scholarly journals Bio-nano interface: The impact of biological environment on nanomaterials and their delivery properties

2017 ◽  
Vol 263 ◽  
pp. 211-222 ◽  
Author(s):  
Kaimin Cai ◽  
Andrew Z. Wang ◽  
Lichen Yin ◽  
Jianjun Cheng
Keyword(s):  
Biological Environment ◽  
The Impact

scholarly journals Dynamical behavior of two predators–one prey model with generalized functional response and time-fractional derivative

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Salih Djilali ◽  
Behzad Ghanbari
Keyword(s):  
Fractional Derivative ◽  
Dynamical Behavior ◽  
Time Derivative ◽  
Interaction Model ◽  
Integration Rule ◽  
Existence And Stability ◽  
Natural Result ◽  
Biological Environment ◽  
Fractional Time Derivative ◽  
The Impact

AbstractThe behavior of any complex dynamic system is a natural result of the interaction between the components of that system. Important examples of these systems are biological models that describe the characteristics of complex interactions between certain organisms in a biological environment. The study of these systems requires the use of precise and advanced computational methods in mathematics. In this paper, we discuss a prey–predator interaction model that includes two competitive predators and one prey with a generalized interaction functional. The primary presumption in the model construction is the competition between two predators on the only prey, which gives a strong implication of the real-world situation. We successfully establish the existence and stability of the equilibria. Further, we investigate the impact of the memory measured by fractional time derivative on the temporal behavior. We test the obtained mathematical results numerically by a proper numerical scheme built using the Caputo fractional-derivative operator and the trapezoidal product-integration rule.

scholarly journals Transmission Electron Microscopy as a Powerful Tool to Investigate the Interaction of Nanoparticles with Subcellular Structures

2021 ◽  
Vol 22 (23) ◽  
pp. 12789
Author(s):  
Manuela Malatesta
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Nanoparticle Uptake ◽  
Ultrastructural Morphology ◽  
Functional Value ◽  
Transmission Electron ◽  
Biological Environment ◽  
Microscopy Techniques ◽  
The Impact

Nanomedical research necessarily involves the study of the interactions between nanoparticulates and the biological environment. Transmission electron microscopy has proven to be a powerful tool in providing information about nanoparticle uptake, biodistribution and relationships with cell and tissue components, thanks to its high resolution. This article aims to overview the transmission electron microscopy techniques used to explore the impact of nanoconstructs on biological systems, highlighting the functional value of ultrastructural morphology, histochemistry and microanalysis as well as their fundamental contribution to the advancement of nanomedicine.

scholarly journals Participation of Industry, Community and Government in Monitoring the Impact of Waste Development through the Early Warning System

2021 ◽  
Vol 5 (2) ◽  
pp. 294-305
Author(s):  
Veronika Nugraheni Sri Lestari ◽  
Dwi Cahyono ◽  
Sri Susilowati
Keyword(s):  
Environmental Sustainability ◽  
Human Life ◽  
Electronic Devices ◽  
Warning System ◽  
Coordination Mechanism ◽  
Heavy Burden ◽  
Biological Environment ◽  
The Impact ◽  
Industry Community

In human life, it cannot be separated from the environment in which we live. Human negligence in building industry without caring the impact on environment can damage the physical and biological environment slowly and indirectly. Therefore an effort to preserve the quality of environment, especially for the environment adjacent to the settlement, is necessary and can be performed in various ways including technology utilization. The development of technology-based microcontrollers gains more popularity. Technology develops rapidly and electronic devices have become one compulsory device to be owned. Wastewater is industrial waste should be controlled prior to passing surrounding environment to avoid pollution. The concluded of this research are 1 implementation of management and monitoring carried out by industry should be led to the awareness for environmental sustainability, 2 Industrial business actor has not benefited directly from the activities of management and monitoring that have been carried out, and still considers that the obligation is a heavy burden in terms of cost, 3 Inter-institution coordination mechanism is still not clear so that each institution has not been performed their duties and functions well, 4 involvement and community awareness around the industry is relatively low.

The impact of doped silicon quantum dots on human osteoblasts

RSC Advances ◽  
2016 ◽  
Vol 6 (68) ◽  
pp. 63403-63413 ◽  
Author(s):  
Lucie Ostrovska ◽  
Antonin Broz ◽  
Anna Fucikova ◽  
Tereza Belinova ◽  
Hiroshi Sugimoto ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Particle Size ◽  
Fetal Bovine Serum ◽  
Human Osteoblasts ◽  
Doped Silicon ◽  
Fetal Bovine ◽  
Biological Environment ◽  
The Impact ◽  
Si Quantum Dots ◽  
Co Doped

Interaction of red/infrared fluorescent (B, P co-doped) Si quantum dots with biological environment (medium and cells) is sensitive to the presence of fetal bovine serum, to the particle size and surface potential and influenced by particle ageing.

scholarly journals Impact of surface topography and coating on osteogenesis and bacterial attachment on titanium implants

2018 ◽  
Vol 9 ◽  
pp. 204173141879069 ◽  
Author(s):  
Laila Damiati ◽  
Marcus G Eales ◽  
Angela H Nobbs ◽  
Bo Su ◽  
Penelope M Tsimbouri ◽  
...  
Keyword(s):  
Surface Topography ◽  
Dental Implants ◽  
Antimicrobial Properties ◽  
Bacterial Attachment ◽  
Titanium Implants ◽  
Premature Failure ◽  
Biological Environment ◽  
The Impact

Titanium (Ti) plays a predominant role as the material of choice in orthopaedic and dental implants. Despite the majority of Ti implants having long-term success, premature failure due to unsuccessful osseointegration leading to aseptic loosening is still too common. Recently, surface topography modification and biological/non-biological coatings have been integrated into orthopaedic/dental implants in order to mimic the surrounding biological environment as well as reduce the inflammation/infection that may occur. In this review, we summarize the impact of various Ti coatings on cell behaviour both in vivo and in vitro. First, we focus on the Ti surface properties and their effects on osteogenesis and then on bacterial adhesion and viability. We conclude from the current literature that surface modification of Ti implants can be generated that offer both osteoinductive and antimicrobial properties.

Adsorption of Biomolecules on Ceramic Particles and the Impact on Biomedical Applications

2006 ◽  
Vol 45 ◽  
pp. 741-751 ◽  
Author(s):  
Ludwig J. Gauckler ◽  
Kurosch Rezwan
Keyword(s):  
Metal Oxide ◽  
Protein Adsorption ◽  
Hydrophobic Interaction ◽  
Self Assembly ◽  
Electrostatic Interactions ◽  
High Turnover ◽  
Synthetic Materials ◽  
Biological Environment ◽  
Key Aspects ◽  
The Impact

Protein adsorption onto metal oxide surfaces is an essential aspect of the cascade of biological reactions taking place at all interfaces between implanted materials and the biological environment. The types and amounts of adsorbed proteins mediate subsequent adhesion, proliferation and differentiation of cells. Protein adsorption to surfaces of metal oxides and their kinetics are important in the formation and growth of seashells, one of the toughest natural ceramics, in modern bio-analytical devices as well as in bone and teeth implant technology. This paper describes results obtained in a feasibility study of how to use metal-oxide particles to obtain biosensors with a high turnover. The most important features of proteins are outlined describing them as purpose-built "polymers" from amino acids with specific conformations. Some key aspects of Metaloxide (MeO) surfaces in water and the influence of electrostatic and hydrophobic interaction on protein adsorption are reported. Results concerning the interaction between different proteins and MeO surfaces in water are discussed in detail. Examples of purely electrostatic interactions of proteins with MeO surfaces as well as the influence of hydrophobic interaction are elucidated. An outlook of the implications of the new insights on natural and synthetic materials will be given concerning bio-compatibility, bio-mineralization and self assembly of materials.

Formation of Lunar Craters and Bright Rays as a Result of Meteorite Impacts

1962 ◽  
Vol 14 ◽  
pp. 415-418
Author(s):  
K. P. Stanyukovich ◽  
V. A. Bronshten
Keyword(s):  
Explosive Charge ◽  
The Moon ◽  
Meteorite Impacts ◽  
The Earth ◽  
Lunar Craters ◽  
The Impact

The phenomena accompanying the impact of large meteorites on the surface of the Moon or of the Earth can be examined on the basis of the theory of explosive phenomena if we assume that, instead of an exploding meteorite moving inside the rock, we have an explosive charge (equivalent in energy), situated at a certain distance under the surface.

The Geosciences Applied to Lunar Exploration

1962 ◽  
Vol 14 ◽  
pp. 169-257 ◽  
Author(s):  
J. Green
Keyword(s):  
Lunar Surface ◽  
Probable Mechanism ◽  
Point Of View ◽  
Lunar Exploration ◽  
Geological Model ◽  
Apply Geophysics ◽  
Surface Features ◽  
The Impact

The term geo-sciences has been used here to include the disciplines geology, geophysics and geochemistry. However, in order to apply geophysics and geochemistry effectively one must begin with a geological model. Therefore, the science of geology should be used as the basis for lunar exploration. From an astronomical point of view, a lunar terrain heavily impacted with meteors appears the more reasonable; although from a geological standpoint, volcanism seems the more probable mechanism. A surface liberally marked with volcanic features has been advocated by such geologists as Bülow, Dana, Suess, von Wolff, Shaler, Spurr, and Kuno. In this paper, both the impact and volcanic hypotheses are considered in the application of the geo-sciences to manned lunar exploration. However, more emphasis is placed on the volcanic, or more correctly the defluidization, hypothesis to account for lunar surface features.

Asteroid and Comet Impact Speeds upon Mars: Significance for Panspermia and the Supply of Organics

1997 ◽  
Vol 161 ◽  
pp. 197-201 ◽  
Author(s):  
Duncan Steel
Keyword(s):  
Probability Distributions ◽  
Regions Of Interest ◽  
Significant Fraction ◽  
Organic Chemicals ◽  
Impact Speed ◽  
The Mean ◽  
The Impact

AbstractWhilst lithopanspermia depends upon massive impacts occurring at a speed above some limit, the intact delivery of organic chemicals or other volatiles to a planet requires the impact speed to be below some other limit such that a significant fraction of that material escapes destruction. Thus the two opposite ends of the impact speed distributions are the regions of interest in the bioastronomical context, whereas much modelling work on impacts delivers, or makes use of, only the mean speed. Here the probability distributions of impact speeds upon Mars are calculated for (i) the orbital distribution of known asteroids; and (ii) the expected distribution of near-parabolic cometary orbits. It is found that cometary impacts are far more likely to eject rocks from Mars (over 99 percent of the cometary impacts are at speeds above 20 km/sec, but at most 5 percent of the asteroidal impacts); paradoxically, the objects impacting at speeds low enough to make organic/volatile survival possible (the asteroids) are those which are depleted in such species.

Organic Syntheses During the Impact of a Comet with a Gaseous Planet

1997 ◽  
Vol 161 ◽  
pp. 189-195
Author(s):  
Cesare Guaita ◽  
Roberto Crippa ◽  
Federico Manzini
Keyword(s):  
Polymeric Material ◽  
Molecular Form ◽  
Parent Compound ◽  
Blue Filter ◽  
Organic Syntheses ◽  
The Impact

AbstractA large amount of CO has been detected above many SL9/Jupiter impacts. This gas was never detected before the collision. So, in our opinion, CO was released from a parent compound during the collision. We identify this compound as POM (polyoxymethylene), a formaldehyde (HCHO) polymer that, when suddenly heated, reformes monomeric HCHO. At temperatures higher than 1200°K HCHO cannot exist in molecular form and the most probable result of its decomposition is the formation of CO. At lower temperatures, HCHO can react with NH3 and/or HCN to form high UV-absorbing polymeric material. In our opinion, this kind of material has also to be taken in to account to explain the complex evolution of some SL9 impacts that we observed in CCD images taken with a blue filter.

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