Interventions to improve social network in older people with sensory impairment: a systematic review.

BACKGROUND: Sensory impairment significantly reduces speech discrimination and perception ability, presenting a challenge to effective communication. It can lead to social withdrawal and a reduced social network which can lead to cognitive impairment, seriously affecting the quality of life of older people. However, it is unclear which intervention components are effective to improving social network in older people with sensory impairment. OBJECTIVE: The aim of this systematic review was to summarize interventions designed to improve social network in older people with sensory impairment. METHODS: We searched seven databases from inception to December 1, 2023. Eligible studies included randomized clinical trials (RCT) and quasi-experimental studies of interventions for older people with sensory impairment aimed at improving social networks. Two reviewers searched databases, extracted data, and assessed the quality of the included studies independently. RESULTS: Nine studies including five RCTs and four quasi-experimental studies were selected, enrolling 721 older people with sensory impairment. Methodological quality of the studies was modest. Eight studies demonstrated a positive impact of the interventions used in older people with sensory impairment. The detailed effective intervention components may include communication strategies, resources for older people and their significant others, exercise or tech-back of communication, sensory device fitting, and use and maintenance of sensory devices. CONCLUSION: There are few interventions available for improving social network in older people with sensory impairment. Most interventions mainly focus on communication education and care, and sensory device fitting and education. To improve the social network in older people with sensory impairment, it is necessary to develop more effective, multidisciplinary collaborative effective interventions and conduct more high-quality original studies.

Self-neglect as a mediator between family functioning and healthy aging in older adults living alone in rural China: A cross-sectional study.

OBJECTIVE: This study aims to investigate the mediating role of self-neglect among older adults in the relationship between family functioning and healthy aging. METHODS: A questionnaire survey was conducted between June and September 2023, involving 255 older adults living alone in rural China. The healthy ageing, self-neglect, and family functioning was assessed using the Healthy Aging Instrument;the Elderly Self-neglect Assessment (Rural);and Family Adaptation, Partnership, Growth, Affection, and Resolve (APGAR) scale. RESULTS: Positive correlations were found between family functioning and healthy aging (r = 0.363, p < 0.05). Moreover, self-neglect was identified as a significant mediator, explaining 40.84 % of the total effect. CONCLUSION: Among older adults living alone in rural China, family functioning is significantly associated with healthy aging, with self-neglect mediating this relationship. These findings suggest that community-based interventions aimed at improving family functioning and addressing self-neglect behaviors might be beneficial for promoting healthy aging in this population.

Perceived social support mediates loneliness and social isolation: A cross-sectional study of Chinese older adults relocated for poverty relief.

OBJECTIVES: This study aimed to examine the mediating effect of perceived social support in the relationship between loneliness and social isolation among Chinese older adults relocated for poverty relief. METHODS: We surveyed 128 older migrants from four resettlement areas in Guizhou Province, southwest China. A general information questionnaire, the Lubben Social Network Scale-6, the Perceived Social Support Rating Scale, and the Single Item Loneliness Scale were used in our study. We also used the SPSS macro PROCESS to test a mediation model and the Bootstrap method to assess its significance. RESULTS: The prevalence of social isolation among older relocators was 85.9%; the mediation model showed that loneliness had a direct negative effect on social isolation (B = -1.25, p < 0.01), and that perceived social support fully mediated this effect (-1.18), with a total effect of -1.25 (p < 0.01) and a mediating proportion of 94.4%. CONCLUSIONS: Older relocators in poverty alleviation areas experienced high levels of social isolation. Perceived social support might buffer the negative impact of loneliness on social isolation. We suggest that interventions should be designed to enhance perceived social support and reduce social isolation among this vulnerable population.

A BTB/POZ domain-containing protein negatively regulates plant immunity in Nicotiana benthamiana.

Plants have evolved immune systems to fight against pathogens. However, it is still largely unknown how the plant immunity is finely regulated. Here we identified a BTB/POZ domain-containing protein, namely NbBTB, which is predicted to be a member of the ubiquitin E3 ligase complex. The NbBTB expression is downregulated upon the oomycete pathogen Phytophthora parasitica infection. Overexpression of NbBTB in Nicotiana benthamiana promoted plant susceptibility to P. parasitica infection, and silencing NbBTB increased plant resistance to P. parasitica, indicating that NbBTB negatively modulates plant basal defense. Interestingly, overexpressing or silencing NbBTB did not affect plant resistance to two bacterial pathogens Ralstonia solanacearum and Pseudomonas syringae, suggesting that NbBTB is specifically involved in basal defense against oomycete pathogen. Expression of NbBTB suppressed hypersensitive response (HR) triggered by avirulence proteins from both R. sonanacearum and P. infestans, and silencing NbBTB showed the opposite effect, indicating that NbBTB negatively regulates effector-triggered immunity (ETI). Protein accumulation of avirulence effectors in NbBTB-silenced plants was significantly enhanced, suggesting that NbBTB is likely to negatively modulate ETI by affecting effector protein accumulation. Together, our results demonstrated that NbBTB is a negative regulator in both plant basal defense and ETI.

Establishment of an in vitro method of rabbit embryo toxicity with toxicokinetics study.

This report introduces a novel method, rabbit whole embryo culture (WEC) combined with toxicokinetics (TK), for toxicity testing. Rodent WEC has been extensively used for in vitro screening of developmental toxicity. To improve the reliability of in vitro data, it is important to consider TK and species specificity. To test the utility and effectiveness of this method, we investigated the toxic effect of thalidomide on rabbit embryos and its behavior in test systems both in vitro and in vivo under the same experimental condition. The data showed that thalidomide induced embryo malformations such as embryonic brain hypoplasia, short limb buds, and declined embryonic growth both in vitro and in vivo. The toxic effect increased with the increasing exposure of the embryo to thalidomide. In addition, we observed similar toxic effects and exposure-effect relationships in vivo and in vitro. Therefore, we preliminarily conclude that this new method can effectively predict and explain thalidomide toxicity. Furthermore, we investigated the behavior of test compounds in the WEC system for the first time, and this method is expected to be an important technique for in vitro toxicity study after extensive verification.

CircRNA circ_0005273 contributes to the cisplatin resistance of cervical cancer cells by sponging miR-133b.

Circular RNAs (circRNAs) have been found to play important roles in drug resistance of human neoplasms. The aim of this study was to explore the effect of circ_0005273 on cisplatin (DDP) resistance of cervical cancer (CC) cells and identify its underlying mechanism. The quantitative real-time polymerase chain reaction (qRT-PCR) was performed to analyse circ_0005273 and miR-133b expressions, and cell counting kit-8 (CCK-8), Hoechst 33258 staining and caspase-3 activity analysis were performed to evaluate cell proliferation and apoptosis. Luciferase reporter, RNA binding protein immunoprecipitation (RIP) and RNA pull down assays were applied to explore the interaction between circ_0005273 and miR-133b. Our research showed that circ_0005273 and miR-133b expressions were upregulated and downregulated in DDP-resistant CC cancer tissues and cell lines, respectively. Both of circ_0005273 and miR-133b levels were correlated with FIGO stage, DDP status and overall survival rates. Knockdown of circ_0005273 enhanced the sensitivity of DDP-resistant CC cells to DDP by inhibiting cell proliferation and promoting cell apoptosis. Furthermore, circ_0005273 acts as a competing endogenous RNA to modulate miR-133b expression. Downregulation of miR-133b partly reversed the DDP sensitivity of circ_0005273 knockdown in DDP-resistant CC cells. In summary, our study elucidated the role of circ_0005273/miR-133b axis in DDP resistance of CC cells, which might be a potential therapeutic target for DDP-resistant CC patients. Impact StatementWhat is already known on this subject? The detailed regulatory mechanisms underlying DDP chemoresistance are still unclear. Recently, literatures reported that circ_0005273 exerts a regulatory role in the tumorigenesis and progression of human cancers including thyroid carcinoma, pancreatic carcinoma, colorectal carcinoma and breast carcinoma.What do the results of this study add? Circ_0005273 contributes to the DDP resistance of CC cells via sponging miR-133b.What are the implications of these findings for clinical practice and/or further research? The results help to reverse DDP chemoresistance, and the circ_0005273/miR-133b axis might be a potential therapeutic target for DDP-resistant CC patients.

Hospice care self-efficacy among clinical medical staff working in the coronavirus disease 2019 (COVID-19) isolation wards of designated hospitals: a cross-sectional study.

BACKGROUND: The COVID-19 pandemic has caused more than 462,417 deaths worldwide. A large number of patients with severe COVID-19 face death in hospital. Hospice care is truly a philosophy of care that delivers patient-centred care to the terminally ill and their families. Hospice care could provide many benefits for patients, families, and for hospice caregivers. The aim of this study is to investigate hospice care self-efficacy and identify its predictors among Chinese clinical medical staff in COVID-19 isolation wards of designated hospitals. METHODS: A cross-sectional design was used. The Hospice Care Self-Efficacy, Self-Competence in Death Work Scale, Positive Aspects of Caregiving, and Simplified Coping Style Questionnaires were administered between February and April 2020. A total of 281 eligible medical staff responded to the questionnaires, with a response rate of ≥78.9%. RESULTS: The mean score of hospice care self-efficacy was 47.04 (SD = 7.72). Self-efficacy was predicted by self-competence in death work (B = 0.433, P < 0.001), positive aspects of caregiving (B = 0.149, P = 0.027), positive coping (B = 0.219, P < 0.001), giving hospice care to dying or dead patients before fighting against COVID-19 (B = -1.487, P = 0.023), occupational exposure while fighting against COVID-19 (B = -5.244, P = 0.004), holding respect for life and professional sentiment as motivation in fighting against COVID-19 (B = 2.372, P = 0.031), and grade of hospital employment (B = -1.426, P = 0.024). The variables co-explained 58.7% variation of hospice care self-efficacy. CONCLUSION: Clinical nurses and physicians fighting COVID-19 reported a moderate level of hospice care self-efficacy during this pandemic. Exploring the traditional Chinese philosophy of life to learn from its strengths and make up for its weaknesses and applying it to hospice care may provide a new framework for facing death and dying during the COVID-19 pandemic. Continuous hospice care education to improve self-competence in death work, taking effective measures to mobilize positive psychological resources, and providing safer practice environments to avoid occupational exposure are also essential for the improvement of the hospice care self-efficacy of clinical nurses and physicians. These measures help caregivers deal effectively with death and dying while fighting against the COVID-19 pandemic.

Bioinformatical analysis and prediction of Nicotiana benthamiana bHLH transcription factors in Phytophthora parasitica resistance.

The basic helix-loop-helix (bHLH) family, one of the largest transcription factor groups in plants, regulates many critical developmental processes. However, their functions in plant defense have not been extensively studied in Nicotiana benthamiana, an important model plant species for phytopathology. Here, we identified N. benthamiana bHLH genes (NbbHLHs) using a whole-genome searching approach, and found that the NbbHLHs are highly enriched and some subfamilies are selectively expanded in N. benthamiana. The results showed that gene duplication may be responsible for bHLH family expansion in this plant. Furthermore, we analyzed their expression profiles upon infection with Phytophthora parasitica. Finally, 28 candidate NbbHLHs may play important roles in Phytophthora pathogen resistance using cis-element analysis and protein-interaction network prediction. Taken together, our results established a platform for future studies of the gene family and provide molecular insights into plant immune responses against P. parasitica.

Relative Influence of Trans-Pacific and Regional Atmospheric Transport of PAHs in the Pacific Northwest, U.S.

The relative influences of trans-Pacific and regional atmospheric transport on measured concentrations of polycyclic aromatic hydrocarbons (PAHs), PAH derivatives (nitro- (NPAH) and oxy-(OPAH)), organic carbon (OC), and particulate matter (PM) less than 2.5 µm in diameter (PM2.5) were investigated in the Pacific Northwest, U.S. in 2010-2011. Ambient high volume PM2.5 air samples were collected at two sites in the Pacific Northwest: (1.) Mount Bachelor Observatory (MBO) in the Oregon Cascade Range (2763 m above sea level (asl)) and 2.) Confederated Tribes of the Umatilla Indian Reservation (CTUIR) in the Columbia River Gorge (CRG) (954 m asl). At MBO, the 1,8-dinitropyrene concentration was significantly positively correlated with the time a sampled air mass spent over Asia, suggesting that this NPAH may be a good marker for trans-Pacific atmospheric transport. At CTUIR, NOx, CO2, and SO2 emissions from a 585 MW coal fired power plant, in Boardman OR, were found to be significantly positively correlated with PAH, OPAH, NPAH, OC, and PM2.5 concentrations. By comparing the Boardman Plant operational time frames when the plant was operating to when it was shut down, the plant was found to contribute a large percentage of the measured PAH (67%), NPAH (91%), OPAH (54%), PM2.5 (39%), and OC (38%) concentrations at CTUIR and the CRG prior to Spring 2011 and likely masked trans-Pacific atmospheric transport events to the CRG. Upgrades installed to the Boardman Plant in the spring of 2011 dramatically reduced the plant's contribution to PAH and OPAH concentrations (by ∼72% and ∼40%, respectively) at CTUIR and the CRG, but not NPAH, PM2.5 or OC concentrations.

Fear of negative evaluation: A cross-sectional study among undergraduate nursing students.

OBJECTIVE: To understand the current fear of negative evaluation among undergraduate nursing students and analyse the factors influencing it. METHODS: A general information questionnaire, the scale of fear of negative evaluation, and the fear of positive evaluation scale were used to survey 546 undergraduate nursing students at Guizhou Medical University, China. RESULTS: Undergraduate nursing students scored a total of (15.90 ± 7.18) negative evaluation fears, which is at an intermediate level. Gender, left-behind experience, whether in a romantic relationship, personality, and fear of positive evaluation entered the multiple regression equation and explained 29.1 % of the total variance. CONCLUSIONS: The fear of negative evaluation among undergraduate nursing students was moderate. Nursing students' gender, left-behind experience, whether in a romantic relationship, personality, and fear of positive evaluation were important factors influencing their level of fear of negative evaluation. Nursing educators and administrators should be aware of nursing students' evaluation fears and select targeted evaluation strategies to promote the development of high-quality nursing talent.

Fear of positive evaluation mediates the relationship between self-efficacy and fear of negative evaluation in nursing students: A cross-sectional study.

BACKGROUND: Fear of evaluation (including the negative and positive ones) has been the focus of scholarly attention as one of the core components of social anxiety. However, most existing research has focused on participants with social anxiety. Previous research has suggested that self-efficacy and fear of positive evaluation are associated with fear of negative evaluation. Still, it remains unknown whether there is an association between the three. For undergraduate nursing students in complex social environments, understanding the association between self-efficacy and fear of positive and negative evaluation is essential to facilitate the high-quality development of nursing talent. OBJECTIVE: We aimed to explore the mediating role of fear of positive evaluation in the relationship between self-efficacy and fear of negative evaluation. METHODS: A cross-sectional survey was conducted on 824 undergraduate nursing students using the Brief Fear of Negative Evaluation Scale-Straightforward Items, the Fear of Positive Evaluation Scale, and the General Self-Efficacy Scale. Pearson correlation analysis was used to explore the correlation of the variables. t-test or ANOVA was used as a univariate analysis. A bootstrap test was conducted to verify the mediating effect through the SPSS macro plugin PROCESS v3.3, with P < 0.05 indicating a statistically significant difference. FINDINGS: Self-efficacy, fear of positive evaluation, and fear of negative evaluation were significantly associated. Self-efficacy directly and negatively predicted fear of negative evaluation (B = -3.14, p < 0.001). Fear of positive evaluation partially mediated between self-efficacy and fear of negative evaluation, with a mediating effect size of 38.22 %. DISCUSSION: Self-efficacy can directly and negatively influence fear of negative evaluation. Meanwhile, it can also indirectly reduce the fear of negative evaluation by reducing the fear of positive evaluation. Nursing educators can improve the fear of negative evaluation by increasing students' self-efficacy and encouraging them to view positive assessments correctly.

Influencing factors of sense of responsibility among undergraduate nursing students: A cross-sectional study.

BACKGROUND: Nursing students are critical in responding to public health emergencies like the COVID-19 pandemic. Their ability to fulfill their responsibilities is influenced by their sense of responsibility, which holds profound cultural significance, particularly in traditional Chinese culture. However, limited research has specifically explored the sense of responsibility among undergraduate nursing students in China and globally. OBJECTIVES: This study aimed to determine the sense of responsibility among undergraduate nursing students and identify potential factors associated with it. DESIGN, SETTING & PARTICIPANTS: We conducted a cross-sectional study and recruited 526 nursing students from June to July 2022 in Guizhou province in southwest China. METHODS: Participants completed the General Information Questionnaire, Sense of Responsibility, and Self-esteem Scale. We analyzed the relationship between a sense of responsibility and self-esteem using Spearman correlation analysis. Then we determined factors that affect undergraduate nursing students' sense of responsibility using multiple linear stepwise regression. RESULTS: Nursing students' total sense of responsibility scores were 96(84,106). The study found a positive association between self-esteem and a sense of responsibility (r = 0.433, P < 0.001) and its four dimensions: altruism (r = 0.381, P < 0.001), self-control (r = 0.378, P < 0.001), courage (r = 0.300, p < 0.001), and commitment (r = 0.361, P < 0.001). Self-esteem (ß = 1.532, p < 0.001), personality (extroverted personality ß = 7.263, P < 0.001; neutral personality ß = 3.221, P = 0.029), and social practice experience (ß = -3.156, P = 0.010) significantly influenced undergraduate nursing students' sense of responsibility (R2 = 0.268, F = 17.065, P < 0.001). CONCLUSIONS: The study highlights the importance of nursing students' sense of responsibility and suggests room for improvement in its level. Higher self-esteem was associated with a stronger sense of responsibility. Additionally, self-esteem, personality, and social practice experience emerged as significant influencing factors. Nursing educators should prioritize students' sense of responsibility and explore targeted interventions, such as social practice activities, particularly for students with low self-esteem and introversion.

Self-efficacy and negative silence in the classroom: The mediating role of fear of negative evaluation.

BACKGROUND: Negative silence in the classroom is a usual passive behavior, which means students tend to keep silent and are unwilling to participate in the teaching interaction. It hinders the classroom teaching quality severely. Previous studies have shown both self-efficacy and fear of negative evaluation are related to silent behavior. However, little research has explained whether self-efficacy affects negative silence in the classroom through fear of negative evaluation. PURPOSE: To investigate the relationships between self-efficacy, fear of negative evaluation and negative silence in the classroom. METHODS: A cross-sectional survey using convenience sampling was conducted to collect data from 568 undergraduate nursing students from a higher medical institution in Guizhou Province, west of China, from October to November 2021. the T-Test or analysis of variance was used as a univariate analysis and the Bootstrap test was applied to verify the mediating effect. FINDINGS: Nursing students' self-efficacy was negatively related to both fear of negative evaluation and negative silence in the classroom（r = -0. 188, P＜0. 05; r = -0. 298, P＜0. 05, respectively; fear of negative evaluation was positively related to negative classroom silence（r = 0. 392, P＜0. 05; mediation analysis showed the mediating effect of fear of negative evaluation accounted for 23. 53% of the total [Effect Value= -0. 08, 95%CI（- 0. 12，- 0. 03]. DISCUSSION: Fear of negative evaluation partially mediates the relationship between self-efficacy and negative silence in the classroom. Therefore, reducing nursing students' negative evaluation fear can be used as a target for interventions to address nursing students' negative classroom silence issue, promoting the quality of classroom teaching and learning.

Negative silence in the classroom: A cross-sectional study of undergraduate nursing students.

OBJECTIVE: To investigate the concept of negative silent behavior of undergraduate nursing students and its influencing factors. METHODS: A cross sectional study was conducted by using convenience sampling, and 269 nursing students enrolled from August-September 2021 in a higher medical institution in Guizhou Province were selected for the study and surveyed using the general information questionnaire, the degree of negative classroom silence scale, and a questionnaire on the factors influencing negative classroom silence. Multiple linear regression was used to analyze the influencing factors of classroom negative silence among nursing students. RESULTS: The degree of negative silence in the nursing students' classroom was (2.75 ± 0.50), which was at a relatively active level. Multiple linear regression showed that teacher pedagogy and student literacy were influential factors in the degree of negative silence in nursing students' classrooms (p < 0.05). CONCLUSIONS: The level of negative silence in nursing students' classrooms is at a relatively active level, and teacher pedagogy and student literacy are the main influencing factors. Nurse educators should pay attention to the problem of negative silence of students in the classroom and prevent and intervene early to ensure the quality and effectiveness of classroom teaching and learning.

Characteristics, correlations and health risks of PCDD/Fs and heavy metals in surface soil near municipal solid waste incineration plants in Southwest China.

As primary anthropogenic emission source of toxic pollutants such as heavy metals and polychlorinated dibenzo-p-dioxins and dibenzofurans (PCDD/Fs), municipal solid waste (MSW) incineration has caused worldwide concern. However, a comprehensive analysis of the pollution characteristics and health risks of PCDD/Fs and heavy metals in soils around MSW incineration plants is lacking. In this study, 17 PCDD/Fs and 11 heavy metals in soil samples collected near MSW incineration plants in Sichuan province were investigated to evaluate their pollution characteristics and potential health risk. Sichuan was selected as the study area because the MSW incineration amount in this province ranks first among all inland provinces in China. The PCDD/Fs concentrations ranged from 0.30 to 7.50 ng I-TEQ/kg, which were significantly below risk screening and intervention thresholds. Regarding heavy metals, principal component analysis suggested that Hg, Pb and Zn were the primary metals emitted from the MSW incineration plants. Cluster analysis of PCDD/Fs and heavy metals showed that of PCDD/Fs homologs and heavy metals (e.g., Hg, Pb, Zn and Cd) were clustered into one group, indicating the coexistence and coaccumulation of heavy metals (especially Hg, Pb, Zn, and Cd) and PCDD/Fs in soil. These heavy metals are thus candidate tracers for PCDD/Fs in soil near MSW incineration plants. A health risk analysis found that the carcinogenic and non-carcinogenic risks of PCDD/Fs and heavy metals (except for Ni) in the soil samples were all within acceptable levels. This study provides new insights into correlations and health risks of PCDD/Fs and heavy metals in surface soil near MSW incineration plants. The findings have implications for future studies of environmental and human health risk analysis related to waste incineration.

Nonlinear relationship between early postnatal weight gain velocity and neurodevelopmental outcomes in very-low birth weight preterm infants: A secondary analysis based on a published prospective cohort study.

Background: Extrauterine growth restriction among the very-low birth weight preterm infants (VLBWPIs) is associated with poorer cognitive development outcome, while the rapid weight gain in infancy increases the long-term risk of obesity and noncommunicable disease among VLBWPIs. However, the results of research on the association between early postnatal growth velocity and neurodevelopmental outcomes in VLBWPIs are still limited and controversial. Objective: We aimed to explore the association between the growth velocity in early postnatal and neurodevelopmental impairment (NDI) among VLBWPIs. Methods: This study was a secondary analysis of a previously published prospective cohort. It was based on data on 1,791 premature infants with a birth weight of less than 1500 g, registered in the database of the Premature Baby Foundation of Taiwan between 2007 and 2011. A binary logistic regression model was used to evaluate the association between the weight gain velocity in different periods [from birth to 6 months corrected age (CA), 6 to 12 months CA, and 12 to 24 months CA] and NDI, respectively. The generalized additive model and the smooth curve fitting (penalized spline method) were used to address nonlinearity, and a two-piece-wise binary logistic regression model was added to explain the nonlinearity further. Results: Nonlinearities were observed between NDI and the weight gain velocity from birth to 6 months CA [inflection point 20.36, inflection point: OR = 1.01, 95% CI 0.97-1.05], 6-12 months CA [inflection point 9.44, inflection point: OR = 1.05, 95% CI 1.05-(1.00, 1.11)], and 12-24 months CA [inflection point 16.00, inflection point: OR = 1.75, 95% CI 1.05-(0.96, 3.08)]. Conclusion: The neurodevelopmental benefits from a rapid weight gain velocity from birth to 24 months CA might be limited once the growth pace reaches an optimum level. It would help find a pattern of growth that facilitates optimal neurodevelopment, yet minimizes negative health consequences associated with overnutrition further.

Characterization of saccharides in size-fractionated ambient particulate matter and aerosol sources: the contribution of primary biological aerosol particles (PBAPs) and soil to ambient particulate matter.

Size-fractionated (equivalent to ambient PM2.5 and PM10) local soil, plant, and spore samples were collected in the Sonoran Desert near Phoenix, AZ and measured for saccharide content with the goal of characterizing ambient particulate matter sources including soil and primary biological aerosol particles (PBAPs) from plants and fungi. Different saccharide compositions were observed among soil, plant, and spore samples and between PM2.5 and PM10 fractions. The total measured nonlevoglucosan saccharide content relative to PM mass in ambient aerosols collected in a Phoenix suburb (Higley) was much higher compared to the local soil samples but much lower compared to the PBAP. The enrichment of saccharides from two saccharide-dominated PM source factors resolved by a positive matrix factorization model is also higher than the saccharide content in the size-fractionated local soil samples, but lower than that measured in the size-segregated PBAP samples. This indicates that ambient concentration of particulate saccharides at Higley was dominated by contributions from PBAPs directly injected into the atmosphere from plants and spores rather than from soil and associated biota. Our results also suggest the contribution to the fine size fraction of ambient PM from the primary biologically derived sources may be greater than previously acknowledged.

Concentration and photochemistry of PAHs, NPAHs, and OPAHs and toxicity of PM2.5 during the Beijing Olympic Games.

Atmospheric particulate matter with diameter <2.5 um (PM(2.5)) was collected at Peking University (PKU) in Beijing, China before, during, and after the 2008 Olympics and analyzed for black carbon (BC), organic carbon (OC), lower molecular weight (MW < 300) and MW302 Polycyclic Aromatic Hydrocarbons (PAHs), nitrated PAHs (NPAHs) and oxygenated PAHs (OPAHs). In addition, the direct and indirect acting mutagenicity of the PM(2.5) and the potential for DNA damage to human lung cells were also measured. Significant reductions in BC (45%), OC (31%), MW< 300 PAH (26-73%), MW 302 PAH (22-77%), NPAH (15-68%), and OPAH (25-53%) concentrations were measured during the source control and Olympic periods. However, the mutagenicity of the PM(2.5) was significantly reduced only during the Olympic period. The PAH, NPAH, and OPAH composition of the PM(2.5) was similar throughout the study, suggesting similar sources during the different periods. During the source control period, the parent PAH concentrations were correlated with NO, CO, and SO(2) concentrations, indicating that these PAHs were associated with both local and regional emissions. However, the NPAH and OPAH concentrations were only correlated with the NO concentrations, indicating that the NPAH and OPAH were primarily associated with local emissions. The relatively high 2-nitrofluoranthene/1-nitropyrene ratio (25-46) and 2-nitrofluoranthene/2-nitropyrene ratio (3.4-4.8), suggested a predominance of photochemical formation of NPAHs through OH-radical-initiated reactions in the atmosphere. On average, the ∑NPAH and ∑OPAH concentrations were 8% of the parent PAH concentrations, while the direct-acting mutagenicity (due to the NPAH and OPAH) was 200% higher than the indirect-acting mutagenicity (due to the PAH). This suggests that NPAH and OPAH make up a significant portion of the overall mutagenicity of PM(2.5) in Beijing.

Qilin Pill Exerts Therapeutic Effect on Resection-Induced Premature Ovarian Insufficiency Rats by Inhibiting the MAPK and PI3K-AKT Signaling Pathways.

BACKGROUND: The Qilin pill (QLP) is a traditional Chinese compound prescription comprising 15 herbs that has demonstrated significant therapeutic effects on premature ovarian insufficiency (POI) in recent years. However, a pharmacological evaluation of QLP on ovarian function remains to be conducted, and the key mechanism of QLP treatment on POI is unclear. METHODS: Premature ovarian insufficiency rats were established by bilateral partial ovariectomy. The model rats were administrated with low (QLP-L), medium (QLP-M) and high (QLP-H) doses of QLP for 4 weeks to evaluate the ovarian function in terms of estrous cycle, hormone level, and follicle count. The mechanism of QLP in the treatment of POI was systematically explored by network pharmacology, and expression levels of the MAPK and PI3K-AKT signaling pathways were verified by Western blotting and molecular docking. RESULTS: The rat model of resection-induced POI was successfully established, and QLP could significantly recover the estrous cycle, decrease serum FSH levels, and decelerate follicle depletion after 4 weeks of administration. The optimal dose of QLP in the experiment was preliminarily determined to be 0.9 g/kg. Based on the network pharmacology methods, we constructed the compound-target network and protein protein interaction (PPI) network of QLP for the treatment of POI. The experimental verification of the enrichment analysis showed that QLP inhibited the MAPK and PI3K-AKT signaling pathways, and the key compounds and key targets involved were verified by molecular docking. CONCLUSION: QLP exerted significant therapeutic effects on resection-induced POI rats, and this was achieved by the inhibition of the MAPK and PI3K-AKT signaling pathways. This study is the first to systematically investigate the effects and mechanism of QLP on POI rats, which will provide valuable guidance in clinic.

A Phytophthora capsici effector suppresses plant immunity via interaction with EDS1.

EDS1 (Enhanced Disease Susceptibility 1) plays a crucial role in both effector-triggered immunity activation and plant basal defence. However, whether pathogen effectors can target EDS1 or an EDS1-related pathway to manipulate immunity is rarely reported. In this study, we identified a Phytophthora capsici Avirulence Homolog (Avh) RxLR (Arg-any amino acid-Leu-Arg) effector PcAvh103 that interacts with EDS1. We demonstrated that PcAvh103 can facilitate P. capsici infection and is required for pathogen virulence. Furthermore, genetic evidence showed that PcAvh103 contributes to virulence through targeting EDS1. Finally, PcAvh103 specifically interacts with the lipase domain of EDS1 and can promote the disassociation of EDS1-PAD4 (Phytoalexin Deficient 4) complex in planta. Together, our results revealed that the P. capsici RxLR effector PcAvh103 targets host EDS1 to suppress plant immunity, probably through disrupting the EDS1-PAD4 immune signalling pathway.