Publications by authors named "Kok A"

Background: Few studies have addressed the association of sleep disturbances with incident dementia with long lag times. We add to this literature by investigating how lag times varying from 2.2 to 23.

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Noise simulations are an important part of noise studies that investigate the impact of noise sources on the environment. In noise simulation, noise levels at receiver points are calculated based on the noise propagation paths between the receiver and source points. These paths are derived from the height of the terrain.

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Background: Chronic diseases may negatively interfere with the course of depression. Our aim was to examine whether the association between chronic disease and course of depression is moderated by mastery.

Method: N = 1146 persons, aged 18-88, with depressive disorder according to DSM-IV criteria were followed for two years.

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This study covers Child Sexual Abuse (CSA) survivors who had never disclosed the abuse until their psychiatric interview. There is a clear lack of understanding of which factors contribute to delays in the disclosure of CSA. Thus, we aimed to examine the risk factors and sociodemographic variables that may inhibit CSA disclosures.

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Background/objectives: Loading of natural products into poly-(lactide-co-glycolic) acid (PLGA) nanoparticles as drug delivery systems for the treatment of diseases, such as tuberculosis (TB), has been widely explored. The current study investigated the use of PLGA nanoparticles with 7-methyljuglone (7-MJ), an active pure compound, isolated from the roots of A. DC.

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Background: Dental caries, also known as tooth decay or cavity formation, is one of the world's most widespread dental conditions. It is a plaque-related infection caused mainly by Streptococcus mutans. People have relied on several plant species to treat oral infections; Heteropyxis natalensis, for example, has been used to treat toothache and gum infections.

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Highly pathogenic avian influenza A(H5) viruses globally impact wild and domestic birds, and mammals, including humans, underscoring their pandemic potential. The antigenic evolution of the A(H5) hemagglutinin (HA) poses challenges for pandemic preparedness and vaccine design. Here, the global antigenic evolution of the A(H5) HA was captured in a high-resolution antigenic map.

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Article Synopsis
  • This study examined the link between plasma biomarkers indicating endothelial dysfunction and cognitive performance in a sample of 9,414 older adults from the Netherlands, aged 57 to 93 years.
  • Researchers created a composite score from three specific biomarkers and assessed various cognitive functions like executive function and memory.
  • Results indicated a small, consistent association between higher endothelial dysfunction scores and poorer cognitive performance, but no evidence suggested that these markers influenced cognitive decline over time.
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Purpose: Amphetamine-type stimulants are very common, and their usage is becoming a very big social problem all over the world. Thousands of addicts encounter several health problems including mental, metabolic, behavioral and neurological disorders. In addition to these, there are several reports about the elevated risk of tendency on committing criminal cases by addicted persons.

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Objectives: To gain insight into the longitudinal, reciprocal associations between depressive symptoms and sexual satisfaction as well as the potential moderating roles of gender and perceived importance of sexuality.

Method: We analyzed longitudinal data from 2113 participants of the Longitudinal Ageing Study Amsterdam (LASA) with an initial age range of 54-93 years, using Generalized Estimating Equations (GEE).

Results: There were no significant associations between baseline depressive symptoms and change in sexual satisfaction, nor between baseline sexual satisfaction and change in depressive symptoms.

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The economic burden of diseases and reproductive inefficiency in dairy cattle is evident and has been quantified. Dairy diseases and reproductive inefficiency are however associated with other issues as well, including animal welfare, environmental pressure, and public health risks. Quantifying these other issues is becoming important to help farmers make decisions.

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The early lactation period in dairy cows is characterized by complex interactions among energy balance (EB), disease, and alterations in metabolic and inflammatory status. The objective of this study was to cluster cows based on EB time profiles in early lactation and investigate the association between EB clusters and inflammatory status, metabolic status, oxidative stress, and disease. Holstein-Friesian dairy cows (n = 153) were selected and monitored for disease treatments during wk 1 to 6 in lactation.

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Article Synopsis
  • The study investigates how health behaviors like smoking, physical inactivity, and alcohol use may mediate the relationship between depression, anxiety, and different types of cancer, including lung and breast cancer.
  • Utilizing data from 18 cohorts with a total of 319,613 participants, the researchers performed two-stage meta-analyses to analyze these associations and calculate the mediating effects.
  • Results showed that smoking and physical inactivity significantly mediated links between depression, anxiety, and lung cancer, highlighting the importance of smoking cessation programs for individuals dealing with mental health issues.
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Prolonging dairy cattle longevity is regarded as one of the options to contribute to more sustainable milk production. Because failure to conceive is one of the main reasons for culling, this study investigates how adjustments in reproduction management affect partial net return at herd level and greenhouse gas emissions per unit of milk, using a dynamic stochastic simulation model. The effects of reproduction decisions that extend cattle longevity on milk yield, calving interval and pregnancy rate were derived from actual performance of Dutch commercial dairy cows over multiple lactations.

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Article Synopsis
  • The study investigates how peak expiratory flow rate (PEFR), an indicator of health outcomes, changes with age among older adults in a 13-year follow-up.
  • It identifies three declining PEFR trajectories in older men (high, intermediate, low) and two in women (high, low), with different prevalence rates and notable health characteristics linked to each trajectory.
  • The findings suggest that a single PEFR measurement can predict an older adult's likely health trajectory, as differences in PEFR trajectories are mainly based on initial levels rather than the rate of decline.
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Spousal bereavement is associated with health declines and increased mortality risk, but its specific impact on physical and cognitive capabilities is less studied. A historical cohort study design was applied including married Tromsø study participants (N=5739) aged 50-70 years with baseline self-reported overall health and health-related factors and measured capability (grip strength, finger tapping, digit symbol coding, and short-term recall) at follow-up. Participants had data from Tromsø4 (1994-1995) and Tromsø5 (2001), or Tromsø6 (2007-2008) and Tromsø7 (2015-2016).

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Background: Metabolism is an important component of the kinetic characteristics of herbal constituents, and it often determines the internal dose and concentration of these effective constituents at the target site. The metabolic profile of plant extracts and pure compounds need to be determined for any possible herb-drug metabolic interactions that might occur.

Methods: Various concentrations of the essential oil of Lippia scaberrima, the ethanolic extract of Lippia scaberrima alone and their combinations with fermented and unfermented Aspalathus linearis extract were used to determine the inhibitory potential on placental, microsomal and recombinant human hepatic Cytochrome P450 enzymes.

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Background: Depressive symptoms are associated with an increased risk of Alzheimer's disease (AD). There has been a recent emergence in plasma biomarkers for AD pathophysiology, such as amyloid-beta (Aβ) and phosphorylated tau (p-tau), as well as for axonal damage (neurofilament light, NfL) and astrocytic activation (glial fibrillary acidic protein, GFAP). Hypothesizing that depressive symptoms may occur along the AD process, we investigated associations between plasma biomarkers of AD with depressive symptoms in individuals without dementia.

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In this study, Senescence Accelerated Mice (SAMP8) were supplemented with exogenous DHA milk, endogenous DHA milk, normal milk, or 0.9 % saline solution. Enzyme-linked immunosorbent assay (ELISA), gas chromatography (GC), ultra-performance liquid chromatography-electrospray ionization-tandem mass spectrometry (UPLC-ESI MS/MS), and Morris water maze were used to characterize the effects of diet on oxidative stress and cognition in SAMP8 mice.

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Objectives: Despite expanding knowledge about the internal and external resources that contribute to resilience among individuals who have experienced depression, the long-term accessibility and protectiveness of these resources across different stressors is unknown. We investigated whether and how the resilience resources of individuals who previously recovered from late-life depression remained protective during the COVID-19 pandemic.

Methods: We used a sequential explanatory mixed methods design.

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In this cohort profile article we describe the lifetime major depressive disorder (MDD) database that has been established as part of the BIObanks Netherlands Internet Collaboration (BIONIC). Across the Netherlands we collected data on () lifetime MDD diagnosis in 132,850 Dutch individuals. Currently, = 66,684 of these also have genomewide single nucleotide polymorphism (SNP) data.

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Protected areas are typically managed as a network of sites exposed to varying anthropogenic conditions. Managing these networks benefits from monitoring of conditions across sites to help prioritize coordinated efforts. Monitoring marine vessel activity and related underwater radiated noise impacts across a network of protected areas, like the U.

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Highly pathogenic avian influenza viruses (HPAIVs) cause severe hemorrhagic disease in terrestrial poultry and are a threat to the poultry industry, wild life, and human health. HPAIVs arise from low pathogenic avian influenza viruses (LPAIVs), which circulate in wild aquatic birds. HPAIV emergence is thought to occur in poultry and not wild aquatic birds, but the reason for this species-restriction is not known.

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(1) Background: Chemoradiotherapy (CRT) for head and neck cancer (HNC) is associated with severe toxicity resulting in fatigue and weight loss, including loss of skeletal muscle mass. Exercise interventions might positively affect physical fitness and quality of life. Sufficient adherence and compliance rates are necessary for optimal effects.

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