scholarly journals Phytopathogenic fungi with potential as biocontrol agents for weeds of importance in crops of Antioquia, Colombia

2021 ◽  
Vol 31 (1) ◽  
Author(s):  
Yerly Mira ◽  
Darío Castañeda ◽  
Juan Morales ◽  
Luis Patiño
Keyword(s):  
Biocontrol Agent ◽  
Phytopathogenic Fungi ◽  
Biocontrol Agents ◽  
Future Research ◽  
Weed Biological Control ◽  
Negative Effects ◽  
Rumex Crispus ◽  
Control Programs ◽  
Resistance To Herbicides ◽  
Management Alternatives

Abstract Background Use of phytopathogenic fungi for the biocontrol of weeds represents a promising path in the search for new management alternatives that allow reducing negative effects on the environment and the generation of biotypes having resistance to herbicides. The first step in developing weed biological control programs is to determine the plants and their natural enemies with the highest affinity and potential to achieve effective biocontrol. The objective of the present study was to evaluate the phytopathogenic potential of fungal isolates on four economically important weeds including: Rumex crispus L., Digitaria horizontalis Willd, Persicaria nepalensis (Meisn.) Miyabe, and Thunbergia alata Bojer ex Sims, as a possible biocontrol agent. Results Morphological and molecular identification of nine phytopathogenic isolates of weeds was achieved, according to the sequencing of the ITS, β-Tub2, and TEF1-α regions. Pathogenicity of the following species on original hosts was confirmed: Colletotrichum cigarro, Epicoccum draconis, and Didymella rumicicola on R. crispus; Bipolaris sp., on D. horizontalis; Bipolaris zeicola, Phialemoniopsis curvata, and Stemphylium beticola on P. nepalensis and, Alternaria thunbergiae and Nigrospora sphaerica on T. alata. These could be, fairly, considered the first worldwide reports of such interactions, except for A. thunbergiae and Bipolaris sp. The most virulent interactions according to the AUDPC value corresponded to (R. crispus × D. rumicicola), (D. horizontalis × Bipolaris sp.), (P. nepalensis × S. beticola) and (T. alata × A. thunbergiae), with an incidence of 100%. Conclusion These strains were proposed for future research as potential biocontrol agents, which represented a great resource for the possible generation of new bio-herbicides.

scholarly journals Impact of Shift Work and Long Working Hours on Worker Cognitive Functions: Current Evidence and Future Research Needs

2021 ◽  
Vol 18 (12) ◽  
pp. 6540
Author(s):  
Veruscka Leso ◽  
Luca Fontana ◽  
Angela Caturano ◽  
Ilaria Vetrani ◽  
Mauro Fedele ◽  
...  
Keyword(s):  
Circadian Rhythm ◽  
Cognitive Impairment ◽  
Sleep Disturbances ◽  
Working Hours ◽  
Night Work ◽  
Current Evidence ◽  
Future Research ◽  
Negative Effects ◽  
Long Working Hours ◽  
Main Determinants

Particular working conditions and/or organization of working time may cause important sleep disturbances that have been proposed to be predictive of cognitive decline. In this regard, circadian rhythm misalignment induced by exposure to night work or long working hours would be responsible for cognitive impairment. Nevertheless, evidence supporting this correlation is limited and several issues still need to be elucidated. In this regard, we conducted a systematic review to evaluate the association between shift/night work and cognitive impairment and address its main determinants. Information provided by the reviewed studies suggested that night work might have serious immediate negative effects especially on cognitive domains related to attention, memory and response inhibition. Furthermore, cognitive performance would progressively worsen over consecutive night shifts or following exposure to very long work shifts. Otherwise, conflicting results emerged regarding the possible etiological role that night work chronic exposure would have on cognitive impairment. Therefore, circadian rhythm desynchronization, lack of sleep and fatigue resulting from night work may negatively impact worker’s cognitive efficiency. However, in light of the considerable methodological variability of the reviewed studies, we proposed to develop a standardized research and evaluation strategy in order to obtain a better and comprehensive understanding of this topic.

scholarly journals Catchment water quality in the year preceding and immediately following restoration of a drained afforested blanket bog

2021 ◽  
Author(s):  
Paul P. J. Gaffney ◽  
Mark H. Hancock ◽  
Mark A. Taggart ◽  
Roxane Andersen
Keyword(s):  
Water Quality ◽  
Nutrient Release ◽  
Pass Rate ◽  
Future Research ◽  
Negative Effects ◽  
Short Term ◽  
Peatland Restoration ◽  
Blanket Bog ◽  
Quality Threshold ◽  
Policy Incentives

AbstractThe restoration of drained afforested peatlands, through drain blocking and tree removal, is increasing in response to peatland restoration targets and policy incentives. In the short term, these intensive restoration operations may affect receiving watercourses and the biota that depend upon them. This study assessed the immediate effect of ‘forest-to-bog’ restoration by measuring stream and river water quality for a 15 month period pre- and post-restoration, in the Flow Country peatlands of northern Scotland. We found that the chemistry of streams draining restoration areas differed from that of control streams following restoration, with phosphate concentrations significantly higher (1.7–6.2 fold, mean 4.4) in restoration streams compared to the pre-restoration period. This led to a decrease in the pass rate (from 100 to 75%) for the target “good” quality threshold (based on EU Water Framework Directive guidelines) in rivers in this immediate post-restoration period, when compared to unaffected river baseline sites (which fell from 100 to 90% post-restoration). While overall increases in turbidity, dissolved organic carbon, iron, potassium and manganese were not significant post-restoration, they exhibited an exaggerated seasonal cycle, peaking in summer months in restoration streams. We attribute these relatively limited, minor short-term impacts to the fact that relatively small percentages of the catchment area (3–23%), in our study catchments were felled, and that drain blocking and silt traps, put in place as part of restoration management, were likely effective in mitigating negative effects. Looking ahead, we suggest that future research should investigate longer term water quality effects and compare different ways of potentially controlling nutrient release.

scholarly journals Evaluation of Indigenous Olive Biocontrol Rhizobacteria as Protectants against Drought and Salt Stress

2021 ◽  
Vol 9 (6) ◽  
pp. 1209
Author(s):  
Nuria Montes-Osuna ◽  
Carmen Gómez-Lama Cabanás ◽  
Antonio Valverde-Corredor ◽  
Garikoitz Legarda ◽  
Pilar Prieto ◽  
...  
Keyword(s):  
Salt Stress ◽  
Abiotic Stresses ◽  
Biochemical Parameters ◽  
Biocontrol Agent ◽  
Negative Effects ◽  
Experimental Conditions ◽  
Acds Gene ◽  
Drought And Salt Stress ◽  
Physiological And Biochemical

Stress caused by drought and salinity may compromise growth and productivity of olive (Olea europaea L.) tree crops. Several studies have reported the use of beneficial rhizobacteria to alleviate symptoms produced by these stresses, which is attributed in some cases to the activity of 1-aminocyclopropane-1-carboxylic acid deaminase (ACD). A collection of beneficial olive rhizobacteria was in vitro screened for ACD activity. Pseudomonas sp. PICF6 displayed this phenotype and sequencing of its genome confirmed the presence of an acdS gene. In contrast, the well-known root endophyte and biocontrol agent Pseudomonas simiae PICF7 was defective in ACD activity, even though the presence of an ACD-coding gene was earlier predicted in its genome. In this study, an unidentified deaminase was confirmed instead. Greenhouse experiments with olive ‘Picual’ plants inoculated either with PICF6 or PICF7, or co-inoculated with both strains, and subjected to drought or salt stress were carried out. Several physiological and biochemical parameters increased in stressed plants (i.e., stomatal conductance and flavonoids content), regardless of whether or not they were previously bacterized. Results showed that neither PICF6 (ACD positive) nor PICF7 (ACD negative) lessened the negative effects caused by the abiotic stresses tested, at least under our experimental conditions.

scholarly journals Perception of Gamblers: A Systematic Review

2021 ◽  
Author(s):  
Andrea Wöhr ◽  
Marius Wuketich
Keyword(s):  
Systematic Review ◽  
Empirical Studies ◽  
Grey Literature ◽  
Future Research ◽  
Gambling Problems ◽  
Negative Effects ◽  
Strong Focus ◽  
The Media ◽  
Social Scientific ◽  
Psychological Knowledge

AbstractIt is generally assumed that gamblers, and particularly people with gambling problems (PG), are affected by negative perception and stigmatisation. However, a systematic review of empirical studies investigating the perception of gamblers has not yet been carried out. This article therefore summarises empirical evidence on the perception of gamblers and provides directions for future research. A systematic literature review based on the relevant guidelines was carried out searching three databases. The databases Scopus, PubMed and BASE were used to cover social scientific knowledge, medical-psychological knowledge and grey literature. A total of 48 studies from 37 literature references was found. The perspective in these studies varies: Several studies focus on the perception of gamblers by the general population, by subpopulations (e. g. students or social workers), or by gamblers on themselves. The perspective on recreational gamblers is hardly an issue. A strong focus on persons with gambling problems is symptomatic of the gambling discourse. The analysis of the studies shows that gambling problems are thought to be rather concealable, whereas the negative effects on the concerned persons‘ lives are rated to be quite substantial. PG are described as “irresponsible” and “greedy” while they perceive themselves as “stupid” or “weak”. Only few examples of open discrimination are mentioned. Several studies however put emphasis on the stereotypical way in which PG are portrayed in the media, thus contributing to stigmatisation. Knowledge gaps include insights from longitudinal studies, the influence of respondents‘ age, culture and sex on their views, the relevance of the type of gambling a person is addicted to, and others. Further studies in these fields are needed.

Working with Industrial Cobots: The Influence of Reliability and Transparency on Perception and Trust

2021 ◽  
Vol 65 (1) ◽  
pp. 77-81
Author(s):  
Lina Kluy ◽  
Eileen Roesler
Keyword(s):  
Study Design ◽  
Real Life ◽  
Error Rates ◽  
Future Research ◽  
Negative Effects ◽  
Perceived Safety ◽  
Fine Grained ◽  
Online Study ◽  
Human Robot Collaboration ◽  
Positive Effect

Industrial human-robot collaboration (HRC) is not yet widely spread but on the rise. This development raises the question about properties collaborative robots (cobots) need, to enable a pleasant and smooth interaction. Therefore, this study investigated the influence of transparency and reliability on perception of and trust towards cobots. A video-enhanced online study with 124 participants was conducted. Transparency was provided through the presentation of differing information, and reliability was manipulated through differing error rates. The results showed a positive effect of transparency on perceived safety and intelligence. Reliability had a positive effect on perceived intelligence, likeability and trust. The effect of reliability on trust was more pronounced for low transparent robots. The results indicate the relevance of carefully selected information to counteract negative effects of failures. Future research should transfer the study design into a real-life experiment with more fine-grained levels of transparency and reliability.

Do “rising stars” avoid risk?: status-based labels and decision making

2014 ◽  
Vol 35 (2) ◽  
pp. 121-136 ◽  
Author(s):  
Igor Kotlyar ◽  
Leonard Karakowsky ◽  
Mary Jo Ducharme ◽  
Janet A. Boekhorst
Keyword(s):  
Decision Making ◽  
Corporate Strategy ◽  
Business Students ◽  
Risk Tolerance ◽  
High Potential ◽  
Future Research ◽  
High Status ◽  
Negative Effects ◽  
Risky Decision ◽  
Content Type

Purpose – The purpose of this paper is to empirically examine how status-based labels, based on future capabilities, can impact people's risk tolerance in decision making. Design/methodology/approach – In this paper the authors developed and tested theoretical arguments using a set of three studies employing a scenario-based approach and a total of 449 undergraduate business students. Findings – The findings suggest that labeling people in terms of future capabilities can trigger perceptions of public scrutiny and influence their risk preferences. Specifically, the results reveal that individuals who are recipients of high-status labels tend to choose lower risk decision options compared to their peers. Research limitations/implications – The study employed scenarios to examine the issue of employee labeling. The extent to which these scenarios have truly captured the dynamics of labeling is questionable, and future research should employ a field-based study to examine whether the reported effect can be observed in a “real” work context. Practical implications – Organizations are concerned about their future leadership capacity and often attempt to grow leadership talent by identifying high-potential employees early on. The results of this study suggest that such practice may have an unintentional negative effect of reducing high-potentials’ tolerance toward risky decision making, thus potentially impacting these future leaders’ decision making in the realm of corporate strategy, R&D, etc. Originality/value – The issue of how labeling individuals in terms of future capabilities can impact their risk preference has been largely ignored by organizational research. This paper suggests that the popular practice of identifying high-potential employees may have unintentional negative effects by lowering their risk tolerance.

Acarine biocontrol agents Neoseiulus californicus sensu Athias-Henriot (1977) and N. barkeri Hughes (Mesostigmata: Phytoseiidae) redescribed, their synonymies assessed, and the identity of N. californicus (McGregor) clarified based on examination of types

Zootaxa ◽  
2018 ◽  
Vol 4500 (4) ◽  
pp. 451 ◽  
Author(s):  
FRÉDÉRIC BEAULIEU ◽  
JENNIFER J. BEARD
Keyword(s):  
Biocontrol Agent ◽  
Species Concept ◽  
Biocontrol Agents ◽  
International Commission ◽  
Neoseiulus Californicus ◽  
Zoological Nomenclature ◽  
Male And Female ◽  
Crop Pests ◽  
Type Host ◽  
Single Sex

In 1954, McGregor described two species of phytoseiids from lemon, in California, USA: Typhlodromus californicus McGregor and T. mungeri McGregor, the former represented by one male, and the latter by two females. Since its description, T. mungeri was synonymised under T. californicus, and the name T. (now Neoseiulus) californicus has been used extensively to represent a species that is now commonly used as a biocontrol agent of crop pests worldwide. However, the true identity of the biocontrol agent is uncertain because the original descriptions of T. californicus and T. mungeri were not adequate enough to allow an irrefutable identification, with each description being based on specimens of a single sex. An examination of the types of N. californicus and N. mungeri revealed that they are morphologically identical to the male and female of N. barkeri Hughes, 1948, respectively, and that they are in fact junior synonyms of N. barkeri—and are therefore distinct from the biocontrol agent globally called N. californicus (sensu Athias-Henriot, 1977; see Griffiths, 2015). This is further supported by a comparison with male and female syntypes of N. barkeri, as well as other specimens of N. barkeri including some collected from the type host in the vicinity of the type location (i.e. lemon in southern California, 1952–1958). We redescribe the male and female of both N. barkeri and N. californicus sensu Athias-Henriot (1977), based on representative specimens from at least 14 and 19 populations, respectively. Based on examination of types, we confirm the synonymy of N. mckenziei (Schuster & Pritchard, 1963), N. picketti (Specht, 1968), and N. oahuensis (Prasad, 1968) with N. barkeri, and that the names N. chilenensis (Dosse, 1958b) and N. wearnei (Schicha, 1987) represent the same species as N. californicus sensu Athias-Henriot (1977). We also provide a hypothesis as to why Chant (1959) had erroneously synonymised T. californicus and T. mungeri under T. marinus (Willmann). Finally, we suggest maintaining the prevailing usage of the name N. californicus (McGregor) for the species concept of Athias-Henriot (1977) as followed by subsequent authors, through submission of a separate application to the International Commission of Zoological Nomenclature (ICZN). In the meantime, the current meaning of N. californicus should be maintained until a ruling by the ICZN is made on the application. 

scholarly journals Sustainable governance in forestry and nature protection

2014 ◽  
pp. 113-140
Author(s):  
Dragan Nonic ◽  
Mersudin Avdibegovic ◽  
Jelena Nedeljkovic ◽  
Aleksandar Radosavljevic ◽  
Nenad Rankovic
Keyword(s):  
Natural Resources ◽  
Transition Process ◽  
Future Research ◽  
Negative Effects ◽  
Nature Protection ◽  
Role Of Government ◽  
Economic Changes ◽  
Countries In Transition ◽  
Over Exploitation ◽  
And Control

At the global level, due to the negative effects of over-exploitation of natural resources, numerous processes and initiatives for their conservation and sustainable governance have started. The beginning of the transition process, as well as political and economic changes that followed in the countries in transition, were in line with the new orientation of the international forest and nature protection policy. The transition process has caused, among other things, a redefinition of the role of government in managing natural resources. This meant a shift from ?government? to ?governance? concept. This concept refers to the change from the classical approach of ?command and control? to active participation of all involved parties and establishing rules for the division of responsibilities and benefits. The aim of the paper is to identify, analyze and systematise the current concepts of sustainable governance in forestry and nature protection, their characteristics and the principles on which they are based, with a main purpose of preparation of a research platform for more detailed research in this area. The paper gives recommendations for the application of the principles of governance in forestry and nature protection, as well as recommendations for future research in this area.

scholarly journals The Dark Side of Using Online Social Networks

2021 ◽  
Vol 29 (6) ◽  
pp. 0-0
Keyword(s):  
Social Networks ◽  
Social Exchange ◽  
Online Social Networks ◽  
Dark Side ◽  
Future Research ◽  
Structured Interviews ◽  
Negative Effects ◽  
Privacy Concerns ◽  
Low Performance ◽  
Rich Spectrum

Research on online social networks (OSNs) has focused overwhelmingly on their benefits and potential, with their negative effects overlooked. This study builds on the limited existing work on the so-called ‘dark side’ of using OSNs. The authors conducted a systematic review of selected databases and identified 46 negative effects of using OSNs from the users’ perspective, which is a rich spectrum of users’ negative experiences. This article then proposed nomenclature and taxonomy for the dark side of using OSNs by grouping these negative effects into six themes: cost of social exchange, cyberbullying, low performance, annoying content, privacy concerns and security threats. This study then conducted structured interviews with experts to confirm the sense-making and validity of the proposed taxonomy. This study discusses the confirmed taxonomy and outlines directions for future research.

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