scholarly journals Seed germination and rising atmospheric CO2concentration: a meta-analysis of parental and direct effects

2014 ◽  
Vol 202 (2) ◽  
pp. 401-414 ◽  
Author(s):  
Charles Marty ◽  
Hormoz BassiriRad
Keyword(s):  
Seed Germination ◽  
Meta Analysis ◽  
Direct Effects

scholarly journals Direct effects of nitrogen addition on seed germination of eight semi‐arid grassland species

2020 ◽  
Vol 10 (16) ◽  
pp. 8793-8800
Author(s):  
Tong Zhang ◽  
Mengzhou Liu ◽  
Xudong Huang ◽  
Wei Hu ◽  
Ning Qiao ◽  
...  
Keyword(s):  
Seed Germination ◽  
Nitrogen Addition ◽  
Direct Effects ◽  
Grassland Species ◽  
Semi Arid

Platelet Function in CKD: A Systematic Review and Meta-Analysis

2021 ◽  
pp. ASN.2020101440
Author(s):  
Constance C.F.M.J. Baaten ◽  
Marieke Sternkopf ◽  
Tobias Henning ◽  
Nikolaus Marx ◽  
Joachim Jankowski ◽  
...  
Keyword(s):  
Systematic Review ◽  
Platelet Aggregation ◽  
Platelet Function ◽  
Ex Vivo ◽  
Platelet Reactivity ◽  
Meta Analysis ◽  
Uremic Toxins ◽  
Extensive Literature ◽  
Direct Effects ◽  
Platelet Activity

BackgroundPatients with CKD are at high risk for thrombotic and hemorrhagic complications. Abnormalities in platelet function are central to these complications, but reports on platelet function in relation to CKD are conflicting, and vary from decreased platelet reactivity to normal or increased platelet responsiveness. The direct effects of uremic toxins on platelet function have been described, with variable findings.MethodsTo help clarify how CKD affects platelet function, we conducted a systematic review and meta-analysis of platelet activity in CKD, with a focus on nondialysis-induced effects. We also performed an extensive literature search for the effects of individual uremic toxins on platelet function.ResultsWe included 73 studies in the systematic review to assess CKD’s overall effect on platelet function in patients; 11 of them described CKD’s effect on ex vivo platelet aggregation and were included in the meta-analysis. Although findings on platelet abnormalities in CKD are inconsistent, bleeding time was mostly prolonged and platelet adhesion mainly reduced. Also, the meta-analysis revealed maximal platelet aggregation was significantly reduced in patients with CKD upon collagen stimulation. We also found that relatively few uremic toxins have been examined for direct effects on platelets ex vivo; ex vivo analyses had varying methods and results, revealing both platelet-stimulatory and inhibitory effects. However, eight of the 12 uremic toxins tested in animal models mostly induced prothrombotic effects.ConclusionsOverall, most studies report impaired function of platelets from patients with CKD. Still, a substantial number of studies find platelet function to be unchanged or even enhanced. Further investigation of platelet reactivity in CKD, especially during different CKD stages, is warranted.

How do primates affect seed germination? A meta-analysis of gut passage effects on neotropical plants

Oikos ◽  
2016 ◽  
Vol 125 (8) ◽  
pp. 1069-1080 ◽  
Author(s):  
Lisieux F. Fuzessy ◽  
Tatiana G. Cornelissen ◽  
Charles Janson ◽  
Fernando A. O. Silveira
Keyword(s):  
Seed Germination ◽  
Meta Analysis ◽  
Gut Passage ◽  
Neotropical Plants

scholarly journals The seed germination spectrum of alpine plants: a global meta‐analysis

2020 ◽  
Author(s):  
Eduardo Fernández‐Pascual ◽  
Angelino Carta ◽  
Andrea Mondoni ◽  
Lohengrin A. Cavieres ◽  
Sergey Rosbakh ◽  
...  
Keyword(s):  
Seed Germination ◽  
Meta Analysis ◽  
Alpine Plants

Order of Entry and Business Performance: An Empirical Synthesis and Reexamination

1995 ◽  
Vol 59 (4) ◽  
pp. 17-33 ◽  
Author(s):  
David M. Szymanski ◽  
Lisa C. Troy ◽  
Sundar G. Bharadwaj
Keyword(s):  
Market Share ◽  
Business Performance ◽  
Meta Analysis ◽  
Direct Effects ◽  
Contingency Analysis ◽  
Market Strategy ◽  
Order Of Entry ◽  
Contingency Perspective ◽  
Pioneering Advantage ◽  
Managerial Implications

One stream of research for order of entry effects focuses on the possibility that the order of entry exerts a direct impact on business performance. A second stream of research, the contingency perspective, debates the merits of whether the order of entry, in combination with other market strategy and marketplace variables, is what actually drives business performance. The findings from studies focusing on possible direct effects offer only mixed evidence in favor of a pioneering advantage. The contingency perspective, however, has not been subjected to systematic, empirical scrutiny. Against this backdrop, the authors conduct a meta-analysis of the pioneering-market share findings and an examination of the contingency perspective of order of entry effects. The findings from the meta-analysis reveal that, on average, earlier entry is associated with greater market share. The findings from the contingency analysis, however, offer evidence suggesting that the contingency perspective is the more valid perspective for capturing the association between order of entry and market share. The authors discuss the theoretical and managerial implications of their findings and several directions for further research.

Influence of nitrogen on germination and early development of broomrape (Orobanchespp.)

Weed Science ◽  
1999 ◽  
Vol 47 (1) ◽  
pp. 2-7 ◽  
Author(s):  
James H. Westwood ◽  
Chester L. Foy
Keyword(s):  
Seed Germination ◽  
Early Development ◽  
Nitrogen Fertilizers ◽  
Direct Effects ◽  
Crop Species ◽  
Ammonium Toxicity ◽  
Similar Treatment ◽  
Treatment Conditions ◽  
Germinating Seeds

Broomrapes are parasitic angiosperms that live on the roots of many important crop plants. We have conducted a series of in vitro experiments to investigate the direct effects of nitrogen fertilizers on broomrape seed germination and early development. These experiments confirm that nitrogen in the ammonium form is more inhibitory than nitrate, but we conclude that it is the elongation of the seedling radicle that is primarily inhibited by ammonium, rather than the seed germination itself. Reductions in radicle length were observed when ammonium solutions were applied during either preconditioning or germination periods. For germinating seeds, exposures to ammonium sulfate of 4 to 8 h (depending on the species) reduced radicle elongation by half, indicating a relatively rapid inhibition. Broomrape species varied in sensitivity to ammonium, withOrobanche aegyptiacabeing the most tolerant, followed byO. crenata, O. ramosa, O. cernua, and finallyO. minoras compared in the presence of 5 mM ammonium. However, all broomrape species were much more sensitive to ammonium toxicity than were host crop species under similar treatment conditions.

Crossbreeding in beef production: meta-analysis of breed means to estimate breed-specific effects on leather properties

2017 ◽  
Vol 57 (5) ◽  
pp. 811
Author(s):  
M. D. MacNeil ◽  
M. M. Scholtz ◽  
A. Theunissen ◽  
J. F. De Bruyn ◽  
F. W. C. Neser
Keyword(s):  
Maternal Effects ◽  
Crack Extension ◽  
Production Systems ◽  
Meta Analysis ◽  
Direct Effects ◽  
Beef Production ◽  
Appropriate Use ◽  
Subsistence Level ◽  
Specific Effects ◽  
Yield And Quality

The objective of this study was to discern opportunities for improving leather-making properties of hides originating from beef production systems based on indigenous Afrikaner cattle via crossbreeding. Data were previously unpublished breed means from purebred Afrikaner, Brahman, Charolais, Hereford and Simmental, top-crosses of Brahman, Charolais, Hereford, and Simmental sires on (1) Afrikaner dams producing F1 progenies and (2) Brahman × Afrikaner, Charolais × Afrikaner, Hereford × Afrikaner, and Simmental × Afrikaner F1 females producing both backcross and three-breed cross progenies. Hide yield (%), leather yield (dm2/kg), force 20% extension (Mpa), extension grain crack (%), extension break (%), force break (Mpa), slit tear force (N/mm), distension grain crack (%), and force grain crack (N/mm) were evaluated. Breed direct effects and individual heterosis, but not maternal effects, may be important for most of these traits. Direct effects due to the exotic breeds reduced hide yield but generally improved leather properties relative to the indigenous Afrikaner. For both hide and leather yields, individual heterosis effects arose primarily from indicus × taurus crosses with the Hereford × Brahman effect being most pronounced. Thus, there may be opportunities to improve leather yield and quality through crossbreeding relative to the straightbred Afrikaner. A top-cross mating plan may be recommended to enhance production by subsistence level farmers having access to Afrikaner females, provided that management can ensure appropriate use of the terminal sires.

Sign in / Sign up

Export Citation Format

Share Document