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2022 ◽  
Author(s):  
Agathe Defourny ◽  
Pierre-Henri Blard ◽  
Laurent Zimmermann ◽  
Patrick Jobé ◽  
Arnaud Collignon ◽  
...  

Abstract. Natural CO2-rich groundwaters of eastern Belgium have been known for centuries although the exact origin of the gas they contained was still unclear. This paper presents the results of a sampling campaign in the area (Spa, Stoumont, Malmedy) where 30 samples of both carbogazeous and non-carbogazeous groundwaters have been analyzed for major elements, CO2 content and carbon isotopic composition. Among them, 13 samples were analyzed for 3He / 4He and 4He / 20Ne ratios. The combination of δ13C and 3He / CO2 ratios have shown with a high level of confidence that the CO2 in groundwater from springs and boreholes has a mantellic origin, and can very likely be attributed to the degassing of the neighboring and still buoyant Eifel mantle plume, located at a distance of 100 km eastwards. The identity and nature of the deep-rooted fractures that act as CO2 transport pathway to the surface are still to be clarified, but several major thrust faults exist in the Rhenish Massif and could connect the Eifel volcanic field with the studied area.


2021 ◽  
Vol 8 ◽  
Author(s):  
Asma Azzouzi ◽  
Karima El Harti

Lichen planus (LP) is a chronic, relapsing, non-infectious inflammatory disease affecting the skin and mucous membranes. The exact origin of oral lichen planus (OLP) is not well known. Complete spontaneous healing is rare. The treatment of oral lichen planus is palliative, and there is no curative treatment so far, which is a therapeutic challenge for practitioners. The goals of treatment are the control of pain, signs, and symptoms. Local corticosteroids remain the first-line treatment. In case of failure of drug therapy, other treatments can be considered, such as photodynamic therapy. Material and methods: Our work was carried out using the PubMed, ScienceDirect, and EBSCO search engines to explore the literature on the efficacy of photodynamic therapy in the treatment of lichen planus. Conclusion: Photodynamic therapy appears to have some effect in the treatment of OLP in adult patients. However, further randomized controlled trials with a long follow-up period, standardized PDT parameters, and comparison of PDT efficacy with steroid therapy are warranted to obtain firm conclusions in this regard.


Author(s):  
Deepa Revi

The exact origin of the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) responsible for unleashing the pandemic Corona Virus Disease (Covid-19) is still not established unambiguously. The intermediate and reservoir hosts of SARS-CoV-2 need to be identified with clarity and how the disease exploded into a pandemic, inevitability needs urgent scientific answers to contain and prevent future pandemics and crises. This perspective provides awareness of the peculiar features of SARS-CoV-2 and inspects the gaps in the natural zoonotic origin of the pandemic.


Author(s):  
Deepa Revi

The exact origin of the Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) responsible for unleashing the pandemic Corona Virus Disease (Covid-19) is still not established unambiguously. The intermediate and reservoir hosts of SARS-CoV-2 need to be identified with clarity and how the disease exploded into a pandemic, inevitability needs urgent scientific answers to contain and prevent future pandemics and crises. This perspective provides awareness of the peculiar features of SARS-CoV-2 and inspects the gaps in the natural zoonotic origin of the pandemic.


Author(s):  
Yu Feng ◽  
Ya Hu ◽  
Zhiyong Zong

We performed whole genome sequencing for 17 Enterobacter clinical strains and analyzed all available Enterobacter genomes and its closely-related genera (n=3,389) from NCBI. The exact origin of plasmid-borne bla CMH and bla MIR genes is Enterobacter cloacae and Enterobacter roggenkampii , respectively, while plasmid-borne bla ACT genes originated from multiple other Enterobacter species including Enterobacter xiangfangensis , Enterobacter hoffmannii , and Enterobacter asburiae , Enterobacter ludwigii , and Enterobacter kobei . The genus of Enterobacter represents a large reservoir of plasmid-borne AmpC β-lactamase.


2021 ◽  
Vol 2021 (3) ◽  
pp. 25-31
Author(s):  
Evgeniy Kemel'man ◽  
Elena Kostygova ◽  
Ivan Tyurenkov ◽  
Maksim Lapshin

Defects of the ventral arch of the atlas were detected on computed tomography in nine cats aged 3…12 months with signs of upper cervical injury including paina and ataxia. Seven cats have an ambulatory tetraparesis, and two cats have a nonambulatory tetraparesis. The bone defects were consistent with the normal location of the ventral arch growth areas of the atlas. In all observed cats, the pattern of ossification abnormalities was similar — the lateral portion of the arch was completely absent in seven cats on the left and in two cats on the right. The structure of the ventral tubercle was traceable in 8 of 9 cats. Also, in 8 of 9 cases an isolated bone fragment was observed lateral to the dens of the axis, the exact origin of which was not determined. This fragment was observed in 6 cases on the right, in two cases on the left, and only in two cases it corresponded to the side of the undeveloped arch. In 7 out of 9 cats, the dorsal arch was not fused; in 2 cats with complete fusion, the dorsal arch was deformed. An dens fracture was visualized in 3 cases, no hypoplasia of the dens was visualized, and one cat have atlantoaxial subluxation. Seven cats received conservative treatment and 2 cats received surgical treatment. Clinical improvement was observed in all cats. Disorder the ossification of the ventral arch of the atlas should be considered as the differential diagnosis in young cats with suspected atlanto-axial instability and trauma of the cervical spine. The authors were unable to find publications describing this atlas developmental abnormality in cats, so the authors believe that this is the first mention of incomplete ossification of the atlas in cats.


2021 ◽  
Vol 3 ◽  
Author(s):  
Adeline N. Y. Cojean ◽  
Katrina Kremer ◽  
Maciej Bartosiewicz ◽  
Stefano C. Fabbri ◽  
Moritz F. Lehmann ◽  
...  

Pockmarks are crater-like depressions formed by upward fluid flow (gas and/or liquid) through the unconsolidated sediment column on the floor of oceans and lakes. While pockmarks are well described in the marine realm, they have essentially been overlooked in lacustrine settings, likely due to a lack in economic interest to apply high-resolution hydroacoustic techniques in lakes. A swath-bathymetry survey on Lake Thun, Switzerland, revealed the existence of three pockmark systems. One pockmark (110 m in diameter) was discovered near a big karst system at Beatenberg at a water depth of ~217 m. Its activity is probably associated with episodic groundwater seepage induced by earthquakes, floods and snowmelt. At another site, Daerligen, we detected at ~60 m water depth the presence of multiple smaller pockmarks (~1.5 to 10 m in diameter) that seem to be active, continuously liberating CH4 gas by bubble ebullition. The CH4 displayed a biogenic carbon isotopic signature, however, the exact origin of the gas remains unknown. The third site, Tannmoos (~35 m water depth), comprises two large pockmarks (20–43 m in diameter) connected to a karst system in gypsum-carrying bedrock. One of these pockmarks is constituted of several unit pockmarks (e.g., sub-pockmarks; 0.3 to 0.8 m in diameter). While strong evidence is still lacking, we suggest that groundwater discharge occasionally occurs through these unit pockmarks during periods of intense precipitation. Hence, this study reveals the existence of three pockmark systems of variable morphology and mechanisms of formation within the same lake, reflecting different hydrological and biogeochemical regimes. Moreover, it underscores the potential importance of pockmarks in influencing hydrological and CH4 budgets in lakes. Clearly more work on quantifying seasonal fluxes of groundwater and CH4 release via lacustrine pockmarks is required, and it needs to be seen whether the observations made in Lake Thun are universal and apply also to many other lacustrine environments worldwide.


Author(s):  
Ariful Islam ◽  
Jinnat Ferdous ◽  
Shariful Islam ◽  
Md. Abu Sayeed ◽  
Md Rahman ◽  
...  

The exact origin of Severe Acute Respiratory Syndrome Coronavirus 2 (SARS-CoV-2) and source of introduction into humans has not been established yet, though it might be originated from animals. Therefore, we conducted a literature review to understand the putative reservoirs, transmission dynamics, and susceptibility patterns of SARS-CoV-2 in animals. Rhinolophu s bats are presumed to be natural progenitors of SARS-CoV-2 related viruses. Initially pangolin was thought to be the source of spillover to human, but they might get infected from human or other animal species. So, the virus spillover pathways to humans remain unknown. Human-to-animal transmission has been testified in pet, farmed, zoo and free-ranging wild animals. Infected animals can transmit the virus to other animals in natural settings like, mink-to-mink, and mink-to-cat transmission. Animal-to-human transmission is not a persistent pathway, while mink-to-human transmission continues to be illuminated. Multiple companion and captive wild animals were infected by emerging alpha variant of concern (B.1.1.7 lineage) whereas Asiatic lions were infected by delta variant, (B.1.617.2). To date, multiple animal species- cat, ferrets, non-human primates, hamsters, and bats, showed high susceptibility to SARS-CoV-2 in experimental condition, while swine, poultry, cattle showed no susceptibility. The founding of SARS-CoV-2 in wild animal reservoirs can confronts the control of the virus in humans and might carry a risk to the welfare and conservation of wildlife as well. We suggest vaccinating pet, and captive animals to stop spillover and spillback events. We recommend sustainable one health surveillance at animal-human-environmental interface to detect and prevent future epidemics and pandemics by Disease X.


2021 ◽  
Vol VOLUME 9 (ISSUE 1) ◽  
pp. 32-34
Author(s):  
Foma Winga

Introduction: Schwannomas are tumors developed from Schwann cells present in the peripheral nerve sheaths. Their development both extra and intracranial is extremely rare. Observation: We report the case of a 36-year-old man who consulted for sinonasal syndrome evolving over the past ten years in which explorations found a large benign schwannoma of the anterior base of the skull with sinonasal and pharyngeal extension. The excision was performed externally by Moure and Sébileau with ENT and neurosurgery collaboration. The suites were simple. Discussion: The present observation again raises the question of the exact origin of developing sinonasal and endocranial schwannomas. The origin of the lesion and our management conditions were discussed. Conclusion: as for other authors, schwannoma should be considered in the diagnosis of skull base tumors. External surgery for extensive forms and ENT and neurosurgery collaboration help to minimize the risk of complications. Keywords: schwannoma; sinonasal schwannoma; skull base tumor.


2021 ◽  
Author(s):  
Satadal Dutta ◽  
Elias Kaiser ◽  
Priscila Malcolm Matamoros ◽  
Peter Steeneken ◽  
Gerard Verbiest

Abstract Although it is well known that plants emit ultrasound bursts under drought stress, the exact origin of the acoustic waveform of these pulses has remained elusive. Here we present evidence for a correlation between the ultrasound spectrum of these pulses and the dimensions of the plant’s xylem vessels. Using a model that relates the vibrational excitations of the vessels to their geometric and viscoelastic properties, we develop a methodology to extract the internal xylem vessel dimensions from recorded ultrasound waveforms. We apply the method to ultrasound pulses from drying shoots of three vascular dicot plant species, and validate it by comparison with destructive measurements via microscopy. Our method demonstrates the potential for continuous monitoring of the vascular anatomy of plants. The ultrasonic, non-invasive characterization of internal vessel dimensions can lead to breakthroughs in speed and accuracy in plant phenotyping and disease detection in agriculture.


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