modification

修改
  • 文章类型: Journal Article
    金属有机骨架(MOFs)是一种新型的固体结晶多孔功能材料。作为无机多孔材料的延伸,它在准备和应用方面取得了重要进展。MOFs广泛应用于气体吸附储存等各个领域,药物输送,传感,和生物成像由于它们的高比表面积,孔隙度,可调孔径,丰富的活性位点,和通过引入基团进行功能修饰。在本文中,MOF的类型被分类,综述了MOFs材料的合成方法和功能改性机理。最后,讨论了金属有机骨架材料在生物医学领域的应用前景和面临的挑战,希望促进其在多学科领域的应用。
    Metal-organic frameworks (MOFs) are a new variety of solid crystalline porous functional materials. As an extension of inorganic porous materials, it has made important progress in preparation and application. MOFs are widely used in various fields such as gas adsorption storage, drug delivery, sensing, and biological imaging due to their high specific surface area, porosity, adjustable pore size, abundant active sites, and functional modification by introducing groups. In this paper, the types of MOFs are classified, and the synthesis methods and functional modification mechanisms of MOFs materials are summarized. Finally, the application prospects and challenges of metal-organic framework materials in the biomedical field are discussed, hoping to promote their application in multidisciplinary fields.
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  • 文章类型: Journal Article
    Sturmdorf型缝合线传统上用于在冷刀锥切术后获得止血。在本文和随附的视频中,我们对Sturmdorf缝线进行了简化修改,以进一步降低术后出血和宫颈狭窄的风险.我们改良的Sturmdorf缝合线本质上是一个大的水平八字缝合线,同时对前唇和后唇的粘膜进行小咬伤,并绘制宫颈粘膜以覆盖裸露的宫颈残端。这种修改的优点是:(1)手术简单,只需一次缝合即可完成;(2)通过将子宫颈外侧的子宫动脉降支的子宫颈分支合并到缝合环中来实现出色的止血;(3)在打结时,单缝合技术在子宫颈上提供了更合适的张力,并从六个对称方向将宫颈粘膜拉向宫颈管,均匀分布的张力有助于恢复宫颈残端的优选圆柱形;(4)八字缝合线的交点位于宫颈管,当缝合环收紧时,组织经历最小的变形,因此宫颈狭窄是罕见的。
    The Sturmdorf type sutures are traditionally used for obtaining hemostasis after a cold knife conization. In this article and accompanying video, we provided a simplified modification of the Sturmdorf suture to further reduce the risk of postoperative bleeding and cervical stenosis. Our modified Sturmdorf suture is essentially a large horizontal figure-of-eight suture, with simultaneous small bites on the mucosa of the anterior and posterior lips drawing the cervical mucosa to cover the denuded cervical stump. The advantages of this modification are: (1) The surgery is simple, accomplished with only one suture; (2) excellent hemostasis is achieved by incorporating the cervical branch of the descending rami of the uterine artery lateral to the cervix in the suture loop; (3) the single-suture technique provides more appropriate tension on the cervix when tying the knot and pulls the cervical mucosa towards the cervical canal from six symmetrical directions, evenly distributed tension helps restore the preferable cylindrical shape of the cervical stump; and (4) the intersection point of the figure-of-eight suture is located in the cervical canal, where the tissue undergoes minimal deformation when the suture loop is tightened, therefore stenosis of the uterine cervix is rare.
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  • 文章类型: Journal Article
    反应性羰基物质由于其亲电子性质而可以在摄入时修饰消化酶。这项研究评估了甲基乙二醛(MGO)的作用,乙二醛,丙烯醛,和转化酶上的甲醛,一种酶存在于消化道中。出乎意料的是,MGO增强,而不是抑制,转化酶活性。此外,MGO抵消了其他三种羰基化合物对转化酶活性的抑制作用。动力学分析显示150mmolLexp。-1MGO导致Km增加2倍,Vmax增加3.3倍,表明MGO增加了蔗糖的周转率,同时降低了转化酶的底物结合亲和力。此外,MGO诱导的动态荧光猝灭,减少游离氨基,增加疏水性,Amadori产品的含量,荧光和非荧光AGEs,和转化酶的淀粉样纤维。导致MGO对转化酶活性升高的特定修饰需要进一步研究。
    Reactive carbonyl species can modify digestive enzymes upon intake due to their electrophilic nature. This study evaluated the effects of methylglyoxal (MGO), glyoxal, acrolein, and formaldehyde on invertase, an enzyme presents in digestive tract. Unexpectedly, MGO enhanced, rather than inhibited, invertase activity. Moreover, MGO counteracted the inhibitory effects of the other three carbonyls on invertase activity. Kinetic analyses revealed that 150 mmolLexp.-1 MGO resulted in a 2-fold increase in the Km and a 3.3-fold increase in Vmax, indicating that MGO increased the turnover rate of sucrose while reducing the substrate binding affinity of invertase. Additionally, MGO induced dynamic quenching of fluorescence, reduced free amino groups, increased hydrophobicity, the content of Amadori products, fluorescent and nonfluorescent AGEs, and amyloid fibrils of invertase. The specific modifications responsible for the elevated activity of MGO on invertase require further investigation.
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  • 文章类型: Journal Article
    通过辛烯基琥珀酸酐(OSA)改性同步制备的酯化淀粉(ES)和颗粒酯化预糊化淀粉(EPS)的形成条件和功能特性差异尚不清楚。在这项研究中,探讨了OSA改性后ES和EPS的形成条件和理化性质。改性温度控制了OSA改性过程中两种淀粉的形成量和时间。与ES相比,每股收益表现出更高的替代度,冷水膨胀力,在冷水中的吸水能力和表观粘度。结构表征证实ES和EPS的分子量和短/长程分子有序性降低。此外,扫描电镜显示EPS保持其颗粒状形态。X射线衍射图证实了EPS中形成的淀粉-脂质复合物比ES中存在更多。这项研究提供了一种制备酯化和颗粒酯化预糊化淀粉的新方法,这些淀粉可用作低能量配方食品中的有前途的添加剂。
    The formation conditions and functional property differences of esterified starch (ES) and granular esterified-pregelatinized starch (EPS) synchronously prepared by octenyl succinic anhydride (OSA) modification remain unclear. In this study, we explored the formation conditions and physicochemical properties of ES and EPS after OSA modification. The modification temperature controlled the formation amount and time for both starch types during OSA modification. Compared to ES, EPS exhibited a higher degree of substitution, cold-water swelling power, water-absorption capacity and apparent viscosity in cold water. The structural characterization confirmed the molecular weight and short/long-range molecular order of ES and EPS decreased. Moreover, scanning electron microscopy indicated EPS retained its granular morphology. The X-ray diffraction patterns confirmed the presence of more starch-lipid complexes formed in EPS than in ES. This study provides a novel method for preparing esterified and granularly esterified-pregelatinized starches that could be used as promising additives in low-energy formula foods.
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  • 文章类型: Journal Article
    近年来,治疗性蛋白质药物的批准激增,特别是重组糖蛋白。果蝇S2细胞由于其在细胞培养中的简单性和低成本而成为生产重组蛋白的有吸引力的平台。然而,与使用S2细胞表达系统相关的一个显著限制是它倾向于引入简单的paucimannosidic糖基化结构,这与哺乳动物表达系统不同。众所周知,糖蛋白的糖基化模式对其理化性质有深远的影响,生物活性,和免疫原性。因此,理解这些糖基化修饰背后的机制并实施解决该问题的措施已成为相当感兴趣的主题。本文旨在全面总结近年来S2细胞糖基化修饰的研究进展。特别关注比较S2和其他昆虫细胞之间的糖基化模式,和哺乳动物细胞,以及开发改变重组糖蛋白糖基化模式的策略。
    In recent years, there has been a remarkable surge in the approval of therapeutic protein drugs, particularly recombinant glycoproteins. Drosophila melanogaster S2 cells have become an appealing platform for the production of recombinant proteins due to their simplicity and low cost in cell culture. However, a significant limitation associated with using the S2 cell expression system is its propensity to introduce simple paucimannosidic glycosylation structures, which differs from that in the mammalian expression system. It is well established that the glycosylation patterns of glycoproteins have a profound impact on the physicochemical properties, bioactivity, and immunogenicity. Therefore, understanding the mechanisms behind these glycosylation modifications and implementing measures to address it has become a subject of considerable interest. This review aims to comprehensively summarize recent advancements in glycosylation modification in S2 cells, with a particular focus on comparing the glycosylation patterns among S2, other insect cells, and mammalian cells, as well as developing strategies for altering the glycosylation patterns of recombinant glycoproteins.
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  • 文章类型: Journal Article
    牙科医生对植入物支持的氧化锆-钛基(Zi-Ti)基修复体的断裂强度感兴趣,无论是否改变宫颈粘膜下轮廓。将80个氧化锆样品调整到Ti基上。一类由经过修改的标本组成。其他类别包括未经修改的基台。在子宫颈区域的Zi-Ti基部界面处进行了抛光和直肠探伤。使用通用测试装置,以牛顿(N)为每个类别中的每个样品评估抗断裂性。改性台的断裂强度在4465.79-6523.50N之间,平均值为5604.24±497.62N。断裂强度值在5511.42-7064.33N之间变化,在没有修改的基台中,平均断裂强度值为6265.95±331.61。观察到,经过改性的基台的断裂强度较小。
    The fracture strength of implant supported zirconia-titanium base (Zi-Ti) base restorations with and without modification of submucosal cervical contour is of interest to dentists. 80 zirconia specimens were adjusted onto the Ti-base. One category consisted of specimens that underwent modification. Other category consisted of abutments without modification. There was polishing and recon touring at the interface of Zi-Ti base in cervical regions. Using the universal testing apparatus fracture resistance was assessed for every sample in every category in Newtons (N). The fracture strength of abutments with modification ranged between 4465.79 - 6523.50 N with mean value of 5604.24 ± 497.62 N. On the other hand, values of fracture strength varied between 5511.42 - 7064.33 N. in abutments without modification with mean fracture strength values of 6265.95 ± 331.61. It was observed that the fracture strength was lesser in abutments that underwent modification.
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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
    植物生长,产量,和分布受到非生物胁迫的显著影响,影响全球生态系统和林业实践。然而,植物已经进化出由许多基因和转录因子(TFs)控制的复杂适应机制来管理这些胁迫。其中,bZIP(碱性亮氨酸拉链)是协调形态适应的关键调节器。这篇综述旨在阐明bZIPTFs在植物物种中的多方面作用。我们讨论了应激刺激引起的形态变化以及bZIPTFs在介导这些反应中的关键作用。虽然一些出版物已经探索了bZIPTFs响应非生物胁迫的机制,这篇评论深入探讨了错综复杂的监管网络,总结选择性剪接和翻译后修饰,与bZIPTF交互的信令网络,和bZIPTFs的基因工程。通过综合目前的研究,这篇综述提供了关于bZIP与其他蛋白质相互作用以调节应激如寒冷,热,干旱,和盐。此外,它为bZIPTFs的未来研究和应用提供了途径,以通过基因工程提高植物的非生物胁迫恢复力。
    Plant growth, yield, and distribution are significantly impacted by abiotic stresses, affecting global ecosystems and forestry practices. However, plants have evolved complex adaptation mechanisms governed by numerous genes and transcription factors (TFs) to manage these stresses. Among these, bZIP (basic leucine zipper) is a crucial regulator orchestrating morphological adaptations. This review aims to elucidate the multifaceted roles of bZIP TFs in plant species. We discuss the morphological changes induced by stress stimuli and the pivotal functions of bZIP TFs in mediating these responses. While several publications have explored the mechanisms of bZIP TFs in response to abiotic stresses, this review delves into the intricate regulatory networks, summarizing alternative splicing and post-translational modifications, signaling networks interacting with bZIP TFs, and genetic engineering of bZIP TFs. By synthesizing current research, this review provides an updated discussion on bZIP interactions with other proteins to regulate stresses such as cold, heat, drought, and salt. Additionally, it offers avenues for future research and applications of bZIP TFs to improve abiotic stress resilience in plants through genetic engineering.
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  • 文章类型: Journal Article
    近年来,纳米纤维素(NC)由于其卓越的性能而获得了广泛的关注,如可调节的表面化学,非凡的生物学特性,低毒性和低密度。本文综述了木质纤维素生物质(LCB)来源的NC的制备,包括纤维素纳米纤丝(CNF),纤维素纳米晶体(CNC),和含木质素的纤维素纳米原纤维(LCNF)。它侧重于检查非纤维素组分如木质素和半纤维素对NC功能的影响。此外,讨论了数控加工的各种表面改性策略,包括酯化,醚化和甲硅烷基化。该评论还强调了NC在Pickering乳液等领域的应用进展,食品包装材料,食品添加剂,和水凝胶。最后,研究了用LCB生产NC的前景及其在食品相关领域的应用。这项工作旨在证明从木质纤维素生物质制备NC的有效益处及其在食品工业中的潜在应用。
    In recent years, nanocellulose (NC) has gained significant attention due to its remarkable properties, such as adjustable surface chemistry, extraordinary biological properties, low toxicity and low density. This review summarizes the preparation of NC derived from lignocellulosic biomass (LCB), including cellulose nanofibrils (CNF), cellulose nanocrystals (CNC), and lignin-containing cellulose nanofibrils (LCNF). It focuses on examining the impact of non-cellulosic components such as lignin and hemicellulose on the functionality of NC. Additionally, various surface modification strategies of NC were discussed, including esterification, etherification and silylation. The review also emphasizes the progress of NC application in areas such as Pickering emulsions, food packaging materials, food additives, and hydrogels. Finally, the prospects for producing NC from LCB and its application in food-related fields are examined. This work aims to demonstrate the effective benefits of preparing NC from lignocellulosic biomass and its potential application in the food industry.
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  • 不健康的生活方式导致精神不健康和生活质量差,是各种生活方式障碍的主要决定因素。目的是1)审查与改变生活方式以促进心理健康有关的工作,以及2)提出有关改变生活方式以促进心理健康和福祉的建议。
    从科学文献中检索了关于改变生活方式以促进心理健康的工作,并进行了批判性审查。
    提出了关于“为心理健康和福祉而改变生活方式”的建议。包括健康生活方式的20个具体组成部分是:常规,时间管理,祈祷,基本活动,读报纸,学习/工作,锻炼,娱乐/放松/人才提升,教育,认知活动,社交网络,行为准则,对等组,社会群体,婚姻/家庭,生活技能,身体健康,健康教育,移动使用,数字媒体。生活方式改变一揽子计划是全面的,旨在促进心理健康和福祉。
    UNASSIGNED: Unhealthy life-style leads to mental ill-health and poor quality of life and is the major determinant of a wide range of lifestyle disorders. The aim was to 1) review the work relating to life style modification for promoting mental health and 2) Present recommendations on life-style modification for mental health and wellbeing.
    UNASSIGNED: The work on life style changes for promotion of mental health was retrieved from the scientific literature and critically reviewed.
    UNASSIGNED: Recommendations on \'Life-style modification for mental health and wellbeing\' are presented. 20 specific components of healthy life style included are: Routine, time management, prayer, basic activities, reading newspaper, study/work, exercise, recreation/ relaxation/ talent promotion, education, cognitive activities, social networking, guidelines for behavior, peer group, social group, marriage/family, life skills, physical health, health education, mobile use, and digital media. The lifestyle modification package is comprehensive and geared to promote mental health and well-being.
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