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Frontmatter 头版头条
Pub Date : 2023-07-01 DOI: 10.1515/znc-2023-frontmatter7-8
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引用次数: 0
Frontmatter 头版头条
Pub Date : 2023-05-01 DOI: 10.1515/znc-2023-frontmatter5-6
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引用次数: 0
The search for commercial sweet white lupin (Lupinus albus L.) adaptive to Ethiopian growing condition seems not successful: what should be done? 寻找适合埃塞俄比亚生长条件的商业甜白罗苹(Lupinus albus L.)似乎不成功:应该做些什么?
Pub Date : 2023-05-01 DOI: 10.2139/ssrn.4196861
L. Yeheyis, Wondimeneh Mekonnen, M. Nelson, David Mcnaughton, Alemu Tarekegn, Zelalem Yadelew, H. Sanders
Abstract The study was conducted to find new adaptive commercial sweet white lupin (Lupinus albus L.) varieties and evaluate the effect of inoculum on herbage and seed yields of white and blue lupin varieties in Ethiopia for two growing seasons in two locations. For the experiment a factorial arrangement (seven variety * two inoculation) in a randomized complete block design with three replication was used. Three sweet blue (Bora, Sanabor and Vitabor), three sweet white (Dieta, Energy and Feodora) and one bitter white local landrace lupin varieties were tested in the experiment. Analysis of variance was done using the general linear model procedure in SAS. The effects of location and inoculum were insignificant (P ≥ 0.0761) on yield and yield parameters. The effect of variety was observed (P ≤ 0.035) only on plant height, fresh biomass yield and thousand seed weight in both seasons except for fresh biomass yield in season two. However, its effect on other parameters was not shown (P ≥ 0.134) in both growing seasons or only shown in either season. The mean dry matter yield of all varieties was 2.45 ton per ha. However, sweet blue entries performed better than white entries. The mean seed yield of blue sweet lupin entries and white local check was 2.6 ton per ha. Sweet blue and white local landrace varieties were found tolerant while, commercial sweet white lupin varieties were susceptible for anthracnose and fusarium diseases that occurred immediately after flowering. As a result imported commercial sweet white varieties failed to give seed yield. Developing adaptive, disease resistant and high yielding sweet white lupin through crossing the local and commercial varieties and looking for species specific inoculum should be the future research agendas.
摘要本研究旨在寻找新的适应性商业甜白露苹(Lupinus albus L.)品种,并在埃塞俄比亚两个地点的两个生长季节评价接种量对甜白露苹和蓝露苹品种牧草和种子产量的影响。试验采用随机完全区组设计,采用7个品种* 2个接种,3个重复。以3个甜蓝品种(Bora、Sanabor和Vitabor)、3个甜白品种(Dieta、Energy和Feodora)和1个苦白品种为试验对象。方差分析采用SAS通用线性模型程序进行。地点和接种量对产量和产量参数的影响不显著(P≥0.0761)。除了第二季的鲜生物量外,品种对两季的株高、鲜生物量和千粒重均有显著影响(P≤0.035)。其对其他参数的影响在两个生长期均不显著(P≥0.134)或仅在两个生长期均显著(P≥0.134)。各品种平均干物质产量为2.45吨/公顷。然而,甜美的蓝色条目比白色条目表现得更好。蓝甘露和白地方对照的平均种子产量为每公顷2.6吨。甜蓝和甜白地方品种被发现具有耐受性,而商品甜白罗苹品种对开花后立即发生的炭疽病和镰刀菌病敏感。因此,进口的商业甜白品种的种子产量不高。通过杂交本地品种和商业品种开发适应性强、抗病高产的甜白骆马,并寻找品种专用接种剂应是今后研究的重点。
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引用次数: 1
Frontmatter 头版头条
Pub Date : 2023-03-01 DOI: 10.1515/znc-2023-frontmatter3-4
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引用次数: 0
Comparative study of phenolic profile, antioxidant and antimicrobial activities of aqueous extract of white and green tea 白茶和绿茶水提物酚类成分、抗氧化和抗菌活性的比较研究
Pub Date : 2022-05-23 DOI: 10.1515/znc-2021-0321
Gamal A. Gabr, H. Hassan, V. Seshadri, N. Hassan
Abstract The sole difference between white tea (WT) and green tea (GT) is the former that made only from the buds and young leaves of the Camelia sinensis plant, whilst the latter is made from matured tea leaves. The phytochemical profiles, phenolic compounds, antioxidant, and antimicrobial activity of two varieties of Camellia sinensis teas, white and green, were compared in this study. Total antioxidant capacity, reducing power, DPPH radical scavenging, and Fe+2 chelating activities were used to determine antioxidant activities in water extract of GT and WT. The largest level of phenolic content was discovered in WGTE compared with the lowest amount was found in WWTE (290.67 mg/100 g tea and 185.96 mg/100 g tea, respectively). Phenoilc acids (gallic, benzoic, chlorogenic, ellagic, and ρ-coumaric acids) and flavonoids (rutin and kampherol) were found in the two extracts. The findings of DPPH radical scavenging assays were 84.06 and 82.37% inhibition. In vitro antimicrobial activity was indicated that (WWTE and WGTE) had a high level of activity against Staphylococcus aureus, and gave negative activity against Salmonella typhimurium, and Aspergillus Niger. The WT and GT extracts are a great source of natural antioxidants with biological effects on human health.
白茶(WT)和绿茶(GT)之间的唯一区别是前者仅由茶树植物的芽和幼叶制成,而后者由成熟的茶叶制成。对两种茶树品种白茶树和绿茶树的植物化学特征、酚类化合物、抗氧化和抗菌活性进行了比较。以总抗氧化能力、还原能力、DPPH自由基清除能力和Fe+2螯合活性为指标,测定了水提物和水提物的抗氧化活性。水提物中酚含量最高,水提物中酚含量最低,分别为290.67 mg/100 g茶和185.96 mg/100 g茶。两种提取物中均含有酚酸(没食子酸、苯甲酸、绿原酸、鞣花酸和ρ香豆酸)和类黄酮(芦丁和苦参酚)。DPPH自由基清除率分别为84.06和82.37%。体外抑菌活性表明,(WWTE和WGTE)对金黄色葡萄球菌具有较高的抑菌活性,对鼠伤寒沙门菌和黑曲霉的抑菌活性为阴性。WT和GT提取物是天然抗氧化剂的重要来源,对人体健康具有生物效应。
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引用次数: 1
Synthesis, characterization, molecular docking, dynamics simulations, and in silico absorption, distribution, metabolism, and excretion (ADME) studies of new thiazolylhydrazone derivatives as butyrylcholinesterase inhibitors 新型丁酰胆碱酯酶抑制剂噻唑酰腙衍生物的合成、表征、分子对接、动力学模拟及硅吸收、分布、代谢和排泄(ADME)研究
Pub Date : 2022-05-23 DOI: 10.1515/znc-2021-0316
A. Işık, U. A. Çevik, I. Celik, Tuğba Erçetin, A. Koçak, Y. Özkay, Z. Kaplancıklı
Abstract In this study, two novel series of thiazolylhydrazone derivatives containing 4-ethylpiperazine (3a–3f) and 4-methoxyphenylpiperazine (3g–3l) side chains were synthesized and their structures were characterized by spectral (1H NMR, 13C NMR, and MS spectra) analyses. In vitro inhibitory activities of synthesized compounds against acetylcholinesterase (AChE) and butyrylcholinesterase (BChE) were determined by Ellman method. According to the results, all compounds showed a weak inhibitory effect on AChE, while promising results were obtained on BChE. Among the synthesized compounds, the activities of the derivatives carrying 4-ethylpiperazine (3a–3f) structure were found to be more effective than the compounds carrying 4-methoxyphenyl piperazine (3g–3l) derivatives. Especially, compound 3f bearing the nitro substituent was found to be the most promising compound on BChE in the series. The absorption, distribution, metabolism, and excretion (ADME) parameters of the synthesized compounds were predicted by using the SwissADME server. The potential binding mode and stability of compound 3f with BChE were investigated by the molecular docking and dynamics simulations. The results showed that 3f was strongly bound up with BChE with the optimal conformation; in addition, their binding free energy reached −167.936 ± 13.109 kJ/mol.
摘要本研究合成了两个新的含4-乙基哌嗪(3a-3f)和4-甲氧基苯基哌嗪(3g-3l)侧链的噻唑基腙衍生物,并通过波谱(1H NMR, 13C NMR和MS)分析对其结构进行了表征。采用Ellman法测定合成化合物对乙酰胆碱酯酶(AChE)和丁基胆碱酯酶(BChE)的体外抑制活性。结果表明,所有化合物对AChE均有较弱的抑制作用,而对BChE则有较好的抑制效果。在所合成的化合物中,携带4-乙基哌嗪(3a-3f)结构的衍生物的活性比携带4-甲氧基苯基哌嗪(3g-3l)衍生物的化合物更有效。特别是含硝基取代基的化合物3f是该系列化合物中最有前途的化合物。利用SwissADME服务器预测合成化合物的吸收、分布、代谢和排泄(ADME)参数。通过分子对接和动力学模拟研究了化合物3f与BChE的潜在结合方式和稳定性。结果表明,3f与BChE结合较强,构象最佳;它们的结合自由能达到−167.936±13.109 kJ/mol。
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引用次数: 6
Frontmatter
Pub Date : 2022-05-01 DOI: 10.1515/znc-2022-frontmatter5-6
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引用次数: 0
Synthesis, antimicrobial activity and modeling studies of thiazoles bearing pyridyl and triazolyl scaffolds 吡啶基和三唑基噻唑类支架的合成、抗菌活性及模拟研究
Pub Date : 2022-04-27 DOI: 10.1515/znc-2022-0002
Naime Funda Tay, B. Berk, M. Duran, I. Kayağil, L. Yurttaş, Sevde Nur Biltekin Kaleli, M. Yamaç, A. Karaduman, Ş. Demirayak
Abstract In this study, novel 4-(5-((2/3/4-substituted benzyl)thio)-4-(4-substituted phenyl)-4H-1,2,4-triazol-3-yl)-2-(pyridin-3/4-yl)thiazoles were synthesized following a multi-step synthetic procedure. All the compounds were screened with a panel of gram positive/negative bacteria, yeasts, and molds for antimicrobial activity using the disc diffusion method. Then, the minimum inhibitor concentration (MIC) and the minimum bactericidal concentration (MBC) values of active compounds were determined against Micrococcus luteus, Bacillus cereus, Listeria monocytogenes, and Staphylococcus aureus using the broth microdilution technique. These compounds were also screened for their inhibitory activities against S. aureus DNA gyrase by supercoiling assay. Furthermore, the crystal structure of S. aureus DNA gyrase B ATPase was subjected to a docking experiment to identify the possible interactions between the most active ligand and the active site. Lastly, the in silico technique was performed to analyze and predict the drug-likeness, molecular and ADME properties of the synthesized molecules.
摘要本研究采用多步合成方法合成了新型4-(5-(2/3/4-取代苄基)硫代)-4-(4-取代苯基)- 4h -1,2,4-三唑-3-基)-2-(吡啶-3/4-基)噻唑。所有化合物用革兰氏阳性/阴性菌、酵母菌和霉菌用圆盘扩散法进行抗菌活性筛选。然后采用肉汤微量稀释法测定活性化合物对黄体微球菌、蜡样芽孢杆菌、单核增生李斯特菌和金黄色葡萄球菌的最小抑制浓度(MIC)和最小杀菌浓度(MBC)值。并通过超螺旋实验筛选了这些化合物对金黄色葡萄球菌DNA旋切酶的抑制活性。此外,对金黄色葡萄球菌DNA旋切酶B atp酶的晶体结构进行对接实验,以确定最活跃的配体与活性位点之间可能的相互作用。最后,利用计算机技术对合成分子的药物相似性、分子性质和ADME性质进行了分析和预测。
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引用次数: 2
Utilizing response surface methodology to evaluate the process parameters of indigenous cucumber fermentation 利用响应面法评价乡土黄瓜发酵工艺参数
Pub Date : 2022-04-25 DOI: 10.1515/znc-2022-0009
H. Gül, M. Güngörmüşler
Abstract Commercial pickled cucumbers are produced in variety of salt concentrations including brines up to 15% sodium chloride due to the preventive nature of the salt towards microbial growth. Although it is deemed necessary for manufacturers to utilize high amounts of salts to prolong shelf life, the high content creates a burden for the growth of beneficial microorganisms including probiotics. In this study, the production of naturally fermented cucumbers and their microbial viability were tested with the help of an experimental design tool, Box-Behnken Design (BBD), to evaluate the optimal conditions for the production process and to maintain the highest viability of potential beneficial microorganisms during storage. Accordingly, the operational conditions including salt concentration (2, 5, or 8%), fermentation temperature (20, 25, or 30 °C), and brine filling (pretreatment) temperature (80, 85, or 90 °C) were optimized with a significant fit to a quadratic model (p < 0.05). The trends for sugar consumption and total acid production were monitored to demonstrate the correlation between the above-mentioned operational parameters for the fermentation process of pickled cucumbers with indigenous microorganisms. Overall, 5% salt content, 70 °C filling temperature and 25 °C fermentation medium was determined to maintain over 6 log cfu/mL viability. The results represent a valuable contribution to the pickle industry including a know-how of process parameters.
商业腌黄瓜是在各种盐浓度下生产的,包括高达15%氯化钠的盐水,因为盐对微生物生长有预防作用。尽管制造商认为有必要使用大量的盐来延长保质期,但高含量的盐对包括益生菌在内的有益微生物的生长造成了负担。本研究采用Box-Behnken design (BBD)实验设计工具,对自然发酵黄瓜的生产及其微生物活力进行了测试,以评估生产过程的最佳条件,并在储存过程中保持潜在有益微生物的最高活力。因此,优化了操作条件,包括盐浓度(2、5或8%)、发酵温度(20、25或30°C)和盐水填充(预处理)温度(80、85或90°C),并显著拟合到二次模型(p < 0.05)。通过对糖消耗量和总酸产量的变化趋势进行监测,验证了上述操作参数与本地微生物对酸黄瓜发酵过程的影响。总体而言,5%的盐含量,70°C的灌装温度和25°C的发酵培养基确定保持超过6 log cfu/mL的活力。结果代表了一个有价值的贡献,泡菜工业包括工艺参数的专有技术。
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引用次数: 0
In-silico elucidation reveals potential phytochemicals against angiotensin-converting enzyme 2 (ACE-2) receptor to fight coronavirus disease 2019 (COVID-19) 芯片解析揭示了对抗血管紧张素转换酶2 (ACE-2)受体的潜在植物化学物质,以对抗2019冠状病毒病(COVID-19)
Pub Date : 2022-04-25 DOI: 10.1515/znc-2021-0325
Hina Khalid, Sana Khalid, M. Sufyan, U. Ashfaq
Abstract The coronavirus (SARS-CoV-2) pandemic is rapidly advancing and spreading worldwide, which poses an urgent need to develop anti-SARS-CoV-2 agents. A human receptor, namely, angiotensin-converting enzyme 2 (ACE-2), supports the SARS-CoV-2 entry, therefore, serves as a target for intervention via drug. In the current study, bioinformatic approaches were employed to screen potent bioactive compounds that might be ACE-2 receptor inhibitors. The employment of a docking study using ACE receptor protein with a ready-to-dock database of phytochemicals via MOE software revealed five compounds as potent molecules. Among them, astragaloside exhibited the highest binding affinity −21.8 kcal/mol and stable interactions within the active site of the ACE-2 receptor. Similarly, the phytochemicals such as pterocaryanin B, isoastragaloside II, and astraisoflavan glucoside followed by oleuropein showed a stronger binding affinity. We hypothesize these compounds as potential lead candidates for the development of anti- COVID-19 target-specific drugs.
摘要新型冠状病毒(SARS-CoV-2)大流行在全球范围内快速推进和蔓延,迫切需要开发抗SARS-CoV-2药物。人类受体血管紧张素转换酶2 (ACE-2)支持SARS-CoV-2进入,因此可以作为药物干预的靶点。在目前的研究中,生物信息学方法被用于筛选可能是ACE-2受体抑制剂的有效生物活性化合物。通过MOE软件将ACE受体蛋白与植物化学物质数据库进行对接研究,发现五种化合物是有效分子。其中黄芪甲苷的结合亲和力最高,为21.8 kcal/mol,在ACE-2受体活性位点内相互作用稳定。同样,植物化学物质如紫花菜苷B、异黄芪甲苷II、黄芪黄素葡萄糖苷紧随橄榄苦苷之后,表现出更强的结合亲和力。我们假设这些化合物可能是开发抗COVID-19靶向特异性药物的潜在先导候选物。
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引用次数: 1
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Zeitschrift für Naturforschung C
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