68 results on '"L. Weingarten"'
Search Results
2. P254 The lasting impact of the COVID 19 pandemic on sexual health care in a metropolitan region
- Author
-
Anne Trolard, Hel Reno, Joseph N. Cherabie, and L Weingarten
- Subjects
medicine.medical_specialty ,Chlamydia ,Coronavirus disease 2019 (COVID-19) ,business.industry ,Public health ,medicine.disease ,Metropolitan area ,Underinsured ,Environmental health ,Pandemic ,Health care ,medicine ,business ,Reproductive health - Abstract
Background In the US, health policies accompanying the COVID-19 pandemic led to restricted healthcare access and decreased clinical services. Low public health funding was a barrier to accessing sexual healthcare before the pandemic and intensified during restrictions. Surveillance of the sexual healthcare landscape can inform program development to improve sexual health. Methods We collected information from clinics offering STI testing in the St. Louis region, Missouri, USA twice during 2020: in the spring during the first pandemic lockdown and in the fall as restrictions eased. Clinics were interviewed about sexual health services and categorized into three categories: open fully with no changes; modified if hours open and/or the ability to accept walk-ins were reduced; or fully closed. We also collected chlamydia rates by zip code and categorized zip codes as low (0–174 cases per 100,000); medium (175–653); or high (654–1291) prevalence. Results Of the 112 clinics, 47 are federally qualified health centers (serve the un-and underinsured); 16 were local public health authorities; and the remaining 49 include community, school, and private settings. In the fall, 29% of clinics were open, 55% modified, 5% closed compared with spring when 7% of clinics were open, 63% were modified, 17% were closed. There was a 450% and 200% increase in the number of clinics that were open in high and medium prevalence zip codes respectively in the fall compared to the spring. Forty-nine clinics remain modified or closed in medium and high prevalence zip codes. Discussion The COVID pandemic has a significant effect on sexual health care in a metropolitan region of the US; that effect is lasting, especially in areas of medium and high chlamydia rates. Health systems must consider how the pandemic has impacted care provided for all major public health problems, including STIs/HIV or risk worsening sexual health.
- Published
- 2021
3. An intervention to improve the oral health of residents in an aged care facility led by nurses
- Author
-
J Plain, L Boivin, L Weingarten, M Kay, and Fiona A Blinkhorn
- Subjects
Psychomotor learning ,medicine.medical_specialty ,education.field_of_study ,business.industry ,medicine.medical_treatment ,media_common.quotation_subject ,Population ,Public Health, Environmental and Occupational Health ,Oral health ,Focus group ,Mental health ,stomatognathic diseases ,Nursing ,Hygiene ,Family medicine ,Intervention (counseling) ,medicine ,Dentures ,education ,business ,media_common - Abstract
Introduction: The growing population of elderly people is impacting on overstretched dental services in many countries, as many individuals are retaining natural teeth and may have dentures or implants, all of which influence the way in which the oral cavity must be cared for. A major difficulty for older residents is their decreasing level of motor and cognitive functioning to adequately self-care for their mouths. Hence, the role of the nurse is crucial. However, staff shortages, time factors and lack of awareness can lead to neglect of the mouth in this population. The loss of function is often exacerbated in individuals with mental health problems. Objectives: To improve the oral health of residents in an aged care mental health unit through the introduction of an innovative nursing intervention. Methods: Firstly, utilizing focus groups, nursing staff identified the main barriers to delivery of oral hygiene to residents as follows: lack of proper equipment; no protocol in place; lack of knowledge. Staff knowledge of oral health and hygiene was measured using a structured questionnaire before and after the intervention. A training program was devised by a dentist, dietician and nurse working in the unit. A multidisciplinary team met on several occasions to design a suitable vehicle and process to deliver oral hygiene. Oral health examinations were conducted at baseline, three months and 12 months. Interventions: Design and production of oral hygiene trolley; development of protocol for oral hygiene; staff education in oral health. Results: The program was successful in improving the oral health of residents with reductions in plaque scores, gingivitis and pocket depths. The oral hygiene protocol was positively accepted into a daily routine and the knowledge of staff in matters relating to oral health increased. Conclusions: A simple oral health intervention utilizing qualified nurses and a purpose-built oral hygiene trolley made significant improvements to the oral health of aged care residents.
- Published
- 2011
4. Family Feud
- Author
-
Allen L. Weingarten
- Subjects
Finance ,Economics and Econometrics ,Principal (commercial law) ,Social venture capital ,business.industry ,Feud ,media_common.quotation_subject ,Venture capital ,business ,Function (engineering) ,Investment management ,media_common - Abstract
Whenever the pie shrinks, there are more fights over how it is divided. This has become an increasing problem for professionals who manage the general partners and investment managers of venture capital funds. With a greater number of disputes, a host of problems in the agreements among principals is often exposed. Ambiguities and deficiencies in the agreements make dealing with disputes more difficult than it would otherwise be. Although the primary purpose of these agreements is the division of profits, another important function is to determine how to unwind the relationship. This article presents the issues that should be discussed prior to the termination or withdrawal of a principal.
- Published
- 2003
5. Measuring magnetic fields in single aluminum wire plasmas with time-resolved optical spectroscopy
- Author
-
Yu. Zarnitsky, K. S. Blesener, S. A. Pikuz, Isaac Blesener, T. A. Shelkovenko, Rami Doron, L. Weingarten, David Hammer, Yitzhak Maron, and Vladimir Bernshtam
- Subjects
Nuclear and High Energy Physics ,Electron density ,Radiation ,Materials science ,Plasma ,Magnetic field ,symbols.namesake ,Stark effect ,Ionization ,symbols ,Emission spectrum ,Atomic physics ,Spectroscopy ,Doppler broadening - Abstract
Using time-resolved emission spectroscopy at visible wavelengths, we explored the conditions of plasmas generated by current-driven explosions of single aluminum wires. The experiments were carried out with 15 μm aluminum wires driven by the Low Current Pulser 3 (LCP3) at Cornell University.The plasma conditions were studied as a function of time and radial position, including electron temperature, electron density, ionization state, and magnetic field. To determine the magnetic field, we are working toward employing a new diagnostic method which makes use of Zeeman-effect-produced differences in the line shapes of two fine structure components of a multiplet that are equally broadened by Stark effect and by Doppler broadening. Preliminary results and data collected by a spectroscopy system with 3.2 A resolution are presented.
- Published
- 2012
6. When Limited Partners Default
- Author
-
Jay S. Rang and Allen L. Weingarten
- Subjects
Limited partnership ,Economics and Econometrics ,Actuarial science ,Market economy ,General partnership ,Equity (finance) ,Economics ,Venture capital ,Finance - Abstract
As equity markets continue to struggle, the prospect of having limited partners default on their capital contributions becomes more of a possibility. Many venture capitalists are quite concerned about certain portions of their partnership agreements, such as the flexibility allowed the general partner to make investments, but far less concerned about the penalty provisions in caseof default. This article outlines possible courses of action and discusses which ones make the most sense in different circumstances.
- Published
- 2002
7. Mean specific intensity of radiation in cylindrical and spherical plasmas
- Author
-
L. Weingarten, I.R. Almiev, Yitzhak Maron, and V. Fisher
- Subjects
Physics ,Quantum state ,Ionization ,Plasma ,Photoionization ,Electrical and Electronic Engineering ,Radiation ,Atomic physics ,Condensed Matter Physics ,Radiant intensity ,Atomic and Molecular Physics, and Optics ,Spectral line ,Ion - Abstract
We present an easy-to-use formula for mean (space- and direction-average) specific intensity of radiation in uniform spherical and cylindrical plasmas, which are not under external irradiation. This formula has high accuracy in any spectral interval dν taken in continuum as well as within a spectral line of any profile, including overlapping lines and lines on a pedestal of intense continuum in any spectral range. The formula considerably accelerates self-consistent computations of the radiation field and the distribution of ions over their ionization degrees and quantum states. It may also be used for computations of any radiation dependent-quantity, for example, the photoionization probability.
- Published
- 2009
8. Investigation of the hydromotion and ion and electron temperatures of stagnating Z-pinch plasma using time- and space-resolved K-line spectra
- Author
-
A. Starobinets, D. Osin, Ingo Uschmann, Vladimir Benrshtam, Eyal Kroupp, Dror Alumot, Evgeny Stambulchik, L. Weingarten, Yitzhak Maron, and Amnon Fisher
- Subjects
Electron density ,Materials science ,Physics::Plasma Physics ,Plasma parameters ,Z-pinch ,Pinch ,Electron temperature ,Plasma diagnostics ,Atomic physics ,Spectral line ,Doppler broadening - Abstract
Summary form only given. Even though the physics of Z-pinch systems is understood in general, there is a severe lack of detailed experimental data on the thermalization processes and dynamics that govern the pinch behaviour, and on the plasma parameters during the stagnation phase. Here, we report on a novel spectroscopic system, used to determine temporally-resolved ion kinetic energy and temperature, electron temperature and density, and spatial correlation between different charge-states species of the stagnating plasma. We use a neon Z-pinch, imploding under a 500-kA, 500-ns current pulse, and observe a hot-and-dense plasma core stagnating on axis for ~10 ns, emitting ~1 kJ of radiation. A two-spectrometer diagnostic system is employed, simultaneously recording two groups of optically-thin lines: He-like satellites to Lyα and high-n H-like Lyδ and Lye lines, with ultra-high spectral, temporal and spatial resolutions. All data are axially imaged across the stagnation column. The ion temperature is obtained simultaneously from the Stark broadening of hydrogenic-line emission and from the Doppler broadening measurements coupled with energy-balance considerations, and is found to be substantially lower than the hydrodynamic-motion energy. Furthermore, the two-spectrometer system provides a unique insight into the temporal and spatial correlations between the intensities of the spectral lines emitted by different ionic charge-states in the stagnating plasma. Together with kinetics modeling and argumentation, these measurements allow for inferring space-and time-resolved electron density and temperature. This also includes determining the gradients of the electron temperature, and the mechanism of populating the doubly-excited states, along the pinch column.
- Published
- 2013
9. Physical-hybrid simulation for in-situ evaluation of energy storage system
- Author
-
Nicholas Etherden, Math Bollen, and L. Weingarten
- Subjects
Engineering ,business.industry ,Load balancing (electrical power) ,Grid ,Automotive engineering ,Energy storage ,Stand-alone power system ,Smart grid ,Base load power plant ,Distributed generation ,Grid-connected photovoltaic power system ,Electronic engineering ,business ,Computer Science::Distributed, Parallel, and Cluster Computing - Abstract
This paper presents a method for testing of a grid-size battery energy storage system and its interaction with the grid. The method uses a real installation with relatively small storage capacity which is combined with a simulation model of the grid. The storage is cycled based on measurements from the potential grid location and desired application. A scaling factor is used to relate the physical installation capacity and power ratings with the grid-size storage in the simulation model. Such a hybrid method allows evaluating grid-size storage installations without disturbing the grid. The physical behavior of the battery and control algorithm can be evaluated under realistic conditions without the need to construct a full grid-size storage installation. An experiment is described in this paper were the method is applied to an actual grid and battery storage installation.
- Published
- 2012
10. Visible spectroscopy characterization of aluminum X pinch plasmas
- Author
-
Vladimir Bernshtam, Yu. Zarnitsky, Yitzhak Maron, Eyal Kroupp, Isaac Blesener, R. Doron, L. Weingarten, K. S. Blesener, and D. A. Hammer
- Subjects
Electron density ,symbols.namesake ,Materials science ,Zeeman effect ,Z-pinch ,Rise time ,Pinch ,symbols ,Plasma diagnostics ,Plasma ,Atomic physics ,Magnetic field - Abstract
Summary form only given. We are initiating an experiment in which time resolved visible spectroscopy will be used to characterize the plasma in and near the minidiode in aluminum (Al) X pinches. The goal of the experiment is to determine the magnetic field and other plasma conditions near the outer radius of the imploding z-pinch in the minidiode. At this location the conditions should be suitable for a magnetic field measurement using the Al doublet previously used for Zeeman Broadening measurements at the Weizmann Institute of Science.1 We will be studying 2-wire and hybrid X pinches on the 13kA 430ns rise time Low Current Pulser 3 (LCP3), the 20kA 200ns rise time Low Current Pulser 4 (LCP4), and at ≥ 200kA on the 50ns rise time XP generator. By using various pulsers and current levels we aim to study directly the impact that the driving current has on the development of the minidiode of the X pinch, the magnetic field, the electron temperature, and the electron density as a function of time and space. Preliminary results will be presented.
- Published
- 2012
11. Investigation of the dynamics of stagnating high-energy-density plasma using a novel technique for the determination of the ion temperature
- Author
-
Vladimir Benrshtam, D. Osin, Eyal Kroupp, Yitzhak Maron, Ingo Uschmann, A. Starobinets, Evgeny Stambulchik, Dror Alumot, L. Weingarten, and Amnon Fisher
- Subjects
Electron density ,Materials science ,chemistry.chemical_element ,Plasma ,Temperature measurement ,Ion ,symbols.namesake ,Neon ,Stark effect ,chemistry ,Physics::Plasma Physics ,symbols ,Plasma diagnostics ,Atomic physics ,Doppler broadening - Abstract
Summary form only given. The thermalization and energy conversion to radiation in high-energy-density plasma is a topic of broad interest in laboratory plasmas and in astrophysics. Knowledge of the ion temperature is of decisive importance, since this parameter determines the rate of various processes, including that of the energy transfer to electrons. We here report on the development of a novel spectroscopic method for determining the ion temperature in the stagnating plasma, based on the Stark broadening of hydrogenic-line emission from moderately-coupled ions in the stagnating plasma. We use a neon Z-pinch, imploding under a 500-kA, 500-ns current pulse. Two spectroscopic systems with ultra-high-resolutions in spectrum, space, and time are employed simultaneously. A major emphasis has been put on measurements of the spectra of two different optically-thin lines: satellites to Lyα and Lyδ. While the optical thinness is invaluable in diagnosing the ion velocity distribution, the electron density, and the ion temperature, the low-intensity of such lines required the use of toroidal crystals, for enhancing the light-collection efficiency. All data were axially imaged across the stagnation column. We demonstrate the first employment of the spectroscopic method, which yields an ion temperature that is compared to previous measurements that were based on Doppler broadening and energy-balance considerations1,2. In addition, the data allowed for observing temporal and spatial correlations between the shapes of the various lines that are used to infer details of the distributions of the electron density and temperature in the stagnating column.
- Published
- 2012
12. Time resolved visible spectroscopy characterizations of single wire aluminum plasmas
- Author
-
D. A. Hammer, T. A. Shelkovenko, L. Weingarten, Yitzhak Maron, Vladimir Bernshtam, K. S. Blesener, and S. A. Pikuz
- Subjects
Electron density ,symbols.namesake ,Materials science ,Zeeman effect ,Stark effect ,symbols ,Electron temperature ,Plasma diagnostics ,Emission spectrum ,Atomic physics ,Magnetic field ,Doppler broadening - Abstract
The conditions within plasmas generated by current-driven explosions of single 15–50µm aluminum (Al) wires are being investigated using time-resolved emission spectroscopy at visible wavelengths. The experiments are being carried out at Cornell University on the 10kA, 500ns rise time Low Current Pulser 3 (LCP3). The plasma parameters being determined as a function of time and radial position include electron temperature and density, ionization state and magnetic field. To determine the magnetic field, a new diagnostic method is being developed which makes use of Zeeman-effect-produced differences in the line shapes of two fine structure components of a multiplet that are equally broadened by both Stark effect and Doppler broadening. This method has been demonstrated at the Weizmann Institute of Science (WSI) in laser-produced plasmas [1] with lower energy densities than are being studied here. As in the work at WSI, we use the Al III [4s–4p] transitions at 5696A and 5722A to determine the magnitude of the magnetic field. In the experimental plasmas generated by LCP3, electron number densities are in the range 1017–1018cm−3 while electron temperatures are between 2 and 5eV. Under these conditions, seen close to peak current 300 µm away from the wire, the line broadening due to a magnetic field of 6.5 T is calculated to be 3.0 A while the Stark broadening at 1018/cm3 is calculated to be 3.5 A; the Doppler broadening is negligible. The total FWHM difference of the doublet lines resulting from these mechanisms is estimated to be 10%. We are setting up a new spectroscopic system capable of clearly detecting this difference after carrying out preliminary experiments on a lower resolution system. Initial high-resolution data will be presented.
- Published
- 2011
13. Ion temperature and hydrodynamic-energy measurements in a Z-pinch plasma at stagnation
- Author
-
Eyal Kroupp, A. Starobinets, M. E. Cuneo, Yitzhak Maron, E. Förster, Amnon Fisher, V. Fisher, L. Weingarten, Ingo Uschmann, C. Deeney, John Giuliani, D. Osin, and Vladimir Bernshtam
- Subjects
Physics ,Plasma parameters ,business.industry ,General Physics and Astronomy ,Electron ,Plasma ,Dissipation ,Kinetic energy ,Ion ,Physics::Plasma Physics ,Z-pinch ,Physics::Space Physics ,Atomic physics ,business ,Thermal energy - Abstract
The time history of the local ion kinetic energy in a stagnating plasma was determined from Doppler-dominated line shapes. Using independent determination of the plasma properties for the same plasma region, the data allowed for inferring the time-dependent ion temperature, and for discriminating the temperature from the total ion kinetic energy. It is found that throughout most of the stagnation period the ion thermal energy constitutes a small fraction of the total ion kinetic energy; the latter is dominated by hydrodynamic motion. Both the ion hydrodynamic and thermal energies are observed to decrease to the electron thermal energy by the end of the stagnation period. It is confirmed that the total ion kinetic energy available at the stagnating plasma and the total radiation emitted are in balance, as obtained in our previous experiment. The dissipation time of the hydrodynamic energy thus appears to determine the duration (and power) of the K emission.
- Published
- 2011
14. Temperature andKα-yield radial distributions in laser-produced solid-density plasmas imaged with ultrahigh-resolution x-ray spectroscopy
- Author
-
Ingo Uschmann, Erik Brambrink, Eyal Kroupp, P. Audebert, Yu. Ralchenko, Vladimir Bernshtam, Evgeny Stambulchik, Eckhart Förster, Ulf Zastrau, Yitzhak Maron, A. Sengebusch, Gerd Röpke, R. Loetzsch, T. Kämpfer, L. Weingarten, and Heidi Reinholz
- Subjects
Massless particle ,Physics ,X-ray spectroscopy ,Photon ,Electron temperature ,Elementary particle ,Warm dense matter ,Atomic physics ,Spectroscopy ,Spectral line - Abstract
We study warm dense matter formed by subpicosecond laser irradiation at several ${10}^{19}\text{ }\text{W}/{\text{cm}}^{2}$ of thin Ti foils using x-ray spectroscopy with high spectral $(E/\ensuremath{\Delta}E\ensuremath{\sim}15,000)$ and one-dimensional spatial $(\ensuremath{\Delta}x=13.5\text{ }\ensuremath{\mu}\text{m})$ resolutions. $\text{Ti}\text{ }K\ensuremath{\alpha}$ doublets modeled by line-shape calculations are compared with Abel-inverted single-pulse experimental spectra and provide radial distributions of the bulk-electron temperature and the absolute-photon number $K\ensuremath{\alpha}$ yield in the target interiors. A core with $\ensuremath{\sim}40\text{ }\text{eV}$ extends homogeneously up to ten times the laser-focus size. The spatial distributions of the bulk-electron temperature and $K\ensuremath{\alpha}$ yield are strongly correlated.
- Published
- 2010
15. Temperature and Kalpha-yield radial distributions in laser-produced solid-density plasmas imaged with ultrahigh-resolution x-ray spectroscopy
- Author
-
U, Zastrau, P, Audebert, V, Bernshtam, E, Brambrink, T, Kämpfer, E, Kroupp, R, Loetzsch, Y, Maron, Yu, Ralchenko, H, Reinholz, G, Röpke, A, Sengebusch, E, Stambulchik, I, Uschmann, L, Weingarten, and E, Förster
- Abstract
We study warm dense matter formed by subpicosecond laser irradiation at several 10(19) W/cm(2) of thin Ti foils using x-ray spectroscopy with high spectral (E/DeltaE approximately 15,000) and one-dimensional spatial (Deltax=13.5 microm) resolutions. Ti Kalpha doublets modeled by line-shape calculations are compared with Abel-inverted single-pulse experimental spectra and provide radial distributions of the bulk-electron temperature and the absolute-photon number Kalpha yield in the target interiors. A core with approximately 40 eV extends homogeneously up to ten times the laser-focus size. The spatial distributions of the bulk-electron temperature and Kalpha yield are strongly correlated.
- Published
- 2009
16. Human endothelial cell septins: SEPT11 is an interaction partner of SEPT5
- Author
-
Barbara Zieger, Anja Busse, Sabrina Röseler, H Bauer, Michael Huber, Susanne Bläser, E Lessmann, Hansjörg Rempp, L Weingarten, Ingrid Bartsch, and Mareike Lieber
- Subjects
Two-hybrid screening ,Blotting, Western ,Cell Cycle Proteins ,GTPase ,Biology ,Septin ,Jurkat cells ,Exocytosis ,Pathology and Forensic Medicine ,Jurkat Cells ,Mice ,Two-Hybrid System Techniques ,Chlorocebus aethiops ,Fluorescence Resonance Energy Transfer ,Animals ,Chemical Precipitation ,Humans ,Drug Interactions ,Septin complex ,Cytoskeleton ,Muscle, Skeletal ,Brain Chemistry ,Myocardium ,Endothelial Cells ,beta-Galactosidase ,Recombinant Proteins ,Neoplasm Proteins ,Biochemistry ,Gene Expression Regulation ,COS Cells ,Guanosine Triphosphate ,Cytokinesis ,Septins ,Plasmids - Abstract
The septin SEPT11 is a novel member of the highly conserved septin family. Septins are cytoskeletal GTPases, which form heteropolymeric complexes. They are involved in cytokinesis and other cellular processes, such as vesicle trafficking and exocytosis. SEPT11 has strong homology to SEPT8. Previously, we identified the interaction of SEPT5 and SEPT8. Using the yeast two-hybrid system, we now demonstrate that SEPT11 partners with SEPT5. The molecular interaction of SEPT11 with SEPT5 was verified by coprecipitation of SEPT5 and SEPT11 from lysates of the human T-cell leukaemia cell line JURKAT and by fluorescence resonance energy transfer. The interaction between SEPT5 and SEPT11 requires the GTP-binding domain and the C-terminal extension. Western analysis in various mouse and human tissues revealed that expression of SEPT11 is restricted to the same tissues as those expressing SEPT5, suggesting that SEPT11 and SEPT5 are components of a cell-specific septin complex. SEPT5, which is expressed in human umbilical vein endothelial cells (HUVECs), has been reported to play an important role in exocytosis. We now report that HUVECs also express SEPT11. Given the interactivity between SEPT5 and SEPT11 as shown above and their coexpression in HUVECs, it may be that a complex formed by these two proteins is involved in the exocytosis mechanism in HUVECs. Copyright © 2006 Pathological Society of Great Britain and Ireland. Published by John Wiley & Sons, Ltd.
- Published
- 2006
17. Augmentation Myoperitoneocystoplasty
- Author
-
J L, Weingarten, W J, Cromie, and R J, Paty
- Subjects
Male ,Urology ,Urinary Bladder ,Ferrets ,Methods ,Animals - Abstract
The use of isolated intestinal segments is currently the best method of augmenting bladder capacity. The ability to perform a successful augmentation cystoplasty using nonintestinal tissue would decrease the morbidity of the operation. We studied the use of skeletal muscle-backed parietal peritoneal tissue in augmentation cystoplasty. In the experimental group animals, bladder capacity increased by 67% and urothelial regeneration was observed histologically. Problems with electrolyte abnormalities, urosepsis, or excessive mucous production were not encountered. In conclusion, a myoperitoneal flap may serve as a template for augmentation cystoplasty. Further investigation using this technique is warranted.
- Published
- 1990
18. Cryocycling of energetic materials. Final report
- Author
-
L. Weingarten, S. Griffiths, V. Revelli, R. Nilson, and J. Handrock
- Subjects
Engineering ,Life Cycle Engineering ,Waste management ,business.industry ,Hazardous waste ,Process (engineering) ,Operations management ,Reuse ,business ,Environmentally friendly ,Memorandum of understanding - Abstract
The Cryocycling of Energetic Materials Project was executed in the period FY`94-96 as a Life Cycle Engineering activity in the Memorandum of Understanding (MOU) on advanced conventional munitions. This MOU is an agreement between the Departments of Energy and Defense (Office of Munitions) that facilitates the development of technologies of mutual interest to the two Departments. The cryocycling process is a safe, environmentally friendly, and cost effective means of rubblizing bulk energetic materials so that they can be easily reused in a variety of new products. For this reason, cryocycling of excess solid energetic materials is one of the recycle/reuse strategies under study for demilitarized munitions in the Departments of Energy and Defense. These strategies seek to minimize the environmental damage associated with disposal of decommissioned energetic materials. In addition, they encourage technologies that can be used to derive economic benefit from reuse/reapplication of materials that would otherwise be treated as hazardous wastes. 45 refs., 38 figs., 7 tabs.
- Published
- 1997
19. Cryocycling of energetic materials: Status report for FY94
- Author
-
L. Whinnery, S. Griffiths, J. Handrock, V. Revelli, R. Nilson, D. Kasberg, L. Weingarten, and J. Lipkin
- Subjects
Propellant ,Ammunition ,Engineering ,Waste management ,Explosive material ,Process (engineering) ,business.industry ,Stockpile ,Mechanical engineering ,Reuse ,business ,Memorandum of understanding ,Nuclear decommissioning - Abstract
The Cryocycling of Energetic Materials Project is sponsored by the Memorandum of Understanding (MOU) on advanced munition technologies. This MOU is an agreement between the Department of Energy and the Department of Defense (Office of Munitions) that facilitates the development of technologies of mutual interest to the two Departments. The cryocycling project is one of several that focus on demilitarization aspects of conventional weapons and weapon systems. During FY94 the project pursued the development of analytical and numerical models that can be used to describe and optimize the cryocycling process for preparing energetic materials for recycle and reuse. In addition, the demilitarization stockpile of the Department of Defense was analyzed to identify candidate munitions for the process, and pilot scale cryocycling operations were begun at an industrial contractor. When a material is cryocycled, it is repeatedly subjected to cycles of rapid cooling in a liquid nitrogen bath at 77 K followed by warming to ambient temperature. In laboratory and pilot scale demonstrations, the authors have shown that cryocycling can dramatically reduce the size of a variety of propellant grains and a number of cast and plastic bonded explosives.
- Published
- 1995
20. A Determination of Military and Civilian Personnel Costs as Related to a Member of Technical Staff
- Author
-
Joseph L Weingarten
- Subjects
Engineering ,Technical support ,Factor cost ,Work (electrical) ,business.industry ,Overhead (business) ,Total cost ,Human resource management ,Cost engineering ,Technical management ,Operations management ,business - Abstract
This report provides a total cost analysis of the organic work force within the Aeronautical Systems Division's, DCS for Integrated Engineering and Technical Management. This study details all costs relative to obtain a total cost, including all overhead functions, to the government of these engineers and the relationship of that cost to Federally Funded Research and Development Center personnel. The costs are base lined to a common cost factor of the Member of Technical Staff, which is the cost of one year of technical support to an effort.
- Published
- 1992
21. Head and Neck Rehabilitation
- Author
-
Debbie L. Weingarten, Joyce E. Shappell, and Matthew L. Schwartz
- Subjects
medicine.medical_specialty ,Rehabilitation ,Oncology ,Oncology (nursing) ,business.industry ,medicine.medical_treatment ,medicine ,Physical therapy ,Physical Therapy, Sports Therapy and Rehabilitation ,Head and neck ,business - Published
- 2000
22. Progress in line-shape modeling of K-shell transitions in warm dense titanium plasmas
- Author
-
I. Uschmann, Evgeny Stambulchik, E. Förster, Yu. Ralchenko, L. Weingarten, Yitzhak Maron, A. Sengebusch, Ulf Zastrau, Eyal Kroupp, Flavio Zamponi, Heidi Reinholz, D. Fisher, Gerd Röpke, and Vladimir Bernshtam
- Subjects
Statistics and Probability ,Materials science ,Electron shell ,General Physics and Astronomy ,Statistical and Nonlinear Physics ,Plasma ,Electron ,Polarization (waves) ,Spectral line ,symbols.namesake ,Stark effect ,Modeling and Simulation ,symbols ,Electron temperature ,Atomic physics ,Mathematical Physics ,Line (formation) - Abstract
Modeling of x-ray spectra emitted from a solid-density strongly coupled plasma formed in short-duration, high-power laser–matter interactions represents a highly challenging task due to extreme conditions found in these experiments. In this paper we present recent progress in the modeling and analysis of Kα emission from solid-density laser-produced titanium plasmas. The self-consistent modeling is based on collisional-radiative calculations that comprise many different processes and effects, such as satellite formation and blending, plasma polarization, Stark broadening, solid-density quantum effects and self-absorption. A rather strong dependence of the Kα shape on the bulk electron temperature is observed. Preliminary analysis of recently obtained experimental data shows a great utility of the calculations, allowing for inferring a temperature distribution of the bulk electrons from a single-shot measurement.
- Published
- 2009
23. Effect of radiative cascades on intensities of dielectronic satellites to Heα
- Author
-
L. Weingarten, Yitzhak Maron, Vladimir Bernshtam, Leonid A. Vainshtein, Yu. Zarnitsky, and Yu. Ralchenko
- Subjects
Physics ,Range (particle radiation) ,Orders of magnitude (time) ,Radiative transfer ,Satellite ,Plasma ,Atomic physics ,Condensed Matter Physics ,Mathematical Physics ,Atomic and Molecular Physics, and Optics ,Spectral line ,Ion - Abstract
Radiative cascades into autoionizing states 1s2l2l 0 in Li-like ions are studied. The correction function that describes the effect of cascades on level populations is calculated using the 1/Z-expansion method for the range of nuclear charges Z = 10‐30. It is shown that for the q-satellite, which is often used in hot plasmas for diagnostic purposes, the contribution of radiative cascades may be three orders of magnitude larger than the direct dielectronic capture. Time-dependent collisional‐radiative modeling is used to calculate satellite intensities and determine spectra modifications due to radiative cascades.
- Published
- 2009
24. Eosinophilic cystitis in a renal allograft recipient
- Author
-
Scott A. Horner and Jeffrey L. Weingarten
- Subjects
Adult ,Graft Rejection ,Male ,Pathology ,medicine.medical_specialty ,Urology ,Urinary Bladder ,Eosinophilic cystitis ,Disease ,Pathogenesis ,Cystitis ,Eosinophilia ,medicine ,Humans ,Renal allograft recipient ,Kidney transplantation ,Urinary bladder ,business.industry ,respiratory system ,medicine.disease ,Kidney Transplantation ,surgical procedures, operative ,medicine.anatomical_structure ,Etiology ,medicine.symptom ,business - Abstract
Eosinophilic cystitis is an uncommon condition with an unknown etiology. A case of eosinophilic cystitis in a patient with chronic rejection of a cadaveric renal transplant is presented. The pathogenesis of this disease is discussed.
- Published
- 1990
25. Matrix Management
- Author
-
Joseph L. Weingarten
- Published
- 1990
26. Bilateral synchronous neonatal torsion of spermatic cord
- Author
-
F.A. Garofalo, Jeffrey L. Weingarten, and William J. Cromie
- Subjects
Male ,endocrine system ,medicine.medical_specialty ,endocrine system diseases ,urogenital system ,business.industry ,Urology ,Torsion (gastropod) ,Infant, Newborn ,urologic and male genital diseases ,Spermatic cord ,Surgery ,medicine.anatomical_structure ,Recien nacido ,medicine ,Humans ,Spermatic Cord Torsion ,business ,Orchiectomy - Abstract
A case of synchronous bilateral spermatic cord torsion in a neonate is presented. While testicular salvage is variable in this entity, surgical intervention is necessary for any hope of testicular preservation.
- Published
- 1990
27. Cecal tubularization: lengthening techniquefor creation of catheterizable conduit
- Author
-
Jeffrey L. Weingarten, James H. Barada, and William J. Cromie
- Subjects
medicine.medical_specialty ,Adolescent ,business.industry ,Urology ,medicine.medical_treatment ,Urinary diversion ,Appendix ,Urinary Diversion ,Urinary catheterization ,Surgery ,Electrical conduit ,Stoma (medicine) ,medicine ,Mitrofanoff principle ,Humans ,Female ,Urinary Bladder, Neurogenic ,Urinary Catheterization ,business ,Cecum ,Continent Urinary Diversion - Abstract
The creation of a continent, catherizable stoma is an integral component of successful continent urinary diversion. A technique is described which allows lengthening of a continent appendicovesicostomy. This technique extends the applications for the Mitrofanoff principle of urinary tract reconstruction.
- Published
- 1991
28. Empirical contributions to a theory of ambivalence
- Author
-
Abram Minkowich, Linda L. Weingarten, and Gerald S. Blum
- Subjects
Adult ,Male ,Adolescent ,media_common.quotation_subject ,Ambivalence ,Projective Techniques ,Clinical Psychology ,Psychiatry and Mental health ,Interpersonal relationship ,Attitude ,Child, Preschool ,Humans ,Personality ,Female ,Interpersonal Relations ,Projective test ,Child ,Psychology ,Social psychology ,Biological Psychiatry ,media_common - Published
- 1966
29. Evaluation of the prenatal effects of massive doses of insulin in rats
- Author
-
John R. Ream, Peter L. Weingarten, and Arthur M. Pappas
- Subjects
Blood Glucose ,Embryology ,medicine.medical_specialty ,Fetus ,business.industry ,Health, Toxicology and Mutagenesis ,medicine.medical_treatment ,Insulin ,Abnormalities, Drug-Induced ,Sodium Chloride ,Toxicology ,Hypoglycemia ,Rats ,Endocrinology ,Pregnancy ,Internal medicine ,medicine ,Animals ,Female ,Hypoglycemic shock ,business ,Saline ,Injections, Intraperitoneal ,Developmental Biology - Abstract
Pregnant rats were injected intraperitoneally with large doses of insulin. Controls were given intraperitoneal saline. Rats allowed food ad libitum maintained lowered blood-sugar levels and did not go into hypoglycemic shock; fasted rats died. Fifty-four rats produced 532 fetuses, gross and microscopic examination of which revealed no skeletal or other abnormalities. Some implications are discussed.
- Published
- 1970
30. Teratogenicity of Myleran Against Musculoskeletal Tissues in the Rat
- Author
-
Peter L. Weingarten, John R. Ream, and Arthur M. Pappas
- Subjects
Male ,Tail ,Sternum ,business.industry ,Limb Deformities, Congenital ,Abnormalities, Drug-Induced ,Physiology ,Gestational Age ,Ribs ,General Medicine ,Facial Bones ,Spine ,Rats ,Fetus ,Pregnancy ,Animals ,Pregnancy, Animal ,Medicine ,Female ,Orthopedics and Sports Medicine ,Surgery ,business ,Busulfan ,Head ,Injections, Intraperitoneal - Published
- 1971
31. The Mitrofanoff Principle: An Alternative Form of Continent Urinary Diversion
- Author
-
Jeffrey L. Weingarten and William J. Cromie
- Subjects
Adult ,Male ,Urethral Stricture ,Vesico-Ureteral Reflux ,medicine.medical_specialty ,Adolescent ,business.industry ,Urology ,medicine.medical_treatment ,Urinary Diversion ,respiratory system ,Surgery ,Urethra ,Child, Preschool ,Mitrofanoff procedure ,medicine ,Mitrofanoff principle ,Humans ,Prune Belly Syndrome ,Female ,business ,human activities ,Continent Urinary Diversion ,Ureterostomy - Abstract
The Mitrofanoff procedure for continent urinary diversion was described in 1980. This principle has been expanded upon and used to achieve continent urinary diversion in virtually any indicated clinical setting. We report 3 cases treated by the Mitrofanoff principle to illustrate the spectrum of clinical situations to which it is applicable. The Mitrofanoff principle represents a viable form of continent urinary diversion.
- Published
- 1988
32. Analysis of Phencyclidine in Blood by Gas Chromatography, Radioimmunoassay, and Enzyme Immunoassay
- Author
-
Halle L. Weingarten and Erlinda C. Trevias
- Subjects
Immunoenzyme Techniques ,Chromatography, Gas ,Chemical Health and Safety ,Chemistry ,Health, Toxicology and Mutagenesis ,Radioimmunoassay ,Analytical chemistry ,Humans ,Phencyclidine ,Environmental Chemistry ,Gas chromatography ,Toxicology ,Analytical Chemistry - Abstract
�9 .=~, : ph~ncyelldlne:~ga~'.cliromalo~ra~liy,r munoas~}~ ~! ,i~and~,enzyme ~:; m m u n oa ssay~ ~Th'e ~:resulls,:,::~,ere~cbm~'~,~'4 "~',~2' ~:-ff:~ ~ ~;-'.,,,'"~,~ ,:~-:":~ ~ '2~ ~'~: i~,~,~::~'~ ~.,~,~ , ~:, ~ ~C 'e~lLw th respect to~relalive freqUency:.of=apparent'false~ '- =~: ', :%' t~ ',,~,,2~" ~': ;~: :~ ~%~:,,~;,,;~7; ~.! ~ :',,~ .* ~,~t'~ '~ ~'~,,, ~'~ ~,:!~.~"t" ~!~ L,',r.'T,~ - '~:~ f~ ,~;; :"~ ~'T ~ ~:~"i
- Published
- 1982
33. Testicular Salvage and Age-Related Delay in the Presentation of Testicular Torsion
- Author
-
Jeffrey L. Weingarten, William J. Cromie, and James H. Barada
- Subjects
Adult ,Male ,Aging ,medicine.medical_specialty ,Time Factors ,Adolescent ,Urology ,Pain ,Risk groups ,Age related ,Testis ,Humans ,Medicine ,Testicular torsion ,In patient ,Orchiectomy ,Spermatic Cord Torsion ,business.industry ,Emergency department ,medicine.disease ,Surgery ,Presentation (obstetrics) ,Emergency Service, Hospital ,business ,Scrotal Pain - Abstract
Testicular torsion represents a continuing source of morbidity among male patients. Early diagnosis and surgical exploration improve testis salvage but even this approach will result in orchiectomy if there is excessive delay in patient presentation. A 10-year retrospective review of testicular torsion was performed. The interval between onset of scrotal pain and presentation to the emergency department was determined. A specific age-related delay in presentation was identified between patients less than 18 years old (group 1, median delay 20 hours) and those greater than 18 years old (group 2, median delay 4 hours, p less than 0.001). At exploration 44 per cent of the group 1 patients required orchiectomy versus 8 per cent in group 2. Patients less than 18 years old are a high risk group for testicular loss after torsion and represent more than 90 per cent of the orchiectomies performed. We believe that this group should be targeted for improved health education, emphasizing early evaluation of scrotal pain to improve testicular salvage.
- Published
- 1989
34. Computed tomographic changes of hypertensive encephalopathy
- Author
-
K L, Weingarten, R D, Zimmerman, R S, Pinto, and M A, Whelan
- Subjects
Adult ,Hypertension, Malignant ,Male ,Brain Diseases ,Adolescent ,Journal Article ,Humans ,Female ,Middle Aged ,Child ,Tomography, X-Ray Computed - Abstract
Computed tomographic (CT) scans were evaluated in 11 patients with acute hypertensive encephalopathy. Hypertensive encephalopathy is characterized by an acute, severe rise in blood pressure associated with headache, nausea, vomiting, altered mental status, and focal neurologic deficits, and rapid improvement after control of blood pressure. The systolic blood pressure range is 200-280 mm Hg; diastolic is 130-170 mm Hg. The most common CT finding was white-matter edema, diffuse or focal, affecting the supratentorial compartment in all cases and the infratentorial compartment in eight. These changes resolved after the blood pressure was lowered in all six patients studied by follow-up CT. Permanent areas of infarction were demonstrated in three patients. These abnormalities are correlated with the neuropathologic findings in hypertensive encephalopathy.
- Published
- 1985
35. 1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP): one designer drug and serendipity
- Author
-
H L, Weingarten
- Subjects
Adult ,Male ,Chemistry ,Chromatography, Gas ,Chemical Phenomena ,Spectrophotometry, Infrared ,1-Methyl-4-phenyl-1,2,3,6-tetrahydropyridine ,Illicit Drugs ,Pyridines ,Humans ,Parkinson Disease, Secondary ,Gas Chromatography-Mass Spectrometry - Abstract
Through an unlikely series of coincidences and fortunate accidents, the development of Parkinson's disease in several illicit drug users was traced to their use of a meperidine analog contaminated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). The discovery of a chemical capable of producing animal models of the disease has revitalized research efforts and resulted in important new information. The serendipitous finding also prompted consideration of what changes seem advisable if designer drugs are to be dealt with more efficaciously.
- Published
- 1988
36. Cargo Aircraft and Spacecraft Forward Restraint Criteria
- Author
-
Joseph L. Weingarten
- Subjects
Engineering ,Aeronautics ,Spacecraft ,business.industry ,Aviation accident ,Space Shuttle ,business ,people ,people.cause_of_death ,Original data ,Air cargo - Abstract
This investigation was primarily conducted to review probability projections of crashes of Air Force cargo aircraft as developed in 1971. The 1971 effort resulted in considerable changes to the air cargo operations. This included a lowering of restraint criteria to 3Gs with an auxiliary 9G net system. The objective of this effort was to determine if further reductions could be made through removal of the auxiliary 9G net, in addition to both aircraft and spacecraft cargo restraint criteria. Restraint and aircraft modifications were also examined. This effort viewed probabilities, based on the original data from January 1960 to July 1971, and an expanded base to July 1976 for a total of 40.4 million hours. Further, the original study viewed only major accidents; minor accidents have been added to this review. The probabilities developed in 1971 were conservative relative to actual occurrence over the past few years. Further, new probabilities were developed that show removal of the barrier net is feasible and appropriate changes are recommended to the current criteria. Commercial experience with barrier nets was also investigated and accidents where barriers were impacted are detailed.
- Published
- 1977
37. A chloroquine fatality
- Author
-
Halle L. Weingarten and Emilie J. Cherry
- Subjects
medicine.medical_specialty ,Injury control ,Adolescent ,business.industry ,Human factors and ergonomics ,Poison control ,Chloroquine ,medicine.disease ,Suicide prevention ,Occupational safety and health ,Suicide ,Emergency medicine ,Injury prevention ,medicine ,Humans ,Female ,Tissue Distribution ,Tissue distribution ,Medical emergency ,business ,medicine.drug - Published
- 1981
38. Dilemma of pancreatic ductal carcinoma
- Author
-
L, Weingarten, A M, Gelb, and M G, Fischer
- Subjects
Pancreatic Neoplasms ,Methods ,Pancreatic Ducts ,Humans ,New York City ,Neoplasm Metastasis ,Retrospective Studies - Published
- 1979
39. ChemInform Abstract: CMR DETERMINATION OF RESONANCE HYBRID WEIGHT CONTRIBUTIONS IN UNSATURATED MOLECULES, ESTIMATION OF THE 1,4-DIPOLAR CONTRIBUTION IN CONJUGATIVELY UNSATURATED KETONES
- Author
-
R. H. LEVIN and L. WEINGARTEN
- Subjects
General Medicine - Published
- 1975
40. Nonlinear stress analysis of vertical-axis wind turbine blades
- Author
-
L Weingarten and R Nickell
- Published
- 1975
41. Air Cargo Restraint Criteria
- Author
-
George E. Muller, Charles V. Mayrand, and Joseph L. Weingarten
- Subjects
Engineering ,Factor cost ,Aviation ,business.industry ,Crash ,people.cause_of_death ,Air cargo ,Transport engineering ,Aviation safety ,Aviation accident ,Airframe ,Technical report ,people ,business - Abstract
A major change in Air Force air cargo restraint criteria has been enacted. The revised criteria, which are based on technical report AFFDL-TR-71-139, Air Cargo Restraint Criteria, and their implementation are presented. An extract of AFFDL-TR-71-139 is included as Appendix I. The initial investigation was conducted to determine probabilities of encountering various forward crash load factors; to determine if cargo restraint procedures could be improved for better operational capability. Safety and cost factors were viewed in relation to current air transportability requirements. In determining the probabilities, data from January 1960 to Jul 1971, covering all major USAF cargo aircraft accidents with a total flying time in excess of 31 million hours, was used. The results showed that the risk to passengers on cargo flight is statistically rare and that a change in air cargo restraint procedures would provide a safety system than previously available with an overall cost savings to the military services.
- Published
- 1973
42. Analytical tools for maintainability and support system evaluation
- Author
-
L. Weingarten
- Subjects
Computer science ,Systems engineering ,Maintainability ,Support system ,Reliability engineering - Published
- 1964
43. Pseudoneurotic schizophrenia. Psychological test findings
- Author
-
Linda L. Weingarten and Shirley Korn
- Subjects
education.field_of_study ,medicine.medical_specialty ,Psychological Tests ,Neurotic Disorders ,Population ,Pseudoneurotic schizophrenia ,Mental illness ,medicine.disease ,Diagnosis, Differential ,Psychiatry and Mental health ,Arts and Humanities (miscellaneous) ,medicine ,Operational framework ,Schizophrenia ,Humans ,Psychological testing ,Schizophrenic Psychology ,Identification (psychology) ,medicine.symptom ,education ,Psychiatry ,Psychology ,Confusion - Abstract
THE diagnostic category pseudoneurotic schizophrenia is a relatively new psychiatric description. Perhaps for this reason alone its application seems to produce confusion and misunderstanding, if not outright rejection. Although the symptom complex is amply and even brilliantly elucidated by Hoch and his coworkers, 1 practical means of identification and differentiation remain to be delineated. Psychological test data which offer an operational framework for viewing the dynamic and defensive structure of this syndrome have not yet been exploited for their very pertinent and explicit contribution. The focus of psychiatric investigation has changed over the years as the field has expanded and provided facilities for treating a broader segment of the population. Formerly mental illness was considered a condition of relatively chronic incapacitation and deterioration. In recent years the emphasis has shifted to a recognition of pathological but stabilized individuals who suffer either periodic breakdown or manifest circumscribed areas of dysfunction. One
- Published
- 1967
44. 1-Methyl-4-Phenyl-1,2,3,6-Tetrahydropyridine (MPTP): One Designer Drug and Serendipity
- Author
-
Halle L. Weingarten
- Subjects
Meperidine analog ,Engineering ,Injury control ,Serendipity ,medicine.drug_class ,business.industry ,MPTP ,Poison control ,Pharmacology ,Pathology and Forensic Medicine ,Designer drug ,chemistry.chemical_compound ,chemistry ,Genetics ,medicine ,Illicit drug ,1 methyl 4 phenyl 1 ,business ,Neuroscience - Abstract
Through an unlikely series of coincidences and fortunate accidents, the development of Parkinson's disease in several illicit drug users was traced to their use of a meperidine analog contaminated with 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP). The discovery of a chemical capable of producing animal models of the disease has revitalized research efforts and resulted in important new information. The serendipitous finding also prompted consideration of what changes seem advisable if designer drugs are to be dealt with more efficaciously.
- Published
- 1988
45. Re: The Continent Ileal Bladder for Urinary Tract Reconstruction After Cystectomy: A Survey of 44 Patients, by H. Melchior, C. Spehr, I. Knop-Wagemann, M. C. Persson and K. P. Juenemann, J. Urol., 139: 714–718, 1988
- Author
-
William J. Cromie and Jeffrey L. Weingarten
- Subjects
Ileal bladder ,Cystectomy ,medicine.medical_specialty ,business.industry ,Urology ,medicine.medical_treatment ,Urinary system ,medicine ,business - Published
- 1989
46. Progress in line-shape modeling of K-shell transitions in warm dense titanium plasmas.
- Author
-
E Stambulchik, V Bernshtam, L Weingarten, E Kroupp, D Fisher, Y Maron, U Zastrau, I Uschmann, F Zamponi, E Forster, A Sengebusch, H Reinholz, G Ropke, and Yu Ralchenko
- Subjects
MATHEMATICAL models ,PHASE transitions ,STRONGLY coupled plasmas ,TITANIUM compounds ,POLARIZATION (Nuclear physics) ,QUANTUM theory ,MATHEMATICAL physics - Abstract
Modeling of x-ray spectra emitted from a solid-density strongly coupled plasma formed in short-duration, high-power laser-matter interactions represents a highly challenging task due to extreme conditions found in these experiments. In this paper we present recent progress in the modeling and analysis of Ka emission from solid-density laser-produced titanium plasmas. The self-consistent modeling is based on collisional-radiative calculations that comprise many different processes and effects, such as satellite formation and blending, plasma polarization, Stark broadening, solid-density quantum effects and self-absorption. A rather strong dependence of the Ka shape on the bulk electron temperature is observed. Preliminary analysis of recently obtained experimental data shows a great utility of the calculations, allowing for inferring a temperature distribution of the bulk electrons from a single-shot measurement. [ABSTRACT FROM AUTHOR]
- Published
- 2009
- Full Text
- View/download PDF
47. Easy reversible clustering of gold nanoparticles via pH-Induced assembly of PVP-b-PAA copolymer.
- Author
-
Yon M, Lonetti B, Gineste S, Perez J, Goudouneche D, Weingarten L, Marty JD, and Ciuculescu-Pradines D
- Abstract
The growing demand of novel hybrid organic/inorganic systems with exciting properties has contributed to an increasing need for simplifying production strategies. Here, we report a simple method to obtain controlled three-dimensional hybrid architectures, in particular hybrid supracolloids (hSC), formed by gold nanoparticles and a double hydrophilic block copolymer, specifically the poly(acrylic acid)-block-poly(N-vinyl-2-pyrrolidone) (PAA-b-PVP), directly in aqueous medium. The ubiquitous pH-sensitive poly(acrylic acid) (PAA) block initiates the assembly through pH changes, while the poly(N-vinyl-2-pyrrolidone) block assures the close affinity with the AuNPs. We demonstrate that the formation of hybrid supracolloids (hSC) is the result of the synergetic behavior of the two specific polymeric blocks. Additionally, the entire process shows spontaneous and fast switchability. The nanostructured copolymer behaves like a highly swollen hydrogel and displays a disordered internal structure. The driving force for the association of the copolymer chains is induced by the synergetic effects of the decrease in solubility of the poly(acrylic acid) block and the formation of inter and intra chains hydrogen bonds. These were demonstrated by using small angle X-ray scattering (SAXS), quartz crystal microbalance with dissipation monitoring (QCM-D) and scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy (STEM-EDX). In turn, the AuNPs are randomly spread all over the polymeric matrix, as demonstrated by field emission gun - scanning electron microscopy (FEG-SEM). A correlation analysis reveals the hSC density depends mostly on the initial concentration of AuNPs. These results can inspire the fabrication of more complex structures with multicomponent composition., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2024 The Author(s). Published by Elsevier Inc. All rights reserved.)
- Published
- 2025
- Full Text
- View/download PDF
48. A national survey of children's experiences and needs when attending Canadian pediatric emergency departments.
- Author
-
Ma K, Rahimi A, Rajagopal M, Yaskina M, Goldman RD, Jones A, Erickson T, Poonai N, McGahern C, Weingarten L, Lerman B, Auclair MC, Wong H, Hartling L, Schreiner K, Scott S, and Ali S
- Subjects
- Humans, Child, Female, Male, Adolescent, Canada, Cross-Sectional Studies, Surveys and Questionnaires, Patient Satisfaction statistics & numerical data, Emergency Service, Hospital statistics & numerical data
- Abstract
Background: Optimizing a child's emergency department (ED) experience positively impacts their memories and future healthcare interactions. Our objectives were to describe children's perspectives of their needs and experiences during their ED visit and relate this to their understanding of their condition., Methods: 514 children, aged 7-17 years, and their caregivers presenting to 10 Canadian pediatric EDs completed a descriptive cross-sectional survey from 2018-2020., Results: Median child age was 12.0 years (IQR 9.0-14.0); 56.5% (290/513) were female. 78.8% (398/505) reported adequate privacy during healthcare conversations and 78.3% (395/504) during examination. 69.5% (348/501) understood their diagnosis, 89.4% (355/397) the rationale for performed tests, and 67.2% (338/503) their treatment plan. Children felt well taken care of by nurses (90.9%, 457/503) and doctors (90.8%, 444/489). Overall, 94.8% (475/501) of children were happy with their ED visit. Predictors of a child better understanding their diagnosis included doctors talking directly to them (OR 2.21 [1.15, 4.28]), having someone answer questions and worries (OR 2.51 [1.26, 5.01]), and older age (OR 1.08 [1.01, 1.16]). Direct communication with a doctor (OR 2.08 [1.09, 3.99]) was associated with children better understanding their treatment, while greater fear/ 'being scared' at baseline (OR 0.59 [0.39, 0.89]) or at discharge (OR 0.46 [0.22, 0.96]) had the opposite effect., Interpretation: While almost all children felt well taken care of and were happy with their visit, close to 1/3 did not understand their diagnosis or its management. Children's reported satisfaction in the ED should not be equated with understanding of their medical condition. Further, caution should be employed in using caregiver satisfaction as a proxy for children's satisfaction with their ED visit, as caregiver satisfaction is highly linked to having their own needs being met., Competing Interests: The authors have declared that no competing interests exist., (Copyright: © 2024 Ma et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.)
- Published
- 2024
- Full Text
- View/download PDF
49. Lasting Impact of the COVID-19 Pandemic on Care and Prevention of Sexually Transmitted Infections in the Midwest.
- Author
-
Patel M, Cardoza N, Weingarten L, Kolenchery N, Trolard A, Cooper B, and Reno H
- Subjects
- Humans, Pandemics, COVID-19 epidemiology, Sexually Transmitted Diseases epidemiology, HIV Infections epidemiology
- Abstract
Background: The COVID-19 pandemic reduced the general accessibility of health services. Many sexually transmitted infection (STI) testing and treatment sites modified services (e.g., reduced hours, limited walk-in availability, decreased testing capacity), changes that may result in permanent change in STI service availability. At the same time, systems were driven to innovate in ways that could benefit patients. This study aimed to describe how the COVID-19 pandemic changed STI clinical services, with a focus on long-term impacts., Methods: In July 2022, a phone survey was designed to assess services for STIs at the 105 STI testing and treatment providers in the St. Louis metropolitan statistical area. Sexually transmitted infection testing providers included STI clinics, primary care clinics that cater to a broad population, and community-based organizations, and excluded emergency departments and urgent care centers. In most cases, the survey was completed by a clinic manager, medical director, or nursing staff member., Results: Of the 75 locations that were interviewed, 12 (16%) had not returned to prepandemic capacity and operations as of July 2022. Five sites had closed completely since the pandemic began, 3 of which are in the northwestern region of the metropolitan statistical area. Most (58.6%) of the open clinics had added telehealth appointments., Conclusions: Sexually transmitted infection testing sites decreased during the pandemic with lasting impact in one area of the Midwest. Resources to support STI infrastructure should be expanded. Maintaining updated information on STI care providers in the region can aid future assessments., Competing Interests: Conflict of Interest and Sources of Funding: Dr. Reno is site principal investigator for a grant from Hologic, Inc, to Washington University. For the remaining authors, no conflicts were declared., (Copyright © 2024 American Sexually Transmitted Diseases Association. All rights reserved.)
- Published
- 2024
- Full Text
- View/download PDF
50. The food additive titanium dioxide hinders intestinal production of TGF-β and IL-10 in mice, and long-term exposure in adults or from perinatal life blocks oral tolerance to ovalbumin.
- Author
-
Lamas B, Chevalier L, Gaultier E, Cartier C, Weingarten L, Blanc X, Fisicaro P, Oster C, Noireaux J, Evariste L, Breyner NM, and Houdeau E
- Subjects
- Pregnancy, Female, Mice, Animals, Ovalbumin, Food Additives, Titanium, Interleukin-10, Transforming Growth Factor beta metabolism
- Abstract
Food hypersensitivities are increasing in industrialized countries, and foodborne nanoparticles (NPs) are suspected as co-factors in their aetiology. Food-grade titanium dioxide (fg-TiO
2 ), a food colouring agent, is composed of NPs with immunomodulatory properties. We investigated whether fg-TiO2 may compromise the establishment of oral tolerance (OT) to food proteins using a model of OT induction to ovalbumin (OVA) in mice, and whether a perinatal exposure could trigger this effect. In pregnant mice fed a TiO2 -enriched diet, ICP-MS and TEM-EDX analyses showed passage of TiO2 NPs into the foetus. When their weaned offspring were fed the same diet, a breakdown in OT to OVA was observed at adulthood, characterized by a high anti-OVA IgG production compared to controls. However, adult mice directly exposed to fg-TiO2 did not induce OT to OVA either, ruling out a developmental origin for these effects. When these mice were orally challenged with OVA, intestinal inflammation demonstrated hypersensitivity to OVA. In OVA-naïve mice, fg-TiO2 exposure impaired intestinal TGF-β and IL-10 production, of key role in OT induction and maintenance. These findings showed that long-term exposure to TiO2 as food additive alters anti-inflammatory cytokine profile, and leads to OT failure regardless of the timing of TiO2 exposure throughout life., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2023. Published by Elsevier Ltd.)- Published
- 2023
- Full Text
- View/download PDF
Catalog
Discovery Service for Jio Institute Digital Library
For full access to our library's resources, please sign in.