scholarly journals Patogenitas Nematoda Entomopatogen Heterorhabditis spp. Terhadap Larva Spodoptera litura

2021 ◽  
Vol 6 (2) ◽  
pp. 96
Author(s):  
Hawwa' Cahya Maulida ◽  
Saiku Rokhim ◽  
Erna Zahro’in
Keyword(s):  
Light Intensity ◽  
Spodoptera Litura ◽  
Entomopathogenic Nematodes ◽  
Negative Impact ◽  
Entomopathogenic Nematode ◽  
Positive Influence ◽  
The Body ◽  
Factors Affecting ◽  
Synthetic Pesticides

<p><strong>Spodoptera litura is a pest in vegetable plants that attacks the leaves and stems. Damage arising from the attack of S. litura can decrease the productivity of plants. Synthetic pesticides are often used in controlling the population of S. litura, but synthetic pesticides have a high negative impact. Potential entomopathogenic nematode Heterorhabditis spp. believed to be effective for controlling pest populations. This study aims to find out the pathogenic value of entomopathogenic nematode Heterorhabditis spp. to the larvae of S. litura. Based on the results obtained Heterorhabditis spp. has a positive influence in causing mortality in the larvae of S. litura. Heterorhabditis spp. mortality of up to 42%. Symptoms indicated by larvae of S. litura affected by Heterorhabditis spp. among them the behavior becomes passive, the body becomes flaccid, the cuticle turns red and the tissues inside the body are destroyed. Obtained pathogenicity value Lc 50 Heterorhabditis spp. 7,690 IJ/ml, as for the factors affecting Heterorhabditis spp. such as humidity, temperature, pH, and light intensity.</strong></p><p><em><strong>Keywords – </strong>Entomopathogenic Nematodes, Pathogenicity, Spodoptera litura</em></p>

Factors affecting tender price in the Ghanaian construction industry

2017 ◽  
Vol 22 (3) ◽  
pp. 252-268 ◽  
Author(s):  
Ernest Kissi ◽  
Theophilus Adjei-Kumi ◽  
Edward Badu ◽  
Emmanuel Bannor Boateng
Keyword(s):  
Construction Industry ◽  
Structural Equation ◽  
Construction Projects ◽  
Negative Influence ◽  
Positive Influence ◽  
The Body ◽  
Content Type ◽  
Factors Affecting ◽  
Practical Implications ◽  
Structured Questionnaire

Purpose Tender price remains an imperative parameter for clients in deciding whether to invest in a construction project, and it serves as a basis for tender price index (TPI) manipulations. This paper aims to examine the factors affecting tender price in the construction industry. Design/methodology/approach Based on the literature review, nine independent constructs and one dependent construct relating to tender pricing were identified. A structured questionnaire survey was conducted among quantity surveyors in Ghana. Partial least squares structural equation modelling (PLS-SEM) examined the influences of various constructs on tender price development (TPD) and the relationships among TPD and TPI. Findings Results showed that cultural attributes, client attributes, contractor attributes; contract procedures and procurement methods; consultant and design team; external factors and market conditions; project attributes; sustainable and technological attributes; and TPI have a positive influence on tender price, whereas fraudulent attributes exert a negative influence. Practical implications The findings offer construction professionals broader understanding of factors that affect tender pricing. The results may be used in professional decision-making in the pricing of construction projects, as they offer clearer causal relations between how each construct will influence pricing. Originality/value This study adds to the body of construction pricing knowledge by establishing the relationships and degree of influences of various factors on tender price. These findings provide a valuable reference for practitioners.

scholarly journals Analysis of factors affecting audit delay in manufacturing and financial companies listed on IDX

2021 ◽  
Vol 3 (1) ◽  
pp. 27
Author(s):  
Eristamia Faizul Muna ◽  
G. Anggana Lisiantara
Keyword(s):  
Negative Impact ◽  
Stock Exchange ◽  
Linear Regression Analysis ◽  
Secondary Data ◽  
Multiple Linear Regression Analysis ◽  
Positive Influence ◽  
Financial Statement ◽  
Factors Affecting ◽  
Financial Report ◽  
Accounting Firm

The study aims to identify and analyze the factors affecting the audit delay. The study includes a quantitative study using secondary data obtained from the company’s financial statement. The study’s population constituted the entire manufacturing and finance companies listed on the Indonesia Stock Exchange during the year 2018-2019. The sample is collected by using purposive sampling over the listed companies in the criteria that the company publishes the audited financial report as of December 31 and also shows the data needed in the study. The sample which has met the criteria is 510 companies and analyzed by multiple linear regression analysis. The results show that the industrial type and complexity of the company have a positive influence on the audit delay, the auditor opinions, the reputation of Public Accounting Firm and the company’s size have a negative impact on the audit delay, while the profitability does not affect the audit delay.

Mechanism, kinematic performance, and fitness consequences of jumping behavior in entomopathogenic nematodes (Steinernema spp.)

1999 ◽  
Vol 77 (12) ◽  
pp. 1947-1955 ◽  
Author(s):  
James F Campbell ◽  
Harry K Kaya
Keyword(s):  
Surface Tension ◽  
Entomopathogenic Nematodes ◽  
Entomopathogenic Nematode ◽  
Water Film ◽  
Surface Tension Force ◽  
Host Finding ◽  
The Body ◽  
Loop Formation ◽  
Head Region ◽  
Body Regions

The mechanism enabling entomopathogenic nematodes (Steinernema spp.) to jump is described. Jumping performance is measured and the contribution of jumping to host finding is estimated. We used the entomopathogenic nematode Steinernema carpocapsae as a model species for the genus. Nematodes jump using a two-step process of forming and contracting a loop. During loop formation, the nematode bends the anterior half of its body until the head region makes contact with the side of the body. The two body regions are held fast by the surface tension of the water film covering the nematode. When the loop is contracted, the body becomes contorted so that the cuticle kinks. This extreme bending generates and stores sufficient energy that when the surface-tension force is broken the nematode is propelled through the air. The nematode (0.558 mm in length) can jump a distance of 4.8 ± 0.8 mm (mean ± SEM) and a height of 3.9 ± 0.1 mm. The contribution of jumping to host finding varies among species and is related to the foraging strategy used by each species.

Factors Affecting the Price of Luxury Suites in Major North American Sports Facilities

2012 ◽  
Vol 26 (3) ◽  
pp. 249-257 ◽  
Author(s):  
Stephen L. Shapiro ◽  
Tim DeSchriver ◽  
Daniel A. Rascher
Keyword(s):  
North American ◽  
Negative Influence ◽  
Positive Influence ◽  
The Body ◽  
Professional Sport ◽  
Sports Facilities ◽  
Sporting Events ◽  
Empirical Examination ◽  
Factors Affecting ◽  
Explanatory Variables

Luxury suites have become a key revenue source and an important element of sport facility design for professional sport organizations. There are a variety of factors influencing the pricing of luxury suites; however, the recent recession has impacted the premium seat sales market significantly. The current investigation was the first empirical examination of luxury suite pricing determinants for professional sport facilities. An economic model, utilizing multiple regression analysis, was constructed to examine the relationship between the current price of luxury suites for major North American professional sports facilities and selected demographic, economic, and team/facility/league-specific explanatory variables, in a uncertain economic climate. The final economic models were found to be significant, explaining 57% and 60% of the variability in luxury suite prices, respectively. Significant variables of interest included team performance and league affiliation, which had a positive influence and the number of competing venues, which had a negative influence on luxury suite prices. The current findings further the body of knowledge in the pricing of admissions to sporting events though the development of the first pricing determinants models for luxury suites, which take into consideration the tenuous economic environment.

scholarly journals The Effect of Extract of Getih-Getihan (Rivina humilis L.) on Armyworm (Spodoptera litura F.) Mortality

BIOEDUKASI ◽  
2018 ◽  
pp. 22
Author(s):  
Dewi Nurhayati ◽  
Wachju Subchan ◽  
Jekti Prihatin
Keyword(s):  
Spodoptera Litura ◽  
Negative Impact ◽  
Probit Analysis ◽  
Crop Failure ◽  
Anova Test ◽  
Lc50 Value ◽  
Botanical Pesticide ◽  
Active Chemical ◽  
Synthetic Pesticides ◽  
Layer Chromatography

Armyworm (Spodoptera litura F.) is a leaf-eating pest causes the loss of crops from 85% until causing crop failure. Alternative pest control and to reduce the negative impact of synthetic pesticides include using botanical pesticide. Getih-getihan plant (Rivina humilis L.) is one of the plants having potency as a botanical pesticide. Based on the description, this study was conducted to determine LC50 value by using probit analysis and analysis of an extract of Rivina humilis L. leaves on the mortality of Spodoptera litura F. using ANOVA test. Rivina humilis L. leaves are extracted by using ethanol solvent to get active chemical to kill Spodoptera litura F.. TLC (Thin Layer Chromatography) result test of an extract of Rivina humilis L. are positively contain an alkaloid, flavonoid, tannin, and terpenoid. The method of the research uses CRD (Complete Random Design) with five times repetition. Concentration serial being tested are 0%, 0.5%, 1%, 1.5%, 2%, and 2.5%. The result of probit analysis is 1.42% of LC50 value and ANOVA test shows that extract of Rivina humilis L. leaves affects very significantly on the Spodoptera litura F. mortality (p=0.000). Keywords: Spodoptera litura F., Rivina humilis L., leaves extract.

scholarly journals Influence of stress factors on the personality of employees of the Russian penal system in the course of professional activity

2021 ◽  
Vol 228 (5) ◽  
pp. 35-46
Author(s):  
YULIYA A. SOKOLOVA ◽  
Keyword(s):  
Negative Impact ◽  
Emotional Health ◽  
The Body ◽  
Stress Factors ◽  
Professional Activity ◽  
Penal System ◽  
Structural Method ◽  
Factors Affecting ◽  
Professional Stress ◽  
The Impact

Abstract. The article examines the issues related to the influence of stress factors on the personality of penal system employees, analyzes the concept of stress, the symptoms of its manifestation, as well as the causes of stress. The article is devoted to the results of psycho-diagnostic research and scientific literature on the topic of the work. The research is aimed at studying stress factors affecting the personality of the penal system employees, confirming the statement that the professional activity of the penal system employees takes place in tense, conflict, extreme conditions, it is associated with the presence of permanent stress factors, which leads to the development of professional stress, has a negative impact on the mental and emotional state of the individual, affects the success of the performance of official duties. The methodological basis of the research includes methods of analysis and synthesis, statistical and system- structural method. As a result of this work, the concept of stress as a response of the body to the impact of the external environment has been studied, its symptoms have been identified. The stress factors of professional activity are analyzed, their negative impact on the personality of the penal system employees is investigated, professionally important qualities that prevent the negative impact of stress on the personality are highlighted. It has been established that the intensity of the stress factors’ impact on the personality of penal system employees depends on the length of service in the penal system, age, and the level of professionalism. Conclusions are drawn about the importance of preventing stressful conditions for maintaining and strengthening the mental and emotional health of employees, for reducing the risk of development of negative personality changes, for developing skills of overcoming and regulating stressful conditions, for the successful fulfillment of professional duties. Key words: professional stress, stress factors, professional activity, penal system employees, penal system.

scholarly journals Analysis of Factors Affecting a Driver’s Driving Speed Selection in Low Illumination

2020 ◽  
Vol 2020 ◽  
pp. 1-8
Author(s):  
Jing Liu ◽  
Jing Cai ◽  
Shanshan Lin ◽  
Jianyou Zhao
Keyword(s):  
Negative Impact ◽  
Reliability And Validity ◽  
Positive Influence ◽  
Driving Ability ◽  
Driving Experience ◽  
Factors Affecting ◽  
Driving Speed ◽  
Significant Negative Impact ◽  
Speed Selection ◽  
Low Illumination

To better understand a driver’s driving speed selection behaviour in low illumination, a self-designed questionnaire was applied to investigate driving ability in low illumination, and the influencing factors of low-illumination driving speed selection behaviour were discussed from the driver’s perspective. The reliability and validity of 243 questionnaires were tested, and multiple linear regression was used to analyse the comprehensive influence of demographic variables, driving speed in a low-illumination environment with street lights and driving ability on speed selection behaviour in low illumination without street lights. Pearson’s correlation test showed that there was no correlation among age, education, accidents in the past 3 years, and speed selection behaviour in low illumination, but gender, driving experience, number of night-driving days per week, and average annual mileage were significantly correlated with speed selection behaviour. In a low-illumination environment, driving ability has a significant influence on a driver’s speed selection behaviour. Technical driving ability under low-illumination conditions of street lights has the greatest influence on speed selection behaviour on a road with a speed limit of 120 km/h (β = 0.51). Risk perception ability has a significant negative impact on speed selection behaviour on roads with speed limits of 80 km/h and 120 km/h (β = −0.25 and β = −0.34, respectively). Driving speed in night-driving environment with street lights also has a positive influence on speed selection behaviour in low illumination (β = 0.61; β = 0.28; β = 0.37).

scholarly journals Factors affecting activities to prevent and suppress ethnic conflicts in the Russian Federation

2021 ◽  
Vol 12 (4) ◽  
pp. 14-28
Author(s):  
Vitaly N. Naydenko
Keyword(s):  
Russian Federation ◽  
Negative Impact ◽  
Migration Policy ◽  
Positive Influence ◽  
Russian Society ◽  
Self Awareness ◽  
Ethnic Conflicts ◽  
Factors Affecting ◽  
The Russian Federation ◽  
Main Factors

The article analyses the activities to prevent and suppress ethnic conflicts, activities that form a major component of the national security system of the Russian Federation against extremist, including terrorist, threats. The article examines the features and the degree of influence of the main factors on the activities of state structures, religious organisations, public associations for the prevention and suppression of interethnic conflicts. The survey of twenty experts who are highly qualified specialists in the field of countering ethno-extremism conducted by the author using the methods of questionnaires and in-depth interviews, as well as the results of mass sociological studies and analysis of scientific works and media publications on the topic of the research allowed to determine the degree of influence of the main factors on the ethno-conflict sphere. It was revealed as a result of the research, that the Russian Orthodox Church, traditional Muslim organisations and public law enforcement organisations, primarily Cossack organisations and voluntary people's guards, have the most positive influence on activities to prevent and suppress ethnic conflicts. The factor of "spreading the ideology of the" Russian world "" in the context of aggravated relations with Western countries has practically no effect on anti-conflict activities in the ethno-national sphere. Attempts to support foreign followers of the Russian patriotic project evoke nothing more but Russophobic reaction from the political elites in a number of foreign states. Such factors as “deficiencies in educational and upbringing activities”, as well as “pandemic”, have a negative impact on the activities aimed at preventing and suppressing ethnic conflicts in Russia. The worst influence on the prevention and suppression of ethnic conflicts, according to the experts interviewed, have “activities of elites in national formations”, “migration policy”, as well as “development of Internet communications and social networks”. The author proves that taking into account the peculiarities and degree of influence of the main factors on activities to prevent and suppress ethnic conflicts will not only allow the authorities to ensure the protection of the Russian society from ethno-national threats but also to more effectively solve important tasks of strengthening the all-Russian self-awareness and spiritual community of the Russian nation, harmonising ethno-national relations and state-civil consolidation in the Russian Federation.

scholarly journals Keefektifan Patogenesitas Steirmema Carpocapsae (all strain) terhadap Hama Plutella xylostella L.

2021 ◽  
Vol 5 (1) ◽  
pp. 51
Author(s):  
Mariyono Mariyono ◽  
Eko Yuliarsha Sidhi ◽  
Nugraheni Hadiyanti
Keyword(s):  
Plutella Xylostella ◽  
Entomopathogenic Nematodes ◽  
Insect Pests ◽  
Entomopathogenic Nematode ◽  
The Body ◽  
Steinernema Carpocapsae ◽  
Infective Juvenile ◽  
Lc50 Value ◽  
Steinernema Glaseri ◽  
Significant Difference

The utilization of entomopathogenic nematodes is an example of the uses of an environmentally friendly biological agent. Entomopathogenic nematodes of the family Steinernematidae and Hetrorhabditidae are very potential to control insect pests. The purpose of this study was to study the pathogenicity of the entomopathogenic nematode Steinernema carpocapsae (all strains) as a biological control against Plutella xylostella. This research includes 2 stages, namely the preparation stage and laboratory experiments. The experimental design in this study was a completely randomized design (CRD) consisting of six treatments and three replications. The treatments tested were entomopathogenic nematode concentrations consisting of six levels: 0, 8, 16, 32, 64 and 128 infective juvenile per ml. The LC50 and LT50 values were calculated using Probit analysis. The results of observations of nematodes that enter the insect body and pest mortality were analyzed using analysis of variance (ANOVA), once showing a significant difference, it was then continued to the DMRT test at 5% level. Based on the results of the study, the highest pathogenicity against Plutella xylostella was Steinernema carpocapsae (all strains) when compared to Steinernema glaseri (NC) and Steinernema sp. local isolates. Resistance to Steinernema carpocapsae (all strains) and the LC50 value were determined by the age of Plutella xylostella larvae. The bigger and older the larvae, the more its resistance to Steinernema carpocapsae (All strains) and the LC50 value. The number of entomopathogenic nematodes that enter the body of Plutella xylostella increased with increasing length of contact time.Penggunaan nematoda entomopatogen merupakan salah satu pemanfaatan agensia hayati yang ramah lingkungan. Nematoda entomopatogen dari famili Steinernematidae dan Hetrorhabditidae sangat potensial untuk mengendalikan serangga hama. Tujuan dari penelitian ini adalah mempelajari patogenisitas nematoda entomopatogen Steinernema carpocapsae (all strain) sebagai pengendali hayati terhadap hama Plutella xylostella. Penelitian ini meliputi 2 tahap yaitu tahap persiapan dan percobaan laboratorium. Rancangan percobaan pada penelitian ini adalah Rancangan Acak Lengkap (RAL) yang terdiri enam perlakuan dan tiga ulangan. Perlakuan yang diujikan adalah konsentrasi nematoda entomopatogen yang terdiri enam taraf: 0, 8, 16, 32, 64 dan 128 infektif juvenile/ml. Nilai LC50 dan LT50 dihitung menggunakan analisis probit. Hasil pengamatan nematoda yang masuk dalam tubuh serangga dan mortalitas hama dianalisis menggunakan analisis sidik ragam (ANOVA), apabila menunjukkan beda nyata dilanjutkan uji DMRT taraf 5%. Berdasarkan hasil penelitian, patogenisitas tertinggi terhadap Plutella xylostella adalah Steinernema carpocapsae (all strain) bila dibandingkan dengan Steinernema glaseri (NC) dan Steinernema sp. isolat lokal. Ketahanan terhadap Steinernema carpocapsae (All strain) dan nilai LC50 ditentukan umur larva Plutella xylostella. Semakin besar dan tua umur larva, ketahanan terhadap Steinernema carpocapsae (All strain) dan nilai LC50 juga semakin meningkat. Jumlah nematoda entomopatogen yang masuk kedalam tubuh Plutella xylostella semakin banyak seiring dengan bertambah lamanya waktu kontak.

scholarly journals The influence of privatization on financial performance of Vietnamese privatized state-owned enterprises

2019 ◽  
Vol 16 (3) ◽  
pp. 341-352 ◽  
Author(s):  
Duc Cuong Pham ◽  
Thi Xuan Hong Nguyen
Keyword(s):  
Financial Performance ◽  
Negative Impact ◽  
Positive Influence ◽  
State Ownership ◽  
Rank Test ◽  
Factors Affecting ◽  
Fair Competition ◽  
Before And After ◽  
Privatized Firms ◽  
The Government

This research evaluates the differences in financial performance of enterprises before and after privatization aiming to find out the influence of privatization on the enterprises’ performance. The study is based on the audited financial statements of 105 Vietnamese privatized enterprises privatized in the period from 2005 to 2016. Applying the Wilcoxon signed-rank test, the obtained results prove that after privatization profitability and outputs of investigated firms are significantly higher than prior privatization. However, there is no significant change of leverage. Applying a regression model to evaluate the factors affecting financial performance of firms in the research model, it was found out that the proportion of state ownership, economic growth, operating period, enterprise`s size, and business risk have positive influence on the financial performance of research firms. However, the leverage of these firms has a negative impact on the financial performance. In accordance with the obtained results, this study suggests that the privatization process should be continued regardless of firm size or business type. The government should create fair competition environment, remove incentives and supports for State-Owned Enterprises (SOEs), manage changes in privatized firms, and enforce the legal system.

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