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Data Analytics on Chronic Kidney Disease Data 慢性肾脏疾病数据分析
Pub Date : 2018-02-07 DOI: 10.2139/ssrn.3200432
J. Sarada, Neelam Venugopal Muthu Lakshmi
Data Analytics plays a vital role in making decisions in various fields since it provides useful information from large database with varying set of fields. This paper presents the procedure to know the occurrence of chronic kidney disease (CKD) at early stage in advance. CKD is a type of kidney disease due to which kidney functionality decreased over a period of months or years. Data analytics is performed on Chronic Kidney Diseases dataset and the outcomes are analysed. R language is used to find the results and these generated rules are useful to predict the symptoms that lead to CKD.
数据分析在各个领域的决策中起着至关重要的作用,因为它从具有不同领域集的大型数据库中提供有用的信息。本文介绍了早期了解慢性肾脏疾病(CKD)发生的方法。CKD是一种肾脏疾病,由于肾脏功能在几个月或几年的时间内下降。对慢性肾脏疾病数据集进行数据分析,并对结果进行分析。使用R语言查找结果,这些生成的规则对于预测导致CKD的症状非常有用。
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引用次数: 1
Coordination-Responsive Drug Release inside Gold Nanorod@MOF for NIR-Induced Synergistic Chemo-Photothermal Therapy nir诱导的协同化学-光热疗法的协同反应-金内药物释放Nanorod@MOF
Pub Date : 2018-01-01 DOI: 10.2139/ssrn.3151999
Yantao Li, Jun Jin, Dawei Wang, Jiawei Lv, Ke Hou, Yaling Liu, Chunying Chen, Z. Tang
Multifunctional core-shell nanostructures by integration of distinct components have received wide attention as a promising biological platform in recent years. In this work, the crystalline zeolitic imidazolate framework-8 (ZIF-8), a typical metal-organic framework (MOF), is coated onto single gold nanorod (AuNR) core for successful realization of synergistic photothermal and chemotherapy triggered by near-infrared (NIR) light. Impressively, the high doxorubicin hydrochloride (DOX) loading capacity followed by pH and NIR light dual stimuli-responsive DOX release can be easily implemented through formation and breakage of coordination bonds in the system. Moreover, under 808 nm NIR laser irradiation, these novel core-shell NP@MOF nanostructures exhibit effective chemo-photothermal synergistic therapy both in vitro and in vivo, confirmed by both cell treatment and tumor ablation via intravenous injection.
近年来,由不同组分集成而成的多功能核壳纳米结构作为一种有前景的生物平台受到了广泛关注。本研究将典型的金属有机骨架(MOF)——结晶沸石咪唑酸骨架-8 (ZIF-8)包覆在单金纳米棒(AuNR)核心上,成功实现了近红外(NIR)光引发的协同光热和化疗。令人印象深刻的是,通过系统中配位键的形成和断裂,可以很容易地实现高盐酸阿霉素(DOX)负载能力以及pH和近红外光双刺激响应的DOX释放。此外,在808 nm近红外激光照射下,这些新型核壳NP@MOF纳米结构在体外和体内均表现出有效的化学-光热协同治疗作用,并通过细胞治疗和静脉注射肿瘤消融得到证实。
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引用次数: 0
Nano-Diamond Hybrid Materials for Structural Biomedical Application 纳米金刚石杂化材料在生物医学结构中的应用
Pub Date : 2017-03-09 DOI: 10.3844/AJBBSP.2017.34.41
R. Aversa, R. Petrescu, A. Apicella, F. Petrescu
The development of new diamond based bio-mechanically active hybrid nano-structured scaffolds for cartilage cells tissue engineering are proposed in this study. Innovative tissue engineering biomimetic materials based on hydrogel have shown attractive physical, biological and mechanical properties in several biomedical applications. A highly biocompatible novel hybrid material based on nanodiamonds and hydrophilic poly-(hydroxyl-ethyl-methacrylate) (pHEMA) is proposed. The aim of this paper is to describe the chemical and analytical procedures for the preparation of nanofilled hybrid composites possessing biomimetic, osteoconductive and osteoinductivity properties that can be useful in the design of bio-mechanically active innovative bone scaffolding systems for stem cell differentiation and growth. A more rigid and rubber transparent hybrid nano-composites are predicted to posses improved mechanical strength overwhelming one of the major weaknesses of hydrogels, which is due their poor mechanical characteristics, for applications in biomedical structural application.
本研究提出了用于软骨细胞组织工程的新型金刚石基生物机械活性杂化纳米结构支架的开发。基于水凝胶的创新型组织工程仿生材料在多种生物医学应用中显示出诱人的物理、生物和机械性能。提出了一种基于纳米金刚石和亲水聚甲基丙烯酸羟乙基(pHEMA)的高生物相容性新型杂化材料。本文的目的是描述制备具有仿生、骨传导和骨诱导特性的纳米填充混合复合材料的化学和分析方法,这些复合材料可用于设计用于干细胞分化和生长的生物机械活性创新骨支架系统。一种更刚性和橡胶透明的杂化纳米复合材料预计具有更高的机械强度,克服了水凝胶的主要缺点之一,即其机械特性较差,可用于生物医学结构应用。
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引用次数: 125
Effective Concurrent Engineering with the Usage of Genetic Algorithms for Software Development 在软件开发中使用遗传算法的有效并行工程
Pub Date : 2012-09-30 DOI: 10.5121/IJSEA.2012.3507
D. Sundar, Dr. K. Alagarsamy
Software specifications are useful to the organizations to enforce a consistent approach in designing, implementing and the maintenance of the software. There are numerous principles employed for the assurance of the quality of the software. Concurrent engineering with Genetic algorithms have been adopted for the software development. The results obtained are appreciable and detailed discussion is done.
软件规范对于组织在设计、实现和维护软件时强制采用一致的方法是有用的。有许多原则被用来保证软件的质量。软件开发采用了并行工程和遗传算法。所得结果令人满意,并作了详细的讨论。
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引用次数: 0
Hydrogel Mechanics Influence Growth and Development of Embedded Brain Organoids 水凝胶力学对嵌入式脑类器官生长发育的影响
Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3883355
Camille S. Cassel de Camps, Saba Aslani, Nicholas Stylianesis, Harris Nami, Nguyen-Vi Mohamed, T. Durcan, C. Moraes
Brain organoids are three-dimensional, tissue-engineered neural models derived from induced pluripotent stem cells that enable studies of neurodevelopmental and disease processes. Mechanical properties of the microenvironment are known to be critical parameters in tissue engineering, but the mechanical consequences of the encapsulating matrix on brain organoid growth and development remain undefined. Here, Matrigel® was modified with an interpenetrating network (IPN) of alginate, to tune the mechanical properties of the encapsulating matrix. Brain organoid grown in IPNs were viable, with characteristic formation of neuroepithelial buds. However, organoid growth was significantly restricted in the stiffest matrix tested. Moreover, stiffer matrices skewed cell populations towards mature neuronal phenotypes; with fewer and smaller neural rosettes. These findings demonstrate that mechanics of the culture environment are important parameters in brain organoid development, and show that the self-organizing capacity and subsequent architecture of brain organoids can be modulated by forces arising from growth-induced compression of the surrounding matrix. This study therefore suggests that carefully designing the mechanical properties of organoid encapsulation materials is a potential strategy to direct organoid growth and maturation towards desired structures.
脑类器官是由诱导多能干细胞衍生的三维组织工程神经模型,可用于神经发育和疾病过程的研究。众所周知,微环境的机械特性是组织工程中的关键参数,但封装基质对脑类器官生长和发育的机械影响仍不明确。在这里,用海藻酸盐的互穿网络(IPN)修饰Matrigel®,以调整封装矩阵的机械性能。在ipn中生长的脑类器官是可存活的,具有特征性的神经上皮芽形成。然而,在最硬的基质中,类器官的生长明显受到限制。此外,较硬的基质使细胞群向成熟的神经元表型倾斜;神经结越来越少,越来越小。这些发现表明,培养环境的机制是脑类器官发育的重要参数,并表明脑类器官的自组织能力和后续结构可以通过生长诱导的周围基质压缩产生的力来调节。因此,这项研究表明,仔细设计类器官封装材料的机械性能是指导类器官生长和成熟的潜在策略。
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引用次数: 13
Alternative Co-Initiators for Photocurable Biomaterials: Polymerisation, Quantum Yield of Conversion and Cytotoxicity 光固化生物材料的可选共引发剂:聚合、转化量子产率和细胞毒性
Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3878356
A. Hamidi, M. Hadis, W. Palin
Cyclic acetals such as 1,3 benzodioxole (BZD), piperonyl alcohol (PA), and N-phenyl glycine (NPG) are naturally occurring compounds capable of acting as co-initiators during free-radical polymerisation, and potentially serve to offer non-allergic and biologically less toxic alternatives to conventional (tertiary) amines. The current study aimed to evaluate the use of cyclic acetals in concentrations of 0.5-6.0 mol % for photopolymerisation of an unfilled model dimethacrylate resin system, bisphenol-A-glycidyldimethacrylate (BisGMA), and triethylene glycol dimethacrylate (tegDMA), 1:1 wt.%) using the photosensitiser camphorquinone (CQ; λmax = 469 nm) in concentrations of 0.5-1.5 mol %. Conventional tertiary amines, namely, ethyl-4-dimethyamino benzoate (EDMAB) (aromatic) and dimethylaminoethyl methacrylate (DMAEMA) (aliphatic) were utilised for comparison purposes. Real-time degree of conversion (DC) was evaluated using Fourier transform near-infrared spectroscopy. To measure the effectiveness of these alternative compounds in facilitating CQ photon absorption, quantum yield of conversion of CQ per absorbed photon was calculated using UV-Vis spectroscopy. Cytotoxicity of NPG and cyclic acetals were assessed using MTT and Calcien AM to determine metabolic activity and cell viability, respectively. The result indicated that cyclic acetals were capable of facilitating free radical polymerisation as co-initiators at all three CQ concentrations (0.5, 1.0 and 1.5 mol %). Further, the use of NPG as a co-initiator resulted in post-irradiation DC values that were comparable to both EDMAB and DMAEMA across all three CQ concentrations. Based on the quantum yield of conversion of CQ, alternative compounds facilitated the hydrogen abstraction process, which provided high conversion of CQ molecules. UV-Vis absorption and quantum yield data revealed that NPG exhibited competitive effects in absorbing blue light photons, which might be attributed to the photolytic degradation of NPG and the formation of N-methylaniline. Indirect treatment of human dental pulp cells (HDPCs) with eluted extracts of NPG, BZD and PA exhibited relatively lower cytotoxicity when compared with HDPCs groups treated with no eluted extracts. The relative cytotoxicity of DMAEMA was comparable to that of PA. However EDMAB, CQ and the neat model resin media extracts resulted in significant cytotoxicity, with highest relative reduction in the number of viable cells observed in groups treated with neat model resin extracts, suggesting that bisGMA and tegDMA monomers played significant role in the overall cytotoxicity of photocurable systems involving HDPCs.
环缩醛,如1,3苯二唑(BZD)、辣椒醇(PA)和n-苯基甘氨酸(NPG)是天然存在的化合物,能够在自由基聚合过程中作为共引发剂,并有可能提供传统(叔)胺的非过敏性和生物毒性较小的替代品。目前的研究旨在评估使用浓度为0.5-6.0 mol %的环缩醛光聚合未填充的二甲丙烯酸酯模型树脂体系,双酚- a -缩水甘油酯(BisGMA)和三甘醇二甲基丙烯酸酯(tegDMA), 1:1 wt.%),使用光敏剂樟脑醌(CQ;λmax = 469 nm),浓度为0.5-1.5 mol %。常规叔胺,即乙基-4-二甲氨基苯甲酸乙酯(EDMAB)(芳香)和二甲氨基甲基丙烯酸乙酯(DMAEMA)(脂肪)被用于比较目的。利用傅里叶变换近红外光谱技术对实时转换度(DC)进行了评价。为了测量这些替代化合物促进CQ光子吸收的有效性,利用紫外可见光谱计算了每吸收光子转换CQ的量子产率。采用MTT法和钙离子AM法测定NPG和环缩醛的细胞毒性,测定代谢活性和细胞活力。结果表明,在所有三种CQ浓度(0.5、1.0和1.5 mol %)下,环缩醛都能作为共引发剂促进自由基聚合。此外,在所有三种CQ浓度下,NPG作为共引发剂的使用导致辐照后DC值与EDMAB和DMAEMA相当。基于CQ转化的量子产率,替代化合物促进了氢的提取过程,提供了CQ分子的高转化率。紫外可见吸收和量子产率数据表明,NPG在吸收蓝光光子方面表现出竞争效应,这可能与NPG的光解降解和n -甲基苯胺的形成有关。NPG、BZD和PA洗脱提取物间接处理人牙髓细胞(HDPCs)的细胞毒性较未洗脱提取物处理的HDPCs组明显降低。DMAEMA的相对细胞毒性与PA相当。然而,EDMAB、CQ和纯模型树脂介质提取物导致了显著的细胞毒性,在纯模型树脂提取物处理组中观察到的活细胞数量的相对减少幅度最大,这表明bisGMA和tegDMA单体在涉及HDPCs的光固化系统的整体细胞毒性中起着重要作用。
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引用次数: 0
Subcutaneous Surgical Rat Models for the Evaluation of Tissue-Engineered Heart Valve Immunogenicity: A Systematic Review 组织工程心脏瓣膜免疫原性评价的皮下手术大鼠模型:系统综述
Pub Date : 1900-01-01 DOI: 10.2139/ssrn.3935488
Steve Waqanivavalagi, M. Ground, Consuelo Alarcon, P. Milsom, J. Cornish
Background: Tissue engineered heart valves are being designed as alternative valvular conduits to standard bioprostheses with the potential to meet the requirements of an ideal valvular prosthesis: non-thrombogenicity, non-immunogenicity, long-lasting, and capability of growth, repair, and remodelling upon implantation. Assessments of immunogenicity are required before in vivo testing in large animals may be undertaken. Rats are a cost-effective model that are widely used for such assessments. However, it is unclear whether the surgical rat models used for examining tissue immunogenicity are homogenous in their design. Methods: Systematic searches were conducted in the PubMed, Scopus, and Web of Science databases for articles in which the immunogenicity of tissue engineered heart valves was examined using subcutaneous surgical rat models. Assessments were made of the animal, surgical, and donor scaffold characteristics used in such models. The heterogeneity of the various characteristics was then evaluated qualitatively. Results: In total, 54 articles were qualitatively assessed in this systematic review. The donor scaffold characteristics were homogenous. Whereas, the animal and surgical characteristics were heterogenous and infrequently reported. The collective data suggest that an agreed subcutaneous rat model might consist of implanting four, 1 cm2, tissue engineered heart valve samples in the dorsal aspect of 6-week-old, Sprague Dawley, rats. Conclusions: Rat subcutaneous implantation may be undertaken to assess the immunogenicity of tissue engineered heart valves before proceeding to in vivo studies in large animal models. There is significant heterogeneity in the characteristics of the subcutaneous rat models that have been used, to date. Most studies insufficiently report the techniques used. Funding Information: This work was supported by funding gratefully received from the Green Lane Research and Education Fund (Greenlane Research and Education Fund, Grafton, Auckland, New Zealand), and the National Heart Foundation of New Zealand (National Heart Foundation of New Zealand, Ellerslie, Auckland, New Zealand). S.W. received a postgraduate scholarship from the National Heart Foundation of New Zealand, M.G. received and Green Lane Research and Education Fund Postgraduate Scholarship, and C.A. received a University of Auckland summer research scholarship. Declaration of Interests: The authors declare that they have no conflicts of interest related to this work.
背景:组织工程心脏瓣膜被设计为标准生物假体的替代瓣膜导管,具有满足理想瓣膜假体要求的潜力:非血栓性,非免疫原性,持久耐用,植入后具有生长,修复和重塑能力。在进行大型动物体内试验之前,需要对免疫原性进行评估。大鼠是广泛用于此类评估的具有成本效益的模型。然而,目前尚不清楚用于检查组织免疫原性的手术大鼠模型在设计上是否同质。方法:系统检索PubMed、Scopus和Web of Science数据库中有关组织工程心脏瓣膜免疫原性的文章,这些文章使用皮下手术大鼠模型进行了研究。评估了这些模型中使用的动物、手术和供体支架的特性。然后对各种特征的异质性进行定性评价。结果:本系统综述共对54篇文献进行了定性评价。供体支架的特征是均匀的。然而,动物和手术特征是异质的,很少报道。这些数据表明,一个公认的皮下大鼠模型可能包括在6周龄的Sprague Dawley大鼠的背部植入4个1平方厘米的组织工程心脏瓣膜样本。结论:大鼠皮下植入可用于评估组织工程心脏瓣膜的免疫原性,然后再进行大型动物模型的体内研究。迄今为止,已使用的皮下大鼠模型的特征存在显著的异质性。大多数研究没有充分报道所使用的技术。资助信息:本研究由Green Lane研究与教育基金(Greenlane研究与教育基金,Grafton, Auckland, New Zealand)和National Heart Foundation of New Zealand (National Heart Foundation of New Zealand, Ellerslie, Auckland, New Zealand)资助。S.W.获得了新西兰国家心脏基金会研究生奖学金,M.G.获得了绿巷研究与教育基金研究生奖学金,C.A.获得了奥克兰大学夏季研究奖学金。利益声明:作者声明与本研究没有任何利益冲突。
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