The physiology and metabolic properties of a novel, low‐abundance Psychrilyobacter species isolated from the anoxic Black Sea shed light on its ecological role

2021 ◽  
Author(s):  
Subhash Yadav ◽  
Michel Koenen ◽  
Nicole Bale ◽  
Jaap S. Sinninghe Damsté ◽  
Laura Villanueva
Keyword(s):  
Black Sea ◽  
Ecological Role ◽  
Metabolic Properties ◽  
Shed Light

scholarly journals The seventh pandemic of cholera in Europe revisited by microbial genomics

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Mihaela Oprea ◽  
Elisabeth Njamkepo ◽  
Daniela Cristea ◽  
Anna Zhukova ◽  
Clifford G. Clark ◽  
...  
Keyword(s):  
Black Sea ◽  
Eastern Africa ◽  
The Black Sea ◽  
Southern Europe ◽  
Whole Genome Analysis ◽  
Black Sea Region ◽  
El Tor ◽  
Insight Into ◽  
Shed Light

Abstract In 1970, the seventh pandemic of cholera (7 P) reached both Africa and Europe. Between 1970 and 2011, several European countries reported cholera outbreaks of a few to more than 2,000 cases. We report here a whole-genome analysis of 1,324 7 P V. cholerae El Tor (7 PET) isolates, including 172 from autochthonous sporadic or outbreak cholera cases occurring between 1970 and 2011 in Europe, providing insight into the spatial and temporal spread of this pathogen across Europe. In this work, we show that the 7 PET lineage was introduced at least eight times into two main regions: Eastern and Southern Europe. Greater recurrence of the disease was observed in Eastern Europe, where it persisted until 2011. It was introduced into this region from Southern Asia, often circulating regionally in the countries bordering the Black Sea, and in the Middle East before reaching Eastern Africa on several occasions. In Southern Europe, the disease was mostly seen in individual countries during the 1970s and was imported from North and West Africa, except in 1994, when cholera was imported into Albania and Italy from the Black Sea region. These results shed light on the geographic course of cholera during the seventh pandemic and highlight the role of humans in its global dissemination.

scholarly journals Embryogenesis, polyembryony, and settlement in the gorgonian Plexaura homomalla

2020 ◽  
Author(s):  
Christopher D. Wells ◽  
Kaitlyn J. Tonra ◽  
Howard R. Lasker
Keyword(s):  
Community Structure ◽  
Black Sea ◽  
Asexual Reproduction ◽  
Population Biology ◽  
Full Moon ◽  
Virgin Islands ◽  
The Black Sea ◽  
Fertilization Rates ◽  
Shed Light

ABSTRACTUnderstanding the ontogeny and reproductive biology of reef-building organisms can shed light on patterns of population biology and community structure. This knowledge is particularly important for Caribbean octocorals, which seem to be more resilient to long-term environmental change than scleractinian corals and provide some of the same ecological services. We monitored the development of the black sea rod Plexaura homomalla, a common, widely distributed octocoral on shallow Caribbean reefs, from eggs to 3-polyp colonies over the course of 73 days. In aquaria on St John, U.S. Virgin Islands, gametes were released in spawning events three to six days after the July full moon. Cleavage started 3 hours after fertilization and was holoblastic, equal, and radial. Embryos were positively buoyant until becoming planulae. Planulae were competent after 4 days. Symbiodiniaceae began infecting polyps at around 8 days post fertilization. Development was typical for Caribbean octocorals, except for the occurrence of a novel form of asexual reproduction in octocorals: polyembryony. Fragmentation of embryos during development may represent a temporally varied tradeoff between number and size of propagules, in which large eggs have higher fertilization rates followed by polyembryony, which maximizes the number of surviving recruits by generating more, albeit smaller, larvae. Polyembryony may contribute to the success of some gorgonians on Caribbean reefs as other anthozoans are in decline.

scholarly journals Two Rare Finds from the Maikop-Novosvobodnaya Sites in the Black Sea Region

2020 ◽  
Vol 48 (2) ◽  
pp. 29-37
Author(s):  
S. N. Korenevskiy ◽  
A. I. Yudin
Keyword(s):  
Black Sea ◽  
Late Stage ◽  
The Black Sea ◽  
Black Sea Region ◽  
Near Eastern ◽  
Tripolye Culture ◽  
Shed Light

We describe two unique fi nds from the 2018 excavations at the Maikop-Novosvobodnaya settlements of Pervomayskoye and Chekon in the Krasnodar Territory: a pendant and a clay figurine of a goddess, respectively. The parquet ornament on the pendant is paralleled by that on a cylindrical pendant-seal from Chekon. Such ornamentation is frequent on Near Eastern button-seals, and occurs on Anatolian artifacts symbolizing the fertility goddess and the magic related to her. Therefore, the Pervomayskoye and Chekon pendants, too, may be associated with the fertility cult. The figurine of a goddess from Chekon can be attributed to the Serezlievka type of the Late Tripolye culture. It testifies to ties between Maikop and Tripolye in the late 4th to early 3rd millennia BC. Both finds shed light on the vastly diverse beliefs of the Maikop-Novosvobodnaya tribes at the middle and late stage of that culture.

scholarly journals Sulphate-Reducing Microorganisms: the Study of Phylogenetic Community Composition, Metabolic Properties, a Role in Natural and Anthropogenic Ecosystems

2018 ◽  
pp. 42-45
Author(s):  
Andrey Brukhanov ◽  
Nicolay Pimenov ◽  
Tatyana Khizniak
Keyword(s):  
Water Column ◽  
Black Sea ◽  
Sulfate Reducing Bacteria ◽  
The Black Sea ◽  
Sulfate Reducing ◽  
Pure Cultures ◽  
Metabolic Properties ◽  
Global Biogeochemical Cycles ◽  
Biological Methods ◽  
Reducing Bacteria

Representatives of sulfate-reducing bacteria are among the oldest microorganisms on Earth and play a key role in the global biogeochemical cycles of carbon and sulfur, especially in marine ecosystems. Using the modern molecular biological methods based on the analysis of genes 16S rRNA and dsrAB the heterogeneous phylogenetic composition of different communities of sulfate-reducing bacteria in the water column and sediments of the Barents, Baltic and Black seas was studied. In particular, we have found representatives of the genera Desulfovibrio,Desulfomicrobium, Desulfotomaculum, Desulfococcus, Desulfosarcina, Desulfobacter. For the first time, pure cultures were obtained and the psychrophilic black sea sulfate-reducing bacteria from the water column and bottom sediments of the Black sea were fully characterized. In particular, we described as a new species of Desulfofrigus euxinos, which has a wider range of used donors and electron acceptors than a typical strain.

scholarly journals Natural products from microbes associated with insects

2016 ◽  
Vol 12 ◽  
pp. 314-327 ◽  
Author(s):  
Christine Beemelmanns ◽  
Huijuan Guo ◽  
Maja Rischer ◽  
Michael Poulsen
Keyword(s):  
Natural Products ◽  
Secondary Metabolites ◽  
Structural Features ◽  
Ecological Role ◽  
Host Interactions ◽  
Successful Strategy ◽  
Pharmaceutical Properties ◽  
Microbial Host ◽  
Shed Light

Here we review discoveries of secondary metabolites from microbes associated with insects. We mainly focus on natural products, where the ecological role has been at least partially elucidated, and/or the pharmaceutical properties evaluated, and on compounds with unique structural features. We demonstrate that the exploration of specific microbial–host interactions, in combination with multidisciplinary dereplication processes, has emerged as a successful strategy to identify novel chemical entities and to shed light on the ecology and evolution of defensive associations.

Turko-Tatar Roots of Modern Odessa: Hocabey and Karakermen

2021 ◽  
Vol 74 (4) ◽  
pp. 685-702
Keyword(s):  
Present Article ◽  
Black Sea ◽  
The Black Sea ◽  
Archival Documents ◽  
Northern Shore ◽  
The City ◽  
The Town ◽  
Shed Light

Located on the northern shore of the Black Sea, Odessa is one of Eastern Europe’s great cities. Much has been written about its history. Most of these studies were written from the Russian imperial perspective, and so the city’s Turko-Tatar period has been neglected. The present article attempts to shed light on this period of Odessa’s history, drawing mainly on Ottoman chronicles and archival documents. The predecessor and nucleus of the city was the Karakermen redoubt (palanka), which was built by Mengli Giray Khan I in 1495. Karakermen was destroyed as a result of recurrent Cossack raids in the mid-16th century. Although the Ottomans had intended to revitalise the city by rebuilding the redoubt during the last quarter of the 16th century, this project would be realized only in 1764 with the emergence of the town of Hocabey.

Elucidating cyclic AMP signaling in subcellular domains with optogenetic tools and fluorescent biosensors

2019 ◽  
Vol 47 (6) ◽  
pp. 1733-1747 ◽  
Author(s):  
Christina Klausen ◽  
Fabian Kaiser ◽  
Birthe Stüven ◽  
Jan N. Hansen ◽  
Dagmar Wachten
Keyword(s):  
Cyclic Amp ◽  
Adenosine Monophosphate ◽  
Adenylyl Cyclases ◽  
Temporal Precision ◽  
Fluorescent Biosensors ◽  
Subcellular Domains ◽  
Spatio Temporal ◽  
Hydrolysis Of ◽  
Shed Light ◽  
Cyclic Amp Signaling

The second messenger 3′,5′-cyclic nucleoside adenosine monophosphate (cAMP) plays a key role in signal transduction across prokaryotes and eukaryotes. Cyclic AMP signaling is compartmentalized into microdomains to fulfil specific functions. To define the function of cAMP within these microdomains, signaling needs to be analyzed with spatio-temporal precision. To this end, optogenetic approaches and genetically encoded fluorescent biosensors are particularly well suited. Synthesis and hydrolysis of cAMP can be directly manipulated by photoactivated adenylyl cyclases (PACs) and light-regulated phosphodiesterases (PDEs), respectively. In addition, many biosensors have been designed to spatially and temporarily resolve cAMP dynamics in the cell. This review provides an overview about optogenetic tools and biosensors to shed light on the subcellular organization of cAMP signaling.

Sentence-Based Experience Logging in New Hearing Aid Users

2020 ◽  
Vol 29 (3S) ◽  
pp. 631-637
Author(s):  
Katja Lund ◽  
Rodrigo Ordoñez ◽  
Jens Bo Nielsen ◽  
Dorte Hammershøi
Keyword(s):  
Hearing Aid ◽  
Patient Experiences ◽  
Online Tool ◽  
Rehabilitation Process ◽  
Hearing Rehabilitation ◽  
Clinical Observations ◽  
Hearing Aid Use ◽  
Wide Range ◽  
Insight Into ◽  
Shed Light

Purpose The aim of this study was to develop a tool to gain insight into the daily experiences of new hearing aid users and to shed light on aspects of aided performance that may not be unveiled through standard questionnaires. Method The tool is developed based on clinical observations, patient experiences, expert involvement, and existing validated hearing rehabilitation questionnaires. Results An online tool for collecting data related to hearing aid use was developed. The tool is based on 453 prefabricated sentences representing experiences within 13 categories related to hearing aid use. Conclusions The tool has the potential to reflect a wide range of individual experiences with hearing aid use, including auditory and nonauditory aspects. These experiences may hold important knowledge for both the patient and the professional in the hearing rehabilitation process.

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