BA

巴尔得-别德尔综合征
  • 文章类型: Journal Article
    护士是医疗保健系统中最大的群体。当前的护理短缺仍然是医疗保健系统中的全球挑战。加速二级护理(ABSN)计划最早由圣路易大学于1971年提出,随后在美国大力发展。其目的是培养更多的护理人才,以解决美国穷人的医疗需求。在过去的几十年里,该项目已被世界上许多国家/地区实施,以解决其国内护理问题。作为解决严重护理短缺的策略,ABSN继续快速增长。中国作为世界第二人口大国,再加上逐年衰老,对护理人才的需求,而ABSN项目正好给了中国有效的启示。因此,本文介绍了华盛顿大学护理学士学位的基本设计,总结了培训模式的特点,并从基本情况中汲取经验,培训目标,课程和评价方法。迫切需要为我国加快护理教育提供指导和借鉴。
    Nurses are the largest group in the health care system. The current care shortage remains a global challenge in the healthcare system.The accelerated second-degree nursing (ABSN) program was first proposed by the University of St.Louis in 1971 and then vigorously developed in the United States. Its purpose is to train more nursing talents to solve the medical needs of the poor in the United States. In the past few decades, this project has been carried out by many countries around the world to solve their domestic nursing problems.As a strategy to address severe care shortages, ABSN is continuing to increase rapidly.China as the world\'s second most populous country, coupled with aging year by year, the demand for nursing talents, and the ABSN project just gave China effective inspiration.Therefore, this article introduces the basic design of the bachelor\'s degree in nursing at the University of Washington, summarizes the characteristics of the training model, and draws on experience from the basic situation, training objectives, courses and evaluation methods. It is urgent to provide guidance and reference for the acceleration of nursing education in China.
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  • 文章类型: Journal Article
    BempedoicAcid(BA)是一种新型药物,有可能作为他汀类药物的替代品,以降低血脂水平并改善心血管疾病(CVD)结局。特别是对于他汀类药物不耐受的个体。然而,统计能力不足限制了我们对BA疗效和安全性的理解.该荟萃分析利用最新数据提高了我们对BA对脂质和CVD的影响的认识,并增加了统计能力。
    MEDLINE,Embase,CochraneCentral,Clinicaltrials.gov,国家和国际会议的摘要,并搜索了相关研究的参考研究清单。Rayyan被用来筛选搜索结果,采用Revman5.3进行Meta分析和敏感性分析。
    我们的最终分析包括7项随机对照试验(RCT),共有17,782名参与者,BA组(n=9535)为53.6%,安慰剂组(n=8247)为46.4%。BA显著降低主要不良心血管事件(MACE)(OR:0.86;95%CI0.78-0.95;p=0.03),非致死性心肌梗死(OR0.72;95%CI0.61-0.85;p=0.0001),和新发/恶化的糖尿病(OR:0.55;95%CI0.30-0.98,p=0.04),同时将低密度脂蛋白胆固醇(LDL-C)水平降低22.5%(MD:-22.53%;95%CI-25.54至-19.52,p<0.00001)。
    这项荟萃分析的结果表明,BA是他汀类药物治疗的一种有希望且有效的替代药物,特别是他汀类药物不耐受和高CVD风险患者。然而,需要对不同人群进行进一步研究,以量化长期疗效和安全性终点.
    UNASSIGNED: Bempedoic Acid (BA) is a novel drug that has a potential to serve as an alternative to statins to decrease lipid levels and improve cardiovascular disease (CVD) outcomes, particularly for statin-intolerant individuals. However, insufficient statistical power has limited our understanding of the efficacy and safety of BA. This meta-analysis utilizes the latest data to improve our knowledge of BA\'s effects on lipids and CVD with increased statistical power.
    UNASSIGNED: MEDLINE, Embase, Cochrane Central, Clinicaltrials.gov, abstracts of national and international conferences, and reference lists of studies were searched for relevant studies. Rayyan was used to screen the search results, and Revman 5.3 was used for the meta-analysis and sensitivity analysis.
    UNASSIGNED: Our final analysis included seven randomized control trials (RCTs) with 17,782 participants, 53.6 % in the BA group (n = 9535) and 46.4 % in the placebo group (n = 8247). BA significantly decreased major adverse cardiovascular events (MACE) (OR: 0.86; 95 % CI 0.78-0.95; p = 0.03), non-fatal myocardial infarction (OR 0.72; 95 % CI 0.61-0.85; p = 0.0001), and new onset/worsening diabetes (OR:0.55; 95 % CI 0.30-0.98, p = 0.04), while reducing low-density lipoprotein cholesterol (LDL-C) levels by 22.5 % (MD: -22.53 %; 95 % CI -25.54 to -19.52, p < 0.00001).
    UNASSIGNED: The findings of this meta-analysis suggest that BA is a promising and effective alternative to statin therapy, particularly for statin-intolerant and high CVD-risk patients. However, further studies with diverse populations are needed to quantify the long-term efficacy and safety endpoints.
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  • 文章类型: Journal Article
    本研究分析了苯甲酸(BA)对紫苏根际土壤理化性质和微生物群落结构的影响。该分析基于高通量测序技术和生理生化检测。结果表明,随着BA浓度的增加,土壤pH值显著降低,而总氮(TN)的含量,碱性氮(AN),有效磷(AP),速效钾(AK)显著增加。土壤转化酶脲酶和磷酸酶的活性显著增加,但过氧化氢酶和过氧化物酶活性显著下降。这表明BA可以提高土壤酶活性,改善养分转化;BA的添加显着改变了土壤细菌和真菌群落的组成和多样性。有益细菌的相对丰度,如Gemmatimonas,伪装者,根瘤菌显著减少,而有害真菌的相对丰度,如假木曲,假单胞菌,和Talaromyces显著增加。相关分析表明,AP,AN,TN和TN是影响土壤微生物群落结构的主要理化因子。本研究阐明了BA对紫苏土壤理化性质和微生物群落结构的影响,初步揭示了其对紫苏生长的化感作用机制。
    This study analyzed the effects of benzoic acid (BA) on the physicochemical properties and microbial community structure of perilla rhizosphere soil. The analysis was based on high-throughput sequencing technology and physiological and biochemical detection. The results showed that with the increase in BA concentration, soil pH significantly decreased, while the contents of total nitrogen (TN), alkaline nitrogen (AN), available phosphorus (AP), and available potassium (AK) significantly increased. The activities of soil conversion enzymes urease and phosphatase significantly increased, but the activities of catalase and peroxidase significantly decreased. This indicates that BA can increase soil enzyme activity and improve nutrient conversion; the addition of BA significantly altered the composition and diversity of soil bacterial and fungal communities. The relative abundance of beneficial bacteria such as Gemmatimonas, Pseudolabrys, and Bradyrhizobium decreased significantly, while the relative abundance of harmful fungi such as Pseudogymnoascus, Pseudoeurotium, and Talaromyces increased significantly. Correlation analysis shows that AP, AN, and TN are the main physicochemical factors affecting the structure of soil microbial communities. This study elucidates the effects of BA on the physicochemical properties and microbial community structure of perilla soil, and preliminarily reveals the mechanism of its allelopathic effect on the growth of perilla.
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  • 文章类型: Journal Article
    目的:胆道闭锁(BA)是世界上儿童肝硬化和慢性肝功能不全的主要原因。胃食管静脉曲张出血是BA患者肝硬化的不祥并发症,并与高发病率和死亡率相关。在这项研究中,我们的目的是研究无创性BavenoVI和BavenoVII标准在BA患者中筛查静脉曲张需要治疗(VNT)和是否需要肝移植方面的实用性.
    方法:本研究纳入了48例BA患者(23例女性和25例男性),这些患者接受了食管胃十二指肠镜检查(EGD)和瞬时弹性成像检查,平均年龄为11.18±1.48岁;采用回顾性设计对临床数据进行了调查。
    结果:BavenoVI和BavenoVII标准对BA患者VNT的预测的敏感性和阴性预测值均为100%和100%,分别。在我们的队列中,BavenoVI和BavenoVII标准的VNT缺失率均为0%。BavenoVI,扩展的BavenoVI,和BavenoVII标准也预测了我们队列中肝移植的需要(OR=10.33,4.24和21.33;p分别=0.009,0.03和0.007).
    结论:BavenoVI和BavenoVII标准可用于筛查VNT,并最大程度地减少VNT缺失率较低的BA患者的非必需侵入性EGD。BavenoVI,扩展的BavenoVI,和BavenoVII标准与肝移植的需要相关。
    OBJECTIVE: Biliary atresia (BA) is the leading cause of liver cirrhosis and chronic liver insufficiency in children in the world. Gastroesophageal varices bleeding is an ominous complication of cirrhosis in BA patients and is associated with high morbidity and mortality. In this study, we aimed to investigate the utility of noninvasive Baveno VI and Baveno VII criteria for the screening of varices need treatment (VNT) and the need for liver transplantation in BA patients.
    METHODS: This study enrolled 48 BA patients (23 females and 25 males) who underwent an esophagogastroduodenoscopy (EGD) and transient elastography at a mean age of 11.18 ± 1.48 years; the clinical data were surveyed in a retrospective design.
    RESULTS: The sensitivity and negative predictive value of Baveno VI and Baveno VII criteria for the prediction of VNT in BA patients are both 100% and 100%, respectively. The VNT missing rate of Baveno VI and Baveno VII criteria are both 0% in our cohort. The Baveno VI, expanded Baveno VI, and Baveno VII criteria are also predictive of the need for liver transplantation in our cohort (OR = 10.33, 4.24, and 21.33; p = 0.009, 0.03, and 0.007, respectively).
    CONCLUSIONS: The Baveno VI and Baveno VII criteria are useful for the screening of VNT and minimize non-necessary invasive EGD in BA patients with low VNT missing rates. The Baveno VI, expanded Baveno VI, and Baveno VII criteria are associated with the need for liver transplantation.
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  • 文章类型: Journal Article
    背景:肝移植(LT)后胆道闭锁(BA)患儿的生存率显着提高,他们的生活质量备受关注。本研究旨在探讨婴儿原发性活体供者LT(BA-pLDLT)后BA患儿的认知状况及其影响因素。
    方法:重庆医科大学附属儿童医院pLDLT术后6个月(2018-2022年)招募BA患儿。从健康信息系统收集人口统计学和临床数据。使用中文版Griffiths智力发育量表(GMDS-C)评估认知。采用多元线性回归分析认知功能的影响因素。
    结果:总计,57名儿童患有BA-pLDLT,纳入了移植时年龄为5.00(3.90~9.30)个月和评估时年龄为25.00(14.00~60.80)个月的患者.一般发育商(89.02±12.07)和运动,语言,眼手协调,性能,这些儿童的实际推理商明显低于GMDS-C的标准平均值(P<0.05)。57个孩子中,16(28.07%)有临界发育迟缓(DQ在70到84之间),3例(5.26%)发育迟缓(DQ<70),11例(19.29%)出现语言延迟。pLDLT术后胆道或血管并发症的再手术是总体发育商和运动商降低的危险因素,评估时降低ZW与运动商下降有关。
    结论:BA-pLDLT患儿在生命早期有不同程度的发育迟缓。再次手术和营养缺乏对认知发育有不良影响。
    BACKGROUND: The survival rate of children with biliary atresia (BA) after liver transplantation (LT) is significantly improved, and their quality of life has attracted much attention.This study aimed to investigate the cognition and its influencing factors in children with BA after primary living donor LT (BA-pLDLT) during infancy.
    METHODS: Children with BA were recruited 6 months after pLDLT at Children\'s Hospital of Chongqing Medical University (2018-2022). Demographic and clinical data were collected from the health information system. Cognition was assessed using the Chinese version of the Griffiths Mental Development scale (GMDS-C). Multivariate linear regression were used to analyze the influencing factors of their cognitive function.
    RESULTS: In total, 57 children with BA-pLDLT, aged 5.00(3.90-9.30) months at transplantation and 25.00(14.00-60.80) months at evaluation were included. The general developmental quotient (89.02 ± 12.07) and motor, language, eye-hand coordination, performance, and practical reasoning quotients of these children were significantly lower than the normative mean values of GMDS-C(P < 0.05). Of the 57 children, 16 (28.07%) had borderline developmental delay (DQ between 70 and 84), 3 (5.26%) had developmental delay (DQ < 70), and 11(19.29%) had language delay. Reoperation for biliary or vascular complications after pLDLT was a risk factor for decreased general development quotient and motor quotient and lower ZW at assessment was associated with decline motor quotient.
    CONCLUSIONS: Children with BA-pLDLT have varying degrees of developmental delays in early life. Reoperation and nutritional deficiencies had adverse effects on cognitive development.
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  • 文章类型: Journal Article
    村卫生室(VC)是中国三级卫生服务体系的基础,为中国农村公民提供基本和常规的门诊服务。VC技术效率及其趋同在中国农村卫生服务资源配置的政策决策中起着至关重要的作用。
    这项研究测量了VC技术效率(使用基于松弛的测量模型),其收敛性(使用收敛模型),以及影响山西省趋同的因素,中国。数据来自山西省农村卫生研究所2014-2018年卫生统计报告,其中涉及3543家风险投资公司。
    结果表明,VC技术效率较低,并且因地区而异。VC技术效率没有α收敛,但在山西发现了β收敛的证据。影响收敛的主要因素是每个VC(BA)的建筑面积,政府补贴比例(PGS),以及每个VC的总支出与总收入的比率(RTETI)。
    政府应增加对VC的投资,并提高VC的技术效率。同时,政府应意识到并采取措施遏制不同地区之间VC技术效率的不平等,并采取适当措施遏制这种差距。
    UNASSIGNED: Village clinics (VCs) are the foundation of the three-tiered health service system in China, delivering basic and routine outpatient services to citizens in rural China. VC technical efficiency and its convergence play a critical role in policy decisions regarding the distribution of health service resources in rural China.
    UNASSIGNED: This study measured VC technical efficiency (using the slacks-based measure model), its convergence (using the convergence model), and the factors that influence the convergence in Shanxi Province, China. Data were obtained from the Shanxi Rural Health Institute 2014-2018 Health Statistics Report, which involved 3,543 VCs.
    UNASSIGNED: The results showed that VC technical efficiency was low and differed by region. There was no α convergence in VC technical efficiency, but evidence of β convergence was found in Shanxi. The main factors that influence convergence were the building area of each VC (BA), proportion of government subsidies (PGS), and ratio of total expenditure to total income of each VC (RTETI).
    UNASSIGNED: The government should increase investments in VCs and improve VC technical efficiency. Meanwhile, the government should be aware of and take measures to curb the inequity in VC technical efficiency among different regions and take suitable measures to curb this disparity.
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  • 文章类型: Journal Article
    肝星状细胞(HSC)激活和肝纤维化介导的胆道闭锁(BA)发展,但是对潜在的分子机制知之甚少。本研究旨在探讨circRNAhsa_circ_0009096在HSC增殖和肝纤维化中的作用。
    用转化生长因子β(TGF-β1)处理LX-2细胞建立肝纤维化模型。进行RNaseR和放线菌素D测定以检测hsa_circ_0009096稳定性。hsa_circ_0009096,miR-370-3p,并使用逆转录-qPCR检测目标基因。使用双荧光素酶报告基因测定验证hsa_circ_0009096与miR-370-3p的直接结合。使用流式细胞术评估LX-2细胞的细胞周期进程和凋亡。α-平滑肌肌动蛋白(α-SMA),胶原蛋白1A1(COL1A1),使用免疫细胞化学和蛋白质印迹分析LX-2细胞中的TGFβ受体2(TGFBR2)蛋白水平。
    Hsa_circ_0009096对RNaseR和放线菌D消化的抗性高于UTRNmRNA。在TGF-β1处理的LX-2细胞中Hsa_circ_0009096表达显著增加,伴随着α-SMA和COL1A1表达升高。Hsa_circ_0009096siRNA在LX-2细胞中有效促进miR-370-3p并抑制TGFBR2表达,通过hsa_circ_0009096与miR-370-3p的直接缔合介导。Hsa_circ_0009096siRNA干扰细胞周期进程,促进细胞凋亡,TGF-β1处理的LX-2细胞中α-SMA和COL1A1的表达降低。MiR-370-3p抑制剂减轻了细胞周期进程的改变,凋亡,和α-SMA,由hsa_circ_0009096siRNA引起的LX-2细胞中的COL1A1和TGFBR2表达。总之,hsa_circ_0009096通过spongingmiR-370-3p加速TGFBR2表达促进BA发病过程中HSC增殖和肝纤维化。
    UNASSIGNED: Hepatic stellate cell (HSC) activation and hepatic fibrosis mediated biliary atresia (BA) development, but the underlying molecular mechanisms are poorly understood. This study aimed to investigate the roles of circRNA hsa_circ_0009096 in the regulation of HSC proliferation and hepatic fibrosis.
    UNASSIGNED: A cellular hepatic fibrosis model was established by treating LX-2 cells with transforming growth factor β (TGF-β1). RNaseR and actinomycin D assays were performed to detect hsa_circ_0009096 stability. Expression of hsa_circ_0009096, miR-370-3p, and target genes was detected using reverse transcription-qPCR. Direct binding of hsa_circ_0009096 to miR-370-3p was validated using dual luciferase reporter assay. Cell cycle progression and apoptosis of LX-2 cells were assessed using flow cytometry. The alpha-smooth muscle actin (α-SMA), collagen 1A1 (COL1A1), and TGF beta receptor 2 (TGFBR2) protein levels in LX-2 cells were analyzed using immunocytochemistry and western blotting.
    UNASSIGNED: Hsa_circ_0009096 exhibited more resistance to RNase R and actinomycinD digestion than UTRN mRNA. Hsa_circ_0009096 expression increased significantly in LX-2 cells treated with TGF-β1, accompanied by elevated α-SMA and COL1A1 expression. Hsa_circ_0009096 siRNAs effectively promoted miR-370-3p and suppressed TGFBR2 expression in LX-2 cells, mediated by direct association of hsa_circ_0009096 with miR-370-3p. Hsa_circ_0009096 siRNA interfered with the cell cycle progression, promoted apoptosis, and reduced α-SMA and COL1A1 expression in LX-2 cells treated with TGF-β1. MiR-370-3p inhibitors mitigated the alterations in cell cycle progression, apoptosis, and α-SMA, COL1A1, and TGFBR2 expression in LX-2 cells caused by hsa_circ_0009096 siRNA. In conclusion, hsa_circ_0009096 promoted HSC proliferation and hepatic fibrosis during BA pathogenesis by accelerating TGFBR2 expression by sponging miR-370-3p.
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  • 文章类型: Journal Article
    探讨基于CT影像组学的新模型在预测支气管哮喘(BA)患者分期中的价值。
    对2018年至2021年的BA患者进行回顾性分析,并在治疗前进行了胸部CT平扫。根据《BA防治指南》(2016年版),他们分为两组:急性发作和非急性发作。对图像进行如下处理:使用LungKit软件进行图像标准化和分割,利用AK软件进行图像特征提取,并使用R语言进行数据分析和模型构建(训练集:测试集=7:3)。用ROC曲线评价模型的疗效和临床疗效,灵敏度,特异性,校准曲线和判定曲线。
    共纳入112例BA患者,包括80例急性发作患者(范围:2-86岁,平均:53.89±17.306岁,男性33)和32例非急性发作患者(范围:4-79岁,平均:57.38±19.223岁,18岁的男性)。最终保留共10个成像特征,并利用多因素逻辑回归方法构建模型。在训练组中,AUC,模型的敏感性和特异性为0.881(95%CI:0.808-0.955),分别为0.804和0.818;而在测试组中,它是0.792(95%CI:0.608-0.976),分别为0.792和0.80。
    基于影像组学构建的模型对预测BA患者的分期具有良好的效果,为BA患者分期的临床诊断提供了一种新的方法。
    UNASSIGNED: To explore the value of a new model based on CT radiomics in predicting the staging of patients with bronchial asthma (BA).
    UNASSIGNED: Patients with BA from 2018 to 2021 were retrospectively analyzed and underwent plain chest CT before treatment. According to the guidelines for the prevention and treatment of BA (2016 edition), they were divided into two groups: acute attack and non-acute attack. The images were processed as follows: using Lung Kit software for image standardization and segmentation, using AK software for image feature extraction, and using R language for data analysis and model construction (training set: test set = 7: 3). The efficacy and clinical effects of the constructed model were evaluated with ROC curve, sensitivity, specificity, calibration curve and decision curve.
    UNASSIGNED: A total of 112 patients with BA were enrolled, including 80 patients with acute attack (range: 2-86 years old, mean: 53.89±17.306 years old, males of 33) and 32 patients with non-acute attack (range: 4-79 years old, mean: 57.38±19.223 years old, males of 18). A total of 10 imaging features are finally retained and used to construct model using multi-factor logical regression method. In the training group, the AUC, sensitivity and specificity of the model was 0.881 (95% CI:0.808-0.955), 0.804 and 0.818, separately; while in the test group, it was 0.792 (95% CI:0.608-0.976), 0.792 and 0.80, respectively.
    UNASSIGNED: The model constructed based on radiomics has a good effect on predicting the staging of patients with BA, which provides a new method for clinical diagnosis of staging in BA patients.
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  • 文章类型: Journal Article
    脓毒症是一种全身性炎症性疾病,和BrevilinA(BA)具有强大的抗炎作用。然而,BA对脓毒性心肌病是否有类似的作用尚不清楚.本研究旨在探讨BA在脓毒性心肌病中的作用及机制。
    首先,在体外和体内建立了化脓性心肌病模型。心脏损伤标志物的表达,通过实时聚合酶链反应和蛋白质印迹法检测NOD样受体家族pyrin结构域3(NLRP3)炎症因子及其上游调节剂NF-κB。使用超声心动图测量心功能,使用甲基噻唑基四唑盐测定法检测细胞活力。为了进一步研究BA对脓毒性心肌病的影响,使用不同浓度的BA。实验分为对照组,LPS诱导组,LPS+2.5、5.0、10.0μMBA处理组的体外模型,还有Sham,CLP,CLP+10、20、30mg/kgBA医治组的年夜鼠体内模子。最后,心脏损伤,NLRP3炎症,并评估各组的心功能。
    在体外和体内脓毒症心肌病模型中,心脏炎症和损伤基因的mRNA和蛋白表达均显着增加。当不同浓度的BA用于体内和体外脓毒症心肌病时,上述心肌炎症和损伤因素均得到不同程度的抑制,细胞活力增加,心功能改善,老鼠的存活率也提高了。
    BA通过抑制NF-κB/NLRP3炎症激活改善脓毒症心肌病。
    UNASSIGNED: Sepsis is a systemic inflammatory disease, and Brevilin A (BA) has a powerful anti-inflammatory effect. However, whether BA has a similar effect on septic cardiomyopathy remains unclear. This study aimed to investigate the effect and mechanism of BA in septic cardiomyopathy.
    UNASSIGNED: First, a model of septic cardiomyopathy was constructed in vitro and in vivo. The expression of the cardiac injury markers, NOD-like receptor family pyrin domain-containing 3 (NLRP3) inflammation factors and its upstream modulator NF-κB was detected by real-time polymerase chain reaction and western blotting. Cardiac function was measured using echocardiography, cell viability was detected using the methyl thiazolyl tetrazolium assay. To further investigate the effects of BA on septic cardiomyopathy, different concentrations of BA were used. The experiment was divided into control group, LPS induced- group, LPS+2.5, 5.0, 10.0 μM BA treatment group of the vitro model, and the Sham, CLP, CLP+10, 20, 30 mg/kg BA treatment groups of the rat vivo model. Lastly, cardiac injury, NLRP3 inflammation, and cardiac function were assessed in each group.
    UNASSIGNED: The mRNA and protein expression of cardiac inflammation and injury genes were significantly increased in the in vitro and in vivo sepsis cardiomyopathy models. When different concentrations of BA were used in sepsis cardiomyopathy in vivo and in vitro, the above-mentioned myocardial inflammation and injury factors were suppressed to varying degrees, cell viability increased, cardiac function improved, and the survival rate of rats also increased.
    UNASSIGNED: BA ameliorated sepsis cardiomyopathy by inhibiting NF-κB/NLRP3 inflammation activation.
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  • 文章类型: Journal Article
    测定持续生长的生物结构如耳石中的微量元素浓度,胡须,牙齿可以为生理和个体发育过程提供重要的见解。我们检查了11种微量元素的浓度(Li,Mg,Mn,Cu,Zn,Se,Rb,Sr,Cs,Ba,Pb)在66个加拿大东部北极白鲸(Delphinapterusleuas)的牙齿的年度牙本质生长层组(GLGs)中。这些微量元素中的一些在生命早期显示出清晰一致的模式,尽管女性或男性的微量元素数据中几乎没有长期趋势或信号。胎儿牙本质中Sr和Ba浓度的大变化反映在发育中的白鲸牙齿中元素沉积的子宫变化中。在出生后的头几年中,这些元素的显着变化可能与护理和随后的断奶有关。Mg,Mn,和锌在早期生命中也显示出清晰一致的模式,与牙本质稳定氮同位素(δ15N)数据密切相关,提示这些元素值得进一步研究,作为研究护理和断奶的潜在工具。Zn和Pb的沉积模式,与太平洋雌性海象(Odobenusrosmarusdivergens)的性成熟有关,白鲸牙齿不一致。一些个体(包括雄性)显示出与雌性海象中观察到的图案非常相似,而许多动物没有,也许是因为他们还没有达到性成熟。生命最初几年后,微量元素沉积缺乏清晰的模式可能是由于汇集了二十多年来收集的多个种群/地区的样本。但也可能表明元素浓度主要是由其他因素驱动的,生命后期的外在过程,并可能用作环境要素浓度的生物监测者或描绘种群结构的工具。
    Determination of trace element concentrations in continuously growing biological structures such as otoliths, whiskers, and teeth can provide important insight into physiological and ontogenetic processes. We examined concentrations of 11 trace elements (Li, Mg, Mn, Cu, Zn, Se, Rb, Sr, Cs, Ba, Pb) in the annual dentine growth layer groups (GLGs) of teeth of 66 Eastern Canadian Arctic belugas (Delphinapterus leucas). Several of these trace elements displayed clear and consistent patterns in early life, though few longer term trends or signals were present in trace element data for either females or males. Large changes in Sr and Ba concentrations in fetal dentine reflected in utero shifts in element deposition in the teeth of developing belugas. Marked changes in these elements during the first years after birth were likely associated with the onset of nursing and subsequent weaning. Mg, Mn, and Zn also displayed clear and consistent patterns in early life that correlated strongly with dentine stable nitrogen isotope (δ15N) data, suggesting these elements merit further study as potential tools for studying nursing and weaning. Depositional patterns of Zn and Pb, which have been linked to sexual maturation in female Pacific walruses (Odobenus rosmarus divergens), were inconsistent in beluga teeth. Some individuals (including males) displayed patterns strongly resembling those observed in female walruses, whereas many animals did not, perhaps because they had not yet reached sexual maturity. The lack of clear patterns in trace element deposition after the first few years of life may have resulted from pooling samples from multiple populations/regions collected across more than two decades, but may also indicate that elemental concentrations are primarily driven by other, extrinsic processes later in life, and might be useful as biomonitors of environmental element concentrations or tools for delineating population structure.
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