The influence of ammonium tetrafluoroborate and ammonium hexafluorophosphate on selected weed species – inhibition of growth and change the content of photosynthetic pigments in plants

2016 ◽  
Vol 19 ◽  
pp. 19-27
Author(s):  
Barbara Pawłowska ◽  
Robert Biczak
Keyword(s):  
Photosynthetic Pigments ◽  
Weed Species ◽  
Inhibition Of Growth ◽  
Growth And Change ◽  
Ammonium Hexafluorophosphate

Herbicidal properties of alpha-terthienyl, a naturally occurring phototoxin

1991 ◽  
Vol 71 (1) ◽  
pp. 215-218 ◽  
Author(s):  
J. D. H. Lambert ◽  
Glenn Campbell ◽  
J. T. Arnason ◽  
W. Majak
Keyword(s):  
Growth Inhibition ◽  
Key Words ◽  
Field Trials ◽  
Weed Species ◽  
Inhibition Of Growth ◽  
Naturally Occurring ◽  
Broad Leaf

The herbicidal efficacy of alpha-terthienyl (α-T), a naturally occurring phototoxin, was investigated in pot and field trials. The phototoxin acted as a contact herbicide on corn and broad leaf weeds and produced necrotic lesions under solar or solar-simulating illumination. In comparison to currently used herbicides such as atrazine, the efficacy of α-T for growth inhibition of the weed species was low with 50% inhibition of growth at 15 to 29 kg ha−1. Key words: Alpha-terthienyl, phototoxin, herbicide, corn, weeds

scholarly journals Biological activity of Arum Cyreniacum (Araceae) and potential use as Bioherbicide

2021 ◽  
pp. 58-67
Author(s):  
Ahlam K Alaila ◽  
Sami M Salih ◽  
Ahmed A Abdulrraziq
Keyword(s):  
Biological Activity ◽  
Hordeum Vulgare ◽  
Photosynthetic Pigments ◽  
Growth Parameters ◽  
Dry Weight ◽  
Nutrient Content ◽  
Germination Percentage ◽  
Weed Species ◽  
Crop Species ◽  
Negative Effect

The present investigation aims was carried out to study the biological activity of aqueous extract and shoot crude powder of Arum cyreniacum (ACSAE and ACSCP) on some germination and growth parameters (germination bioassay experiment) besides major physiological, and biochemical processes (pot experiment) In Hordeum vulgare (crop species) and Phalaris minor (weed species) of different concentrations of A. cyreniacum on germination percentage (GP), coleoptile (CL) and radicle (RL) lengths, seedling shoot and root length seedling fresh and dry weight, some nutrients (N, K, Na, Cu, Fe, and Ni ), and photosynthetic pigments .Generally, the effect of the all concentrations levels of the extract on (GP), (CL) and (RL) on H. vulgare seeds was ineffectively decreased with increasing the concentrations of A. cyreniacum while the percentage was significantly decreased with increasing the concentrations of the with P. minor. All concentrations levels of the extracts reduced coleoptile (CL) and radicle (RL) lengths of H. vulgare. Likewise, the reduction in the two parameters was documented in P. minor. Were more affected in P. minor compared to H. vulgare. There was a significant within the concentration of micronutrients as well as the entire photosynthetic color substance of P. minor seedlings grown in ACSCP. Treatment with ACSCP had a more negative effect on total nitrogen in P. minor than on H. vulgare. Keywords: R Hordeum Vulgare; Growth Parameters; Nutrient Content; Photosynthetic Pigments

scholarly journals Allelopathic effect of buckwheat extract for seedlings of selected weed species

2020 ◽  
Vol 74 (4) ◽  
pp. 83-93
Author(s):  
MAGDALENA SZWED ◽  
JOANNA MITRUS ◽  
MARCIN HORBOWICZ
Keyword(s):  
Shoot Growth ◽  
Allelopathic Effect ◽  
Metabolic Reaction ◽  
Wild Oat ◽  
Weed Species ◽  
Galium Aparine ◽  
Inhibition Of Growth ◽  
Seedling Roots ◽  
Setaria Glauca ◽  
Fagopyrum Esculentum Moench

The influence of 1% aqueous extract obtained from a 14-day plants of common buckwheat (Fagopyrum esculentum Moench) on weed species was evaluated. Seedling roots of wild oat (Avena fatua L.), yellow foxtail (Setaria glauca L.), barnyardgrass (Echinochloa crus galli (L.) P. Beauv.), common windgrass (Apera spica-venti (L.) P. Beauv.), catchweed bedstraw (Galium aparine L.), scentless mayweed (Matricaria inodora L), gallant soldier (Galinsoga parviflora Cav.) and tiny vetch (Vicia hirsuta L.) were exposed to buckwheat extract and compared with control plants grown in water. The obtained results show that the buckwheat extract had lower influence on the growth of shoot than on roots of the evaluated weed species. The use of buckwheat extract in the medium caused the inhibition of root growth in all species except from tiny vetch. In the case of shoot of weeds, inhibition of growth by buckwheat extract occurred only in wild oat. Whereas in yellow foxtail, scentless mayweed and tiny vetch, the stimulation of shoot growth was demonstrated. These results may indicate that the buckwheat extracts act on directly exposed tissues. A different metabolic reaction of wild oat to buckwheat extract after 5 days of exposure than after 2 days may indicate a quick adaptation of wild oat seedlings to stressful conditions.

Meanings of burnout and resilience in Ontario dietitians

2012 ◽  
Vol 1 (2) ◽  
pp. 13-20
Author(s):  
Yuka Asada
Keyword(s):  
Job Stress ◽  
Professional Growth ◽  
Maslach Burnout Inventory ◽  
Professional Relationships ◽  
Contributing Factors ◽  
Dietetic Education ◽  
Body Of Knowledge ◽  
Growth And Change ◽  
And Training ◽  
Preventative Approach

  ABSTRACT   Objectives: Although experiences of burnout are well documented among some health professionals, there is limited research that explores similar experiences among dietitians. This study aims (1) to describe the varied qualitative dimensions of burnout that are particular to dietitians and (2) to identify the factors that might be deemed protective against burnout. Methods: Fourteen dietitians were recruited from a larger quantitative study that assessed prevalence of burnout in Ontario, Canada using the Maslach Burnout Inventory (MBI). Those who completed the MBI were invited to participate in two phenomenological interviews. Transcribed interviews were analyzed by naïve readings and identified meaning units with a larger team for increased rigor and trustworthiness. Results: Dietitians describe burnout as having bodily and overall health consequences. Both social/professional relationships and dietitians’ passion for their work contributed to experiences of burnout and resilience. Opportunities for continued professional growth and change were contributing factors for resilience. Implications & Conclusions: This study contributes to the limited body of knowledge on dietitians’ lived experiences of burnout and resilience. The findings have implications for those involved in the education and training of student dietitians, and for those in a position to offer support to dietitians who are struggling with job stress. In the context of fostering resilience, a preventative approach to dietetic education is explored with the intention to protect future practitioners from burnout.

The Garden as Unfinished Narrative of the Good in C.S. Lewis’ Perelandra

2012 ◽  
Vol 2 (1) ◽  
pp. 49-80
Author(s):  
Evrea Ness-Bergstein
Keyword(s):  
The Novel ◽  
Garden Of Eden ◽  
Adam And Eve ◽  
Dead End ◽  
Growth And Change ◽  
Literary Devices ◽  
Hortus Conclusus

In Lewis’ transposition of Milton’s Paradise to a distant world where Adam and Eve do not succumb to Satan, the structure of Eden is radically different from the enclosed garden familiar to most readers. In the novel Perelandra (1944), C.S. Lewis represents the Garden of Eden as an open and ‘shifting’ place. The new Garden of Eden, with Adam and Eve unfallen, is a place of indeterminate future, excitement, growth, and change, very unlike the static, safe, enclosed Garden—the hortus conclusus of traditional iconography—from which humanity is not just expelled but also, in some sense, escapes. The innovation is not in the theological underpinnings that Lewis claims to share with Milton but in the literary devices that make evil in Perelandra seem boring, dead-end, and repetitive, while goodness is the clear source of change and excitement.

DIFFERENCES IN GROWTH AND THYROID FUNCTION OF PEKIN AND MUSCOVY DUCKS EITHER UNTREATED OR TREATED WITH STILBOESTROL

1965 ◽  
Vol 50 (3) ◽  
pp. 411-417 ◽  
Author(s):  
Hans von Faber ◽  
Wolfgang Häussermann
Keyword(s):  
Thyroid Function ◽  
Pekin Ducks ◽  
Inhibition Of Growth ◽  
Marked Inhibition ◽  
Muscovy Ducks ◽  
Effect On Growth

ABSTRACT Pekin ducks grow faster and show a faster and higher thyroidal 131I uptake than Muscovy ducks. Treatment with a total of 15 mg stilboestrol during the first 4 weeks had no effect on growth, thyroid weight or thyroidal 131I uptake in male or female Pekin ducklings. In male Muscovy ducklings the same treatment caused a marked inhibition of growth, a decrease in thyroid weight and a lowered thyroidal 131I uptake. Thyroxine, administered simultaneously in physiological doses, did not prevent inhibition of growth. It is therefore concluded that this inhibition is not due to the lowered thyroid function.

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