758 research outputs found
Lasing in Bose-Fermi mixtures
No full textA.K. acknowledges the support from the EPSRC Established Career Fellowship. V.K., M.D., V.F.S. and A.K. acknowledge support from the Russian Ministry of Science and Education, contract (contract No. 11.G34.31.0067). P.G.S. acknowledges support from Greek GSRT program Aristeia (grant No. 1978). C.S., M. A. J.F., M.K and S.H. acknowledge support from the state of Bavaria.Light amplification by stimulated emission of radiation, well-known for revolutionising photonic science, has been realised primarily in fermionic systems including widely applied diode lasers. The prerequisite for fermionic lasing is the inversion of electronic population, which governs the lasing threshold. More recently, bosonic lasers have also been developed based on Bose-Einstein condensates of exciton-polaritons in semiconductor microcavities. These electrically neutral bosons coexist with charged electrons and holes. In the presence of magnetic fields, the charged particles are bound to their cyclotron orbits, while the neutral exciton-polaritons move freely. We demonstrate how magnetic fields affect dramatically the phase diagram of mixed Bose-Fermi systems, switching between fermionic lasing, incoherent emission and bosonic lasing regimes in planar and pillar microcavities with optical and electrical pumping. We collected and analyzed the data taken on pillar and planar microcavity structures at continuous wave and pulsed optical excitation as well as injecting electrons and holes electronically. Our results evidence the transition from a Bose gas to a Fermi liquid mediated by magnetic fields and light-matter coupling.Peer reviewe
Potassium retention in leaf mesophyll as an element of salinity tissue tolerance in halophytes
No full textAvailable online 13 October 2016Abstract not availableWilliam J. Percey, Lana Shabala, Qi Wu, Nana Su, Michael C. Breadmore, Rosanne M. Guijt, Jayakumar Bose, Sergey Shabal
Potassium homeostasis regulation inside the chloroplasts confers salt tolerance in plants
No full textSession 11 Development- abiotic interactions1 (S11p-2)Jayakumar Bose, William Percey, Steve Tyerman, Sergey Shabal
Sensing and signalling salt stress in plant roots
No full textHonghong Wu, Lana Shabala, Jayakumar Bose, Meixue Zhou, and Sergey Shabal
Salt stress sensing and early signalling events in plant roots: current knowledge and hypothesis
No full textAvailable online 14 October 2015Abstract not availableSergey Shabala, Honghong Wu, Jayakumar Bos
Read Book [PDF] Back from the Dead: Inside the Subhas Bose Mystery Full-Acces
No full textRead Or Download Back from the Dead: Inside the Subhas Bose Mystery Full Books By by Anuj Dhar (Journalist (Author), Hindustan Times) (Author)
Read Online => Read Back from the Dead: Inside the Subhas Bose Mystery
Download Book => Download Back from the Dead: Inside the Subhas Bose Mystery
Back from the Dead: Inside the Subhas Bose Mystery pdf download
Back from the Dead: Inside the Subhas Bose Mystery read online
Back from the Dead: Inside the Subhas Bose Mystery epub
Back from the Dead: Inside the Subhas Bose Mystery vk
Back from the Dead: Inside the Subhas Bose Mystery pdf
Back from the Dead: Inside the Subhas Bose Mystery amazon
Back from the Dead: Inside the Subhas Bose Mystery free download pdf
Back from the Dead: Inside the Subhas Bose Mystery pdf free
Back from the Dead: Inside the Subhas Bose Mystery pdf
Back from the Dead: Inside the Subhas Bose Mystery epub download
Back from the Dead: Inside the Subhas Bose Mystery online
Back from the Dead: Inside the Subhas Bose Mystery epub download
Back from the Dead: Inside the Subhas Bose Mystery epub vk
Back from the Dead: Inside the Subhas Bose Mystery mobi
#downloadbook #book #readonline #readbookonline #ebookcollection #ebookdownload #pdf #ebook #epub #kindl
Application of non-invasive microelectrode flux measurements in plant Stress physiology
No full textNon-invasive microelectrode flux measurement (the MIFE™ technique) is a convenient tool to study membrane-transport processes in plants in situ. Over the last 20 years, many papers have been published elucidating the critical role of membrane-transport processes in response to a variety of abiotic and biotic stresses including salinity, osmotic stress, temperature extremes, acidity, oxygen deprivation, nutritional disorders, oxidative stress, and pathogens and elicitors. In this review, we summarize some of these findings and illustrate how the application of ion-selective microelectrodes may be combined with other techniques to address some fundamental issues related to mechanisms of plant nutrient acquisition and stress signaling and adaptation.Sergey Shabala and Jayakumar Bos
Three-dimensional structure of quantized vortices in rotating Bose-Einstein condensates
No full textBose-Einstein condensates (BEC) are ideal superfluid systems to realize quantum turbulence (QT): vortex cores in BECs are larger than in superfluid Helium, making easier their observation. Recent experimental and numerical studies reported that vortex states in BEC can evolve towards a turbulent regime when an oscillatory excitation is applied. We discuss in this work how to accurately prepare initial states with vortices before running numerical simulations of QT based on the Gross-Pitaevskii equation. The case of a dense Abrikosov lattice in a fast rotating BEC is presented. High resolution numerical simulations using parallel computing are used to accurately capture physically important features of the vortices (vortex radius, inter-vortex spacing, vortex density profile)
Salicylic acid in plant salinity stress signalling and tolerance
No full textSoil salinity is one of the major environmental stresses affecting crop production worldwide, costing over $27Bln per year in lost opportunities to agricultural sector and making improved salinity tolerance of crops a critical step for sustainable food production. Salicylic acid (SA) is a signalling molecule known to participate in defence responses against variety of environmental stresses including salinity. However, the specific knowledge on how SA signalling propagates and promotes salt tolerance in plants remains largely unknown. This review focuses on the role of SA in regulation of ion transport processes during salt stress. In doing this, we briefly summarise a current knowledge on SA biosynthesis and metabolism, and then discuss molecular and physiological mechanisms mediating SA intracellular and long distance transport. We then discuss mechanisms of SA sensing and interaction with other plant hormones and signalling molecules such as ROS, and how this signalling affects activity of sodium and potassium transporters during salt stress. We argue that NPR1-mediated SA signalling is pivotal for (1) controlling Na⁺ entry into roots and the subsequent long-distance transport into shoots, (2) enhancing H⁺-ATPase activity in roots, (3) preventing stress-induced K⁺ leakage from roots via depolarisation-activated potassium outward-rectifying channel (KOR) and ROS-activated non-selective cation channels, and (4) increasing K⁺ concentration in shoots during salt stress. Future work should focus on how SA can regulate Na⁺ exclusion and sequestration mechanisms in plants.Maheswari Jayakannan, Jayakumar Bose, Olga Babourina, Zed Rengel, Sergey Shabal
Salt bladders: do they matter?
No full textSoil salinity is claiming about three hectares of arable land from conventional crop farming every minute. At the same time, the challenge of feeding 9.3 billion people by 2050 is forcing agricultural production into marginal areas, and providing sufficient food for this growing population cannot be achieved without a major breakthrough in crop breeding for salinity tolerance. In this Opinion article, we argue that the current trend of targeting Na+ exclusion mechanisms in breeding programmes for salinity tolerance in crops needs revising. We propose that progress in this area will be achieved by learning from halophytes, naturally salt-loving plants capable of surviving in harsh saline environments, by targeting the mechanisms conferring Na+ sequestration in external storage organs.Sergey Shabala, Jayakumar Bose, and Rainer Hedric
- …
