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Emerging Trends of Nanotechnology Towards Picotechnology: Energy and Molecules

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Emerging Trends of Nanotechnology Towards Picotechnology: Energy and Molecules Emerging Trends of Nanotechnology towards Picotechnology: Energy and molecules R. Sharma*, A. Sharma**, C.J. Chen* *Center of Nanomagnetics and Biotechnology, Florida State University, Tallahassee, FL 32310 USA, [email protected] **Department of Electrical Engineering, MP A&T University, Udaipur, Rajasthan India ABSTRACT will cause high magnitude of physiological In nature, metal oxide particles display their reaction activation than metal is administered in existance at the level of picomolecules in nanomoles. In keeping this view in mind, solution state and bioactive states in the body. reactions requiring calcium, iron, magnesium, We put evidence of picomolar behavior of zinc etc cofactors in picomole concentration is molecules different than nanomolar behavior of becoming area of interest to understand the particles. These particles can be encapsulated in potentials of ‘extremely low metal polymers and can be functionalized with protein, administration’ to trigger the battery of nucleotides, and drugs to develop as smart intracellular and physiological milieu due to less intracellular targeting pico-devices. The known or unknown proteins and protein preparation technique and physiological regulatory factors. The protein and metal conditions decide the size and functionality of cofactor interaction in biomolecules is extremely these pico-carrier devices. Their usable success important and its picomolar range needs new rate, feasibility and potentials are yet to be technical development. We focus on role of proven or we donot know. The major difference sodium in neurofilament proteins, calcium in between nanodevices and pico-devices is their actin-myosin proteins and microtubule proteins. intermolecular and intramolecular However, ultra small concentration of ions is less thermodynamics in medium and their molecular likely to trigger at molecular conformation level conformational interaction with molecular but more likely triggers thermodynamics and assembly in cytoarchitecture of the energy activation by increasing enthalpy and neurofilament, actin-myosin, microtubule entropy. proteins. Pico-carrier device can be presumed as potential spears without interacting with host 1.1 Picodevices signal transduction and immunoprotection. In In biochemical analysis and physical analysis, conclusion, ultrafine size of newer electrothermal atomic absorption picotechnology products may be better suited spectrophotometry (EAAS) was studied using a and easy to functionalize them for design of Perkin-Elmer-Zeeman 3030 spectrophotometer is particle based picodrug, picochemicals, pico- routine technique [1]. Other example is thyroid targeting molecules. hormones measurement by ELISA or Keywords: Picoscale, Picotechnology, chemiluminescence to measure the TSH, T3 (9- 26 picomoles/L) and T4 (0.60-1.5 picomoles/L). Molecules, Energy, Dimensionality The art of measuring picomolar concentrations of nucleotide phosphates or energy molecules is 1 INTRODUCTION age old [2]. In the electronics field, picodevices Several metal solutions are known to act with such as picomole concentration of Cl- by high activity as their concentration in solution is picoelectrometeric titration, sodium ion decreased towards picomoles. Best examples are monitoring device of quadrupole electron impact calcaria phos(calcium phosphate), natrum mur mass spectrometry, picobio-inspired (sodium sulphate), ferrum ox (iron oxide), environmental biosensors have made arsenica(arsenic oxide) known in Homeopathy advancement. based on the physical principle of administration A biosensor named “Picoscope” was of similar metal ions ‘amplify’ the bioreaction of developed for real-time simultaneous detection same metals in physiological conditions (more of several biological agents by measuring 8 than 10 times) in the inverse order upon picometer-range changes of the thickness of decreased metal administered concentration. If different biorecognition spots on the biochip picomoles of metal is administered in the body surface. The Picoscope technology seems NSTI-Nanotech 2008, www.nsti.org, ISBN 978-1-4200-8504-4 Vol. 2 539 significantly increase the power of research detectable. The picochip technology has instruments for bio-, nano- and pico- tremendous advantage in picoparticles based on technologies. antibody-biotin-streptavidin-metal compounds to generate bio-response [2]. Fig. 4. Sensogram of detection of L. monocytogenes at concentration 107 cell/ml. To increase the sensor's response depends on the surface density of the immobilized antibody Fig. 1. Scheme of the Picoscope: 1, was varied by changing the density of the biotin superluminescent laser diode; 2, scanned Fabry– molecules during the biochip preparation stage Perot interferometer; 3, semi-transparent mirror; and streptavidin concentration to optimize 4, glass slip; 5, optics; 6, CCD camera; 7, fluidic capturing the remaining cells and soluble system; 8, recognition spots or wells; 9, proteins. computer. Fig. 2. (a) Scheme of the interference pattern formation: 1, air; 2, glass slip with a biomolecular layer; 3, biological solution; 4 and 5, reflected beams. (b) Reflection spectrum of a glass slip of 50 µm thick. Fig. 5. Sensogram of detection of L. monocytogenes at concentration 104 cell/ml by 1.2 Pico-biochip second antibody. Surface plasmon resonance (SPR) “BIAcore The Picoscope used immobilization of one 2000” and Picoscope can be useful for antibody on the biochip surface via the biotin– biosensors based on fluorescent labels. Other streptavidin bridge. Bacteria by the Picoscope attractive applications of the Picoscope based on can be sensed by biotinilated glass slip: CCD camera and multi-spot biochip are high streptavidin, first biotinilated antibody against throughput screening and multi-agent analysis of bacteria, and antigen in the form of cell liquids, e.g. for food pathogen detection.The suspension at the concentration of 107 cells/ml. picochip production is in progress based on The change of the antigen layer thickness immobilization of antibodies and the biotin– averaged over the sensor's surface can be 540 NSTI-Nanotech 2008, www.nsti.org, ISBN 978-1-4200-8504-4 Vol. 2 streptavidin bridge such as measuring binding kinetics using the two-channel Picoscope. Figure 2. Electron micrographs of two types of intermediate filaments in cells of the nervous system. (A)Freeze-etch image of neurofilaments in a nerve cell axon, showing the extensive cross-linking through protein cross-bridges - an arrangement believed to provide great tensile strength in this long cell process. The cross-links Fig. 7. Experimental setup for multi spot biochip are formed by the long, nonhelical extensions at preparation. the carboxyl terminus of the largest neurofilament protein. (B)Freeze-etch image of glial filaments in glial cells illustrating that these filaments are smooth and have few crossbridges.(C) Conventional electron micrograph of a cross-section of an axon showing the regular side-to-side spacing of the neurofilaments, which greatly outnumber the MTs [3]. Fig. 8. Image with visualized spots of antibody Overexpression of NF-L or NF-H in transgenic on the biochip. mice indicated the role of neurofilaments in the pathogenesis of motor neuron disease. An image of several antibody spots of 280 µm in diameter visualized by Picoscope is shown in Fig. 8. For the visualization, the sandwich assay was realized on a biochip similar to that used for L. monocytogenes detection. The size, shape and position of the antibody spots had the required regularity for multi-agent analysis by the Picoscope[2]. 2 BIOSYSTEMS 2.1 Neurofilaments The network of neurofilaments is further visible at the subnano range of angstrom A units(100 picometers). It enhances the understanding and visualization of proteins in nerve cells containing neurofilaments. The intermediate filaments include the three neurofilament (NF) proteins (designated NF-L, NFM, and NF-H for light, medium, and heavy, respectively). Neurofilaments appear to be anchored to actin filaments and MTs by neuronal members of the plakin family. α-internexin, IF, nestin, are also play role. Figure 3. Actin filaments. (A) Electron micrographs of negatively stained actin NSTI-Nanotech 2008, www.nsti.org, ISBN 978-1-4200-8504-4 Vol. 2 541 filaments. (B) The helical arrangement of actin This specific association of +TIPs with MT molecules in an actin filament. distal ends was initially explained by treadmilling. Other factor is “delivery (or 1.2 Actin deposition) of Kinesin” driven. MTs It is cytoskeletal protein 7 nm in diameter polar depolymerise and GFP-TIP speculate dynamic structure and form three dimensional behaviour of MTs. However, MT behaviour networks of actin cytoskeleton. using specific GFP-tagged MT plus end binding The actin monomers bind with ATP and proteins as markers has become very popular. hydrolysis play a key role with tubulin to provide Visualization of GFP-TIPs in cells by time-lapse dynamic instability, which is very important for fluorescence microscopy revealed that all fusion their functions. Tropomyosin, binds with actin proteins move in a comet-like pattern and filaments to act cooperatively in generating the demonstrated that, at least in CHO cells, most movements of the cell surface, including MTs grow persistently from the cell centre cytokinesis, phagocytosis, and cell locomotion. towards the cell periphery [3]. 1.3 Microtubules (MTs) 1.5 Functions of +TIPs MTs are the polymers play role in cell Several categories of +TIPs, EBs, CLIPs, movements, intracellular transport
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