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Is Routine Use of Head CT in Evaluation of Craniosynostosis Necessary? J Oral Maxillofac Surg 2020. [DOI: 10.1016/j.joms.2020.07.045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Deliberating performance targets workshop: Potential paths for emerging PM 2.5 and O 3 air sensor progress. ATMOSPHERIC ENVIRONMENT: X 2019; 2:100031. [PMID: 34322666 PMCID: PMC8314253 DOI: 10.1016/j.aeaoa.2019.100031] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The United States Environmental Protection Agency held an international two-day workshop in June 2018 to deliberate possible performance targets for non-regulatory fine particulate matter (PM2.5) and ozone (O3) air sensors. The need for a workshop arose from the lack of any market-wide manufacturer requirement for Ozone documented sensor performance evaluations, the lack of any independent third party or government-based sensor performance certification program, and uncertainty among all users as to the general usability of air sensor data. A multi-sector subject matter expert panel was assembled to facilitate an open discussion on these issues with multiple stakeholders. This summary provides an overview of the workshop purpose, key findings from the deliberations, and considerations for future actions specific to sensors. Important findings concerning PM2.5 and O3 sensors included the lack of consistent performance indicators and statistical metrics as well as highly variable data quality requirements depending on the intended use. While the workshop did not attempt to yield consensus on any topic, a key message was that a number of possible future actions would be beneficial to all stakeholders regarding sensor technologies. These included documentation of best practices, sharing quality assurance results along with sensor data, and the development of a common performance target lexicon, performance targets, and test protocols.
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The Use of Inhaled Nitric Oxide versus Inhaled Epoprostenol in High Risk Lung Transplant Recipients. J Heart Lung Transplant 2018. [DOI: 10.1016/j.healun.2018.01.1196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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Low intensity transcranial electric stimulation: Safety, ethical, legal regulatory and application guidelines. Clin Neurophysiol 2017; 128:1774-1809. [PMID: 28709880 PMCID: PMC5985830 DOI: 10.1016/j.clinph.2017.06.001] [Citation(s) in RCA: 627] [Impact Index Per Article: 89.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2017] [Revised: 05/29/2017] [Accepted: 06/06/2017] [Indexed: 12/11/2022]
Abstract
Low intensity transcranial electrical stimulation (TES) in humans, encompassing transcranial direct current (tDCS), transcutaneous spinal Direct Current Stimulation (tsDCS), transcranial alternating current (tACS), and transcranial random noise (tRNS) stimulation or their combinations, appears to be safe. No serious adverse events (SAEs) have been reported so far in over 18,000 sessions administered to healthy subjects, neurological and psychiatric patients, as summarized here. Moderate adverse events (AEs), as defined by the necessity to intervene, are rare, and include skin burns with tDCS due to suboptimal electrode-skin contact. Very rarely mania or hypomania was induced in patients with depression (11 documented cases), yet a causal relationship is difficult to prove because of the low incidence rate and limited numbers of subjects in controlled trials. Mild AEs (MAEs) include headache and fatigue following stimulation as well as prickling and burning sensations occurring during tDCS at peak-to-baseline intensities of 1-2mA and during tACS at higher peak-to-peak intensities above 2mA. The prevalence of published AEs is different in studies specifically assessing AEs vs. those not assessing them, being higher in the former. AEs are frequently reported by individuals receiving placebo stimulation. The profile of AEs in terms of frequency, magnitude and type is comparable in healthy and clinical populations, and this is also the case for more vulnerable populations, such as children, elderly persons, or pregnant women. Combined interventions (e.g., co-application of drugs, electrophysiological measurements, neuroimaging) were not associated with further safety issues. Safety is established for low-intensity 'conventional' TES defined as <4mA, up to 60min duration per day. Animal studies and modeling evidence indicate that brain injury could occur at predicted current densities in the brain of 6.3-13A/m2 that are over an order of magnitude above those produced by tDCS in humans. Using AC stimulation fewer AEs were reported compared to DC. In specific paradigms with amplitudes of up to 10mA, frequencies in the kHz range appear to be safe. In this paper we provide structured interviews and recommend their use in future controlled studies, in particular when trying to extend the parameters applied. We also discuss recent regulatory issues, reporting practices and ethical issues. These recommendations achieved consensus in a meeting, which took place in Göttingen, Germany, on September 6-7, 2016 and were refined thereafter by email correspondence.
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Visual Steering and Verification of Mass Spectrometry Data Factorization in Air Quality Research. IEEE TRANSACTIONS ON VISUALIZATION AND COMPUTER GRAPHICS 2012; 18:2275-2284. [PMID: 26357135 DOI: 10.1109/tvcg.2012.280] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The study of aerosol composition for air quality research involves the analysis of high-dimensional single particle mass spectrometry data. We describe, apply, and evaluate a novel interactive visual framework for dimensionality reduction of such data. Our framework is based on non-negative matrix factorization with specifically defined regularization terms that aid in resolving mass spectrum ambiguity. Thereby, visualization assumes a key role in providing insight into and allowing to actively control a heretofore elusive data processing step, and thus enabling rapid analysis meaningful to domain scientists. In extending existing black box schemes, we explore design choices for visualizing, interacting with, and steering the factorization process to produce physically meaningful results. A domain-expert evaluation of our system performed by the air quality research experts involved in this effort has shown that our method and prototype admits the finding of unambiguous and physically correct lower-dimensional basis transformations of mass spectrometry data at significantly increased speed and a higher degree of ease.
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Interactions between Entamoeba histolytica, bacteria and intestinal cells. CIBA FOUNDATION SYMPOSIUM 2008; 99:2-30. [PMID: 6315320 DOI: 10.1002/9780470720806.ch2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Axenically grown pathogenic and non-pathogenic isolates of Entamoeba histolytica have been shown to adhere to mammalian epithelial cells and bacteria by virtue of carbohydrate-binding proteins present on their cell surfaces. The interaction of amoeba isolates of low pathogenicity with a variety of gram-negative bacteria, mainly Escherichia coli strains which are readily ingested by the amoebae after relatively short periods, significantly increased the ability of the trophozoites to: (a) destroy and ingest intestinal epithelial cells; (b) secrete a cytopathic substance which morphologically affects a variety of tissue-cultured cells; and (c) cause hepatic abscesses in hamsters. Addition of carbohydrates that inhibit the lectin-mediated attachment of bacteria to amoebae prevented the enhancement of virulence. Interaction of the amoebae with bacteria that were heat-inactivated, glutaraldehyde-fixed or disrupted by sonication, as well as with bacteria precoated with antibodies or concanavalin A, did not lead to an increase in virulence. Moreover, short prior treatments of the bacteria with inhibitors of protein synthesis, but not with cell-wall synthesis inhibitors, also prevented the stimulation. The results indicate that interactions of amoebae with certain bacteria may be responsible for the increase in amoebic virulence.
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Patient wishes and physician inquiries regarding spiritual needs in an urban cancer center. J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.8630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
8630 Background: Prior studies have shown much interest in spirituality among patients in the rural South, but little is known about the spiritual needs and views of urban cancer patients. Methods: In Jan-Feb 2005, consecutive outpatients were asked to complete a questionnaire at the St. Vincent’s Comprehensive Cancer Center in New York City. The instrument included the QUEST satisfaction scale, demographic and clinical information, and questions about spiritual and religious beliefs and needs. Tests of association included correlation, t-tests, and χ2. Multivariate models were estimated using logistic techniques. Results: Of the 891 eligible patients, 81 refused, 428 cancelled their appointments or left before being approached. 13 were excluded because of incomplete questionnaires. The 369 participants had a mean age of 57.5 years; 65% were women, 67% white, 65% college-educated, 32% had breast cancer, and 67% were privately insured. Forty-seven percent were Catholic, 19% Jewish, 16% Protestant, and 6% atheist or agnostic. Sixty-six percent reported being “spiritual but not religious,” and 29% attended religious services at least once per week. Nine percent reported that staff had inquired about their spiritual or religious beliefs (0.6% by an MD), and 6% reported inquiries about their spiritual needs (0.9% by an MD). But, 82% reported that their spiritual needs were being met, and being asked about neither religious beliefs (p = .37) nor spiritual needs (p = .72) was associated with satisfaction. Still, 52% thought it appropriate for physicians to inquire about their religious beliefs and 58% thought it appropriate for physicians to inquire about their spiritual needs. Patients who described themselves as “spiritual but not religious” were less likely to think it appropriate for an MD to inquire about their religious beliefs (OR = 0.48, CI = 0.28 to 0.84), while those who attended religious services at least weekly were more likely to think it appropriate (OR = 2.86, CI = 1.45 to 5.62). Conclusions: A majority of patients thought it appropriate to be asked about their spiritual and religious beliefs and needs, but less than that reported in other settings. Few had these needs addressed by staff, especially by MDs. More religious patients were more likely to think such inquiries appropriate. No significant financial relationships to disclose.
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Huntington disease. J R Soc Med 2006. [DOI: 10.1258/jrsm.99.2.53-a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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SU-FF-I-10: Evaluation of a Micro-CT Scanner Applied to the Characterization of Pulmonary Architecture in the Rat. Med Phys 2005. [DOI: 10.1118/1.1997490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Computer-assisted navigational surgery enhances safety in dental implantology. ANNALS OF THE ACADEMY OF MEDICINE, SINGAPORE 2005; 34:383-8. [PMID: 16021229] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
INTRODUCTION Dental implants are increasingly used to restore missing dentition. These titanium implants are surgically installed in the edentulous alveolar ridge and allowed to osteointegrate with the bone during the healing phase. After osseo-integration, the implant is loaded with a prosthesis to replace the missing tooth. Conventional implant treatment planning uses study models, wax-ups and panoramic x-rays to prefabricate surgical stent to guide the preparation of the implant site. The drilling into the alveolar ridge is invariably a "blind" procedure as the part of the drill in bone is not visible. Stereotactic systems were first introduced into neurosurgery in 1986. Since then, computer-assisted navigational technology has brought major advances to neuro-, midface and orthopaedic surgeries, and more recently, to implant placement. CLINICAL FEATURE This paper illustrates the use of real-time computer-guided navigational technology in enhancing safety in implant surgical procedures. OUTCOME AND CONCLUSION Real-time computer-guided navigational technology enhances accuracy and precision of the surgical procedure, minimises complications and facilitates surgery in challenging anatomical locations.
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Resection of mandibular low-grade malignant tumors using an image guided navigation system. Int J Oral Maxillofac Surg 2005. [DOI: 10.1016/s0901-5027(05)80956-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Comparison of balloon dacryocystoplasty to probing as the primary treatment of congenital nasolacrimal duct obstruction. J AAPOS 2001; 5:139-42. [PMID: 11404738 DOI: 10.1067/mpa.2001.115218] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
PURPOSE In children older than 18 months, primary probing procedures for congenital nasolacrimal duct obstruction (CNLDO) are thought to have lower rates of success. This study compares the results of primary probing to balloon dacryocystoplasty (DCP) in children stratified by age category. METHODS In a retrospective chart review, 29 eyes with CNLDO that underwent balloon DCP in children older than 18 months were identified and age-matched to 29 eyes that underwent probing. The eyes were divided into 3 age categories: category 1 (18-24 months), category 2 (24-36 months), and category 3 (>36 months). RESULTS Of the 29 eyes treated with balloon DCP (mean age, 37.1 months), 26 were successfully treated. Twenty-five of the 29 matched probed eyes (mean age, 31.1 months) were successfully treated, resulting in an overall success rate of 90% for balloon DCP and 86% for primary probing. Within each age category, the success rate varied but did not show an advantage to balloon DCP. The presence of crusting and expressible discharge from the puncta during preoperative evaluation predicted a successful probing (OR, 16; 95% CI, 1.3-192). CONCLUSION Overall, balloon DCP did not appear to present an advantage as compared with primary probing as the initial treatment in these children. Primary probing has an impressive overall success rate that did not diminish in the children older than 36 months.
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Neuropsychological impairment from acute low-level exposure to carbon monoxide. ARCHIVES OF NEUROLOGY 1998; 55:845-8. [PMID: 9626776 DOI: 10.1001/archneur.55.6.845] [Citation(s) in RCA: 71] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
OBJECTIVE To investigate the effects of acute low-level exposure to carbon monoxide on higher cognitive functions in healthy humans. DESIGN An empirical study of the effects of low-level exposure to carbon monoxide on higher cognitive functions in young healthy volunteers and a matched nonexposed control group. SETTING A dormitory at the Hebrew University campus in Jerusalem, Israel. PARTICIPANTS Forty-five student volunteers who were exposed to carbon monoxide from residential kerosene stoves for 1.5 to 2.5 hours (air carbon monoxide concentrations of 17-100 ppm; mean +/- SD, 61 +/- 24 ppm) served as the experimental group and 47 nonexposed students served as the control group. MAIN OUTCOME MEASURES A battery of neuropsychological tests was administered to each participant including digit span, the revised Wechsler Memory Scale for verbal and figural memory, Trail-Making Test parts A and B, digit symbol, block design, and the Rey Auditory Verbal Learning Test. RESULTS Venous blood carboxyhemoglobin (Hbco) levels in participants of the study group ranged from 0.01 to 0.11 (mean +/- SD, 0.04 +/- 0.03) and correlated with air carbon monoxide concentrations (r = 0.39; P = .01). The experimental group scored significantly lower than controls on the following tests: digit span forward (P = .02), short-term (P = .008) and long-term semantic memory (P = .008), digit symbol (P = .004), block design (P = .009), recall of figural memory (P = .02), and Trail-Making part A (P = .04). No significant differences were found between the experimental and control groups in other tests. CONCLUSIONS The lower scores on neuropsychological tests indicate dysfunctions in memory, new learning ability, attention and concentration, tracking skills, visuomotor skills, abstract thinking, and visuospatial planing and processing. These dysfunctions correspond with previous reports of carbon monoxide neurotoxic effects in patients with moderate carbon monoxide poisoning. Low-level exposure to carbon monoxide results in impairment of higher cognitive functions. Neuropsychological testing appears to be sensitive in the detection of subtle neurologic dysfunctions resulting from carbon monoxide poisoning.
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Abstract
Three cases of cutis aplasia are presented. The defects involved include full-thickness defects of scalp and cranium as well as full-thickness skin defects of the abdomen and thigh. All patients were treated conservatively with the use of Silvadene cream dressings. Healing was obtained in all patients.
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Electrical impedance imaging in two and three dimensions. CLINICAL PHYSICS AND PHYSIOLOGICAL MEASUREMENT : AN OFFICIAL JOURNAL OF THE HOSPITAL PHYSICISTS' ASSOCIATION, DEUTSCHE GESELLSCHAFT FUR MEDIZINISCHE PHYSIK AND THE EUROPEAN FEDERATION OF ORGANISATIONS FOR MEDICAL PHYSICS 1988; 9 Suppl A:29-33. [PMID: 3240646 DOI: 10.1088/0143-0815/9/4a/006] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
This paper describes an algorithm for electrical impedance imaging that makes no prior assumptions about current flow paths. It involves the solution of Poisson's equation for inhomogeneous media with an explicit conductivity-updating scheme that is not subject to matrix ill-conditioning problems. Sparse matrices are employed throughout and so a large number of pixels may be accommodated. A three-dimensional laboratory experiment, with top-surface measurements only, is described. A submerged metallic object is imaged with error believed due to poor modelling of fields in the vicinity of the physical electrodes. The algorithm requires a large number of conductivity-updating iterations and so schemes must be considered for a substantial reduction in this number.
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Changes in isoenzyme patterns of a cloned culture of nonpathogenic Entamoeba histolytica during axenization. Infect Immun 1986; 54:827-32. [PMID: 2877951 PMCID: PMC260244 DOI: 10.1128/iai.54.3.827-832.1986] [Citation(s) in RCA: 87] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
The axenization of an Entamoeba histolytica isolate with a nonpathogenic isoenzyme electrophoretic pattern (zymodeme) was recently achieved for the first time (15). Forty days after the cells were transferred to the medium used for axenic cultivation, the amebae developed virulence properties, and the zymodeme converted to a pathogenic pattern. To exclude the possibility that the original isolate consisted of two zymodeme populations and that conditions of growth selected for a particular population, the experiment was repeated with a cloned culture of a nonpathogenic (zymodeme III) strain, E. histolytica SAW 1734R clAR, isolated by and obtained from P. G. Sargeaunt. Axenization was accomplished, as before, by transferring trophozoites to TYI-S-33 medium containing a mixture of antibiotics to suppress the growth of the associated bacterial flora and a nutritional supplement consisting of gamma-irradiated bacteria. A change in the hexokinase and phosphoglucomutase isoenzyme pattern was observed 21 days after the amebae had been transferred to the axenic medium but before complete axenization of the amebae had occurred. The change in zymodeme was accompanied by an increase in virulence, as evidenced by the ability of fewer amebae to induce hepatic abscesses in hamsters. A reverse conversion to a nonpathogenic zymodeme was also accomplished by reassociating and subculturing the newly converted pathogenic trophozoites of strain SAW 1734R clAR with the bacterial flora that accompanied this ameba in the original xenic culture. The electromobilities of the hexokinase isoenzymes changed back to their original pattern 7 days after the amebae were returned to xenic growth conditions. Our in vitro results demonstrate that culture conditions and bacterial flora can cause changes in the zymodeme and virulence of a cloned ameba isolate and raise the concern that this could happen also in vivo. Thus, the finding of a particular zymodeme in a culture of E. histolytica isolated from a carrier should not be used to predict a clinical condition or serve as a basis for the recommendation of therapy.
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Isolation, purification, and partial characterization of an enterotoxin from extracts of Entamoeba histolytica trophozoites. Infect Immun 1985; 48:211-8. [PMID: 2858451 PMCID: PMC261937 DOI: 10.1128/iai.48.1.211-218.1985] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Soluble cell-free extracts of pathogenic Entamoeba histolytica, as well as serum-free minimal media in which trophozoites are incubated, contain substances that cause the rapid rounding up and detachment of tissue-cultured monolayers of mammalian cells (cytopathic activity) and induce fluid secretion in ligated intestinal loops of indomethacin-pretreated rats (enterotoxic activity). A semiquantitative assay for the determination of the cytopathic activity based on the rate of detachment of tissue-cultured baby hamster kidney cells was developed. Two peaks containing cytopathic activity were obtained upon gel filtration of the soluble extracts: peak I, with over 60% of the activity, emerged in the 30,000 to 50,000 molecular weight region, and peak II, containing the remaining activity, was in the 15,000 to 25,000 molecular weight region. The activity of peak I was found to be heat labile and inhibited by sialoglycoproteins such as fetuin and mucin (5 mg/ml), as well as by sialic acid. Protease inhibitors such as antitrypsin, pepstatin, phenylmethylsulfonyl fluoride, metaloprotease inhibitors, and bacitracin had no effect on the cytopathic activity. Marked inhibition of cytopathic activity was observed, however, with iodoacetamide and p-chloromercuribenzoate, which affect sulfhydryl groups. The toxic material in peak II was found to have ionophoric activity and was not inhibited by sialic acid-containing compounds. The materials from both peaks had enterotoxic activity in intestinal ligated loops. The active substance from peak I was further purified (200X) on an agarose-fetuin affinity column, yielding one major protein band with an apparent molecular weight of ca. 30,000 on sodium dodecyl sulfate. Amino acid analysis revealed that the protein was very poor in sulfur amino acids. The sialic acid-sensitive toxic activity was higher in known virulent strains such as HM-1:IMSS and could be markedly augmented after preincubation of the trophozoites with certain Escherichia coli strains.
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Letter: Fluorine control of regioselectivity in photocycloaddition reactions. The direct functionalization of uracil via a novel 1,4-fragmentation. J Am Chem Soc 1976; 98:1602-4. [PMID: 1249371 DOI: 10.1021/ja00422a066] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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Dental research at McGill--a survey. THE MCGILL DENTAL REVIEW 1969; 32:5-6. [PMID: 5268556] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Exponential Temperature Dependence of the Electronic Specific Heat of Superconducting Vanadium. ACTA ACUST UNITED AC 1954. [DOI: 10.1103/physrev.96.1442.2] [Citation(s) in RCA: 45] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Relative humidity-temperature relationships of some saturated salt solutions in the temperature range 0 degree to 50 degrees C. J Res Natl Bur Stand (1977) 1954. [DOI: 10.6028/jres.053.003] [Citation(s) in RCA: 297] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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