Publications by authors named "Beek J"

Despite recent advances in our understanding of the structure and function of conjugative Type 4 Secretion Systems (T4SSs), there is still only very scarce data available for the ones from Gram-positive (G) bacteria. This is a problem, as conjugative T4SSs are main drivers for the spread of antibiotic resistance genes and virulence factors. Here, we aim to increase our understanding of G systems, by using bioinformatic approaches to identify proteins that are conserved in all conjugative T4SS machineries and reviewing the current knowledge available for these components.

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Background: Upper limb dysfunction is a common debilitating feature of relapsing-remitting multiple sclerosis (RRMS). We aimed to examine the longitudinal trajectory of the iPad®-based Manual Dexterity Test (MDT) and predictors of change over time.

Methods: We prospectively enrolled RRMS patients (limited to Expanded Disability Status Scale (EDSS) < 4).

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Background: Heart failure (HF) is strongly associated with inflammation. In pressure overload (PO)-induced HF, cardiac stress triggers adaptive immunity, ablation or inhibition of which blocks disease progression. We hypothesized that PO-HF might fulfill the often-used criteria of autoimmunity: if so, the associated adaptive immune response would be not only necessary but also sufficient to induce HF; it should also be possible to identify self-antigens driving the autoimmune response.

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Background: To date, it is still not clear why during the COVID-19 pandemic children generally developed no or milder symptoms compared to adults. As innate immune responses are crucial in the early defense against pathogens, we aimed at profiling these responses from both adults and children with a primary SARS-CoV-2 infection.

Methods: In the first months of the pandemic, PBMCs and serum were collected from peripheral blood of adults and children at different time points after testing SARS-CoV-2 PCR positive (PCR+).

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Background: A digital adaptation of the nine-hole peg test (9HPT) was developed with the potential to provide novel disability features for patients with multiple sclerosis (PwMS).

Objectives: The objectives were to evaluate the 9HPT features based on reliability, prognosis, and discrimination between treatment groups.

Methods: The MS partners Advancing Technology and Health Solutions (MS PATHS) cohort data were used to derive new features including completion time and speed.

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Background: Given their often-vulnerable circumstances, young fathers' childcare involvement is precarious. Despite the potential benefits of receiving professional support, young fathers experience exclusion or suboptimal support in maternity care. Insights into maternity care providers' attitudes toward young fathers and their perspectives on the support they provide to this group are, however, lacking.

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Background: Smartphones and wearables are revolutionizing the assessment of cognitive and motor function in neurological disorders, allowing for objective, frequent, and remote data collection. However, these assessments typically provide a plethora of sensor-derived measures (SDMs), and selecting the most suitable measure for a given context of use is a challenging, often overlooked problem.

Objective: This analysis aims to develop and apply an SDM selection framework, including automated data quality checks and the evaluation of statistical properties, to identify robust SDMs that describe the cognitive and motor function of people with multiple sclerosis (MS).

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Renal cell carcinoma (RCC) is a very rare type of renal cancer in children and young adults. When metastasized or recurrent, no standards of care are available, and outcome is still poor. The tyrosine kinase inhibitor axitinib is approved for treatment of RCC in adults, but its effects in children and young adults with RCC remains unclear.

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  • Mosquitoes are key vectors for diseases and are changing their geographical distribution due to global environmental changes, increasing the need for accurate predictions of their distribution patterns.
  • Ecological niche modelling (ENM) using high-resolution local environmental variables reveals that variations in mosquito distributions are influenced by local conditions rather than just macroclimatic factors.
  • The study on Bonaire highlights that urban environments attract introduced mosquito species, while native species prefer specific habitats like mangroves and forests, emphasizing the need for localized strategies in mosquito management to combat disease risks.
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Chlorophyll fluorescence is a well-established method to estimate chlorophyll content in leaves. A popular fluorescence-based meter, the Opti-Sciences CCM-300 Chlorophyll Content Meter (CCM-300), utilizes the fluorescence ratio F735/F700 and equations derived from experiments using broadleaf species to provide a direct, rapid estimate of chlorophyll content used for many applications. We sought to quantify the performance of the CCM-300 relative to more intensive methods, both across plant functional types and years of use.

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Objectives: The International Society of Paediatric Oncology-Renal Tumour Study Group (SIOP-RTSG) discourages invasive procedures to determine the histology of paediatric renal neoplasms at diagnosis. Therefore, the histological subtype of Wilms' tumours (WT) is unknown at the start of neoadjuvant chemotherapy. MR-DWI shows potential value as a non-invasive biomarker through apparent diffusion coefficients (ADCs).

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Introduction: Introduction: Renal cell carcinoma (RCC) is a very rare pediatric renal tumor. Robust evidence to guide treatment is lacking and knowledge on targeted therapies and immunotherapy is mainly based on adult studies. Currently, the International Society of Pediatric Oncology-Renal Tumor Study Group (SIOP-RTSG) 2016 UMBRELLA protocol recommends sunitinib for metastatic or unresectable RCC.

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Enteroviruses are a vast genus of positive-sense RNA viruses that cause diseases ranging from common cold to poliomyelitis and viral myocarditis. They encode a membrane-bound AAA+ ATPase, 2C, that has been suggested to serve several roles in virus replication, e.g.

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  • Vaccine responsiveness tends to decrease in older adults, complicating efforts to create effective vaccination strategies for infectious diseases in this age group.
  • In the VITAL clinical trials, participants of different age groups were given various vaccines, revealing that older adults had lower antibody responses to the primary vaccines compared to younger adults.
  • The study also found that about 10% of participants, particularly older males, showed consistently low responses to multiple vaccines, highlighting the need for targeted vaccination strategies for at-risk groups.
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  • The study investigates differences in antibody responses to SARS-CoV-2 between children and adults, focusing on various Fc-mediated functions like phagocytosis and natural killer cell activation over a 10-month period.
  • Results indicate that children exhibit similar, but potentially more durable, antibody responses, particularly in complement deposition, compared to adults, while natural killer cell activation was notably reduced in both groups.
  • Understanding these differences is important for developing tailored vaccination strategies against respiratory viruses, highlighting the need for age-specific insights in vaccine design.
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Conjugative type 4 secretion systems (T4SSs) are the main driver for the spread of antibiotic resistance genes and virulence factors in bacteria. To deliver the DNA substrate to recipient cells, it must cross the cell envelopes of both donor and recipient bacteria. In the T4SS from the enterococcal conjugative plasmid pCF10, PrgK is known to be the active cell wall degrading enzyme.

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  • Young children and older adults are particularly vulnerable to invasive pneumococcal disease (IPD) due to lower levels of protective antibodies against Streptococcus pneumoniae.
  • Research measured IgG and IgA antibodies in serum and saliva across different age groups, revealing that younger children have significantly lower antibody levels and avidity compared to adults.
  • The findings suggest that repeated exposure to pneumococci through factors like daycare attendance boosts antibody levels, with young children’s low antibody profiles contributing to their susceptibility to IPD and older adults experiencing different influencing factors.
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People with HIV continue to experience HIV stigma. Quantitative data on HIV stigma perpetrated by healthcare providers of hospitals providing HIV care in high-income countries are limited. The aim of this study is to investigate factors associated with HIV stigma in Dutch healthcare settings from the healthcare providers' perspective.

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Background: Video-urodynamic studies (VUDS) are the recommended standard of diagnostic care to objectively assess neurogenic lower urinary tract dysfunction (NLUTD) in individuals with spinal cord injury/disease (SCI/D). This examination requires the insertion of a catheter into the bladder, which increases the risk of a urinary tract infection (UTI). Data on symptomatic UTIs after VUDS are limited.

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Introduction: Accumulating evidence indicates the importance of T cell immunity in vaccination-induced protection against severe COVID-19 disease, especially against SARS-CoV-2 Variants-of-Concern (VOCs) that more readily escape from recognition by neutralizing antibodies. However, there is limited knowledge on the T cell responses across different age groups and the impact of CMV status after primary and booster vaccination with different vaccine combinations. Moreover, it remains unclear whether age has an effect on the ability of T cells to cross-react against VOCs.

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Background: Greenness exposure has been associated with many health benefits, for example through the pathway of providing opportunities for physical activity (PA). Beside the limited body of longitudinal research, most studies overlook to what extent different types of greenness exposures may be associated with varying levels of PA and sedentary behavior (SB). In this study, we investigated associations of greenness characterized by density, diversity and vegetation type with self-reported PA and SB over a 9-year period, using data from the ORISCAV-LUX study (2007-2017, n = 628).

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  • The cheese making and vegetable processing industries produce a lot of high-nitrogen wastewater, often treated in rural areas through land applications, which impacts denitrification rates in different soil types.* -
  • Research showed that denitrification decreased with lower temperatures in industry facility soils but remained high in agricultural soils, emphasizing the relationship between temperature and groundwater contamination risks.* -
  • The dominant soil microbiome across all systems included Actinobacteria, Proteobacteria, and Acidobacteria, with Nitrosphaeria being the leading class, but no clear correlations were found between denitrification rates and the biotic or abiotic factors in the systems studied.*
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Respiratory pathogens can cause severe disease and even death, especially in the very young and very old. Studies investigating their prevalence often focus on individuals presenting to healthcare providers with symptoms. However, the design of prevention strategies, e.

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  • Streptococcus pneumoniae is a bacteria that can make kids and older people very sick.
  • Scientists checked the levels of special antibodies (IgG) in different age groups to see how the body fights this bacteria.
  • They found that babies have low antibody levels, which grow in adults but decrease as people get older, showing how our immune defenses change throughout life.
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  • Congenital mesoblastic nephroma is the most common solid kidney tumor in newborns, and MRI is the preferred method for diagnosis, especially in differentiating it from Wilms tumor.
  • This study involved a review of MRI scans from 52 confirmed cases of congenital mesoblastic nephroma, categorizing them into classic, cellular, and mixed types, with a focus on their distinct MRI characteristics.
  • Key findings revealed that the classic type was more homogeneous and smaller, while cellular and mixed types were larger and more heterogeneous, with specific MRI signaling patterns noted across all cases.
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