据Yang K 2023年6月2日[Science,2023,380(6648):942-948.]报道,美国研究人员设计出一种更好的方法来构建适配体。首先分析了有机化合物中的各个结构单元(官能团或片段)如何促进27对靶标-适配体对的结合。该分析对如何克服阻碍适配体接...据Yang K 2023年6月2日[Science,2023,380(6648):942-948.]报道,美国研究人员设计出一种更好的方法来构建适配体。首先分析了有机化合物中的各个结构单元(官能团或片段)如何促进27对靶标-适配体对的结合。该分析对如何克服阻碍适配体接触其目标的结构障碍产生了新的见解。适配体能够与特定靶受体结合的DNA或RNA短链,对于测量生物研究中的代谢物和蛋白、确定疾病标志物和治疗疾病来说,是非常有用的。它们在行为上很像抗体,但更容易合成和纳入生物传感器,在室温下更稳定,有更长的保质期,而且更不可能引发不必要的免疫反应。虽然适配体有无数种构型,但要准确找到适合某项特定任务的适配体是很困难的。研究人员通常通过筛选大量随机生成的DNA或RNA片段文库来识别适配体。对期望的靶标显示出亲和力的罕见的适配体可以通过进一步的研究加以改进,但也只是改进到一定程度。因此,适配体在生物医学中的应用有限。展开更多
A best evidence topic was devised in light of a structured protocol. What is the advantage of (minl"mally invasive) approach in (frail patients) undergoing (aortic valve replacement)? In cardiac outpatient cl...A best evidence topic was devised in light of a structured protocol. What is the advantage of (minl"mally invasive) approach in (frail patients) undergoing (aortic valve replacement)? In cardiac outpatient clinic you review an 85-year old male with severe aortic valve stenosis, low left ventricular ejection fraction and creatinine clearance of less than 50 mL/min. Other comorbidities include treated pulmonary hypertension, mild cognitive impairment, marked limitation of ordinary physical activity and depression. You resolve to determine whether to recommend mim'mally invasive or conventional aortic valve replacement (AVR) or transcathe- ter aortic valve implantation (TAVI), however you are not sure of the differences of the impact of frailty on preopera- tive risk for each approach; hence you investigate the best evidence on the topic.展开更多
文摘据Yang K 2023年6月2日[Science,2023,380(6648):942-948.]报道,美国研究人员设计出一种更好的方法来构建适配体。首先分析了有机化合物中的各个结构单元(官能团或片段)如何促进27对靶标-适配体对的结合。该分析对如何克服阻碍适配体接触其目标的结构障碍产生了新的见解。适配体能够与特定靶受体结合的DNA或RNA短链,对于测量生物研究中的代谢物和蛋白、确定疾病标志物和治疗疾病来说,是非常有用的。它们在行为上很像抗体,但更容易合成和纳入生物传感器,在室温下更稳定,有更长的保质期,而且更不可能引发不必要的免疫反应。虽然适配体有无数种构型,但要准确找到适合某项特定任务的适配体是很困难的。研究人员通常通过筛选大量随机生成的DNA或RNA片段文库来识别适配体。对期望的靶标显示出亲和力的罕见的适配体可以通过进一步的研究加以改进,但也只是改进到一定程度。因此,适配体在生物医学中的应用有限。
文摘A best evidence topic was devised in light of a structured protocol. What is the advantage of (minl"mally invasive) approach in (frail patients) undergoing (aortic valve replacement)? In cardiac outpatient clinic you review an 85-year old male with severe aortic valve stenosis, low left ventricular ejection fraction and creatinine clearance of less than 50 mL/min. Other comorbidities include treated pulmonary hypertension, mild cognitive impairment, marked limitation of ordinary physical activity and depression. You resolve to determine whether to recommend mim'mally invasive or conventional aortic valve replacement (AVR) or transcathe- ter aortic valve implantation (TAVI), however you are not sure of the differences of the impact of frailty on preopera- tive risk for each approach; hence you investigate the best evidence on the topic.