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Ultrafast optical probing is a widely used method of underdense plasma diagnostic. In relativistic plasma, the motion blur limits spatial resolution in the direction of motion. For many high-power lasers the initial pulse duration of 30–50 fs results in a 10–15 μm motion blur, which can be reduced by probe pulse post-compression. Here we used the compression after compressor approach [Phys.-Usp. 62, 1096 (2019); JINST 17 P07035 (2022)], where spectral broadening is performed in thin optical plates and is followed by reflections from negative-dispersion mirrors. Our initially low-intensity probe beam was down-collimated for a more efficient spectral broadening and higher probe-to-self-emission intensity ratio. The setup is compact, fits in a vacuum chamber and can be implemented within a short experimental time slot. We proved that the compressed pulse retained the high quality necessary for plasma probing.
Compacted MX-80 bentonite is a potential backfill material in radioactive-waste repositories. Pore space in MX-80 has been the subject of considerable debate. 3D reconstructions of the pore space based on tomographic methods could provide new insights into the nature of the pore space of compacted bentonites. To date, few such reconstructions have been done because of problems with the preparation of bentonite samples for electron microscopy. The nanoscale intergranular pore space was investigated here by cryo-Focused Ion Beam nanotomography (FIB-nt) applied to previously high-pressure frozen MX-80 bentonite samples. This approach allowed a tomographic investigation of the in situ microstructure related to different dry densities (1.24, 1.46, and 1.67 g/cm3). The FIB-nt technique is able to resolve intergranular pores with radii >10 nm. With increasing dry density (1.24–1.67 g/cm3) the intergranular porosity (>10 nm) decreased from ~5 vol.% to 0.1 vol.%. At dry densities of 1.24 and 1.46 g/cm3, intergranular pores were filled with clay aggregates, which formed a mesh-like structure, similar to the honeycomb structure observed in diagenetic smectite. Unlike ‘typical’ clay gels, the cores of the honeycomb structure were not filled with pure water, but instead were filled with a less dense material which presumably consists of very fine clay similar to a colloid. In the low-density sample this honeycomb-structured material partly filled the intergranular pore space but some open pores were also present. In the 1.46 g/cm3 sample, the material filled the intergranular pores almost completely. At the highest densities investigated (1.67 g/cm3), the honeycomb-structured material was not present, probably because of the lack of intergranular pores which suppressed the formation of the honeycomb framework or skeleton consisting of clay aggregates.
Most students in MD-PhD programs take a leave of absence from medical school to complete PhD training, which promotes a natural loss of clinical skills and knowledge and could negatively impact a student’s long-term clinical knowledge. To address this concern, clinical refresher courses in the final year of PhD training have traditionally been used; however, effectiveness of such courses versus a longitudinal clinical course spanning all PhD training years is unclear.
Methods:
The University of Alabama at Birmingham MD-PhD Program implemented a comprehensive continuing clinical education (CCE) course spanning PhD training years that features three course components: (1) clinical skills; (2) clinical knowledge; and (3) specialty exposure activities. To evaluate course effectiveness, data from an anonymous student survey completed at the end of each semester were analyzed.
Results:
Five hundred and ninety-seven surveys were completed by MD-PhD students from fall 2014 to 2022. Survey responses indicated that the majority of students found the course helpful to: maintain clinical skills and knowledge (544/597, 91% and 559/597, 94%; respectively), gain exposure to clinical specialties (568/597, 95%), and prepare them for responsibilities during clinical clerkships. During semesters following lockdowns from the COVID-19 pandemic, there were significant drops in students’ perceived preparedness.
Conclusions:
Positive student survey feedback and improved preparedness to return to clinic after development of the course suggests the CCE course is a useful approach to maintain clinical knowledge during research training.
To investigate clinically relevant microbiological characteristics of uropathogens and to compare patients with catheter-associated urinary tract infections (CAUTIs) to those with non-CAUTIs.
Methods:
All urine cultures from the calendar year 2019 of the Swiss Centre for Antibiotic Resistance database were analyzed. Group differences in the proportions of bacterial species and antibiotic-resistant isolates from CAUTI and non-CAUTI samples were investigated.
Results:
Data from 27,158 urine cultures met the inclusion criteria. Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeruginosa, and Proteus mirabilis together represented 70% and 85% of pathogens identified in CAUTI and non-CAUTI samples, respectively. Pseudomonas aeruginosa was significantly more often detected in CAUTI samples. The overall resistance rate for the empirically often-prescribed antibiotics ciprofloxacin (CIP), norfloxacin (NOR), and trimethoprim-sulfamethoxazole (TMP-SMX) was between 13% and 31%. Except for nitrofurantoin, E. coli from CAUTI samples were more often resistant (P ≤ .048) to all classes of antibiotics analyzed, including third-generation cephalosporines used as surrogate for extended-spectrum β-lactamase (ESBL). Significanty higher resistance proportions in CAUTI samples versus non-CAUTI samples were observed for CIP (P = .001) and NOR (P = .033) in K. pneumoniae, for NOR (P = .011) in P. mirabilis, and for cefepime (P = .015), and piperacillin-tazobactam (P = .043) in P. aeruginosa.
Conclusion:
CAUTI pathogens were more often resistant to recommended empirical antibiotics than non-CAUTI pathogens. This finding emphasizes the need for urine sampling for culturing before initiating therapy for CAUTI and the importance of considering therapeutic alternatives.
The present study provides new insight into suitable microsporidian–host associations. It relates regional and continental-wide host specialization in microsporidians infecting amphipods to degraded and recovering habitats across 2 German river catchments. It provides a unique opportunity to infer the persistence of parasites following anthropogenic disturbance and their establishment in restored rivers. Amphipods were collected in 31 sampling sites with differing degradation and restoration gradients. Specimens were morphologically (hosts) and molecularly identified (host and parasites). Amphipod diversity and abundance, microsporidian diversity, host phylogenetic specificity and continental-wide β-specificity were investigated and related to each other and/or environmental variables. Fourteen microsporidian molecular operational taxonomic units (MOTUs), mainly generalist parasites, infecting 6 amphipod MOTUs were detected, expanding the current knowledge on the host range by 17 interactions. There was no difference in microsporidian diversity and host specificity among restored and near-natural streams (Boye) or between those located in urban and rural areas (Kinzig). Similarly, microsporidian diversity was generally not influenced by water parameters. In the Boye catchment, host densities did not influence microsporidian MOTU richness across restored and near-natural sites. High host turnover across the geographical range suggests that neither environmental conditions nor host diversity plays a significant role in the establishment into restored areas. Host diversity and environmental parameters do not indicate the persistence and dispersal of phylogenetic host generalist microsporidians in environments that experienced anthropogenic disturbance. Instead, these might depend on more complex mechanisms such as the production of resistant spores, host switching and host dispersal acting individually or conjointly.
Physician-scientists have long been in high demand owing to their role as key drivers of biomedical innovation, but their dwindling prevalence in research and medical communities threatens ongoing progress. As the principal avenue for physician-scientist development, combined MD–PhD training programs and NIH-funded Medical Scientist Training Programs (MSTPs) must address all aspects of career development, including grant writing skills.
Methods:
The NIH F-series grants – the F30 grant in particular – model the NIH format of federal funding, and are thus ideal opportunities to acquire biomedical research grant preparation experience. Therefore, in this report, we describe a curricular model through which predoctoral MSTP students obtain exposure to – and training for – F-series grant conceptualization, writing, and evaluation.
Results:
Since the development of these longitudinal courses, we observed trending improvements in student funding success rates, particularly among original submissions, and perceived benefits among participating students.
Acute epistaxis can be a life-threatening airway emergency, requiring in-patient admission. The coronavirus disease 2019 pandemic placed significant strain on hospital resources, and management has shifted towards an out-patient-centred approach.
Methods
A five-month single-centre retrospective study was undertaken of all epistaxis patients managed by the ENT department. A pre-coronavirus disease 2019 pandemic group was managed with pre-existing guidelines, compared to new guidelines for the coronavirus disease 2019 pandemic group. A telephone survey was performed on out-patients with non-dissolvable packs to assess patient comfort and satisfaction.
Results
A total of 142 patients were seen. The coronavirus disease 2019 pandemic group had significantly more patients aged over 65 years (p = 0.004), an increased use of absorbable dressings and local haemostatic agents (Nasopore and Surgiflo), and fewer admissions (all p < 0.0005). Rates of re-presentation and morbidity, and length of hospital stay were similar. The telephone survey revealed out-patient management to be efficacious and feasible.
Conclusion
The coronavirus disease 2019 pandemic has shifted epistaxis management towards local haemostatic agents and out-patient management; this approach is as safe and effective as previously well-established regimens.
For decades, critics of pluralism have argued that the American interest group system exhibits a significantly biased distribution of policy preferences. We evaluate this argument by measuring groups’ revealed preferences directly, developing a set of ideal point estimates, IGscores, for over 2,600 interest groups and 950 members of Congress on a common scale. We generate the scores by jointly scaling a large dataset of interest groups’ positions on congressional bills with roll-call votes on those same bills. Analyses of the scores uncover significant heterogeneity in the interest group system, with little conservative skew and notable inter-party differences in preference correspondence between legislators and ideologically similar groups. Conservative bias and homogeneity reappear, however, when weighting IGscores by groups’ PAC contributions and lobbying expenditures. These findings suggest that bias among interest groups depends on the extent to which activities like PAC contributions and lobbying influence policymakers’ perceptions about the preferences of organized interests.
Biomagnetic field sensors based on AlN/FeCoSiB magnetoelectric (ME) composites desire a resonant frequency that can be precisely tuned to match the biomagnetic signal of interest. A tunable mechanical resonant frequency is achieved when ME composites are integrated onto shape memory alloy (SMA) thin films. Here, high-quality c-axis growth of AlN is obtained on (111) Pt seed layers on both amorphous and crystallized TiNiCu SMA thin films on Si substrates. These composites show large piezoelectric coefficients as high as d33,f= 6.4 pm/V ± 0.2 pm/V. Annealing the AlN/Pt/Ta/amorphous TiNiCu/Si composites to 700 °C to crystallize TiNiCu promoted interdiffusion of Ti into the Ta/Pt layers, leading to an enhanced conductivity in AlN. Depositing AlN onto already crystalline TiNiCu films with low surface roughness resulted in the best piezoelectric films and hence is found to be a more desirable processing route for ME composite applications.
Fatigue and depression are among the most frequent symptoms in multiple sclerosis (MS), affecting up to 90% of patients at onset or during the course of the disease. Repetitive transcranial magnetic stimulation (rTMS) has proven safe and efficacious for treating depression.
Objective
To perform a randomized, sham-controlled pilot study to evaluate effects of deep rTMS on fatigue and depression in patients with multiple sclerosis.
Methods
28 MS-patients underwent 18 sessions of deep rTMS over 6 weeks. 10 patients underwent sham stimulation, 9 patients stimulation of the left prefrontal cortex (PFC) (18 Hz, 120% motor threshold (MT)) and 9 patients of the motor cortex (MC) (5 Hz, 90% MT). Following the treatment, patients were observed for further 6 weeks. Effects on fatigue were evaluated with the Fatigue Severity Scale (FSS) Depression was assessed by Becks Depression Inventory (BDI).
Results
There was no significant change of BDI or FSS in sham group, as well as in PFC group over all time points. However BDI in MC group showed a significant decrease already in early treatment phase (-25.74% ± 24.36%, p = 0.013) and continued decrease over treatment period with maximum in follow up phase (-39.23% ± 21.57, p = 0.001). In FSS, MC group showed a trend to decrease during treatment period and the effect becomes significant in follow up phase (-26,72% ± 16.30%, p = 0.001).
Conclusion
Our data suggests that deep rTMS may have positive influence on depression and fatigue. Intrestingly, comparable effects on both symptoms were observed in MC group but not in PFC or in sham group.
What was the Cold War that shook world politics for the second half of the twentieth century? Standard narratives focus on Soviet-American rivalry as if the superpowers were the exclusive driving forces of the international system. Lorenz M. Lüthi offers a radically different account, restoring agency to regional powers in Asia, the Middle East and Europe and revealing how regional and national developments shaped the course of the global Cold War. Despite their elevated position in 1945, the United States, Soviet Union and United Kingdom quickly realized that their political, economic, and military power had surprisingly tight limits given the challenges of decolonization, Asian-African internationalism, pan-Arabism, pan-Islamism, Arab–Israeli antagonism, and European economic developments. A series of Cold Wars ebbed and flowed as the three world regions underwent structural changes that weakened or even severed their links to the global ideological clash, leaving the superpower Cold War as the only major conflict that remained by the 1980s.
The socialist economic system in Eastern Europe—the Council for Mutual Economic Assistance—was established in 1949. Most of the countries there did not join the CMEA because they genuinely believed in its purpose of rivaling the capitalist half of Europe. Stalin forced in order to protect Soviet influence there. Yet even he seemed not to be convinced about the viability of the CMEA. Several socialist states opted out of the idea of an integrated socialist economic system within two decades—Yugoslavia, China, Albania, and Romania. Because the USSR was the dominant member, it initiated several rounds of reforms from the mid 1950s to the 1970s to provide the CMEA with greater purpose and direction in the competition with the capitalist West. But the structural and ideological foundations, which Stalin had put in place before 1953, remained remarkably resistant to change. Thus, within two decades of the end of Worl War II, Soviet-controlled Eastern Europe turned from a source of reparations into an economic liability for the USSR. By the late 1970s, virtually all CMEA members understood that the organization had failed to deliver it had set out to do.
The previous fifteen chapters have explored the structural changes that Asia, the Middle East, and Europe had undergone during the decades leading up to the late 1970s. In Asia, reunified Vietnam replaced the rising China as a revolutionary power, while India transformed its internationalism into a national quest for great power status. In the Middle East, the Arab–Israeli conflict went through four major wars. Israel emerged as an unacknowledged regional power, Egypt ensnared the global Cold War in the region but realized the futility of allying closely with the Soviet Union, and the Palestinians managed to put their struggle for nationhood on the international agenda despite repeated military and political defeats. Asian–African Internationalism, Non-Alignment, and pan-Islamism all formulated alternatives to the Cold War bloc system.
As in Asia, decolonization in the Middle East intersected with the long-term effects of European imperialism and the influence of the global Cold War. Resembling Vietnam and India, many Arab states did not emerge from pre-colonial antecedents, but were mainly French and British creations (Chapter 2). Like China in Asia (Chapter 5), Egypt was the rare exception in the Middle East. Nation state formation in the region occurred relatively late as a result of previous European interventions. And similar to South Asia (Chapter 7), the Middle East experienced partition imposed from the outside.
The idea of the Free World emerged in World War II from the struggle of Western liberal democracies against their autocratic and totalitarian enemies. After the war, the Free World consisted of the United States, a group of Western European liberal democracies that re-emerged after liberation from Germany and sought American protection, and the reconstructed and mostly demilitarized war enemies Italy, (West) Germany, and Japan. The US-led anti-communist alliance building in the wake of the Korean War increasingly included Asian and the Middle Eastern countries in the defense of the Free World, although they often were authoritarian . The liberal-democratic nature of the Free World’s core in Europe allowed open political disagreements to emerge, mostly between Charles de Gaulle’s France and the Anglo-American powers but also within the societies of the Free World itself. These conflicts reached their combined peak in 1968 over the Vietnam War and widespread popular protests in several Western countries. The Soviet intervention in Czechoslovakia and subsequent changes of government in the West, however, helped to recreate a semblance of unity within the Free World by the early 1970s.