scholarly journals The effect of achene heteromorphism on germination in the shaggy soldier [Galinsoga ciliata (Rafin) S.F. Blake]

2012 ◽  
Vol 64 (1) ◽  
pp. 35-43 ◽  
Author(s):  
Magdalena Kucewicz ◽  
Aneta Wardzyńska ◽  
Anna Źróbek-Sokolnik
Keyword(s):  
Growing Season ◽  
Germination Percentage ◽  
Germination Capacity ◽  
Soil Storage ◽  
Dry Storage ◽  
Temperature Requirements ◽  
Similar Temperature ◽  
High Level ◽  
Galinsoga Ciliata ◽  
Over Time

Heteromorphic achenes are formed within each capitulum of <i>Galinsoga ciliata</i> (Rafin) S.F. Blake. We examined (1) the effects of the duration of dry storage on germination and (2) the effect of burial in soil on viability and germination of heteromorphic diaspores. Fresh harvested peripheral achenes remained dormant, while central achenes germinated at 60%. Both achene types became non-dormant after one month of dry storage. In successive months of dry storage, peripheral achenes demonstrated a higher germination percentage than central achenes. The peripheral and central achenes showed similar temperature requirements during dry storage. A similar germination pattern was observed in both achene types, with a germination peak in March (96% of peripheral achenes at 12, 26 and 34<sup>o</sup>C; 90% of central achenes at 26 and 34<sup>o</sup>C). The germination capacity deteriorated over time. After 19 months of dry storage, both achene morphs failed to germinate at 12oC. At a 26<sup>o</sup> and 34<sup>o</sup>C, the same group of achenes continued to germinate at a relatively high level. After six and seven months of soil storage, 90-95% of both achene types remained alive. Dimorphic achenes were characterized by similar germination percentage (89-99%) at all temperature intervals, whereas peripheral achenes exhumed in May were the fastest to germinate. After 18 months of storage in soil (successive growing season), most of the harvested achenes were dead. The studied achenes did not form a permanent seed bank.

The Effects of Depth and Duration of Seed Burial on Viability, Dormancy, Germination, and Emergence of Ivyleaf Speedwell (Veronica hederifolia)

2006 ◽  
Vol 20 (2) ◽  
pp. 438-444 ◽  
Author(s):  
Husrev Mennan ◽  
Bernard H. Zandstra
Keyword(s):  
Seedling Emergence ◽  
Soil Surface ◽  
Burial Depth ◽  
Triphenyltetrazolium Chloride ◽  
Primary Dormancy ◽  
Dry Storage ◽  
Winter Annual ◽  
High Level ◽  
Depth Of Burial ◽  
Over Time

Experiments were conducted to investigate the effects of depth and duration of burial on seasonal germination, primary and secondary dormancy, viability, and seedling emergence of ivyleaf speedwell (Veronica hederifoliaL.) seeds. The seeds were buried at 0, 5, 10, or 20 cm and retrieved from the field at monthly intervals. The exhumed seeds were germinated at 5 C. In the second experiment, seeds were stored in the laboratory after harvest and tested for germination at monthly intervals. In each experiment, nongerminated seeds were treated with triphenyltetrazolium chloride at monthly intervals to test their viability. The effects of stratification and burial depth on seedling emergence were observed for 1 yr. The seeds exhumed from the soil were dormant at the beginning of the experiment and exhibited dormancy/nondormancy/conditional dormancy cycling throughout the experiment. Depth of burial and time affected seed germination. Seeds retrieved from the soil surface germinated well initially, but germination decreased as depth of burial increased. In the dry storage experiment, seeds had a high level of primary dormancy, and viability decreased over time. Seedling emergence decreased when depth of burial increased. Seedlings emerged nonuniformly throughout the year and demonstrated typical winter annual characteristics.

scholarly journals Enhancing main fermentation velocities in beer by the use of a membrane bioreactor – approach and preliminary results (membrane bioreactor beer)

2018 ◽  
Vol 14 (s1) ◽  
pp. 121-131 ◽  
Author(s):  
Lisa Stumpf ◽  
Stefan Schildbach
Keyword(s):  
Membrane Bioreactor ◽  
Membrane Technology ◽  
Gas Jet ◽  
Fermentation Processes ◽  
Preliminary Results ◽  
Module Design ◽  
Continuous Basis ◽  
Membrane Flux ◽  
High Level ◽  
Over Time

The potential of the most recent membrane technology is still unaccounted for in many respects. Combining fermentation with up-to-date membrane technology building a membrane bioreactor allows the adjustment of the cell count on a high level, increasing yield per volume and time. Applied to beer manufacturing, main fermentation times of less than 20 h seem possible, avoiding the disadvantages of already known accelerated fermentation processes operated on a continuous basis. Although module design was adapted and backwash procedure altered to gas-jet, maintaining a sufficient membrane flux over time still poses a major problem. Nevertheless, preliminary results in respect of beer quality look promising.

scholarly journals Rust and leaf spot diseases on American elderberry plants

2017 ◽  
Author(s):  
◽  
Kaley Hensel
Keyword(s):  
Leaf Spot ◽  
Dry Weight ◽  
Growing Season ◽  
Significant Loss ◽  
Leaf Wetness ◽  
Conservative Estimate ◽  
Sambucus Nigra ◽  
Shoot Dry Weight ◽  
Harvest Dates ◽  
High Level

Elderberry rust (Puccinia sambuci Schewin.) Arthur (=P. bolleyana) and leaf spot diseases are frequently found in commercial American elderberry (Sambucus nigra L. subsp. canadensis L.) plantings throughout the growing season in Missouri. Thus, studies were conducted to ascertain if rust infections affect plant growth, fruiting, or berry puree quality. Rust symptoms were observed in early April at 9 to 18[degrees] C, [greater than or equal to] 3 h leaf wetness, and [greater than or equal to] 85% relative humidity. When young, potted elderberry plants averaged 3 to 6 rust pustules/plant, vegetative growth was not adversely affected. However, field-grown elderberry plants heavily infected with rust (137 pustules/cane) lost nearly twice as many leaves as controls during the growing season, indicating rust-induced defoliation. Shoot dry weight of these heavily infected canes was also 32% less than that of controls. First and last harvest dates were advanced by the high level of rust infection on 'Wyldewood' elderberry canes, but not by low pustules numbers ([less than] 6 pustules/plant) on 'Bob Gordon' or 'Ozark' plants. Similarly, berry yields were not significantly different at low infection levels, even though rust-infected 'Bob Gordon' plants had a 31% reduction in yield with an estimated $440/ha loss of income. Heavily-infected 'Wyldewood' canes had a significant loss in berry yield (47%) and potential income ($2,295/ha), assuming a conservative estimate of five canes/plan. In another study, Colletotrichum was isolated from elderberry leaf spot lesions and identified before subsequent re-inoculation of elderberry plants with this pathogen. Three species of Colletotrichum (C. salicis Funkel, C. kahawae subsp. ciggaro Wollenw., and C. aenigma C.M. Tian and Z. Li) were putatively identified as being casual agents of leaf spot indicating the diversity of species within this genus on elderberry plants.

scholarly journals Co-occurrence of Hyperacusis Accelerates With Tinnitus Burden Over Time and Requires Medical Care

2021 ◽  
Vol 12 ◽  
Author(s):  
Fatma Refat ◽  
Jakob Wertz ◽  
Pauline Hinrichs ◽  
Uwe Klose ◽  
Hesham Samy ◽  
...  
Keyword(s):  
Medical Care ◽  
Global Burden ◽  
Neural Correlate ◽  
Hearing Thresholds ◽  
Causal Therapy ◽  
Advanced Therapies ◽  
High Level ◽  
Neural Gain ◽  
Over Time

Although tinnitus represents a major global burden, no causal therapy has yet been established. Ongoing controversies about the neuronal pathophysiology of tinnitus hamper efforts in developing advanced therapies. Hypothesizing that the unnoticed co-occurrence of hyperacusis and differences in the duration of tinnitus may possibly differentially influence the neural correlate of tinnitus, we analyzed 33 tinnitus patients without (T-group) and 20 tinnitus patients with hyperacusis (TH-group). We found crucial differences between the T-group and the TH-group in the increase of annoyance, complaints, tinnitus loudness, and central neural gain as a function of tinnitus duration. Hearing thresholds did not differ between T-group and TH-group. In the TH-group, the tinnitus complaints (total tinnitus score) were significantly greater from early on and the tinnitus intensity distinctly increased over time from ca. 12 to 17 dB when tinnitus persisted more than 5 years, while annoyance responses to normal sound remained nearly constant. In contrast, in the T-group tinnitus complaints remained constant, although the tinnitus intensity declined over time from ca. 27 down to 15 dB beyond 5 years of tinnitus persistence. This was explained through a gradually increased annoyance to normal sound over time, shown by a hyperacusis questionnaire. Parallel a shift from a mainly unilateral (only 17% bilateral) to a completely bilateral (100%) tinnitus percept occurred in the T-group, while bilateral tinnitus dominated in the TH-group from the start (75%). Over time in the T-group, ABR wave V amplitudes (and V/I ratios) remained reduced and delayed. By contrast, in the TH-group especially the ABR wave III and V (and III/I ratio) continued to be enhanced and shortened in response to high-level sound stimuli. Interestingly, in line with signs of an increased co-occurrence of hyperacusis in the T-group over time, ABR wave III also slightly increased in the T-group. The findings disclose an undiagnosed co-occurrence of hyperacusis in tinnitus patients as a main cause of distress and the cause of complaints about tinnitus over time. To achieve urgently needed and personalized therapies, possibly using the objective tools offered here, a systematic sub-classification of tinnitus and the co-occurrence of hyperacusis is recommended.

scholarly journals Sequence Braiding: Visual Overviews of Temporal Event Sequences and Attributes

2020 ◽  
Author(s):  
Sara Di Bartolomeo ◽  
Yixuan Zhang ◽  
Fangfang Sheng ◽  
Cody Dunne
Keyword(s):  
Completion Time ◽  
Source Code ◽  
Good Evidence ◽  
Task Completion ◽  
Event Sequences ◽  
Sentinel Events ◽  
Temporal Events ◽  
High Level ◽  
Over Time ◽  
Temporal Event Sequences

Temporal event sequence alignment has been used in many domains to visualize nuanced changes and interactions over time. Existing approaches align one or two sentinel events. Overview tasks require examining all alignments of interest using interaction and time or juxtaposition of many visualizations. Furthermore, any event attribute overviews are not closely tied to sequence visualizations. We present SEQUENCE BRAIDING, a novel overview visualization for temporal event sequences and attributes using a layered directed acyclic network.SEQUENCE BRAIDING visually aligns many temporal events and attribute groups simultaneously and supports arbitrary ordering, absence, and duplication of events. In a controlled experiment we compare SEQUENCE BRAIDING and IDMVis on user task completion time, correctness, error, and confidence. Our results provide good evidence that users of SEQUENCE BRAIDING can understand high-level patterns and trends faster and with similar error. A full version of this paper with all appendices;the evaluation stimuli, data, and analysis code; and source code are available at osf.io/s92bu.

Corruption control and prevention in the Korean government

2018 ◽  
Vol 7 (3) ◽  
pp. 303-314 ◽  
Author(s):  
Jin-Wook Choi
Keyword(s):  
South Korea ◽  
Qualitative Analysis ◽  
Design Methodology ◽  
Institution Building ◽  
Content Type ◽  
Korean Government ◽  
Policies And Measures ◽  
Control And Prevention ◽  
High Level ◽  
Over Time

Purpose The purpose of this paper is to examine how corruption has changed over time in South Korea and to explore how the corruption control and prevention efforts of the Korean government have been successful and failed. Design/methodology/approach This paper draws on institutional theory to formulate a qualitative analysis to assess the effectiveness of anti-corruption policies and measures, and to identify the strengths and weaknesses of anti-corruption reform efforts in South Korea. Findings This paper argues that while the Korean government has been quite successful in building anti-corruption institutions to control low-level petty corruption, it has failed to institutionalize anti-corruption institutions to curb high-level grand corruption. Originality/value While many studies have attempted to identify the successful factors of fighting corruption, this paper draws a theoretical distinction between institution-building vs institutionalization to examine the success and failure of corruption control and prevention efforts in South Korea.

Prior Audit Experience and CFO Financial Reporting Aggressiveness

2021 ◽  
Author(s):  
Eric R. Condie ◽  
Kara M. Obermire ◽  
Timothy A. Seidel ◽  
Michael S. Wilkins
Keyword(s):  
Financial Reporting ◽  
Audit Fees ◽  
Chief Financial Officers ◽  
Public Accounting ◽  
Reporting Behavior ◽  
High Level ◽  
Time Away ◽  
Over Time

In this study, we investigate the financial reporting behavior of chief financial officers (CFOs) with significant prior audit experience. Our tests indicate that, on average, CFOs who were former audit managers or partners report less aggressively than CFOs without prior audit experience. Thus, the mindset that auditors develop during their time in public accounting – which should value objective, transparent, and conservative financial reporting – appears to persist when auditors take high-level positions in industry. However, we also find that the reporting behavior of prior-auditor CFOs becomes more aggressive over time as the salience of their audit experience decays. Further, we find that audit fees are lower for clients with prior-auditor CFOs but increase as the CFOs’ time away from auditing increases. Overall, our study offers important insights regarding how audit experience is associated with the financial reporting behavior of CFOs.

Introduction

2017 ◽  
Author(s):  
Lisa Westwood ◽  
Beth Laura O’Leary ◽  
Milford Wayne Donaldson
Keyword(s):  
Historic Preservation ◽  
Human Culture ◽  
Definition Of ◽  
High Level ◽  
Over Time

Chapter 1 introduces the concepts of “importance” and historic preservation at a high-level and explains the biographies of each of the authors. The included chapter outline also provides an overview of the scope and content of the book. This chapter begins with an overview and definition of human culture, and how it has changed over time. The concepts of archaeology and space archaeology are introduced within the context of place-based historic preservation and Apollo culture.

Investigating emergent coordination in small music groups

2021 ◽  
pp. 45-53
Author(s):  
Nicola Pennill ◽  
Jane W Davidson
Keyword(s):  
Mixed Methods ◽  
Longitudinal Studies ◽  
Real Life ◽  
Observational Methods ◽  
Creative Collaboration ◽  
Behavioral Interactions ◽  
Coding Schemes ◽  
High Level ◽  
Emergent Coordination ◽  
Over Time

It is people that make group music work. For researchers, this provides many interesting and diverse opportunities for study. This chapter focuses on ways in which musicians establish coordination in musical contexts with particular consideration of methods of investigation. It takes a high-level view of coordination relating to the alignment of ideas, intentions, and actions in creative collaboration processes. It outlines observational methods for real-life contexts, coding schemes for group behaviors, and the increased employment of mixed-methods that observe and measure interaction in lab and ecological settings. The chapter closes with a consideration of the relevance of longitudinal studies of ensembles that showcase emergent coordination, and an example is offered of an investigation of the development of behavioral interactions over time in two vocal quintets.

Introduction

2005 ◽  
Author(s):  
Patricia Albjerg Graham
Keyword(s):  
Academic Achievement ◽  
Racial Segregation ◽  
Academic Learning ◽  
School Practices ◽  
The Past ◽  
The Social ◽  
Musical Scores ◽  
American Children ◽  
High Level ◽  
Over Time

Schools in America have danced to different drummers during their long history. Sometimes the drumbeat demanded rigidity in all programs; sometimes it wanted academic learning for only a few. Sometimes it encouraged unleashing children’s creativity, not teaching them facts. Sometimes it wanted children to solve the social problems, such as racial segregation, adults could not handle. Sometimes it tacitly supported some schools as warehouses, not instructional facilities. Sometimes it sought schooling to be the equalizer in a society in which the gap between rich and poor was growing. Sometimes the principal purpose of schooling seemed to be teaching citizenship and developing habits of work appropriate for a democratic society, while at other times its purpose seemed to be preparation for employment, which needed the same habits of work but also some academic skills. Now, the drumbeat demands that all children achieve academically at a high level and the measure of that achievement is tests. The rhythm and tempo of the drumbeats have shifted relatively frequently, but the schools have not adjusted to the new musical scores with alacrity. They are typically just beginning to master the previous drummers’ music when new drummers appear. Many, though not all, of the new beats have been improvements both for the children and for the nation. All drummers have sought literacy in English for American children, though very modest literacy levels have been acceptable in the past. Drummers have always sought a few students who attained high levels of academic achievement, including children from disparate social, economic, and racial backgrounds. Beyond that consensus, however, what we have wanted from schooling has changed dramatically over time. These expectations for schools typically have been expressed through criticisms—often virulent—of current school practices, and the responses that followed inevitably were slower and less complete than the most ardent critics demanded. These are the shifting assignments given to schools. The following chapters of this book describe these shifting assignments given to schools and then to colleges during the last century: “Assimilation: 1900– 1920”; “Adjustment: 1920–1954”; “Access: 1954–1983”; and “Achievement: 1983–Present.”

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