Abstract:
:Crowding can substantially affect the transition of a protein between its native (N) and unfolded (U) states via volume exclusion effects. Also, it influences considerably the aggregation (A) of unfolded proteins. To examine the details, we developed an approach for computing the kinetic rates of the process N <--> U --> A in which the concentration of the protein is explicitly taken into account. We then compute the relative change with temperature of the protein denaturation for various fractional volume occupancies and partition of proteins in solution. The analysis indicates that, in protein solutions in which the average distance between proteins is comparable with the radius of gyration of an unfolded protein, steric effects increase the stability of the proteins which are in compact, native states. In heterogeneous protein solutions containing various types of proteins with different thermal stabilities, the unfolding of the most thermolabile proteins will increase the stability of the other proteins. The results shed light on the way proteins change the thermal stability of a cell as they unfold and aggregate. This study may be valuable in questions related to the dynamics of thermal injuries.
journal_name
Ann Biomed Engjournal_title
Annals of biomedical engineeringauthors
Despa F,Orgill DP,Lee RCdoi
10.1007/s10439-005-5780-8subject
Has Abstractpub_date
2005-08-01 00:00:00pages
1125-31issue
8eissn
0090-6964issn
1573-9686journal_volume
33pub_type
杂志文章abstract::A multifunctional FePt nanoparticle was developed that targets tumor microvasculature via "radiation-guided" peptides, and is detected by both near-infrared (NIR) fluorescence imaging and analytical mass spectrometry methods. Tumor specific binding was first measured by biotinylated peptide linked to fluorophore-conju...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-010-0219-8
更新日期:2011-03-01 00:00:00
abstract::The pupil diameter (PD), controlled by the autonomic nervous system, seems to provide a strong indication of affective arousal, as found by previous research, but it has not been investigated fully yet. In this study, new approaches based on monitoring and processing the PD signal for off-line and on-line "relaxation"...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-013-0880-9
更新日期:2014-01-01 00:00:00
abstract::Intramuscular pressure (IMP) shows promise for estimating individual muscle tension in vivo. However, previous pressure measurements show high variability during isometric contraction and poor correlation with tension during dynamic contraction. We hypothesized that enhanced sensor anchoring/orientation would improve ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-020-02633-7
更新日期:2021-02-01 00:00:00
abstract::Instrumentation systems for breath-to-breath analysis of respiratory gas exchange have been faulted by phase lags between various flow and composition signals and by difficulties in gathering and processing large amounts of data. The system described here represents an attempt to overcome these problems. Phase delays ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/BF02367493
更新日期:1983-01-01 00:00:00
abstract::This paper describes a finite volume method for modeling electrical activation in a sample of cardiac tissue using the bidomain equations. Microstructural features to the level of cleavage planes between sheets of myocardial fibers in the tissue are explicitly represented. The key features of this implementation compa...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-005-1434-6
更新日期:2005-05-01 00:00:00
abstract::Much effort is expended in developing biomimetic scaffolds that provide the micro-architecture of native tissue with appropriate cellular niches. Such scaffolds are often seeded with progenitor cells to generate engineered replacements for diseased or damaged tissues. An alternative approach relies on biology, rather ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-014-1174-6
更新日期:2015-03-01 00:00:00
abstract::It is well known that neutrophils take much longer to traverse the pulmonary capillary bed than erythrocytes, and this is likely due to differences in the structure and rheology of the cells. In this study, we simulate the transit of a neutrophil in a capillary using a Newtonian drop model and a viscoelastic drop mode...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-007-9286-x
更新日期:2007-05-01 00:00:00
abstract::The design and operating characteristics of the first self-contained in-the-ear device to deliver altered auditory feedback is described for applications with those who stutter. The device incorporates a microdigital signal processor core that reproduces the high fidelity of unaided listening and auditory self-monitor...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.1541014
更新日期:2003-02-01 00:00:00
abstract::The development of brain interface (BI) technology continues to attract researchers with a wide range of backgrounds and expertise. Though the BI community is committed to accurate and objective evaluation of methods, systems, and technology, the very diversity of the methods and terminology used in the field hinders ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-005-7706-3
更新日期:2005-11-01 00:00:00
abstract::The influence of scaffold compliance on blood vessel tissue engineering remains unclear and compliance mismatch issues are important to an in vivo tissue-engineering approach. We have designed and constructed a modular bioreactor system that is capable of imparting pulsatile fluid flow while simultaneously measuring v...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-007-9304-z
更新日期:2007-08-01 00:00:00
abstract::The emerging field of micro-technology has opened up new possibilities for exploring cellular chemotaxis in real space and time, and at single cell resolution. Chemotactic cells sense and move in response to chemical gradients and play important roles in a number of physiological and pathological processes, including ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-011-0489-9
更新日期:2012-06-01 00:00:00
abstract::Cochlear implantation consists in electrically stimulating the auditory nerve by inserting an electrode array inside the cochlea, a bony structure of the inner ear. In the absence of any visual feedback, the insertion results in many cases of damages of the internal structures. This paper presents a feasibility study ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-020-02671-1
更新日期:2020-10-30 00:00:00
abstract::A mathematical model is presented that estimates joint kinematics and kinetics using measured external resultant loads and readily available parameters. The musculo-skeletal system was represented by a planar three degrees of freedom open kinematic chain. Information extraction was limited to the flexion-extension fun...
journal_title:Annals of biomedical engineering
pub_type: 临床试验,杂志文章
doi:10.1023/b:abme.0000030241.26857.75
更新日期:2004-05-01 00:00:00
abstract::The finite element method is employed to simulate two-dimensional (axisymmetric) drug diffusion from a finite drug reservoir into the skin. The numerical formulation is based on a general mathematical model for multicomponent nonlinear diffusion that takes into account the coupling effects between the different compon...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-005-5788-6
更新日期:2005-10-01 00:00:00
abstract::A study that customizes the feature generator parameters of an asynchronous Brain Interface (BI) is discussed. The goal is to detect the presence of a certain pattern, in the ongoing EEG, associated with a specific movement and to improve the system's performance. Results of this study show that customization mostly b...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-006-9097-5
更新日期:2006-06-01 00:00:00
abstract::Currently, autologous cartilage provides the gold standard for auricular reconstruction. However, synthetic biomaterials offer a number of advantages for ear reconstruction including decreased donor site morbidity and earlier surgery. Critical to implant success is the material's mechanical properties as this affects ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1688-1
更新日期:2016-12-01 00:00:00
abstract::Development of increasingly complex integrated cellular systems will be a major challenge for the next decade and beyond, as we apply the knowledge gained from the sub-disciplines of regenerative medicine, synthetic biology, micro-fabrication and nanotechnology, systems biology, and developmental biology. In this pros...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-013-0902-7
更新日期:2014-02-01 00:00:00
abstract::Cell migration is a fundamental process that is crucial to a variety of physiological events. While traditional approaches have focused on two-dimensional (2D) systems, recent efforts have shifted to studying migration in three-dimensional (3D) matrices. A major distinction that has emerged is the increased importance...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-010-9970-0
更新日期:2010-05-01 00:00:00
abstract::Mitral valve regurgitation (MVR) is common in patients receiving left ventricular assist device (LVAD) support, however the haemodynamic effect of MVR is not entirely clear. This study evaluated the haemodynamic effect of MVR with LVAD support and the influence of inflow cannulation site and LVAD speed modulation. Lef...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1579-5
更新日期:2016-09-01 00:00:00
abstract::During the fetal-to-neonatal transition, transvalvular pressures (TVPs) on the aortic and pulmonary valves change dramatically-but differently for each valve. We have examined changes in the molecular stability and crosslinking of collagen during this transition. Aortic and pulmonary valves were harvested from fetal a...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-010-0061-z
更新日期:2010-09-01 00:00:00
abstract::In vitro and in vivo studies were conducted on omega-3 fatty acid-derived biomaterials to determine their utility as an implantable material for adhesion prevention following soft tissue hernia repair and as a means to allow for the local delivery of antimicrobial or antibiofilm agents. Naturally derived biomaterials ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-015-1489-y
更新日期:2016-03-01 00:00:00
abstract::We present a method of measuring force response of a single living cell, attached to a substrate, in situ, by a functionalized microelectromechanical systems sensor that applies local deformation on the cell. The sensor is a single crystal silicon microcantilever beam with prescribed shape and geometry, and is coated ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1114/1.1591189
更新日期:2003-09-01 00:00:00
abstract::Glaucoma is a common optic neuropathy characterized by retinal ganglion cell death. Elevated intraocular pressure (IOP), a key risk factor for glaucoma, leads to significant biomechanical deformation of optic nerve head (ONH) cells and tissues. ONH astrocytes respond to this deformation by transforming to a reactive, ...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-017-1967-5
更新日期:2018-02-01 00:00:00
abstract::Additive manufacturing, also known as 3D printing, has emerged over the past 3 decades as a disruptive technology for rapid prototyping and manufacturing. Vat polymerization, powder bed fusion, material extrusion, and binder jetting are distinct technologies of additive manufacturing, which have been used in a wide va...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1007/s10439-016-1678-3
更新日期:2017-01-01 00:00:00
abstract::During defecation, solid, semisolid or liquid stools are eliminated via the anus in a complex physiological process. Up to 25% of the population are affected by anorectal disorders that are poorly recognized and treated. We developed a new bionics device, a simulated stool named Fecobionics, to replace several current...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-018-02149-1
更新日期:2019-02-01 00:00:00
abstract::Intra-cardiac flow has been explored for decades but there is still no consensus on whether or not healthy left ventricles (LV) may harbour turbulent-like flow despite its potential physiological and clinical relevance. The purpose of this study is to elucidate if a healthy LV could harbour flow instabilities, using i...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-016-1614-6
更新日期:2016-11-01 00:00:00
abstract::This paper presents the permeability analysis of neuroactive drugs and correlation with in vivo brain/plasma ratios in a dynamic microfluidic blood-brain barrier (BBB) model. Permeability of seven neuroactive drugs (Ethosuximide, Gabapentin, Sertraline, Sunitinib, Traxoprodil, Varenicline, PF-304014) and trans-endothe...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-014-1086-5
更新日期:2014-12-01 00:00:00
abstract::Normalized maximal ventricular power (nPWRmax) is an index of cardiac function which measures the innate blood pumping ability, or contractility, of the left ventricle (LV), and its noninvasive assessment could prove useful in a variety of patients. nPWRmax is defined as the maximum instantaneous product of LV pressur...
journal_title:Annals of biomedical engineering
pub_type: 临床试验,杂志文章
doi:10.1114/1.1415530
更新日期:2001-11-01 00:00:00
abstract::Local hemodynamics are an important factor in atherosclerosis, from the development of early lesions, to the assessment of stroke risk, to determining the ultimate fate of a mature plaque. Until recently, our understanding of arterial fluid dynamics and their relationship to atherosclerosis was limited by the use of i...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章,评审
doi:10.1114/1.1467679
更新日期:2002-04-01 00:00:00
abstract::Conventional nanoporous hydrogels often lead to slow cartilage deposition by MSCs in 3D due to physical constraints and requirement for degradation. Our group has recently reported macroporous gelatin microribbon (μRB) hydrogels, which substantially accelerate MSC-based cartilage formation in vitro compared to convent...
journal_title:Annals of biomedical engineering
pub_type: 杂志文章
doi:10.1007/s10439-020-02522-z
更新日期:2020-07-01 00:00:00