Astragalus

黄芪
  • 文章类型: Journal Article
    经典的黄芪-决明子小枝药物对具有悠久的疗效。然而,目前对黄芪桂枝汤(ACD)物质基础的研究较少。建立了UPLC-Q-TOF-MS对ACD主要化学成分进行分类鉴定的方法,并利用HPLC-UV比较了单汤和共汤的成分差异。研究了ACD对2型糖尿病(T2D)大鼠的治疗作用。从ACD中拆分出35种化合物。从黄芪汤剂中推导出15个化合物,而从决明子枝中鉴定出9种化合物。中药配对对中药汤剂的化学成分有显着影响。ACD对T2D大鼠的症状有较明显的缓解作用。与单一草药的应用相比。
    The classic Astragalus-Cassia twig drug pair has a long history of proven efficacy. However, a fewer studies on material basis of the Astragalus and Cassia twig decoction (ACD) was researched at present. The method of UPLC-Q-TOF-MS for classifying and identifying the main chemical components of ACD was established and the differences in composition between single decoction and co-decoction were compared by using HPLC-UV. The therapeutic role of ACD on type 2 diabetes (T2D) rats was investigated. Thirty-five compounds were resolved from the ACD. Fifteen compounds were deduced from the decoction of Astragalus, whereas nine compounds were identified from Cassia twig. Pairing of herbs make a significant effect on the chemical composition of herbal decoction. ACD can play a more obvious role in alleviating the symptoms of T2D rats, compared to the application of single herb.
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  • 文章类型: Journal Article
    正己烷,乙酸乙酯,乙醇,乙醇/水(70%乙醇),并研究了黄芪地上部分的水提取物的抗氧化潜力,酶抑制活性(抗乙酰胆碱酯酶[AChE],抗丁酰胆碱酯酶[BChE],抗酪氨酸酶,抗淀粉酶,和抗葡萄糖苷酶)和抗增殖作用(针对结肠腺癌细胞系[HT-29],胃癌细胞系[HGC-27],前列腺癌细胞系[DU-145],乳腺癌细胞系[MDA-MB-231],和宫颈腺癌细胞系[HeLa])。此外,使用经过验证的分光光度和高压液相色谱-电喷雾电离/串联质谱方法评估了提取物的植物化学特征。一般来说,70%乙醇提取物表现出最强的抗氧化性能,它是总酚类成分最丰富的来源。我们的发现表明,乙酸乙酯提取物是最有效的BChE抑制剂(11.44mg加兰他敏当量[GALAE]/g),其次是乙醇提取物(8.51mgGALAE/g),而乙醇提取物是最有前途的AChE抑制剂(3.42mgGALAE/g),其次是乙醇/水提取物(3.17mgGALAE/g)。在A.aduncus地上部分的乙醇/水提取物中观察到优异的酪氨酸酶抑制活性(66.25mg曲酸当量/g)。这些结果表明,乙酸乙酯提取物对HGC-27细胞具有最大的细胞毒性作用(IC50:36.76µg/mL),乙醇提取物对HT-29细胞(IC50:30.79µg/mL),和水提取物对DU-145细胞(IC50:37.01µg/mL)。在乙醇提取物中最高的总黄酮含量和最高的单个化合物含量之间观察到了很强的相关性。包括芦丁,金丝桃苷,异槲皮苷,delphinidin-3,5-二葡萄糖苷(delphinidin-3,5-O-二葡萄糖苷),和山奈酚-3-葡萄糖苷(山奈酚-3-O-葡萄糖苷)。在本研究中,A.aduncus植物被认为是抗氧化剂的新来源,酶抑制剂,和抗癌剂,可用作未来有益于健康的天然产品。
    The n-hexane, ethyl acetate, ethanol, ethanol/water (70% ethanol), and water extracts of Astragalus aduncus aerial parts were investigated for their antioxidant potential, enzyme inhibition activity (anti-acetylcholinesterase [AChE], anti-butyrylcholinesterase [BChE], antityrosinase, antiamylase, and antiglucosidase) and antiproliferative effect (against colon adenocarcinoma cell line [HT-29], gastric cancer cell line [HGC-27], prostate carcinoma cell line [DU-145], breast adenocarcinoma cell line [MDA-MB-231], and cervix adenocarcinoma cell line [HeLa]). In addition, the phytochemical profile of the extracts was evaluated using validated spectrophotometric and high-pressure liquid chromatography-electrospray ionization/tandem mass spectroscopy methods. Generally, the 70% ethanol extract demonstrated the strongest antioxidant properties, and it was the richest source of total phenolic constituents. Our findings indicated that the ethyl acetate extract was the most potent BChE inhibitor (11.44 mg galantamine equivalents [GALAE]/g) followed by the ethanol extract (8.51 mg GALAE/g), while the ethanol extract was the most promising AChE inhibitor (3.42 mg GALAE/g) followed by the ethanol/water extract (3.17 mg GALAE/g). Excellent tyrosinase inhibitory activity (66.25 mg kojic acid equivalent/g) was observed in ethanol/water extracts of the aerial part of A. aduncus. Тhese results showed that the most cytotoxic effects were exhibited by the ethyl acetate extract against HGC-27 cells (IC50: 36.76 µg/mL), the ethanol extract against HT-29 cells (IC50: 30.79 µg/mL), and the water extract against DU-145 cells (IC50: 37.01 µg/mL). A strong correlation was observed between the highest total flavonoid content and the highest content of individual compounds in the ethanol extract, including rutin, hyperoside, isoquercitrin, delphinidin-3,5-diglucoside (delphinidin-3,5-O-diglucoside), and kaempferol-3-glucoside (kaempferol-3-O-glucoside). In the present study, the A. aduncus plant was considered a new source of antioxidants, enzyme inhibitors, and anticancer agents and could be used as a future health-benefit natural product.
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  • 文章类型: Journal Article
    通过荟萃分析确定黄芪联合肾素-血管紧张素-醛固酮系统(RAAS)阻滞剂治疗III期糖尿病肾病(DN)的有效性和安全性。
    PubMed,Embase,科克伦图书馆,威利,和WebofScience数据库搜索2007年8月至2022年8月发表的文章。纳入黄芪联合RAAS受体阻滞剂治疗III期DN的临床研究。采用RevMan5.1和Stata14.3软件进行Meta分析。
    本次荟萃分析共包括32篇论文,包含来自随机对照试验的2462名患者,1244人接受联合治疗,1218人仅接受RAAS阻滞剂。黄芪联合RAAS阻滞剂的总有效率(TER)(平均差[MD]3.63,95%置信区间[CI]2.59-5.09)和尿蛋白排泄率(UPER)显着降低,血清肌酐(Scr),血尿氮(BUN)和糖化血红蛋白(HbAlc)水平。在亚组分析中,联合黄芪和血管紧张素受体阻滞剂显著降低空腹血糖(FPG)和24h尿蛋白(24hUTP)水平,与黄芪和血管紧张素转换酶抑制剂联合治疗比较。同时,后者显着降低了尿微量蛋白(β2-MG)。重要的是,敏感性分析证实了研究的稳定性,UPER未检测到发表偏倚,BUN,HbAlc,FPG,或β2-MG。然而,TER,SCr,24hUTP结果提示可能的发表偏倚。
    黄芪-RAAS阻滞剂联合治疗是安全的,可改善预后;然而,严格随机,大规模,多中心,需要双盲试验来评估其在III期DN中的疗效和安全性.
    肾素-血管紧张素-醛固酮系统(RAAS)抑制剂通常用于治疗糖尿病性神经病(DN),黄芪成分已知可改善DN症状。我们旨在建立黄芪与RAAS抑制剂联合使用的有效性和安全性。黄芪联合RAAS抑制剂可提高糖尿病神经病变治疗的总有效率,降低尿蛋白排泄率,血清肌酐,血尿素氮和HbAlc.敏感性分析确认了研究的稳定性,而发表偏倚被检测为总有效率,血清肌酐,和24小时尿蛋白水平。
    UNASSIGNED: To determine the efficacy and safety of Astragalus combined with renin-angiotensin-aldosterone system (RAAS) blockers in treating stage III diabetic nephropathy (DN) by meta-analysis.
    UNASSIGNED: PubMed, Embase, Cochrane Library, Wiley, and Web of Science databases were searched for articles published between August 2007 and August 2022. Clinical studies on Astragalus combined with RAAS blockers for the treatment of stage III DN were included. Meta-analysis was performed by RevMan 5.1 and Stata 14.3 software.
    UNASSIGNED: A total of 32 papers were included in this meta-analysis, containing 2462 patients from randomized controlled trials, with 1244 receiving the combination treatment and 1218 solely receiving RAAS blockers. Astragalus combined with RAAS blockers yielded a significantly higher total effective rate (TER) (mean difference [MD] 3.63, 95% confidence interval [CI] 2.59-5.09) and significantly reduced urinary protein excretion rate (UPER), serum creatinine (Scr), blood urine nitrogen (BUN) and glycosylated hemoglobin (HbAlc) levels. In subgroup analysis, combining astragalus and angiotensin receptor blocker significantly lowered fasting plasma glucose (FPG) and 24 h urinary protein (24hUTP) levels, compared with the combined astragalus and angiotensin-converting enzyme inhibitor treatment. Meanwhile, the latter significantly decreased the urinary microprotein (β2-MG). Importantly, the sensitivity analysis confirmed the study\'s stability, and publication bias was not detected for UPER, BUN, HbAlc, FPG, or β2-MG. However, the TER, SCr, and 24hUTP results suggested possible publication bias.
    UNASSIGNED: The astragalus-RAAS blocker combination treatment is safe and improves outcomes; however, rigorous randomized, large-scale, multi-center, double-blind trials are needed to evaluate its efficacy and safety in stage III DN.
    Renin-angiotensin-aldosterone system (RAAS) inhibitors are commonly used to treat diabetic neuropathy (DN) and Astragalus membranaceus components are known to improve DN symptoms.We aimed to establish the efficacy and safety of using Astragalus combined with RAAS inhibitors.Astragalus combined with RAAS inhibitors enhances the total effective rate of diabetic neuropathy response to treatment and reduces urinary protein excretion rate, serum creatinine, blood urea nitrogen and HbAlc.Sensitivity analysis affirms study stability, while publication bias was detected for total effective rate, serum creatinine, and 24 h urinary protein levels.
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  • 文章类型: Journal Article
    背景:糖尿病会导致慢性肾脏疾病(CKD)和肾衰竭,需要透析或移植。黄芪,一种常见的草药和美国药典注册的食品成分,通过回顾性和临床前数据显示肾脏具有保护作用,但长期前瞻性临床证据有限。该试验旨在评估黄芪对糖尿病CKD患者肾功能下降的有效性。
    方法:这是随机的,评估员-盲,标准护理控制,2018年7月至2022年4月,多中心临床试验从7家公共门诊诊所和香港社区随机分配了118例估计肾小球滤过率(eGFR)为30~90ml/min/1.73m2,尿白蛋白与肌酐比值(UACR)为300~5000mg/g的患者,接受口服黄芪颗粒(每日15g生药当量)或单独继续标准治疗作为对照48周.主要结果是eGFR变化的斜率(用于样本量计算)和意向治疗人群的UACR。次要结果包括终点血压,生物化学,生物标志物,伴随的药物变化和不良事件。(ClinicalTrials.gov:NCT03535935)结果:在48周期间,使用黄芪时,eGFR下降斜率的估计差异为每年4.6ml/min/1.73m2(95CI:1.5~7.6,p=0.003).对于UACR,估计的组间变化斜率的比例差异不显著(1.14,95CI:0.85~1.52,p=0.392).记录了31例黄芪治疗患者和41例标准护理控制患者的117例不良事件。在黄芪治疗的患者中,48周的终点收缩压降低了7.9mmHg(95CI:-12.9至-2.8,p=0.003)。113例(96%)和107例(91%)患者有随机化后和终点主要结局指标,分别。
    结论:在2型糖尿病患者中,2至3期CKD和大量白蛋白尿,添加黄芪48周,在标准护理的基础上进一步稳定肾功能。
    BACKGROUND: Diabetes leads to chronic kidney disease (CKD) and kidney failure, requiring dialysis or transplantation. Astragalus, a common herbal medicine and US pharmacopeia-registered food ingredient, is shown kidney protective by retrospective and preclinical data but with limited long-term prospective clinical evidence. This trial aimed to assess the effectiveness of astragalus on kidney function decline in macroalbuminuric diabetic CKD patients.
    METHODS: This randomized, assessor-blind, standard care-controlled, multi-center clinical trial randomly assigned 118 patients with estimated glomerular filtration rate (eGFR) of 30-90 ml/min/1.73m2 and urinary albumin-to-creatinine ratio (UACR) of 300-5000 mg/g from 7 public outpatient clinics and the community in Hong Kong between July 2018 and April 2022 to add-on oral astragalus granules (15 gs of raw herbs daily equivalent) or to continue standard care alone as control for 48 weeks. Primary outcomes were the slope of change of eGFR (used for sample size calculation) and UACR of the intention-to-treat population. Secondary outcomes included endpoint blood pressures, biochemistry, biomarkers, concomitant drug change and adverse events. (ClinicalTrials.gov: NCT03535935) RESULTS: During the 48-week period, the estimated difference in the slope of eGFR decline was 4.6 ml/min/1.73m2 per year (95 %CI: 1.5 to 7.6, p = 0.003) slower with astragalus. For UACR, the estimated inter-group proportional difference in the slope of change was insignificant (1.14, 95 %CI: 0.85 to 1.52, p = 0.392). 117 adverse events from 31 astragalus-treated patients and 41 standard care-controlled patients were documented. The 48-week endpoint systolic blood pressure was 7.9 mmHg lower (95 %CI: -12.9 to -2.8, p = 0.003) in the astragalus-treated patients. 113 (96 %) and 107 (91 %) patients had post-randomization and endpoint primary outcome measures, respectively.
    CONCLUSIONS: In patients with type 2 diabetes, stage 2 to 3 CKD and macroalbuminuria, add-on astragalus for 48 weeks further stabilized kidney function on top of standard care.
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  • 文章类型: Journal Article
    黄芪是一种具有明显根际效应的药用植物。目前,云南西北地区有许多具有较高应用价值但知名度和资源储量较低的黄芪属植物,中国。在这项研究中,利用宏基因组学技术分析了福雷士根际土壤微生物多样性和群落结构,A.acaulis,和在云南西北部特殊的高寒环境中生长的A.ernesti植物,中国,在3225至4353m的不同海拔范围内。对这些微生物进行了分类学注释,以获得A.forrestii的24门和501属,30门和504属。以及A.ernesti的39门和533属。总的来说,优势细菌门包括变形杆菌,放线菌,和酸细菌,而优势真菌是子囊菌和担子菌。在属一级,缓生根瘤菌,阿菲皮亚,Paraburkholderia是最常见的细菌,和Hyaloscypha,假木曲,红菇属是优势真菌属。其中一些被认为是生物控制微生物,可以维持寄主黄芪植物的生长和健康。冗余分析显示pH值,TN,和SOM对微生物群落结构有显著影响(p<0.05)。最后,三萜,类黄酮,多糖,和氨基酸代谢在富集的KEGG途径中占很大比例,这可能有助于黄芪植物中生物活性成分的合成。
    Astragalus is a medicinal plant with obvious rhizosphere effects. At present, there are many Astragalus plants with high application value but low recognition and resource reserves in the northwestern area of Yunnan province, China. In this study, metagenomics was used to analyze the microbial diversity and community structure of rhizosphere soil of A. forrestii, A. acaulis, and A. ernestii plants grown in a special high-cold environment of northwestern Yunnan, China, at different altitudes ranging from 3225 to 4353 m. These microbes were taxonomically annotated to obtain 24 phyla and 501 genera for A. forrestii, 30 phyla and 504 genera for A. acaulis, as well as 39 phyla and 533 genera for A. ernestii. Overall, the dominant bacterial phyla included Proteobacteria, Actinobacteria, and Acidobacteria, while the dominant fungal ones were Ascomycota and Basidiomycota. At the genus level, Bradyrhizobium, Afipia, and Paraburkholderia were the most prevalent bacteria, and Hyaloscypha, Pseudogymnoascus, and Russula were the dominant fungal genera. Some of them are considered biocontrol microbes that could sustain the growth and health of host Astragalus plants. Redundancy analysis revealed that pH, TN, and SOM had a significant impact on the microbial community structures (p < 0.05). Finally, triterpene, flavonoid, polysaccharide, and amino acid metabolisms accounted for a high proportion of the enriched KEGG pathways, which possibly contributed to the synthesis of bioactive constituents in the Astragalus plants.
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  • 文章类型: Journal Article
    急性肾损伤(AKI)是临床上最常见的危重疾病之一。肾小球滤过率下降,氮产品的保留,水和电解质紊乱,以酸碱失衡为主要临床表现。目前,急性肾损伤没有有效的治疗方法,但是主要的治疗方法是治愈原发疾病,消除风险因素,保持酸碱和水电解质平衡,接受肾脏置换手术.然而,死亡率仍然很高。调查和研究表明,ICU急性肾损伤患者的死亡率为5-80%[1]。近年来,中医药以其完整的辩证体系和丰富的经验在急性肾损伤治疗中得到了广泛的应用。黄芪是中药治疗急性肾损伤的常用药物。黄芪甲苷是中药的主要活性成分,黄芪。本文就黄芪甲苷治疗急性肾损伤的相关研究作一综述。
    Acute kidney injury (AKI) is one of the most common clinical critical illnesses, with decreased glomerular filtration rate, retention of nitrogen products, water and electrolyte disorders, and acid-base imbalance as the main clinical manifestations. Presently, there is no effective treatment for acute kidney injury, but the main treatment is to cure the primary disease, remove risk factors, maintain acid-base and water-electrolyte balance, and undergo kidney replacement. However, the mortality rate is still high. Investigations and studies showed that the mortality rate of patients with acute kidney injury in the ICU is 5-80% [1]. In recent years, Chinese medicine has been widely used in acute kidney injury treatment due to its complete dialectical system and rich experience. Astragalus is a commonly used medicine in traditional Chinese medicine to treat acute kidney injury. Astragaloside IV is the main active component of traditional Chinese medicine, Astragalus membranaceus. This article summarizes the relevant studies on treating acute kidney injury with astragaloside IV.
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  • 文章类型: Journal Article
    This study investigates Astragalus\'s efficacy as a novel therapeutic option for primary liver cancer (PLC), capitalizing on its anti-inflammatory and antiviral effects. We utilized network pharmacology to unveil Astragalus\'s potential targets against PLC, revealing significant gene expression alterations in treated samples-20 genes were up-regulated, and 20 were down-regulated compared to controls. Our analysis extended to single-cell resolution, where we processed scRNA-seq data to discern 15 unique cell clusters within the immune, malignant, and stromal compartments through advanced algorithms like UMAP and tSNE. To delve deeper into the functional implications of these gene expression changes, we conducted comprehensive gene ontology and Kyoto Encyclopedia of Genes and Genomes pathway enrichment analyses, alongside Gene Set Variation Analysis, to elucidate the biological processes and pathways involved. Further, we constructed protein-protein interaction networks to visualize the intricate molecular interplay, highlighting the down-regulation of MT1E in PLC cells, a finding corroborated by quantitative polymerase chain reaction. Molecular docking studies affirmed the potent interaction between Astragalus\'s active compounds and MT proteins, underscoring a targeted therapeutic mechanism. Our investigation also encompassed a detailed cellular landscape analysis, identifying nine cell subgroups related to MT1 expression and specifying five cell subsets through the SingleR package. Advanced trajectory and cell-cell interaction analyses offered deeper insights into the dynamics of MT1-associated cellular subpopulations. This comprehensive methodology not only underpins Astragalus\'s promising role in PLC treatment but also advances our understanding of its molecular and cellular mechanisms, paving the way for targeted therapeutic strategies.
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  • 文章类型: Journal Article
    由于黄芪属具有许多重要的药用植物种类,本文旨在研究黄芪的植物化学成分和一些生物活性。四个器官的甲醇部分(茎,鲜花,叶子,根和整个植物)通过液相色谱电喷雾串联质谱(LC-ESI-MS/MS)分析进行定量和鉴定。橙皮苷,金丝桃苷,对羟基苯甲酸,原儿茶酸和对香豆酸被确定为提取物中的主要化合物。在所有细胞中,叶甲醇(Lm)提取物对HeLa细胞具有最高的细胞毒性作用(IC50=0.069μg/mL)。橙皮苷,是A.gunnobus提取物中最丰富的化合物,根据Pearson相关性测试结果,发现与HeLa细胞中观察到的细胞毒性作用呈强负相关,并且通过对接研究对靶向蛋白具有最佳的结合亲和力。抗菌活性结果表明,对所有提取物最敏感的细菌被鉴定为化脓性链球菌,具有9-11mm的抑制区和8192mg/mL的MIC值。作为研究的结果,有人建议,A.gunnobus可以被认为是一个有希望的来源,有助于对抗癌症。
    Since Astragalus is a genus with many important medicinal plant species, the present work aimed to investigate the phytochemical composition and some biological activities of Astragalus gymnolobus. The methanolic fractions of four organs (stems, flowers, leaves, root and whole plant) were quantified and identified by Liquid Chromatography Electrospray Ionization Tandem Mass Spectrometry (LC-ESI-MS/MS) analysis. Hesperidin, hyperoside, p-hydroxybenzoic acid, protocatechuic acid and p-coumaric acid were identified as main compounds among the extracts. Among all cells, leaf methanol (Lm) extract had the highest cytotoxic effect on HeLa cells (IC50 = 0.069 μg/mL). Hesperidin, the most abundant compound in A. gymnolobus extract, was found to show a strong negative correlation with the cytotoxic effect observed in HeLa cells according to Pearson correlation test results and to have the best binding affinity to targeted proteins by docking studies. The antimicrobial activity results indicated that the most susceptible bacterium against all extracts was identified as Streptococcus pyogenes with 9-11 mm inhibition zone and 8192 mg/mL MIC value. As a result of the research, it was suggested that A. gymnolobus could be considered as a promising source that contributes to the fight against cancer.
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  • 文章类型: Journal Article
    背景:黄芪是一种广泛使用的中药材料,由于其质量而容易混淆,价格和其他因素源于不同的起源。本文介绍了一种通过联合应用电子舌(ET)和电子眼(EE)以及轻型CNN变换器模型来快速追踪和检测黄芪的新方法。首先,ET和EE系统用于测量不同黄芪样品的味道指纹和外观图像,分别。三种谱变换方法,马尔可夫转移场(MTF),短时傅里叶变换(STFT)和递归图(RP),用于将ET信号转换为2D频谱图。然后,将所获得的ET谱图与EE图像融合以获得多模态信息。一个轻量级的混合模型,称为GETNet,目的是实现黄芪融合信息的模式识别。所提出的模型采用了改进的变压器模块和改进的Ghost瓶颈作为其骨干网络。互补地利用CNN和转换器架构的优势来实现局部和全局特征表示。此外,使用通道注意技术进一步优化了Ghost瓶颈,这提高了模型的特征提取效率。
    结果:实验表明,所提出的基于ET和EE设备的数据融合策略比独立传感设备具有更好的识别精度。
    结论:所提出的方法实现了高精度(99.1%)和召回(99.1%)值,提供了一种快速鉴定黄芪起源的新方法,它对涉及其他类型中草药的应用前景广阔。本文受版权保护。保留所有权利。
    BACKGROUND: Astragalus is a widely used traditional Chinese medicine material that is easily confused due to its quality, price and other factors derived from different origins. This article describes a novel method for the rapid tracing and detection of Astragalus via the joint application of an electronic tongue (ET) and an electronic eye (EE) combined with a lightweight convoluted neural network (CNN)-transformer model. First, ET and EE systems were employed to measure the taste fingerprints and appearance images, respectively, of different Astragalus samples. Three spectral transform methods - the Markov transition field, short-time Fourier transform and recurrence plot - were utilized to convert the ET signals into 2D spectrograms. Then, the obtained ET spectrograms were fused with the EE image to obtain multimodal information. A lightweight hybrid model, termed GETNet, was designed to achieve pattern recognition for the Astragalus fusion information. The proposed model employed an improved transformer module and an improved Ghost bottleneck as its backbone network, complementarily utilizing the benefits of CNN and transformer architectures for local and global feature representation. Furthermore, the Ghost bottleneck was further optimized using a channel attention technique, which boosted the model\'s feature extraction effectiveness.
    RESULTS: The experiments indicate that the proposed data fusion strategy based on ET and EE devices has better recognition accuracy than that attained with independent sensing devices.
    CONCLUSIONS: The proposed method achieved high precision (99.1%) and recall (99.1%) values, providing a novel approach for rapidly identifying the origin of Astragalus, and it holds great promise for applications involving other types of Chinese herbal medicines. © 2024 Society of Chemical Industry.
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  • 文章类型: Journal Article
    目的:黄芪(豆科),有3000多个物种,代表了整个北半球在形态上高度相似的物种的全球成功辐射。引起了系统学家和生物地质学家的关注,谁问过这个重要的干旱适应进化枝的非凡多样性背后可能是什么因素,是什么使它与物种丰富度少得多的近亲区分开来。
    方法:这里,首次使用广泛的系统发育取样,我们询问(1)黄芪是否具有辐射爆发的独特特征,或者多样化是否统一且与密切相关的分类群没有区别。然后我们测试了黄芪的物种多样性是否特别归因于其对(2)寒冷和干旱栖息地的偏好,(3)特殊土壤,或(4)染色体进化。最后,我们测试了(5)黄芪是否如提议的那样起源于中亚,以及(6)随后的生态位进化变化是否与其他大陆的殖民相关.
    结果:我们的结果指出了异质性在黄芪多样化中的重要性,与最早的差异相关的上升趋势,但与此处测试的任何非生物因素或生物地理区域化无关。我们确定的唯一潜在的与多样化相关的是染色体数量。生物地理变化与非生物环境有着密切的联系,突出了中亚作为生物地理门户的重要性。
    结论:我们的调查显示了对具有后勤挑战性的“巨型辐射”的系统发育和进化研究的重要性。“我们的发现拒绝了高度多样性背后的任何简单的关键创新,并强调了通常细微差别,导致物种丰富的进化枝的多因素过程。
    Astragalus (Fabaceae), with more than 3000 species, represents a globally successful radiation of morphologically highly similar species predominant across the northern hemisphere. It has attracted attention from systematists and biogeographers, who have asked what factors might be behind the extraordinary diversity of this important arid-adapted clade and what sets it apart from close relatives with far less species richness.
    Here, for the first time using extensive phylogenetic sampling, we asked whether (1) Astragalus is uniquely characterized by bursts of radiation or whether diversification instead is uniform and no different from closely related taxa. Then we tested whether the species diversity of Astragalus is attributable specifically to its predilection for (2) cold and arid habitats, (3) particular soils, or to (4) chromosome evolution. Finally, we tested (5) whether Astragalus originated in central Asia as proposed and (6) whether niche evolutionary shifts were subsequently associated with the colonization of other continents.
    Our results point to the importance of heterogeneity in the diversification of Astragalus, with upshifts associated with the earliest divergences but not strongly tied to any abiotic factor or biogeographic regionalization tested here. The only potential correlate with diversification we identified was chromosome number. Biogeographic shifts have a strong association with the abiotic environment and highlight the importance of central Asia as a biogeographic gateway.
    Our investigation shows the importance of phylogenetic and evolutionary studies of logistically challenging \"mega-radiations.\" Our findings reject any simple key innovation behind high diversity and underline the often nuanced, multifactorial processes leading to species-rich clades.
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