bluuebunny/crossref_metadata_2025_split huggingface dataset:
Bayesian Revisit of the Relationship between the Total Field Strength and the Volume Density of Interstellar Clouds
Authors: Jiang Hangjin , Li Hua-bai , Fan Xiaodan 
Published: February 2020

Abstract
The Zeeman effect has been the only method to directly probe the magnetic field strength in molecular clouds. The Bayesian analysis of Zeeman measurements carried out by Crutcher et al. is the only reference for cloud magnetic field strength. Here we extended their model and Bayesian analysis of the relation between field strength (B) and volume density (n) in the following three directions based on the recent observational and theoretical development. First, we take R, the observational uncertainty of n, as a parameter to be estimated from data. Second, the restriction of α, the index of the B–n relationship, is relieved from [0, 0.75] to [0, 1]. Third, we allow f, the minimum-to-maximum B ratio, to vary with n. Our results show that taking R as a parameter provides a better fitting to the B–n relationship and much more reliable estimates on R, f, and the changing point of α. Arguably our most important finding is that α cannot be reliably estimated by any of the models studied here, either from us or Crutcher et al., if R > 2, which is indeed the case from our estimate. This is the so-called errors-in-variables bias, a well known problem for statisticians.
Modeling the Strongest Silicate Emission Features of Local Type 1 AGNs
Authors: Martínez-Paredes M. , González-Martín O. , Esparza-Arredondo D. , Kim M. , Alonso-Herrero A. , Krongold Y. , Hoang T. , Almeida C. Ramos , Aretxaga I. , Dultzin D. , Hodgson J. 
Published: February 2020

Abstract
We measure the 10 and 18 μm silicate features in a sample of 67 local (z < 0.1) type 1 active galactic nuclei (AGN) with available Spitzer spectra dominated by nonstellar processes. We find that the 10 μm silicate feature peaks at

with a strength (Si
p
= ln f
p
(spectrum)/f
p
(continuum)) of

, while the 18 μm one peaks at

with a strength of

. We select from this sample sources with the strongest 10 μm silicate strength (

, 10 objects). We carry out a detailed modeling of the infrared spectrometer/Spitzer spectra by comparing several models that assume different geometries and dust composition: a smooth torus model, two clumpy torus models, a two-phase medium torus model, and a disk+outflow clumpy model. We find that the silicate features are well modeled by the clumpy model of Nenkova et al., and among all models, those including outflows and complex dust composition are the best. We note that even in AGN-dominated galaxies, it is usually necessary to add stellar contributions to reproduce the emission at the shortest wavelengths.
Arecibo Investigations of Pulsar B0823+26. I. Plasma Source Changes Configure Its Bright and Quiet Modes
Authors: Rankin Joanna M. , Olszanski Timothy E. E. , Wright Geoffrey A. E. 
Published: February 2020

Abstract
The recently discovered 100X weaker quiescent (Q) mode in pulsar B0823+26 is X-ray quiet, unlike its usual bright (B) mode. Arecibo polarimetric observations were conducted to confirm the pulsar's orthogonal geometry and investigate the emission associated with its main pulse (MP), interpulse (IP), and postcursor (PC) components. Main results: (1) the pulsar’s MP, PC, and IP are present in both modes and exhibit a two-pole orthogonal geometry. (2) The B-mode MP is dominated by core emission with weak conal outriders, whereas, the Q-mode double profile shows mainly residual conal emission with little core. The IP is conal in both modes. (3) Sporadic intrapulse emission trailing the PC is detected in the Q mode. (4) B0823+26 falls close to an

boundary of 1032.5 erg s−1 (or B
12/P
2 ∼ 2.5) between core- and conal-dominated profiles—which also represents a boundary between pair-plasma source configurations above the polar cap. For larger energies, the pair-formation front is central, flat, and generates backflow heating, whereas for smaller energies it is peripheral, lower, and produces little heating. (5) Apparently, the pulsar is able to assume both core- and conal-dominated “states” corresponding to its bright and weak modes. These circumstances appear to explain B0823+26's B-mode X-ray bright/core-dominated radio emission or Q-mode X-ray faint/conal radio emission—and why the IP is X-ray quiet in both modes. (6) These same considerations applied to B0943+10 may explain why its brighter radio mode was conal and X-ray quiet, while the weaker one was X-ray bright—because its peripheral sightline would miss most core radiation.
A New Window into the Nature of X-Ray Binaries in M101 from Their Optical Emission
Authors: Chandar Rupali , Johns Paula , Mok Angus , Prestwich Andrea , Gallo Elena , Hunt Qiana 
Published: February 2020

Abstract
The high-energy emission from nearby, star-forming galaxies is dominated by X-ray binaries, where a neutron star or black hole is accreting mass from either a low-mass (≲3 M
⊙) or high-mass (≳8 M
⊙) star. Donor stars with intermediate masses ≈3–7 M
⊙ are also possible, but rarer in our Galaxy. Since it is not possible to separate low-, intermediate-, and high-mass X-ray binaries (LMXBs, IMXBs, and HMXBs) from their X-ray properties alone, we use optical images of M101 taken with the Hubble Space Telescope to directly constrain the masses of donor stars in X-ray binaries down to ≈3 M
⊙. For X-ray binaries that still live within their parent star cluster, the age of the cluster provides strong constraints on the mass of the donor and hence type of binary. We present the classification, on a source-by-source basis, of 140 X-ray point sources in the nearby spiral galaxy M101 (D = 6.4 ± 0.2 Mpc). We find that, overall, HMXBs appear to follow the spiral arms, while LMXBs dominate the bulge region as expected, but also appear to form an inter-arm disk population. The X-ray luminosity functions for HMXBs and LMXBs are well fit by a power-law distribution, dN/dL
X ∝ L

α
, with α = −1.71 ± 0.06 (HMXBs) and α = −1.96 ± 0.08 (LMXBs), and the brightest sources are consistent with the expectations from sampling statistics without requiring a physical cutoff. Overall, our results for HMXB and LMXB populations agree well with the specific star formation rate map presented for M101 recently by Lehmer and collaborators.
The Molecular Gas in the NGC 6240 Merging Galaxy System at the Highest Spatial Resolution
Authors: Treister Ezequiel , Messias Hugo , Privon George C. , Nagar Neil , Medling Anne M. , U Vivian , Bauer Franz E. , Cicone Claudia , Muñoz Loreto Barcos , Evans Aaron S. , Muller-Sanchez Francisco , Comerford Julia M. , Armus Lee , Chang Chin-Shin , Koss Michael , Venturi Giacomo , Schawinski Kevin , Casey Caitlin , Urry C. Megan , Sanders David B. , Scoville Nicholas , Sheth Kartik 
Published: February 2020

Abstract
We present the highest-resolution—15 pc (0.″03)—ALMA 12CO(2–1) line emission and 1.3 mm continuum maps, tracers of the molecular gas and dust, respectively, in the nearby merging galaxy system NGC 6240, which hosts two supermassive black holes growing simultaneously. These observations provide an excellent spatial match to existing Hubble
Space Telescope (HST) optical and near-infrared observations of this system. A significant molecular gas mass, ∼9 × 109
M
⊙, is located between the two nuclei, forming a clumpy stream kinematically dominated by turbulence, rather than a smooth rotating disk, as previously assumed from lower-resolution data. Evidence for rotation is seen in the gas surrounding the southern nucleus but not in the northern one. Dynamical shells can be seen, likely associated with nuclear supernova remnants. We further detect the presence of significant high-velocity outflows, some of them reaching velocities >500 km s−1, affecting a significant fraction, ∼11%, of the molecular gas in the nuclear region. Inside the spheres of influence of the northern and southern supermassive black holes, we find molecular masses of 7.4 × 108 and 3.3 × 109
M
⊙, respectively. We are thus directly imaging the reservoir of gas that can accrete onto each supermassive black hole. These new ALMA maps highlight the critical need for high-resolution observations of molecular gas in order to understand the feeding of supermassive black holes and its connection to galaxy evolution in the context of a major galaxy merger.
CME–CME Interactions as Sources of CME Geoeffectiveness: The Formation of the Complex Ejecta and Intense Geomagnetic Storm in 2017 Early September
Authors: Scolini Camilla , Chané Emmanuel , Temmer Manuela , Kilpua Emilia K. J. , Dissauer Karin , Veronig Astrid M. , Palmerio Erika , Pomoell Jens , Dumbović Mateja , Guo Jingnan , Rodriguez Luciano , Poedts Stefaan 
Published: February 2020

Abstract
Coronal mass ejections (CMEs) are the primary sources of intense disturbances at Earth, where their geoeffectiveness is largely determined by their dynamic pressure and internal magnetic field, which can be significantly altered during interactions with other CMEs in interplanetary space. We analyze three successive CMEs that erupted from the Sun during 2017 September 4–6, investigating the role of CME–CME interactions as a source of the associated intense geomagnetic storm (

nT on September 7). To quantify the impact of interactions on the (geo)effectiveness of individual CMEs, we perform global heliospheric simulations with the European Heliospheric Forecasting Information Asset (EUHFORIA) model, using observation-based initial parameters with the additional purpose of validating the predictive capabilities of the model for complex CME events. The simulations show that around 0.45 au, the shock driven by the September 6 CME started compressing a preceding magnetic ejecta formed by the merging of two CMEs launched on September 4, significantly amplifying its B

z
until a maximum factor of 2.8 around 0.9 au. The following gradual conversion of magnetic energy into kinetic and thermal components reduced the B

z
amplification until its almost complete disappearance around 1.8 au. We conclude that a key factor at the origin of the intense storm triggered by the 2017 September 4–6 CMEs was their arrival at Earth during the phase of maximum B

z
amplification. Our analysis highlights how the amplification of the magnetic field of individual CMEs in spacetime due to interaction processes can be characterized by a growth, a maximum, and a decay phase, suggesting that the time interval between the CME eruptions and their relative speeds are critical factors in determining the resulting impact of complex CMEs at various heliocentric distances (helioeffectiveness).
Nursing Information Technology Knowledge, Skills, and Preparation of Student Nurses, Nursing Faculty, and Clinicians: A U.S. Survey
Authors: McNeil Barbara J , Elfrink Victoria L , Bickford Carol J , Pierce Susan T , Beyea Suzanne C , Averill Carolyn , Klappenbach Cari 
Published: February 2020

ABSTRACT
Because health care delivery increasingly requires timely information for effective decision making, information technology must be integrated into nursing education curricula for all future nurse clinicians and educators. This article reports findings from an online survey of deans and directors of 266 baccalaureate and higher nursing programs in the United States. Approximately half of the programs reported requiring word processing and email skill competency for students entering nursing undergraduate programs. Less than one third of the programs addressed the use of standardized languages or terminologies in nursing and telehealth applications of nursing. One third of the programs cited inclusion of evidence-based practice as part of graduate curricula. Program faculty, who were rated at the "novice" or "advanced beginner" level for teaching information technology content and using information technology tools, are teaching information literacy skills. The southeastern central and Pacific regions of the United States projected the greatest future need for information technology-prepared nurses. Implications for nurse educators and program directors are discussed.
Effect of introduction of single-donor apheresis platelets in dengue management: A comparative analysis of two consecutive dengue epidemics
Authors: Kansay Sonam , Singh Harinder 
Published: February 2020

ABSTRACT
BACKGROUND: The frequency of dengue outbreak is increasing in Southeast Asian countries these days and since there are no specific drugs against the dengue virus; therefore, treatment consists of mainly symptomatic and supportive care.
AIMS: Platelet transfusion forms one of the major parts of treatment therapy in dengue; therefore, this study was initiated to elicit the effect of introduction of single-donor apheresis platelets (SDAPs) in dengue management.
SETTINGS AND DESIGN: This is a retrospective study conducted on 622 clinically suspected cases of dengue infection who received platelet transfusions between August 2013 and December 2015 in a teaching hospital of North India.
MATERIALS AND METHODS: Clinical data, reports of hematological investigation, transfusion request forms, platelet requirements, and data obtained from daily follow-up and blood bank records were analyzed using IBM SPSS version 20.
RESULTS: Average platelet count at which platelet transfusion initiated was 25,703/cumm. Average number of random donor platelets (RDPs) transfused significantly decreased in 2015 (2013 vs. 2015 is 5.4 vs. 4.3) due to the transfusion of SDAP to patients with very low platelet count and those with superimposed high-risk factors. Mean length of stay in hospital was similar for patients receiving RDP only and for those receiving RDP and SDAP both (5.48 vs. 5.54) while that for patients receiving SDAP only was quite lower (3.6). Overall cost of stay was higher for those receiving SDAP transfusions.
CONCLUSION: Decision for initiating platelet transfusions and calculating its dose for dengue patients is highly variable, but transfusing high-dose platelets such as SDAP at an appropriate stage can reduce further requirement of platelet transfusions, fasten the recovery, reduce the hospital stay, lower the risk of transfusion-associated adverse reactions, and can further minimize the associated morbidity and mortality.
Coinfection of chikungunya and dengue viruses: A serological study from North Western region of Punjab, India
Authors: Kaur Maninder , Singh Kanwardeep , Sidhu Shailpreet K , Devi Pushpa , Kaur Manpreet , Soneja Sapna , Singh Nacchartarjit 
Published: February 2020

ABSTRACT
INTRODUCTION: Dengue and chikungunya (CHIK) infections appear to be increasing in all parts of India. Aedes aegypti mosquitoes are common vectors for dengue virus (DENV) and CHIK virus (CHIKV). In areas where both viruses cocirculate, they can be transmitted together. There are very few studies discussing the dengue-chik coinfection from Punjab region of India. The present study was undertaken to study the clinical features of dengue–CHIK coinfection and compare with monoinfection.
MATERIALS AND METHODS: IgM antibody capture (MAC) ELISA for dengue IgM and CHIK IgM and ELISA for nonstructural protein 1 antigen was performed on serum samples obtained from suspected patients.
RESULTS: Out of total 3160 samples from suspected patients for dengue infection, 2178 (68.92%) samples were positive for DENV while CHIK IgM antibodies were positive in 127 patients out of the total suspected 373 cases (34.04%). In addition to this, 283 samples were tested for both viruses, out of which 27 sera were positive (9.54%) for coinfection of dengue and CHIK. The comparison of signs and symptoms showed that the coinfected patients had fever in all cases while rash was seen in only 30% cases. Arthralgia (79%) and thrombocytopenia (77%) was seen in significant number of coinfected cases thus revealing overlapping nature of dengue–CHIK coinfection.
Conclusions: Increase in the number of Dengue and Chikungunya infections and their cocirculation is an important public health concern which warrants the implementation of strict control measures.
One-sample two-smear versus two-sample two-smear approach for the diagnosis of pulmonary tuberculosis
Authors: Chandra T. Jaya 
Published: February 2020

ABSTRACT
BACKGROUND: To evaluate the efficacy of one-sputum sample two-smear approach for the diagnosis of pulmonary tuberculosis (PT).
MATERIALS AND METHODS: Data from January 2012 to December 2015 were analyzed to find (1) number of smear positives (SPs) by spot (S) sample with one and two smears; (2) number of SPs by morning (M) sample with one and two smears; and (iii) number of SPs by two samples with two smears, that is, same-day (SS2) and spot morning (SM) approaches. The Chi-square test was used to evaluate the statistical difference in SP cases.
RESULTS: With one-sample two-smear approach, the smear positivity (SPT) was 87% and 87.5%, for S and M samples, respectively, for Ziehl–Neelsen (ZN) staining; whereas, SPT was 96% and 97%, respectively, for S and M samples, for fluorescent staining (FS) technique. With two-sample two-smear approach, for ZN staining, SPT was 89% each and for FS technique, SPT was 97% and 99%, respectively, for SS2 and SM approaches. The difference was not statistically significant (P > 0.05) between one- and two-sample approaches in the staining techniques.
CONCLUSION: Significant number of SP cases are identified by S sample two-smear approach. Thus, the World Health Organization/Revised National Tuberculosis Control Programme can initiate S sample two-smear approach for the diagnosis of PT.
Phenotypic and genotypic characterization of carbapenem resistance mechanisms in Klebsiella pneumoniae from blood culture specimens: A study from North India
Authors: Gupta Varsha , Garg Ritu , Kumaraswamy Karthikeyan , Datta Priya , Mohi Gursimran Kaur , Chander Jagdish 
Published: February 2020

ABSTRACT
BACKGROUND: Emergence of carbapenem resistance among Enterobacteriaceae in different geographical regions is of great concern as these bacteria are easily transmissible among patients. Carbapenem-resistance in Enterobacteriaceae is due to production of carbapenemases of various classes and hyper production of the ESBLs (Extended spectrum beta lactamases) and Amp C beta lactamases with reduced cell wall permeability mechanisms. Phenotypic detection and differentiation is important for proper infection control and appropriate patient management. This study was done to know the prescence of various beta lactamases and carbapenemases with other mechanisms of resistance in Klebsiella pneumoniae isolates.
MATERIALS AND METHODS: 50 non-duplicate carbapenem resistant isolates of Klebsiella pneumoniae from blood culture specimens were included and various mechanisms of resistance were studied based on phenotypic and genotypic methods.
RESULTS: Out of 50 isolates, 39 (78%) of K.pneumoniae isolates were Extended Spectrum Beta Lactamase (ESBL) producers based on CLSI guidelines. All 50 showed positive Modified Hodge Test (MHT ) and 32 showed Metallo Beta Lactamase (MBL) by Combined Disc Test (CDT). Four isolates showed AmpC production with porin loss . None of the isolates showed Class A KPC production by CDT . In our study all the 10 isolates evaluated by genotypic technique produced CTX-M group 1 enzyme by multiplex PCR. Seven out of 10 strains which showed positive MBL results were positive for NDM .
CONCLUSIONS: Carbapenems are often considered last resort antibiotics in the treatment of infections due to multidrug-resistant organisms. It is therefore mandatory to maintain the clinical efficacy of carbapenems by early detection of various enzymes . For routine clinical laboratories both phenotypic and genotypic tests need to be followed to detect various mechanisms of carbapenem resistance and this is of epidemiological relevance also.
Complement deficiency in pediatric-onset systemic lupus erythematosus
Authors: Afzali Parisa , Isaeian Anna , Sadeghi Peyman , Moazzami Bobak , Parvaneh Nima , Robatjazi Masoumeh , Ziaee Vahid 
Published: February 2020

Abstract
BACKGROUND: Pediatric-onset systemic lupus erythematosus (pSLE) accounts for about 10%-20% of all patients with SLE. Deficiencies in early complement components of the classical pathway are the strong genetic risk factor for the development of SLE. In this study, clinical and laboratory manifestations of both complement-deficient and normal complement pSLE patients were compared.
MATERIALS AND METHODS: To investigate clinical and immunological manifestations of pSLE in Iran, 36 consecutive pSLE patients (onset before 18 years) who were followed up over a period of 2 years, were studied. Complement C1q and C2 levels were measured using radial immunodifusion assay and complement C3 and C4 levels were measured using nephelometry. Medical records were retrospectively evaluated from patient database of Children Medical Center Hospital. Data were assessed through descriptive analysis (confidence interval = 95%), paired t-test, and Pearson correlation test.
RESULTS: Twenty-one patients (58%) had at least one component of complement deficiency. Ten patients (27%) had low C1q level, 11 patients (30.5%) had low C2, nine patients (25%) had low C3, and four patients (11%) had low C4 level. Serum level of complement in pSLE was significantly lower than the control group, except C4 (P = 0.005). The low C1q patients had an earlier age of onset of disease (P < 0.0001). The cutaneous manifestations were more frequent and much more severe in pSLE with low complement (100% vs. 73%). The frequency of renal and musculoskeletal symptoms was equal, but renal morbidity was more common in pSLE with low complement. Positivity for anti-ds-DNA was less common in pSLE with low complement (71% vs. 86%).
CONCLUSION: In pSLE patients with early disease onset and more aggressive SLE manifestations and negative anti-ds-DNA test, complement deficiency should be considered.
Virulence determinant and extended spectrum beta-lactamase production in Klebsiella pneumoniae isolated from a tertiary care hospital, South India
Authors: Kotekani Lathamani , Kotigadde Subbannayya 
Published: February 2020

ABSTRACT
BACKGROUND: Klebsiella pneumoniae on these days show greater resistance towards newer generation cephalosporin. The present study made an effort to show the relevance between ESBL producing K. pneumoniae and virulence determinant in respect to serum resistance and K1, K2 antigens at a tertiary care hospital in South India.
MATERIAL AND METHODS: A total of 520 consecutive, non-duplicate isolates of K. pneumoniae were recovered from various clinical specimens such as Urine (n = 360), sputum (n = 107), pus (n = 25), blood (n = 6) and other miscellaneous specimens (n=22) obtained from both out patients and in patients between June 2012 to July 2016 were included in the study.
RESULTS: Polymerase Chain Reaction to detect bla genes in 62 isolates phenotypically identified as ESBL producers were successful in 58 (93.54%) isolates. Of the 13 ESBL producing hypermucoviscous Klebsiella pneumoniae (hvKP) strains, 6 of them were showing the amplicons for gene's coding for K1 antigens.
CONCLUSION: The study provides further authentication of the global sporadic of bla CTX-M and the relevance between K antigens and serum resistance with ESBL production in our place. As there is no much study available, it also highlights the need for further study of their epidemiological surveillance.