Hardseededness in annual clovers: variation between populations from wet and dry environments

2002 ◽  
Vol 53 (7) ◽  
pp. 821 ◽  
Author(s):  
Hayley C. Norman ◽  
Philip S. Cocks ◽  
Nick W. Galwey

Annual legumes rely on hardseededness, a form of seed dormancy, to spread the risk of mortality associated with germination and to encourage germination at the optimal time in a season. This paper examines seed softening strategies of a number of clover (Trifolium) species collected over a range of environments. Three hypotheses are tested. The first is that within species, long-term hardseededness increases with aridity due to the greater chance of failure to reproduce in dry environments. It is tested by comparing seed softening patterns of populations of a number of clover species collected from a range of environments. The second hypothesis, that annual legumes from dry environments have a smaller subset of seed softening strategies than legumes from wetter environments, is tested by comparing the range of seed softening patterns from all species found at collection sites. The third hypothesis is that within-year patterns of seed softening that prevent germination after summer rainfall may partially substitute for long-term hardseededness. It is tested by examining the relationship between within-year hardseededness and between-year hardseededness. Accessions of the same species from different collection sites differed in both within-year pattern of seed softening and long-term hardseededness but there was little evidence that these differences were between ecotypes. Different species from the same collection site did not have similar seed softening strategies, and seed softening strategies of clovers from dry sites were as variable as those from wetter environments. Within-year pattern of seed softening does not appear to substitute for between-year hardseededness as a dormancy strategy.

2009 ◽  
Vol 364 (1536) ◽  
pp. 3755-3771 ◽  
Author(s):  
Prahlad Gupta ◽  
Jamie Tisdale

Word learning is studied in a multitude of ways, and it is often not clear what the relationship is between different phenomena. In this article, we begin by outlining a very simple functional framework that despite its simplicity can serve as a useful organizing scheme for thinking about various types of studies of word learning. We then review a number of themes that in recent years have emerged as important topics in the study of word learning, and relate them to the functional framework, noting nevertheless that these topics have tended to be somewhat separate areas of study. In the third part of the article, we describe a recent computational model and discuss how it offers a framework that can integrate and relate these various topics in word learning to each other. We conclude that issues that have typically been studied as separate topics can perhaps more fruitfully be thought of as closely integrated, with the present framework offering several suggestions about the nature of such integration.


1992 ◽  
Vol 72 (3) ◽  
pp. 931-936 ◽  
Author(s):  
Darryl G. Stout ◽  
S. N. Acharya ◽  
H. C. Huang ◽  
M. R. Hanna

Single plants of 12 alfalfa (Mediccigo sativa L.) cultivars, chosen to represent a range of winter hardiness and resistance to verticillium wilt (Verticillium albo-atrum), were space planted to determine the time of plant death during the year. Plant mortality was assessed in spring and fall for three consecutive years. The relationship between plant survival during summer or winter and the cultivars’ resistance to verticillium wilt or fall growth was examined. During the first 2 yr of this field study, natural mortality during both summer and winter ranged from 1.0 to 2.1%. But by the third year an average of 9% of the plants died during the summer. Survival during the third summer was correlated (r = 0.76, P = 0.004) with the veritcillium wilt resistance measured using a greenhouse screening test, but was not correlated with fall growth of the cultivars. During the third winter, plant death for all cultivars averaged 67%. Survival of a cultivar during the winter was negatively correlated (r = −0.84, P = 0.001) with its fall growth, but not with its verticillium wilt resistance. These results indicate that programs to develop alfalfa cultivars with long-term persistence in the interior region of British Columbia should include both fall growth and verticillium wilt resistance in their selection criteria.Key words: Verticillium wilt, winter injury, fall dormancy, winter hardiness, stand persistence


2021 ◽  
Vol 5 (4) ◽  
pp. 349
Author(s):  
Ervina Puspa Wahyu Angesti ◽  
Nining Febriyana

Background: 107,000 pregnant women in Indonesia experiencing anxiety while facing childbirth. A Research shows that anxiety is more experienced in Primigravida's pregnant women. Pregnant women anxiety can arise, especially in the third trimester until delivery. During the COVID-19 pandemic, pregnant women feel increasingly anxious because the virus spreads relatively easily. This study was aimed to analyze the relationship between the anxiety level and knowledge of pregnant women in the third trimester with readiness to face childbirth during the COVID-19 pandemic in Puskesmas Benowo and Tenggilis. Methods: This type of research was observational analytic with a cross-sectional design. The number of samples was 76 third trimester pregnant women suitable the criteria that is primigravida, physiologic pregnancy, not in a long-term medication and willing to be a respondent. The sampling technique was purposive sampling. The data was analyzed with Spearman’s Statistic test. Results: as many as 57.5% of respondents had severe anxiety with low readiness for childbirth and good knowledge of COVID-19. It was caused by the drug or vaccine for the Covid-19 that had not been found, and made pregnant women even more anxious and feared of something unwanted happening. Anxiety of pregnant women who were about to give birth greatly affected the readiness of the mother in preparing for childbirth, the more anxious pregnant women were, the less they would be prepared for laboring. The statistic analyze says that There was a relationship between the level of anxiety of third trimester pregnant women with readiness to give birth during the COVID-19 pandemic (p = 0.00), there was a relationship between the knowledge level with readiness to give birthd during the COVID-19 pandemic p = 0.012). Conclusion: There is a relationship between the Anxiety Level and Knowledge of Pregnant Women in the third trimester with Readiness for Childbirth during the COVID-19 Pandemic  


2010 ◽  
Vol 12 (2) ◽  
pp. 202-208 ◽  
Author(s):  
Christopher Hill

Questions have arisen as to the manner of the publication on 9 November 2009 of Anglicanorum coetibus, the Apostolic Constitution Providing for Personal Ordinariates for Anglicans Entering into Full Communion with the Catholic Church. What is clear is that the views of the Pontifical Council for Promoting Christian Unity, under Cardinal Walter Kasper, were given less weight than ought to be expected and that both the Archbishop of Canterbury and the Archbishop of Westminster were informed at only a late stage. More assuring for the long term, Cardinal Kasper has stated that this provision is not a new form of ecumenism. Significantly, the Vatican statement following the meeting between the Archbishop of Canterbury and Pope Benedict XVI in Rome on 21 November reiterated ‘the shared will to continue and consolidate’ the relationship between the Roman Catholic Church and the Churches of the Anglican Communion and noted approvingly that the details of the third phase of ARCIC would be discussed at informal talks with Anglican representatives in the days following the Archbishop's visit to the Pope. Whatever else the Ordinariate may be, it is not a substitute for that ‘serious dialogue’ established by Archbishop Michael Ramsey and Pope Paul VI which has as its continued goal, despite obstacles ancient and modern, the restoration of ‘complete communion of faith and sacramental life’ between us.


2021 ◽  
Vol 27 ◽  
pp. 107602962199212
Author(s):  
Ting Yang ◽  
Hongfei Jing ◽  
Yungang Cao ◽  
Xianda Lin ◽  
Jueyue Yan ◽  
...  

To investigate the relationship of different subtypes of intracerebral hemorrhage (ICH) to early disease evolution and long-term prognosis in patients with acute cerebral infarction after intravenous recombinant tissue plasminogen activator(r-tPA). Seventy ischemic stroke patients treated with intravenous r-tPA who underwent computed tomography (CT) within 24 hours after thrombolysis were divided into 4 types (hemorrhagic infarction type 1 [HI-1], HI-2, parenchymal hemorrhage type 1 [PH-1], or PH-2 which according to the size of the hematoma and the presence or absence of space-occupying effect). Early evolution of the disease was observed by the change in the National Institutes of Health Stroke Scale (NIHSS) score within 24 hours after thrombolysis. The long-term prognosis was assessed by the modified Rankin Scale (mRS) score at the third month. There were 17 (24.3%) patients with ICH. Compared with patients in the non-ICH group, HI did not affect early neurological function or clinical outcome at the third month. PH-1 did not increase the risk of early neurological deterioration; however, PH-1 has a tendency to increase the risk of death at the third month (50% vs 11.3%, P = 0.090). PH-2 was significantly related to early neurological deterioration (66.7% vs 3.8%, P < 0.001) and mortality at the third month (50.0% vs 11.3%, P = 0.040). Patients with different subtypes of ICH after thrombolysis have different clinical outcomes. PH-2 is significantly associated with early neurological deterioration and increases mortality at the third month.


Author(s):  
David Haines

This chapter explores the surge in pelagic whaling in the nineteenth century and how it contributed to globalisation. It examines the contact between European empires and indigenous Pacific island communities and the relationship between the whaling industry and European expansionism. It is divided into four parts: the first reviews whaling historiography; the second examines the origin of the Pacific whaling industry and its international components; the third examines the impact of whaling on Pacific island communities; and the fourth uses case studies exploring the impact from New Zealander and Hawaiian perspectives. It concludes that the whaling industry had a relatively minor long-term impact on globalisation - bar the depletion of whale stock, but an enormous overall impact on the furthering of European expansionism.


1994 ◽  
Vol 74 (3) ◽  
pp. 329-363 ◽  
Author(s):  
GERALD G. GAES

This article reviews prison crowding research. In the first section, the legal, political, and social context of prison crowding is evaluated. The second section explores the relationship between crowding and violence. It is argued that most prison crowding studies do not investigate intervening mechanisms that may account for a relationship between crowding and violence, if and when a relationship is found. Furthermore, it is suggested that one reason for the inconsistency in the results of such studies is that researchers have failed to examine the proximal causes of violence as well as the formal mechanisms prison administrators use to control or limit violence. In the third section, I reexamine the evidence on the most consistent finding in the crowding and health area, that dormitories are associated with higher illness reporting rates than are other types of housing. I conclude that this finding is probably an artifact of selection bias. Furthermore, illness reporting is the result of a complex set of circumstances that is affected as much by psychological and sociological causes as by the health status of the inmate. Despite the prevailing sentiments about the harmful effects of crowding, there is little consistent evidence supporting the contention that short- or long-term impairment of inmates is attributable to prison density. The purported consistency of findings is challenged in the fourth section. One reason for the lack of consistency may be that researchers have failed to consider management interventions under periods of high confinement and have failed to account for conditions other than crowding that affect inmate debilitation.


Author(s):  
S. A. Lysenko ◽  
V. F. Loginov

The article analyzes the relationship between the forest cover and the amount of summer rainfalls in Belarus. We found that the spatial structure of the long-term precipitation field in Belarus is largely explained by the spatial features of its forest cover. In particular, the high forest cover in summer time provides 5–15 % more rain falls than that without forest. We also showed that the extremely dry period from 2014 to 2015 led to a significant transformation of the summer rainfall field. As a result, the field becomes almost the mirror opposite to the summer air temperature field. This indicates the important role of local evaporation in the formation of precipitation in the summer months. The important conclusion of the results is that additional forest stands are needed to prevent a further decrease in the level of surface and ground waters in Belarus. We also need to increase the use of agroforestry techniques in crop cultivation.


2018 ◽  
pp. 144-189
Author(s):  
Susannah Crowder

Two male monasteries – and their roles in the religious observances of laywomen – illuminate another facet of the relationship among gender, devotion, and performance in Metz. This chapter first revisits the Celestine community, deepening the findings of the third chapter by examining the institution that housed the family chapel of the Gronnaix and the burial place of Catherine Baudoche. Its spaces reveal a culture of performance that was grounded in women’s material contributions and spiritual needs; contemporary institutional histories construct a performance “edifice” that depicts the partnership of laywomen and the Celestine brothers. A second Messine religious community documents an alternative perspective on the role of women in long-term history-making and performance practice. Through liturgical performance, the monastery of St-Arnoul had claimed a past that tied Carolingian-era imperial identity to female sanctity and patronage. Catherine Gronnaix’s foundation of masses at St-Arnoul took place during the decline of this institutional narrative, however, when the preservation and appropriation of older traditions of female performance had lost appeal. In distinct eras, the cloistered spaces of St-Martin and St-Arnoul – both permeated by the presence and remains of laywomen and their devotions – sheltered collaborative performances that intertwined monastic and familial aspirations.


2012 ◽  
Vol 23 (1) ◽  
pp. 86-101
Author(s):  
Anna Lipka

The paper, inspired by a long-term client-company relationship model, highlights the components of a model of loyalty relationships between an employee (an internal client) and an organisation. The study aims to present a relatively complete specification of antecedents (the first component of the model), i.e. the determinants of an effective relationship, understood as a long-term bond benefiting both parties. The antecedents include the type of loyalty strategy applied by the company, the drivers behind loyalty and the spread of multi-loyalty among employees. Next, the paper identifies the determinants of the relationship (the second component of the model), including, e.g. the type of employees’ loyalty. The third component of the model looks at the results of the relationship, such as the level of loyalty risk in the organization and its implications, e.g. in the form of (incomplete) employee buy-in and productivity losses. Empirical verification of the model would be advantageous.


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