separation

分离
  • 文章类型: Journal Article
    越来越多的证据表明,精神和情绪健康与肠道微生物群之间存在关系。关于微生物群对狗反复发生的急性应激事件的反应知之甚少。以及它是否是应激反应的预测因子。在这项研究中,我们探讨了对肠道微生物群和消化系统健康的影响,这两个常见事件许多宠物狗感到压力。二十只健康的成年狗,生活在一个殖民地,在八周的间隔中暴露于汽车旅行或分离中三次。粪便样本收集24小时前,在24小时内,和24-48小时后。粪便质量和pH值,在更广泛的已发表的有关生理应激措施的工作背景下,对微生物群多样性和组成进行了分析。在任何时间点,粪便质量或pH值均未出现明显变化,表明所有宠物保持良好的消化健康。微生物群分析表明,两种应激源对α或β多样性均无重大影响。在这些狗中没有鉴定出先前与应激相关的微生物特征,并且在功能性肠道组成中没有观察到变化。无论宠物是否被认为是“强调”(即,表现出血清皮质醇的增加),对微生物群没有影响,没有分类群可以预测应激反应。总的来说,这项工作表明,对于这个人口来说,某些急性应激事件对犬肠道菌群没有有意义的影响,它对相关的应激反应没有影响。
    There is growing evidence that a relationship exists between mental and emotional wellbeing and the gut microbiota. Little is known regarding how the microbiota reacts to repeated acute stress events in dogs, and whether it is a predictor of stress response. In this study, we explored the impact on the gut microbiota and digestive health with two common events many pet dogs find stressful. Twenty healthy adult dogs, living within a colony, were exposed to either car travel or separation three times across eight-week intervals. Faecal samples were collected 24 h before, within 24 h, and 24-48 h after. Faecal quality and pH, and microbiota diversity and composition were analysed in context with wider published work on physiological stress measures. No significant changes were observed in faecal quality or pH with either stress event at any timepoint, indicating all pets remained in good digestive health. Microbiota analysis demonstrated no significant impact on alpha or beta diversity with either stressor. Microbial signatures previously linked to stress were not identified in these dogs and no changes were observed in the functional gut composition. Irrespective of whether the pet was considered \"stressed\" (i.e., exhibited an increase in serum cortisol), there was no effect on the microbiota and no taxa were predictive of stress response. Collectively, this work demonstrates, for this population, certain acute stress events have no meaningful impact on the canine gut microbiota, and it has no impact on the associated stress response.
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  • 文章类型: Journal Article
    介孔二氧化硅SBA-15由于其独特的结构和物理化学性质,已成为一种有前途的吸附和分离材料。为了进一步提高其性能,各种表面改性策略,包括金属氧化物和贵金属的掺入,以改善催化活性和稳定性,用氨基和巯基进行有机官能化,以增强吸附能力和选择性,和无机-有机复合改性的协同效应,进行了广泛的探索。本文综述了SBA-15用于吸附和分离应用的表面改性的最新进展。合成方法,结构特性,并讨论了SBA-15的优点,然后详细分析了不同的改性策略及其结构-性能关系。功能化SBA-15材料在有机污染物去除中的吸附分离性能,重金属离子,气体,和生物分子,以及在色谱和固液分离中,进行批判性评估。尽管取得了重大进展,确定了未来研究的挑战和机遇,包括开发低成本和可持续的合成路线,合理设计具有定制性能的SBA-15基材料,并融入实际应用。这篇综述旨在指导未来的研究工作,以开发用于可持续环境和工业应用的先进SBA-15基材料。强调绿色和可扩展的修改策略。
    Mesoporous silica SBA-15 has emerged as a promising adsorbent and separation material due to its unique structural and physicochemical properties. To further enhance its performance, various surface modification strategies, including metal oxide and noble metal incorporation for improved catalytic activity and stability, organic functionalization with amino and thiol groups for enhanced adsorption capacity and selectivity, and inorganic-organic composite modification for synergistic effects, have been extensively explored. This review provides a comprehensive overview of the recent advances in the surface modification of SBA-15 for adsorption and separation applications. The synthesis methods, structural properties, and advantages of SBA-15 are discussed, followed by a detailed analysis of the different modification strategies and their structure-performance relationships. The adsorption and separation performance of functionalized SBA-15 materials in the removal of organic pollutants, heavy metal ions, gases, and biomolecules, as well as in chromatographic and solid-liquid separation, is critically evaluated. Despite the significant progress, challenges and opportunities for future research are identified, including the development of low-cost and sustainable synthesis routes, rational design of SBA-15-based materials with tailored properties, and integration into practical applications. This review aims to guide future research efforts in developing advanced SBA-15-based materials for sustainable environmental and industrial applications, with an emphasis on green and scalable modification strategies.
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  • 文章类型: Journal Article
    在2023年,世界卫生组织(WHO)发表了关于袋鼠母亲护理(KMC)的全球立场文件,这适用于全世界所有国家:从出生的那一刻起,每个“小而病”的新生儿都应与母亲保持直接和持续的皮肤与皮肤接触(SSC),在那个地方接受所有需要的临床护理。这是由2021年发表的一项随机对照试验的惊人结果引起的:其中,将1,609名接受即时SSC的婴儿与1,602名与母亲分开但接受相同的常规最新护理的对照进行了比较。干预婴儿在28天后死亡率降低了25%。
    新的WHO指南是对早期指南和常见临床实践的重大改变。作者认为,将母亲和婴儿分开被认为是“正常”(一种范例),但实际上使新生儿的发病率和死亡率增加。作者提出了关于“正常”的新观点的论点和伦理观点,“让新生儿与母亲在一起是婴儿的生理期望和健康发展的关键要求。作者回顾了改变范式的科学原理,基于催产素对母亲和婴儿的同步相互作用。这是对新政策的批评,强调了即时南南合作的作用。
    这一批评加强了实施世卫组织关于小婴儿和患病婴儿的KMC指南的理由。在产科和新生儿环境中都需要进行系统更改,以确保无缝的围产期护理。基于催产素的作用,作者指出,许多当前的常规护理实践实际上可能会导致压力和增加新生儿的脆弱性。世卫组织就新生儿重症监护病房的家庭参与和存在提出了可行的建议。
    复原力和脆弱性的概念在围产期护理中具有众所周知的特定定义:护理的关键结果应该是复原力,而不仅仅是缺乏脆弱性。在所有环境和背景下的新生儿都需要我们重新评估我们的范式,并采用和实施新的WHO围产期护理KMC指南。
    UNASSIGNED: In 2023, the World Health Organization (WHO) published a Global Position Paper on Kangaroo Mother Care (KMC), which is applicable to all countries worldwide: from the moment of birth, every \"small and sick\" newborn should remain with mother in immediate and continuous skin-to-skin contact (SSC), receiving all required clinical care in that place. This was prompted by the startling results of a randomized controlled trial published in 2021: in which 1,609 infants receiving immediate SSC were compared with 1,602 controls that were separated from their mothers but otherwise received identical conventional state-of-the-art care. The intervention infants showed a 25% reduction in mortality after 28 days.
    UNASSIGNED: The new WHO guidelines are a significant change from earlier guidance and common clinical practice. The author presents that separating mothers and babies is assumed to be \"normal\" (a paradigm) but actually puts newborns at increased risk for morbidity and mortality. The author presents arguments and ethical perspectives for a new perspective on what is \"normal,\" keeping newborns with their mothers is the infant\'s physiological expectation and critical requirement for healthy development. The author reviews the scientific rationale for changing the paradigm, based on synchronous interactions of oxytocin on both mother and infant. This follows a critique of the new policies that highlights the role of immediate SSC.
    UNASSIGNED: This critique strengthens the case for implementing the WHO guidelines on KMC for small and sick babies. System changes will be necessary in both obstetric and neonatal settings to ensure seamless perinatal care. Based on the role of oxytocin, the author identifies that many current routine care practices may actually contribute to stress and increased vulnerability to the newborn. WHO has actionable recommendations about family involvement and presence in newborn intensive care units.
    UNASSIGNED: The concepts of resilience and vulnerability have specific definitions well known in perinatal care: the key outcome of care should be resilience rather than merely the absence of vulnerability. Newborns in all settings and contexts need us to re-evaluate our paradigms and adopt and implement the new WHO guidelines on KMC in perinatal care.
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  • 文章类型: Journal Article
    这项研究的重点是使用一种新的基于电的膜方法(称为过滤膜电渗析(EDFM))对胰岛素样生长因子I(IGF-I)和转化生长因子-β2(TGF-β2)进行分馏。在EDFM之前,测试了不同的预处理,在EDFM期间使用四种pH条件(4.25、3.85、3.45和3.05)。已证明,用去离子水对脱脂初乳进行1:1稀释以降低矿物质含量,然后用UF预浓缩GFs是必要的,并允许这些化合物在EDFM过程中迁移到回收室。MS分析证实了迁移,数量少,在EDFM期间,只有α-乳白蛋白(α-la)和β-乳球蛋白(β-lg)从血清型到恢复室。因此,在pH值为3.05时,回收室中GFs与总蛋白的比例比饲料血清型溶液高60倍,最佳pH有利于IGF-I和TGF-β2的迁移。最后,在酸乳清上测试了这些最佳条件,以证明所提出的工艺对干酪工业主要副产品之一的可行性;回收室中GFs与总蛋白的比率比饲料酸乳清溶液高2.7倍,只有α-la迁移。首次提出了结合超滤和电渗析技术对不同乳制品溶液进行GF富集的技术。
    This study is focused on fractionation of insulin-like growth factor I (IGF-I) and transforming growth factor-β2 (TGF-β2) using a new electro-based membrane process calledelectrodialysis with filtration membranes (EDFM). Before EDFM, different pretreatments were tested, and four pH conditions (4.25, 3.85, 3.45, and 3.05) were used during EDFM. It was demonstrated that a 1:1 dilution of defatted colostrum with deionized water to decrease mineral content followed by the preconcentration of GFs by UF is necessary and allow for these compounds to migrate to the recovery compartment during EDFM. MS analyses confirmed the migration, in low quantity, of only α-lactalbumin (α-la) and β-lactoglobulin (β-lg) from serocolostrum to the recovery compartment during EDFM. Consequently, the ratio of GFs to total protein in recovery compartment compared to that of feed serocolostrum solution was 60× higher at pH value 3.05, the optimal pH favoring the migration of IGF-I and TGF-β2. Finally, these optimal conditions were tested on acid whey to also demonstrate the feasibility of the proposed process on one of the main by-products of the cheese industry; the ratio of GFs to total protein was 2.7× higher in recovery compartment than in feed acid whey solution, and only α-la migrated. The technology of GF enrichment for different dairy solutions by combining ultrafiltration and electrodialysis technologies was proposed for the first time.
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  • 文章类型: Journal Article
    要分析婚姻结局,离婚或分居,以及它与人口统计的联系,社会经济,诊断2年后乳腺癌(BC)幸存者的临床病理因素。
    我们对参与AMAZONAIII(GBECAM0115)研究的年龄≥18岁诊断为侵袭性BC的女性进行了基线和随访第1年和第2年的婚姻状况回顾性分析。BC诊断发生在2016年1月至2018年3月之间,在巴西的23个机构中。
    在参加AMAZONAIII的2974名女性中,599人在基线时已婚或生活在普通法下。在随访2年时,35例(5.8%)患者发生了离婚或分居。在多变量分析中,公共健康保险覆盖率与较高的婚姻状况变化风险相关(8.25%与2.79%,RR3.09,95%CI1.39-7.03,p=0.007)。做了乳房切除术的女性,腺样体切除术或保留皮肤的乳房切除术与离婚或分居的风险较高(8.1%vs.4.49%,RR1.97,95CI1.04-3.72,p=0.0366)比接受保乳手术的患者高。
    公共卫生系统覆盖的妇女和接受乳房切除术的妇女,乳腺腺切除术或保留皮肤的乳房切除术与较高的离婚或分居风险相关。这一证据进一步支持了长期婚姻稳定与社会经济条件和压力源之间复杂的相互作用有关的观点。如BC的诊断和治疗。临床试验注册:NCT02663973。
    UNASSIGNED: To analyze marital outcomes, divorce or separation, and its association with demographic, socioeconomic, and clinicopathological factors among breast cancer (BC) survivors after 2-years of diagnosis.
    UNASSIGNED: We performed a retrospective analysis of marital status at baseline and at years 1 and 2 of follow-up of women aged ≥ 18 years diagnosed with invasive BC participating in the AMAZONA III (GBECAM0115) study. The BC diagnosis occurred between January 2016 and March 2018 at 23 institutions in Brazil.
    UNASSIGNED: Of the 2974 women enrolled in AMAZONA III, 599 were married or living under common law at baseline. Divorce or separation occurred in 35 (5.8%) patients at 2 years of follow-up. In the multivariate analysis, public health insurance coverage was associated with a higher risk of marital status change (8.25% vs. 2.79%, RR 3.09, 95% CI 1.39 - 7.03, p = 0.007). Women who underwent mastectomy, adenomastectomy or skin-sparing mastectomy were associated with a higher risk of divorce or separation (8.1% vs. 4.49%, RR 1.97, 95 CI 1.04 - 3.72, p = 0.0366) than those who underwent breast-conserving surgery.
    UNASSIGNED: Women covered by the public health system and those who underwent mastectomy, adenomastectomy or skin-sparing mastectomy were associated with a higher risk of divorce or separation. This evidence further supports the idea that long-term marital stability is associated with a complex interplay between socioeconomic conditions and stressors, such as BC diagnosis and treatment. ClinicalTrials Registration: NCT02663973.
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  • 文章类型: Editorial
    暂无摘要。
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  • 文章类型: Journal Article
    背景:在临床研究的二元分类中,案例到类的不平衡分布以及二元因变量和独立变量子集之间的极端关联水平可能会产生重大的分类问题。这些关键问题,即阶级不平衡和完全分离,导致临床研究中分类不准确和结果有偏差。
    方法:为了处理类不平衡和完成分离问题,我们建议使用模糊逻辑回归框架进行二元分类。模糊逻辑回归结合了系数的三角模糊数的组合,输入,并输出并产生清晰的分类结果。由于模糊逻辑对不平衡和分离问题的更好处理,模糊逻辑回归框架显示出强大的分类性能。因此,提高了分类精度,降低临床研究患者的错误分类条件和偏颇见解的风险。
    结果:在具有临床数据集的十二个二元分类问题上评估了模糊逻辑回归模型的性能。该模型具有一贯的高灵敏度,特异性,F1,精度,和所有临床数据集的Mathew相关系数得分。没有证据表明数据集中存在的不平衡或分离会产生影响。此外,我们将模糊逻辑回归分类性能与经典逻辑回归的两个版本和文献中的六个不同的基准来源进行比较。这六个来源总共提供了十种不同的拟议方法,并且通过计算每种方法的相同分类性能分数集来进行比较。不平衡或分离会影响十分之七的方法。其余三个在各自的临床研究中产生更好的分类性能。然而,这些都优于模糊逻辑回归框架。
    结论:模糊逻辑回归显示了对不平衡和分离的强大表现,提供准确的预测,因此,在临床研究中对患者进行分类的信息见解。
    BACKGROUND: In binary classification for clinical studies, an imbalanced distribution of cases to classes and an extreme association level between the binary dependent variable and a subset of independent variables can create significant classification problems. These crucial issues, namely class imbalance and complete separation, lead to classification inaccuracy and biased results in clinical studies.
    METHODS: To deal with class imbalance and complete separation problems, we propose using a fuzzy logistic regression framework for binary classification. Fuzzy logistic regression incorporates combinations of triangular fuzzy numbers for the coefficients, inputs, and outputs and produces crisp classification results. The fuzzy logistic regression framework shows strong classification performance due to fuzzy logic\'s better handling of imbalance and separation issues. Hence, classification accuracy is improved, mitigating the risk of misclassified conditions and biased insights for clinical study patients.
    RESULTS: The performance of the fuzzy logistic regression model is assessed on twelve binary classification problems with clinical datasets. The model has consistently high sensitivity, specificity, F1, precision, and Mathew\'s correlation coefficient scores across all clinical datasets. There is no evidence of impact from the imbalance or separation that exists in the datasets. Furthermore, we compare the fuzzy logistic regression classification performance against two versions of classical logistic regression and six different benchmark sources in the literature. These six sources provide a total of ten different proposed methodologies, and the comparison occurs by calculating the same set of classification performance scores for each method. Either imbalance or separation impacts seven out of ten methodologies. The remaining three produce better classification performance in their respective clinical studies. However, these are all outperformed by the fuzzy logistic regression framework.
    CONCLUSIONS: Fuzzy logistic regression showcases strong performance against imbalance and separation, providing accurate predictions and, hence, informative insights for classifying patients in clinical studies.
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  • 文章类型: Journal Article
    现代科学在重矿物应用方面的最新进展,工程,几十年来,技术和冶金工业特别是核能和电力工业的需求显着增加。这是重矿物产品的关键性和商业化的原因,也需要工业对其的高需求。重质矿物的回收,例如:来自其矿床的Zr和Ti伴生矿物依赖于来自复杂矿物的过渡金属和难熔金属的提取冶金。根据矿物浓缩和金属提取的有效性和效率,在他们的恢复过程中遇到了一些挑战,特别是在它们与相关的矿物杂质或脉石的分离中。然而,这篇综述的重点是研究磁性和静电物理处理技术及其在重矿物选矿和回收中的应用。因此,这将是,作为减少工艺步骤和提取复杂性的工具,涉及到溶解和湿法冶金过程的下游措施的矿物。
    Recent advancements in the applications of heavy minerals by modern science, engineering, technological and metallurgical industries especially in the demand by nuclear and power industries have significantly increased over the decades. This is the reason for the criticality and commerciality of products of heavy minerals and also necessitated their high demand by industries. The recovery of heavy minerals, such as: Zr and Ti associated minerals from their deposits is dependent on extractive metallurgy of transition and refractory metals from complex minerals. Based on the effectiveness and efficiency of mineral concentration as well as metal extraction, several challenges have been encountered in their recovery process, especially in their separation from associated mineral impurities or gangue. This review is however focused on investigating magnetic and electrostatic physical processing techniques and their applications in the beneficiation and recovery of heavy minerals. This will therefore, serve as a tool in reducing process steps and extraction complexity involved in downstream measures of dissolution and hydrometallurgical processes of the minerals.
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  • 文章类型: Journal Article
    由于它们的化学相似性,相邻稀土元素(REE)的分离是具有挑战性的问题。我们已经使用四种类型的吸附剂研究了相邻REE的分离,这些吸附剂由用二甘醇酰胺酸改性的硅胶组成,在酰胺位置具有不同的官能团。对于所有的吸附剂,稀土元素的吸附率随着La到Sm原子序数的增加而增加,然后对于重稀土元素变得恒定。其中,EDASiDGA,含有仲酰胺和叔酰胺的吸附剂,显示Nd/Pr的高分离因子为2.8。对EDASiDGA填充柱进行了Pr的单独回收测试,Nd,还有Sm.在这些稀土元素从0.10MHCl中吸附后,用0.32和1.0MHCl进行解吸试验。因此,Pr和Nd分别用0.32MHCl洗脱,用1.0MHCl回收Sm。由于EDASiDGA填充柱显示出优异的分离Pr/Nd/Sm没有任何螯合剂,很有实际应用前景。
    The separation of adjacent rare earth elements (REEs) is a challenging issue due to their chemical similarity. We have investigated the separation of adjacent REEs using four types of adsorbents consisting of silica gel modified with diglycolamic acid with different functional groups at the amide position. For all the adsorbents, the adsorption ratio of REEs increased with the increase in atomic number from La to Sm and then became constant for heavy REEs. Among them, EDASiDGA, an adsorbent containing secondary and tertiary amides, showed a high separation factor for Nd/Pr of 2.8. The EDASiDGA-packed column was tested for individual recovery of Pr, Nd, and Sm. After the adsorption of these REEs from 0.10 M HCl, desorption tests were performed with 0.32 and 1.0 M HCl. As a result, Pr and Nd were eluted separately with 0.32 M HCl, and Sm was recovered with 1.0 M HCl. Since the EDASiDGA-packed column showed excellent separation of Pr/Nd/Sm without any chelating agent, it is promising for practical use.
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  • 文章类型: Journal Article
    系统研究了β-葡萄糖寡糖在活性炭上的吸附特性和纯化方法。在最佳条件下,活性炭的最大吸附容量达到0.419g/g。吸附行为被描述为单层,自发的,基于几个模型的拟合结果和放热。通过梯度乙醇洗脱获得了5个具有不同聚合度(DP)和结构的β-葡萄糖寡糖级分。图10E主要含有具有dp2a(G1→6G)和dp2b(G1→3G)的二糖。20E具有具有dp3a(G1→6G1→3G)和dp3b(G1→3G1→3G)的三糖。30E主要由dp3a和dp4a组成(G1→3G1→3(G1→6)G),dp4b(G1→6G1→3G1→3G),和dp4c(G1→3G1→3G1→3G)。除了四糖,40E和50E还含有具有β-(1→3)-连接或β-(1→6)-连接的葡萄糖残基的五糖和六糖。所有组分均可抑制H2O2诱导的Caco-2细胞内活性氧(ROS)的积累,它们可以通过增加超氧化物歧化酶(SOD)和还原型谷胱甘肽(GSH)的活性来改善氧化应激损伤,与它们的DP和结构有关。具有高DP的50E显示出更好的抗氧化应激活性。
    The adsorption characteristics of β-glucooligosaccharides on activated carbon and the purification were systematically investigated. The maximum adsorption capacity of activated carbon reached 0.419 g/g in the optimal conditions. The adsorption behavior was described to be monolayer, spontaneous, and exothermic based on several models\' fitting results. Five fractions with different degrees of polymerization (DPs) and structures of β-glucooligosaccharides were obtained by gradient ethanol elution. 10E mainly contained disaccharides with dp2a (G1→6G) and dp2b (G1→3G). 20E possessed trisaccharides with dp3a (G1→6G1→3G) and dp3b (G1→3G1→3G). 30E mainly consisted of dp3a and dp4a (G1→3G1→3(G1→6)G), dp4b (G1→6G1→3G1→3G), and dp4c (G1→3G1→3G1→3G). In addition to tetrasaccharides, 40E and 50E also contained pentasaccharides and hexasaccharides with β-(1→3)-linked or β-(1→6)-linked glucose residues. All fractions could inhibit the accumulation of intracellular reactive oxygen species (ROS) in H2O2-induced Caco-2 cells, and they could improve oxidative stress damage by increasing the activity of superoxide dismutase (SOD) and reduced glutathione (GSH), which were related to their DPs and structures. 50E with high DPs showed better anti-oxidative stress activity.
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