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Explore 66,105 preprints on the Authorea Preprint Repository

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Probiotics in viral infections, with a focus on COVID-19: A Systematic Review
Meraj  Pourhossein

Meraj Pourhossein

May 13, 2020
COVID-19, a newly discovered virus disease, can be affected by probiotics. So, we tried to review the possible effects and associations of probiotics on viral infections focusing on SARS-CoV-2. We searched on PubMed, EMBASE, Google Scholar, Science Direct, Scopus and Web of Science up to May 2020 to identify interventional & observational studies documenting the effects of probiotics strains on interleukins, virus titres, and antibody production with a focus on confirmed diagnosis of SARS-CoV-2 infection. From a total of 93 records, 21 studies were obtained and classified into three domains based on the efficacy of probiotics on 1)the level of interleukins (n=7), 2)virus titres reduction (n=2), and 3)antibody production (n=12). The suppuration of proinflammatory interleukins and type I interferon (IFN) production seemed to be the main anti-viral strategy of probiotics. Based on evidence, some probiotic strains may be useful in SARS-CoV-2 infection; randomized trials are needed to confirm these findings.
Long Segmenter Reconstruction of Diffusely Diseased of The Left Anterior Descending A...
SALIH FEHMI KATIRCIOGLU
Hasan Attila Keskin

SALIH FEHMI KATIRCIOGLU

and 3 more

May 13, 2020
In this case report we described the results in a patient whose left anterior descending coronary artery (LAD) was totally occluded. We revascularized the patient with diffuse atherosclerosis in LAD only by performing endarterectomy without CABG. We think that this method may be an alternative technique to conventional revascularization in LAD diffuse atherosclerosis
Cold agglutinin disease following SARS-CoV-2 and Mycoplasma pneumoniae co-infections
Chatphatai Moonla
Phandee Watanaboonyongcharoen

Chatphatai Moonla

and 8 more

May 13, 2020
During coronavirus disease 2019 (COVID-19) pandemic, coinfections with other viral infections are not uncommon, but concomitant atypical bacteria are rare. Herein, we describe a young female COVID-19 patient who developed acute cold agglutinin disease secondary to Mycoplasma pneumoniae. Using an azithromycin-containing COVID-19 therapeutic regimen, both pneumonia and anemia resolved uneventfully.
Portal Hypertension: An Uncommon Presentation of Caroli’s Syndrome
Akash Raut
Suraj Shrestha

Akash Raut

and 4 more

May 13, 2020
Portal Hypertension is not a classical presentation of Caroli's Syndrome. However, some young children can present with overt signs and symptoms indicative of advanced disease state despite the improvement in imaging technology which has decreased its diagnostic age. High index of clinical suspicion can help in timely diagnosis and management
A case LGL leukemia with paucity of erythropoiesis.
Habib Moshref Razavi

Habib Moshref Razavi

May 13, 2020
A 63 year old patient with chronic lymphocytosis and neutropenia is described. A bone marrow biopsy showed a markedly hypercellular specimen with an interstitial and intrasinusoidal lymphoid infiltrate. Immunohistochemistry and immunophenotyping identified these as LGLs. With paucity of erythropoiesis diagnosis of LGL leukemia with pure red cell aplasia is reached.
Roe deer on ice: selection despite limited effective population size through the Plei...
Alana Alexander
Ludovic Dutoit

Alana Alexander

and 1 more

May 13, 2020
Roe deer (Capreolus spp.) are a little odd. They are one of only a few placental mammals — and the only genus among even-toed ungulates — capable of putting embryonic development “on ice”, also known as embryonic diapause (Fig. 1). It would seem such an unusual trait is likely the product of natural selection, but a big question is, how does selection for important traits, such as diapause, interact with the historical demography of a species? In a ‘From the Cover’ article in this issue of Molecular Ecology, de Jong et al. (2020) demonstrate that selection is acting on genes associated with reproductive biology in roe deer, despite heightened genetic drift due to reduced effective population size through the Pleistocene.
Unusual presentation of a large glomus tympanicum with a coexisting cholesteatoma
Kartike Gulati

Kartike Gulati

May 19, 2020
The objective of this study is to increase awareness of a rare and atypical presentation of a large glomus tympanicum coexisting with a cholesteatoma in a patient who presented with infectious otorrhea and sensorineural hearing loss.
NLO properties and spectroscopic characterization of Y-shaped polymer using quantum c...
Mahadevappa Naganathappa
Ajay Chaudhari

Mahadevappa Naganathappa

and 3 more

May 13, 2020
The present study reports nonlinear optical properties such as first and second hyper polarizabilities (β and γ) of Y-shaped polymer (P1) and substituted polymers. The basic Y-shaped polymer (R=R1=H) named as P1. Upon substitution of one OCH3 group in ortho position of Oxygen becomes polymer P2 (R1=H, R=OCH3) and two OCH3 group as P3 (R1=R=OCH3). We have also reported structural parameters, vibrational and electronic absorption spectra of polymer and substituted using quantum chemical methods. The geometrical parameters such as dipole moment, bond length and angles are reported at B3LYP/6-311++g** level of theory. In addition, the vibrational, electronic absorption spectra and NLO properties are also reported at the same level of theory. There is significant change in dipole moment and energy observed whereas symmetry, bond length and angles are resembling in Y-shaped and substituted polymer. The vibrational spectra of Y-shaped polymer (P1) having the intense peak is C-H stretching mode observed at 1258 cm-1. These Theoretical vibrational modes are well matching with available experimental determinations. The method dependent and the along the X, Y and Z-direction hyperpolarizabilites also reported. This study confirms the polymer P1 and P2 showing first and second hyperpolarizability response whereas P3 do not show. The electronic absorption spectra for polymer and substituted polymers are also reported at the same level of theory using (TDDFT) approach. The wavelength of electronic transition, oscillator strength and HOMO-LUMO gap also reported.
Patterns of nitrate transport in an agricultural watershed through consecutive dry ye...
shuai chen
Xiaohong RUAN

shuai chen

and 1 more

May 13, 2020
Recently, because of regional climate changes and human activities, the risk and intensity of droughts in the upper and middle Huaihe River Basin, China, have increased. These changes in rainfall may have, in turn, had an influence on the pathways of nitrate transport in this predominantly agricultural watershed. In this study, the characteristics of nitrate transport over consecutive dry years in this watershed were examined using records of streamflow and nitrate concentration data that spanned a period of 12 years (2007-2018) that included 3 consecutive dry years (2011–2013). The baseflow was separated from the streamflow using a digital filter method and the nitrate loads were estimated using a regression method. The annual discharge and nitrate load in streamflow and baseflow averaged 23.5 billion m3 and 41.9 kiloton (kt), and 7.4 billion m3 and 14.7 kt, respectively. Baseflow contributed more to the total discharge and total nitrate load in the consecutive dry years (41.0% of the total discharge and 56.2% of the total nitrate load) than in wet, normal, and single dry years. Averaged over the whole study period, the monthly baseflow nitrate index (BFNI) was higher than 50% in the dry season and lower than 30% in the flood season. Over the study period, the annual baseflow enrichment ratio (BER) ranged from 0.94 to 1.46 and averaged 1.13, and was highest (1.46) in the consecutive dry years. The results suggest that nitrate was mainly transported to surface water via baseflow during dry conditions and that this process was particularly important during the consecutive dry years. Therefore, to protect surface water, measures should be urgently implemented to control nitrate transport in groundwater during consecutive dry years.
Review: "A Comparison of Quantum and Traditional Fourier Transform Computations"
Matthias Troyer

Matthias Troyer

August 20, 2020
The manuscript "A Comparison of Quantum and Traditional Fourier Transform Computations" discusses a very important and often overlooked aspect of quantum computing, namely a fair and detailed comparison of a quantum algorithm, its classical simulation, and its classical counterpart taking into account the complexity of I/O. Such an article is valuable and worth publishing. The current manuscript, however, still contains some inaccuracies that should be fixed and I will make suggestion on how the presentation can be improved.Let me first summarize the main result in my own words: a quantum Fourier transform (QFT) can calculate the Fourier transform of a vector with time complexity \(O\left(\log^2N\right)\), compared to the complexity \(O\left(N\log N\right)\) of a classical FFT. However, if one needs to read out the full vector instead, the complexity becomes \(O\left(N \text{ polylog}(N) \right)\) again, without an advantage over the classical algorithm. It is actually worse than the author discusses, if one also takes into account the complexity of loading the initial state. Loading an initial classical data vector has complexity \(O\left(N\right)\), and this has to be repeated at every repetition, giving a complexity of \(O\left(N^2\ \text{polylog}\ N\right)\), worse than classical. As the author correctly mentions, the QFT is thus a useful algorithm if the input data is prepared algorithmically, and limited sampling of the result vector is sufficient, as is the case for Shor's algorithm.This is a valuable observation that deserves a paper in CiSE, since these important considerations are not all known to people outside the quantum computing community, and are sometimes  ignored even by quantum computing specialists. I thus want to encourage the author to improve the presentation to make it more accessible to a broader audience and fix a couple of technical flaws.Before discussing presentation issues, I want to address one technical flaw and a few points where more clarity is needed: This statement towards the end is too simplistic and needs to be clarified: "...  if we want to measure each coefficient, we must redo our operations for each coefficient (since our wave function will collapse for every measurement)." The manuscript does not explain how to read out a specific coefficient. If one samples the wave function, one measures the result and gets a certain value \((s_1, \cdots,\ s_N)\) with a probability depending on the wave function. More complex amplitude-estimation algorithms are needed to read out specific coefficients, which then takes time \(O(N/\epsilon)\). This needs to be better explained.  This also raises another issue of normalization and precision. The quantum wave function has to be normalized to have an \(L_2\) norm of \(1\). We thus need to measure to a precision of epsilon divided by the \(L_2\) norm of the classical data, and if that increases with \(N\) the scaling is even worse. For example, if all entries are of order unity, the \(L_2\) norm is \(\sqrt{N}\). The one technical flaw in the paper is in preparing the input state to the QFT, and the complexity of the classical simulation of the quantum algorithm.  There, the numbers are wrong. The classical complexity can easily be estimated by realizing that any sparse quantum gate (such as a 1-qubit or 1-qubit gate) can be simulated in time \(O(N)=O(2^n)\), where \(N=2^n\). Thus, the overhead is just \(O(N)\), not \(O(N^2)\), and the simulation complexity is just \(O(N)\) times the complexity of the quantum algorithm. This will be more apparent if, as I propose below, the author shows the quantum algorithm also through a sequence of quantum gates. However, note that in the simulation we then have the full vector, and thus do not incur the overhead of quantum state tomography. We need to simulate the algorithm only once and not \(O(N/\epsilon)\) times. This means the simulation remains at \(O(N\ \log^2{N})\) even if we read out all entries, which is not bad compared to the classical \(O(N\ \log{N})\) of the FFT. The reason why the author seems to end with a different complexity is that his Matlab simulation does not simulate the quantum algorithm but the computation of the effect of the QFT applied to just one basis state. That is a suboptimal implementation. I thus propose to replace the Matlab code by a discussion of how a quantum gate (Hadamard or controlled phase rotation) can be implemented, and that will then nicely give the scaling discussed above.As mentioned in my summary at the beginning, the value of the paper can be increased if the author could also discuss the complexity of quantum state preparation from classical input data, e.g., following Shende-Bullock-Markov \citep{markov2006}, which has a complexity of \(O\left(N\ \log\ \frac{1}{\epsilon}\right)\). That means, that if the data is read from a classical vector (and not computed as, e.g., in Shor's algorithm), then the complexity of state preparation of  \(O\left(N\ \log\ \frac{1}{\epsilon}\right)\) completely dominates the QFT itself, and if one furthermore wants to read out the full vector instead of sampling it, the complexity becomes \(O\left(N^2\log^2\left(\frac{1}{\epsilon}\right)\right)\).In the conclusion the author writes that "QEC research is still in very early development and it is currently difficult to determine how the required resources for these corrections could scale with qubit usage." That is incorrect, as the overhead is pretty well known by now for certain QEC codes, such as the surface code. The asymptotic scaling of the overhead has long been known, and also detailed resource costs have been worked out for various algorithms. I suggest to focus the QEC section on the need for fault tolerance, and the large overhead associated with it. This is definitely not something that can be done on NISQ devices at an interesting scale. I would also use another reference for QEC than the Gil Kalai paper.Now, to suggestions for improved presentation:In the abstract, I suggest to present fewer technical details. "radix-2 DIT case of the Cooley-Tukey Algorithm" can just be called Fast Fourier transform,  the QUBIT4MATLAB package does not need to be mentioned in the abstract, and neither does the "Master Theorem" have to be mentioned.In the abstract and in the rest of the paper, it is also better to talk about quantum speedup and not quantum supremacy. The paper is about asymptotic scaling (the author uses the big-O notation throughout), and not about supremacy, which is a specific size problem that is solved better on quantum hardware rather than classical hardware. A supremacy claim needs all constants to be worked out, and assumptions for the specific classical and quantum hardware. Replacing quantum supremacy by quantum speedup can fix this. The observations are still valuable and correct.The first section is called "The shortcomings of classical computing and the early developments of quantum computing". That title sounds strange to me. What are the shortcomings? The author may rather want to stress the additional capabilities of quantum computers. Given that most readers will not be physicists and have no experience with quantum mechanics, it would be valuable to expand this first section. Discuss equation (3) before equation (1), and then introduce equation (1), to show that this means that the state of a qubit is actually a two-dimensional complex vector, After that only go to the many-quit state. After equation 4 it may be good to talk about amplitudes first, and then probabilities. Saying that the state is determined by "the qubit simply has a probability...", ignores the all important phases that are the crucial difference between quantum computing and probabilistic classical computing. "Quantum gates, unlike classical gates, do not delete information and are fully reversible." Needs further explanation. This comes from the reversibility of the microscopic laws of physics. Here it may be worthwhile to mention that, as quantum gates are time evolution of a quantum system, they are unitary operators on the Hilbert space that was introduced above. The discussion in the next sentence about them not using energy is misleading as well. In fact, the control and operation of the quantum gate always needs energy. It is only the free evolution of a quantum system that conserves energy. The part on " subatomic systems such as a superposition of quantum states. " would also need more explanation. Does the author here want to describe specific implementations of qubits? If so, more detail is needed. If not, I propose to drop this part."The definition and use of the classical discrete Fourier transform": here is an abrupt jump from Shor's algorithm to the DFT. Since Shor's algorithm again gets mentioned later on as a case where the QFT is better than a classical DFT, it make sense to discuss more details of Shor's algorithm, and that in essence it solvers the factor problem by using a QFT to find the period of a function. In light of the above complexity discussion this is important: we don't deal with classical data that one has to load but with a state that is computed (the function f(x) = a^x mod N ), and one is not interested in the full vector but just in finding the period. This can be done just by measuring the result of the QFT, which in this particular case will return a random multiple of the base frequency, and with a few repeated measurements one can then extract the period).The Fourier transform should be well known to the reader, and it is thus not obvious to me that equation 6 is needed. I would instead introduce \omega in equation 5. For the discussion of the implementation I suggest to mention that the rest of the paper limits itself to the case of powers of 2, i.e. N=2^n, for which the radix-2 version applies. Since the implementation is well known for most computational scientists, it could be moved from to supplementary material, as can be the derivation of the O(N log N) complexity, which is also well known.In the discussion of the QFT, unfortunately the quantum algorithm is not presented. What is presented is the mathematical unitary operation. It would be very valuable for the reader to see an actual implementation of the quantum algorithm, i.e. the sequence of O(n^2) Hadamard gates and controlled rotations – either as a circuit drawing, or more useful as quantum code, either using a quantum programming language that allows loops (such as Q#), or as some quantum pseudo code with loops. Then the reader will see the sequence of O(n^2) operations and how it creates the unitary operation of the QFT."The implementation of the QFT in MATLAB...". This section can be improved as well., As discussed above, the Matlab code does not implement the quantum algorithm but rather implements the application of the unitary operation to one of the basis states. It would be more useful for the reader to instead get implementations of the Hadamard and controlled phase gates, which could then be combined with the above quantum algorithm (maybe all in Matlab even?) for a full simulation of the algorithm – and in time O(N n^2), not O(N^2 n^2)."Evaluating the complexity of the QFT Implementation" – I discussed the issues with the complexity estimates already above. If one replaces it by an estimate of the complexity of simulating the H and controlled phase gate each in O(N) operations then it both becomes simpler and the complexity becomes just O(N) times that of the quantum version"Evaluating the complexity of the theoretical form of the QFT Implementation”. I assume that by "theoretical" the author means the actual quantum operation? The comparison section needs to be fixed, since that's where there is the mentioned flaw based on the suboptimal Matlab code, and that will also change table 1. I suggest that table 1 could have three cases: A) ignoring state preparation and one only wants to sample the output a constant number of times; B) ignoring state preparation but one wants to read the full vector; C) including state preparation from classical data and one only wants to sample the output a constant number of times; D) including state preparation from classical data and one wants to read the full vectorThe reader will then see that only case A has a speedup, and that in the other cases even the simulation of the quantum algorithm is faster than the quantum algorithm on a quantum computer.The conclusions should then be updated, taking these slightly modified comparisons into account. The case of Shor's algorithm, which falls into category A) above, is indeed interesting but deserves a deeper explanation so that the reader understands that Shor's algorithm can compute the input with complexity \(O\left(N^3\right)\) (up to log factors), and why only a few samples of the output are needed. That way, the exponential speedup over the FFT remains, and the super polynomial speedup over the name sieve. However, if classical data has to be loaded or should be returned then there is no speedup. I call this the I/O problem of quantum algorithms, which indeed—as the author writes—means that in these cases quantum computing is no better than classical computing.This is an important observation that the paper beautifully works out. Fixing the flaw in the simulation section and improving the presentation will make this a very nice paper.
Laser-assisted head and neck surgery in the COVID-19 pandemic: controversial evidence...
Head and Neck Editor

Oreste Gallo, MD

May 13, 2020
Oreste Gallo, MD; Luca Giovanni Locatello, MDDepartment of Otorhinolaryngology, Careggi University Hospital, Florence - Largo Brambilla, 3 - 50134 Florence, Italy* Corresponding author: Prof. Oreste Gallo, MD, Department of Otorhinolaryngology, Careggi University Hospital, Florence - Largo Brambilla, 3 - 50134 Firenze, Italy. +39 0557947989, oreste.gallo at unifi.itKeywords: COVID-19, laser-assisted surgery, surgical plume, prevention, surgical safetyAuthors’ contributions: Gallo: Conceptualization, supervision and writing - review and editing; Locatello: Conceptualization, resources, supervision, and writing - review and editing.Conflict of Interest: all authors declare they have nothing to disclose.This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors.Many of the safety issues related to the novel COVID-19 in our routine surgical practice were thoroughly presented in this Journal. [1] However, the authors did not discuss an important field of head and neck surgery: laser-assisted procedures. Historically, human-papillomavirus (HPV) in the setting of respiratory recurrent papillomatosis is the prototype of the biological hazards of the laser-generated surgical plume.[2] In the past, it was shown that surgical vaporization was capable to contaminate the staff’s personal protective equipment (PPE) with viable and infectious HPV virions. [2] Despite the growing evidence documenting a key role of high-risk HPV infections in the pathogenesis and development of head and neck cancer, the risk assessment of potential viral infection after exposure to laser plume is still controversial. [3] The biohazard might not be limited to HPV airborne transmission, but also other bacteria and viruses, including (possibly) SARS-CoV-2. For instance, Kwak et al. documented Hepatitis B (HBV) DNA in surgical smoke from 10 out of 11 HBV+ patients undergoing robotic laparoscopic surgery thus suggesting a potential risk of airborne HBV infection.[4] Heat-generating procedures by electrosurgical equipment or lasers can induce thermal disruption of viable human cells and they are able to aerosolize hazardous particles. The thermal effect of lasers on biological tissues is a complex process resulting from the conversion of light to heat whose effects depend upon several factors: the physical denaturation and/or destruction is a function of laser settings (wavelength, power, time and mode of emission, beam profile, and spot size) and the target of the procedure (thermal parameters, optical coefficient, etc.).[5,6] During ablative surgery, the tissue is heated by the absorbed laser energy and it evaporates or sublimates, while, at higher power, the tissue is typically converted to plasma. This means that during laser-tissue interaction aerosolized blood and interstitial and intracellular fluids, along with their possible burden of viral pathogens and hazardous chemicals are forcefully ejected in the operating room.[6] Nonetheless, controversies exist in the literature regarding efficient viral infection of healthcare staff after exposure to surgical smoke. [3,5,6]Surgical use of different types of lasers (CO2, Nd:YAG, KTP…) is common not only in the head and neck but also in gynecology, dermatology, and respiratory medicine among other fields. Even though there is a lack of conclusive data on plume-borne contamination, there is an urgent need to raise awareness of its risks during the COVID-19 pandemic. In the next years, our daily practice of transoral laser-assisted surgery, an incontournable strategy to treat several benign and malignant lesions of the upper aerodigestive tract with excellent oncological and functional results, is going to be deeply modified. High viral loads, especially in the nose and the pharynx, can be detected after symptom onset but general consensus exists on SARS-CoV-2 diffusion by droplet transmission even from asymptomatic individuals, therefore it is conceivable that every laser procedure is to be considered as high-risk.[7]While waiting for more robust specific evidence, we would like to recall some precautionary measures, inspired by the most recent literature,[8] that ought to be implemented for all laser-assisted procedures:Always discuss alternative therapeutic strategies in a multidisciplinary team and postpone laser therapy if it is not urgent;Perform RT-PCR test for detection of SARS-CoV-2 RNA before every procedure;During routine preoperative exams, non-enhanced chest computed tomography is reported to have a higher sensitivity for COVID-19 detection than RT-PCR;For small and easily accessible lesions, resection by cold instruments should be preferred;Laser surgery should be performed in an operating room with a highly efficient negative-pressure system;Sterilize laser handpieces after use and frequently change surgical gloves, especially after direct contact with the instrument;8. All the staff should wear highly protective PPE, including goggles and gloves and highly protective masks (i.e., N95) with gas adsorption filters;9. Disposable double plume evacuation systems with filters that remove particulates up to 0.1 microns (the so-called ULPA, ultra-low particulate air filters) should be available;10. Reduce the presence in the theater of all the unnecessary personnel and perform adequate training for all staff members to enhance awareness about the hazards of the surgical smoke in the COVID-19 outbreak.In this evolving context, head and neck laser-assisted surgery must be in all cases considered a high-risk aerosol-generating procedure and the highest attention must be paid to surgical safety until evidence-based protocols are available.
The Role of Head and Neck Cancer Advocacy  Organizations During the COVID-19 Pandemic
Head and Neck Editor

Michael G. Moore, MD

May 13, 2020
The COVID-19 pandemic has had a significant impact on many aspects of head and neck cancer care.  The uncertainty and stress resulting from these changes has led many patients and caregivers to turn to head and neck cancer advocacy groups for guidance and support.  Here we outline some of the issues being faced by head and neck cancer patients during the current crisis and provide examples of programs being developed by advocacy groups to address them.  We also highlight the increased utilization of these organizations that has been observed as well as some of the challenges being faced by these not-for-profit groups as they work to serve the head and neck community. 
Impact  of COVID-19 on the mental health of surgeons and coping strategies 
Head and Neck Editor

Anusha Balasubramanian, MRCS, MMED (ORL-HNS)

May 13, 2020
Unprecedented times call for extraordinary measures. While surgeons across the globe try to comprehend the evolving façade of the COVID 19 pandemic and improvise surgical practice to the best of their ability, the psychological impact of the stress on their own mental health and wellbeing has been underestimated. This paper aims to review the indirect and overt factors that may affect the mental health of a surgeon in the present circumstances. Furthermore, it will aim to highlight key coping mechanisms at individual and institutional level, so as to mitigate the negative psychological impact on surgeons.
Mental Health Among Otolaryngology Resident and Attending Physicians During the COVID...
Head and Neck Editor

Karthik Rajasekaran, MD

May 12, 2020
Background: Otolaryngologists are amongst the highest risk for COVID-19 exposure.Methods: A cross-sectional, survey-based, national study evaluating academic otolaryngologists. Burnout, anxiety, distress, and depression were assessed by the single-item Mini-Z burnout assessment, 7-item Generalized Anxiety Disorder scale, 15-item Impact of Event Scale, and 2-item Patient Health Questionnaire, respectively.Results: 349 physicians completed the survey. 165 (47.3%) were residents and 212 (60.7%) were males. Anxiety, distress, burnout and depression were reported in 167 (47.9%), 210 (60.2%), 76 (21.8%) and 37 (10.6%) physicians respectively. Attendings had decreased burnout relative to residents (OR 0.28, CI [0.11-0.68]; p=0.005). Females had increased burnout (OR 1.93, CI [1.12.-3.32]; p=0.018), anxiety (OR 2.53, CI [1.59-4.02]; p<0.005), and distress (OR 2.68, CI [1.64-4.37]; p<0.005). Physicians in states with greater than 20,000 positive cases had increased distress (OR 2.01, CI [1.22-3.31]; p=0.006). Conclusion: During the COVID-19 pandemic, the prevalence of burnout, anxiety, and distress is high among academic otolaryngologists.
Smell and taste disorders during COVID-19 outbreak: a cross-sectional study on 355 pa...
Head and Neck Editor

Valeria Dell’Era, MD

May 12, 2020
Background: As reported by increasing literature, a significant number of patients with SARS-CoV-2 infection developed smell/taste disorders.Aim of this study is to determine prevalence and severity of these symptoms among laboratory confirmed SARS-CoV-2 patients. Secondary objective is to determine their onset/recovery time.Methods: This cross-sectional study was conducted from March 10th to March 30th 2020 at Novara University Hospital during the COVID-19 Italian outbreak. The 355 enrolled patients answered a questionnaire at 14th (or more) days after proven infection.Results: The overall population prevalence of both smell/taste or one of the two disorders was 70%. They were first symptoms in 31 (8,7%) patients.Most patients reported a complete loss that in half of the cases (49.5%) was fully recovered after 14 days, with a median recovery time of 10 days.Conclusion: This study confirms high prevalence of smell/taste disorders in COVID-19 infection with self-recovery for half cases after about two weeks.
NON-STATIONARY IN DISTRIBUTION OF FISH SPECIES RICHNESS IN TROPICAL STREAMS
Thiago Bernardi Vieira
Jorge Iván Botero

Thiago Bernardi Vieira

and 21 more

May 12, 2020
Diversity gradients are observed in various groups of organisms. For fishes in streams, the Water-Energy, Productivity and Temporal Heterogeneity hypotheses are considered the best combination to explain richness patterns. The relationship between species diversity and the variables that represent the hypotheses are generally considered linear and stationary, that is, there is equal relation of cause and effect along an entire geographical extension. The assumption of stationarity has not been tested or even observed in diversity gradients, thus producing imprecise models. Therefore, our goal is to quantify stationarity in the existing relationships between the ichthyofauna of streams and the Water-Energy, Productivity and Temporal Heterogeneity hypotheses using a Geographically Weighted Regression – GWR. In the proposed model, there is conspicuous absence of stationarity between fish species richness and the tested hypotheses. Furthermore, water-energy dynamics were observed as a possible metabolic restriction mechanism acting on the community structuring of stream fishes. This mechanism divides the fish fauna from the studied Brazilian watercourses in two regions: i) Amazonian, characterized by a stable climate and populations with little resistance to thermal variation; and ii) Central, featured by greater ranges of temperature and fish populations resistant to thermal variation.
Pharmacotherapy of kidney transplant rejection: Current therapy and future aspects
Naim Kittana
Alaa  Hamamri

Naim Kittana

and 4 more

May 12, 2020
Renal transplantation is the ultimate therapeutic option for end-stage renal failure. A major challenge that often leads to the loss of the renal graft is the immune-mediated organ rejection, of which there are three types; hyperacute, acute and chronic rejection. This necessitates a proper use of immunosuppressants in the form of short-term induction therapy, as prophylaxis against early acute rejection, and a life-long maintenance therapy against chronic rejection. However, the suppression of the immune system would also compromise the ability of the immune system to eradicate the pathogens and early cancer cells, which increases the risk for various types of serious infections and malignancies. Some of these drugs are also associated with hematologic, metabolic, cardiovascular and renal toxicities. This manuscript thoroughly reviews the available clinical data on the currently approved drugs that are used for both the induction and maintenance therapy, with some focus on their pharmacology. It also discusses the current guidelines and covers, in some details, the new drug classes that are still under clinical investigations.
The Cognitive effects and academic Outcomes following Adenotonsillectomy in children...
Mohmed  Gomaa
Haytham   Mamdouh

Mohmed Gomaa

and 4 more

May 12, 2020
Background: Obstructive sleep apnea (OSA) in children is characterized by repeated airway obstructions during sleep. The peak incidence for pediatric OSA is during early childhood, in particular, the period between 2 and 8 years of age Aims/Objectives: The aim of this study to evaluate the effect of adenotonsillectomy (AT) on the scholastic achievement of children with Obstructive Sleep Apnea (OSA) to put a plan for proper management of those children. Material and Methods: 50 children were selected from 150 children suspected with OSA who came to our unit complaining from symptoms of (OSA) and seeking for adenotonsillectomy. 50 children well diagnosed as OSA due to adenotonsillar hypertrophy confirmed by polysomnography. a full history was taken from parents, audiological evaluation and All 50 children underwent a battery of neurocognitive tests containing process-oriented intelligence scales(Stanford Binet Intelligence scale and Illinois Test of psycholinguistic ability) pre and post adenotonsillectomy to show the effect of Adenotonsillectomy(AT) on scholastic achievement of children with Obstructive Sleep Apnea (OSA). Results: Children with OSAS had lower scores in neurocognitive tests(Illinois test and Stanford Binet intelligent scale) and Percentage (%) of the child’s scores of his subjects (Academic performance) indicating impaired neurocognitive function and school performance, but 8 months after adenotonsillectomy, the children with OSAS demonstrated statistical highly significant differences were obtained between the preoperative and postoperative examination of the study group as regards the symptoms of OSA, IQ and Mental age, auditory perceptual assessment (APA), PLA of VSM (Visual sequential memory), AA (Auditory association) VA (Visual association), AC (Auditory closure), VC (Visual closure), GC (Grammatic closure) and SB (Sound Blending) (p<0.001). Conclusions: the school performance and neurocognitive functions improve after Adenotonsillectomy indicating that the impaired school performance and neurocognitive functions are mostly reversible, at least 8 months following adenotonsillectomy.
An evaluation of additives for mitigating the risk of virus-contaminated feed using a...
Scott Dee
Megan Niederwerder

Scott Dee

and 7 more

May 12, 2020
The role of animal feed as a vehicle for the transport and transmission of viral diseases was first identified during the porcine epidemic diarrhea virus (PEDV) epidemic in North America. Since that time, various feed additives have been evaluated at the laboratory level to measure their effect on viral viability and infectivity in contaminated feed using bioassay piglet models. While a valid first step, the conditions of these studies were not representative of commercial swine production. Therefore, the purpose of this study was to evaluate the ability of feed additives to mitigate the risk of virus-contaminated feed using a model based on real-world conditions. This new model used an “ice-block” challenge, containing equal concentrations of porcine reproductive and respiratory syndrome virus (PRRSV), Seneca-virus A (SVA) and PEDV, larger populations of pigs, representative commercial facilities and environments, along with realistic volumes of complete feed supplemented with selected additives. Following supplementation, the ice block was manually dropped into designated feed bins and pigs consumed feed by natural feeding behavior. After challenge, samples were collected at the pen level (feed troughs, oral fluids) and at the animal level (clinical signs, viral infection, growth rate, and mortality) across five independent experiments involving 15 additives. In 14 of the additives tested, pigs on supplemented diets had significantly greater average daily gain (ADG), significantly lower clinical signs and infection levels, and numerically lower mortality rates compared to non-supplemented controls. In conclusion, the majority of the additives evaluated mitigated the effects of PRRSV 174, PEDV, and SVA in contaminated feed, resulting in improved health and performance.
Novel side by side Foley catheter balloons for extended labour induction: Description...
GJ Hofmeyr
Riche Dalmacio

GJ Hofmeyr

and 1 more

May 12, 2020
Labour induction with a cervical Foley catheter balloon is safer than pharmacological methods, particularly with previous caesarean section, fetal compromise or limited monitoring facilities. Amniotomy is associated with setting-specific risks. To extend balloon retention until labour is established thus avoiding pharmacological agents or amniotomy, we have developed a novel method of variable weighting of the balloon catheter according to the cervical status. When the cervix is too dilated to retain a single balloon, two Foley balloons are inserted side by side at the same level above the cervix.
Probiotics improve atopic dermatitis in children and adolescents: a double blind, pla...
Paula Danielle Santa Maria Albuquerque de Andrade
Jorgete Maria e Silva

Paula Danielle Santa Maria Albuquerque de Andrade

and 6 more

May 12, 2020
Background: The hypothesis that early stimulation of the gut microbiota contributes to immune system balance has encouraged the use of probiotics to treat atopic dermatitis (AD), an immunological disorder characterized by chronic and relapsing skin inflammation, in several clinical studies. This study aimed to evaluate the clinical efficacy of a mixture of probiotics (Lactobacillus and Bifidobacterium) in children and adolescents with AD and the effects of probiotics on sensitization, inflammation, and immunological tolerance. Methods: In this double-blind, randomized, placebo-controlled clinical trial, children and adolescents (aged 2 to 19 years) received one gram (sachet) per day of probiotics or placebo for six months. SCOring of AD (SCORAD) index, serum IgE levels, skin prick test, tolerogenic and inflammatory cytokines were evaluated. Results: Forty patients were evaluated and clinical response was significantly better in the probiotic group as compared to the placebo group after treatment for six months; SCORAD decreased (95% CI, 2.44–52.94) even after adjustment for co-variables (95% CI, 5.52–59.13). Three months after the treatment was discontinued, improvement persisted in the probiotic group even after adjustment for co-variables (95% CI, 0.78– 27.70). IgE levels, skin prick test and cytokines did not differ between groups. Conclusions: AD children and adolescents treated with a mixture of probiotics (Lactobacillus rhamnosus, Lactobacillus acidophilus, Lactobacillus paracasei, and Bifidobacterium lactis) for six months presented a significate SCORAD reduction as compared to placebo group. This probiotics mixture did not affect SPT and IgE levels, as well as inflammatory or tolerogenic cytokines. ClinicalTrials.gov #NCT02519556.
Efficient conversion of glycerol into high value-added chemicals by partial oxidation
Tsutomu Chida
Kousuke Hiromori

Tsutomu Chida

and 5 more

May 12, 2020
Glycerol can be effectively converted to glyceric acid, a high value-added pharmaceutical raw material, through its partial oxidation over an Au catalyst under strongly basic conditions. The factors important for the highly selective production of glyceric acid were investigated experimentally. It was clarified that NaOH was involved in the glycerol activation step to a glycerol alkoxide intermediate in the liquid phase, then glyceric acid was formed by OOH species derived from O2 on an Au catalyst in the partial oxidation step. We have newly discovered the concerted effect of NaOH and O2 in different reaction steps.
Quantitative Evaluation of the Antioxidant Effect of Biomembrane Lipids in the Presen...
Atsushi Takahashi
Ryota Takahashi

Atsushi Takahashi

and 3 more

May 12, 2020
In this report, oxidation of biomembrane lipids, phospholipid (LH) and cholesterol (ChH), were examined experimentally in the presence of vitamin E (VEH) by using a liposome system, which is used widely as a biomembrane model. A kinetic model was constructed by taking into account mechanisms of anti-oxidation and pro-oxidation by VEH to the co-oxidation mechanisms of biomembrane lipids reported previously. The model quantitatively described the oxidation behavior in the liposome system under various VEH addition conditions. The model also predicted the oxidation behavior in vivo under various oral ingestion conditions of VEH. The results suggest that ChH oxidation, which causes various diseases, can be suppressed effectively by taking a certain amount of VEH once a day to avoid a reduction in the VEH concentration present in the biomembrane. The proposed kinetic approach should be a useful tool for characterizing invisible and complicated reaction systems, such as biomembrane oxidation.
Detection of Crimean-Congo hemorrhagic fever and theileriosis in livestock, Madhya Pr...
Manjunathachar Vasanthachar
Chandrashekar Raut

Manjunathachar Vasanthachar

and 7 more

May 12, 2020
Tick borne diseases impinge veterinary and public health, worldwide causing threat to nutritional security, mortality and huge economic losses. Crimean-Congo haemorrhagic fever (CCHF) and theileriosis are the two important tick-borne diseases in humans and animals respectively, risk the public health due to mortality and pose major threat to animal husbandry and livestock industries. Sero-epidemiological and genetic analysis are the key aspects in determining the prevalence of CCHF virus (CCHFV) circulation and molecular prevalence of theileriosis in region wise, which are overlooked in the India, where the country known for largest cattle population, globally. Thus, the present study aims to evaluate the prevalence of CCHFV in animals and genetic diversity of the prevailing Theileria annulata in Jabalpur, Madhya Pradesh. Systematically, livestock population was screened for presence of CCHFV antibodies and T. annulata through commercial IgG ELISA kits and PCR, respectively. Overall, 16% of samples (n=63/393) tested were positive for CCHFV-specific IgG antibodies and 15.9% (n-21/132) animals were positive for T. annulata infections, respectively. It indicates that, CCHFV is circulating in this region in an unnoticed hidden manner. It recommends that, screening of human cases showing hemorrhagic manifestations in health care setup and active surveillance of ticks as a preparedness to combat future outbreaks. Moreover, designing region wise preventive strategic plan may curb these emerging as well as economic tick-borne diseases.
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