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1.
AJNR Am J Neuroradiol ; 44(1): 105-110, 2023 01.
Article in English | MEDLINE | ID: mdl-36521966

ABSTRACT

Sarcoidosis is a multisystem granulomatous disease, with intramedullary spinal cord involvement seen in <1% of cases. This case series illustrates the clinical presentations and imaging findings of 5 patients with intramedullary spinal neurosarcoidosis occurring at sites of spondylotic spinal canal stenosis, which can be indistinguishable from spondylotic myelopathy with cord enhancement. Both entities are most common in middle-aged men and present with weeks to months of motor and sensory symptoms. On imaging, both can have focal spinal cord enhancement and longitudinally extensive signal abnormality centered at or just below the level of spinal canal stenosis. On the basis of our experience, we suggest that in patients with cord enhancement centered at or just below a site of spinal canal stenosis, consideration should be given to chest imaging and lymph node biopsy when applicable, to assess for the possibility of underlying sarcoidosis before surgical decompression.


Subject(s)
Sarcoidosis , Spinal Cord Compression , Spinal Cord Diseases , Spinal Stenosis , Spondylosis , Male , Middle Aged , Humans , Constriction, Pathologic/pathology , Cervical Vertebrae/surgery , Spinal Cord Diseases/diagnostic imaging , Spinal Cord Diseases/pathology , Spinal Cord/diagnostic imaging , Spinal Cord/pathology , Spinal Stenosis/diagnostic imaging , Spinal Stenosis/pathology , Spondylosis/diagnostic imaging , Sarcoidosis/diagnostic imaging , Sarcoidosis/pathology , Magnetic Resonance Imaging
2.
AJNR Am J Neuroradiol ; 42(8): E48-E52, 2021 08.
Article in English | MEDLINE | ID: mdl-33926899

ABSTRACT

The Accreditation Council for Graduate Medical Education is currently in the process of specialty-by-specialty revision of the Milestones. As a result, the Neuroradiology Milestones 2.0 Workgroup was created to refine a system of competency-based assessments for fellow educational growth and development. Strengths of the new Milestones include decreased complexity and uniformity within a subcompetency as it relates to a specific educational development trajectory. The Supplemental Guide serves to decrease clutter in the Milestones 2.0 document and provides a more practical resource for guidance. This article serves to review the history of the Neuroradiology Milestones, followed by a summary of the timeline of events and discussions of the workgroup for development of Neuroradiology Milestones 2.0 and a synopsis of major changes. The plan is for the updated Neuroradiology Milestones to take effect in 2021 or 2022 based on public commentary.


Subject(s)
Clinical Competence , Education, Medical, Graduate , Accreditation , Humans
3.
Nanoscale ; 10(17): 8253-8268, 2018 May 03.
Article in English | MEDLINE | ID: mdl-29687111

ABSTRACT

We report a computational discovery of novel grain boundary structures and multiple grain boundary phases in elemental body-centered cubic (bcc) metals represented by tungsten, tantalum and molybdenum. While grain boundary structures created by the γ-surface method as a union of two perfect half crystals have been studied extensively, it is known that the method has limitations and does not always predict the correct ground states. Herein, we use a newly developed computational tool, based on evolutionary algorithms, to perform a grand-canonical search of high-angle symmetric tilt and twist boundaries, and we find new ground states and multiple phases that cannot be described using the conventional structural unit model. We use molecular dynamics (MD) simulations to demonstrate that the new structures can coexist at finite temperature in a closed system, confirming that these are examples of different grain boundary phases. The new ground state is confirmed by first-principles calculations.

4.
J Phys Condens Matter ; 29(45): 455301, 2017 Nov 15.
Article in English | MEDLINE | ID: mdl-28872056

ABSTRACT

Complex states of nanoscale interstitial dislocation loop can be described by its habit plane and Burgers vector. Using atomistic simulations, we provide direct evidences on the change of the habit plane of a 1/2〈1 1 1〉 loop from {1 1 1} to {1 1 0} and {2 1 1}, in agreement with TEM observations. A new {1 0 0} habit plane of this loop is also predicted by simulations. The non-conservation of the Burgers vector is approved theoretically for: (1) dislocation reactions between loops with different Burgers vectors and (2) the transition between 〈1 0 0〉 loops and 1/2〈1 1 1〉 loops. The rotation from a 1/2〈1 1 1〉 to a 〈1 0 0〉 loop has also been explored, which occurs at 570 K for time on the order of 10 s. The dislocation-precipitate phase duality and change of habit plane are then proposed as new features for nano-scale dislocation loops.

5.
Chem Phys Lett ; 670: 5-10, 2017 Feb 16.
Article in English | MEDLINE | ID: mdl-28824195

ABSTRACT

Environmentally persistent free radicals (EPFRs) have significant environmental and public health impacts. In this study, we demonstrate that EPFRs formed on ZnO nanoparticles provide two significant surprises. First, EPR spectroscopy shows that phenoxy radicals form readily on ZnO nanoparticles at room temperature, yielding EPR signals similar to those previously measured after 250°C exposures. Vibrational spectroscopy supports the conclusion that phenoxy-derived species chemisorb to ZnO nanoparticles under both exposure temperatures. Second, DFT calculations indicate that electrons are transferred from ZnO to the adsorbed organic (oxidizing the Zn), the opposite direction proposed by previous descriptions of EPFR formation on metal oxides.

6.
J Phys Condens Matter ; 29(14): 145201, 2017 Apr 12.
Article in English | MEDLINE | ID: mdl-28059774

ABSTRACT

A self-adaptive accelerated molecular dynamics method is developed to model infrequent atomic-scale events, especially those events that occur on a rugged free-energy surface. Key in the new development is the use of the total displacement of the system at a given temperature to construct a boost-potential, which is slowly increased to accelerate the dynamics. The temperature is slowly increased to accelerate the dynamics. By allowing the system to evolve from one steady-state configuration to another by overcoming the transition state, this self-evolving approach makes it possible to explore the coupled motion of species that migrate on vastly different time scales. The migrations of single vacancy (V) and small He-V clusters, and the growth of nano-sized He-V clusters in Fe for times in the order of seconds are studied by this new method. An interstitial-assisted mechanism is first explored for the migration of a helium-rich He-V cluster, while a new two-component Ostwald ripening mechanism is suggested for He-V cluster growth.

7.
Ann Oncol ; 25(10): 2065-2072, 2014 Oct.
Article in English | MEDLINE | ID: mdl-25057164

ABSTRACT

BACKGROUND: Type 2 diabetes mellitus has been associated with an excess risk of pancreatic cancer, but the magnitude of the risk and the time-risk relationship are unclear, and there is limited information on the role of antidiabetic medications. PATIENTS AND METHODS: We analyzed individual-level data from 15 case-control studies within the Pancreatic Cancer Case-Control Consortium, including 8305 cases and 13 987 controls. Pooled odds ratios (ORs) were estimated from multiple logistic regression models, adjusted for relevant covariates. RESULTS: Overall, 1155 (15%) cases and 1087 (8%) controls reported a diagnosis of diabetes 2 or more years before cancer diagnosis (or interview, for controls), corresponding to an OR of 1.90 (95% confidence interval, CI, 1.72-2.09). Consistent risk estimates were observed across strata of selected covariates, including body mass index and tobacco smoking. Pancreatic cancer risk decreased with duration of diabetes, but a significant excess risk was still evident 20 or more years after diabetes diagnosis (OR 1.30, 95% CI 1.03-1.63). Among diabetics, long duration of oral antidiabetic use was associated with a decreased pancreatic cancer risk (OR 0.31, 95% CI 0.14-0.69, for ≥15 years). Conversely, insulin use was associated with a pancreatic cancer risk in the short term (OR 5.60, 95% CI 3.75-8.35, for <5 years), but not for longer duration of use (OR 0.95, 95% CI 0.53-1.70, for ≥15 years). CONCLUSION: This study provides the most definitive quantification to date of an excess risk of pancreatic cancer among diabetics. It also shows that a 30% excess risk persists for more than two decades after diabetes diagnosis, thus supporting a causal role of diabetes in pancreatic cancer. Oral antidiabetics may decrease the risk of pancreatic cancer, whereas insulin showed an inconsistent duration-risk relationship.


Subject(s)
Diabetes Mellitus, Type 2/complications , Hypoglycemic Agents/therapeutic use , Pancreatic Neoplasms/epidemiology , Adult , Aged , Aged, 80 and over , Case-Control Studies , Diabetes Mellitus, Type 2/drug therapy , Diabetes Mellitus, Type 2/epidemiology , Diabetes Mellitus, Type 2/pathology , Female , Humans , Insulin , Logistic Models , Male , Middle Aged , Pancreatic Neoplasms/drug therapy , Pancreatic Neoplasms/etiology , Pancreatic Neoplasms/pathology , Risk Factors , Smoking
8.
Article in English | MEDLINE | ID: mdl-27134636

ABSTRACT

A 5 meter toroidal grating (5m-TGM) beamline has been commissioned to deliver 28 mrad of bending magnet radiation to an ultrahigh vacuum endstation chamber to facilitate angle resolved photoelectron spectroscopy. The 5m-TGM beamline is equipped with Au-coated gratings with 300, 600 and 1200 lines/mm providing monochromatized synchrotron radiation in the energy ranges 25-70 eV, 50-120 eV and 100-240 eV, respectively. The beamline delivers excellent flux (~1014-1017 photons/sec/100mA) and a combined energy resolution of 189 meV for the beamline (at 1.0 mm slit opening) and HA-50 hemispherical analyzer was obtained at the Fermi level of polycrystalline gold crystal. Our preliminary photoelectron spectroscopy results of phenol adsorption on TiO2 (110) surface reveals the metal ion (Ti) oxidation.

9.
Ann Oncol ; 24(11): 2903-10, 2013 Nov.
Article in English | MEDLINE | ID: mdl-23970016

ABSTRACT

BACKGROUND: Peptic ulcer and its treatments have been associated to pancreatic cancer risk, although the evidence is inconsistent. METHODS: We pooled 10 case-control studies within the Pancreatic Cancer Case-control Consortium (PanC4), including 4717 pancreatic cancer cases and 9374 controls, and estimated summary odds ratios (OR) using multivariable logistic regression models. RESULTS: The OR for pancreatic cancer was 1.10 [95% confidence interval (CI) 0.98-1.23] for history of ulcer (OR = 1.08 for gastric and 0.97 for duodenal ulcer). The association was stronger for a diagnosis within 2 years before cancer diagnosis (OR = 2.43 for peptic, 1.75 for gastric, and 1.98 for duodenal ulcer). The OR was 1.53 (95% CI 1.15-2.03) for history of gastrectomy; however, the excess risk was limited to a gastrectomy within 2 years before cancer diagnosis (OR = 6.18, 95% CI 1.82-20.96), while no significant increased risk was observed for longer time since gastrectomy. No associations were observed for pharmacological treatments for ulcer, such as antacids, H2-receptor antagonists, or proton-pump inhibitors. CONCLUSIONS: This uniquely large collaborative study does not support the hypothesis that peptic ulcer and its treatment materially affect pancreatic cancer risk. The increased risk for short-term history of ulcer and gastrectomy suggests that any such association is due to increased cancer surveillance.


Subject(s)
Gastrointestinal Diseases/pathology , Pancreatic Neoplasms/pathology , Ulcer/pathology , Aged , Case-Control Studies , Female , Gastrectomy/adverse effects , Gastrointestinal Diseases/complications , Gastrointestinal Diseases/epidemiology , Gastrointestinal Diseases/surgery , Humans , Logistic Models , Middle Aged , Pancreatic Neoplasms/complications , Pancreatic Neoplasms/epidemiology , Risk Factors , Ulcer/complications , Ulcer/epidemiology , Ulcer/surgery
10.
Ann Oncol ; 23(11): 2964-2970, 2012 Nov.
Article in English | MEDLINE | ID: mdl-22767586

ABSTRACT

BACKGROUND: Pancreatitis is a known risk factor for pancreatic cancer; however, an unknown fraction of the disease is thought to be a consequence of tumor-related duct obstruction. PATIENTS AND METHODS: A pooled analysis of a history of pancreatitis and risk of pancreatic cancer was carried out considering the time interval between diagnoses and potential modification by covariates. Adjusted pooled odds ratios (ORs) and 95% confidence intervals (CIs) were estimated from 10 case-control studies (5048 cases of ductal pancreatic adenocarcinoma and 10,947 controls) taking part in the International Pancreatic Cancer Case-Control Consortium (PanC4). RESULTS: The association between pancreatitis and pancreatic cancer was nearly three-fold at intervals of >2 years between diagnoses (OR: 2.71, 95% CI: 1.96-3.74) and much stronger at intervals of ≤2 years (OR: 13.56, 95% CI: 8.72-21.90) probably reflecting a combination of reverse causation and antecedent misdiagnosis of pancreas cancer as pancreatitis. The younger (<65 years) pancreatic cancer cases showed stronger associations with previous (>2 years) pancreatitis (OR: 3.91, 95% CI: 2.53-6.04) than the older (≥65 years) cases (OR: 1.68, 95% CI: 1.02-2.76; P value for interaction: 0.006). CONCLUSIONS: Despite a moderately strong association between pancreatitis (diagnosed before >2 years) and pancreatic cancer, the population attributable fraction was estimated at 1.34% (95% CI: 0.612-2.07%), suggesting that a relatively small proportion of pancreatic cancer might be avoided if pancreatitis could be prevented.


Subject(s)
Pancreatic Neoplasms/epidemiology , Pancreatic Neoplasms/etiology , Pancreatitis/complications , Adenocarcinoma/epidemiology , Adenocarcinoma/etiology , Aged , Alcohol Drinking/adverse effects , Case-Control Studies , Diabetes Complications , Female , Humans , Male , Middle Aged , Odds Ratio , Pancreatitis/etiology , Risk Factors , Smoking/adverse effects
11.
J Phys Condens Matter ; 24(9): 095001, 2012 Mar 07.
Article in English | MEDLINE | ID: mdl-22274988

ABSTRACT

To develop a model system containing regularly spaced misfit dislocations for studies of the radiation resistance of nanoscale defects, epitaxial thin films of Cr, Mo, and Cr(x)Mo(1-x) alloys were deposited on MgO(001) by molecular beam epitaxy. Film compositions were chosen to vary the lattice mismatch with MgO. The film structure was investigated by x-ray diffraction (XRD), Rutherford backscattering spectrometry (RBS) and scanning transmission electron microscopy (STEM). Epitaxial films with reasonably high crystalline quality and abrupt interfaces were achieved at a relatively low deposition temperature, as confirmed by STEM. However, it was found by XRD and RBS in the channeling geometry that increasing the Mo content of the CrMo alloy films degraded the crystalline quality, despite the improved lattice match with MgO. XRD rocking curve data indicated that regions of different crystalline order may be present within the films with higher Mo content. This is tentatively ascribed to spinodal decomposition into Cr-rich and Mo-rich regions, as predicted by the Cr(x)Mo(1-x) phase diagram.


Subject(s)
Alloys/chemistry , Chromium/chemistry , Molybdenum/chemistry , Materials Testing , Microscopy, Electron, Scanning , Surface Properties , X-Ray Diffraction
12.
Ann Oncol ; 23(7): 1880-8, 2012 Jul.
Article in English | MEDLINE | ID: mdl-22104574

ABSTRACT

BACKGROUND: To evaluate the dose-response relationship between cigarette smoking and pancreatic cancer and to examine the effects of temporal variables. METHODS: We analyzed data from 12 case-control studies within the International Pancreatic Cancer Case-Control Consortium (PanC4), including 6507 pancreatic cases and 12 890 controls. We estimated summary odds ratios (ORs) by pooling study-specific ORs using random-effects models. RESULTS: Compared with never smokers, the OR was 1.2 (95% confidence interval [CI] 1.0-1.3) for former smokers and 2.2 (95% CI 1.7-2.8) for current cigarette smokers, with a significant increasing trend in risk with increasing number of cigarettes among current smokers (OR=3.4 for ≥35 cigarettes per day, P for trend<0.0001). Risk increased in relation to duration of cigarette smoking up to 40 years of smoking (OR=2.4). No trend in risk was observed for age at starting cigarette smoking, whereas risk decreased with increasing time since cigarette cessation, the OR being 0.98 after 20 years. CONCLUSIONS: This uniquely large pooled analysis confirms that current cigarette smoking is associated with a twofold increased risk of pancreatic cancer and that the risk increases with the number of cigarettes smoked and duration of smoking. Risk of pancreatic cancer reaches the level of never smokers ∼20 years after quitting.


Subject(s)
Pancreatic Neoplasms/etiology , Smoking/adverse effects , Case-Control Studies , Humans , Logistic Models , Multivariate Analysis , Odds Ratio , Sensitivity and Specificity
13.
J Phys Condens Matter ; 23(3): 035701, 2011 Jan 26.
Article in English | MEDLINE | ID: mdl-21406868

ABSTRACT

Ab initio calculations based on density functional theory have been performed to determine the relative stabilities and migration of H and He atoms in hcp-Sc. The results show that the formation energy of an interstitial H or He atom is smaller than that of a corresponding substitutional atom. The tetrahedral (T) interstitial position is more stable than an octahedral (O) position for both He and H interstitials. The nudged elastic band method has been used to study the migration of interstitial H and He atoms in hcp-Sc. It is found that the migration energy barriers for H interstitials in hcp-Sc are significantly different from those for He interstitials, but their migration mechanisms are similar. In addition, the formation energies of five different configurations of a H-H pair were determined, revealing that the most stable configuration consists of two H atoms located at the second-neighbor tetrahedral interstitial sites along the hexagonal direction. The formation and relative stabilities of some small He clusters have also been investigated.

15.
Ann Oncol ; 22(6): 1420-1426, 2011 Jun.
Article in English | MEDLINE | ID: mdl-21245160

ABSTRACT

BACKGROUND: Cigarette smoking is the best-characterized risk factor for pancreatic cancer. However, data are limited for other tobacco smoking products and smokeless tobacco. MATERIALS AND METHODS: We conducted a pooled analysis of cigar and pipe smoking and smokeless tobacco use and risk of pancreatic cancer using data from 11 case-control studies (6056 cases and 11,338 controls) within the International Pancreatic Cancer Case-Control Consortium (PanC4). Pooled odds ratios (OR) and the corresponding 95% confidence intervals (CI) were estimated by unconditional multiple logistic regression models adjusted for study center and selected covariates. RESULTS: Compared with never tobacco users, the OR for cigar-only smokers was 1.6 (95% CI: 1.2-2.3), i.e. comparable to that of cigarette-only smokers (OR 1.5; 95% CI 1.4-1.6). The OR was 1.1 (95% CI 0.69-1.6) for pipe-only smokers. There was some evidence of increasing risk with increasing amount of cigar smoked per day (OR 1.82 for ≥ 10 grams of tobacco), although not with duration. The OR for ever smokeless tobacco users as compared with never tobacco users was 0.98 (95% CI 0.75-1.3). CONCLUSION: This collaborative analysis provides evidence that cigar smoking is associated with an excess risk of pancreatic cancer, while no significant association emerged for pipe smoking and smokeless tobacco use.


Subject(s)
Pancreatic Neoplasms/etiology , Smoking/adverse effects , Tobacco, Smokeless/adverse effects , Adult , Aged , Aged, 80 and over , Case-Control Studies , Female , Humans , Male , Middle Aged , Risk , Tobacco Use Disorder
17.
J Surg Oncol ; 100(1): 8-12, 2009 Jul 01.
Article in English | MEDLINE | ID: mdl-19384918

ABSTRACT

BACKGROUND: There is a dearth of data in a younger population of patients with pancreatic ductal adenocarcinoma (PAC) regarding epidemiology, genetics, prognosis, and outcome. This report examines a large cohort of patients with PAC

Subject(s)
Adenocarcinoma/mortality , Pancreatic Neoplasms/mortality , Adenocarcinoma/pathology , Adult , Female , Humans , Male , Middle Aged , Neoplasm Staging , Pancreatic Neoplasms/pathology , Prognosis , Retrospective Studies
18.
Neuroscience ; 160(3): 639-50, 2009 May 19.
Article in English | MEDLINE | ID: mdl-19264111

ABSTRACT

Firing of an individual neuron is determined by the activity of its presynaptic input ensemble. In this study we analyzed how presynaptic signals with different dynamics interact to control postsynaptic activity. In the blowfly's visual system we simultaneously recorded in vivo from an identified motion-sensitive neuron and from elements of the presynaptic ensemble. The presynaptic cells themselves are mutually electrically coupled and convey both graded and spike signals to their common postsynaptic target. We elicited spikes in the postsynaptic neuron by voltage-clamping one of the presynaptic neurons to various holding potentials and then analyzed the time course of the holding current. Current transients in the clamped presynaptic cell were found to coincide with postsynaptic spikes. The current transients were highly variable in amplitude and occasionally absent during postsynaptic spiking. These characteristics indicate that the current transients in the voltage-clamped neuron result from spikes in electrically coupled co-members of the presynaptic ensemble. Our results suggest that electrical coupling among presynaptic neurons mediates synchronization of spikes within the cell ensemble. Moreover, our findings demonstrate that the graded response component of the presynaptic cells effectively controls the postsynaptic firing rate on a coarse scale while the precise timing of the postsynaptic spikes is a consequence of spikes superimposed on the graded signals of the presynaptic neurons.


Subject(s)
Action Potentials , Diptera/physiology , Motion Perception/physiology , Neurons/physiology , Synaptic Transmission/physiology , Animals , Brain/physiology , Electric Stimulation , Electrical Synapses , Female , Membrane Potentials/physiology , Patch-Clamp Techniques , Probability , Time Factors
19.
Neuroscience ; 146(2): 573-83, 2007 May 11.
Article in English | MEDLINE | ID: mdl-17367948

ABSTRACT

Motion-sensitive neurons in the blowfly brain present an ideal model system to study the cellular mechanisms and functional significance of adaptation to visual motion. Various adaptation processes have been described, but it is still largely unknown which of these processes are generated in the motion-sensitive neurons themselves and which originate at more peripheral processing stages. By input resistance measurements I demonstrate that direction-selective adaptation is generated by an activity-dependent conductance increase in the motion-sensitive neurons. Based on correlations between dendritic Ca(2+) accumulation and slow hyperpolarizing after-potentials following excitatory stimulation, a regulation of direction-selective adaptation by Ca(2+) has previously been suggested. In the present study, however, adaptation phenomena are not evoked when the cytosolic Ca(2+) concentration is elevated by ultraviolet photolysis of caged Ca(2+) in single neurons rather than by motion stimulation. This result renders it unlikely, that adaptation in fly motion-sensitive neurons is regulated by bulk cytosolic Ca(2+).


Subject(s)
Adaptation, Physiological/physiology , Motion Perception/physiology , Neurons/physiology , Orientation/physiology , Animals , Brain/cytology , Calcium/metabolism , Calcium Signaling/physiology , Dendrites/physiology , Electric Impedance , Female , Insecta , Membrane Potentials/physiology , Models, Neurological , Neurons/classification , Neurons/cytology , Patch-Clamp Techniques/methods , Photic Stimulation/methods , Photolysis
20.
J Refract Surg ; 22(3): 293-302, 2006 Mar.
Article in English | MEDLINE | ID: mdl-16602319

ABSTRACT

PURPOSE: Refractive consequences of corneal transplants are analyzed using corneal biomechanical models assuming homogeneous and inhomogeneous stiffness distributions across the cornea. Additionally, refractive effects of grafts combined with volume removal procedures are also evaluated to develop methods to reduce postoperative refractive management of patients. METHODS: Refinements of a two-dimensional finite element model are applied to simulate the biomechanical and refractive effects of different corneal transplant procedures: anterior lamellar keratoplasty, posterior lamellar keratoplasty, and penetrating keratoplasty. The models are based on a nonlinearly elastic, isotropic formulation. Predictions are compared with published clinical data. RESULTS: The model simulating the penetrating keratoplasty procedure predicts more change in the postoperative corneal curvature than models simulating anterior lamellar keratoplasty or posterior lamellar keratoplasty procedures. When a lenticle-shaped tissue with a central thickness of 50 microns and a diameter of 4 mm is removed from the anterior corneal surface along with the anterior lamellar keratoplasty or posterior lamellar keratoplasty, the models predict a refractive correction of -8.6 and -8.9 diopters, respectively. CONCLUSIONS: Simulations indicate that a posterior lamellar keratoplasty procedure is preferable for obtaining a better corneal curvature profile, eliminating the need for specific secondary treatments.


Subject(s)
Cornea/physiopathology , Corneal Transplantation/physiology , Models, Biological , Biomechanical Phenomena , Cornea/surgery , Finite Element Analysis , Humans , In Vitro Techniques , Predictive Value of Tests , Refraction, Ocular/physiology
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