Search results for " Reproduction"

Un-rooted grafted cuttings for eggplant plug-transplant production and shipping: simulated transportation and healing requirements

2019

Vegetable grafting is one of the most effective eco-friendly techniques to overcome pests and soilborne diseases in modern cropping systems of fruiting vegetables. Due to the increased farmers’ preference for grafted seedlings of high quality and better performance, the use of vegetable grafted plants is rapidly spreading and expanding over the world and intensive researches on new commercial production systems are under way. However, in many areas of the world, due to the high cost of skilled manpower, the use of grafted plug plants is still limited causing a relatively slow development of the grafting nursery industry. The aim of this work was to evaluate a possible use of un-rooted graft…

Impact of polyploidy on fertility variation of Mediterranean Arundo L. (Poaceae)

2015

International audience; Failure of seed production in the genus Arundo L. (Poaceae) is often attributed to polyploidy. This study tested the impact of two ploidy levels (2n = 12 and 18x) on the fertility of four Mediterranean Arundo. Viable pollen was screened from its production to its germination, and seed occurrence was monitored in admixture or isolated conditions. In addition, insights on restructuration of polyploid genornes were analysed using molecular cytogenetics. Our results show that high ploidy levels do not automatically induce failure of sexual reproduction. The two ploidy levels are able to produce viable pollen and seed set depending on species and cultural conditions. The …

El hipotético derecho a la reproducción

2011

RESUMENEsta comunicación analiza porqué no existe en nuestro ordenamiento ningún derecho a la maternidad o derecho a la paternidad, y cómo cuesta llegar a un consenso sobre si nuestro ordenamiento jurídico protege los derechos sexuales y reproductivos, y si lo hace, cuál es el contenido de estos derechos. Este análisis se contrasta con el debate doctrinal que si se ha producido sobre la existencia de un hipotético derecho a la reproducción, una autonomía procreativa en positivo, y la correspondiente discusión sobre su respaldo en nuestro actual ordenamiento jurídico. Debate que no se aplica en los mismos términos cuando se trata de la autonomía reproductiva en negativo, por ejemplo, en el c…

Congenital secretory diarrhoea caused by activating germline mutations in GUCY2C

2016

Objective Congenital sodium diarrhoea (CSD) refers to a form of secretory diarrhoea with intrauterine onset and high faecal losses of sodium without congenital malformations. The molecular basis for CSD remains unknown. We clinically characterised a cohort of infants with CSD and set out to identify disease-causing mutations by genome-wide genetic testing. Design We performed whole-exome sequencing and chromosomal microarray analyses in 4 unrelated patients, followed by confirmatory Sanger sequencing of the likely disease-causing mutations in patients and in their family members, followed by functional studies. Results We identified novel de novo missense mutations in GUCY2C, the gene encod…

Application of the Wood model to lactation curves of Comisana sheep

1997

Abstract Ninety-two ewes of the Comisana breed were used in a study to verify the forecasting capacity of the mathematical model proposed by Wood for fitting sheep data, and to evaluate the effect of the environmental factors affecting the parameters of the lactation curve. The Wood model underestimated the total lactation milk production with an error margin of 12.2 ± 7.8 kg of milk corresponding to 10.9 ± 6.6%. There was a strong influence of order of lambing × lambing season interaction on the lactation parameters. The curves for the winter lambing ewes demonstrated a higher peak production than autumn lambing ewes (1728.4 vs. 1082.6 g, P ≤ 0.05 for the second lambing ewes and 1772.8 vs.…

The red tooth hypothesis: A computational model of predator-prey relations, protean escape behavior and sexual reproduction

2009

This paper presents an extension of the Red Queen Hypothesis (hereafter, RQH) that we call the Red Tooth Hypothesis (RTH). This hypothesis suggests that predator-prey relations may play a role in the maintenance of sexual reproduction in many higher animals. RTH is based on an interaction between learning on the part of predators and evolution on the part of prey. We present a simple predator-prey computer simulation that illustrates the effects of this interaction. This simulation suggests that the optimal escape strategy from the prey's standpoint would be to have a small number of highly reflexive, largely innate (and, therefore, very fast) escape patterns, but that would also be unlearn…

Investigating the origin of parthenogenesis and ploidy level in Dahlica fennicella (Lepidoptera: Psychidae)

2013

The theories for the predominance of sexual reproduction predict that parthenogens should have no long-term evolutionary potential due to the lack of genetic recombination, despite short term advantages. Although parthenogenesis is rare among high order animals, true parthenogens can be found in various taxa. The intriguing question of the proliferation and persistence of parthenogenetic species needs investigation. An ideal species for such research is a parthenogenetic mont Dahlica fennicella that appears to be as equally successful as other coexisting sexual species. We investigated whether high ploidy level of D. fennnicella is due to hybridization between closely related sexual species…

Increased susceptibility to oxidative stress as a proximate cost of reproduction

2004

Despidos laborales. Fracturas sociales e identitarias

2008

The thousands of collective dismissals which have opened the beginning of the century in Spain do not just mean nearly two hundred thousand jobs (lots of them with a very long validity) and the same amount of broken life projects, but also ways of social reproduction, broken identities, institutions and social guarantees that crumble. Amazingly, these social upheavals often become eclipsed by discourses that appeal to economic considerations, the requirements of modernization or the requests of the logic of globalization. At this article, the consequences of the break of the social link intertwined along the second half of the twentieth century are investigated. For that, we have been rebui…

Sex, social reproduction, and mobile telephony as responses to precarity in urban Tanzania

2019

The gendered effects of neoliberal economic restructuring around the world are usually studied in their most dramatic forms: cross-border migration, exploitation, resistance, and violence. This chapter examines significant transformations arising from economic restructuring in the nexus between gender, labour, and urban space — transformations in which mobile technologies are deeply implicated. It explores how mobile phones are used by the poor for day-to-day survival in Tanzania’s largest city. The chapter shows how gendered economic bargains are negotiated at the very bottom of a survival economy located within the dynamics of a globalized economic system. An important characteristic of m…