Epigenetic transgenerational effects of PM2.5 collected from southern Taiwan on sperm functions and DNA methylation in mouse offspring.

During respiration, particulate matter with a diameter of 2.5 µm or less (PM2.5) suspended in the atmosphere enters the terminal alveoli and blood. PM2.5 particles can attach to toxic substances, resulting in health problems. Limited information is available regarding the effects of prenatal exposure to water-soluble PM2.5 (WS-PM2.5) and water-insoluble PM2.5 (WI-PM2.5) on male reproduction. In addition, whether exposure to these particles has transgenerational effects remains unknown. We investigated whether prenatal exposure to WS-PM2.5 and WI-PM2.5 disrupts sperm function in generations F1, F2, and F3 of male mice. Pregnant BALB/c mice were treated using intratracheal instillation on gestation days 7, 11, and 15 with 10 mg of a water extract or insoluble PM2.5. On postnatal day 105, epididymal sperm count, motility, morphology, mitochondrial membrane potential (MMP), reactive oxygen species (ROS) production, the sperm chromatin DNA fragmentation index (DFI), and testicular DNA methyltransferase (Dnmt) levels were evaluated in all generations. Whole-genome bisulfite sequencing was used to analyze the DNA methylation status of generation F3. According to the results, exposure to WS-PM2.5 affected sperm morphology, ROS production, and mean DFI in generation F1; ROS production and mean DFI in generation F2; and sperm morphology and MMP in generation F3. Similarly, exposure to WI-PM2.5 affected sperm morphology, ROS production, mean DFI, %DFI, and Dnmt1 expression in generation F1; sperm morphology, MMP, and ROS production in generation F2; and sperm morphology, ROS, and %DFI in generation F3. Two hypermethylated genes, PRR16 and TJP2, were observed in the WS-PM2.5 and WI-PM2.5 groups, two hypomethylated genes, NFATC1 and APOA5, were observed in the WS-PM2.5 group, and two hypomethylated genes, ZFP945 and GSE1, were observed in the WI-PM2.5 group. Hence, prenatal exposure to PM2.5 resulted in transgenerational epigenetic effects, which may explain certain phenotypic changes in male reproduction.

Fetal dose assessment in a pregnant patient with brain tumor: A comparative study of proton PBS and 3DCRT/VMAT radiation therapy techniques.

PURPOSE: The treatment of brain tumors in pregnant patients poses challenges, as the out-of-field dose exposure to the fetus can potentially be harmful. A pregnant patient with prior radiation treatment was presented with a brain tumor at our clinic. This work reports on our pre-treatment study that compared fetal dose exposure between intensity-modulated proton therapy (IMPT) using pencil beam scanning (PBS) and conventional photon 3D conformal radiation therapy (3DCRT) and volumetric-modulated arc therapy (VMAT), and the subsequent pregnant patient's radiation treatment. MATERIALS AND METHODS: Pre-treatment measurements of clinical plans, 3DCRT, VMAT, and IMPT, were conducted on a phantom. Measurements were performed using a device capable of neutron detections, closely following AAPM guidelines, TG158. For photon measurements, fetus shielding was utilized. On patient treatment days, which was determined to be proton treatment, shielding was used only during daily imaging for patient setup. Additionally, an in vivo measurement was conducted on the patient. RESULTS: Measurements showed that IMPT delivered the lowest fetal dose, considering both photon and neutron out-of-field doses to the fetus, even when shielding was implemented for photon measurements. Additionally, the proton plans demonstrated superior treatment for the mother, a reirradiation case. CONCLUSION: The patient was treated with proton therapy, and the baby was subsequently delivered at full term with no complications. This case study supports previous clinical findings and advocates for the expanded use of proton therapy in this patient population.

Factors influencing acceptance or decline of a hospital-sponsored scholarship by nursing students in Taiwan: a qualitative descriptive study.

BACKGROUND: Maintaining sufficient nursing personnel is critical for healthcare systems worldwide. Improving retention of nurses is one means of addressing this shortfall. To foster retention, some hospitals in Taiwan provide nursing scholarships contingent on recipients signing a 3-year employment contract. However, it is unclear what factors influence students' decisions to accept or reject a scholarship. METHODS: The purpose of this exploratory qualitative descriptive study was to obtain an understanding of the subjective experiences of fourth-year nursing school students (N = 87) who accepted (n = 43) or declined (n = 44) a hospital-sponsored nursing school scholarship. Students were selected by purposive sampling from the department of nursing of a private university in northern Taiwan. Data were collected between 2013 and 2014 using face-to-face-in-depth interviews. RESULTS: The mean age of participants was 22.7 years; most (94%) were female (n = 82). Analysis of the interview data showed the choice to accept or decline the scholarship and making career decisions occurred in three stages for both groups: the considering their options, making the decision, and assessment of their decision. CONCLUSIONS: Although the variables at each of these stages differed between groups, both sponsored and non-sponsored students felt a responsibility to continue as employees of the hospital after graduation. Financial status, the hospital environment, and future long-term career goals were important factors affecting the acceptance or rejection of the hospital scholarship. These results could provide insight into factors students consider important for making long-term commitments as a nursing professional, which could not only improve retention of nurses, but also serve as a guideline for career planning.

[The Impact of the COVID-19 Pandemic on the Health and Coping Behaviors of Patients With Treatment-Resistant Depression].

BACKGROUND: The COVID-19 pandemic has had a disastrous impact globally. For the general public and for people with mental illnesses, this pandemic may cause mental/physical stress and major life impacts. PURPOSE: This study was designed to explore the related changes in daily life and impacts on the well-being of a group of patients with chronic treatment-resistant depression (TRD) during the COVID-19 pandemic. METHODS: This study was a part of a long-term, follow-up study of a cohort of patients with TRD collected in 2018. All of the subjects who were diagnosed with major depression and fit the inclusion criteria were referred by the psychiatrists from two teaching hospitals. Structured interviews were used to collect data on physical and psychological changes during the pandemic period between January and May 2020. The researchers organized the key points by recording or note taking. Thematic analysis was used to summarize and classify themes and units. RESULTS: The 116 respondents revealed that the COVID-19 pandemic affected their health in the biological, psychological, and social dimensions. The three emerging themes included: The threatening of homogeneity in the whole person's health, the interaction between bio-psycho-social aspects, and positive growth of individuals with TRD. Although the participants had confidence in the prevention strategies of the government related to COVID-19, they expressed feelings of distress and restlessness with regard to COVID-19-related news reports. CONCLUSIONS / IMPLICATIONS FOR PRACTICE: The COVID-19 pandemic has affected the health of patients with TRD in both positive and negative ways. As the goal of government preventive strategies is to protect and promote public health, regular attention should be paid to the negative effects of long-term exposure to pandemic-related news on this vulnerable population.

Determining lead, cadmium and mercury in cosmetics using sweeping via dynamic chelation by capillary electrophoresis.

International limits have been established for metal impurities in cosmetics to prevent overexposure to heavy metal ions. Sweeping via dynamic chelation was developed using capillary electrophoresis to analyze lead (Pb), cadmium (Cd) and mercury (Hg) impurities in cosmetics. The sweeping via dynamic chelation mechanism involves a large volume of metal ions being swept by a small quantity of chelating agents that were electrokinetically injected into the capillary to chelate metal ions and increase the detection sensitivity. The optimized conditions were as follows: Firstly, the capillary was rinsed by a 0.6 mM TTAB solution to reverse the EOF. The sample solution, which was diluted using 25 mM ammonium acetate (pH 6.0), was injected into the capillary using a pressure of 3.5 psi for 99.9 s. Then, EDTA was injected at -25 kV for 1 min from the EDTA buffer (25 mM ammonium acetate containing 0.6 mM TTAB and 5 mM EDTA), and the metal ions were swept and stacked simultaneously. Finally, the separation was performed at -20 kV using a separation buffer (100 mM ammonium acetate (pH 6.0)). A small quantity of chelating agents introduced into the capillary could yield 33-, 50- and 100-fold detection improvements for Pb, Cd and Hg, respectively, more sensitive than conventional capillary zone electrophoresis. Correlation coefficients greater than 0.998 indicated that this method exhibited good linearity. The relative standard deviation and relative error were less than 8.7%, indicating high precision and accuracy. The recovery value of the homemade lotion, which was employed to simulate the real sample matrix, was 93-104%, which indicated that the sample matrix does not affect the quantitative results. Finally, commercial cosmetics were employed to demonstrate the feasibility of the method to determine Pb, Cd and Hg without complicated sample pretreatment. Graphical Abstract The procedure of analyzing metal ions in cosmetics by sweeping via dynamic chelation.

[The Perspectives and Expectations of New Nursing Graduates Regarding the Hospital-Based Nursing Students Scholarship].

BACKGROUND: The hospital-based scholarship is a relatively recent incentive used by hospitals to recruit new nursing graduates. Few studies have explored the impact of these scholarship programs on hospital recruitment. PURPOSE: To explore the perspectives and expectations of new nursing graduates on the application of a hospital-based scholarship for nursing students. METHODS: This study used a qualitative research approach. Purposive sampling was used to recruit 20 new nursing graduates from one university in northern Taiwan in 2013. Content analysis was applied to analyze the data. RESULTS: Two themes were identified by participants who had applied for a hospital-based scholarship: "aspire to be a nursing-scholarship recipient and work towards this aspiration" and "look forward to receiving a nursing-scholarship and imagine possible features of the future life." One theme was identified by participants who had not applied for a hospital-based scholarship: "agree with the policy of hospital-based scholarship but resist the restrictions on their life." CONCLUSIONS / IMPLICATIONS FOR PRACTICE: Although both groups agreed that the scholarship program helped relieve financial stresses, participants who had applied for the scholarship tended to hold positive and aggressive attitudes towards the nursing scholarship. Conversely, participants who had not applied for the scholarship did so due to the perceived conflicts between the scholarship and their career plans. It is recommended to consider providing career-planning assistance to new graduates and to arrange that students who sign a scholarship contract have their clinical practice in their working unit in order to improve adaptation.

Enhanced nitrate reduction over functionalized Pd/Cu electrode with tunable conversion to nitrogen and sodium hydroxide recovery.

Development of heteroatomic electrocatalysts with a particular geometric structure for wastewater denitrification remains a formidable challenge. Herein, we reported the fabrication of a series of PdCu electrodes with Pd electrodeposition times varying from 60 s to 360 s. Physiochemical and electrochemical techniques were used to analyze the structure, morphology and activity of as prepared catalytic electrodes. XRD data revealed the formation of a PdCu alloy, while a reduced particle sizes (ca. 5.3 nm) and a uniform distribution of Pd over Cu was demonstrated by TEM. The XPS measurement indicated the presence of redox (Pd0 and Cu+2) states hence demonstrating the formation of a PdCu alloy. A nitrate removal efficiency of ~98 %, N2 selectivity ~86 % with an alkali recovery of 335 mM was obtained over Pd/Cu 180 s at 0.68 mA cm-2. Enhanced nitrate reducibility and extended durability reveal the viability of a novel electrocatalytic and electrodialysis system for degrading NO3- in water, as well as a system for efficiently recovering liquid alkali.

Atypical Anxiety-Related Amygdala Reactivity and Functional Connectivity in Sant Mat Meditation.

While meditation has drawn much attention in cognitive neuroscience, the neural mechanisms underlying its emotional processing remains elusive. Sant Mat meditators were recruited, who adopt a loving-kindness mode of meditation along with a vegetarian diet and an alcohol-restricted lifestyle and novices. We assessed their State-Trait Anxiety Inventory (STAI) and scanned their amygdala reactivity in response to an explicit and implicit (backward masked) perception of fearful and happy faces. In contrast with novices, meditators reported lower STAI scores. Meditators showed stronger amygdala reactivity to explicit happiness than to fear, whereas novices exhibited the opposite pattern. The amygdala reactivity was reduced in meditators regardless of implicit fear or happiness. Those who had more lifetime practice in meditation reported lower STAI and showed a weaker amygdala response to fear. Furthermore, the amygdala in meditators, relative to novices, had a stronger positive functional connectivity with the ventrolateral prefrontal cortex (PFC) to explicit happiness, but a more negative connectivity with the insula and medial orbitofrontal cortex (OFC) to explicit fear. Mediation analysis indicated the amygdala reactivity as the mediator for the linkage between meditation experience and trait anxiety. The findings demonstrate the neural correlates that underpin the beneficial effects of meditation in Sant Mat. Long-term meditation could be functionally coupled with the amygdala reactivity to explicit and implicit emotional processing, which would help reduce anxiety and potentially enhance well-being.

Evaluation of neutron dose equivalent from the Mevion S250 proton accelerator: measurements and calculations.

Neutron production is of concern for proton therapy, especially for passive scattering proton beam delivery methods. The levels of neutron dose equivalent vary significantly with system design and treatment parameters. The purpose of this study was to examine neutron dose equivalent per therapeutic dose (H/D) around the Mevion S250 proton therapy system, a novel design of proton therapy systems. The benchmark comparisons between measurement and simulation were found to be within a factor of 2 for most cases. The H/D values were evaluated as a function of various parameters. The results showed that, at a standard reference condition (10 × 10 cm(2) field size, distance 1 m detector-to-isocenter lateral to the primary proton beam direction), the H/D values range from 0.72 to 3.37 mSv Gy(-1) for all configurations studied. The H/D values generally (1) decreased as the neutron detectors moved away from the isocenter, (2) decreased with increasing aperture field sizes, (3) increased with increasing angle from the initial beam axis and (4) were independent of treatment nozzle position. The H/D trends were consistent with other existing passive scattering proton accelerators reported in the literature.