#nanodevice

Thermoelectric nanodevice based on Majorana fermions is proposed

[ad_1] A particle that is its own anti-particle is the subject of a new theoretical study. These Majorana quasi-particles can emerge as excitations in topological superconductors. [ad_2] Source link

Stretchable Nano-Device To Lead Development Of Smart Contact Lenses - http://www.healthaim.com/stretchable-nano-device-lead-development-smart-contact-lenses/41633

Lipofuscin is a waxy heterogeneous substance that is comprised of aggregates of metabolic cellular waste end products, which reside within the lysosomes and cytosols of particular types of human cells. This substance can neither be degraded further via the typical complement of lysosomal enzymes, nor ejected from cells, but can be somewhat diluted through cell division and subsequent cellular growth. This autofluorescent pigment is considered to be a significant aging-associated “wear-and-tear” compound that is found in the liver, kidney, heart muscle, adrenals, nerve cells and ganglion cells. It is specifically arranged around the cell nucleus, and is a type of lipochrome.

“Defuscin” nanodevice mediated lipofuscin removal proceeding inside neuronal cell

In a broader context, lipofuscin is often considered as one of several forms of undesirable proteinaceous agglomerations; others sometimes called ceroids, inclusion bodies, plaques, or aggresomes, contingent on their source and composition. It accumulates over time within aging cells to become manifest as a significant percentage of a cell’s internal volume. As a consequence, it may impede normal cellular processes, affecting proteasomal activity and protein turnover, and is present as typical feature in neurodegenerative diseases as well as aging. Within the aging human brain, deposits of lipofuscin are not uniformly distributed, but rather, are concentrated at specific sites of functional interest. The prevailing thought is that the major source of lipofuscin is derived from the incomplete lysosomal degradation of cell membrane lipids and damaged mitochondria.

It is conceivable that the future development of nanomedical robotics, as described in the upcoming book: Nanomedical Device and Systems Design: Challenges, Possibilities, Visions (FJ Boehm – Editor), to be published on Nov/22/13 by CRC Press (Taylor & Francis) might enable the capacity for the therapeutic removal of lipofuscin from individual cells in massively parallel fashion without the initial use of UV transparency. Conceptual dedicated autonomous nanodevices (~200 nm in diameter – where one nanometer is a billionth of a meter) might penetrate the cell membranes of neurons and other cells and undertake the removal of lipofuscin through various means, as described in the book excerpt below:

“Although entirely conceptual and seemingly impracticable currently (2013), advanced AI [Artificial Intelligence] involvement in the design/optimization of sophisticated nanomedical devices working in conjunction with mature nanomanufacturing may indeed bring about much more complex, albeit far more rapid and efficient lipofuscin detection and removal. Advanced autonomous nanodevices might precisely locate lipofuscin granules by exploiting its strong fluorescence signatures (emission spectrum ranges from 450 to 700 nm) [1] …. to match with onboard reference spectral profiles. The prospective armamentarium at the disposal of these autonomous diamondoid “defuscin” class nanodevices…. might allow for the complete eradication of lipofuscin aggregates utilizing a feedthrough digestive strategy. These entities may be propelled by arrays of oscillating piezoelectric “fins” or via integrated magnetic nanoparticles, which might be activated and controlled externally. The conical inlet port of the nanodevice would be lined with molecules that possess high affinities for A2E [a primary lipofuscin constituent] and other lipofuscin elements. Once a lipofuscin granule has been captured it would proceed to be drawn into the core, where it would be digested by potent encapsulated enzymes or nanomechanically minced into a liquid state and subsequently purged from the outlet port. This functionality would be similar to Freitas’s microbivore artificial mechanical phagocytes, which operate under a “digest and discharge” protocol” [2].

“The desired result of this defuscin mediated digestion would be the fragmentation and ideally dissolution of the chemical crosslinks that provide lipofuscin its refractive properties. Other defuscin-class nanodevice designs may include proboscises that serve dual purposes; as potential electrodes for highly localized hyperthermic interventions, following insertion into the lipofuscin mass, or hollow nanosyringes… for the injection of powerful cleaving enzymes. The nanomechanical segmentation or disassembly of individual lipofuscin granules at atomic/molecular resolution may be possible employing arrays of diamondoid “debriders” to reduce lipofuscin to its most elemental and harmless fractions. Larger fragments could subsequently be encapsulated for egress through the urinary or gastrointestinal tracts.

The overarching premise here is that treated cells might be thus induced to a more robust state of health (perhaps functioning at more youthful levels) when this cellular burden is extricated.”

Anatomy of a conceptual “defuscin” class lipofuscin removal nanodevice

Anatomy of a conceptual “defuscin” class lipofuscin removal nanodeviceAnatomy of a conceptual “defuscin” class lipofuscin removal nanodevice

References:

[1] Eichhoff, G., Garaschuk, O., Two-photon imaging of neural networks in a mouse model of Alzheimer’s disease. Cold Spring Harb Protoc. 2011(10), 1206-16, 2011.

[2] Freitas Jr., R.A., Microbivores: Artificial Mechanical Phagocytes using Digest and Discharge Protocol, J. Evol. Technol. 14, 1-52, 2005.

This piece will be appearing in:

Nanomedical Device and Systems Design

Challenges, Possibilities, Visions

This book endeavors to explore a significant range of conceptual nanomedical components, devices and systems, as well as to present some of the latest real world laboratory-based research, which may lead to the development of advanced and highly efficacious nanomedical technologies. This volume is trisegmented; the initial segment utilizes an envisaged conceptual exemplar nanodevice and system (Vascular Cartographic Scanning Nanodevice – VCSN), which the author has evolved, to explore various potential design considerations, which might enable specific functionalities of sophisticated autonomous nanomedical devices. The second segment is comprised of chapters that have been contributed by world class experts in the field, who present and articulate pioneering laboratory-based nanomedical research. The final segment investigates more highly conceptual nanomedical possibilities and visions relating to the implementation of advanced nanomedicine in remote regions and the developing world, as well as nanomedicine in space applications, human augmentation and longevity.

Nanobotmodels Company, in collaboration with the editor of Nanomedical Device and Systems Design: Challenges, Possibilities, Visions (FJ Boehm), have created artistic representations of a conceptual advanced “defuscin” (lipofuscin eradication) nanodevice.

Nanobotmodels was established in 2007 with the goal of developing highly innovative, digital graphics to depict actual and conceptual technologies via the synergistic fusion of art and science. The still nascent, yet prospectively powerful discipline of nanotechnology is poised to radically transform medicine, engineering, biotechnology, electronics and myriad other sectors in the relative near-term. Hence, visionary artistic renderings that portray various aspects of this exciting nanofuture will be beneficial in facilitating a clear understanding of its fundamental concepts to a broad demographic.

Nanobotmodels generates imaginative and engaging state-of-the-art nanotechnology and nanomedical illustrations and animations. Any prototypical component, device, system or far flung concept that might be conceived of can be translated into captivating and colorful photorealistic animated or static renderings and presentation materials…. We bring them all to life for you!

  by Y. Svidinenko and FJ Boehm

hero image used from http://www.nanobotmodels.com/?page_id=25/404

The McAlpine lab has developed a basic platform for sensing medically relevant information that they're now refining. They created a robust, wireless circuit chip that can withstand daily wear and harsh chemicals. This chip can tell when there are any bacteria or other cells on it. When applied to a surface, it can be alert you to any contaminants. The lab took inspiration from children's temporary tattoos and developed a mechanism for easily applying the chip to biological surfaces. Using raw silk, they produce a flexible, gel-like surface that they can print the chip on. When the silk gets wet, it becomes sticky and dissolves. If you do this while you're pressing the chip onto a biological surface, it will transfer off the silk and stick to that surface. By virtue of the materials and design, the chip can discern the presence of a single cell, which is extraordinarily useful in the medical world. Moreover, it's wireless, so that information can be remotely monitored.

Currently, the lab is looking at uses for the chip on skin, teeth, medical supplies, and eventually other biological surfaces. On teeth, it could be used to detect the presence of bacteria that cause mouth or digestive tract infections. In lab tests they were able to detect H. pylori, a bacteria that (in conjunction with a few other factors) causes stomach ulcers, in saliva. If you can constantly monitor your saliva for H. pylori, you can get treatment for it before you actually get an ulcer. Similarly, medical equipment needs to be sterile so that it doesn't bring any infections to patients. Having such a sensitive and quick monitoring system would allow medical care providers to avoid just that situation. It would improve upon the current procedure for testing food & water for pathogens, in which scientists culture a sample of the food or water to see if a known pathogen grows. Since the pathogen has to grow for this method, it can take days or weeks. The graphene chip is instant because it's a direct, electronic measurement of the chip in real time.

The McAlpine lab's work into harvesting biological energy to power devices is just as intriguing. One of their major long-term projects in this area is developing a device that can harvest the mechanical energy of breathing to power a pacemaker. When you breathe, your lungs expand and stretch. We power this action through the energy we get from food. If you have a device that can sit on top of this surface and then make its own energy from that physical movement, it wouldn't need external power. That's a problem in modern pacemakers, which use chemical batteries and need to be replaced (through open chest surgery) every five or so years. Ideally, such a device would be able to provide the pacemaker all the energy it needs just from that lung movement. Only one surgery would every be necessary, since there wouldn't be any energy source to replace. This is theoretically possible, since the mechanical energy of the lungs during breathing is more than what a pacemaker uses. It's just a question of developing the right device.

As amazing as this technology is, it's still in its early stages. The ideas are there, but not all of the problems have been solved to make it entirely practical. One of the biggest issues I see is that the sensory chip isn't very selective. Right now, the lab has been able to produce graphene strips that only respond to bacteria, but ideally you would want it to be able to detect single species, or at least a single group of species that causes one disease. Having the chip respond selectively to bacteria is already a huge step, since that means it would be able to ignore things like your own cells. However, there's still a lot more refinement to be done (and they are working on it!).