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Properties and Structure of Microcrystalline Chitosan and Hydroxyapatite Composites

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Journal of Biomaterials and Nanobiotechnology 2014年第2期5卷 128-138页

作者： Luciano Pighinelli Magdalena kucharska Institute of Biopolymers and Chemical Fibers—IBWCh Lodz Poland Lutheran University of Brazil (ULBRA) Canoas Brazil

The skeletal system in the human body is very important, provides support and gives shape to the body and provides a network between all soft tissues. The most common problems in hard tissues are bone fractures, defects or diseases which needed to be treated. The developments in artificial bone area seem to solve most of the hard tissue problems, on the other hand artificial bones themselves may cause other problems and in many cases they do not have sufficient mechanical properties and/or good biocompatibility. The importance of chitosan and its derivatives like microcrystalline chitosan has grown significantly over the last two decades due to its renewable and biodegradable source, and also because of the increase in the knowledge of its functionality in the technological and biomedical applications. The excellent biocompability, biofunctionality, and non-antigenic property make the chitosan and its derivatives as a microcrystalline chitosan an ideal material for tissue regeneration. To improve the suitability of chitosan for bone tissue engineering, the composites of MCCh and hydroxyapatite were studied. In the present work the characterization of the MCCh and composites with HAp in form of films and sponges, is based on physico-chemical tests, morphology, structure, particle size of HAp powder and distribution in the polymer matrix. The compositions with film and sponge shape are derived from the junction of two different materials, containing organic and inorganic substances. All sponge preparations, with HAp/MCCh have a well-shaped 3-dimensional structure, which could be used as implants in orthopedic surgery for a scaffolds base for medical applications.

关键词： Chitosan Microcrystalline Chitosan Hydroxyapatite Functional Biopolymer Tissue Engineering

Properties of Microcrystalline Chitosan-Calcium Phosphate Complex Composite

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Journal of Biomaterials and Nanobiotechnology 2013年第4期4卷 20-29页

作者： Luciano Pighinelli Magdalena kucharska Lutheran University of Brazil (ULBRA) Canoas Brazil Institute of Biopolymers and Chemical Fibers—IBWCh Lodz Poland Lutheran University of Brazil (ULBRA) Canoas Brazil Institute of Biopolymers and Chemical Fibers—IBWCh Lodz Poland

Nature itself uses materials like, cellulose to provide the structure of plants, chitin as the exoskeleton of several insects and molluscs, collagen for mechanical support in connective tissues and so on. At present, the socioeconomic situation of the modern world has raised the interest in renewable materials being used in regenerative medicine. The composition of MCCh/?-TCP complex in sponge shape is derived from the junction of two or more different materials, containing organic and inorganic materials, including bioactivity and biodegradability as a characteristic. The chemical characteristics of MCCh/?-TCP complex composites showed that both of the components organic and inorganic exist in the material. All sponge preparations, with MCCh/?-TCP have a well-shaped 3-dimentional structure, a highly porous and interconnected and homogenous pore structure to ensure a biological environment conducive to cell attachment and proliferation as well as tissue growth, providing the passage of nutrient flow. These materials can be used in future for medical applications as a base for scaffolds production and as implants in regenerative medicine.

关键词： Microcrystalline Chitosan Calcium Phosphate Functional Biopolymer Medical Applications

Behavioural and Neurophysiological Effects of a Stroke Rehabilitation Program on Emotional Processing in Tuberothalamic Infarct—Case Study

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Journal of Behavioral and Brain Science 2016年第1期6卷 42-52页

作者： Katarzyna kucharska Ewelina Wilkos Roman Stefanski Grzegorz Makowicz Danuta Ryglewicz Ksenia Slawinska Ewa Piatkowska-Janko Institute of Psychiatry and Neurology Warsaw Poland Institute of Radioelectronics and Multimedia Technlogy Warsaw University of Technology Warsaw Poland

The aim of the study was to assess the neurophysiological and behavioural effects of a stroke rehabilitation involving Treatment As Usual (TAU) combined with Social Cognitive Training (SCT) in a right-handed patient suffered from tuberothalamic infarct compared to healthy controls (HCs) (n = 13). Methods: Both HCs and the patient were assessed by means of the following measures: Penn Emotion Perception Battery (ER40, EmoDiff40, PEAT40, PFMT), Reading the Mind in the Eyes Test, and Toronto Alexithymia Scale alongside clinical scales (Mini Mental State Examination, The State-Trait Anxiety Inventory, and Hamilton Depression Scale). The SCT was delivered individually for 60 minutes weekly in a 12-week program (12 sessions). The subject participated twice in a fMRI scanning session including the event-related task of implicit processing of 100% fearful expressions to detect physiological changes after TAU plus SCT and compared them with HCS who underwent the same assessment once. Results: Compared with HCs, the patient before therapy revealed lower scores in emotion recognition;particularly perception of anger was affected alongside worse performance on both emotion discrimination and acuity tests. After therapy, B.D. showed improvement in emotional processing. B.D. had less post-therapy activation maps compared with pretherapy ones and more significantly activated pre-and post-central gyrus and right cerebellum in response to fearful faces. Interestingly, no amygdala was significantly activated as the response to fearful stimuli before or after therapy was completed. Conclusions: Further research was needed to increase understanding about efficacy of SCT and the theory of neuroplasticity, thus helping rehabilitation programs.

关键词： Emotional Deficits Thalamic Stroke Social Cognitive Training fMRI Changes

青年急性心肌梗死住院患者的20年趋势及性别差异

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中华预防医学杂志 2020年第1期54卷 103-103页

作者： Arora S Stouffer GA kucharska-Newton AM 王德征(编译) 不详天津市疾病预防控制中心非传染病预防与控制室

老年人发生急性心肌梗死(AMI)存在性别差异已众所周知。但青年AMI发生率和相关危险因素在性别分布上是否存在差异的研究却很少。Arora等在美国4个社区开展的动脉粥样硬化风险(ARIC)研究,对AMI入院情况进行监测并分类评估。其研究人群为3... 详细信息

老年人发生急性心肌梗死(AMI)存在性别差异已众所周知。但青年AMI发生率和相关危险因素在性别分布上是否存在差异的研究却很少。Arora等在美国4个社区开展的动脉粥样硬化风险(ARIC)研究,对AMI入院情况进行监测并分类评估。其研究人群为35至54岁年轻患者,并从患者病历中提取诊疗信息。结果显示:1995至2014年,共抽取了28732份加权AMI住院患者,其中8737人(30%)是年轻人。年轻AMI入院患者总体比例从1995—1999年的27%上升到2010—2014年的32%(P=0.002),其中年轻女性的增幅最大。在年轻AMI患者中,有高血压病史的比例从59%上升至73%(P<0.001),有糖尿病病史的比例从25%上升至35%(P<0.001)。与年轻男性相比,发生急性心肌梗死的年轻女性多为黑人,并且有更大的共病负担。年轻女性接受基于指南治疗的概率更低,包括降脂、非阿司匹林抗血小板治疗、β受体阻滞剂治疗、冠状动脉造影和冠状动脉血管重建。研究提示,需要更好地了解这些性别差异的潜在因素,以改善对年轻AMI患者的护理。

关键词：冠状动脉血管年轻男性入院患者入院情况冠状动脉造影年轻女性动脉粥样硬化分类评估