The impact of Pleurotus ostreatus on organic matter transformation processes

2012 ◽  
Vol 66 (12) ◽  
pp. 2666-2673 ◽  
Author(s):  
Izabella Pisarek ◽  
Mariusz Głowacki ◽  
Małgorzata Czernia
Keyword(s):  
Organic Matter ◽  
Humic Substances ◽  
Pleurotus Ostreatus ◽  
Negative Impact ◽  
Correlation Coefficients ◽  
Organic Soil ◽  
Organic Complexes ◽  
Study Results ◽  
The Impact ◽  
Transformation Processes

This study showed the effect of Pleurotus ostreatus on the external organic matter (OM) transformation processes. The kinetics of these changes were determined. The experiment was conducted as 42-day pot experiment done in four combinations (with four replications). The four combinations of different substrates were: (1) organic, (2) composted hay, (3) organic soil + composted hay, (4) organic soil + composted hay + lead. The study results showed that P. ostreatus had the ability to transform external OM as well as metal–organic complexes. These transformations were reflected in the constant rate of characterized changes and correlation coefficients. The study also indicated the direction of the external OM transformation. The direction leads to the selective oxidation of aliphatic structures, and an increase in humic substances which are resistant to oxidation. The study also identified the negative impact of lead on the ability of P. ostreatus to transform humic substances. The impact of lead was expressed as the lower value of the rapid rate constant k1 in objects enriched with lead acetate.

scholarly journals Differences in soil organic matter and humus of sandy soil after application of biochar substrates and combination of biochar substrates with mineral fertilizers

2020 ◽  
Vol 23 (3) ◽  
pp. 117-124
Author(s):  
Dušan Šrank ◽  
Vladimír Šimanský
Keyword(s):  
Organic Matter ◽  
Soil Organic Matter ◽  
Carbon Content ◽  
Humic Substances ◽  
Sandy Soil ◽  
The Other ◽  
Mineral Fertilizers ◽  
Other Hand ◽  
Sheep Manure ◽  
The Impact

The effort to achieve the sustainable farming system in arable soil led to the intensive search for a new solution but an inspiration can also be found in the application of traditional methods of soil fertility improvement as it is shown in numerous examples in history. Recently many scientific teams have focused their attention on the evaluation of biochar effects on soil properties and crop yields. Since there are a lot of knowledge gaps, especially in explanations how biochar can affect soil organic matter (SOM) and humus substances, we aimed this study at the solution of these questions. Therefore, the objective of the experiment was to evaluate the impact of two biochar substrates (B1 – biochar blended with sheep manure, and B2 – biochar blended with sheep manure and the residue from the biogas station) at two rates (10 and 20 t ha-1) applied alone or in combination with mineral fertilizers (Urea was applied in 2018, at rate 100 kg ha-1, and Urea at rate 100 kg ha-1 + AMOFOS NP 12-52 at 100 kg ha-1 were applied in 2019) on the quantity and quality of SOM and humus of sandy soil (Arenosol, Dolná Streda, Slovakia). The results showed that application of the biochar substrates together with mineral fertilizers (MF) had more pronounced effect on the organic matter mineralization in the sandy soil which resulted in low accumulation of soil organic carbon (Corg) and labile carbon compared to biochar substrates treatments without MF. The share of humic substances in Corg significantly decreased by 16, 50, 16 and 24% in B1 at 10 t ha-1, B1 at 20 t ha-1, B2 at 10 t ha-1 and B2 at 20 t ha-1 treatments, respectively, compared to the control. A similar tendency was observed for biochar substrates treatments + MF, compared to MF control. The carbon content of humic substances (CHS) was equal to 4.40 – 5.80 g kg-1 and the biochar substrates had statistically significant influence on CHS content. On average, there was a smaller decrease of CHS in B1 at rate 10 t ha-1 than at rate 20 t ha-1 and no effect of B2 compared to control. The carbon content of fulvic acid (CFA) was 9% higher in B1 at 10 t ha-1, and 20 t ha-1, 47% higher in B2 at 10 t ha-1 and 17% higher in B2 at 20 t ha-1 compared to control. As a result of biochar substrates + MF application, the reduction in CFA was observed. The results showed a decrease of CHA : CFA ratio with association to biochar substrates alone application compared to control on one hand, and a wider of CHA : CFA ratio in biochar substrates + MF treatments in comparison to MF control on the other hand. Humus stability was increased in biochar substrates alone treatments compared to control, on the other hand, compared to MF control, the application of biochar substrates + MF resulted in a lower humus stability.

scholarly journals An empirical investigation of workplace factors affecting lean performance

2018 ◽  
Vol 67 (2) ◽  
pp. 278-296 ◽  
Author(s):  
Ilias Vlachos ◽  
Evangelia Siachou
Keyword(s):  
Organizational Culture ◽  
Knowledge Acquisition ◽  
Continuous Improvement ◽  
Negative Impact ◽  
Hierarchical Regression ◽  
Content Type ◽  
Factors Affecting ◽  
Study Results ◽  
Workplace Factors ◽  
The Impact

Purpose The purpose of this paper is to identify workplace factors with an impact on lean performance (LP). This can lead to better LP outcomes, thus facilitating organizations to smoothly move from the conventional to lean management. Design/methodology/approach The direct effects of training, knowledge acquisition and organizational culture are empirically investigated using data from 126 managers employed at a global company, which recently has improved its LP. Study’s hypotheses were analyzed with hierarchical regression models. Findings The findings suggest that not all of the aforementioned workplace factors holistically affect LP. Only organizational culture is associated to the four LP variables (i.e. continuous improvement, waste, ergonomy and product quality). Training and knowledge acquisition offer partially effects on LP with training to contribute mostly to predicting continuous improvements. Knowledge acquisition alone, has significant yet negative impact on both continuous improvement and ergonomy. Even more, when training is combined with knowledge acquisition the results are different. Originality/value As this study highlights the impact of workplace practices on LP, attributes mainly importance to the distinct effects that each of the aforementioned factors has on the four distinct LP variables. Although the study results reflect a particular case, its recommendations could facilitate practitioners to achieve better lean outcomes.

scholarly journals Role of humic substances as refractory organic matter in sustainable water quality assessment and management

2019 ◽  
Vol 20 (2) ◽  
pp. 538-549
Author(s):  
Maoqing Duan ◽  
Xia Du ◽  
Wenqi Peng ◽  
Cuiling Jiang ◽  
Shijie Zhang
Keyword(s):  
Water Quality ◽  
Chemical Oxygen Demand ◽  
Humic Substances ◽  
River Water ◽  
Anthropogenic Activities ◽  
Water Quality Management ◽  
National Development ◽  
Oxygen Demand ◽  
Study Results ◽  
The Impact

Abstract In northern China, river water originating from or flowing through forests often contains large amounts of oxygen-consuming organic substances, mainly humic substances. These substances are stable and not easily biodegradable, resulting in very high detection values of chemical oxygen demand. However, under natural conditions, the dissolved oxygen demand is not as high. Using experimental values to evaluate river water quality and the impact of human activities on water quality is thus unscientific and does not meet national development goals. In this study, the potential sources of high-concentration chemical oxygen demand in river water in two areas exposed to virtually no anthropogenic activities and strongly affected by humic substances, were analysed. The chemical oxygen demand contributed by humic substances (COD-HSs) was quantified using three methods. The results of water quality monitoring in 2017 and 2018 revealed that the chemical oxygen demand concentrations (5–44 mg/L) predominantly exceeded the standard (15 mg/L). The study results suggest that COD-HSs should be considered separately for objective evaluation and management of water quality, particularly in areas that are seriously affected by COD-HSs, to provide a scientific basis for formulating sustainable water quality management policies.

scholarly journals Impact of malocclusion on the quality of life of children aged 8 to 10 years

2018 ◽  
Vol 23 (2) ◽  
pp. 46-53 ◽  
Author(s):  
Sônia Rodrigues Dutra ◽  
Henrique Pretti ◽  
Milene Torres Martins ◽  
Cristiane Baccin Bendo ◽  
Miriam Pimenta Vale
Keyword(s):  
Quality Of Life ◽  
Negative Impact ◽  
Cross Sectional Study ◽  
Cross Sectional ◽  
Significance Level ◽  
Normal Occlusion ◽  
Study Results ◽  
Belo Horizonte ◽  
The Impact

ABSTRACT Objective: The aim of the present cross-sectional study was to assess the impact of malocclusion on the quality of life of children aged 8 to 10 years attending public elementary schools in Belo Horizonte, State of Minas Gerais, Brazil. Methods: The Brazilian version of the Child Perceptions Questionnaire 8-10 (CPQ8-10) was used to evaluate oral health-related quality of life. The children were examined for the diagnosis of malocclusion using the Dental Aesthetic Index (DAI). The data were analyzed by bivariate and multivariate descriptive statistics using Poisson regression at a 5% significance level. A total of 270 children participated in the study. Results: Children with normal occlusion or mild malocclusion (DAI ≤ 25) were 56% less likely (95%CI: 0.258-0.758; p= 0.003) to have their quality of life affected compared with children diagnosed with extremely severe malocclusion (DAI ≥ 36). Children with a maxillary anterior overjet ≥ 3 mm had higher CPQ8-10 mean scores (19.4; SD = 17.1) than those with an overjet < 3 mm (13.6; SD = 11.7; p= 0.038). Conclusions: Extremely severe malocclusion and pronounced maxillary anterior overjet were associated with a negative impact on quality of life.

The Impact of Marijuana Legalization on Law Enforcement in States Surrounding Colorado

2018 ◽  
Vol 22 (2) ◽  
pp. 217-242 ◽  
Author(s):  
Kyle C. Ward ◽  
Paul A. Lucas ◽  
Alexandra Murphy
Keyword(s):  
Law Enforcement ◽  
Survey Methodology ◽  
Negative Impact ◽  
Law Enforcement Officers ◽  
Cluster Sampling ◽  
Marijuana Legalization ◽  
Study Results ◽  
Personal Perceptions ◽  
Recreational Marijuana ◽  
The Impact

Since the legalization of recreational marijuana occurred in Colorado, politicians, academics, and the public have been paying close attention to what impact, if any, the legalization of recreational marijuana has on crime, substance use and abuse, and state revenue gains. However, research has not identified the potential impact that marijuana legalization has had on law enforcement officers in neighboring states. This study used survey methodology to explore how the legalization of recreational marijuana in Colorado has affected law enforcement officers and their duties in states that border Colorado. Using multistage cluster sampling, municipal police departments and sheriff’s offices in Kansas, Nebraska, and Wyoming were selected for inclusion in this study based off their proximity to Colorado and because none had legalized either medical or recreational marijuana at the time of this study. Results indicate that law enforcement officers view Colorado’s legalization of recreational marijuana as having a negative impact on their enforcement duties. Respondents note an increase in potency, perceived juvenile use, and strain on their resources as major issues they are now having to deal with. Analysis indicates that departments further away from Colorado perceive less of an impact than counties closer to Colorado’s border. Compared with Nebraska and Kansas, respondents from Wyoming perceived a larger impact on enforcement, but these differences were diminished when controlling for personal perceptions of marijuana.

scholarly journals Interrelationship between Sleep and Exercise: A Systematic Review

2017 ◽  
Vol 2017 ◽  
pp. 1-14 ◽  
Author(s):  
Brett A. Dolezal ◽  
Eric V. Neufeld ◽  
David M. Boland ◽  
Jennifer L. Martin ◽  
Christopher B. Cooper
Keyword(s):  
Sports Medicine ◽  
Exercise Intervention ◽  
Negative Impact ◽  
Sleep Study ◽  
Exercise Interventions ◽  
Positive Effects ◽  
Study Results ◽  
Intensity Of Exercise ◽  
The Impact ◽  
The Relationship

Although a substantial body of literature has explored the relationship between sleep and exercise, comprehensive reviews and definitive conclusions about the impact of exercise interventions on sleep are lacking. Electronic databases were searched for articles published between January 2013 and March 2017. Studies were included if they possessed either objective or subjective measures of sleep and an exercise intervention that followed the guidelines recommended by the American College of Sports Medicine. Thirty-four studies met these inclusion criteria. Twenty-nine studies concluded that exercise improved sleep quality or duration; however, four found no difference and one reported a negative impact of exercise on sleep. Study results varied most significantly due to participants’ age, health status, and the mode and intensity of exercise intervention. Mixed findings were reported for children, adolescents, and young adults. Interventions conducted with middle-aged and elderly adults reported more robust results. In these cases, exercise promoted increased sleep efficiency and duration regardless of the mode and intensity of activity, especially in populations suffering from disease. Our review suggests that sleep and exercise exert substantial positive effects on one another; however, to reach a true consensus, the mechanisms behind these observations must first be elucidated.

The impact of interactions between algal organic matter and humic substances on coagulation

2015 ◽  
Vol 84 ◽  
pp. 278-285 ◽  
Author(s):  
Martin Pivokonsky ◽  
Jana Naceradska ◽  
Tomas Brabenec ◽  
Katerina Novotna ◽  
Magdalena Baresova ◽  
...  
Keyword(s):  
Organic Matter ◽  
Humic Substances ◽  
Algal Organic Matter ◽  
The Impact

scholarly journals 596 Redeployment of Surgical Trainees to Intensive Care During the COVID-19 Pandemic: Evaluation of the Impact on Training and Wellbeing

2021 ◽  
Vol 108 (Supplement_6) ◽  
Author(s):  
A Payne ◽  
M Alfa-Wali ◽  
R Rahman ◽  
R Bullingham ◽  
S Vamadeva
Keyword(s):  
Intensive Care ◽  
Negative Impact ◽  
Clinical Skills ◽  
Workforce Planning ◽  
Survey Study ◽  
Nontechnical Skills ◽  
Surgical Trainees ◽  
Study Results ◽  
Peripheral Arterial ◽  
The Impact

Abstract Aim The aim of this study was to evaluate the impact of redeployment of surgical trainees to intensive care units (ICUs) during the COVID-19 pandemic in terms of transferrable technical and nontechnical skills and wellbeing. Method This was a survey study consisting of a 23-point questionnaire. The study involved senior house officer level surgical trainees that had been redeployed to the (ICU) across all hospitals in London during the COVID-19 pandemic. The survey was sent to 90 surgical trainees. Thirty-two trainees responded to the questionnaire and were included in the study results. Results All respondents spent between 4 and 8 weeks working in ICU. Prior to redeployment, 78% of participants had previous experience of ICU or an affiliated specialty, and &gt;90% had attended at least 1 educational course with relevance to ICU. There were statistically significant increases in confidence performing central venous cannulation and peripheral arterial catheterisation (p &lt; 0.05). With regards to clinical skills, respondents reported feeling more confident managing ventilated patients, patients on noninvasive ventilation, dialysis, and circulatory failure patients after working in ICU. Respondents (97%) felt that the experience would be beneficial to their future careers but 53% felt the redeployment had a negative impact on their mental health. Conclusions Redeployment of surgical trainees to ICU led to increased confidence in a number of technical and nontechnical skills. However, proactive interventions are needed for training surgeons with regard to their psychological wellbeing in these extraordinary circumstances and to improve workforce planning for future pandemics.

scholarly journals Corporate Governance and Financial Performance of Money Deposit Banks in Nigeria

2021 ◽  
Vol 7 (1) ◽  
pp. 75-98
Author(s):  
Bilqis Bolanle Amole ◽  
Ik Muo ◽  
Kamaldeen A. Lawal
Keyword(s):  
Corporate Governance ◽  
Financial Performance ◽  
Board Of Directors ◽  
Audit Committee ◽  
Negative Impact ◽  
Secondary Data ◽  
Least Square ◽  
Executive Directors ◽  
Study Results ◽  
The Impact

Purpose. The main cause of distress in the majority of Nigerian banks is poor corporate governance in the country. Corporate governance (CG) is a contemporary subject attracting the consideration of the corporate world, practitioners, consultants, academia and society at large. As a result, this study explores the financial performance (FP) of money deposit banks (MDBs) in Nigeria as a result of corporate governance put in. It went on to investigate the impact of board size and composition, as well as the audit committee, on bank financial performance. Methodology. A descriptive design method was adopted, while secondary data in the form of yearly financial reports of banks selected for the study were obtained and relevant documents via electronic search of databases. Descriptive statistics were used in analyzing the data and an econometric model of panel least square (PLS) regression test was employed for the study. Findings and Implication. The findings affirmed that the correlation between size of board of directors and bank performance was significant, however negative. The results of the study show that the board of directors (BOD) composition significantly influences the FP of MDBs. The study results further reveal that the correlation between size of the audit committee (AC) and FP of MDBs is significant and also a negative one. As a result, based on the empirical findings of the study, it is concluded that CG has a statistically significant influence on the FP of Nigeria’s listed money deposit banks. Mechanisms such as the large size and composition of the board as well as the size of the audit committee encourage a negative impact on the FP. In line with the foregoing, the study recommended that an effort be made to improve CG, in the sense that the number of directors on board should be kept to a desirable level, and that the ratio of executive directors to non-executive directors, as well as the size of the audit committee, is kept at an optimal level.

scholarly journals Methodology for Assessing and Managing the Environmental Performance of Skidding and Feller Buncher Tractors

Forests ◽  
2021 ◽  
Vol 12 (12) ◽  
pp. 1723
Author(s):  
Igor Grigorev ◽  
Ol’ga Kunickaya ◽  
Evgeniy Tikhonov ◽  
Edward Hertz ◽  
Anna Khakhina ◽  
...  
Keyword(s):  
Soil Compaction ◽  
Negative Impact ◽  
Maximum Load ◽  
Ecological Efficiency ◽  
Tire Pressure ◽  
Tracked Vehicles ◽  
System Pressure ◽  
Study Results ◽  
The Impact ◽  
Wheeled Vehicles

Systematic assessments on the effects of skidding systems on features of forest blueberry pine soil were conducted as part of this study. Assessing the ecological efficiency of forest skidding machines showed that the most significant impact (by 2.0–2.2 times) on soil compaction was observed at loading sites rather than during transportation. Lightweight loam density and sand density increased by 25% and 2%, respectively, after more than two passages of the skidding system. Pressure in 33L-32 tires of forestry machinery in operation on a solid surface varied from 46.5 kPa to 196 kPa at maximum load. Studying the impact of tires on soil compaction showed that the environmental efficiency of forestry equipment can be enhanced if the optimal tire pressure at average loads does not exceed 70 kPa for tracked vehicles and 150 kPa for wheeled vehicles in summer seasons. When ground grips were fully immersed, the pressure of forwarders on soil was reduced. These study results can be used to establish organizational and technological measures in order to manage the negative impact of skidding systems and to increase the environmental effects of their performance.

Sign in / Sign up

Export Citation Format

Share Document