scholarly journals Temporal changes in metal concentrations in a polluted urban basin: the contribution of multivariate techniques to the evaluation of their recovery

2021 ◽  
Author(s):  
Mariel Alejandra Tripodi ◽  
Gerardo Ruben Cueto ◽  
Emiliano Muschetto ◽  
Diego Hancke ◽  
Olga Virginia Suárez
Keyword(s):  
Meteorological Factors ◽  
Temporal Trends ◽  
Environmental Pollutants ◽  
Temporal Changes ◽  
Multivariate Techniques ◽  
Metal Concentrations ◽  
Factors Associated ◽  
Sources Of Pollution ◽  
Heavy Metals Pollution ◽  
Different Sources

Abstract In urban rivers in many fast-growing cities, heavy metals pollution is one of the major quality issues. Quantifying its recovery success seems to be a difficult but necessary challenge, in part, because a complex database is generally needed to assess water quality. The overall goal of this work was to evaluate temporal changes in metal concentrations in a polluted basin applying the AEM method and to determine the physicochemical and meteorological parameters associated with these changes using the RDA. We analyzed temporal changes of 15 sites located in the Matanza Riachuelo River Basin, one of the most polluted basins in the word. For this, we collected data of metal concentrations in surface water, physicochemical parameters of water and meteorological factors of eight years (2008 to 2015) in each site. The results of this work allowed make evident temporal patterns (at different scales) in metal concentrations and several factors associated with these patterns. Also, we found that the effects of physicochemical and meteorological factors in metal concentrations were dependent of each site, possibly related to the presence of different sources of pollution or characteristics of the river. Our study showed that the combination of AEM and RDA multivariate techniques is a useful tool for both detecting temporal trends in the concentrations of environmental pollutants, which are not easily detectable in highly degraded environments, and for evaluating factors associated with these changes. These techniques could be applied to different scenarios (aquatic and terrestrial) affected by the continuous advance of human activities.

Origins and characteristics of urban wet weather pollution in combined sewer systems: the experimental urban catchment “Le Marais” in Paris

1998 ◽  
Vol 37 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Marie-Christine Gromaire-Mertz ◽  
Ghassan Chebbo ◽  
Mohamed Saad
Keyword(s):  
Waste Water ◽  
Sewer System ◽  
Urban Catchment ◽  
Rainfall Events ◽  
Sources Of Pollution ◽  
Sewer Systems ◽  
Combined Sewer ◽  
Wet Weather ◽  
Wet Weather Flow ◽  
Different Sources

An experimental urban catchment has been created in the centre of Paris, in order to obtain a description of the pollution of urban wet weather flows at different levels of the combined sewer system, and to estimate the contribution of runoff, waste water and sewer sediments to this pollution. Twenty-two rainfall events were studied from May to October 1996. Dry weather flow was monitored for one week. Roof, street and yard runoff, total flow at the catchment outlet and waste water were analysed for SS, VSS, COD and BOD5, on both total and dissolved fraction. Results show an evolution in the characteristics of wet weather flow from up to downstream: concentrations increase from the catchment entry to the outlet, as well as the proportion of particle-bound pollutants and the part of organic matter. A first evaluation of the different sources of pollution establishes that a major part of wet weather flow pollution originates from inside the combined sewer, probably through erosion of sewer sediments.

Increases in both HIV and syphilis among men who have sex with men in Vietnam: Urgent need for comprehensive responses

2021 ◽  
pp. 095646242110364
Author(s):  
Thuong V Nguyen ◽  
Hau P Tran ◽  
Nghia V Khuu ◽  
Phuc D Nguyen ◽  
Tu N Le ◽  
...  
Keyword(s):  
Sexual Debut ◽  
Temporal Trends ◽  
Consistent Condom ◽  
Test Results ◽  
Syphilis Infection ◽  
Early Sexual Debut ◽  
Sti Prevention ◽  
Factors Associated ◽  
Hiv Test ◽  
Sex With Men

The objective of this study was to determine the temporal trends and factors associated with HIV and syphilis infection among men who have sex with men (MSM) in southern Vietnam. Data from the 2014–2018 national HIV sentinel surveillance of MSM aged 16 years or older were collected from three provinces, including An Giang ( N = 761), Can Tho ( N = 900), and Ho Chi Minh City ( N = 1426), and examined for changes in prevalence rates of HIV and syphilis and risk behaviors over time. Multivariate logistic regression was performed to assess the trends and correlates of HIV and syphilis infections among MSM. There were upward trends for HIV (9.5% in 2014 to 14.2% in 2018, p-trend<0.01), syphilis (4.9% in 2014 to 8.0% 2018, p-trend<0.01), and HIV/syphilis co-infection (1.9% in 2014 to 3.1% in 2018, p-trend=0.01). Factors associated with HIV infection included place of residence, early sexual debut, consistent condom use and not engaging in anal sex during the past month, not knowing one’s HIV test results, having ever injected drugs, and having active syphilis. Additionally, early sexual debut and being HIV positive were associated with syphilis infection. Rising prevalences of these infections among MSM suggests an urgent need for comprehensive intervention packages for HIV/STI prevention.

A longitudinal analysis of sociodemographic and health correlates of sexual health among HIV-infected men in the USA

Sexual Health ◽  
2009 ◽  
Vol 6 (4) ◽  
pp. 285 ◽  
Author(s):  
William L. Jeffries ◽  
Barbara A. Zsembik ◽  
Chuck W. Peek ◽  
Constance R. Uphold
Keyword(s):  
Life Satisfaction ◽  
Sexual Health ◽  
Sexual Activity ◽  
Erectile Function ◽  
Temporal Changes ◽  
Depression Symptoms ◽  
Factors Associated ◽  
Sex Drive ◽  
The Usa ◽  
Over Time

Background: Sexual health among HIV-infected men primarily has been examined in cross-sectional designs. Few have used longitudinal data to measure sexual health change or factors associated with change. Moreover, studies of HIV-infected men disproportionately focus on sexual risk behaviours. The present paper examines temporal changes in sexual health based on measures of sexual activity, erectile function, sex drive, and sex life satisfaction. Methods: Data from a prospective cohort study of HIV-infected men (n = 197) in the USA were used. Sexual health measures were based on self-reported sexual activity, erectile function, sex drive, and sex life satisfaction at 12- and 24-month follow-ups. Transition matrices described 1-year sexual health changes. Logistic regression models determined sociodemographic and health-related factors associated with change. Results: Men reported considerable change in sexual health during the year-long observation interval. Among men who experienced change, younger age, cohabitation, and higher CD4 counts were associated with greater sexual activity over time. Men with more depression symptoms had lower erectile function over time, and higher education and higher income were protective against temporal declines in sex drive and satisfaction. Less disease comorbidity was associated with 1-year improvements in sex life satisfaction. Conclusions: Some men in our sample experienced sexual health change, but stability was common for most. Temporal changes in sexual health varied according to age, cohabitation, education, income, and physical and mental health covariates. The present paper highlights the benefits of longitudinal investigations and multidimensional definitions of sexual health.

scholarly journals 23 Science and the International Regulation of Marine Pollution

2015 ◽  
Author(s):  
Kirk Elizabeth A
Keyword(s):  
Decision Making ◽  
Historical Development ◽  
Final Section ◽  
Marine Pollution ◽  
Management Approach ◽  
International Regulation ◽  
Sources Of Pollution ◽  
Similarities And Differences ◽  
Different Sources

This chapter considers the approaches taken by international regimes to address marine pollution. It identifies similarities and differences in approaches across time and different sources of pollution, the degree to which they follow an adaptive management approach, and the role of science in decision-making. It begins with an overview of the historical development of the law. It then discusses the current regime, covering general obligations and certain source-specific obligations. The final section contains conclusions and a discussion of current and future issues.

scholarly journals Factors Associated with HIV prevalence among HIV-exposed Infants with HIV DNA Polymerase Chain Reaction Tests in Malawi: 2013-2020

2021 ◽  
Author(s):  
Wingston Ng'ambi ◽  
Janne Estill ◽  
Fatma Aziza Merzouki ◽  
Erol Orel ◽  
Tiwonge Chimpandule ◽  
...  
Keyword(s):  
Hiv Infection ◽  
Temporal Trends ◽  
Chain Reaction ◽  
Factors Associated ◽  
Hiv Dna ◽  
Polymerase Chain ◽  
Hiv Exposed ◽  
Spatial And Temporal Trends ◽  
Dna Pcr ◽  
Test Result

Background: Despite the high availability of individual-level data of infants accessing HIV DNA polymerase chain reaction (DNA-PCR) testing service, there has been little in-depth analysis of such data. Therefore, we describe spatial and temporal trends in risk of HIV infection among Malawi HIV-exposed infants (HEI) with DNA-PCR HIV test result from 2013 to 2020. Methods: This is an implementation study using routinely collected patient-level HIV DNA-PCR test result data extracted from the national Laboratory Management Information System database managed by the Department of HIV/AIDS between 1 January 2013 and 30 June 2020. We calculated frequencies, proportions and odds ratios (OR) with their associated 95% confidence intervals (95%CI). We performed a random-effects logistic regression to determine the risk factors associated with HIV infection in infants, controlling for the spatial autocorrelation between districts and adjusting for other variables. Results: We evaluated 255,229 HEI across 750 facilities in 28 districts. The overall risk of HIV infection among all tested HEI between 2013 and 2020 was 7.2% (95%CI: 7.1-7.3). We observed a decreasing trend in the proportion of HEI that tested HIV positive from 7.0% (95%CI: 6.6-7.4) in 2013 to 5.7% (95%CI: 5.4-5.9) in 2015 followed by an increase to 9.9% (95%CI: 9.6-10.2) in 2017 and then a decreasing trend to 4.2% (95%CI: 3.7-4.6) in 2020. The risk of HIV infection increased by age of the HEI. There was spatial heterogeneity of HIV prevalence between districts of Malawi. Conclusion: We summarised spatial and temporal trends of risk of HIV infection amongst HEI in Malawi between 2013 and 2020. There is need for further strengthening of EID program to ensure that all the HEI are enrolled in care by eight weeks of age in order to further reduce mother-to-child transmission of HIV.

Temporal trend and survival impact of infection source among patients with sepsis: a nationwide study

2020 ◽  
Vol 22 (2) ◽  
pp. 126-132
Author(s):  
Yueh-Sheng Chen ◽  
◽  
Tin-Yun Liao ◽  
Tzu-Chun Hsu ◽  
Wan-Ting Hsu ◽  
...  
Keyword(s):  
Mortality Rate ◽  
Tract Infection ◽  
Respiratory Tract ◽  
Lower Respiratory Tract ◽  
Temporal Trends ◽  
Administrative Database ◽  
Common Source ◽  
Sepsis Management ◽  
Incidence And Mortality ◽  
Different Sources

BACKGROUND: To determine the temporal trends of incidence and outcome based on different sources of sepsis using a nationwide administrative database. METHODS: From 2002 to 2012, the entire Taiwan's health insurance claims data of emergency-treated and hospital-treated sepsis were analysed for incidence and mortality trends. The information about patients with sepsis and sources of sepsis was identified using a set of validated International Classification of Diseases, ninth revision, clinical modification (ICD-9-CM) codes. The 30-day all-cause mortality was verified by linked death certificate database. RESULTS: A total of 1 259 578 episodes of sepsis were identified during the 11-year study period. Lower respiratory tract infection is the most common source of sepsis in patients, with the highest mortality rate. The incidence of genitourinary tract infection has the fastest growing rate. The sepsis mortality was declining at different rates for each source of sepsis. Co-infections in patients with sepsis are associated with higher mortality rate. CONCLUSION: The temporal trends of sepsis incidence and mortality varied among different sources of sepsis, with lower respiratory tract being the highest burden among patients with sepsis. Furthermore, sources of sepsis and the presence of co-infection are independent predictors of mortality. Our results support source-specific preventive and treatment strategies for future sepsis management.

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