scholarly journals Nitrate Accumulation in Relation to Molybdenum Deficiency Leaf Scorch Symptoms

1960 ◽  
Vol 13 (1) ◽  
pp. 104
Author(s):  
LF Notley ◽  
GL Wilson
Keyword(s):  
Leaf Tissue ◽  
Nitrate Content ◽  
Nitrate Accumulation ◽  
Leaf Scorch ◽  
Quantitative Studies ◽  
The Relationship

The accumulation of nitrate in the leaf tissue of nitrate-supplied, molybdenumdeficient plants has been suspected as a cause of the scorching symptoms which frequently develop (e.g. Agarwala 1952; Agarwala and Hewitt 1952; Hewitt and McCready 1953). Quantitative studies of the relationship between nitrate content and the symptoms have, however, been inconclusive. The literature suggests (cf. Wilson and Waring 1948; Johnson, Pearson, and Stout 1952) that this may follow from the estimation of nitrate in whole leaf tissue rather than in damaged portions.

scholarly journals EC Sensitivity of Hydroponically-Grown Lettuce (Lactuca sativa L.) Types in Terms of Nitrate Accumulation

Agriculture ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 315
Author(s):  
Noémi Kappel ◽  
Ildikó Fruzsina Boros ◽  
Francia Seconde Ravelombola ◽  
László Sipos
Keyword(s):  
Lactuca Sativa ◽  
Nitrate Content ◽  
Saline Condition ◽  
Fresh Weight ◽  
Nitrate Level ◽  
Nitrate Accumulation ◽  
Strong Negative Correlation ◽  
Lactuca Sativa L ◽  
Hydroponically Grown ◽  
European Markets

The goal of this research was to investigate the effect of electrical conductivity (EC) levels of the nutrient solution on the fresh weight, chlorophyll, and nitrate content of hydroponic-system-grown lettuce. The selected cultivars are the most representative commercial varieties grown for European markets. Seven cultivars (‘Sintia,’ ‘Limeira,’ ‘Corentine,’ ‘Cencibel,’ ‘Kiber,’ ‘Attiraï,’ and ‘Rouxaï’) of three Lactuca sativa L. types’ (butterhead, loose leaf, and oak leaf) were grown in a phytotron in rockwool, meanwhile the EC level of the nutrient solutions were different: normal (<1.3 dS/m) and high (10 dS/m). The plants in the saline condition had a lower yield but elevated chlorophyll content and nitrate level, although the ‘Limeira’ and ‘Cencibel’ cultivars had reduced nitrate levels. The results and the special characteristic of the lollo-type cultivars showed that the nitrate level could be very different due to salinity (‘Limeira’ had the lowest (684 µg/g fresh weight (FW)) and ‘Cencibel’ had the highest (4396 µg/g FW)). There was a moderately strong negative correlation (−0.542) in the reverse ratio among the chlorophyll and nitrate contents in plants treated with a normal EC value, while this relationship was not shown in the saline condition. Under the saline condition, cultivars acted differently, and all examined cultivars stayed under the permitted total nitrate level (5000 µg/g FW).

scholarly journals Study of nitrate levels in fruits and vegetables to assess the potential health risks in Bangladesh

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rayhan Uddin ◽  
Mostak Uddin Thakur ◽  
Mohammad Zia Uddin ◽  
G. M. Rabiul Islam
Keyword(s):  
Cluster Analysis ◽  
Health Risks ◽  
Fruits And Vegetables ◽  
Risk Index ◽  
Daily Intake ◽  
Point Estimate ◽  
Nitrate Content ◽  
Nitrate Accumulation ◽  
Health Risk Index ◽  
Potential Health

AbstractNitrate is a chemical compound naturally present in fruits and vegetables. This study aims at assessing the nitrate levels and health risks arising from high consumption of fruits and vegetables in Bangladesh. Sixteen species of fruits and vegetables were examined for nitrates using High-Performance Liquid Chromatography with Photo Diode Array (PDA) detector. Ward’s hierarchical cluster analysis was carried out to identify the cluster of tested fruits and vegetables for the nitrate contents. A point estimate of the daily intake was applied to find the health risks that arise due to elevated levels of nitrate in fruits and vegetables. The results show that root and tuber vegetables accumulate significantly higher levels of nitrate in comparison to fruits and fruit vegetables (P < 0.05). In cluster analysis, the nitrate accumulation of fruits and vegetables show four clear clusters contributing to 29.54%, 7.17%, 4.42%, and 58.57% of the total nitrate content in the entire sample. The risk assessment of the Estimated Daily Intake (EDI) and Health Risk Index (HRI) of almost all the tested samples was in the acceptable range, except for radish, thereby indicating the acceptance of risk due to nitrate intake in Bangladesh. As nitrate may have had risk factor for health, during cultivation and storing the product should be properly monitored.

scholarly journals Association among depression, cognitive impairment and executive dysfunction after stroke

2012 ◽  
Vol 6 (3) ◽  
pp. 152-157 ◽  
Author(s):  
Luisa Terroni ◽  
Matildes F.M. Sobreiro ◽  
Adriana B. Conforto ◽  
Carla C. Adda ◽  
Valeri D. Guajardo ◽  
...  
Keyword(s):  
Cognitive Impairment ◽  
Neuropsychological Tests ◽  
Executive Dysfunction ◽  
Stroke Survivors ◽  
Stroke Patients ◽  
Adequate Treatment ◽  
Post Stroke ◽  
Quantitative Studies ◽  
Post Stroke Depression ◽  
The Relationship

ABSTRACT The relationship between depression and cognitive impairment, frequent after stroke, is complex and has not been sufficiently elucidated. Objective: To review the relationship between post-stroke depression and cognitive impairment. Methods: We performed a PubMed database search spanning the last ten years, using the terms post-stroke depression, cognitive dysfunction, cognitive impairment and neuropsychological tests. Our target studies were original quantitative studies that investigated the relationship between post-stroke depression (PSD) and cognitive impairment in stroke patients. Articles published in English, Spanish, Italian and Portuguese were considered. Selection criteria were the use of neuropsychological tests to assess cognitive function, and of either instruments to diagnose major depression, or scales to assess depressive symptoms, within the first three months after stroke. Results: Six original quantitative studies fulfilled the criteria. The prevalence of PSD within the first three months after stroke ranged from 22% to 31%. Incidence ranged from 25% to 27% and was evaluated in only two studies. PSD was associated with increased cognitive impairment. Cognitive impairment was reported in 35.2% to 87% of the patients. Post-stroke cognitive deficits were reported mostly in executive function, memory, language, and speed of processing. Conclusion: Executive dysfunction and depression occur in stroke survivors, are frequently coexistent, and also associated with worse stroke prognosis. Healthcare professionals need to address and provide adequate treatment for depression and executive dysfunctions in stroke patients early in the first three months after stroke. Future studies should evaluate the efficacy of programs evaluating the early detection and treatment of PSD and executive dysfunction in stroke survivors.

Knowledge heterogeneity, social capital, and organizational innovation

2018 ◽  
Vol 31 (2) ◽  
pp. 304-322 ◽  
Author(s):  
Fu-Sheng Tsai
Keyword(s):  
Social Capital ◽  
Design Methodology ◽  
Qualitative Data ◽  
Organizational Innovation ◽  
Three Dimensions ◽  
Shared Knowledge ◽  
Content Type ◽  
Quantitative Studies ◽  
The Relationship ◽  
Heterogeneous Knowledge

Purpose Observing across four comparative case organizations, the purpose of this paper is to identify two sources of contingency (i.e. construct and contextual contingency) for the relationship between knowledge heterogeneity and innovation. Design/methodology/approach The contingencies was explored by conducting a comparative case analyses with rich qualitative data extracted and interpreted from four case companies. Findings First, the construct contingency is examined by refining knowledge heterogeneity into three dimensions: domain, process, and context heterogeneity. Specifically, the author proposed that knowledge heterogeneity in domain is associated with innovation in an inverted U-shape, while heterogeneity in process and context dimensions both negatively influence innovation. Second, contextual contingency is studied. The author proposed that: trust positively moderates the relationship between knowledge heterogeneity and innovation; depending on the knowledge owner attributes, centralization positively or negatively moderates the relationship between heterogeneous knowledge and innovation; shared knowledge vision positively moderates the relationship between knowledge heterogeneity and innovation. Originality/value The influences of knowledge heterogeneity on innovation have yet been inconsistent. The present study set to reconcile such inconsistency with a solution of contingencies that intervene the heterogeneity-innovation relationship. These results offer useful references for future large-scaled, quantitative studies.

Thirty years of the Journal of Derivatives and Quantitative Studies: a bibliometric analysis

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Jun Sik Kim ◽  
Sol Kim
Keyword(s):  
Bibliometric Analysis ◽  
Behavioral Finance ◽  
Implied Volatility ◽  
Impact Factors ◽  
Academic Journal ◽  
Content Type ◽  
Quantitative Studies ◽  
Korean Journal ◽  
And Cluster Analysis ◽  
The Relationship

PurposeThis paper aims to provide a retrospective on the Journal of Derivatives and Quantitative Studies (JDQS) on its 30th anniversary based on a bibliometric analysis.Design/methodology/approachThe authors use the performance analysis to analyze patterns in JDQS's publications, citations and citation indices over the years. To investigate the relationship among keywords and authors, the authors of this paper employ science mapping by analyzing keyword-level networks and author-level networks using the KCI- Korean Journal Database of WOS. The authors use VOSviewer for bibliographic analysis and cluster analysis at the keyword and author levels. To study the effect of JDQS articles' attributes on citations of the articles, the authors conduct a regression analysis with KCI data. The authors regress the citations for each article on the article's attributes.FindingsJDQS's yearly publications, citations, impact factors and centrality indices grew in the early 2010s before diminishing in 2020. Keyword network analysis reveals that JDQS's main keywords include behavioral finance, implied volatility, information asymmetry, price discovery, KOSPI200 futures, volatility and KOSPI200 options. Citations of JDQS articles are mainly driven by article age, demeaned age squared, conference, nonacademic authors and language. Based on the number of views and downloads of JDQS articles, the authors find that recent changes in publisher and editorial and publishing policies have increased the journal's visibility.Originality/valueThis study quantitatively analyzed the bibliographic information of papers published in JDQS, a representative Korean academic journal in the finance area. This confirms the academic contribution of JDQS over the past 30 years and provides implications for future strategies of the journal. It shows the patterns in JDQS's publications, citations and citation indices and identifies the main authors and most cited papers. However, there is no such bibliometric analysis on Korean financial journals; thus, this study can contribute to the literature in this point.

Conclusion: Clemency’s Place

2019 ◽  
pp. 226-252
Author(s):  
Daniel Pascoe
Keyword(s):  
Criminal Justice ◽  
Research Agenda ◽  
Southeast Asian ◽  
Future Research ◽  
Future Research Agenda ◽  
Quantitative Studies ◽  
Capital Cases ◽  
Judicial Sanctions ◽  
The Impact ◽  
The Relationship

The Conclusion, after briefly summarizing the respective country positions and restating the three-part hypothesis outlined in Chapter 7, considers what Southeast Asia’s ‘natural experiment’ on clemency means for policymakers, NGO staff, and legal practitioners working on death penalty cases in the region. The four national case studies, together with Chapter 7’s comparative hypothesis, suggest various practical means of boosting each Southeast Asian jurisdiction’s clemency rate within finalized capital cases. The Conclusion also considers what implications the comparative findings outlined in Chapter 7 have for the broader criminal justice literature in other parts of the world (particularly concerning the relationship between discretion exercised at different stages of a criminal case, the relationship between extrajudicial and judicial sanctions, the impact of democratization on criminal justice policies, and the influence of delay on criminal justice decision-making). Finally, the Conclusion suggests a future research agenda, including quantitative studies to ‘test’ the accuracy of the book’s three-part hypothesis in other parts of the retentionist world. The chapter ends with several predictions regarding the future of capital clemency in the four Southeast Asian jurisdictions under analysis (Thailand, Singapore, Malaysia, and Indonesia).

A STUDY OF MOISTURE STORAGE AND NITRATE ACCUMULATION IN SOIL AS RELATED TO WHEAT YIELDS ON FOUR CROPPING SEQUENCES

1961 ◽  
Vol 41 (1) ◽  
pp. 5-15 ◽  
Author(s):  
W. Michalyna ◽  
R. A. Hedlin
Keyword(s):  
Clay Soil ◽  
Mineral Fertilizer ◽  
Nitrate Accumulation ◽  
Fertilizer Use ◽  
Seeding Time ◽  
University Of Manitoba ◽  
Moisture Storage ◽  
The University ◽  
Relationship Of ◽  
The Relationship

On a clay soil at Winnipeg, Manitoba, at the University of Manitoba, four cropping sequences, namely: 1) fallow wheat; 2) fallow, wheat, wheat; 3) fallow, wheat, wheat, wheat; 4) wheat continuous have been under study since 1919. During the years 1956, 1957 and 1958 a detailed study of the relationship of wheat yields on these sequences to moisture consumption, nitrate accumulation, moisture storage and fertilizer use was undertaken. In general, yields were higher on fallowed than on non-fallowed plots. The higher yields on fallowed plots were, in part, related to nitrate accumulation during the fallow year. The yield differential between fallowed and non-fallowed plots was reduced by mineral fertilizer and manure treatments. Where no fertilizer was used the greatest wheat production in bushels per acre per year was on the fallow-wheat-wheat sequence. When fertilized or manured, the greatest production occurred on the wheat continuous plots.Rapid accumulation of moisture took place between harvest and the following spring. As a result, during years 1956, 1957 and 1958, there was only an average of 0.7 inches more available moisture to a 4-foot depth on fallow plots at seeding time than on plots which had been cropped the previous year.

scholarly journals Difference between Burley Tobacco and Flue-Cured Tobacco in Nitrate Accumulation and Chemical Regulation of Nitrate and TSNA Contents

2017 ◽  
Vol 2017 ◽  
pp. 1-13 ◽  
Author(s):  
Yafei Li ◽  
Hongzhi Shi ◽  
Huijuan Yang ◽  
Jun Zhou ◽  
Jing Wang ◽  
...  
Keyword(s):  
Nitrate Reductase Activity ◽  
Reductase Activity ◽  
Growth Period ◽  
Fast Growth ◽  
Nitrate Content ◽  
Maturity Stage ◽  
Nitrate Accumulation ◽  
Burley Tobacco ◽  
Tobacco Specific Nitrosamines ◽  
Growth Experiments

Tobacco-specific nitrosamines (TSNAs) are harmful carcinogens, with nitrate as a precursor of their formation. Nitrate content is considerably higher in burley tobacco than in flue-cured tobacco, but little has been reported on the differences between types of nitrate accumulation during development. We explored nitrate accumulation prior to harvest and examined the effects of regulatory substances aimed at decreasing nitrate and TSNA accumulation. In growth experiments, nitrate accumulation in burley and flue-cured tobacco initially increased but then declined with the highest nitrate content observed during a fast-growth period. When treating tobacco crops with molybdenum (Mo) during fast growth, nitrate reductase activity in burley tobacco increased significantly, but the NO3-N content decreased. These treatments also yielded significant reductions in NO3-N and TSNA contents. Therefore, we suggest that treatment with Mo during the fast-growth period and a Mo-Gfo (Mo-glufosinate) combination at the maturity stage is an effective strategy for decreasing nitrate and TSNAs during cultivation.

scholarly journals A Review of Environment Effects on Nitrate Accumulation in Leafy Vegetables Grown in Controlled Environments

Foods ◽  
2020 ◽  
Vol 9 (6) ◽  
pp. 732
Author(s):  
Zhonghua Bian ◽  
Yu Wang ◽  
Xiaoyan Zhang ◽  
Tao Li ◽  
Steven Grundy ◽  
...  
Keyword(s):  
Environmental Factors ◽  
Molecular Mechanisms ◽  
Management Strategies ◽  
Leafy Vegetables ◽  
Future Research ◽  
Nitrate Content ◽  
Vegetable Production ◽  
Nitrate Accumulation ◽  
Potential Threat ◽  
Controlled Environments

Excessive accumulation of nitrates in vegetables is a common issue that poses a potential threat to human health. The absorption, translocation, and assimilation of nitrates in vegetables are tightly regulated by the interaction of internal cues (expression of related genes and enzyme activities) and external environmental factors. In addition to global food security, food nutritional quality is recognized as being of strategic importance by most governments and other agencies. Therefore, the identification and development of sustainable, innovative, and inexpensive approaches for increasing vegetable production and concomitantly reducing nitrate concentration are extremely important. Under controlled environmental conditions, optimal fertilizer/nutrient element management and environmental regulation play vital roles in producing vegetables with low nitrate content. In this review, we present some of the recent findings concerning the effects of environmental factors (e.g., light, temperature, and CO2) and fertilizer/nutrient solution management strategies on nitrate reduction in vegetables grown under controlled environments and discuss the possible molecular mechanisms. We also highlight several perspectives for future research to optimize the yield and nutrition quality of leafy vegetables grown in controlled environments.

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