Coronavirus COVID-19 surface properties: Electrical charges status

1IMA, Marijnskaya Academy, Vice President, Environmental Toxicology, Natural Science Branch, Applied Pharmacologist, I29212, Italy 2President, T & L de Beaumont Bonelli Foundation for Cancer Research, Naples, Italy 3Professor, Department of Chemistry, University of Benghazi, Libya 4Professor, Department of Pharmacology, J.N. Medical College, AMU, Aligarh, India 5Student, Dhaka Residential Model College, Dhaka, Bangladesh 6Founder and President, Yugen Research Organization, Undergraduate Student, Western Michigan University, MI, USA 7Innovative Pharmaceutical Product Development Specialist, USA 8Medical Pharmacologist, Independent Researcher, Italy 9Profesor, Department of Medical & Health Sciences for Woman, Peoples University of Medical and Health Sciences for Women, Pakistan 10President, IMA Academy, Italy More Information

Airborne transmissibility: "Coronavirus was inded to have characteristic pattern of chemical -physical properties at X-ray.

Cristallograpy analysis
So not only carrier size is relevant for airborne transmission of some respiratory virus but also virus size and electricalfeature, envelope composition and other. The virus envelope seem involved in avoiding strategies of virus to escape to the hosts immune -system".
Because coronavirus follow determinate pattern of transmission it is crucial to observe the chemical-physical properties of the virus as the electrical-feature, molecular composition of the envelope, viral-size and physical effect that can increase airborne characteristic in aerosols. The same the kind of chemical physical link of viruses with carrier is relevant for its diffusion.
All this properties must be taken in consideration in the same evaluation process.
Even if the virus transmission depend on determinate viral charge and other relevant factors a better understanding of this related phenomena is crucial. (It must be remembered also that the smaller -particles like aereosols penetrate better lower pulmonary -tract then the larger one).
Common properties among some respiratory-virus can help in clarifying airborne-transmission: If already clearly for some common virus for other it must be inally determinate. This conclusion present great health implication in public policy.
Piotr H Pawłowski: "The charged amino-acids in the spike protein of SARS-CoV-2 exhibit some speci ic distribution. In the RBD region of the S1 unit the positive + charge dominates in the protein interior and the negative -charge prevails on the surface exposed towards ACE2 -receptor. The charged amino-acids in the S2 region preceding heptad repeats of the spike protein of SARS-CoV-2, exhibit a central concentration, and the imbalance of a positive + charge. The idea that both distributions of charged amino acids may, in an electrostaticmanner, facilitate the coronavirus infection of the cell is presented.
An evaluation of the virus-receptor binding energy, by docking the peptide resembling the human receptor site to the virus-RBD, and the estimation of electromechanical deformation of the cell membrane by S2 during the prefusion process were included. Possible prevention of viral-infection is suggested." And "Although the total structural charge of SARS-Cov-2 is positive +, the structural proteins of SARS-Cov-2 are carrying varied total electric charge related to the amino-acid AA content. The envelope, membrane and nucleocapsid proteins are positive +, and the surface spike protein S is negative. The viral spike -protein S is an essential component in the process of SARS-Cov-2 entering the cell. It contains 99 positively, and 111 negatively, charged amino-acids. Protein S consists with the two subunits S1 and S2. The S1 unit (aa 14-685) contains the receptor binding -domain (aa 333-526), RBD, interplaying with the human angiotensin-converting enzyme 2, ACE2, during virus binding to the cell. Enzymatic-cleavage in the area aa 682-685 in fully reveals subunit S2. Some segments of the S2 unit (aa 686-1273) play an important role in the fusion of SARS-CoV-2 preceding the underlying infection of cells. Although the exact location of the segments, enabling initial lipid-membrane boarding can be disputed, the investigation in the conformational conserved area of so called fusion peptide (FP), and in its close proximity seems to be rational. Similar regions to SARS-CoV Extended Bipartite Fusion-Platform, consisting with 38 amino acids perturbing membrane order in the two neighboring -regions, FP1 and FP2, may be also indicated, but they follow the FP (aa 788-806) of SARS-CoV-2 towards C-term".

Materials and methods
Whit an observational method some relevant literature are analysed and after submitting of an experimental project hipotesys a global conclusion is produced.
All literature come from biomedical database (PubMed) OR other open science source.
In this work also some preprint is reported for the scope researched.
Figures from 1 to 12 are reported in order to better clear the concept in literature cited.

Results
"The (pKa)s of the protein on the surface: At the isoelectricpoint of a protein, there is an equivalent distribution of negative and positive-charges, leading to a neutral response to a potential difference. If the pH be lowered from the isoelectric-point, it is found that, a bias is created towards the centre of positive charge of the protein. The pKa's could be derived from the pH values of the titration-curve for the S(spike)-protein of the SARS-CoV-2 using the Henderson-Hasselbalch equation: To establish this concept of the in luence of surrounding pH on the surface charge of a virus, similar experiments had already been carried out also over the other virus-strains" [1].
"a substantial portion of the TMD consists of the 2 nonpolar, neutral amino acids, valine and leucine, lending a strong hydrophobicity to the E protein. The peptide exhibits an overall net-charge of zero, the middle region being uncharged and lanked on one side by the negatively charged amino (N)-terminus, and, on the other side, the carboxy (C)terminus of variable charge. The C-terminus also exhibits some hydrophobicity but less than the TMD due to the presence of a cluster of basic, positively-charged amino acids" [2].
Science News from research organizations.
Research exposes new vulnerability for SARS-CoV-2.
Electrostatic interactions enhance the spike protein's bond to host cells.
"Using nanometer-level simulations, researchers have discovered a positively + charged site (known as the polybasic cleavage-site) located 10 nanometers from the actual binding site on the spike protein. The positively charged site allows strong bonding between the virus protein and the negativelycharged human-cell receptors" [3].
Edris Joonaki, et al: "By using the multilayer/multi-module approach using either small-diameter nano-ibers with small basis weight in the modules, or large-diameter nano-ibers with large basis weight in the modules, high-performance charged nano iber ilters have been developed that achieve over 90% capture of airborne COVID-19 simulated by the 100nm sodium chloride-aerosols. If the coronavirus is negatively charged, the positively charged PVDF nano iber ilter will provide even higher capture ef iciency as well by Coulomb attraction" [4].    docking site, the cationic-ligands should be preferred, or the peptides with the speci ic charge distribution.
A precise binding of the RBD with the ligand also require the other types of physical-interactions, mainly hydrogen bonding, dominating the total binding energy. In a case II, considering the possible inhibition of prefusion, the negative charge of amino acid AA residues may be in pairs associated with extracellular Ca 2+ cations in the vicinity of the cell membrane surface, and thus partially neutralized. Amino-acids with not compensated positive charge, located relatively closer to the cell -membrane, can be electrostatically attracted towards extracellular membrane lea let, and inally mechanically compress the cell membrane, changing the phospholipids order.
The electric-ield near the extracellular-surface driving positive + charges towards the cell surface is predicted by the total summary model, Goldman/Hodgkin/Katz Donnan/ Nernst-Ohki. Thus, inhibiting small anionic ligands for FP should be preferred.
And from Wallace Woon Fong Leung and Qiang qiang Sun: Capture ef iciency for single-layer ilters with different iber diameters.
"We examine the added effect of electrostatically charged ibers with different iber diameters.
Breakdown of ef iciency due to mechanical-diffusion plus interception and electrostatic effect for different nano iberdiameters for a single layer with 0.191 gsm, the difference between these two curves with the same iber -diameter represents only the electrostatic capture for a given aerosol size. Electrostatic-effect contributed much higher ef iciency. This is in as much as 30% absolute and 100% on relative basis for a given iber diameter" [4]. K Sholanov: "For further analysis of virus electricalproperties, an import role belong to the research results of scientists believing that genome of COVID-19 germ is recombinant (hybrid) virus composed of the SARS-CoV-2 virus and the second one that has ho equivalents. In this case, before entering human -body COVID-19 germ can be considered as impurity bio-polymer consisting of aliovalent molecules. This creates conditions for the emergence of electrical conductivity properties in the polymer as a consequence of the emergence of free electrostatic-charges. One method of creating conductive polymers is formation of a molecular-complex with chargetransfer between molecules forming impurity.
Depending on the structure of the components, different arrangement of hybrid virus-molecules is possible. It can be assumed that donors and acceptors form separate RNAchains. Donor-groups increase the cations number and acceptor-groups increase the anions number. Thus, impurity bio-polymer acquires an electrostatic-charge. The presence of virus electrostatic-charge is con irmed by some observations researchers from NIH, CDC, UCLA and Princeton-University found that the virus is stable during different periods in the aerosol and on the surfaces of different-materials.
Although, the experiments in question were performed by the researchers for other purposes, results of these experiments can be considered in terms of contact -electri ication of the virus by various bodies. It is known that during the contact-electri ication, double electric-layer is formed with different potential of surface-charges. Charge transfer between contacting-bodies ends when the intensity value caused by the ield becomes equal to the ield value conditioned by the difference between the activities of the output of contacting materials charged -particles. If the virus does not have an electric -charge, then it would be stable for a long time in all materials. Duration of charged particles exit from the hybrid -virus is determined by the difference in band structure of the contacting-body. The presence of a charge in the COVID19 virus germ assumes that there exists the next transfer mechanism: due to the emergence of the potential difference between human-body and the virus, the ionizedvirus is attracted to human -body surface and then enters human body.
High contagiousness of COVID-19 can be explained by the presence of the transfer mechanism of the virus that uses air ions. Air -ions are generated by air -ionization. At the same  time, the negative air-ions are mostly created by oxygen, and the positive ones are mostly created by carbonic acid-gases. Air ions interact and link up viral ions with opposite signs, and form agglomerate of COVID-19 viruses in the air, which predominantly via respiratory-system get into the lungs. This explains the reasons of extreme contagiousness of the COVID-19 virus.
A natural question arises on how air is ionized. Special devices are used to ionize air, although in this case for the ionization on a global scale it is possible to use long-wave ultraviolet-radiation (315-400 nm).For such UV-radiation formed, by an arti icial -satellite, the ozone -screen of the Earth is not an obstacle. Thus, virus and air ions agglomerate formed by UV-radiation from the arti icial satellite using, perhaps, laser equipment may cause large-scale coverage of COVID-19 population all over the planet.
Experience has shown that the disease is not always transmitted from person to person, the disease often appears in a person spending time-outdoors, which is due to inhalation of virus-agglomerate. At the same time, concentration of the agglomerate can be varied by varying the degree of airionization" [5].
From preprint Wei Li: "Among the four COVID-19 Coronavirus-related structures, three were determined using X-ray crystallography and one using electron-microscopy (PDB ID:6VSB) After the four structures were accessed and downloaded directly from the PDB website, a comprehensive set of salt bridging analysis was carried out as described in previously.
No hydrogen bonding network analysis was carried out here because usually hydrogen atoms are missing from experimentally determined bio-molecular structures solved using X-ray crystallography. With the electrostatic analysis as described previously in, this article puts forward a comprehensive set of electrostatic-interaction features for the four COVID-19 coronavirus-related structures as of March 4, 2020, all included as a large set of separate tables in the supplementary ile supplementary.pdf, including speci ically: No side chain or main chain hydrogen-bond was structurally identi ied for the four COVID-19 coronavirusrelated structures, as shown in supplementary ile supplementary.pdf For the irst time, this article reports a comprehensive set of electrostatic-features sucked out of the currently available COVID-19 coronavirus-related structures inside PDB in both PDF format and also LATEX format, i.e., a series of machine-readable -importable and -analyzable.
In supplementary ile scan.zip, a simple python-based analysis tool and a LATEX-based editing tool were included to extract and summarize the electrostatic -features from experimentally determined structures, where a set of PDB iles (representing experimentally determined protein structures) are to be plugged into a set of python-scripts included in cmd.py. Afterwards, cmd.py is to be executed with a simple command (python cmd.py) on a Linux machine terminal to produce the inal supplementary ile supplementary.pdf, summarizing the structurally observed electrostatic-features of the four COVID-19 coronavirus-related experimental structures as of March 4, 2020.
Along with the python-based analysis tool and a LATEXbased editing tool, the structurally observed electrostaticfeatures of the four COVID-19 coronavirus-related experimental structures constitute a preliminary starting point pointing towards a clear, coherent and comprehensive map of COVID-19's structure and function and also machinelearning and structure-based computationa-l design of neutralizing antibodies and/or small molecule(s) as potential therapeutic candidates against future outbreaks of the COVID-19 coronavirus -diseases" [6]. Jeffrey Baron, e t al: "Bronchiolitis, an infection of the lower respiratory-tract, is the leading cause of infant and child hospitalization in the United States US. Therapeutic options for management of bronchiolitis are limited. Hypertonic saline inhalation -therapy has been studied in numerous clinical trials with mixed results. In 2014, the American Academy of Pediatrics (AAP) published updated guidelines on the diagnosis and management of bronchiolitis, which include new recommendations on the use of hypertonic -saline. We reviewed all published clinical trials mentioned in the 2014 AAP guidelines, as well as additional trials published since the guidelines, and critically evaluated each trial to determine ef icacy, safety, and expectations of hypertonic-saline inhalation therapy. A total of 2682 infants were studied over the course of 22 clinical trials. Nine trials were carried out in the outpatient/clinic/emergency department and 13 in the inpatient setting. We agree with the AAP guidelines regarding the recommendation to use nebulized hypertonic -saline for infants hospitalized with bronchiolitis, with the expectation of reducing bronchiolitis scores and length of stay when it is expected to last more than 72 hours. We also believe there might be an advantage for hypertonic saline in reducing admission -rates from the emergency department, based on close examination of the results of recent trials. This review also highlights important gaps in the available literature that need to be addressed in order to de ine the role of inhaled hypertonic-saline therapy" [8].
Irina V Biktasheva: "Transient local over-dry environment might be a contributor and an explanation for the observed asynchronous local rises in Covid-19 mortality. We propose that a habitat's air-humidity negatively correlate with COVID-19 morbidity and mortality, and support this hypothesis on the example of publicly available data from German federal -states" [9].
"The virus SARS-CoV-2 is termed due to of its genome sequence similarity to SARS Coronavirus (SARS-CoV). The CoVs belong to the same genus Beta -coronavirus, sharing similar morphology in the form of enveloped, positive singlestranded RNA viruses. These viruses can be deactivated by certain lipid-solvents such as ethanol, ether (75%), chlorine-containing disinfectants, and chloroform, except chlorhexidine. Ethyl alcohol, at concentrations of 60%-80%, is a potent viricidal agent inactivating all the lipophilic viruses (in luenza, herpes, vaccinia virus) and many hydrophilicviruses (adenovirus, enterovirus, rhinovirus, and rotaviruses but not hepatitis A virus (HAV) or poliovirus)" [10].

Experimental project hypotesys
In order to verify the effect of modify the ionic forces in interface of an animal virus model it is interesting to use 2 different experimental condition: Model A normal condition: respiratory virus and its bindigns on pulmonary epithelial cells Mode B alternated condition: respiratory virus and its bindig under effect of different substantia that can modify the distribution of electrical charges in the interface virusepithelial cells.
The substantie used must to be not so toxic for the epithelial cell.

Time of observation: basal time and after 2 hours.
Endpoint: respiratory disease: yes or no (clinical and instrumental).

Kind of subministration: by aeresosl .
Kind of molecules studied: various mechanism of action but able to modify electrical charge pattern in virus surface.
Ethical consideration: under all international rules.

Discussion
Related the literature reported it is possible to say that: The viral surface is relevant t phenomena like transmissibility, airborne characteristics, bind with pulmonary epithelial cells, link whit PM particlate matter and also to the severity of the disease.   was estimated by calculating the impurities inside a de ined volume by observing the change in electrical -parameters. Empirically, the virus count was similar to the absolute value of the ratio of the change of the virus suspension dopant concentration relative to the mock dopant over the change in virus-suspension Debye volume relative to mock Debye volume. The virus type was identi ied by constructing a concentration-mobility relationship which is unique for each kind of virus, allowing for a fast (within minutes) and labelfree virus quanti ication and identi ication. For validation, the HIV and FIV virus preparations were further quanti ied by a bio-chemical technique and the results obtained by both approaches corroborated well. We further demonstrate that the electrical-technique could be applied to accurately measure and characterize silica-nanoparticles that resemble the virus particles in size. Based on these results, we anticipate our present approach to be a starting point towards establishing the foundation for label-free electrical-based identi ication and quanti ication of an unlimited number of viruses and other nano-sized particles. the methodology presented here is a basic attempt to demonstrate and explore the use of a new technique for virus-detection, classi ication and identi ication. The outlined technique should be applicable to any type of virus, provided it can be electrically-polarized, as well as other types of particles in suspended solutions" [12].
Robert I Mac Cuspie, et al: Capacitances of 5 types of viruses, adenovirus type 5 (AV 5) herpes simplex virus type 1 (HSV1), simian virus 40 (SV40), vaccinia (MVA), and cowpea mosaic-virus (CPMV) were compared by AC capacitance scanning probe microscopy. This technique, using a Pt-coated AFM tip as an electrode to probe capacitance of materials between the tip and a bottom-electrode, has been applied to study surface structures of semiconductors and polymers with nanometer spacial resolution, biological samples at the nanoscale have not been explored by this technique yet. Because most biological-cells are poor conductors, this approach to probe electric properties of cells by capacitance is logical. This scanning probe-technique (SPM) showed that all of these viruses have distinguishable and characteristic capacitances, respectively. Series of control experiments were carried out using mutant-viruses in order to validate the origin of the characteristic capacitance responses for different viruses.
A mutation on the capsid in HSV1 virus with green luorescence-proteins (GFP) increased capacitance from 9×10−6 F/cm2 to 1×10−5 F/cm2 at the frequency of 104 Hz. HSV2 virus decreased capacitance when its envelope and glycoproteins were chemically-extracted. These control experiments indicate that dielectric properties of capsid proteins and envelope glycoproteins signi icantly in luence overall dielectric constants of viruses. Because those capsid proteins and glycoproteins are characteristic to the virusstrain, this technique could be applied to detect and identify viruses at the single viron-level using their distinct capacitance spectra as ingerprints without labeling [13].
Eric M Kettleson, et al: "Airbo rne-virus capture and inactivation were studied in an electrostatic -precipitator (ESP) at applied voltages from -10 to +10 kV using aerosolized bacteriophages T3 and MS2. For each charging scenario, samples were collected from the ef luent air stream and assayed for viable phages using plaque assays and for nucleic acids using quantitative polymerase chain -reaction (qPCR) assays. At higher applied voltages, more virus particles were captured from air with maximum-log reductions of 6.8 and 6.3 for the plaque assay and 4.2 and 3.5 for the qPCR assay at -10 kV for T3 and MS2, respectively.
Beyond corona inception (at applied voltages of -10, -8, +8, and +10 kV), log reduction values obtained with the plaque assay were much higher compared to those of the qPCR assay because nonviable particles, while present in the ef luent, were un accounted for in the plaque -assay. Comparisons.
Of these assays showed that in-light inactivation (inactivation without capture) was greater for the highest applied voltages with a log inactivation of 2.6 for both phages at -10 kV.
We have demonstrated great potential for virus -capture and inactivation via continual ion and reactive species bombardment when conditions in the ESP are enforced to generate a corona discharge" [14].
Christin Scheller, et al: "The isoelectric -point (abbreviated by pI or IEP) is the pH value at which a molecule's or biocolloid's net charge is zero. The latter includes viruses, which can form different surface charges, depending on the pH. Information about the isoelectric-point is important because the solubility and electrical repulsion are lowest at the pI. the tendency to aggregation and precipitation is highest. In the case of viruses, the value thus provides information about the viral Figure 9: Capacitance -spectra of (a) polystyrene (□) and PMMA (▲) nanoparticles (b) Capacitance spectra of AV5, CPMV, MVA, SV40, and HSV1 (c) HSV1 with the tip forces, 50 nN (▶), 200 nN (□), and 500 nN (○) (d) HSV1 at humidity -level 10% (△), 50% (○), and 70% (▼).shows capacitances of fi ve types of viruses; adenovirus type 5 (AV 5), herpes simplex-virus type 1 (HSV1), simian virus 40 (SV40), vaccinia (MVA), and cowpea mosaic virus -(CPMV). Their impedance signals were averaged 1-10 seconds for each AC frequency at 10 mV of AC bias. For each type of virus, fi fty diff erent particles were measured and collected capacitance-spectra were averaged with error bars and normalized by the size of each virus, as shown in Figure (b). In this fi gure, SV40 showed the highest capacitance while AV5 had the lowest.
surface charge in a speci ic environment. Michen and Graule authored a review on isoelectric-points of viruses in which they evaluated 137 pI measurements of 104 viruses. Their evaluation shows that the isoelectric-points (IEP) of viruses range from 1.9 to 8.4, but can mostly be found between 3.5 and 7, which means that viruses with pI values in the strongly basic range have not yet been described.
They offer various attempts to explain the variations found in single-virus species data. Key propositions are that viruses can have more than one pI and that the pI value depends on the electrolyte-conditions to which they are exposed. Dependencies of charge states, and thus, pI values, on the presence of metal ions (for example) have been frequently observed. At present, no experimental data are available for the pI value of SARS-CoV-2 or its structural, nonstructural, or accessory-proteins. An estimation is possible through predictive calculations with, in example, the ProtParam tool by ExPASy. The calculation results for the physico-chemical properties and the molecular weight of the individual proteins are based on the corresponding amino acid sequences from UniProt" [15].
"The (pKa)s of the protein on the surface: At the isoelectric -point of a protein, there is an equivalent distribution of negative and positive-charges, leading to a neutral response to a potential difference. If the pH be lowered from the isoelectric -point, it is found that, a bias is created towards the centre of positive charge of the protein. The pKa's could be derived from the pH values of the titration curve for the S(spike)-protein of the SARS-CoV-2 using the Henderson-Hasselbalch equation (from titration analysis): pH = pKa + log ([conjugate base]/[weak acid]) To establish this concept of the in luence of surrounding pH on the surfacecharge of a virus, similar experiments had already been carried out also over the other virus strains. It should be considered here that the S-protein in the spikes of the coronavirus is essentially a complex folded structure of a chain formed from the the S gene that comprises an ORF encoding a protein of 1353 amino acid-residues, with a predicted molecular weight of 149,918 (S Mounir 1, P Labonté, P J Talbot).
It tends to have different charge accumulations and con igurations in different pH levels of the surroundings, unlike simple inorganic-particles of aerosols. A three layer mask can be produced to prevent the immediate infections of DNA, RNA viruses including SARS-COV-2 and others because the electric-charge accumulation of the RNA viruses is much less than the electrostatic charges accumulated in the layers of the mask within few minutes. In the inner surface, a cotton type non-conducting material can be used which will work basically as a nonconductor so that the electrostatic -charges produced inside the two layers does not drain out through surface of the (human)body" [16]. By the use of a modi ied ionizer-device we describe effective prevention of airborne transmitted in luenza-A (strain Panama 99) virus infection between animals and inactivation of virus (> 97%). Active ionizer prevented 100% (4/4) of guinea -pigs from infection. the device effectively captured airborne transmitted calicivirus, rotavirus and in luenza-virus, with recovery rates up to 21% after 40 min in a 19 m3 room. The ionizer generates negative-ions, rendering airborne-particles/aerosol droplets negatively charged and electrostatically attracts them to a positively charged collector plate. Trapped viruses are then identi ied by reverse transcription quantitative real-time PCR. The device enables unique possibilities for rapid and simple removal of virus from air and offers possibilities to simultaneously identify and prevent airborne-transmission of viruses. Inactivation of viruses by electrostatic attraction has only been brie ly investigated. In the present study, rotavirus and CaCV lost signi icant (> 97%) infectivity (ratio; CaCV from 3.0 × 10−2 to < 7.8 × 10−4 and rotavirus from 4.9 × 10−1 to < 7.6 × 10−3) in ionized-air as determined by a ratio of infectivity versus gene -copies. The ionizer creates electrons, which will render surface molecules of particles in air negatively -charged thus attracting them to the positively charged collector plate. This device generates approximately 35 000 billion electrons per second with a steady-state ozone concentration below the detection limit (0,002 ppm) as tested by VTT Technical Research Center of Finland, Tampere" [17].
An isoelectric point is the point at which a particular molecule carries no net electric -charge. Thus at isoelectricpoint the total positive and negative charges are same and the molecule is overall neutral. If a protein has more number of acidic amino -acids, the isoelectric -point will be at low pH while a protein with more number of basic amino acids will have isoelectric point at high pH.
Lin L, et al: "Electrostatic -features, including electrostatic potential, electric -ield lines, and electrostatic forces of SARS-CoV and SARS-CoV-2 were calculated and compared in detail. The results demonstrate that SARS-CoV and SARS-CoV-2 S proteins are both attractive to ACE2 by electrostatic forces even at different distances. the residues contributing to the electrostatic-features are quite different due to the mutations between SARS-CoV S protein and SARS-CoV-2 S protein. Such differences are analyzed comprehensively" [19].
Red represents residues which are mutated to be more negative; Blue represents residues which are mutated to be more positive; yellow represents residues which are mutated from polar to hydrophobic; cyan represents residues which are mutated from hydrophobic to polar. (B) Structure of a single S protein monomer. The RBD shown in red circle is lipping out to reach ACE2. The green circle-region highlights the hinge between RBD and the rest of S protein.
Zhi-Yong Wang, et al: "Bronchiolitis, a common lowe r respiratory-tract infection in infants, is the primary reason of hospitalization of infants in developed and developing -countries (1). This disease is characterized by wheezing, cough and tachypnea. Cases mostly present among the infants aged 1-6 months. It usually occurs in early spring and winter seasons.
"It is estimated that 1 in 5 infants each year suffers respiratory-infection caused by respiratory syncytial virus (RSV) (3). The mortality rate is 0.5% -1.5% among hospitalized infants, but increases to 3-4% for infants with potential pulmonary or cardiac-diseases.
A meta-analysis was performed to analyze the ef icacy of 3% hypertonic -saline (HS) in bronchiolitis. Pubmed and MEDLINE databases were searched for relevant articles. A total of 2 authors selected the articles according to the inclusion criteria and then data were carefully extracted. Weighted mean difference (WMD) with 95% con idence interval (95% CI) values were used to pool continuous data, including length of stay and clinical severity-score (CSS). Relative-risk (RR) with 95% CI was calculated to determine the association between 3% HS and re-admission. The pooled data revealed that infants treated with 3% HS exhibited shorter durations of hospitalization compared with those treated with normal-saline (NS; WMD =−0.43; 95% CI = −0.70, −0.15). Subgroup -analysis examining the combination of HS or NS with additional medication demonstrated that 3% HS with epinephrine signi icantly decreased the length of hospital stay, with a WMD =−0.62 (95% CI =−0.90, −0.33). The results indicated a lower CSS score in the 3% HS group compared with the NS group (SMD =−0.80; 95% CI =−1.06, −0.54). The pooled outcome indicated a bene icial effect of 3% HS on decreasing re-admission rates compared with NS (RR = 0.93; 95% CI = 0.70, 1.23). No potential publication-bias was observed (Begg's, p = 0.133; Egger's, p = 0.576). In conclusion, 3% HS was demonstrated to be a more successful therapy compared with NS for infants with bronchiolitis" [20]. C M Schaldach, et al: "The in luence of ionic strength on the electrostatic -interaction of viruses with environmentally relevant surfaces was determined for three viruses, MS2, Q beta, and Norwalk. The virus is modeled as a particle comprised of ionizable amino acid-residues in a shell surrounding a spherical RNA core of negative charge, these charges being compensated for by a Coulomb screening due to intercalated ions. A second model of the virus involving surface charges only is included for comparison. Surface potential calculations for each of the viruses show excellent agreement with electrophoretic-mobility and zeta potential measurements as a function of pH. The environmental-surface is modeled as a homogeneous plane held at constant potential with and without a inite region (patch) of opposite potential. The results indicate that the electrostatic-interaction between the virus and the oppositely-charged patch is signi icantly in luenced by the conditions of ionic strength, pH and size of the patch. Speci ically, at pH 7, the Norwalk -virus interacts more strongly with the patch than MS2 (approximately 51 vs. approximately 9kT) but at pH 5, the Norwalk-surface interaction is negligible while that of MS2 is approximately 5.9kT. The resulting rami ications for the use of MS2 as a surrogate for Norwalk are discussed" [21]. Preprint: Rafael RG. Machado et al: "We performed experiments to test if hypertonic saline solution is able to inhibit virus-replication in vitro. Our data shows that 260 mM NaCl (1.5%) inhibits 100% SARS-CoV-2 replication in Vero cells. our results suggest that the virus replication inhibition is due to an intracellular -mechanism and not due to the dissociation between spike SARS-CoV-2 protein and its humanreceptor angiotensin-converting enzyme 2 interaction. NaCl depolarizes the plasma membrane supposedly associated with the inhibition of the SARS-CoV-2 life cycle.
This observation could lead to simple, safe and low cost interventions at various stages of COVID-19 treatment, improving the prognosis of infected-patients, thereby mitigating the social and economic costs of the pandemic" [22]. "Salts affect protein stability in 2different ways. At lowconcentrations, ions interact with proteins via nonspeci ic electrostatic-interactions. This electrostatic neutralization of protein charges usually stabilizes protein structure. Complete charge neutralization by ions occurs at or below 0.2 M ionic strength and it is independent of the nature of the salt. At higher-concentrations (>1 M), salts have ion speci ic effects that in luence the structural -stability of proteins."

Conclusion
Related the literature reported it is interesting to submit to the researcher that it is possible acts on the Electrical distribution of a respiratory virus surface.
This modulation can help in various stage of the pathogenetic process since form the binding with the ACE receptor, to the cellular intake.
Is I reported the effect of hypertonic saline solution in aerosols as medium that can modify this equilibrium.
In some example of pediatric disease reducing the days of pathologic condition. This is a simply example able to show as modifying the microenvironment in the interface whit an aerosolized ionic substantia this can create an unfavorable situation for virus cellular intake.
Hypertonic saline solution aerosol show more ef icacy the normal saline and this is the proof that the; Increase Ionic force is crucial for the effect.
Adding the salts increase ionic forces.
Can we use other substantie for the same scope and more effective acting on micro environmental factors like ionic forces, osmotic level, PH and other affecting the global protein structure?
Ethical consideration: Under all international rules.
Clari ication this work is produced whit out any diagnostic or therapeutic intent only to submit to researcher hypothesis of work.