bluuebunny/crossref_metadata_2025_split huggingface dataset:
Optical spectra of FO Aquarii during low and high accretion rates
Authors: Kennedy M R , Garnavich P M , Littlefield C , Marsh T R , Callanan P , Breton R P , Augusteijn T , Wagner R M , Ashley R P , Neric M 
Published: May 2020

ABSTRACT
Between 2016 May and 2018 September, the intermediate polar (IP) FO Aquarii exhibited two distinct low states and one failed low state. We present optical spectroscopy of FO Aquarii throughout this period, making this the first detailed study of an accretion disc during a low state in any IP. Analysis of these data confirm that the low states are the result of a drop in the mass transfer rate between the secondary star and the magnetic white dwarf primary, and are characterized by a decrease in the system’s brightness coupled with a change of the system’s accretion structures from an accretion disc-fed geometry to a combination of disc-fed and ballistic stream-fed accretion, and that effects from accretion on to both magnetic poles become detectable. The failed low state only displays a decrease in brightness, with the accretion geometry remaining primarily disc-fed. We also find that the WD appears to be exclusively accretion disc-fed during the high state. There is evidence for an outflow close to the impact region between the ballistic stream and the disc which is detectable in all of the states. Finally, there is marginal evidence for narrow high-velocity features in the H α emission line during the low states which may arise due to an outflow from the WD. These features may be evidence of a collimated jet, a long predicted yet elusive feature of cataclysmic variables.
DES16C3cje: A low-luminosity, long-lived supernova
Authors: Gutiérrez C P , Sullivan M , Martinez L , Bersten M C , Inserra C , Smith M , Anderson J P , Pan Y-C , Pastorello A , Galbany L , Nugent P , Angus C R , Barbarino C , Carollo D , Chen T-W , Davis T M , Della Valle M , Foley R J , Fraser M , Frohmaier C , González-Gaitán S , Gromadzki M , Kankare E , Kokotanekova R , Kollmeier J , Lewis G F , Magee M R , Maguire K , Möller A , Morrell N , Nicholl M , Pursiainen M , Sollerman J , Sommer N E , Swann E , Tucker B E , Wiseman P , Aguena M , Allam S , Avila S , Bertin E , Brooks D , Buckley-Geer E , Burke D L , Carnero Rosell A , Carrasco Kind M , Carretero J , Costanzi M , da Costa L N , De Vicente J , Desai S , Diehl H T , Doel P , Eifler T F , Flaugher B , Fosalba P , Frieman J , García-Bellido J , Gerdes D W , Gruen D , Gruendl R A , Gschwend J , Gutierrez G , Hinton S R , Hollowood D L , Honscheid K , James D J , Kuehn K , Kuropatkin N , Lahav O , Lima M , Maia M A G , March M , Menanteau F , Miquel R , Morganson E , Palmese A , Paz-Chinchón F , Plazas A A , Sako M , Sanchez E , Scarpine V , Schubnell M , Serrano S , Sevilla-Noarbe I , Soares-Santos M , Suchyta E , Swanson M E C , Tarle G , Thomas D , Varga T N , Walker A R , Wilkinson R ,   (DES Collaboration)
Published: May 2020

ABSTRACT
We present DES16C3cje, a low-luminosity, long-lived type II supernova (SN II) at redshift 0.0618, detected by the Dark Energy Survey (DES). DES16C3cje is a unique SN. The spectra are characterized by extremely narrow photospheric lines corresponding to very low expansion velocities of ≲1500 km s−1, and the light curve shows an initial peak that fades after 50 d before slowly rebrightening over a further 100 d to reach an absolute brightness of Mr ∼ −15.5 mag. The decline rate of the late-time light curve is then slower than that expected from the powering by radioactive decay of 56Co, but is comparable to that expected from accretion power. Comparing the bolometric light curve with hydrodynamical models, we find that DES16C3cje can be explained by either (i) a low explosion energy (0.11 foe) and relatively large 56Ni production of 0.075 M⊙ from an ∼15 M⊙ red supergiant progenitor typical of other SNe II, or (ii) a relatively compact ∼40 M⊙ star, explosion energy of 1 foe, and 0.08 M⊙ of 56Ni. Both scenarios require additional energy input to explain the late-time light curve, which is consistent with fallback accretion at a rate of ∼0.5 × 10−8 M⊙ s−1.
On the opening angle of magnetized jets from neutron-star mergers: the case of GRB170817A
Authors: Nathanail Antonios , Gill Ramandeep , Porth Oliver , Fromm Christian M , Rezzolla Luciano 
Published: May 2020

ABSTRACT
The observations of GW170817/GRB170817A have confirmed that the coalescence of a neutron-star binary is the progenitor of a short gamma-ray burst (GRB). In the standard picture of a short GRB, a collimated highly relativistic outflow is launched after merger and it successfully breaks out from the surrounding ejected matter. Using initial conditions inspired from numerical-relativity binary neutron-star merger simulations, we have performed general-relativistic hydrodynamic (HD) and magnetohydrodynamic (MHD) simulations in which the jet is launched and propagates self-consistently. The complete set of simulations suggests that: (i) MHD jets have an intrinsic energy and velocity polar structure with a ‘hollow core’ subtending an angle θcore ≈ 4°–5° and an opening angle of θjet &gt; ≳ 10°; (ii) MHD jets eject significant amounts of matter and two orders of magnitude more than HD jets; (iii) the energy stratification in MHD jets naturally yields the power-law energy scaling E(&gt; Γβ) ∝ (Γβ)−4.5; (iv) MHD jets provide fits to the afterglow data from GRB170817A that are comparatively better than those of the HD jets and without free parameters; and (v) finally, both of the best-fitting HD/MHD models suggest an observation angle θobs ≃ 21° for GRB170817A.
H i gas content of SDSS galaxies revealed by ALFALFA: implications for the mass–metallicity relation and the environmental dependence of H i in the local Universe
Authors: Zu Ying 
Published: May 2020

ABSTRACT
The neutral hydrogen (H i) gas is an important barometer of recent star formation and metal enrichment activities in galaxies. I develop a novel statistical method for predicting the H i-to-stellar mass ratio, $f_{\mathrm{H\,{\small I}}}$, of galaxies from their stellar mass and optical colour, and apply it to a volume-limited galaxy sample jointly observed by the Sloan Digital Sky Survey and the Arecibo Legacy Fast ALFA survey. I eliminate the impact of the Malmquist bias against H i-deficient systems on the $f_{\mathrm{H\,{\small I}}}$ predictor by properly accounting for the H i detection probability of each galaxy in the analysis. The best-fitting $f_{\mathrm{H\,{\small I}}}$ predictor, with an estimated scatter of 0.272 dex, provides excellent description to the observed H i mass function. After defining an H i excess parameter as the deviation of the observed $f_{\mathrm{H\,{\small I}}}$ from the expected value, I confirm that there exists a strong secondary dependence of the mass–metallicity relation on H i excess. By further examining the 2D metallicity distribution on the specific star formation rate (sSFR) versus H i excess plane, I show that the metallicity dependence on H i is likely more fundamental than that on sSFR. In addition, I find that the environmental dependence of H i in the local Universe can be effectively described by the cross-correlation coefficient between H i excess and the red galaxy overdensity ρcc = − 0.18. This weak anticorrelation also successfully explains the observed dependence of H i clustering on $f_{\mathrm{H\,{\small I}}}$. My method provides a useful framework for learning H i gas evolution from the synergy between future H i and optical galaxy surveys.
Wavelet analysis of the long-term activity of V833 Tau
Authors: Stepanov R , Bondar’ N I , Katsova M M , Sokoloff D , Frick P 
Published: May 2020

ABSTRACT
The bulk of available stellar activity observations is frequently checked for the manifestation of signs in comparison with the known characteristic of solar magnetic modulation. The problem is that stellar activity records are usually an order of magnitude shorter than available observations of solar activity variation. Therefore, the resolved time-scales of stellar activity are insufficient to decide reliably that a cyclic variation for a particular star is similar to the well-known 11-yr sunspot cycles. As a result, recent studies report several stars with double or multiple cycles which serve to challenge the underlying theoretical understanding. This is why a consistent method to separate ‘true’ cycles from stochastic variations is required. In this paper, we suggest that a conservative method, based on the best practice of wavelet analysis previously applied to the study of solar activity, for studying and interpreting the longest available stellar activity record – photometric monitoring of V833 Tau for more than 100 yr. We find that the observed variations of V833 Tau with time-scales of 2–50 yr should be comparable with the known quasi-periodic solar mid-term variations, whereas the true cycle of V833 Tau, if it exists, should be of about a century or even longer. We argue that this conclusion does not contradict the expectations from the stellar dynamo theory.
Platelet-derived growth factor B restores vascular barrier integrity and diminishes permeability in ovarian hyperstimulation syndrome
Authors: Pascuali Natalia , Scotti Leopoldina , Oubiña Gonzalo , de Zúñiga Ignacio , Gomez Peña Mariana , Pomilio Carlos , Saravia Flavia , Tesone Marta , Abramovich Dalhia , Parborell Fernanda 
Published: May 2020

AbstractAlthough advances in the prediction and management of ovarian hyperstimulation syndrome (OHSS) have been introduced, complete prevention is not yet possible. Previously, we and other authors have shown that vascular endothelial growth factor, angiopoietins (ANGPTs) and sphingosine-1-phosphate are involved in OHSS etiology. In addition, we have demonstrated that ovarian protein levels of platelet-derived growth factor (PDGF) ligands -B and -D decrease in an OHSS rat model, whilst PDGFR-β and ANGPT2 remain unchanged. In the present work, we investigated the role of PDGF-B in OHSS by evaluating ligand protein levels in follicular fluid (FF) from women at risk of developing OHSS and by using an immature rat model of OHSS. We demonstrated that PDGF-B and PDGF-D are lower in FF from women at risk of developing OHSS compared to control patients (P &lt; 0.05). In the OHSS rat model, PDGF-B (0.5 µg/ovary) administration decreased ovarian weight (P &lt; 0.05), reduced serum progesterone (P &lt; 0.05) and lowered the percentage of cysts (P &lt; 0.05), compared to untreated OHSS rats, but had no effect on the proportion of follicles or corpora lutea (CL). PDGF-B treatment also restored the expression of steroidogenic acute regulatory protein (P &lt; 0.05) and P450 cholesterol side-chain cleavage enzyme (P &lt; 0.01) to control levels. In addition, PDGF-B increased the peri-endothelial cell area in CL and cystic structures, and reduced vascular permeability compared to untreated OHSS ovaries. Lastly, PDGF-B increased the levels of junction proteins claudin-5 (P &lt; 0.05), occludin (P &lt; 0.05) and β-catenin (P &lt; 0.05), while boosting the extracellular deposition of collagen IV surrounding the ovarian vasculature (PP &lt; 0.01), compared to OHSS alone. In conclusion, our findings indicate that PDGF-B could be another crucial mediator in the onset and development of OHSS, which may lead to the development of novel prediction markers and therapeutic strategies.
Nick-seq for single-nucleotide resolution genomic maps of DNA modifications and damage
Authors: Cao Bo , Wu Xiaolin , Zhou Jieliang , Wu Hang , Liu Lili , Zhang Qinghua , DeMott Michael S , Gu Chen , Wang Lianrong , You Delin , Dedon Peter C 
Published: May 2020

Abstract
DNA damage and epigenetic marks are well established to have profound influences on genome stability and cell phenotype, yet there are few technologies to obtain high-resolution genomic maps of the many types of chemical modifications of DNA. Here we present Nick-seq for quantitative, sensitive, and accurate mapping of DNA modifications at single-nucleotide resolution across genomes. Pre-existing breaks are first blocked and DNA modifications are then converted enzymatically or chemically to strand-breaks for both 3′-extension by nick-translation to produce nuclease-resistant oligonucleotides and 3′-terminal transferase tailing. Following library preparation and next generation sequencing, the complementary datasets are mined with a custom workflow to increase sensitivity, specificity and accuracy of the map. The utility of Nick-seq is demonstrated with genomic maps of site-specific endonuclease strand-breaks in purified DNA from Eschericia coli, phosphorothioate epigenetics in Salmonella enterica Cerro 87, and oxidation-induced abasic sites in DNA from E. coli treated with a sublethal dose of hydrogen peroxide. Nick-seq applicability is demonstrated with strategies for &gt;25 types of DNA modification and damage.
Allograft Nerve Repair Reduces Postoperative Neuropathic Pain Following Nerve Biopsy
Authors: Sakamuri Sarada , Wilson Thomas J 
Published: May 2020

Abstract

BACKGROUND
New or worsened neuropathic pain is common following nerve biopsy and significantly impacts quality of life.

OBJECTIVE
To examine the impact of allograft nerve repair on the likelihood of postoperative worsened neuropathic pain following nerve biopsy.

METHODS
A retrospective cohort study was performed comparing standard nerve biopsy to nerve biopsy with allograft repair. Consecutive patients (N = 51) who underwent whole nerve biopsy between August 1, 2017, and August 1, 2019, by a single surgeon were evaluated for inclusion. The primary outcome was significant worsening of visual analog scale (VAS) score in the nerve distribution 6-mo postbiopsy. Secondary outcomes included significant worsening of VAS in the nerve distribution 3-wk postbiopsy and significant change in Zung Self-Rating Depression Scale 6-mo postbiopsy.

RESULTS
In a multivariate model, allograft nerve repair significantly reduced the likelihood of increased neuropathic pain at 6-mo postbiopsy (odds ratio 0.02, P = .03). Worsened neuropathic pain occurred in 28% of the standard nerve biopsy cohort compared to 4% of the allograft nerve repair cohort. In a multivariate model, an increase in neuropathic pain was strongly associated with an increased likelihood of self-reported depression (odds ratio 57.4, P = .01)

CONCLUSION
Allograft nerve repair significantly reduces the likelihood of postbiopsy worsened neuropathic pain compared to standard techniques. Neuropathic pain significantly impacts quality of life after nerve biopsy, and this is the first technique to demonstrate a significant reduction in neuropathic pain while maintaining the ability to harvest an adequate nerve specimen.
Histological conversion from adenocarcinoma to small cell carcinoma of the lung after treatment with an immune checkpoint inhibitor: a case report
Authors: Miura Naoko , Matsubara Taichi , Takamori Shinkichi , Haratake Naoki , Toyozawa Ryo , Yamaguchi Masafumi , Seto Takashi , Taguchi Kenichi , Takenoyama Mitsuhiro 
Published: May 2020

Abstract
The transformation of adenocarcinoma to small cell lung cancer has been reported as acquisition of resistance to epidermal growth factor receptor (EGFR)-tyrosine kinase inhibitors. We here report a patient who presented histologically confirmed transformation of adenocarcinoma to small cell lung cancer after treatment with immune checkpoint inhibitor. A 65-year-old man was treated with pembrolizumab as first-line therapy and achieved temporarily a stable disease with progression after six cycles of this agent. At that stage, a transbronchial biopsy showed small cell lung cancer, and he was found to have high serum concentrations of neuron-specific enolase despite concentrations of numerous tumor markers, including neuron-specific enolase, having been within normal limits at the time of presentation. The patient thereafter was treated as a small cell carcinoma patient using cisplatin plus irinotecan and amrubicin.
Hypoglossal-Facial Side-to-End Neurorrhaphy With Concomitant Masseteric-Zygomatic Nerve Branch Coaptation and Muscle Transfer for Facial Reanimation: Technique and Case Report
Authors: Yoshioka Nobutaka 
Published: May 2020

Abstract

BACKGROUND
Hypoglossal-facial direct side-to-end neurorrhaphy has become widely used for facial reanimation in patients with irreversible facial nerve damage. Although this procedure achieves good restoration of facial function, it has disadvantages such as mass movement and lack of spontaneity.

OBJECTIVE
To present a new facial reanimation technique using hypoglossal-facial direct side-to-end neurorrhaphy with concomitant masseteric-zygomatic nerve branch coaptation and secondary muscle transfer to reduce mass movement and achieve a spontaneous smile in patients with facial paralysis.

METHODS
This article describes a novel facial reanimation technique that employs hypoglossal and masseteric nerve transfer combined with secondary vascularized functional gracilis muscle transfer.

RESULTS
Details of the technique are reported in a patient with complete facial paralysis after brain surgery. The hypoglossal nerve was partially served and connected to the mastoid segment of the facial nerve by side-to-end anastomosis to restore facial symmetry. A nerve supplying the masseter muscle was coapted with a zygomatic branch by end-to-end anastomosis to restore voluntary movement of the oral commissure, as well as to assist with eye closure. A cross face sural nerve graft was connected to zygomatic branches on the healthy side. In the second stage, a vascularized functional gracilis muscle graft was transplanted using the cross face nerve graft as the donor nerve to restore a natural smile.

CONCLUSION
Hypoglossal-facial neurorrhaphy with concomitant masseteric-zygomatic nerve branch coaptation and muscle transfer is an alternative facial reanimation technique that reduces mass movement and achieves a natural smile.
Lumbar Lateral Recess Decompression: 2-Dimensional Operative Video
Authors: Khalsa Siri Sahib S , Saadeh Yamaan S , Yee Timothy J , Strong Michael J , Smith Brandon W , Oppenlander Mark E 
Published: May 2020

Abstract
Lateral recess stenosis is a common cause of lumbar radiculopathy in adults. A lumbar nerve root travels in the lateral recess prior to exiting the spinal canal via the neural foramen. In the lateral recess, the traversing nerve root is susceptible to compression by the degenerative hypertrophy of the medial facet in addition to hypertrophied ligamentum flavum and herniated intervertebral disc.
1
These degenerative changes are also typically associated with neural foraminal stenosis. Surgical treatment in unilateral cases consists of hemilaminectomy, medial facetectomy, foraminotomy, and, if applicable, microdiscectomy. In this video, we present a case of a 64-yr-old male presenting with progressive left L5 radiculopathy refractory to conservative management, with magnetic resonance imaging (MRI) findings of left L4-5 foraminal and lateral recess stenosis. We demonstrate the operative steps to complete a left L4-5 hemilaminectomy, medial facetectomy, foraminotomy, and microdiscectomy. Appropriate patient consent was obtained.
Microsurgical Resection of a C1-C2 Dumbbell and Ventral Cervical Schwannoma: 2-Dimensional Operative Video
Authors: Nguyen Vincent N , Khan Nickalus R , Arnautović Kenan I 
Published: May 2020

Abstract
Dumbbell schwannoma of the cervical spine is a known entity,
1-5
and should be radically resected with the preservation or improvement of neurological function. However, to our knowledge, an operative video of a C1-C2 cervical dumbbell schwannoma with ventral extension and dorsal spinal cord compression has not been reported previously. This tumor resection video performed by the senior author (KIA) includes details of dural opening, and techniques for microsurgical resection and for postoperative closure to avoid cerebrospinal fluid (CSF) leak and pseudomeningocele formation.
Fat grafting was performed through a small paraumbilical incision. The patient was prone in MAYFIELD 3-point pin fixation (Integra LifeSciences, Plainsboro Township, New Jersey). Intraoperative neurophysiological electrodes were placed for somatosensory evoked potential (SSEP) and motor evoked potential (MEP) monitoring. Stealth neuronavigation was used to aid in tumor localization. A small suboccipital craniectomy and C1 laminectomy were performed before opening the dura. Using a microsurgical technique, the dura was opened in the form of the letter “Y.” The right-sided dentate ligament was cut to aid in the mobilization of the tumor away from the spinal cord. After dividing the tumor at the dumbbell isthmus, the ventral tumor component was removed, with attention paid to the division of a perforator coming from the vertebral artery. Intraforaminal tumor debulking was performed with a cavitron ultrasonic surgical aspirator (CUSA) and resected.
High cervical dumbbell schwannoma should be radically resected while preserving and improving preoperative neurological function. Avoidance of CSF leak and formation of pseudomeningocele should be planned at the beginning, utilizing fascia and fat graft to avoid this feared complication.
The patient provided written consent and permission to publish her image.
Supraclavicular Resection of a Cervical Rib Causing Thoracic Outlet Syndrome: 2-Dimensional Operative Video
Authors: Burks Stephen Shelby , Wolfe Erin M , Yoon Jang Won , Levi Allan D 
Published: May 2020

Abstract
Presence of a cervical rib results from overdevelopment of the seventh cervical vertebrae.
1-3
The cervical rib along with scalene muscles can cause neurogenic thoracic outlet syndrome.
4,5
Rib resection is typically done via anterior approach, using either supraclavicular or transaxillary route.
6,7
We present an operative video detailing supraclavicular resection of a cervical rib causing neurogenic thoracic outlet syndrome with direct decompression of the lower trunk of the brachial plexus. The patient presented with severe symptoms including hand atrophy. We were able to directly visualize the rib and resect it, along with scalene musculature. We present 3-mo follow-up data noting clinical improvement in neuropathic symptoms.