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1.
Algirdas Mikalkėnas Bazilė Ravoitytė Daiva Tauraitė Elena Servienė Rolandas Meškys 《Journal of enzyme inhibition and medicinal chemistry》2018,33(1):384-389
Small molecule inhibitors have a powerful blocking action on viral polymerases. The bioavailability of the inhibitor, nevertheless, often raise a significant selectivity constraint and may substantially limit the efficacy of therapy. Phosphonoacetic acid has long been known to possess a restricted potential to block DNA biosynthesis. In order to achieve a better affinity, this compound has been linked with natural nucleotide at different positions. The structural context of the resulted conjugates has been found to be crucial for the acquisition by DNA polymerases. We show that nucleobase-conjugated phosphonoacetic acid is being accepted, but this alters the processivity of DNA polymerases. The data presented here not only provide a mechanistic rationale for a switch in the mode of DNA synthesis, but also highlight the nucleobase-targeted nucleotide functionalization as a route for enhancing the specificity of small molecule inhibitors. 相似文献
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Floral meristems of Lolium and Festuca grasses give a 5- to 19-fold enhancement in yield of extracted DNA in comparison with leaves. Meristems also provide highly
pure DNA samples. The method could be useful for applications in molecular genetics in many species of the Gramineae.
Received: 14 April 1998 / Revision received: 8 June 1998 / Accepted: 10 July 1998 相似文献
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Multistep Photoluminescence Decay Reveals Dissociation of Geminate Charge Pairs in Organolead Trihalide Perovskites 下载免费PDF全文
Ramūnas Augulis Marius Franckevičius Vytautas Abramavičius Darius Abramavičius Shaik Mohammed Zakeeruddin Michael Grätzel Vidmantas Gulbinas 《Liver Transplantation》2017,7(17)
Charge carrier dynamics in organolead iodide perovskites is analyzed by employing time‐resolved photoluminescence spectroscopy with several ps time resolution. The measurements performed by varying photoexcitation intensity over five orders of magnitude enable separation of photoluminescence components related to geminate and nongeminate charge carrier recombination and to address the dynamics of an isolated geminate electron–hole pair. Geminate recombination dominates at low excitation fluence and determines the initial photoluminescence decay. This decay component is remarkably independent of the material structure and experimental conditions. It is demonstrated that dependences of the geminate and nongeminate radiative recombination components on excitation intensity, repetition rate, and temperature, are hardly compatible with carrier trapping and exciton dissociation models. On the basis of semiclassical and quantum mechanical numerical calculation results, it is argued that the fast photoluminescence decay originates from gradual spatial separation of photogenerated weakly bound geminate charge pairs. 相似文献
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The effect of increasing doses of intravenously administered propranolol on electrophysiological features of heart was studied in 17 patients with untreated hyperthyroidism by using the transesophageal stimulation method. A positive and dose-dependent effect of propranolol on the studied parameters was found with the normalization of the majority of disturbances taking place after the administration of 6 mg of propranolol. This dose was safe and well tolerated by the patients. The sensitivity of the auriculo-ventricular junction to propranolol was less pronounced during the stimulated rhythm than during the sinus rhythm. 相似文献
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Neurochemical Research - The evolution of blood–brain barrier paralleled centralisation of the nervous system: emergence of neuronal masses required control over composition of the... 相似文献
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A combination of enclosure nutrient enrichment experiments and historical data analysis was used to identify the factors controlling
seasonal dynamics and competition of the phytoplankton community in the Curonian lagoon (Southeast Baltic Sea). Experiments
using different nutrient (N, P and Si) manipulations were performed in 10-l enclosures for 48 h. Changes in chlorophyll a concentrations, inorganic nutrient concentrations, and plankton cell density were monitored. Results revealed that phytoplankton
development in the lagoon is strongly affected by ambient physical factors (wind, temperature). Nutrient limitation, however,
also plays an important role in seasonal succession mechanisms showing quite distinct seasonal development patterns. Based
on the data, available phytoplankton seasonal succession in the Curonian lagoon could be described as composed by three phases
corresponding to different domination and regulatory mechanisms. 相似文献