AUTHOREA
Log in Sign Up Browse Preprints
LOG IN SIGN UP

Preprints

Explore 66,105 preprints on the Authorea Preprint Repository

A preprint on Authorea can be a complete scientific manuscript submitted to a journal, an essay, a whitepaper, or a blog post. Preprints on Authorea can contain datasets, code, figures, interactive visualizations and computational notebooks.
Read more about preprints.

Minimally invasive congenital cardiac surgery with unsnared inferior vena cava
Alvise Guariento
Claudia Cattapan

Alvise Guariento

and 3 more

May 08, 2020
Here we report two cases of residual atrial septal defect (ASD) with inferior extension towards the inferior vena cava (inferior sinus venosus type). In both cases, patients underwent surgical repair of their ASD in childhood. However, signs of persistent hemodynamic right ventricular overload were detected at the last follow-up and a residual ASD was demonstrated. Both underwent successful minimally invasive surgical closure of the ASD by combining a right postero-lateral mini-thoracotomy (sub-axillary approach) and total peripheral cardiopulmonary bypass, avoiding snaring of the inferior vena cava. This allowed an optimal visualization of the residual intra-cardiac shunt and its subsequent closure.
Peripheral femoral venoarterial extracorporeal membrane oxygenation as bridge to hear...
Erik Orozco-Hernandez
Brett Melnikoff

Erik Orozco-Hernandez

and 4 more

May 08, 2020
Heart-Lung transplant (HLT) is a widely accepted modality for certain patients with advanced and refractory cardiopulmonary disease. Some of these patients are critically ill on the transplant waiting list, and venoarterial extracorporeal membrane oxygenation (VA-ECMO) can be used as a bridge to transplantation. Although the experience with ECMO as a bridge to lung transplant is promising, there is limited evidence to use ECMO as a bridge to HLT. Femoral cannulation remains a concern for ambulation given the risk of bleeding and cannula complications despite studies reporting its safety. We present a case of a 56-year-old male with interstitial lung disease (ILD) and severe secondary pulmonary hypertension, who was successfully bridged to HLT with ambulatory femoral VA-ECMO.
Breaking through permeability-selectivity trade-off of thin-film composite membranes...
Liang Shen
Ming Yi

Liang Shen

and 5 more

May 08, 2020
In this study, we deployed a modified interfacial polymerization process to incorporate multifunctional crown ethers (CEs) into thin-film composite (TFC) polyamide membranes. These CE additives acted as both the phase-transfer catalyst and co-solvent to facilitate the diffusion of amine monomers into the organic phase and also enhanced the free volume content of the selective layer, facilitating water transport and inhibiting the diffusion of draw solutes. Various characterization techniques were employed to elucidate the modification mechanism as a function of CE chemical and physical properties on the microstructure of resultant TFC membranes and consequently separation performances. Compared to TFC membranes produced from traditional interfacial polymerization method, CE-modified membranes exhibited a 146% water flux enhancement and 59% lower reverse salt fluxes with a suitable draw solution. CE-modified membranes also exhibited improved antifouling performance with a lower flux drop (34% decline) and a higher flux recovery ratio (38% improvement).
Experimental and Numerical Investigations of the Shear Behavior of Binary Particle Bl...
Jiecheng Yang
Poom Bunchatheeravate

Jiecheng Yang

and 4 more

May 08, 2020
In this study, a Schulze Ring Shear Tester and the Discrete Element Method (DEM) are employed to investigate the effect of polydispersity on the binary shear flows. Both experimental results and DEM simulations show that the pre-shear stresses are greater for binary blends than for monodispersed particles. The flowability of these mixtures is strongly affected by the solid fraction, with minimal flow function values correlating to maximum packing fraction. However, minimum flow function values are not observed at the same packing fractions where the maximum pre-shear stress occurs. The powder friction has a slightly higher contribution to powder strength than powder adhesion, and the frictional component follows the same trend as shear stress with mixture composition. Using DEM, it is demonstrated that the addition of small adhesive particles reduces the averaged angular velocity of the larger particles, which makes a contribution to the larger shear stress for binary blends.
Simple inheritance, complex regulation: supergene-mediated fire ant queen polymorphis...
Samuel Arsenault
Joanie King

Samuel Arsenault

and 5 more

May 08, 2020
The fire ant Solenopsis invicta exists in two alternate social forms: monogyne nests contain a single reproductive queen and polygyne nests contain multiple reproductive queens. This colony-level social polymorphism corresponds with individual differences in queen physiology, queen dispersal patterns, and worker discrimination behaviors, all evidently regulated by an inversion-based supergene that spans more than 13Mb of a “social chromosome,” contains over 400 protein-coding genes, and rarely undergoes recombination. The specific mechanisms by which this supergene influences expression of the many distinctive features that characterize the alternate forms remain almost wholly unknown. To advance our understanding of these mechanisms, we explore effects of social chromosome genotype and natal colony social form on gene expression in virgin queens sampled as they embarked on nuptial flights, using RNA-sequencing of two important tissues. We observe relatively minor effects of natal social form, that is, of the social/developmental environment, on gene expression profiles, but substantial effects of genotype, including i) supergene-associated gene upregulation, ii) allele-specific expression, and iii) pronounced extra-supergene trans-regulatory effects. These findings, along with observed spatial variation in differential and allele-specific expression within the supergene region, highlight the complex gene regulatory landscape that emerged following evolutionary divergence of the inversion-mediated Sb haplotype from its homolog that largely retained the ancestral gene order. The distinctive social chromosome-linked gene expression trajectories we document at the onset of a queen’s reproductive life expand the known record of relevant molecular correlates of a complex social polymorphism and point to putative genetic underpinnings of the alternate social syndromes.
Insights into the roles of surface oxygen species of manganese oxides for the ozone e...
Lei Zhang
sheng wang

Lei Zhang

and 5 more

May 07, 2020
Manganese oxides with varied Mn valance states but identical morphology were synthesized. Their behaviors of ozone decomposition were investigated following the order of Mn3O4 < Mn2O3 < MnO2 < MnO2-H-200. It was deduced that the superior O3 decomposition capacity for MnO2-H-200 was strongly associated with abundant oxygen vacancies. Among Mn3O4, Mn2O3 and MnO2, the difference on O3 decomposition efficiency was dependent on divergent nature of oxygen vacancy. DFT calculation revealed that Mn3O4 and MnO2 possessed lower formation energy of oxygen vacancy, while MnO2 had the minimum desorption energy of peroxide species (O2*), suggesting that the promotion of the O3 decomposition capability was attributed to the easier O2* desorption. The insights on the deactivation mechanism for MnO2-H-200 further validated the assumptions. As the reaction proceeded, adsorbed oxygen species accumulated on the catalyst surface, and a portion of them were transformed to lattice oxygen.
Applying machine learning algorithms in spatial piping erosion susceptibility in Zara...
Saeid Janizadeh
Kourosh Ahmadi

Saeid Janizadeh

and 5 more

May 07, 2020
Soil erosion is threatening land sustainability. Piping erosion is one of the land degradation processes that lead to significant landscape and environmental changes, and request a proper mapping survey. The purpose of this study is to survey piping erosion susceptibility maps in Zarandeieh watershed of Markazi province using Random Forest (RF), Support Vector Machine (SVM), and Bayesian Generalized Linear Models (Bayesian GLM) machine learning methods. For this purpose, due to the influence of different physiographic, environmental and soil conditions on the development and formation of piping, 18 variables were considered for modeling the piping erosion sensitivity in Zarandieh watershed. Based on field surveys and aerial photographs, 152 points of piping erosion were identified in the studied area, 70% of which was used for modeling, and 30% for model validation. The area under curve (AUC) was used to evaluate the performance of the models used. The results of the pipping erosion susceptibility showed that all three RF, SVM and Bayesian GLM models, have a good performance in the validation stage such as the AUC shown with values of 0.9 for RF, 0.88 for SVM, and 0.87 for Bayesian GLM. Altitude, PH and Bulk density are the variables that had the most impact on the pipping erosion sensitivity in the study area. This result shows that topographical and soil chemical factors are responsible for the piping distribution in the Zarandieh watershed.
Tracheotomy in the SARS-CoV-2 Pandemic
Head and Neck Editor

William R. Carroll, MD

May 07, 2020
Hunter Skoog MD1, Kirk Withrow MD1, Harishanker Jeyarajan MD1, Benjamin Greene MD1, Hitesh Batra MD2, Daniel Cox MD3, Albert Pierce MD4, Jessica W. Grayson MD1, William Carroll MD1
An Overview of COVID-19 Testing and Implications for Otolaryngologists
Head and Neck Editor

Xiao Zhao, MD, PhD

May 07, 2020
Background : Testing for SARS-CoV-2 is important for decision making prior to surgery in otolaryngology. An understanding of current and developing testing methods is important for interpreting test results.Methods : We performed a literature review of current evidence surrounding SARS-CoV-2 diagnostic testing highlighting its utility, limitations, and implications for otolaryngologists.Results : The currently accepted RT-PCR test for SARS-CoV-2 has varying sensitivity according to which subsite of the aerodigestive tract is sampled. Nasal swab sensitivities appear to be about 70%. Chest CT imaging for screening purposes is not currently recommended.Conclusion : Due to the current sensitivity of RT-PCR based testing for SARS-CoV-2, a negative test cannot rule out COVID-19.  Full PPE should be worn during high risk procedures such as aerosol generating procedures even if testing is negative. Patients who test positive during screening should have their surgeries postponed if possible until asymptomatic and have tested negative for SARS-CoV-2.
Separation of C2-C4 Hydrocarbons from Methane by Zeolite MFI Hollow Fiber Membranes F...
Byunghyun Min
Akshay Korde

Byunghyun Min

and 5 more

May 07, 2020
Separation of higher hydrocarbons from methane is an important and energy-intensive operation in natural gas processing. We present a detailed investigation of thin and oriented MFI zeolite membranes fabricated from 2D MFI nanosheets on inexpensive α-alumina hollow fiber supports, particularly for separation of n-butane, propane, and ethane (“natural gas liquids”) from methane. The present MFI membranes display high permeances and selectivities for C2-C4 hydrocarbons over methane, driven primarily by stronger adsorption of C2-C4 hydrocarbons. We study the separation characteristics under unary, binary, ternary and quaternary mixture conditions, including the pressure dependence. The membranes are highly effective in quaternary mixture separation at elevated feed pressures, for example allowing n-butane/methane separation factors of 170–280 and n-butane permeances of 710–2700 GPU in the 1-9 bar feed pressure range. Furthermore, we parametrize and apply multicomponent Maxwell-Stefan transport equations to predict the main trends in separation behavior over a range of operating conditions.
Objective Olfactory Evaluation of Self-reported Loss of Smell in a Case Series of 86...
Head and Neck Editor

Jerome R. Lechien, MD, PhD, MS

May 07, 2020
Objective : To investigate olfactory dysfunction (OD) in patients with mild COVID-19 through patient-reported outcome questionnaires and objective psychophysical testing.Methods : COVID-19 patients with self-reported sudden-onset OD were recruited. Epidemiological and clinical data were collected. Nasal complaints were evaluated with the sino-nasal outcome-22 (SNOT-22). Subjective olfactory and gustatory status was evaluated with the National Health and Nutrition Examination Survey (NHNES). Objective OD was evaluated using psychophysical tests.Results : Eighty-six patients completed the study. The most common symptoms were fatigue (72.9%), headache (60.0%), nasal obstruction (58.6%) and postnasal drip (48.6%). Total loss of smell was self-reported by 61.4% of patients. Objective olfactory testings identified 41 anosmic (47.7%), 12 hyposmic (14.0%), and 33 normosmic (38.3%) patients. There was no correlation between the objective test results and subjective reports of nasal obstruction or postnasal drip.Conclusion : A significant proportion of COVID-19 patients reporting OD do not have OD on objective testing.
Tracheotomy in COVID-19 patients:  Optimizing patient selection and  identifying prog...
Head and Neck Editor

Thomas James Stubington, MD

May 07, 2020
BackgroundTracheotomy, through its ability to wean patients off ventilation, can shorten ICU length of stay and in doing so increase ICU bed capacity, crucial for saving lives during the COVID-19 pandemic. To date, there is a paucity of patient selection criteria and prognosticators to facilitate decision-making and enhance precious ICU capacity.MethodsProspective study of COVID-19 patients undergoing tracheotomy (n=12) over a 4-week period (March-April 2020). Association between pre- and post- operative ventilation requirements and outcomes (ICU stay, time to decannulation, and death) were examined.ResultsPatients who sustained FiO2≤50% and PEEP≤8cm H2O in the 24h pre-tracheotomy exhibited a favourable outcome. Those whose requirements remained below these thresholds post-tracheotomy could be safely stepped down after 48h.ConclusionSustained FiO2≤50% and PEEP≤8cm H2O in the 48h post-tracheotomy are strong predictive factors for a good outcome, raising the potential for these patients to be stepped down early, thus increasing ICU capacity.
A shift to avoid Covid-19 risk and safeguard health governance
Francesco Ferrara
Antonio Vitiello

Francesco Ferrara

and 1 more

May 07, 2020
Immunosuppressive therapies, such as multiple sclerosis, are a risk for people with this condition because they can expose them to a greater risk of Sars-CoV-2 infection. For these reasons, recommendations from agencies, patient associations and scientific societies follow one another quickly so that therapy is guaranteed with good efficacy and without risk, choosing from the many drugs available in multiple formulations.
Comment on Matricardi PM et al.: The first, holistic immunological model of COVID-19:...
Antonio Mirijello
Maria D'Errico

Antonio Mirijello

and 4 more

May 07, 2020
Comment on Matricardi PM et al.: The first, holistic immunological model of COVID-19: implications for prevention, diagnosis, and public health measuresTO THE EDITOR:We read with great interest the review article by Matricardi and colleagues [1] depicting mechanisms of disease for COVID-19 and analyzing both viral and host factors influencing its course. We particularly agree with Authors on the pivotal role of innate immunity in the very early phase of disease, being crucial for the subsequent evolution. Most known weapons of innate immune system are represented by natural antibodies, non-specific antimicrobial proteins, interferons, cytokines and cellular elements (i.e. natural killer cells).[1] However, innate immunity could be influenced by other, still underrecognized, factors.At present, a solid proof of evidence is available on the ability of vitamin D in modulating immune response.[2] Most of data are available from the field of bacterial infections and sepsis,[3] being low vitamin D levels associated with a higher risk of infection and mortality.[4]In addition, vitamin D could play a role against viruses by maintaining physical barriers (i.e. tight junctions, gap junctions, etc.), enhancing natural immunity (i.e. production of cathelicidin, defensins, etc.) and modulating adaptive immune response (i.e. modulation of TH1/TH2 response and inflammation).[5] On this connection, emerging data support the role of vitamin D supplementation in reducing the risk and severity of influenza.[5] Both influenza and COVID-19 show their maximum spread in winter season and the highest severity in elderly people. Reduced vitamin D levels could represent a possible pathophysiological explanation, among others, in both cases.[5,6] With this regard, it has been hypothesized that variations in vitamin D status across countries and latitudes could, at least in part, explain variations of mortality from COVID-19.[6,7]However, at present the exact vitamin D status among COVID-19 patients is unknown.[7] Moreover, the role and mechanisms of vitamin D in the treatment of COVID-19 are still unexplored and several interventional trials are ongoing. Should these hypotheses be confirmed, universal vitamin D supplementation would represent a possible and inexpensive strategy to enhance natural immunity against COVID-19.Antonio Mirijello, MDMaria Maddalena D’Errico, MDAntonella Lamarca, MDPamela Piscitelli, MDSalvatore De Cosmo, MDDepartment of Medical Sciences, IRCCS Casa Sollievo della Sofferenza Hospital, San Giovanni Rotondo, Italy
The diagnostic role of AIM2 in Kawasaki disease
Zhenquan Wang
Qiaoyu Wang

Zhenquan Wang

and 6 more

May 07, 2020
Background:Kawasaki disease, a systemic vasculitis in children, may bring serious complications. However, the etiology of KD remains unclear. AIM2, an intracellular receptor, plays a vital role during the infection caused by a variety of pathogens. However, its role in KD remains unclear. The principal aim of the present research is to concentrate on the relation between AIM2 and KD. Methods: We detected the serum level of AIM2, IL-18 and IL-1β in all subjects by ELISA. The conventional inflammatory indices were detected in all subjects, such as WBC, HB, CRP and so on. Results: The serum concentrations of AIM2, IL-18 and IL-1β were notably increased in the KD group compared to the febrile group and healthy group, respectively. And the three indicators in the KD patients were greatly reduced after interpreted with IVIG. Furthermore, the expressions of IL-18 and IL-1β were positively correlated with AIM2. Meanwhile,the cutoff value of serum AIM2 level for the diagnosis of KD was 541.90 ng/L with the specificity of 60% and sensitivity of 92.5 %,compared to the febrile controls. And the area under curve (AUC) of AIM2 was 0.771. And no difference was observed in the CALs group when compared without the CALs group. Conclusions: The serum AIM2, IL-18 and IL-1β might play a critical role during the progress of KD. AIM2 can be considered as a candidate indicator for Kawasaki disease diagnosis. Keywords: AIM2 · IL-18· IL-1β · Kawasaki disease · Intravenous immunoglobulin ·coronary artery lesions
Successful treatment with cyclosporine and etanercept for deficiency of adenosine dea...
Dai Keino
Kensuke  Kondoh

Dai Keino

and 10 more

May 07, 2020
ETHICS APPROVAL AND CONSENT TO PARTICIPATEThe study design was approved by the appropriate ethics review board. Informed consent was obtained from the patient and parents to participate.CONSENT FOR PUBLICATIONConsent for publication was obtained from the patient and parents.CONFLICT OF INTERESTThe authors have no conflicts of interest relevant to this article to disclose.AUTHOR CONTRIBUTIONSDai Keino : Conceptualization (lead); Writing – original draft (lead); Writing – review and editing (equal). Kensuke Kondoh : Writing – review and editing (equal). Yuhwa Kim : Writing – review and editing (equal). Akina Sudo : Writing – review and editing (equal). Ryo Ohyama : Writing – review and editing (equal). Mizuho Morimoto : Writing – review and editing (equal). Hiroshi Nihira : Investigation (equal). Kazushi Izawa : Investigation (equal). Sachiko Iwaki-Egawa : Investigation (equal). Tetsuya Mori : Writing – original draft (supporting); Writing – review and editing (equal). Akitoshi Kinoshita : Conceptualization (supporting); Writing – review and editing (equal).Keywords: Adenosine deaminase 2 deficiency, cyclosporine, anti-tumor necrosis factor, etanercept, pure red cell aplasiaTo the EditorDeficiency of adenosine deaminase 2 (DADA2) is an autoinflammatory disease caused by loss-of-function homozygous or compound heterozygous mutations in CECR1 (cat eye syndrome chromosome region 1).1,2 The phenotype of the DADA2 is widely heterogeneous with a variable age of onset. Manifestations include fever, early-onset lacunar stroke, livedo, portal hypertension, nodular vasculitis, immunodeficiency, hepatospenomegaly, pure red cell aplasia (PRCA), lymphopenia, cytopenia, and hypogammaglobulinemia. Treatment mainly consists of anti-tumor necrosis factor (TNF) agents. Steroids are also widely used for treatment and have shown variable success but often with flares of inflammation and vasculitis upon tapering. Cyclosporine (CyA), tacrolimus, cyclophosphamide, azathioprine, and methotrexate have all been used with little success.1,2 Although anti-TNF agents prevent strokes and improve the manifestations of vasculitis in DADA2, their efficacy for treating PRCA and bone marrow failure is less clear.3 Hematopoietic stem cell transplantation may be considered for patients with severe hematologic presentations.4Here, we present here a young female patient who was initially diagnosed with idiopathic PRCA and later identified to have had compound a heterozygous mutation in ADA2 associated with DADA2. Administration of CyA and an anti-TNF agent (etanercept) successfully induced and maintained remission.A 13-year-old girl was admitted to our hospital with fatigability and pallor. She has past histories of rash on her extremities at 8 months old and erythema multiforme at 11 years old. Her physical examination revealed palpebral conjunctival pallor and livedo reticularis of the lower limbs. Laboratory examinations indicated anemia (white blood cell count, 2900/μL; neutrophils, 70.0%; lymphocyte, 21.5%; blasts, 0.0%; hemoglobin (Hb), 4.6 g/dL; mean corpuscular volume, 81 fL; HbF, 0.4%; Reticuro, 1.9 × 104/μL; and platelet count, 25.8 × 104/μL). Transaminase and lactate dehydrogenase were within normal ranges. IgA, IgM, and IgG were 42, 46, and 848 mg/dL, respectively. Erythropoietin was 4,650 mIU/mL. Parvovirus, Epstein-Barr virus, and cytomegalovirus were serologically negative.Bone marrow aspirate and biopsy indicated marked erythroid hypoplasia, and her nucleated cell count was 10.8 × 104/μL. Chromosomal banding of bone marrow cells was 46,XX[14/14]. Bone marrow examination indicated no T cell receptor rearrangement. Computed tomography of the chest revealed no thymoma. Mutations affecting genes encoding ribosomal proteins causing Diamond Blackfan anemia were not detected.She was diagnosed with idiopathic pure red cell aplasia (PRCA). Cyclosporine A (CyA) 4.5 mg/kg/day was started at approximately 1.5 months after admission because she was dependent on red blood cell transfusion. Biopsy of the skin of the lower limb revealed necrotizing vasculitis, and a diagnosis of cutaneous polyarteritis nodosa (cPAN) was made (Fig 1). She responded to treatment with CyA and became transfusion-independent. The dose of CyA was gradually reduced, and approximately 10 months after diagnosis, she self-interrupted treatment with CyA. Six months after self-interruption, she became transfusion-dependent again. Resumption of CyA improved her anemia.At the age of 17 years, no ADA2 enzyme activity was detected in the patient’s plasma (0.0 nmole/min/mL, normal range 2.38 ± 0.95 nmole/min/mL). The results of CECR1 sequencing revealed compound heterozygous mutations: c.744delG p.Arg248fs and c.278T>C p.lle93Thr. Thus, the patient was diagnosed with DADA2. Both parents and her sister were not carriers. Magnetic resonance imaging of the head showed no abnormal findings.She continued to administer CyA but cPAN did not improve. She started administration of an anti-TNF agent (etanercept) in combination with CyA and noted improvement in her symptom sof cPAN such as livedo, edema, and fatigue in the lower limbs. More than a year has passed since starting etanercept with no adverse effects. Because Hb has remained at 11–12 g/dL, the amount of CyA has been tapered and is currently 0.5 mg/kg/day.PRCA is a rare hematological disease characterized by bone marrow erythroid aplasia. PRCA may be congenital or acquired; the acquired form of chronic PRCA may present as a primary hematological disease in the absence of any other diseases or secondary to thymoma, lymphoproliferative disorders, infections, and collagen vascular diseases or after exposure to various drugs or chemicals. PRCA associated with DADA2 was described initially in three patients by Hashem et al. and Ben-Ami et al. and further confirmed in additional reports.5,6 A very early age of onset has been reported for PRCA (median, 0.3 years; range, 0.1–12 years).7Initial treatment for PRCA includes the cessation of potentially deleterious drugs and careful observation for one month while making efforts to identify the cause of PRCA. Sawada et al. reported that CyA and corticosteroids induced remission in 74% and 60% of patients, respectively, and that discontinuance of maintenance therapy was strongly correlated with relapse.8 Although PRCA and other types of hematologic dysfunction associated with DADA2 generally do not respond well to immunosuppressive agents such as azathioprine and CyA,9 our patient achieved a response to CyA. CyA may be useful for treating PRCA associated with DADA2.PAN is considered a disease of adulthood with a median age of disease onset of approximately the 4th to 5th decade of life. The annual incidence of childhood vasculitis is estimated to be 20 per 100,000 individuals under 17 years of age.10 Many children with PAN were found to have biallelic mutations inADA2 .1,2,9 The mainstay of treatment for vasculitis/vasculopathy consists of anti-TNF agents (etanercept, infliximab, adalimumab). Although CyA was ineffective for cPAN in our patient, anti-TNF agents (etanercept) was effective, and at the age of 20 years, our patient has no neurological complications such as ischemic strokes, intracranial hemorrhage, and a wide range of neuropathies.REFERENCES1. Zhou Q, Yang D, Ombrello AK, et al. Early-onset stroke and vasculopathy associated with mutations in ADA2. N Engl J Med . 2014;370:911-20.2. Navon Elkan P, Pierce SB, Segel R, et al. Mutant adenosine deaminase 2 in a polyarteritis nodosa vasculopathy. N Engl J Med . 2014;370:921-31.3. Ombrello AK, Qin J, Hoffmann PM, et al. Treatment strategies for deficiency of adenosine deaminase 2. N Engl J Med . 2019;380:1582-4.4. Hashem H, Kumar AR, Muller I, et al. Hematopoietic stem cell transplantation rescues the hematological, immunological, and vascular phenotype in DADA2. Blood . 2017;130:2682-8.5. Ben-Ami T, Revel-Vilk S, Brooks R, et al. Extending the clinical phenotype of adenosine deaminase 2 deficiency. J Pediatr . 2016;177:316-20.6. Hashem H, Egler R, Dalal J. Refractory pure red cell aplasia manifesting as deficiency of adenosine deaminase 2. J Pediatr Hematol Oncol . 2017;39:e293-6.7. Lee PY, Kellner ES, Huang Y, et al. Genotype and functional correlates of disease phenotype in deficiency of adenosine deaminase 2 (DADA2). J Allergy Clin Immunol 2020; doi: 10.1016/j.jaci.2019.12.908.8. Sawada K, Hirokawa M, Fujishima N, et al. PRCA Collaborative Study Group: Long-term relapse-free survival and overall survival of patients with acquired primary idiopathic PRCA receiving cyclosporine A: A nationwide cohort study in Japan for the PRCA Collaborative Study Group.Haematologica . 2007;92:1021-8.9. Hashem H, Kelly SJ, Ganson NJ, et al. Deficiency of Adenosine Desminase 2 (DADA2), an Inherited Cause of Polyarteritis Nodosa and a Mimic of Other Systemic Rheumatologic Disorders. Curr Rheumatol Rep . 2017;19:70.10. Gardner-Medwin JM, Dolezalova P, Cummins C, et al. Incidence of Henoch-Schonlein purpura, Kawasaki disease, and rare vasculitides in children of different ethnic origins. Lancet . 2002;360:1197-202.Figure legendFIGURE 1. Skin of lower limb biopsyLivedo reticularis was observed in both lower limbs to the acrotarsiums.B, C. Necrotizing vasculitis (fibrinoid necrosis) accompanied by neutrophil infiltration was found in the subcutaneous fatty tissue.
Recent Advances in Computational Methods for Biosensor Design
Zahra Khoshbin
Mohammad Reza Housaindokht

Zahra Khoshbin

and 4 more

May 07, 2020
Biosensors are the analytical tools with great application in healthcare, food quality control, and environmental monitoring. They are of considerable interest to be designed by using cost-effective and high efficient approaches. Designing biosensors with improved functionality or application in new target detection has been converted to a fast-growing field of biomedicine and biotechnology branches. Experimental efforts have led to valuable successes in biosensor designing; however, some deficiencies limit their utilization for this purpose. Computational design of biosensors has been introduced as a promising key to eliminate the gap. A set of reliable structure prediction of the biosensor segments, their stability, and accurate descriptors of molecular interactions are required to computationally design of biosensors. In this review, we provide a comprehensive insight into the progress of computational methods to guide the biosensor design, including molecular dynamics (MD) simulation, quantum mechanics (QM) calculations, molecular docking, virtual screening, and a combination of them as the hybrid methodologies. With relying on the recent advances in computational methods, an opportunity has been emerged for them to be complementary or alternative to the experimental methods in the field of biosensor design.
FATIGUE AND SLEEP QUALITY IN PATIENTS WITH EPILEPSY
Mukadder Mollaoglu
Yasemin Zeyrek

Mukadder Mollaoglu

and 1 more

May 07, 2020
Purpose: In epilepsy patients, fatigue and sleep are among the important problems and they negatively affect the patient’s quality of life. The purpose of the present study is to examine epilepsy patients’ fatigue and quality of sleep. Method: The sample of this descriptive cross-sectional study consisted of 166 epilepsy patients undergoing outpatient treatment at a University Hospital Neurology Outpatient Clinic. In the study, Patient Information Form (PIF), Fatigue Severity Scale (FSS) and Pittsburg Sleep Quality Index (PSQI) were used in data collection. Data analysis was performed in SPSS 22.0 package program. Results: It was determined that the mean FSS in epilepsy patients was 4.44±1.72. The mean PSQI was found to be 13.05±4.35. While the relationship of patients’ mean FSS scores with gender, and with the frequency of seizures in the recent year was found significant (p<0.05), the relationship of patients’ mean PSQI scores with gender, marital status, the frequency of seizures, the presence of another disease other than epilepsy, the use of drugs other than antiepileptic drugs, and the number of drugs used, was also determined to be significant (p<0.005). In addition, a positive and statistically significant relationship was observed between FSS and PSQI (p<0.001). Conclusion: As a result, in the present study, patients with epilepsy were found to have a poor quality of sleep and the fatigue at the borderline. The data of the study demonstrates that the treatments and attempts to improve the quality of sleep also alleviate the fatigue of patients. For this reason, it is important to routinely handle sleep and fatigue problems of patients with epilepsy with a multidisciplinary approach and to develop effective approaches for their solution.
Coconut oil as a virucidal agent: prospects and challenges in COVID-19
S V Ramesh

S V Ramesh

May 07, 2020
COVID-19 caused by the novel SARS Coronavirus-2 (SARS-CoV-2) is causing serious blockades in the global public health sphere. In the absence of specific antiviral treatment, exploration of plant-based products with antiviral potential has gained attention. We present the research prospects of utilizing coconut oil directly or its derivatives such as monolaurin in treating COVID-19 with a special emphasis on the biochemical characteristics features. The potential pitfalls therein and way forward are also highlighted. Possibility of developing a medium chain fatty acid-based nasal spray as a prophylactic or therapeutic is also discussed. Nevertheless, the potential impediments in devising suitable therapeutic models are also presented.
Polymorphic fingerprint as an approach to authenticate Iberian pig categories
Laura Bayes-Garcia
Eduard Colomer-Llombart

Laura Bayes-Garcia

and 3 more

May 07, 2020
High-commercial-value products are often susceptible to food fraud. Among them, Iberian dry-cured ham is highly appreciated due to its particular and sensory, but also nutritional, properties. There are four different Iberian ham categories (namely bellota, recebo, cebo de campo and cebo), which depend on the rearing system of the pig during the last stage of the fattening phase. However, there is still a lack of a normalized and robust method capable of authenticating the different product categories and, therefore, preventing mislabeling. In this work, we characterized the polymorphism of eighty raw lipid extracts belonging to the four categories of Iberian pig by using DSC and synchrotron radiation XRD techniques. The results showed that bellota and recebo samples exhibited essentially the same crystallization and polymorphic behavior and this was significantly distinguishable from that of cebo de campo and cebo categories. Crystallization and melting temperatures of bellota and recebo samples were significantly lower than those of cebo de campo and cebo, due to its more unsaturated fatty acids composition. Furthermore, lower amount of polymorphic forms was detected in bellota and recebo. By considering the differences in rearing systems of the pigs, we concluded that the key factor which determined the polymorphic behavior of Iberian pig lipid extracts was not the physical exercise practiced by the pig, but the inclusion of acorns in the feeding system. This work demonstrated that crystallographic techniques, like DSC and XRD, may be promoted to be used as fingerprinting tools for the authentication of high-value food products.
Redefining the Blanking Period After Surgical Ablation For Atrial Fibrillation
Jin Hee Choi
Ki Won Hwang

Jin Hee Choi

and 11 more

May 07, 2020
Background Atrial tachyarrhythmias (ATAs) are common within the three-month blanking period following catheter ablation of atrial fibrillation (AF). However, little evidence is available regarding the current guidelines on the blanking period after surgical AF ablation. We investigate the incidence and significance of early recurrence of atrial tachyarrhythmia (ERAT) and evaluate the optimal blanking period after surgical AF ablation. Methods Data from 259 patients who underwent surgical AF ablation from 2009 to 2016 were collected. ERAT was defined as documented ATA episodes lasting for 30 seconds. A multivariate Cox proportional hazard model was constructed to evaluate the role of ERAT as a predictor of late recurrences (LR) for AF. Results In total, 127 patients (49.0%) experienced their last episodes of ERAT during the first (n=65), second (n=14), or third (n=48) month of the three-month blanking period (p<0.001). One-year freedom from ATAs was 97.8% in patients without ERAT compared with 95.4%, 64.3%, and 8.3% in patients with ERAT in the first, second, and third month after the index procedure, respectively (p<0.001). Hazard ratios of LR according to the timing of the last episode of ERAT first, second, and third month after the procedure were 2.84, 16.70, and 119.75, respectively. Conclusions The ERAT occurred in 49.0% of patients within the first three months after surgical ablation. The occurrence of ERAT within three months after surgical AF ablation was a significant independent predictor of LR. Hence, the currently accepted three-month blanking period needs to be redefined in patients with AF surgical ablation.
Clinical characteristics of patients with re-admitted of novel coronavirus 2019 (nCOV...
Yuping Yuan
Xinchun Ye

Yuping Yuan

and 9 more

May 07, 2020
Background: As the COVID-19 became a world wild infectious emergency, most of patients are cured and discharged. However, some patients are re-admitted due to re-fever, or the PCR test re-positive. To find out whether it is necessary to take them re-admitted, especially the asymptomatic patients, we summarize and analyze the clinical and treatment characteristics of patients with “re-admission” of COVID-19 during twice hospitalizations. Methods: 141 cases with COVID-19 admitted to Wenzhou Central Hospital from January 17, 2020 to March 5, were followed up until March 30. There were 12 patients re-admitted. Data were collected, including clinical records,lab indexes,CT and treatment strategy. The differences were analyzed. Results: Most patients had good results. Totally 12 (8.5%) were re-admitted. 1 (8.3%) had fever,high WBC and progressive CT changes,1 had increased transaminase; the PCR re-tests of these two patients were negative. Another 10 patients were admitted due to PCR test positive, 7 of which were clinical asymptomatic. Compared with 1st discharging, CT imaging of all was significantly improved. All re-admissions did not need oxygen inhalation or mechanical ventilation. Conclusions: The prognosis of patients re-admitted were good, and no serious cases. Staying at home or concentrated medical observation, is a safe and feasible method, if the patient has a positive PCR test and the clinical symptoms are not serious. During medical observation, patients with underlying diseases should be focused on, and most do not need to be re-admitted.
Lung Transplantation as An Intervention for Pediatric Pulmonary Hypertension
Ernestina Melicoff
Don Hayes

Ernestina Melicoff

and 2 more

May 07, 2020
Lung transplantation is recognized as a treatment option for selected patients with end-stage lung disease and pulmonary vascular disorders. Overall, pulmonary hypertension (PH) is the second most frequent indication for children requiring lung transplantation. Pediatric lung transplantation can be complex; in PH patients timing for listing and the perioperative management can be particularly challenging making interdisciplinary collaboration with the referring PH team essential. Because pediatric patients typically have preserved cardiac index and exercise tolerance even with advanced disease, they should be referred early even if they do not meet the proposed criteria for listing by ISHLT published in 2015: NYHA functional class III or IV without improvement, cardiac index < 2 liters/min/m^2, mean right atrial pressure of > 15 mmHg. Bridging strategies with extracorporeal support should be determined at time of listing prior to transplantation anticipating the possibility of clinical deterioration. Bilateral lung transplantation using cardiopulmonary bypass to provide hemodynamics stability is the standard practice in pediatric centers. The immediate post-transplant period is characterized by dramatic normalization of PVR as well as changes in the RV and LV physiology and function which can be life-threatening. Induction, immunosuppression, prophylaxis and surveillance are not different from patients without PH. Overall, outcomes in pediatric lung and heart-lung transplant patients for PH are not different from those children undergoing lung or heart-lung transplant for other indications. In fact, long-term survival is superior in children with idiopathic PH compared to other diseases, there is also a dramatic improvement in quality of life in most recipients
Molecular and phylodynamic analysis of Vietnamese canine parvovirus 2C isolated from...
Tuong  Nguyen Manh
Chutchai Piewbang

Tuong Nguyen Manh

and 3 more

May 07, 2020
Canine parvovirus type 2 (CPV-2) is a small, single-stranded DNA virus causing fatal hemorrhagic enteritis in dogs. Currently, CPV-2 has been classified into CPV-2a, CPV-2b, and CPV-2c based on genetic variation in the VP2 gene. The CPV-2c variant has become ubiquitous worldwide and gained attention for monitoring parvoviral evolution. In this study, we characterized the full-length genome sequences of CPV-2c isolates obtained from 59 dogs in Vietnam. Molecular analysis revealed that Vietnamese CPV-2c shared a common evolutionary pattern with the Asian CPV-2 clade, which is marked by genetic signature patterns in the structural and nonstructural proteins. In addition, these Vietnamese CPV-2c strains exhibited unique Thr112Ile and Ile447Met mutations in the VP1 and VP2 sequence, respectively. Interestingly, phylogenetic analysis indicated that the mutations of amino acid residues in both the structural and nonstructural genes have contributed to the emergence of a new clade, designated here as the Asia-IV clade. The substitution rates, estimated from a dataset containing 199 sequences over the last 40 years, confirmed that CPV-2 showed a high rate of nucleotide substitution, at about 2.49 x 10-4 nucleotide substitutions per site per year (nt/s/y), with VP1/2 and NS1/2 estimates of 3.06 x 10-4 and 3.16 x 10-4 nt/s/y, respectively. Even though no evidence of genetic recombination in these Vietnamese CPV-2c strains was established, potential positive selection sites were observed in both the structural and nonstructural genes, suggesting the viral evolutionary process has occurred in both the structural and nonstructural proteins. Genetic and evolutionary analysis of the full-length genome sequence is necessary to gain evolutionary insight of CPV-2. Further studies are needed to elucidate the potential role of these observed mutations in the novel Asia-IV clade.
← Previous 1 2 … 2607 2608 2609 2610 2611 2612 2613 2614 2615 … 2754 2755 Next →

| Powered by Authorea.com

  • Home