Effectiveness of three Bt corn events against feeding damage by the true armyworm (Pseudaletia unipuncta Haworth)

2007 ◽  
Vol 87 (3) ◽  
pp. 599-603 ◽  
Author(s):  
A. W. Schaafsma ◽  
M. L. Holmes ◽  
J. Whistlecraft ◽  
S. A. Dudley
Keyword(s):  
Field Study ◽  
Key Words ◽  
Fresh Mass ◽  
Insecticidal Protein ◽  
Bt Corn ◽  
Feeding Damage ◽  
Mass Measurements ◽  
Pseudaletia Unipuncta ◽  
True Armyworm

A 3-yr study (2002-2004) was conducted to evaluate the resistance of three Bt corn events to herbivory damage by the armyworm, Pseudaletia unipuncta (Haworth). Resistance was assessed by damage ratings and fresh mass measurements. Greenhouse studies were run in 2002 and 2004, and a field study was conducted in 2003. Hybrids expressing the Cry1A(b) insecticidal protein, Mon810 and Bt176 events, and their near isolines, as well as the TC1507 event, which expresses the Cry1F protein, were evaluated. Bt hybrids suffered less damage in all 3 yr and had higher fresh masses in 2002 and 2003 than the non-transgenic isolines. In 2002 and 2003, hybrids expressing the Cry1A(b) protein were significantly less damaged than the hybrid expressing Cry1F. In both 2002 and 2004, the Mon810 event suffered less damage than the Bt176 event, despite expressing the same Cry1A(b) protein. Bt corn, especially the Mon810 event may be used as an effective method of preventing P. unipuncta herbivory damage in corn. Key words: True armyworm, Pseudaletia unipuncta, Bt corn, Cry1A(b), Cry1F, epistasis

Ritualinis mandagumas (ta’ârof) šiuolaikinio Irano visuomenėje ir tarpkultūrinėje komunikacijoje: Teherano šiaurinės dalies atvejis

2019 ◽  
Vol 19 (28) 2019 ◽  
pp. 169-190
Author(s):  
Dalia Sabaliauskienė
Keyword(s):  
Field Study ◽  
Key Words ◽  
Intercultural Communication ◽  
Capital City ◽  
Cultural Environment ◽  
City Culture ◽  
Face Maintenance

This paper examines the concept and practices of the Iranian ritual courtesy ta’ârof in northern Tehran, based on field-study findings, and analyses its expression in intercultural communication. It examines how contemporary Iranians perceive ta’ârof, what practices of ritual courtesy are commonly found, and whether configurations of the Iranian code of courtesy remain stable in the changing cultural environment. The study employs the theory of face maintenance and data from Iranian face and diaspora research. It shows emic perceptions of ta’ârof, and reveals its practices in Tehran, alongside tendencies of expression among Iranians living in Lithuania. Key words: ta’ârof, ritual courtesy, capital-city culture, intercultural communication, contemporary Iran.

A field study of competition and interaction between Lemna minor and Lemna trisulca

1989 ◽  
Vol 67 (10) ◽  
pp. 2904-2911 ◽  
Author(s):  
Alexander L. McIlraith ◽  
Gordon G. C. Robinson ◽  
Jennifer M. Shay
Keyword(s):  
Life History ◽  
Field Study ◽  
Key Words ◽  
Field Experiments ◽  
Lemna Minor ◽  
Survey Methods ◽  
The Other ◽  
Transplant Experiment ◽  
Replacement Series ◽  
Vegetative Biomass

Field experiments and survey methods were used to assess competition and interaction between Lemna minor L. and Lemna trisulca L. at Delta Marsh, Manitoba. Sites were dominated by one or the other species or codominated by both. Replacement series experiments predicted codominance of L. minor and L. trisulca in an unshaded eutrophic site but predicted L. minor dominance when run for a longer time. Similar experiments conducted in a shaded eutrophic site predicted L. minor dominance. Addition series experiments showed that intraspecific and interspecific competition occurred in the unshaded site. In a eutrophic unshaded ditch, high densities of L. minor suppressed L. trisulca. In a eutrophic shaded site, high densities of L. minor and green algae inhibited L. trisulca, and in a sunny, less eutrophic site high density of each species inhibited the other. In a transplant experiment, L. minor biomass in shaded enclosures approached that found naturally in two shaded sites. Lemna trisulca persisted when shaded. Vegetative biomass trends in an unshaded eutrophic marsh ditch indicated spring and fall L. trisulca dominance and summer L. minor dominance. Shaded eutrophic sites were dominated by L. minor, whereas a less eutrophic site was dominated by L. trisulca. A model is developed to explain dominance patterns, and seasonal life-history responses are considered. Key words: Lemna, duckweed, competition, interaction, resources, light, nutrients.

Pertes de charge des ancrages actifs injectés dans un massif rocheux

1989 ◽  
Vol 16 (1) ◽  
pp. 72-81 ◽  
Author(s):  
Brahim Benmokrane ◽  
Gérard Ballivy
Keyword(s):  
Epoxy Resin ◽  
Field Study ◽  
Key Words ◽  
Solid Rock ◽  
Rapid Loss ◽  
Prestress Loss ◽  
Massif Rocheux ◽  
Second Stage ◽  
Initial Stage

Estimation of loss of prestress is an essential part of the design of permanent or temporary prstressed anchors since stability of the retained structure must not be compromised. Findings of a field study on long-term behaviour of prestressed anchors are presented herein: different lengths of anchors in solid rock were injected with cement grout or epoxy resin. Load variation in the anchors with time indicated two distinct stages of loss of prestress: an initial stage of rapid loss of prestress and a second stage of very minor and uniform loss ending about 6 months after prestressing. Our study also showed that restressing anchors after a period of time reduces subsequent prestress loss and that overdimensioning of the injected length does not. Key words: rock, prestressed injected anchor, grout, loss of prestress, creep, relaxation.

Vibrations due to pile driving—a case study

1989 ◽  
Vol 26 (4) ◽  
pp. 745-747
Author(s):  
D. F. Brunning ◽  
R. C. Joshi
Keyword(s):  
Field Study ◽  
Key Words ◽  
Gas Pipeline ◽  
Granular Soils ◽  
Pile Driving ◽  
Buried Gas Pipeline

Results of a field study in which vibrations due to pile driving were monitored are presented. The objective of this study was to determine the effects of pile driving on a buried gas pipeline. It was concluded that, at this site, the vibrations produced through pile driving were not significant enough to cause damage to the pipeline at distances greater than 1.2 m from the pile. Key words: pile driving, vibrations, granular soils, fill, field study.

Effect of fertilizer management, genotype, and environmental factors on some malting quality characteristics in barley

1994 ◽  
Vol 74 (3) ◽  
pp. 545-547 ◽  
Author(s):  
M. C. Therrien ◽  
C. A. Grant ◽  
C. A. Carmichael ◽  
J. S. Noll
Keyword(s):  
Environmental Factors ◽  
Field Study ◽  
Key Words ◽  
Fertilizer Application ◽  
Quality Characteristics ◽  
Malting Quality ◽  
Fertilizer Management ◽  
Malting Barley ◽  
Management Options ◽  
Fertility Management

A field study conducted at two sites over 3 yr determined that malting quality in barley was influenced largely by environmental and genetic (genotype) factors. Fertility management had a lesser effect, with N fertilizer application having the largest component effect. Results suggest that producers will be limited in their management options when striving for optimal malting quality in barley. Key words: Malting barley, fertilizer management, interactions

scholarly journals SOLONSKE SECTION AND THE PERSPECTIVES OF THE STUDY OF PLEISTOCENE CARPATHIAN FORELAND

2019 ◽  
pp. 73-100
Author(s):  
Roman Hnatiuk ◽  
Igor Papish
Keyword(s):  
Field Study ◽  
Key Words ◽  
Middle Pleistocene ◽  
Buried Soils ◽  
Iron Compounds ◽  
Main Attention ◽  
Alluvial Deposits ◽  
River Terraces ◽  
The Village ◽  
Made In

The article presents the results of the field study of the two artificial outcrops of the Pleistocene deposits, which are located in the suburbs Solonske near Drohobych city. Outcrops (careers) are located within the terrace of the Tysmenytsia River. The height of the terrace is about 50 m above the river level and changes along the distance from the mountains. The main attention in the article is paid to the study of the structure of the upper (covering) stratum of the terrace with a thickness of about 26 m, and also to the characteristics of its consolidated stratigraphic section. The basis of this stratum consists of the layers of non-carbonate loams and clays. They are more or less enriched of iron compounds and gleyed. Between them there are four horizons of buried soils of the interglacial and interstadial rank. Based on the observations made in the field, it was found that the sediments of the covering stratum have mainly river origin. The conditions of their accumulation, as well as the conditions for the formation and transformation of ancient soils, are considered; eight pre-Holocene lito- and pedostratigraphic layers of different rank are singled out. The division of the covering stratum of the terraces into three main layers is sub¬stan¬tiated, which is equivalent to the stratigraphic units of the glacial and interglacial rank. Comparison of the Solonske section with other sections of the similar height terraces, in particular with well-known outcrops near the village Dubrivka (section Dubrivka) gives grounds to assume that the formation of a local terrace occurred during the Marine Isotopic Stages 12 to 10. Consequently, the Solonske section represents a short strati¬gra¬phic interval of the Middle Pleistocene (not the three main Pleistocene units as stated in the results of its previous study). It can be the basis for studying only a few (two to three) horizons of the glacial/interglacial rank. At the same time, it is potentially a very impor¬tant key section of the Solonske (Dubrivska, Dovhivska, Varnytska) terrace of the Pre-Dniester. The studying of Solonske outcrops makes it necessary to revise the popular notions about the origin and the age of the so-called covering stratum of the river terraces of the Carpathian Foreland and Podolian Pre-Dniester, its stratigraphic filling and significance. Key words: alluvial deposits; terraces; soil-loess sequence; Middle Pleistocene; Dniester valley; Carpathian Foreland; Solonske section.

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