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Genotoxic and Cytotoxic Activities of Hippocratea africana Loes. Ex. Engl. Celastraceae Root Extract 非洲希波克拉底草的基因毒性和细胞毒性活性。心血管病。Celastraceae根提取物
Pub Date : 2023-09-21 DOI: 10.9734/ajbgmb/2023/v15i2331
None Johnny, I. I., None Okokon, J. E., None Ochigbo, E. B., None Udo, I. J., None Adefabi, A. M.
Hippocratea africana, a medicinal plant, used in ethnomedicine for the treatment of antimalarial, diabetes, poisoning and inflammatory diseases was investigated for cytotoxic and genotoxic effects on the root meristem cells of Allium cepa. The extract and fractions was also screened for total flavonoid and phenol content using standard methods. Onion bulbs were exposed to 2.5 mg/ml, 5mg/ml, and 10 mg/ml concentrations of the leaf extract for macroscopic and microscopic analysis. Tap water was used as a negative control and Methotrexate (0.1 mg/ml) as a positive control. There was statistically significant (P < 0.05) inhibition of root growth depending on concentration by the extract when compared with the negative control group. All the tested concentrations of the extract were observed to have cytotoxic effects on cell division in A. cepa. The extract- induced chromosomal aberrations and micronuclei (MNC) formations in A. cepa root tip cells and were significant (p<0.05) when compared with control group. The extract treatment further induced cell death, ghost cells, cells membrane damage, and binucleated cells. These results suggest that Hippocratea africana root extract possess cytotoxic and genotoxic effects on A. cepa which is as a results of its phytochemical constituents.
研究了药用植物非洲希波克拉底(Hippocratea africana)对大蒜根分生组织细胞的细胞毒性和基因毒性作用。非洲希波克拉底是一种民族医学中用于治疗疟疾、糖尿病、中毒和炎症疾病的植物。采用标准方法对提取液和馏分进行总黄酮和酚含量的筛选。洋葱鳞茎暴露于2.5 mg/ml、5mg/ml和10mg /ml浓度的叶提取物中进行宏观和微观分析。以自来水为阴性对照,以甲氨蝶呤(0.1 mg/ml)为阳性对照。差异有统计学意义(P <与阴性对照组相比,不同浓度提取物对根生长的抑制作用不同。所有实验浓度的提取物均观察到对A. cepa细胞分裂有细胞毒作用。与对照组相比,提取物诱导的A. cepa根尖细胞染色体畸变和微核形成显著(p < 0.05)。提取物进一步诱导细胞死亡、鬼影细胞、细胞膜损伤和双核细胞。这些结果表明,非洲希波克拉底根提取物具有细胞毒性和遗传毒性作用,这是其植物化学成分的结果。
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引用次数: 0
A Study of Phytochemical Analysis and Pharmacological Activities of Withania somnifera 苦荞麦的植物化学分析及药理活性研究
Pub Date : 2023-09-06 DOI: 10.9734/ajbgmb/2023/v15i2330
Nandini Premkumar
Ashwagandha roots (Withania somnifera L. Dunal) have a history of utilization in Ayurveda to address conditions such as fever, asthma, arthritis, rheumatism, inflammation, tuberculosis, mental disorders, and male sexual issues. Through phytochemical analyses, it has been determined that the plant predominantly contains alkaloids (such as withanine, sominiferine, tropine, isopelletierine, and anaferine) and steroidal lactones (including withanolides A-Y, withaferine A, withasominiferols A-C, withanone, and sitoindosides) as the active compounds. These constituents and extracts exhibit various pharmacological effects, encompassing antioxidant, antitumor, antimicrobial, antivenom, and anti-parkinsonian properties. This review provides an up-to-date overview of ashwagandha, focusing on its phytochemistry and pharmacology. The plant and numerous secondary metabolites have displayed efficacy in ameliorating diverse human ailments. Nonetheless, additional research is imperative to ascertain the precise mechanisms underlying their actions.
印度烟根(Withania somnifera L. Dunal)在阿育吠陀医学中被用来治疗发烧、哮喘、关节炎、风湿病、炎症、肺结核、精神障碍和男性性问题等疾病。通过植物化学分析,确定该植物主要含有生物碱(如:缬氨酸、半胱氨酸、托莨菪碱、异芥子碱和茴香碱)和甾体内酯(包括:缬内酯A- y、半胱氨酸A、半胱氨酸A- c、withanone和五角草苷)作为活性化合物。这些成分和提取物表现出各种药理作用,包括抗氧化、抗肿瘤、抗菌、抗蛇毒血清和抗帕金森病特性。本文综述了印度甘薯的最新研究概况,重点介绍了其植物化学和药理作用。植物和许多次生代谢物已显示出改善多种人类疾病的功效。尽管如此,还需要进一步的研究来确定其行为背后的确切机制。
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引用次数: 0
In-silico Investigation of Potential Inhibitors of 11-β-Hydroxysteroid Dehydrogenase 11-β-羟基类固醇脱氢酶潜在抑制剂的计算机研究
Pub Date : 2023-09-04 DOI: 10.9734/ajbgmb/2023/v15i2329
Abdullahi M. Hassan, Abdullahi H. Sadiya, Kuje E. Jafaru, H. Sunday
Diabetes mellitus is a chronic disease plagued with insufficient insulin production or insulin resistance. New targets and disease pathways are emerging and one such is the 11β-Hydroxysteroid dehydrogenase type 1 (11β-HSD1) which catalyses the intracellular conversion of inert cortisone to physiologically active cortisol, functioning to enhance local cortisol action beyond what would be predicted based on simple plasma exposures. This study aimed at exploring the anti-diabetic potential of the bioactive compounds found in Carica papaya.  In this study, 59 natural compounds were obtained from literature are used for molecular docking simulations against the 11β-HSD1 receptor target using the Python Prescription (PyRx) 0.8 software. An arbitrary docking score ≤ -8.0 kcal/mol was chosen as the cut-off value. Further screening for drug-likeness, Absorption Distribution Metabolism Excretion and Toxicity (ADMET) properties, Pan Assay Interference Compounds (PAINS), and bioactivity were performed. The compounds were compared to the 11β-HSD1 inhibitor, MK-0916 which was the reference compound and docked against the target with a binding affinity of -8.8 kcal/mol. After docking, 11 compounds emerged with docking of ≤-8.0 kcal/mol, the highest at -8.1 kcal/mol and lowest at -10.7 kcal/mol. The compounds were further screened using Ghose and Verber rule resulting in four compounds i.e. Ibogamine, Clausamine G, Dasycarpidan-1-methanol, acetate (ester) and Phenol-2-methyl-5- (1,2,2- trimethylcyclopentyl). Pharmacokinetic screening (ADMET and bioactivity) was carried out on the four compounds and it was discovered that they have a level of potency but Ibogamine has higher potency of exerting inhibitory function on 11β-HSD1 compared to the control.
糖尿病是一种因胰岛素分泌不足或胰岛素抵抗而引起的慢性疾病。新的靶点和疾病途径正在出现,其中之一是11β-羟基类固醇脱氢酶1型(11β-HSD1),它催化惰性可的松在细胞内转化为生理活性皮质醇,其功能是增强局部皮质醇的作用,超出了基于简单血浆暴露的预测。本研究旨在探讨番木瓜中所发现的生物活性化合物的抗糖尿病潜能。本研究利用Python Prescription (PyRx) 0.8软件对从文献中获得的59种天然化合物进行针对11β-HSD1受体靶点的分子对接模拟。选取≤-8.0 kcal/mol的任意对接评分作为临界值。进一步筛选药物相似性、吸收分布、代谢排泄和毒性(ADMET)特性、Pan Assay Interference Compounds (PAINS)和生物活性。将这些化合物与11β-HSD1抑制剂MK-0916进行比较,MK-0916作为对照化合物,与靶标对接,结合亲和力为-8.8 kcal/mol。对接后,有11个化合物的对接强度≤-8.0 kcal/mol,最高为-8.1 kcal/mol,最低为-10.7 kcal/mol。利用Ghose和Verber规则对化合物进行进一步筛选,得到Ibogamine、Clausamine G、Dasycarpidan-1-methanol、acetate(酯)和Phenol-2-methyl-5-(1,2,2-三甲基环戊基)4个化合物。对四种化合物进行了药代动力学筛选(ADMET和生物活性),发现它们都有一定的效价,但伊博加明对11β-HSD1的抑制作用比对照更强。
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引用次数: 0
Nondisjunction in Trisomy 21: Origin and Mechanisms 21三体的不分离:起源和机制
Pub Date : 2023-08-29 DOI: 10.9734/ajbgmb/2023/v15i2328
A. Razdan, R. Arora, Gauri Agarwal, Shikha Koul, Vandana Sharma, J. Kandpal
Down’s Syndrome is a chromosomal abnormality with a gain of a third copy of chromosome 21, characterized by craniofacial abnormalities, intellectual developmental delay and growth retardation. In the present study, one-day-old neonate and a patient with an aborted fetus were presented to rule out genetic aberrations via CMA screening. DNA was extracted using from the case samples and evaluated by CMA Affymetrix platform. Chromosomal abnormalities in the fetus such as trisomy emerges due to several factors including maternal age, genetic mutational events, non-disjunction of chromosomes and epigenetic changes. Genetic Cause of trisomy 21 is chromosomal aneuploidy and gain of three copies of chromosome 21. The Trisomy 21 can occur due to Robertsonian translocation, Mosaicisms or duplication of critical region of chromosome 21. The trisomy 21 is the result of nondisjunction of homologous chromosomes 21 during gametogenesis at the time of embryo development. CMA is an effective molecular diagnostic tool for predicting and diagnosing chromosomal abnormalities which needs to be promoted in India for healthy pregnancy outcomes. We report two cases of confirmed post-natal Trisomy 21. The main aim of this study is to focus on genetic diagnosis and its awareness which is still lacking with 100% coverage, in developing countries to reduce the burden of genetic diseases and associated emotional and economic consequences.
唐氏综合症是一种染色体异常,21号染色体获得第三个拷贝,以颅面异常、智力发育迟缓和生长迟缓为特征。在本研究中,一天大的新生儿和流产胎儿的患者被提出,以排除遗传畸变通过CMA筛选。从病例样本中提取DNA,并通过CMA Affymetrix平台进行评估。胎儿染色体异常,如三体,是由母亲年龄、基因突变事件、染色体不分离和表观遗传改变等因素引起的。21三体的遗传原因是染色体非整倍体和获得3个21染色体拷贝。21三体可由21号染色体关键区域的罗伯逊易位、镶嵌现象或重复引起。21三体是在胚胎发育时配子体发生时同源染色体21不分离的结果。CMA是预测和诊断染色体异常的有效分子诊断工具,需要在印度推广,以获得健康的妊娠结果。我们报告两例确诊的产后21三体。这项研究的主要目的是将重点放在发展中国家仍然缺乏100%覆盖率的遗传诊断及其认识上,以减轻遗传疾病的负担以及相关的情感和经济后果。
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引用次数: 0
Directly and Indirectly Determinable Rate Constants in Michaelian Enzyme-Catalyzed Reactions 米夏埃尔酶催化反应中可直接和间接确定的速率常数
Pub Date : 2023-08-28 DOI: 10.9734/ajbgmb/2023/v15i1327
Ikechukwu Iloh Udema
Backed by kinetic schemes, attempts have been made to derive equations for the calculation of all zero-order first-order rate constants (ZOFORC) for the activation of the enzyme-substrate (ES) complex and its deactivation. The values of ZOFORC, including the kind for the dissociation of the enzyme-product complex (EP) to free enzyme (E) and product (P), are hardly reported. The methods of research were primarily Bernfeld and Lineweaver methods. The goal of the research was to determine ways for the utilization of experimental data for the determination of verifiable and quantifiable rate constants, with the following objectives: 1) To derive equations for the first-order rate constants for the activation of ES and its deactivation, respectively; 2) To quantify by calculation the first-order rate constant for product release; 3) To ultimately quantify the rate constants; and 4) To advise the reactor, process, chemical engineers, etc. in different industrial concerns on the usefulness of the rate constants. The value of ZOFORC for the dissociation of EP to free E and P is 3.155 exp. (+5)/min; the values of the rate constant for activation and deactivation are 3.513 exp. (+4) and 2.377 exp. (+8)/min, respectively. Ultimately, it is imperative for all stakeholder groups to devise means of controlling the enzymatic rate of catalysis by manipulating the magnitudes of the rate constant for activation and deactivation in particular. The derived equations can be fitted to the experimentally generated and calculated data. A future research project should entail conducting the assay under optimum conditions so as to verify possible variations in the ZOFORC values when compared with values generated outside optimum conditions.
在动力学方案的支持下,已经尝试推导出计算酶-底物(ES)复合物活化及其失活的所有零阶一阶速率常数(ZOFORC)的方程。ZOFORC的值,包括酶-产物复合物(EP)解离为游离酶(E)和产物(P)的值,几乎没有报道。研究方法主要是Bernfeld法和Lineweaver法。本研究的目的是确定利用实验数据确定可验证和可量化的速率常数的方法,其目标如下:1)分别推导ES激活和ES失活的一阶速率常数方程;2)通过计算来量化产品释放的一阶速率常数;3)最终量化速率常数;4)就速率常数的实用性向不同工业领域的反应器、工艺、化学工程师等提供建议。EP解离为游离E和P的ZOFORC值为3.155 exp. (+5)/min;激活和失活的速率常数分别为3.513 exp.(+4)和2.377 exp. (+8)/min。最终,所有利益相关者团体都必须设计出通过操纵激活和失活的速率常数的大小来控制酶催化速率的方法。推导出的方程可以与实验生成和计算的数据拟合。未来的研究项目应包括在最佳条件下进行分析,以便验证与最佳条件外产生的值相比,ZOFORC值可能发生的变化。
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引用次数: 0
Diagnosis and Biocontrol of Sporisorium scitamineum Associated with Whip Smut Sugarcane 甘蔗黑穗病相关黑穗病孢子菌的诊断与生物防治
Pub Date : 2023-08-25 DOI: 10.9734/ajbgmb/2023/v15i1326
E. El-Dawy, Y. Gherbawy, Omnia Salamah, Riham Alian, S. Ahmed, Samah Aoud, Rawda Mosa, Abd Elrahman Ahmed, N. Ali, Mohamed Ahmed, A. Mahmoud
Aim: Whip smut of sugarcane is the most serious and widely spread disease of sugarcane and causes a significant reduction in cane quantity and quality. This work aimed to assess the macroscopic and microscopic characteristics and the variability between isolates of Sporisorium scitamineum causal agent of smut in sugarcane. Materials and Methods: The fungus was isolated on Potato Dextrose Agar (PDA) medium. The morphological characters were described based on the growth diameter, texture, and colony colors. The microscopic description focused on the spore’s size from medium and teliospores from whips. Results: The colony appeared with white mycelial cotton and a yeast-shaped mycelial colony. In vitro, control of S. scitamineum isolates with endophytic fungi of Macrophomina phaseolina and Trichoderma viride was studied. The results showed that the two fungi could inhibit the growth of S. scitamineum. A pathogenicity test was carried out on sugarcane cuttings by inoculating the buds with spore suspension of S. scitamineum, which showed a pathogenic effect ranging from 50–100%. Also, other sugarcane cuttings were inoculated by the pathogen and Trichoderma viride as a biocontrol agent that inhibited the pathogen growth completely in four strains. Conclusion: Trichoderma viride is the safely biocontrol agent against S. scitamineum.
目的:甘蔗鞭黑穗病是甘蔗最严重和最广泛传播的病害,造成甘蔗数量和质量的严重下降。本研究旨在评价甘蔗黑穗病病原菌黑穗病孢子孢菌的宏观和微观特征及其分离株间的变异。材料与方法:在马铃薯葡萄糖琼脂(PDA)培养基上分离真菌。根据生长直径、质地和菌落颜色描述了形态特征。显微镜下的描述主要集中在中芽孢的大小和鞭芽孢的远孢子上。结果:菌落中菌丝棉呈白色,菌丝菌落呈酵母状。采用内生真菌菜绿巨霉和绿色木霉对木棉葡萄球菌进行了体外抑菌试验。结果表明,两种真菌均能抑制黑穗病葡萄球菌的生长。用酵母孢子悬浮液对甘蔗扦插进行了致病性试验,结果表明,酵母孢子悬浮液的致病性为50% ~ 100%。另外,在其他甘蔗插枝上接种该病原菌和绿色木霉作为生物防治剂,4株病原菌完全被抑制生长。结论:绿色木霉是一种安全的防菌剂。
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引用次数: 0
Perception and Attitude towards Involvement of Males in Family Planning Practices in Nigeria 对尼日利亚男性参与计划生育的看法和态度
Pub Date : 2023-08-24 DOI: 10.9734/ajbgmb/2023/v15i1325
Adedapo Oluwafunmilayo Victoria, Aremu Fiyinfoluwa Moses, A. Ifeoluwapo
Aim: The study is designed to assess the perception and attitude towards the involvement of males in family planning practices in Nigeria. Methodology: This study design was a descriptive cross-sectional design, whose population were males (15-55 years), and selected via the convenience sampling technique. The research instrument was a semi-structured questionnaire on male involvement in family planning and was subjected to face and content validity (Cronbach Alpha = 0.673). The study data (responses) were analysed using simple frequency, percentages, and means, with the Statistical Packages for Social Sciences (SPSS) V 21. Results: Most of the men (n=267; 96.4%) have good knowledge of family planning, and there is a medium level of men’s involvement (n=141; 50.9%) towards family planning practices. Furthermore, regarding their behaviours towards family planning methods involvement, 208 (75.1%) men disagreed that family planning is meant for only females and that contraceptives are not working for males, while all the men (n=277; 100 %) disagreed that family planning is meant for the literate only. More so, half of the men (n=147; 53.1%) rejected that family planning delay pregnancy, while 208 (75.1%) men accepted that it prevents pregnancies. These results proved that the men do not believe only the literate utilize family planning methods. Conclusion: Most males are knowledgeable about family planning and many adopted condoms as their methods of family planning, which implies that men could be effectively involved in family planning with proper and effective education.
目的:本研究旨在评估尼日利亚对男性参与计划生育实践的看法和态度。方法:本研究设计为描述性横断面设计,研究对象为15-55岁的男性,采用方便抽样方法。研究工具为半结构式男性参与计划生育问卷,采用面孔效度和内容效度测试(Cronbach Alpha = 0.673)。使用社会科学统计软件包(SPSS) V 21,使用简单的频率、百分比和平均值分析研究数据(回应)。结果:大多数男性(n=267;96.4%)对计划生育有良好的了解,男性的参与程度中等(n=141;50.9%)推行计划生育。此外,在涉及计划生育方法的行为方面,208名(75.1%)男性不同意计划生育只适用于女性,避孕药具对男性不起作用,而所有男性(n=277;百分之百)不同意计划生育只适用于识字的人。更有一半的男性(n=147;53.1%的男性认为计划生育会延迟怀孕,而208名(75.1%)男性认为计划生育可以预防怀孕。这些结果证明,男性并不认为只有识字的人才使用计划生育方法。结论:大多数男性对计划生育有一定的了解,很多男性选择使用避孕套作为他们的计划生育方式,这意味着通过适当和有效的教育,男性可以有效地参与计划生育。
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引用次数: 0
Study of Inter-relatedness between Hepato-renal Indices and Essential Minerals during the Last Trimester of Pregnancy 妊娠晚期肝肾指标与必需矿物质相互关系的研究
Pub Date : 2023-08-21 DOI: 10.9734/ajbgmb/2023/v15i1324
O. T. Oyediran, Rashidat Abidemi Oladiti, G. Joseph, A. Iyanda
Purpose: Earlier on, it was reported that altered hepato-renal parameters and depletions of some nutrients co-existed at third trimester among the study participants. Yet the role low levels of nutrients played in altered hepato-renal axis (i.e. a possible association between the two) was not investigated. Even though liver is known for its physiologic importance in the metabolism of various metals and abnormal levels of certain elements also induce alterations in physiologic processes in specific organs. The study is aimed at investigating correlation between nutritional parameters (total protein, albumin, calcium, magnesium) and hepato-renal indices (alanine aminotransferase, aspartate aminotransferase, bilirubin, alkaline phosphatase, urea and creatinine) at the last trimester of pregnancy. Study Design: This is a cross-sectional study. Methods/Participants: Forty pregnant women in the third trimester (29 weeks to term) were recruited as test group while another group of 40 women (age-matched, non-pregnant) served as control. 5 mL of blood was collected and used for estimation of nutritional indices and hepato-renal markers. Information on birth weight was obtained. Data were analyzed using Pearson’s correlation coefficient.  P≤ 0.05 was considered significant. Results: Data obtained from the study revealed that there were no correlations between any nutritional marker and hepato-renal indices. Similarly, nutritional markers were not correlated with birth weight. Conclusion: There is no indication that there is a relationship between abnormal nutritional markers and indices of nephro-hepatic activities in third trimester women that had earlier being reported to feature abnormal liver and kidney function.  
目的:早些时候,有报道称,在研究参与者中,在妊娠晚期,肝肾参数的改变和一些营养物质的消耗并存。然而,低水平的营养物质在改变肝肾轴中所起的作用(即两者之间可能存在的关联)尚未得到调查。尽管肝脏在各种金属的代谢中具有重要的生理作用,但某些元素的异常水平也会引起特定器官生理过程的改变。本研究旨在探讨妊娠后期营养参数(总蛋白、白蛋白、钙、镁)与肝肾指标(丙氨酸转氨酶、天冬氨酸转氨酶、胆红素、碱性磷酸酶、尿素和肌酐)的相关性。研究设计:这是一项横断面研究。方法/参与者:招募40名妊娠晚期(29周到足月)的孕妇作为试验组,另一组40名妇女(年龄匹配,未怀孕)作为对照组。取血5ml,测定营养指标和肝肾指标。获得了有关出生体重的资料。采用Pearson相关系数对数据进行分析。P≤0.05认为差异有统计学意义。结果:研究数据显示,任何营养指标与肝肾指标之间均无相关性。同样,营养指标与出生体重无关。结论:在早期被报道为肝肾功能异常的妊娠晚期妇女中,没有迹象表明营养指标异常与肝肾活动指标之间存在关系。
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引用次数: 0
Phylogenetic Analysis of Acacia nilotica and Coffea arabica Using Protein Sequences from the Chloroplast RBCL Gene 利用叶绿体RBCL基因蛋白序列分析尼罗刺槐和阿拉比卡咖啡的系统发育
Pub Date : 2023-08-18 DOI: 10.9734/ajbgmb/2023/v15i1323
Kisoi George, Kinyua K. Johnson, W. Fred
The genus Acacia is important economically to local communities in sub-Saharan Africa for its medicinal and beverage usage. The bark extract is used for making a coffee-like concoction, which is named by locals as ‘Wild coffee’ due to its brown color. The objective of this study was to compare the evolutionary analysis of A. nilotica and C. arabica -based amino acids sequence of the ribulose-1,5-bisphosphate carboxylase. The results showed that A. nilotica and C. arabica are polyphyletic and the subspecies A. nilotica and A. n. hemispherica formed the sister group, same as the species C. arabica, C. salvatrix, and C. racemosa.  The chloroplast-encoded rbcL gene, which encodes the large subunit of ribulose-1, 5-bisphosphate carboxylase/oxygenase (Rubisco), is a valuable marker for investigating the evolutionary relationships between plant species. In this study, we conducted a phylogenetic analysis of two economically and ecologically significant plants, Acacia nilotica and Coffea arabica, using protein sequences derived from the chloroplast rbcL gene. A multiple sequence alignment of the rbcL protein sequences was performed, and a maximum likelihood phylogenetic tree was constructed using the RAxML algorithm. The tree was rooted using a Thiotrichales bacterium as an outgroup sequence to establish the evolutionary context. Branch support values were calculated to assess the statistical robustness of the inferred relationships. The results of the phylogenetic analysis revealed the evolutionary relationship between Acacia nilotica and Coffea arabica within the context of other plant taxa. The phylogenetic tree provided insights into their shared ancestry, divergence time, and taxonomic placement within the larger plant kingdom. We identified conserved regions in the rbcL protein sequences, reflecting functional importance, as well as divergent regions, suggesting potential adaptive evolution. The significance of our study lies in understanding the evolutionary history and taxonomic position of these economically important plant species. This knowledge has implications for biodiversity conservation, crop improvement, and ecosystem management. The study also highlights the utility of the rbcL gene as a valuable tool for investigating plant phylogenetics. In conclusion, our phylogenetic analysis using the rbcL protein sequences provides valuable insights into the evolutionary relationship between Acacia nilotica and Coffea arabica. This research contributes to our understanding of plant evolution and has practical applications in various fields, from agriculture to conservation.
金合欢属因其药用和饮料用途而对撒哈拉以南非洲的当地社区具有重要的经济意义。这种树皮提取物被用来制作一种类似咖啡的混合物,由于它的棕色,被当地人称为“野生咖啡”。本研究的目的是比较尼罗卡树和阿拉比卡树核酮糖-1,5-二磷酸羧化酶的氨基酸序列的进化分析。结果表明,南芥与阿拉比卡属多系进化关系,南芥亚种与半球南芥亚种为姊妹类群,南芥亚种与阿拉比卡亚种、萨尔特里亚种、总状叶南芥亚种为姊妹类群。叶绿体编码的rbcL基因编码核酮糖- 1,5 -二磷酸羧化酶/加氧酶(Rubisco)的大亚基,是研究植物物种间进化关系的重要标记。在这项研究中,我们利用叶绿体rbcL基因的蛋白质序列对两种具有经济和生态意义的植物——尼罗刺槐(Acacia nilotica)和阿拉比卡(Coffea arabica)进行了系统发育分析。对rbcL蛋白序列进行多序列比对,利用RAxML算法构建最大似然系统发育树。这棵树是用硫三叉菌作为外群序列来建立进化背景的。计算分支支持值以评估推断关系的统计稳健性。系统发育分析结果揭示了尼罗刺槐与阿拉比卡咖啡在其他植物类群中的进化关系。系统发育树提供了对它们共同祖先、分化时间和在更大的植物界中的分类位置的见解。我们确定了rbcL蛋白序列中的保守区域,反映了功能的重要性,以及发散区域,表明潜在的适应性进化。本研究的意义在于了解这些重要经济植物的进化历史和分类地位。这些知识对生物多样性保护、作物改良和生态系统管理具有重要意义。该研究还强调了rbcL基因作为研究植物系统发育的有价值工具的效用。总之,我们利用rbcL蛋白序列进行的系统发育分析为尼罗刺槐和阿拉比卡咖啡的进化关系提供了有价值的见解。这项研究有助于我们对植物进化的理解,并在从农业到保护等各个领域具有实际应用价值。
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引用次数: 0
Evaluating the Prevalence of Malaria Parasite Infection among Adults in Wetlands Using Nested PCR and High Resolution Melting Analysis 利用巢式PCR和高分辨率融化分析评估湿地成人疟疾寄生虫感染流行情况
Pub Date : 2023-08-07 DOI: 10.9734/ajbgmb/2023/v14i4322
F. Ogbole, Chidi Uzoma Igwe, Henrietta Chinyere Onuoha, Chiamaka Perpetua Nzebude
Background: Wetlands serve as breeding grounds for mosquitoes, the vector of malaria Plasmodium. Effective detection of Plasmodium infection requires a very sensitive                        method. Aim: The aim of the present study was to evaluate the prevalence of malaria parasite infection in Sagbama LGA, Bayelsa State using nested PCR and high resolution melting analysis (HRMA) technique in comparison with microscopy. Methods: A community based cross sectional study design was employed to randomly select 206 study participants. DNA was extracted from 200 ⴗl of whole blood of each participant and a set of primers was used to target and amplify the 18S rRNA gene of Plasmodium falciparum in both molecular methods. Result: The prevalence of Plasmodium falciparum infection by microscopy was 33.01% (5.8% asymptomatic, 17% mild and 10.2% severe malaria).The prevalence of malaria parasite infection by nested genomic PCR was 71.36% (asymptomatic, 42.20% mild, 18.93%and severe malaria, 10.19%). Prevalence of malaria parasite infection by high resolution melting analysis 92.71% (asymptomatic, 63.59%, mild, 18.93% and severe, 10.19%). All the study participants that were positive for microscopy and nested genomic PCR were also positive for high resolution melting analysis. There were 59.71% and 21.36% false negatives by microscopy and nested PCR respectively. McNemar`s test for pair-wise performance comparisons among the different methods was statistically significant (p < 0.001). High parasite density (19927 ± 749 parasites/µl blood) and hyper parasite density (103667 ± 5214 parasites/ⴗl of blood) were found among asymptomatic and severe malaria subjects (P < 0.000). Conclusion: In conclusion, a high malaria parasite infection prevalence of 92.72% was found in Sagbama LGA. This requires urgent attention especially asymptomatic malaria. HRMA was the most sensitive molecular method and is therefore recommended for future molecular detection of malaria infection.
背景:湿地是蚊子的繁殖地,蚊子是疟疾疟原虫的传播媒介。有效地检测疟原虫感染需要一种非常灵敏的方法。目的:采用巢式PCR和高分辨率熔融分析(HRMA)技术,比较巴耶尔萨州Sagbama LGA地区疟疾寄生虫感染的流行情况。方法:采用基于社区的横断面研究设计,随机抽取206名研究对象。从每个参与者的200ⴗl全血中提取DNA,使用一套引物,用两种分子方法靶向扩增恶性疟原虫18S rRNA基因。结果:镜检恶性疟原虫感染率为33.01%,其中无症状者5.8%,轻度者17%,重度者10.2%。巢式基因组PCR检测结果显示,无症状人群疟疾感染率为71.36%,其中轻度疟疾占42.20%,18.93%,重度疟疾占10.19%。高分辨率融解分析疟疾寄生虫感染率为92.71%(无症状者为63.59%,轻度者为18.93%,重度者为10.19%)。所有在显微镜和巢式基因组PCR中呈阳性的研究参与者在高分辨率熔化分析中也呈阳性。镜检和巢式PCR假阴性检出率分别为59.71%和21.36%。不同方法间两两性能比较的McNemar检验具有统计学意义(p < 0.001)。无症状和重度疟疾患者的疟原虫高密度(19927±749只/ μ l血)和高密度(103667±5214只/ⴗl血)(P < 0.000)。结论:Sagbama地区疟疾感染率较高,为92.72%。这需要紧急关注,特别是无症状疟疾。HRMA是最敏感的分子方法,因此推荐用于未来疟疾感染的分子检测。
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Asian Journal of Biochemistry, Genetics and Molecular Biology
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