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https://www.readbyqxmd.com/read/28738545/municipal-wastewater-treatment-via-co-immobilized-microalgal-bacterial-symbiosis-microorganism-growth-and-nutrients-removal
#1
Yu Shen, Jingqing Gao, Linshuai Li
A symbiotic microalgal-bacterial system may be an optional technology for wastewater treatment. In this study, co-immobilized of a bacterium isolated from a municipal wastewater treatment plant (Pseudomonas putida) and a microalgae Chlorella vulgaris was used in the study of cell growth and nutrient removal during wastewater treatment under batch and continuous culture conditions. Under batch culture conditions, co-immobilization treatment significantly increased the cell density of C. vulgaris and P. putida compared with other treatments...
July 8, 2017: Bioresource Technology
https://www.readbyqxmd.com/read/28734735/metabolic-interactions-in-the-tumor-microenvironment
#2
REVIEW
Costas A Lyssiotis, Alec C Kimmelman
Tumors are dynamic pseudoorgans that contain numerous cell types interacting to create a unique physiology. Within this network, the malignant cells encounter many challenges and rewire their metabolic properties accordingly. Such changes can be experienced and executed autonomously or through interaction with other cells in the tumor. The focus of this review is on the remodeling of the tumor microenvironment that leads to pathophysiologic interactions that are influenced and shaped by metabolism. They include symbiotic nutrient sharing, nutrient competition, and the role of metabolites as signaling molecules...
July 19, 2017: Trends in Cell Biology
https://www.readbyqxmd.com/read/28733389/cytokinin-biosynthesis-promotes-cortical-cell-responses-during-nodule-development
#3
Dugald Elgin Reid, Marcin Nadzieja, Ondrej Novak, Anne Birgitte Heckmann, Niels Sandal, Jens Stougaard
Legume mutants have shown the requirement for receptor-mediated cytokinin signalling in symbiotic nodule organogenesis. While the receptors are central regulators, cytokinin is also accumulated during early phases of symbiotic interaction but the pathways involved have not yet been fully resolved. To identify the source, timing and effect of this accumulation, we followed transcript levels of the cytokinin biosynthetic pathway genes in a sliding developmental zone of Lotus japonicus roots. LjIpt2 and LjLog4 were identified as the major contributors to the first cytokinin burst...
July 21, 2017: Plant Physiology
https://www.readbyqxmd.com/read/28732146/medicago-truncatula-zinc-iron-permease6-provides-zinc-to-rhizobia-infected-nodule-cells
#4
Isidro Abreu, Ángela Saéz, Rosario Castro-Rodríguez, Viviana Escudero, Benjamín Rodríguez-Haas, Marta Senovilla, Camille Larue, Daniel Grolimund, Manuel Tejada-Jiménez, Juan Imperial, Manuel González-Guerrero
Zinc is a micronutrient required for symbiotic nitrogen fixation. It has been proposed that in model legume Medicago truncatula, zinc is delivered by the root vasculature into the nodule and released in the infection/differentiation zone. There, transporters must introduce this element into rhizobia-infected cells to metallate the apoproteins that use zinc as a cofactor. MtZIP6 (Medtr4g083570) is a M. truncatula Zinc-Iron Permease (ZIP) that is expressed only in roots and nodules, with the highest expression levels in the infection/differentiation zone...
July 21, 2017: Plant, Cell & Environment
https://www.readbyqxmd.com/read/28731202/on-the-brink-the-highly-reduced-plastomes-of-nonphotosynthetic-ericaceae
#5
Thomas W A Braukmann, Michael B Broe, Saša Stefanović, John V Freudenstein
Ericaceae (the heather family) is a large and diverse group of plants that forms elaborate symbiotic relationships with mycorrhizal fungi, and includes several nonphotosynthetic lineages. Using an extensive sample of fully mycoheterotrophic (MH) species, we explored inter- and intraspecific variation as well as selective constraints acting on the plastomes of these unusual plants. The plastomes of seven MH genera were analysed in a phylogenetic context with two geographically disparate individuals sequenced for Allotropa, Monotropa, and Pityopus...
July 21, 2017: New Phytologist
https://www.readbyqxmd.com/read/28729859/transcriptomic-insight-in-the-control-of-legume-root-secondary-infection-by-the-sinorhizobium-meliloti-transcriptional-regulator-clr
#6
Lan Zou, Amandine Gastebois, Céline Mathieu-Demazière, Fernando Sorroche, Catherine Masson-Boivin, Jacques Batut, Anne-Marie Garnerone
The cAMP-dependent transcriptional regulator Clr of Sinorhizobium meliloti regulates the overall number of infection events on Medicago roots by a so-far unknown mechanism requiring smc02178, a Clr-target gene of unknown function. In order to shed light on the mode of action of Clr on infection and potentially reveal additional biological functions for Clr, we inventoried genomic Clr target genes by transcriptome profiling. We have found that Clr positively controls the synthesis of cAMP-dependent succinoglycan as well as the expression of genes involved in the synthesis of a so-far unknown polysaccharide compound...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28728564/comparison-of-the-protein-coding-genomes-of-three-deep-sea-sulfur-oxidising-bacteria-candidatus-ruthia-magnifica-candidatus-vesicomyosocius-okutanii-and-thiomicrospira-crunogena
#7
Susan E McGill, Daniel Barker
OBJECTIVE: " Candidatus Ruthia magnifica", "Candidatus Vesicomyosocius okutanii" and Thiomicrospira crunogena are all sulfur-oxidising bacteria found in deep-sea vent environments. Recent research suggests that the two symbiotic organisms, "Candidatus R. magnifica" and "Candidatus V. okutanii", may share common ancestry with the autonomously living species T. crunogena. We used comparative genomics to examine the genome-wide protein-coding content of all three species to explore their similarities...
July 20, 2017: BMC Research Notes
https://www.readbyqxmd.com/read/28725961/the-plasma-membrane-proteome-of-medicago-truncatula-roots-as-modified-by-arbuscular-mycorrhizal-symbiosis
#8
Achref Aloui, Ghislaine Recorbet, Christelle Lemaître-Guillier, Arnaud Mounier, Thierry Balliau, Michel Zivy, Daniel Wipf, Eliane Dumas-Gaudot
In arbuscular mycorrhizal (AM) roots, the plasma membrane (PM) of the host plant is involved in all developmental stages of the symbiotic interaction, from initial recognition to intracellular accommodation of intra-radical hyphae and arbuscules. Although the role of the PM as the agent for cellular morphogenesis and nutrient exchange is especially accentuated in endosymbiosis, very little is known regarding the PM protein composition of mycorrhizal roots. To obtain a global overview at the proteome level of the host PM proteins as modified by symbiosis, we performed a comparative protein profiling of PM fractions from Medicago truncatula roots either inoculated or not with the AM fungus Rhizophagus irregularis...
July 19, 2017: Mycorrhiza
https://www.readbyqxmd.com/read/28724736/phenotypic-shift-in-wolbachia-virulence-towards-its-native-host-across-serial-horizontal-passages
#9
Winka Le Clec'h, Jessica Dittmer, Maryline Raimond, Didier Bouchon, Mathieu Sicard
Vertical transmission mode is predicted to decrease the virulence of symbionts. However, Wolbachia, a widespread vertically transmitted endosymbiont, exhibits both negative and beneficial effects on arthropod fitness. This 'Jekyll and Hyde' behaviour, as well as its ability to live transiently outside host cells and to establish new infections via horizontal transmission, may reflect the capacity of Wolbachia to exhibit various phenotypes depending on the prevailing environmental constraints. To study the ability of Wolbachia to readily cope with new constraints, we forced this endosymbiont to spread only via horizontal transmission...
July 26, 2017: Proceedings. Biological Sciences
https://www.readbyqxmd.com/read/28723242/interspecific-and-intraspecific-hybrid-epichlo%C3%A3-species-symbiotic-with-the-north-american-native-grass-poa-alsodes
#10
Tatsiana Shymanovich, Nikki D Charlton, Ashleigh M Musso, Jonathan Scheerer, Nadja B Cech, Stanley H Faeth, Carolyn A Young
The endophyte presence and diversity in natural populations of Poa alsodes were evaluated along a latitudinal transect from the southern distribution range in North Carolina to New York. Two distinct Epichloë hybrid taxa were identified from 23 populations. Each taxon could easily be distinguished by polymerase chain reaction (PCR) genotyping with primers designed to mating type genes and alkaloid biosynthesis genes that encode key pathway steps for ergot alkaloids, indole-diterpenes, lolines, and peramine...
June 26, 2017: Mycologia
https://www.readbyqxmd.com/read/28722181/historical-biome-distribution-and-recent-human-disturbance-shape-the-diversity-of-arbuscular-mycorrhizal-fungi
#11
Meelis Pärtel, Maarja Öpik, Mari Moora, Leho Tedersoo, Robert Szava-Kovats, Søren Rosendahl, Matthias C Rillig, Ylva Lekberg, Holger Kreft, Thorunn Helgason, Ove Eriksson, John Davison, Francesco de Bello, Tancredi Caruso, Martin Zobel
The availability of global microbial diversity data, collected using standardized metabarcoding techniques, makes microorganisms promising models for investigating the role of regional and local factors in driving biodiversity. Here we modelled the global diversity of symbiotic arbuscular mycorrhizal (AM) fungi using currently available data on AM fungal molecular diversity (small subunit (SSU) ribosomal RNA (rRNA) gene sequences) in field samples. To differentiate between regional and local effects, we estimated species pools (sets of potentially suitable taxa) for each site, which are expected to reflect regional processes...
July 19, 2017: New Phytologist
https://www.readbyqxmd.com/read/28721658/microbial-communities-in-different-tissues-of-atta-sexdens-rubropilosa-leaf-cutting-ants
#12
Alexsandro S Vieira, Manuela O Ramalho, Cintia Martins, Vanderlei G Martins, Odair C Bueno
Bacterial endosymbionts are common in all insects, and symbiosis has played an integral role in ant evolution. Atta sexdens rubropilosa leaf-cutting ants cultivate their symbiotic fungus using fresh leaves. They need to defend themselves and their brood against diseases, but they also need to defend their obligate fungus gardens, their primary food source, from infection, parasitism, and usurpation by competitors. This study aimed to characterize the microbial communities in whole workers and different tissues of A...
July 18, 2017: Current Microbiology
https://www.readbyqxmd.com/read/28721507/the-diversity-and-antibiotic-properties-of-actinobacteria-associated-with-endemic-deepwater-amphipods-of-lake-baikal
#13
Eugenii S Protasov, Denis V Axenov-Gribanov, Yuriy V Rebets, Irina V Voytsekhovskaya, Bogdan T Tokovenko, Zhanna M Shatilina, Andriy N Luzhetskyy, Maxim A Timofeyev
The emergence of pathogenic bacteria resistant to antibiotics increases the need for discovery of new effective antimicrobials. Unique habitats such as marine deposits, wetlands and caves or unexplored biological communities are promising sources for the isolation of actinobacteria, which are among the major antibiotic producers. The present study aimed at examining cultivated actinobacteria strains associated with endemic Lake Baikal deepwater amphipods and estimating their antibiotic activity. We isolated 42 actinobacterial strains from crustaceans belonging to Ommatogammarus albinus and Ommatogammarus flavus...
July 18, 2017: Antonie Van Leeuwenhoek
https://www.readbyqxmd.com/read/28717220/imaging-mass-spectrometry-and-ms-ms-molecular-networking-reveals-chemical-interactions-among-cuticular-bacteria-and-pathogenic-fungi-associated-with-fungus-growing-ants
#14
Cristopher A Boya P, Hermógenes Fernández-Marín, Luis C Mejía, Carmenza Spadafora, Pieter C Dorrestein, Marcelino Gutiérrez
The fungus-growing ant-microbe symbiosis is an ideal system to study chemistry-based microbial interactions due to the wealth of microbial interactions described, and the lack of information on the molecules involved therein. In this study, we employed a combination of MALDI imaging mass spectrometry (MALDI-IMS) and MS/MS molecular networking to study chemistry-based microbial interactions in this system. MALDI IMS was used to visualize the distribution of antimicrobials at the inhibition zone between bacteria associated to the ant Acromyrmex echinatior and the fungal pathogen Escovopsis sp...
July 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28716396/the-role-of-pilin-protein-of-xenorhabdus-nematophila-against-immune-defense-reactions-of-insects
#15
Reyhaneh Darsouei, Javad Karimi, Gary B Dunphy
Xenorhabdus nematophila is a symbiotic bacterium of the entomopathogenic nematode Steinernema carpocapsae (Weiser). It produces several toxic proteins which interfere with the immune system of insects. The current study shows that purified pilin protein could be a virulence trait of X. nematophila. The fifth instar larvae of Spodoptera exigua (Hübner) was injected with purified pilin. Changes in the cellular defenses in terms of total haemocyte counts and granulocyte percentage and humoral factors including total protease, phospholipase A2, and phenoloxidase activities (humoral defense) as well as the expression of the three main antimicrobial peptides attacin, cecropin, and spodoptericin were measured at specific times...
July 14, 2017: Journal of Insect Physiology
https://www.readbyqxmd.com/read/28712497/use-of-crispr-cas9-for-symbiotic-nitrogen-fixation-research-in-legumes
#16
Longlong Wang, Longxiang Wang, Yu Zhou, Deqiang Duanmu
Nitrogen-fixing rhizobia have established a symbiotic relationship with the legume family through more than 60 million years of evolution. Hundreds of legume host genes are involved in the SNF (symbiotic nitrogen fixation) process, such as recognition of the bacterial partners, nodulation signaling and nodule development, maintenance of highly efficient nitrogen fixation within nodules, regulation of nodule numbers, and nodule senescence. However, investigations of SNF-related gene functions and dissecting molecular mechanisms of the complicated signaling crosstalk on a genomic scale were significantly restricted by insufficient mutant resources of several representative model legumes...
2017: Progress in Molecular Biology and Translational Science
https://www.readbyqxmd.com/read/28711576/explaining-coexistence-of-nitrogen-fixing-and-non-fixing-rhizobia-in-legume-rhizobia-mutualism-using-mathematical-modeling
#17
G Moyano, D Marco, D Knopoff, G Torres, C Turner
In the mutualism established between legumes and soil bacteria known as rhizobia, bacteria from soil infect plants roots and reproduce inside root nodules where they fix atmospheric N2 for plant nutrition, receiving carbohydrates in exchange. Host-plant sanctions against non N2 fixing, cheating bacterial symbionts have been proposed to act in the legume-Rhizobium symbiosis, to preserve the mutualistic relationship. Sanctions include decreased rhizobial survival in nodules occupied by cheating rhizobia. Previously, a simple population model experimentally based showed that the coexistence of fixing and cheating rhizobia strains commonly found in field conditions is possible, and that the inclusion of sanctions leads to the extinction of cheating strains in soil...
July 12, 2017: Mathematical Biosciences
https://www.readbyqxmd.com/read/28710419/generation-of-clade-and-symbiont-specific-antibodies-to-characterize-marker-molecules-during-cnidaria-symbiodinium-endosymbiosis
#18
Kao-Jean Huang, Zi-Yu Huang, Ching-Yen Lin, Li-Hsueh Wang, Pin-Hsiang Chou, Chii-Shiarng Chen, Hsing-Hui Li
The endosymbiosis between cnidarians and dinoflagellates is responsible for the formation of coral reefs. Changes in molecules have been identified during the process of cnidaria-Symbiodinium endosymbiosis. However, the complexity of the molecular interaction has prevented the establishment of a mechanistic explanation of cellular regulation in this mutualistic symbiosis. To date, no marker molecules have been identified to specifically represent the symbiotic status. Because the endosymbiotic association occurs in the symbiotic gastrodermal cells (SGCs), whole cells of isolated SGCs were used as an antigen to generate monoclonal antibodies (mAb) to screen possible molecular candidates of symbiotic markers...
July 14, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28710265/francisella-like-endosymbionts-and-rickettsia-species-in-local-and-imported-hyalomma-ticks
#19
Tal Azagi, Eyal Klement, Gidon Perlman, Yaniv Lustig, Kosta Y Mumcuoglu, Dmitry Apanaskevich, Yuval Gottlieb
Hyalomma ticks (Acari: Ixodidae) are hosts for Francisella like endosymbionts (FLE) and may serve as vectors of zoonotic disease agents. This study was aimed to provide initial characterization of the interaction between Hyalomma and FLE and to determine the prevalence of pathogenic Rickettsia in these ticks. Hyalomma marginatum, H. rufipes, H. dromedarii, H. aegyptium and H. excavatum ticks, identified morphologically and molecularly, were collected from different hosts and locations, representing the genus distribution in Israel, as well as from migratory birds...
July 14, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28709805/effect-of-diseases-on-symbiotic-systems
#20
Pankaj Kumar Tiwari, Sourav Kumar Sasmal, Amar Sha, Ezio Venturino, Joydev Chattopadhyay
There are many species living in symbiotic communities. In this study, we analyzed models in which populations are in the mutualism symbiotic relations subject to a disease spreading among one of the species. The main goal is the characterization of symbiotic relations of coexisting species through their mutual influences on their respective carrying capacities, taking into account that this influence can be quite strong. The functional dependence of the carrying capacities reflects the fact that the correlations between populations cannot be realized merely through direct interactions, as in the usual predator-prey Lotka-Volterra model, but also through the influence of each species on the carrying capacities of the other one...
July 12, 2017: Bio Systems
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