complex display
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Author(s):  
Adrien Biessy ◽  
Marie Ciotola ◽  
Mélanie Cadieux ◽  
Daphné Albert ◽  
Martin Filion

Numerous bacterial strains from the Burkholderia cepacia complex display biocontrol activity. Here, we report the complete genome sequences of five Burkholderia strains isolated from soil. Biosynthetic gene clusters responsible for the production of antimicrobial compounds were found in the genome of these strains, which display biocontrol activity against various lettuce pathogens.


2020 ◽  
Author(s):  
Momchil Dyulgerov

<p>S</p><p>Several potassic-alkaline Variscan plutons (330 – 305 Ma) outcrop in Kraishte and Stara planina regions in Bulgaria: Lutskan, Svidnya, 7<sup>th</sup> Prestola Monastery, Buhovo-Seslavtsi, potassic syenites west of Shipka and Shipka (from west to east). These magmatic bodies have intermediate to acid compositions and evolve toward peralkaline syenites-granite residual varieties. They present a broad diversity in rock-forming mineralogy reflecting the variations of magma chemistry and conditions of crystallization. Evolution of mafic silicates in the plutons show unique features which enable to discriminate the trend of mineral evolution in each magmatic complex.</p><p>Pyroxenes from Svidnya pluton are presented in all facial types. Its compositions cover the entire spectrum from calcic to sodic varieties as pyroxenes evolve from diopside to aegirine. The clinopyroxenes from peralkaline syenite porphyries in Buhovo-Seslavtsi pluton belong to Ca-Na pyroxenes and their compositions vary from Wo<sub>25</sub>-En<sub>13</sub>-Fs<sub>13</sub>-Ac<sub>42</sub>- to Wo<sub>11</sub>-En<sub>6</sub>-Fs<sub>2</sub>-Ac<sub>65</sub>. Pyroxenes from potassic syenites west of Shipka display limited range and belong to pure diopside, whereas pyroxenes in the peralkaline dykes from Shipka pluton are aegirine-augites. Also, aegirine-augite and aegirine from Svidnya and Buhovo-Seslavtsi are enriched in Ti (TiO<sub>2</sub> up to 6.5 wt. %), while aegirine-augite from Shipka shows high Zr content (ZrO<sub>2</sub> up to 2.9 wt. %), as Ti and Zr enter pyroxene structure via Na(Mg,Fe<sup>2+</sup>)<sub>0.5</sub>(Ti, Zr)<sub>0.5</sub>Si<sub>2</sub>O<sub>6</sub> molecule.</p><p>Amphiboles from Lutskan and 7<sup>th</sup> Prestola Monastery are low temperature, reflecting their near-solidus stage of crystallization or postmagmatic reequilibration due to the circulation of deuteric fluids. Their composition is winchite - riebeckite, and winchite – barroisite, respectively. In turn, amphiboles from Svidnya complex display a narrow compositional variation from richterites to magnesio-arfvedsonite, and rarely eckermanite. Amphiboles in Buhovo-Seslavtzi complex show broad diversity in their composition as they belong to sodic-calcic and sodic groups. They evolve from ferrobaroisite, ferrowinchite to richterite and potassic-magnesio-arfvedsonite with [A]-site filled by K. Amphiboles from the potassic syenites outcropping west of Shipka are arfvedsonite, characterised with elevated Ti content (up to 4.4 wt. % TiO<sub>2</sub>).</p><p>Micas from all complexes show limited evolution. In Svidnya, Buhovo-Seslavtsi, Shipka and 7<sup>th</sup> Prestola Monastery only biotite is present. Characteristic feature of biotites from Shipka is the elevated fluorine content (up to 5 wt. % F) which coupled with presence of fluorite implies on the F-domination in the fluid phase during the crystallization of the rocks. In Lutskan and in the syenites west of Shipka micas show broad range of variation from phlogopite to biotite.</p><p> </p><p>Acknowledgements: The financial support provided by the NSF (Ministry of Education and Science of Bulgaria) through DH 14/8 project is acknowledged.</p>


2019 ◽  
Vol 201 (11) ◽  
Author(s):  
Brea Kern ◽  
Owen P. Leiser ◽  
Rajeev Misra

ABSTRACTInEscherichia coli, the periplasmic protease DegP plays a critical role in degrading misfolded outer membrane proteins (OMPs). Consequently, mutants lacking DegP display a temperature-sensitive growth defect, presumably due to the toxic accumulation of misfolded OMPs. The Tol-Pal complex plays a poorly defined but an important role in envelope biogenesis, since mutants defective in this complex display a classical periplasmic leakage phenotype. Double mutants lacking DegP and an intact Tol-Pal complex display exaggerated temperature-sensitive growth defects and the leaky phenotype. Two revertants that overcome the temperature-sensitive growth phenotype carry missense mutations in thedegSgene, resulting in D102V and D320A substitutions. D320 and E317 of the PDZ domain of DegS make salt bridges with R178 of DegS’s protease domain to keep the protease in the inactive state. However, weakening of the tripartite interactions by D320A increases DegS’s basal protease activity. Although the D102V substitution is as effective as D320A in suppressing the temperature-sensitive growth phenotype, the molecular mechanism behind its effect on DegS’s protease activity is unclear. Our data suggest that the two DegS variants modestly activate RseA-controlled, σE-mediated envelope stress response pathway and elevate periplasmic protease activity to restore envelope homeostasis. Based on the release of a cytoplasmic enzyme in the culture supernatant, we conclude that the conditional lethal phenotype of ΔtolBΔdegPmutants stems from a grossly destabilized envelope structure that causes excessive cell lysis. Together, the data point to a critical role for periplasmic proteases when the Tol-Pal complex-mediated envelope structure and/or functions are compromised.IMPORTANCEThe Tol-Pal complex plays a poorly defined role in envelope biogenesis. The data presented here show that DegP’s periplasmic protease activity becomes crucial in mutants lacking the intact Tol-Pal complex, but this requirement can be circumvented by suppressor mutations that activate the basal protease activity of a regulatory protease, DegS. These observations point to a critical role for periplasmic proteases when Tol-Pal-mediated envelope structure and/or functions are perturbed.


2019 ◽  
Vol 15 (1) ◽  
pp. 20180647 ◽  
Author(s):  
Susan A. Foster ◽  
Shannon O'Neil ◽  
Richard W. King ◽  
John A. Baker

Adaptive radiations often exhibit high levels of phenotypic replication, a phenomenon that can be explained by selection on standing variation in repeatedly divergent environments or by the influence of ancestral plasticity on selection in divergent environments. Here, we offer the first evidence that plastic loss of expression of a complex display in a novel environment, followed by selection against expression, could lead to replicated evolutionary inhibition of the phenotype. In both ancestral (oceanic) and benthic (freshwater) populations of the threespine stickleback fish, cannibalism is common and males defending nests respond to approaching groups with a complex diversionary display. This display is not exhibited by males in allopatric, limnetic (freshwater) populations from which cannibalistic groups are absent. Laboratory-reared males from three limnetic populations exhibit a reduced tendency to respond to cannibalistic foraging groups relative to laboratory-reared ancestral and benthic males, but still are capable of producing a similar array of forms of the display despite many generations of disuse. Thus, replication in adaptive radiations can reflect reduced expression of an ancestral trait followed by evolutionary inhibition while the population retains the capacity to express the trait under extreme ancestral conditions.


2018 ◽  
Author(s):  
Vanesa Jiménez-Amilburu ◽  
Didier Y.R. Stainier

AbstractTissue morphogenesis requires changes in cell-cell adhesion as well as in cell shape and polarity. Cardiac trabeculation is a morphogenetic process essential to form a functional ventricular wall. Here we show that zebrafish hearts lacking Crb2a, a component of the Crumbs polarity complex, display compact wall integrity defects and fail to form trabeculae. Crb2a localization is very dynamic, at a time when other cardiomyocyte junctional proteins also relocalize. Before the initiation of cardiomyocyte delamination to form the trabecular layer, Crb2a is expressed in all ventricular cardiomyocytes colocalizing with the junctional protein ZO-1. Subsequently, Crb2a becomes localized all along the apical membrane of compact layer cardiomyocytes and is downregulated by those delaminating. We show that blood flow and Nrg/ErbB2 signaling regulate these Crb2a localization changes. crb2a mutants display a multilayered wall with polarized cardiomyocytes, a unique phenotype. Our data further indicate that Crb2a regulates cardiac trabeculation by controlling the localization of tight and adherens junctions in cardiomyocytes. Importantly, transplantation data show that Crb2a controls trabeculation in a CM-autonomous manner. Altogether, our study reveals a critical role for Crb2a during cardiac development.Summary statementInvestigation of the Crumbs polarity protein Crb2a in zebrafish reveals a novel role in cardiac development via regulation of cell-cell adhesion and apicobasal polarity.


2017 ◽  
Vol 256 ◽  
pp. S38
Author(s):  
Francesco Ragonese ◽  
Loretta Mancinelli ◽  
Gabriele Brecchia ◽  
Caludia Tubaro ◽  
Roberto Spogli ◽  
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2017 ◽  
Vol 53 (87) ◽  
pp. 11925-11928 ◽  
Author(s):  
Jian-Hong Tang ◽  
Tian-Ge Sun ◽  
Jiang-Yang Shao ◽  
Zhong-Liang Gong ◽  
Yu-Wu Zhong

The sandwiched devices of a cobalt(ii) bis-terpyridine complex display appealing flash-type resistive switching (ON/OFF >103; voltage <±3 V).


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