[Abstract]  CD38 is a multifunctional enzyme involved in calcium signaling and Nicotinamide Adenine Dinucleotide (NAD+) metabolism. Through its major activity, the hydrolysis of NAD+, CD38 helps maintain the appropriate levels of this molecule for all NAD+-dependent metabolic processes to occur. Due to current advances and studies relating NAD+ decline and the development of multiple age-related conditions and diseases, CD38 gained importance in both basic science and clinical settings. The discovery and development of strategies to modulate its function and, possibly, treat diseases and improve health span put CD38 under the spotlights. Therefore, a consistent and reliable method to measure its activity and explore its use in medicine is required. We ... [摘要]  CD38是参与钙信号传导和烟酰胺腺嘌呤二核苷酸(NAD + )代谢的多功能酶。通过其主要活性,NAD + 的水解,CD38有助于维持该分子的适当水平,从而发生所有NAD + 依赖性代谢过程。由于目前有关NAD + 下降和多种年龄相关疾病和疾病发展的研究和进展,CD38在基础科学和临床环境中都具有重要意义。调整其功能,可能治疗疾病和改善健康状况的战略的发现和发展使CD38成为焦点。因此,需要一种一致且可靠的方法来测量其活性并探索其在医学中的用途。我们在这里描述了我们的小组如何测量CD38的水解酶和环化酶活性的方法,利用基于荧光的酶测定法在平板阅读器中使用1,N 6 -Ethenonicotinamide Adenine Dinucleotide(ε-NAD)进行)和烟酰胺鸟嘌呤二核苷酸(NGD)分别作为底物。

【背景】目前关于代谢功能障碍和虚弱的年龄相关发展的研究每天都有更多的证据。众所周知,随着老化的进行,NAD + 水平在预期过程中降低。最近的研究表明,烟酰胺腺嘌呤二核苷酸(NAD + )的减少与年龄相关的代谢下降有关(Massudi et al。,2012)。增加NAD + 水平体内,导致延长寿命和健康跨度相关因素的活化,并改善衰老的几个生理和代谢参数(Camacho-Pereira ...

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