Models and approaches to attack surface analysis for fuzz testing of the Linux kernel

The purpose of the study was to analyze possible methods for determining the attack surface in relation to solving the problem of fuzzing testing the kernel of operating systems of the Linux family and selecting the most suitable one. To evaluate and compare various models and practical approaches to attack surface analysis, as well as assess the possibility of combining them, theoretical research methods such as analysis, comparison, and deduction were used. Existing models and approaches to analyzing the attack surface of the Linux kernel are assessed and compared. A solution is proposed for the practical determination of the attack surface for effective testing of the kernel using the fuzzing method, which combines the studied approaches. The results of the study can be used to practically construct an attack surface, which will allow us to more accurately determine the goals of fuzz testing of the Linux kernel

Observation of time quasicrystal and its transition to superfluid time crystal

We report experimental realization of a quantum time quasicrystal, and its transformation to a quantum time crystal. We study Bose-Einstein condensation of magnons, associated with coherent spin precession, created in a flexible trap in superfluid $^3$He-B. Under a periodic drive with an oscillating magnetic field, the coherent spin precession is stabilized at a frequency smaller than that of the drive, demonstrating spontaneous breaking of discrete time translation symmetry. The induced precession frequency is incommensurate with the drive, and hence the obtained state is a time quasicrystal. When the drive is turned off, the self-sustained coherent precession lives a macroscopically-long time, now representing a time crystal with broken symmetry with respect to continuous time translations. Additionally, the magnon condensate manifests spin superfluidity, justifying calling the obtained state a time supersolid or a time super-crystal

Converse Magnetoelectric Composite Resonator for Sensing Small Magnetic Fields

Magnetoelectric (ME) thin film composites consisting of sputtered piezoelectric (PE) and magnetostrictive (MS) layers enable for measurements of magnetic fields passively, i.e. an AC magnetic field directly generates an ME voltage by mechanical coupling of the MS deformation to the PE phase. In order to achieve high field sensitivities a magnetic bias field is necessary to operate at the maximum piezomagnetic coefficient of the MS phase, harnessing mechanical resonances further enhances this direct ME effect size. Despite being able to detect very small AC field amplitudes, exploiting mechanical resonances directly, implies a limitation to available signal bandwidth along with the inherent inability to detect DC or very low frequency magnetic fields. The presented work demonstrates converse ME modulation of thin film Si cantilever composites of mesoscopic dimensions (25 mm × 2.45 mm × 0.35 mm), employing piezoelectric AlN and magnetostrictive FeCoSiB films of 2 µm thickness each. A high frequency mechanical resonance at about 515 kHz leads to strong induced voltages in a surrounding pickup coil with matched self-resonance, leading to field sensitivities up to 64 kV/T. A DC limit of detection of 210 pT/Hz1/2 as well as about 70 pT/Hz1/2 at 10 Hz, without the need for a magnetic bias field, pave the way towards biomagnetic applications

Archaea dominate the microbial community in an ecosystem with low-to-moderate temperature and extreme acidity

[Background] The current view suggests that in low-temperature acidic environments, archaea are significantly less abundant than bacteria. Thus, this study of the microbiome of Parys Mountain (Anglesey, UK) sheds light on the generality of this current assumption. Parys Mountain is a historically important copper mine and its acid mine drainage (AMD) water streams are characterised by constant moderate temperatures (8–18 °C), extremely low pH (1.7) and high concentrations of soluble iron and other metal cations.[Results] Metagenomic and SSU rRNA amplicon sequencing of DNA from Parys Mountain revealed a significant proportion of archaea affiliated with Euryarchaeota, which accounted for ca. 67% of the community. Within this phylum, potentially new clades of Thermoplasmata were overrepresented (58%), with the most predominant group being “E-plasma”, alongside low-abundant Cuniculiplasmataceae, ‘Ca. Micrarchaeota’ and ‘Terrestrial Miscellaneous Euryarchaeal Group’ (TMEG) archaea, which were phylogenetically close to Methanomassilicoccales and clustered with counterparts from acidic/moderately acidic settings. In the sediment, archaea and Thermoplasmata contributed the highest numbers in V3-V4 amplicon reads, in contrast with the water body community, where Proteobacteria, Nitrospirae, Acidobacteria and Actinobacteria outnumbered archaea. Cultivation efforts revealed the abundance of archaeal sequences closely related to Cuniculiplasma divulgatum in an enrichment culture established from the filterable fraction of the water sample. Enrichment cultures with unfiltered samples showed the presence of Ferrimicrobium acidiphilum, C. divulgatum, ‘Ca. Mancarchaeum acidiphilum Mia14’, ‘Ca. Micrarchaeota’-related and diverse minor (< 2%) bacterial metagenomic reads.[Conclusion] Contrary to expectation, our study showed a high abundance of archaea in this extremely acidic mine-impacted environment. Further, archaeal populations were dominated by one particular group, suggesting that they are functionally important. The prevalence of archaea over bacteria in these microbiomes and their spatial distribution patterns represents a novel and important advance in our understanding of acidophile ecology. We also demonstrated a procedure for the specific enrichment of cell wall-deficient members of the archaeal component of this community, although the large fraction of archaeal taxa remained unculturable. Lastly, we identified a separate clustering of globally occurring acidophilic members of TMEG that collectively belong to a distinct order within Thermoplasmata with yet unclear functional roles in the ecosystem.The work of OVG, PNG and SVT was supported by the Royal Society UK-Russia Exchange Grant #IE 160224 (RFBR 16-54-10072 КО project). OVG and PNG acknowledge ERA Net IB2 Project MetaCat through UK Biotechnology and Biological Sciences Research Council (BBSRC) Grant BB/M029085/1 and the support of the Centre of Environmental Biotechnology Project funded by the European Regional Development Fund (ERDF) through the Welsh Government. RB and PNG acknowledge the support of the Supercomputing Wales project, which is part-funded by the European Regional Development Fund (ERDF) via the Welsh Government. The work of AAK and IVK was supported by the Russian Science Foundation grant # 18-44-04024. MF acknowledges grants PCIN-2014-107 (within ERA NET IB2 grant ERA-IB-14-030—MetaCat), PCIN-2017-078 (within the Marine Biotechnology ERA-NET (ERA-MBT) funded under the European Commission’s Seventh Framework Programme, 2013-2017, Grant agreement 604814), BIO2014-54494-R and BIO2017-85522-R from the Spanish Ministry of Economy and Competitiveness

Expression of microRNAs in cerebrospinal fluid of dogs with central nervous system disease

Abstract In this pilot study we investigated the expression of 14 microRNAs in the cerebrospinal fluid (CSF) of dogs with neoplastic, inflammatory and degenerative disorders affecting the central nervous system (CNS). CSF microRNA (miRNA) expression profiles were compared to those from dogs with neurological signs but no evidence of structural or inflammatory CNS disease. Seven miRNAs were easily detected in all samples: miR-10b-5p, miR-19b, miR-21-5p, miR-30b-5p, miR-103a-3p, miR-124, and miR-128-3p. Expression of miR-10b-5p was significantly higher in the neoplastic group compared to other groups. There was no relation between miRNA expression and either CSF nucleated cell count or CSF protein content. Higher expression of miR-10b-5p in the neoplastic group is consistent with previous reports in human medicine where aberrant expression of miR-10b is associated with various neoplastic diseases of the CNS

Follicular Occlusion Syndrome — a Possible Option of Follicular-Retension Origin of Pilonidal Sinus

Аim: to analyze and evaluate the clinical and morphological manifestations of pilonidal sinus disease (PSD) as a part of follicular occlusion syndrome (FOS).Materials and methods. In the Clinic of Coloproctology and Minimally Invasive Surgery, 80 patients with PSD underwent surgeries from November 2018 to December 2019: 62 (77.5 %) patients — with primary PSD, 18 (22.5 %) — with recurrence of the disease.Results. There were 80 patients, 6 patients (9.7 %) with primary and one (5.6 %) patient with recurrent cyst had concomitant manifestations of follicular occlusion syndrome. Thus, the frequency of combination of PSD with other variants of FOS course amounted to 8.8 %. Hidradenitis suppurativa of axillary and inguinal areas was found in 5 out of 7 patients. Acne conglobata, as one of the components of FOS, was noted in three patients. Dissecting cellulitis of the scalp was diagnosed in one patient. Follicular occlusion triad was observed in two patients. Follicular occlusion tetrad was not noted in any observation. All patients were treated with excision of the pilonidal sinus disease with local tissue-plasty of the defect. At present, no recurrences have been noted in any of the cases, and the mean follow-up time was 14 ± 5.6 months (6–27 months). PSD as a manifestation of follicular occlusion syndrome is characterized by a more cranial and more superficial location of the cavity in the sacrococcygeal region. According to the data of histologic examination of patients with FOS, the morphologic picture is identical with patients with isolated PSD. All patients with confirmed FOS have received pathogenetic local and conservative therapy. After the therapy remission of combined diseases is noted.Conclusion. Deroofing of the lining of the cavity, often used in dermatologic practice, along with complex treatment within the framework of multidisciplinary (together with a dermatologist) management of patients with FOS, looks promising

The clinician's view on the advantages and contradictions of the new nomenclature of steatotic liver disease: A review

In September 2023, the European Association for the Study of the Liver (EASL) updated the disease nomenclature for non-alcoholic (metabolically associated) fatty liver disease. The goals of the revision were to increase awareness among health care professionals, civil society and patients about the disease, its course, treatment and outcomes; combating stigma; focusing on the initial etiological factor, including the main (cardiometabolic) risk of disease progression; improved diagnosis based on disease biomarkers; positive impact on the potency to search for new drugs; the ability to provide personalized medical care. The terms “non-alcoholic” and “fatty” were considered stigmatizing, and therefore, it was proposed to use the term steatotic liver disease (SLD) as the name of this nosology. The terms non-alcoholic fatty liver disease (NAFLD) or metabolic associated fatty liver disease (MAFLD) have been replaced by the term metabolic dysfunction-associated steatotic liver disease (MASLD). In the case of being combined with an alcohol factor, a diagnosis in which metabolic dysfunction is combined with alcoholic liver disease is referred to as MetALD. The fundamental principle in the diagnosis of MASLD is the presence of at least one of the cardiometabolic risk factors. Alcohol consumption interacts with cardiometabolic risk factors and increases the risk of SLD decompensation. The term nonalcoholic steatohepatitis (NASH), according to the new nomenclature, has been replaced by the term metabolic dysfunction-associated steatohepatitis (MASH). The adoption of the new nomenclature should help to increase awareness about the disease, its course and outcomes, as well as improve the quality of diagnosis and treatment

Osteoinduction of Human Mesenchymal Stem Cells by Bioactive Composite Scaffolds without Supplemental Osteogenic Growth Factors

The development of a new family of implantable bioinspired materials is a focal point of bone tissue engineering. Implant surfaces that better mimic the natural bone extracellular matrix, a naturally nano-composite tissue, can stimulate stem cell differentiation towards osteogenic lineages in the absence of specific chemical treatments. Herein we describe a bioactive composite nanofibrous scaffold, composed of poly-caprolactone (PCL) and nano-sized hydroxyapatite (HA) or beta-tricalcium phosphate (TCP), which was able to support the growth of human bone marrow mesenchymal stem cells (hMSCs) and guide their osteogenic differentiation at the same time. Morphological and physical/chemical investigations were carried out by scanning, transmission electron microscopy, Fourier-transform infrared (FTIR) spectroscopy, mechanical and wettability analysis. Upon culturing hMSCs on composite nanofibers, we found that the incorporation of either HA or TCP into the PCL nanofibers did not affect cell viability, meanwhile the presence of the mineral phase increases the activity of alkaline phosphatase (ALP), an early marker of bone formation, and mRNA expression levels of osteoblast-related genes, such as the Runt-related transcription factor 2 (Runx-2) and bone sialoprotein (BSP), in total absence of osteogenic supplements. These results suggest that both the nanofibrous structure and the chemical composition of the scaffolds play a role in regulating the osteogenic differentiation of hMSCs

Preclinical Models of Brain Metastasis

Research at the Brain Metastasis Group is supported by MINECO grants MINECO-Retos SAF2017-89643-R (M.V.), Bristol-Myers Squibb- Melanoma Research Alliance Young Investigator Award 2017 (498103) (M.V.), Beug Foundation’s Prize for Metastasis Research 2017 (M.V.), Fundación Ramón Areces (CIVP19S8163) (M.V.), Worldwide Cancer Research (19-0177) (M.V.), H2020-FETOPEN (828972)N

Monocytes induce STAT3 activation in human mesenchymal stem cells to promote osteoblast formation

A major therapeutic challenge is how to replace bone once it is lost. Bone loss is a characteristic of chronic inflammatory and degenerative diseases such as rheumatoid arthritis and osteoporosis. Cells and cytokines of the immune system are known to regulate bone turnover by controlling the differentiation and activity of osteoclasts, the bone resorbing cells. However, less is known about the regulation of osteoblasts (OB), the bone forming cells. This study aimed to investigate whether immune cells also regulate OB differentiation. Using in vitro cell cultures of human bone marrow-derived mesenchymal stem cells (MSC), it was shown that monocytes/macrophages potently induced MSC differentiation into OBs. This was evident by increased alkaline phosphatase (ALP) after 7 days and the formation of mineralised bone nodules at 21 days. This monocyte-induced osteogenic effect was mediated by cell contact with MSCs leading to the production of soluble factor(s) by the monocytes. As a consequence of these interactions we observed a rapid activation of STAT3 in the MSCs. Gene profiling of STAT3 constitutively active (STAT3C) infected MSCs using Illumina whole human genome arrays showed that Runx2 and ALP were up-regulated whilst DKK1 was down-regulated in response to STAT3 signalling. STAT3C also led to the up-regulation of the oncostatin M (OSM) and LIF receptors. In the co-cultures, OSM that was produced by monocytes activated STAT3 in MSCs, and neutralising antibodies to OSM reduced ALP by 50%. These data indicate that OSM, in conjunction with other mediators, can drive MSC differentiation into OB. This study establishes a role for monocyte/macrophages as critical regulators of osteogenic differentiation via OSM production and the induction of STAT3 signalling in MSCs. Inducing the local activation of STAT3 in bone cells may be a valuable tool to increase bone formation in osteoporosis and arthritis, and in localised bone remodelling during fracture repair