Biomaterials, medical devices, and artificial organs最新文献_第3页

Blood-cellulosics interactions. Blood-cellulosics交互。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118836

T J Sinha, P Vasudevan

引用次数: 11

Surface--interface energy contributions to blood compatibility. 表面-界面能量有助于血液相容性。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118832

C P Sharma

引用次数: 4

The effect of aging and surface modification on the mechanical properties of dense aluminum oxide. 时效和表面改性对致密氧化铝力学性能的影响。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118822

S D Cook, L A Weinberg

引用次数: 1

Blood-material interaction. Blood-material交互。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118827

N Jayakumari

引用次数: 10

Adhesion in the biologic environment. 粘附在生物环境中。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118830

R E Baier

{"title":"Adhesion in the biologic environment.","authors":"R E Baier","doi":"10.3109/10731198409118830","DOIUrl":"https://doi.org/10.3109/10731198409118830","url":null,"abstract":"There are good reasons to believe that adhesion of particulate matter in all wet, salty, biochemically active circumstances follows a common pattern, and that such adhesion can be effectively controlled by adjusting the surface properties - especially surface energy--of the substrate involved. One of the most compelling proofs of, at least, the bioengineering utility of surface energy modification to maximize or minimize biological adhesion is the successful, now long-term, implantation of total artificial hearts. These pumps, and the related intra-aortic balloons and left ventricular assist devices, do not accumulate blood clots or thrombotic masses during their contact with natural blood. Since surfaces contacting blood have received most careful scrutiny for more than a decade, the instruction gained from examining the usual and unusual sequelae of blood cell adhesion to nonphysiologic surfaces has been most valuable in revealing the general features of biological adhesion in other, less well-studied, circumstances. The initial events of blood contact with foreign solid surfaces are briefly reviewed, and the impressive similarities of these events to sequences in oceanic fouling of heat exchangers, cell culture experiments and dental plaque formation are highlighted. A unifying concept, based on control of the surface free energy through an empirical correlate called the \"critical surface tension,\" is presented as an explanation for the common features of biological adhesion in all of Nature's domains.","PeriodicalId":75597,"journal":{"name":"Biomaterials, medical devices, and artificial organs","volume":"12 3-4","pages":"133-59"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/10731198409118830","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17458580","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 24

Dynamic loading of dental amalgam and effects upon electrochemistry and microstructure. 牙用汞合金的动态载荷及其对电化学和微观结构的影响。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118823

H J Mueller

{"title":"Dynamic loading of dental amalgam and effects upon electrochemistry and microstructure.","authors":"H J Mueller","doi":"10.3109/10731198409118823","DOIUrl":"https://doi.org/10.3109/10731198409118823","url":null,"abstract":"The stress vs. cycles (S-N) behavior for four amalgams is reported. At 10 cycles/min and for 37 degrees C air and artificial saliva environments, linear regression lines fit the data with high correlations between 10(2) and 10(4) cycles. Significance at 50% exists between the environments and with saliva decreasing failure resistance. The open circuit potential (OCP), the OCP-time transients at constant anodic currents, and the cyclic voltammetry all exhibit changes with loading. With static loading the OCP decreases, while with dynamic loading the OCP exhibits a sinusoidal pattern and a pattern with two maxima and two minima after the loading has progressed and which continues up until failure. The maximum anodic current in voltammetry increases with continual potential cycling (or load cycling), while decreases when performed without loading. The application of anodic currents to the amalgams has, however, not significantly reduced the number of cycles to failure, nor has the application of cathodic currents increased the number of cycles. Rearrangement and coalesence of voids takes place with loading and with microcracking forming preferentially between them. Crack propagation occurs predominantly within the gamma-1 matrix.","PeriodicalId":75597,"journal":{"name":"Biomaterials, medical devices, and artificial organs","volume":"12 1-2","pages":"75-93"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/10731198409118823","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17589013","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Surface laboratory: its essentials and fundamentals. 表面实验室:其要领和基础。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118828

R E Baier

引用次数: 3

The surface free energy of human dental enamel. 人类牙釉质的表面自由能。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118820

H J Busscher, H P de Jong, A W van Pelt, J Arends

{"title":"The surface free energy of human dental enamel.","authors":"H J Busscher, H P de Jong, A W van Pelt, J Arends","doi":"10.3109/10731198409118820","DOIUrl":"https://doi.org/10.3109/10731198409118820","url":null,"abstract":"The surface free energy is a definite factor in the adhesion of micro-organisms to host surfaces, such as tooth surfaces. The surface free energy gamma s can experimentally be determined by means of a series of contact angle measurements with various liquids. Employing the concept of polar and dispersion components, it was found, that gamma s of ground and polished human enamel is 88 +/- 9 erg.cm-2. This value is of the same order of magnitude as obtained for hydroxyapatite (the main mineral component of enamel) and fluorapatite. Fluoride applications on human enamel, frequently employed in dentistry, greatly influence the surface free energy. Application of various fluorides gave different results: Aminfluorides reduced gamma s to 62 +/- 5 erg.cm-2; APF raised gamma s to 107 +/- 11 erg.cm-2; NaF hardly influenced gamma s X gamma s remained 87 +/- 9 erg.cm-2. Adsorption of salivary proteins (pellicle formation) influences these differences. In vivo pellicle formation on FEP (gamma s = 17 erg.cm-2) increased gamma s to 41 erg.cm-2, Diacryl (gamma s = 76 erg.cm-2) increased gamma s to 117 erg.cm-2, while on sintered hydroxyapatite (gamma s = 80 erg.cm-2) gamma s increased to 118 erg.cm-2.","PeriodicalId":75597,"journal":{"name":"Biomaterials, medical devices, and artificial organs","volume":"12 1-2","pages":"37-49"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/10731198409118820","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17589128","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 12

Protein interaction: concepts from thermodynamic measurements. 蛋白质相互作用:热力学测量的概念。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118837

M Jamaluddin, L Kalliyanakrishnan

{"title":"Protein interaction: concepts from thermodynamic measurements.","authors":"M Jamaluddin, L Kalliyanakrishnan","doi":"10.3109/10731198409118837","DOIUrl":"https://doi.org/10.3109/10731198409118837","url":null,"abstract":"Proteins are biological molecules par excellence. They have evolved as elements of structure, catalysis and control. The conflict between the requirement of structural stability and the requirement of functional specificity and efficiency, under varying environmental conditions in which they are often called upon to function, has been evolutionarily solved by a process of thermodynamic compensation. In the simplest form of thermodynamic compensation the Gibb's free energy change (delta G) of a process occurring under different environmental conditions is kept constant (linear compensation) or allowed to vary slightly (non linear compensation) by compensating a large change in enthalpy (delta H) by an equally (or nearly 80) large change in entropy, delta S. In processes like protein adsorption to surfaces the number of various types of interactions involved is so large that compensatory or augmenting changes in the same type of thermodynamic parameter may occur and complicate the picture. Published data do, however, suggested the occurrence of thermodynamic compensation in protein adsorption. It is pointed out that the simultaneous measurement of two thermodynamic parameters, namely, enthalpy change (delta H), and heat capacity change (delta Cp), under appropriate conditions could often lead to an understanding of the dominant types of forces involved in adsorption.","PeriodicalId":75597,"journal":{"name":"Biomaterials, medical devices, and artificial organs","volume":"12 3-4","pages":"289-306"},"PeriodicalIF":0.0,"publicationDate":"1984-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.3109/10731198409118837","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"17594250","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 4

Surface modification of polycarbonate with synthetic polyelectrolyte-anticoagulant activity. 合成聚电解质对聚碳酸酯的表面改性-抗凝血活性。

Biomaterials, medical devices, and artificial organs Pub Date : 1984-01-01 DOI: 10.3109/10731198409118833

C P Sharma, T Chandy, A Latha

引用次数: 5