bluuebunny/crossref_metadata_2025_split huggingface dataset:
Accumulation and Translocation of Toxic Elements From Contaminated Soils, Nigeria: Implications for Phytomining and Hazards to Humans
Authors: Ameh Eneojo G , Kolawole Samuel M , Idakwo Sunday O , Ojonimi Ile O 
Published: February 2021

Abstract
Soil pollution by heavy metals and their health effect on human are pressing issues of the environment caused by human activities. Plant’s accumulation and translocation potentials were investigated to determine their suitability for phytoremedial purposes, their ability to serve as reservoir for recovery of additional economic amount of metals and the potential of the edibles/vegetables to cause harm to humans when consumed. The plant and soil samples were collected, prepared, digested in acid mixture of H2O2 and HNO3 for plants and Li2B4O7 - LiBO2 for soils and were analysed. The analyses were carried out to determine the concentration of these metals in soil, their accumulation and translocation in plant parts. The data acquired were evaluated using bioconcentration (BCF), translocation factor (TF), bioaccumulation coefficient (BAC), metal uptake efficiency (ME%) and hierarchical cluster analysis to determine hyperaccumulators, phytoextractors, phytostabilizers, metal source plants and metals that could be toxic to humans through intake of roots, grains/seeds, fruits and leaves as vegetables. ANOVA analysis revealed that the data were significant at p <0.05. Correlation and cluster analyses were employed to understand the relationships between variables determined. From this study, CA, COA and LA were hyperaccumulators of Co at various points. Arsenic has only phytostabilizers. COA and LA were phytostabilizers of Cd while Sida acuta was the only phytoextractor. Chromium, Co and Cd have prospect of being phytomined from some of the plants. Vegetables/edibles values in shoots and leaves were above permissible levels for Cr, Co and Cd. The metal uptake efficacy (%) were in this order Co (28.99 to 89.08) > Cd (21.74 to 50.96) >Cr (22.90 to 49.06) > and As (9.65 to 39.19).
Gradual increases in dyslipidemia among male patients with human immunodeficiency virus primarily treated with tenofovir plus lamivudine plus efavirenz: a 3-year follow-up study
Authors: liu dafeng , ZHANG Xingyi , Kang Jun , Gao Fengjiao , He Yinsheng , He Shenghua 
Published: February 2021

Abstract
Introduction: Since the development of antiretroviral therapy (ART) with TDF plus 3TC plus EFV, this specific regimen has not been studied enough with long-term lipid and uric monitoring.Methods: A prospective follow-up cohort study was performed. Sixty-one treatment-naive male patients with HIV were divided into three groups based on their baseline CD4+ T cell count (26, 12, and 23 patients in the <200, 200 to 350, and >350 groups, respectively). The lipid and purine metabolism parameters of the patients over 144 weeks were analyzed.Result: TG, TC, LDL-c and HDL-c levels all gradually increased over 144 weeks, but the increases in TC levels and HDL-c levels were significant (P=0.001, 0.000, respectively). Moreover, the percentages of hypercholesterolemia, hyper LDL cholesterolemia and hypertriglyceridemia all showed gradual and nonsignificant increases; the percentage of low HDL cholesterolemia showed a gradual and significant decrease (P=0.0007). Furthermore, the lower the baseline CD4+ T lymphocyte counts were, the higher the TG levels were and the lower the TC, LDL-c and HDL-c levels were. However, only baseline LDL-c levels differed significantly between the three groups (P=0.0457). Although the UA level and the percentages of hyperuricemia gradually increased over 144 weeks, there was no significant difference between the different follow-up time point groups or between the three CD4+ T cell count groups (all P>0.05). Further analyses revealed that the main factors contributing to lipid metabolism were age, anthropometric parameters and follow-up weeks, and virus load was the main factor contributing to uric acid levels.Conclusions: These findings provide a reference for clinicians to monitor lipid metabolism parameters closely during long-term ART with the TDF plus 3TC plus EFV regimen.
New stability criteria for stochastic perturbed singular
systems in mean square
Authors: Caraballo Thomas , Ezzine Faten , Hammami Mohamed ali 
Published: February 2021

Abstract
In this paper, we investigate the problem of stability of time-varying stochastic perturbed singular systems by using Lyapunov techniques under the assumption that the initial con- ditions are consistent. Sucient conditions on uniform exponential stability and practical uniform exponential stability in mean square of solutions of stochastic perturbed singular systems are obtained based upon Lyapunov techniques. Furthermore, we study the prob- lem of stability and stabilization of some classes of stochastic singular systems. Eventually, we provide a numerical example to validate the e ectiveness of the abstract results of this paper.
Impact of polymer blending on Ionic Conduction Mechanism and Dielectric Properties of Sodium based PEO-PVdF Solid Polymer Electrolyte Systems
Authors: Mallaiah Yalla , JEEDI VENKATA RAMANA , Swarnalatha R. , Raju A. , Reddy S. Narender , A SADANANDA CHARY 
Published: February 2021

Abstract
Solid polymer blend electrolyte systems have been prepared with Poly (ethylene oxide) (PEO), Poly (Vinylidene fluoride) (PVDF) and complexed with Sodium Nitrate (NaNO 3 ) salt by using solution cast technique. The complexion of salt with polymer blend has been confirmed by X-Ray diffraction, Fourier Transmission Infrared Spectroscopy and scanning electron microscopic studies. AC and DC conductivity studies of these polymer blends were carried out by changing the weight percentages of PEO and PVDF with a constant weight percentage of NaNO 3 . The electric modulus (M ' ) and the dielectric properties for all the polymer blend systems have been investigated with impedance spectroscopic analysis as a function of frequency ranging from 100- 30MHz. The ionic conductivity of the blend polymer electrolyte systems followed Arrhenius behaviour and the maximum ionic conductivity was observed for PEO:PVdF:NaNO 3 (80:20:5) at room temperature which is attributed to the formation of the amorphous phase.
The Reliability and Validity of Turkish Version of The School-Based Asthma and Allergy Screening Questionnaires
Authors: KILIC Mahmut , Ede Ghaniya , Uzuncakmak Tugba 
Published: February 2021

Abstract
Background: Asthma is an important public health problem affecting children, causing school absenteeism and hospitalization. The aim of this study is to assess the validity and reliability for diagnostic accuracy of the Turkish version of the asthma and allergy screening questionnaire.Methods: This study included primary and secondary school students from grades 2 to 7, and their parents or caregivers. For validity, 40 children with asthma and 39 children with allergy diagnosed by the questionnaire were used to determine the sensitivity, and specificity was calculated by using the data of 100 children without asthma and allergies. For reliability, the Spearman correlation was used for dependent groups, for validity, the Receiver Operating Characteristic (ROC) analysis was used. Results: When the questionnaire cut-off point was 2/3 for asthma, according to the student and parent form, the sensitivity was 80.0% and 82.5%, and the specificity was 56.6% and 76.8%, respectively. When the questionnaire cut-off point was 0/1 for allergies, according to the student and parent questionnaire, the sensitivity was 74.4% and 84.6%, and the specificity was 66.3% and 54.2%, respectively. The reliability of the asthma and allergy questionnaires test-retest correlation values (≥0.68) of both questionnaires were found to be statistically significant. Conclusion: According to the Turkish questionnaire of the students and their parents, questionnaire sensitivity for asthma and allergy was similar in proportion to the original questionnaire. The Turkish version of the questionnaire can be used for asthma and allergy screening in schools.
Evaluation of the Virtual Learning Environment by School Children and Their Parents in Saudi Arabia during the COVID-19 Pandemic After School Closure
Authors: Hegazi Moustafa Abdelaal , Butt Nadeem S , Sayed Mohamed H , Zubairi Nadeem A , Alahmadi Turki S , El-Baz Mohamed S , Atwah Ali F , Atuwiriqi Mohammad A , Saeedi Fajr A , Abdulhaq Nada M , Almurashi Saleh H 
Published: February 2021

Abstract
Background: No previous studies have involved school children or their parents in the evaluation of virtual learning environment (VLE). Thus, this survey was performed to develop a novel questionnaire which was then used to evaluate the satisfaction of school children and their parents with the VLE in the Kingdom of Saudi Arabia during the COVID-19 pandemic.Methods: A cross-sectional survey utilizing a validated and reliable questionnaire was distributed online for VLE evaluation. A median value >3 indicated participant satisfaction in each of the 5 domains of the questionnaire as well as overall VLE satisfaction. Results: Six hundred and ninety three participants including 571 Saudi citizens and 122 non-Saudi residents participated in this survey. The number of school children who agreed or strongly agreed were significantly lower than the number of children who disagreed or strongly disagreed with preferring the VLE over traditional education (p<0.001). The participants evaluated the VLE experience as unsatisfactory with a median value ≤3 for 4 out of 5 questionnaire domains with an overall satisfaction value of 2.8. Among the 117 participants who gave further written opinions/comments, 42(35.9%) participants supported the VLE as an alternative to traditional classrooms, if equipment and internet are made available and for the safety of their children.Conclusions: This is the first powerful population study, both globally and nationally, to utilize a novel validated and reliable questionnaire for exploring VLE satisfaction. This study showed the participants’ unsatisfactory VLE experience. The VLE is accepted as an alternative to traditional classrooms to keep up with learning and to maintain the safety of children and it can be a supplementary learning method but many measures are still needed to develop the VLE.
Feasibility of a Pilot Randomized Hypertension Screening Initiative in the Preoperative Setting.
Authors: Diaz Sofia , Yan Luying , Dai Feng , Zhou Bin , Burg Matthew M. , Schonberger Robert B. 
Published: February 2021

Abstract
Objectives: This pilot study sought to assess feasibility of a randomized trial of blood pressure intervention (home blood pressure monitoring vs counseling) in the preoperative clinic and the baseline rates of primary care follow-up after such interventions.Methods: A prospective randomized pilot study was performed at Yale New Haven Hospital Preadmission Testing Clinic. A sample of 100 adults with elevated blood pressure, were recruited during their preadmission visit, and randomized 1:1 to receive brief BP counseling and an educational brochure versus additionally receiving a home BP monitor (HBPM) with a mailed report of their home readings. At 60-day post-surgery telephone follow-up, investigators asked whether participants had primary-care follow-up; had new/adjusted hypertension treatment and felt satisfied with the study.Results: There were 51 patients in the counseling group and 49 in the HBPM group. Of 46 patients in the HBPM group who returned their monitors, 36 (78%) were hypertensive at home. At 60 days post-surgery, 31 (61%) patients in the counseling group and 30 (61%) in the HBPM group were reached by telephone with the remaining followed by EMR. 36 (71%) patients in the counseling group and 36 (73%) in the HBPM group had seen their Primary Care provider. 17 of 36 (47%) in the counseling group and 18 of 31 (58%) in the HBPM group received new or adjusted hypertension medications. 61 participants answered questions regarding their satisfaction with the study with 52 (85%) reporting that they felt moderately to very satisfied. Conclusions: This pilot study suggests that interventional blood pressure trials in the preoperative clinic are feasible, but telephone follow-up leads to significant gaps in outcome ascertainment. Trial Registration: Clinicaltrials.gov, NCT03634813. Registered 16 of August 2018, https://clinicaltrials.gov/ct2/show/NCT03634813
The Impact of Infectious Diseases Consultation on the Management and Outcomes of Pseudomonas aeruginosa Bacteraemia in Adults: A Retrospective Cohort Study.
Authors: Chiong Fabian , Wasef Mohammed S , Liew Kwee Chin , Cowan Raquel , Tsai Danny , Lee Yin Peng , Croft Larry , Harris Owen , Gwini Stella May , Athan Eugene 
Published: February 2021

Abstract
Background: Pseudomonas aeruginosa bacteraemia (PAB) is associated with high mortality. The benefits of infectious diseases consultation (IDC) has been demonstrated in Staphylococcal aureus bacteraemia and other complex infections. Impact of IDC in PAB is unclear. This study aimed to evaluate the impact of IDC on the management and outcomes in patients with PAB.Methods: This is a retrospective cohort single-centre study from 1 November 2006 to 29 May 2019, in all adult patients admitted with first episode of PAB. Data collected included demographics, clinical management and outcomes for PAB and whether IDC occurred. In addition, 29 Pseudomonas aeruginosa (PA) stored isolates were available for Illumina whole genome sequencing to investigate if pathogen factors contributed to the mortality. Results: A total of 128 cases of PAB were identified, 71% received IDC. Patients who received IDC were less likely to receive inappropriate duration of antibiotic therapy (4.4% vs 67.6%; p<0.01), more likely to be de-escalated to oral antibiotic in a timely manner (87.9% vs 40.5%; p<0.01), undergo removal of infected catheter (27.5% vs 13.5%; p=0.049) and undergo surgical intervention (20.9% vs 5.4%, p=0.023) for source control. The overall 30-day all-cause mortality rate was 24.2% and was significantly higher in the no IDC group in both unadjusted (56.8% vs 11.0%, odds ratio [OR]=10.63, p<0.001) and adjusted analysis (adjusted OR=7.42; 95% confidence interval, 2.51-21.93 ). The genotypic analysis did not reveal any PA genetic features associated with increased mortality between IDC versus no IDC groups. Conclusion: Patients who received IDC for PAB had lower 30-day mortality, better source control and management was more compliant with guidelines. Further prospective studies are necessary to determine if these results can be validated in other settings.
Pattern of practice on mental health issues and attitude towards referral among general medical practitioners of North India
Authors: Mishra Sudha , Kar Sujita Kumar 
Published: February 2021

Abstract
Background: Still, in a larger part of the world, people with mental illnesses first consult general practitioners (non-psychiatrist practitioners) to treat their mental illness. Many such patients seek psychiatric consultation with reluctance after being referred by general practitioners due to stigma. The study aimed to assess the attitude of general medical practitioners towards consultation-liaison psychiatric services.Methods: In this cross-sectional survey, a total of 61 general medical practitioners, specialists, and subspecialist physicians, surgeons from a city of North India were evaluated in a questionnaire which was designed based on previous studies and observations to assess their attitudes towards liaison psychiatric services.Findings: Nearly 98% of the general practitioners deal with the patient of psychiatric illness, out of which nearly 30% treat the patient of their own. Nearly 88% of practitioners referring a patient to psychiatrists. More than 90% of general practitioners reported psychiatric problems are associated with medical illness. More than 40%prescribe psychotropic medication, out of which benzodiazepine is the most commonly prescribed one. Depression is commonly encountered in general medical practice. More than 70% of practitioners are not comfortable prescribing psychotropic medications. About 16.39% of general practitioners faced difficulty in referring patients to a psychiatrist for various reasons. Conclusion: General practitioners treat many patients with psychiatric illness though they are not comfortable prescribing psychotropic medications.
Institutional characteristics of a geographic digital divide bridging national programs and mechanisms
Authors: Шарифьянов Т.Ф. 
Published: February 2021

Объектом статьи является инфраструктура информационного доступа (широкополосный), а предметом – механизм ее диффузии на периферийные территории региона. Рассмотрены государственные практики ряда правительств, направленные на сокращение географического цифрового неравенства. Все множество практик рассмотрено со стороны их институциональных и проектных характеристик. В контексте прикладных задач региональной экономики, т.е. развития связующей центр-периферийной инфраструктуры, практики сгруппированы в двух ключевых измерениях – в разрезе звеньев цепочки формирования информационного доступа и в последовательности снижения сил рыночных, смешанных и государственных институтов при движении от центра к периферии региона.
Предложен общий синтетический механизм диффузии инфраструктуры от центра к периферии региона и его промежуточная версия для совершенствования действующего в России механизма сокращения географического цифрового неравенства. Приведены некоторые оценки преимущества нового механизма.
The information access infrastructure (broadband internet) is the object of this paper and the mechanism of the infrastructure diffusion to the peripheral territories its subject. The government’s practices aimed to bridge the geographical digital divide are considered. All of observed practices considered in terms of their institutional and design characteristics. In the context of applied regional tasks i.e. the development of a connecting center-peripheral infrastructure, practices are grouped in two key dimension – in terms of links in the information supply chain and in the sequence of market, mixed and state institutions forces reduction during the direction from the center to the periphery of the region.
A general synthetic mechanism of the central-periphery infrastructure diffusion and its intermediate version for improving the existing Russian mechanism are proposed. Some assessments of the advantages of the new mechanism listed in the article.
The role of predicted cost assessment during pilot production, result application and their management in the economic system of aircraft engine companies
Authors: Смоляков О.А. 
Published: February 2021

В статье рассмотрены проблемные вопросы прогнозирования затрат при опытном производстве, которые неразрывно связаны с выполнением работ в рамках стадии – разработка, жизненного цикла перспективного авиационного двигателя. В процессе данной стадии разрабатываются технологии, которые в последующем внедряются в производство. Отмечено, что, при оценке технико-экономической эффективности, в части затрат, следует особое внимание обратить на опытное производство, как узлов (компонентов), так и перспективного авиационного двигателя в целом.
The article deals with the problematic issues of forecasting costs in pilot production, which are inextricably linked with the performance of work within the stage - development, the life cycle of a promising aircraft engine. In the process of this stage, technologies are developed, which are subsequently introduced into production. It is noted that, when assessing the technical and economic effect, in terms of costs, special attention should be paid to the pilot production of both units (components) and the promising object as a whole.
Development of the digital economy in Russian society and its impact on state and regional regulation
Authors: Карташов К.А. , Демьянченко Н.В. , Овчаренко Н.А. , Сотская Т.В. 
Published: February 2021

В статье приводится исторический ракурс теории в области цифровизации общества и систематизированы различные подходы к определению цифровой экономики. Раскрывается роль цифровой экономики в современной рыночной конкурентной среде и представлена авторская визуализация структуры взаимоотношений в цифровизации общества. Представлены преимущества интеграции цифровой экономики в жизнедеятельность общества и основные проблемы, риски цифровизации в стране и регионе. В заключении статьи авторами даются краткие выводы и рекомендации.
The article provides a historical perspective of the theory in the field of digitalization of society and systematizes various approaches to the definition of the digital economy. The role of the digital economy in the modern competitive market environment is revealed and the author's visualization of the structure of relationships in the digitalization of society is presented. The advantages of integrating the digital economy into the life of society and the main problems and risks of digitalization in the country and region are presented. In conclusion, the authors give brief conclusions and recommendations.
Relationship of the physical, mechanical and technological properties of binary alloys with qualitative changes in the crystallization intervals
Authors: Михайлов А.В. , Шахназаров К.Ю. 
Published: February 2021

На основании анализа литературных данных по физико-механическим и технологическим свойствам двойных сплавов в представленной статье сделана попытка дать представление о диаграмме состояния как о концентрационной зависимости качественных изменений интервалов кристаллизации (перекристаллизации).
Это впервые позволяет связать с диаграммой состояния, не поддающиеся объяснению особенностями фазового состава или структуры аномалии физико-механических и технологических свойств используемых промышленно двойных сплавов.
Based on the analysis of literature data on the physicomechanical and technological properties of binary alloys, this article attempts to give an idea of the phase diagram as a concentration dependence of qualitative changes in the crystallization (recrystallization) intervals.
For the first time, this makes it possible to associate with the phase diagram the anomalies of the physicomechanical and technological properties of the industrially used binary alloys that cannot be explained by the peculiarities of the phase composition or structure.
Analysis of dynamic response law and time-frequency characteristics of high cut slope under the action of earthquake
Authors: Jin Honghua , Wang Linfeng , Ren Qingyang , Zhang Xingxing 
Published: February 2021

This study aimed to reveal the dynamic response law and time-frequency characteristics of the slope under the action of earthquake. Based on an actual project in earthquake area, the stability of the slope under natural and seismic conditions was calculated and the meso parameters of rock and soil were obtained by indoor rock and soil specimen parameter test firstly. Meanwhile, a three-dimensional particle flow model of the high-cut slope was established by the three-dimensional particle flow software PFC3D. Then, the law of dynamic response of the slope acceleration was obtained by inputting the horizontal wave of 2008 Wenchuan earthquake. Furthermore, MATLAB programming was used to analyze the time-history signal of acceleration of the slope, and finally the time-frequency characteristics of the high cut slope under the action of earthquake were studied. The results show that the dynamic response characteristics of soil particles in horizontal and vertical directions show surface-tending effect and elevation amplification effect respectively under the action of earthquake. The analysis of time-frequency characteristics showed that the Fourier dominant frequency of soil particles is distributed between 0-5 Hz under the action of earthquake, the low frequency band (0-15.625 Hz) accounts for as high as 88.07 %, and the high frequency band (125-250 Hz) accounts for as low as 0.34 %.