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Institution

Polytechnic University of Valencia

EducationValencia, Spain
About: Polytechnic University of Valencia is a education organization based out in Valencia, Spain. It is known for research contribution in the topics: Catalysis & Population. The organization has 16282 authors who have published 40162 publications receiving 850234 citations.


Papers
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Journal ArticleDOI
TL;DR: A coherent explanation for all Ppz‐dependent phenotypes is provided and evidence for a causal relationship between intracellular cation homeostasis and a potential cell cycle checkpoint is provided.
Abstract: The yeast Ppz protein phosphatases and the Hal3p inhibitory subunit are important determinants of salt tolerance, cell wall integrity and cell cycle progression. We present several lines of evidence showing that these disparate phenotypes are connected by the fact that Ppz regulates K+ transport. First, salt tolerance, cell wall integrity and cell cycle phenotypes of Ppz mutants are dependent on the Trk K+ transporters. Secondly, Ppz mutants exhibit altered activity of the Trk system, as measured by rubidium uptake. Thirdly, Ppz mutants exhibit altered intracellular K+ and pH, as expected from H+ efflux providing electrical balance during K+ uptake. Our unifying picture of Ppz phenotypes contends that activation of Trk by decreased Ppz activity results in plasma membrane depolarization (reducing uptake of toxic cations), increased intracellular K+ and turgor (compromising cell integrity), and increased intracellular pH (augmenting the expression of pH-regulated genes and facilitating α-factor recovery). In addition to providing a coherent explanation for all Ppz-dependent phenotypes, our results provide evidence for a causal relationship between intracellular cation homeostasis and a potential cell cycle checkpoint.

144 citations

Journal ArticleDOI
TL;DR: It is demonstrated that several melon phloem proteins have a wide RNA-binding activity, and the possible involvement of these phloems proteins in the long-distance transport of melon RNAs is discussed.
Abstract: *† Summary Phloem proteins (P-proteins) are an enigmatic group of proteins present in most angiosperm species. The best characterized P-proteins (PP1 and PP2) are synthesized in companion cells, transported into sieve elements via pore plasmodesmata and translocated through the plant. Characteristics such as long-distance translocation, RNA-binding activity and capacity of increasing plasmodesmata exclusion size suggest that certain phloem proteins could be involved in RNA transport within the plant, forming translocatable ribonucleoprotein complexes with endogenous or pathogenic RNAs. Long-distance movement of RNA through the phloem is a process known to occur, but both the mechanisms involved and the components constituting this potential information network remain unclear. Here, we demonstrate that several melon phloem proteins have a wide RNA-binding activity. Serological assays strongly suggest that one of these proteins is the melon phloem protein 2 (CmmPP2). Mass spectrometry analysis undoubtedly identifies another one as the recently characterized melon phloem lectin (CmmLec17). Grafting experiments demonstrate that the CmmLec17 is a translocatable phloem protein, able to move through intergeneric grafts from melon to pumpkin. Translocatability and RNA-binding activity was also demonstrated for an uncharacterized protein of approximately 14 kDa. In light of these results the possible involvement of these phloem proteins in the long-distance transport of melon RNAs is discussed.

144 citations

Journal ArticleDOI
TL;DR: It is demonstrated the presence of Dirac cones in the dispersion relation of acoustic waves propagating on the surface of a plate of methyl methacrylate containing a honeycomb lattice of cylindrical boreholes, which represents the acoustic analogue of graphene.
Abstract: We demonstrate the presence of Dirac cones in the dispersion relation of acoustic waves propagating on the surface of a plate of methyl methacrylate containing a honeycomb lattice of cylindrical boreholes. This structure represents the acoustic analogue of graphene, the cylindrical cavities playing the role of carbon atoms while acoustic surface waves are the equivalent of electronic waves in graphene. Analytical expressions for the Dirac frequency and Dirac velocity in acoustics are given as a function of the radius and depth of boreholes. These parameters have been experimentally determined for a constructed structure and the data are in fairly good agreement with the predicted values.

143 citations

Journal ArticleDOI
TL;DR: In this paper, the behavior of several fruits (three varieties of apples, strawberry, kiwi-fruit, mango and peach) during vacuum impregnation (VI) treatments was studied by using specially designed equipment and methodology to determine deformation and impregnnation levels in fruit samples.
Abstract: The behavior of several fruits (three varieties of apples, strawberry, kiwi-fruit, mango and peach) during vacuum impregnation (VI) treatments was studied by using specially designed equipment and methodology to determine deformation and impregnation levels in fruit samples. The coupling of the Hydrodynamic Mechanism (HDM) and the Deformation-Relaxation Phenomena (DRP) was analyzed throughout the two typical steps of VI process (first period at vacuum pressure and second period at atmospheric pressure). VI experiments were carried out over different lengths of time under vacuum (t1) and at atmospheric pressure (t2) duration in order to obtain kinetic information on the coupled HDM and DRP. Nevertheless, neither the duration of t1 or t2 was observed to have an influence on the deformation and impregnation levels in the examined time scales. The effective porosities (ɛe) of the fruits that were studied were determined and compared with the fruit porosity (ɛ) obtained from density data. In almost all cases the ratio ɛe/ɛ was lower than 1, which indicates that only a fraction of fruit pores was available to HDM action. DRP affects the volume fraction of impregnated liquid in all cases.

143 citations

Journal ArticleDOI
TL;DR: The design, fabrication, and experimental characterization of hyperbolic materials showing negative refraction and energy funneling of airborne sound are reported, allowing the gathering of acoustic energy in a broad range of incident angles and its funneling through the material.
Abstract: This Letter reports the design, fabrication, and experimental characterization of hyperbolic materials showing negative refraction and energy funneling of airborne sound. Negative refraction is demonstrated using a stack of five holey Plexiglas plates where their thicknesses, layer separation, hole diameters, and lattice periodicity have been determined to show hyperbolic dispersion around 40 kHz. The resulting hyperbolic material shows a flat band profile in the equifrequency contour allowing the gathering of acoustic energy in a broad range of incident angles and its funneling through the material. Our demonstrations foresee interesting developments based on both phenomena. Acoustic imaging with subwavelength resolution and spot-size converters that harvest and squeeze sound waves irradiating from many directions into a collimated beam are just two possible applications among many.

143 citations


Authors

Showing all 16503 results

NameH-indexPapersCitations
Avelino Corma134104989095
Bruce D. Hammock111140957401
Geoffrey A. Ozin10881147504
Wolfgang J. Parak10246943307
Hermenegildo García9779246585
María Vallet-Regí9571141641
Albert Ferrando8741936793
Rajendra Prasad8694529526
J.J. Garcia-Luna-Aceves8660225151
George W. Huber8428037964
Juan J. Calvete8145822646
Juan M. Feliu8054423147
Amparo Chiralt7829818378
Michael Tsapatsis7737520051
Josep Redon7748881395
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20241
2023130
2022331
20212,655
20202,861
20192,762