Repozytorium Uniwersytetu Śląskiego RE-BUŚ
Not a member yet
23505 research outputs found
Sort by
Supracondylar Fractures of the Humerus: Association of Neurovascular Lesions with Degree of Fracture Displacement in Children - A Retrospective Study
Full text linkSupracondylar humerus fractures (ScHF) account for 60% of fractures of the elbow region
in children. We assessed the relationship between neurovascular complications and the degree of
fracture displacement as rated on the basis of modified Gartland classification. Moreover, we aimed to
evaluate predisposing factors, e.g., age and gender, and outcomes of neurovascular complications in
ScHF. Between 2004 and 2019, we treated 329 patients with ScHF at the Department of Traumatology
and Orthopedics of the Upper Silesian Child Centre, Katowice, Poland. Mean age of patients
(189 boys and 140 girls) was 7.2 years (Confidence interval: 6.89, 7.45). Undisplaced fractures were
treated conservatively with a cast. Displaced fractures were managed by closed reduction and
percutaneous Kirschner wire fixation using two pins inserted laterally. We retrospectively assessed
the number of neurovascular lesions at baseline and recorded any iatrogenic injury resulting from
the surgical intervention. Acute neurovascular lesions occurred in 44 of 329 ScHF patients (13.4%).
The incidence of accompanying neurovascular injuries was positively associated with the severity of
fracture displacement characterized by Gartland score. Vascular injuries occurred mainly in Gartland
type IV ScHF, while nerve lesions occurred in both Gartland type III and IV ScHF. We noted a
significantly higher mean Gartland score and mean age at injury in the group of children suffering
from neurovascular injuries when compared to those in the group without such injuries (p = 0.045
and p = 0.04, respectively). We observed no secondary nerve lesions after surgical treatment. For
the treatment of ScHF in children, we recommend closed reduction and stabilization of displaced
fractures with K-wires inserted percutaneously from the lateral aspect of the upper arm. We advocate
vessel exploration in case of absent distal pulses after closed reduction but do not consider primary
nerve exploration necessary, unless a complete primary sensomotoric nerve lesion is present
High-Throughput Sequencing-Based Analysis of Rhizosphere and Diazotrophic Bacterial Diversity Among Wild Progenitor and Closely Related Species of Sugarcane (Saccharum spp. Inter-Specific Hybrids)
Full text linkConsidering the significant role of genetic background in plant-microbe interactions and
that most crop rhizospheric microbial research was focused on cultivars, understanding
the diversity of root-associated microbiomes in wild progenitors and closely related
crossable species may help to breed better cultivars. This study is aimed to fill a critical
knowledge gap on rhizosphere and diazotroph bacterial diversity in the wild progenitors
of sugarcane, the essential sugar and the second largest bioenergy crop globally. Using a
high-throughput sequencing (HTS) platform, we studied the rhizosphere and diazotroph
bacterial community of SaccharumofficinarumL. cv. Badila (BRS), Saccharumbarberi (S.
barberi) Jesw. cv Pansahi (PRS), Saccharum robustum [S. robustum; (RRS), Saccharum
spontaneum (S. spontaneum); SRS], and Saccharum sinense (S. sinense) Roxb. cv Uba
(URS) by sequencing their 16S rRNA and nifH genes. HTS results revealed that a total
of 6,202 bacteria-specific operational taxonomic units (OTUs) were identified, that were
distributed as 107 bacterial groups. Out of that, 31 rhizobacterial families are commonly
spread in all five species. With respect to nifH gene, S. barberi and S. spontaneum
recorded the highest and lowest number of OTUs, respectively. These results were
validated by quantitative PCR analysis of both genes. A total of 1,099 OTUs were identified for diazotrophs with a core microbiome of 9 families distributed among all the
sugarcane species. The core microbiomes were spread across 20 genera. The increased
microbial diversity in the rhizosphere was mainly due to soil physiochemical properties.
Most of the genera of rhizobacteria and diazotrophs showed a positive correlation,
and few genera negatively correlated with the soil properties. The results showed
that sizeable rhizospheric diversity exists across progenitors and close relatives. Still,
incidentally, the rhizosphere microbial abundance of progenitors of modern sugarcane
was at the lower end of the spectrum, indicating the prospect of Saccharum species
introgression breeding may further improve nutrient use and disease and stress tolerance
of commercial sugarcane. The considerable variation for rhizosphere microbiome seen
in Saccharum species also provides a knowledge base and an experimental system for
studying the evolution of rhizobacteria-host plant association during crop domestication
Application of a three-dimensional scanner to the quantitative assessment of the nail plate condition after a hybrid manicure procedure - preliminary study
Full text linkBackground: About 90% of women worldwide use nail care products, including manicure
ones. A manicure procedure results in nail damage, therefore it is necessary to
search for new, objective methods of assessing the impact of the procedures and products
applied within the nail plate. In this study, an attempt was made to quantify the
impact of manicure procedures on the nail plate condition.
Materials and methods: Twenty thumb nail plates were examined. Before the manicure
procedures, alginate casts were prepared for each of the subjects. The analysis of
the three-dimensional (3D) nail surface structure included the assessment of the nail
sections and the assessment of differences in the nail structure after superposition of
3D images of the nail plates before and after themanicure procedures.
Results: The obtained results show that the nail plate structure changed to a similar
extent in each measured section after the manicure procedure. A change in the height
of the nails is not a desirable phenomenon as it suggests damage to the nail caused by
the substances included in the preparations applied to the nails, acetone, or filing the
nail plate. This proves the great influence of the technique of removing artificial nails
on the structure of the natural plate.
Conclusion: The use of a 3D scanner allows for precise, biometric, quantitative, and
repeatable measurements of changes in the nail structure after amanicure procedure.
The use of the hybrid and gelmanicure procedure causes significant damage to the nail
plate, especially in its distal portion
Gaston Bachelard, il “non-psicanalista”
Full text linkSi potrebbero definire quantomeno variabili, i rapporti della filosofia di Gaston
Bachelard con la psicanalisi; quando non esplicitamente turbolenti. I punti di contatto
e le rotture, i distacchi e i riavvicinamenti, le critiche e le riformulazioni dei
concetti-chiave della disciplina – a testimonianza dell’attitudine ambigua che il
filosofo nutriva nei suoi confronti – si intrecciano ai mutamenti già insiti nella sua
riflessione filosofica. D’altronde, il movimento psicanalitico nel suo senso più ampio
ha sempre tratto linfa vitale dalla diversificazione delle sue proposte teoriche
e metodologiche [...]
Symplasmic communication – supracellular system of regulation of cell differentiation
No full textPlasmodesmata (PD), discovered more than 120 years ago, are still a mystery about their role in regulating plant cell differentiation. Research in recent years has verified our idea about the structure of PD and their function in the exchange of information between cells of the plant body. The involvement of PD in the movement of proteins, including transcription factors, hormones, and various types of RNA, indicates that they play an important role in regulating cell differentiation. The movement of molecules through PD is called symplasmic communication, and its limitations or absence are an essential element in controlling the direction of cell differentiation
Identification of Water Contamination Sources Using Hydrochemical and Isotopic Studies-The Kozłowa Góra Reservoir Catchment Area (Southern Poland)
Full text linkThe application of combined research methods, such as hydrochemical and isotopic analyses,
facilitates understanding of the origin of water constituents and migration of contaminants in the
aquatic environment. The presented study attempts to identify contamination sources affecting water
quality within the Kozłowa Góra reservoir catchment area (southern Poland). A total of 100 water
samples were collected from surface water (the Brynica river, streams, and the reservoir) and groundwater
(a Quarternary aquifer) in four time periods. During fieldwork, the physicochemical parameters
were measured (temperature, pH, electrical conductivity, redox potential, and dissolved oxygen).
The chemical analysis included the determination of major ions (HCO3
, SO4
2, Cl, Ca2+, Mg2+,
Na+, and K+), nutrients (NO3
, NO2
, NH4
+, and PO4
3), and total organic carbon. The study
was complemented by isotopic analysis of sulphur and oxygen in sulphate, which enabled a more
precise identification of stressors affecting water quality in different parts of the catchment area.
Chemical and isotopic results ( 34S = 4.38–13.99‰; 18O 3.59–13.30‰) revealed that wastewater
discharges and agricultural activities have a significant influence on the chemistry of the Brynica
River and other streams. At some sampling points, a lower quality of water was manifested by
elevated concentrations of NO3
(up to 22.6 mg/L) and several other ions (e.g., up to 114 mg/L
for Cl, up to 51.52 mg/L for NH4
+, and 12.5 mg/L for PO4
3). The quality of groundwater was
deteriorated mainly by infiltration of sewage from leaky septic tanks. The level of groundwater
contamination varied depending on the location, as higher concentrations of major ions and values of
electrical conductivity were observed in residential areas. The Brynica river, streams, and groundwater
recharge the drinking water reservoir, and thus its quality depends on these sources. A dilution of
water and the presence of biochemical processes led to a reduction of contaminant concentrations in
the Kozłowa Góra reservoir (down to 3.5 mg/L for NO3
, 32 mg/L for Cl, 0.21 mg/L for NH4
+,
and <0.05 mg/L for PO4
3) compared to water in the river and streams supplying the reservoir. The
study revealed the role of wastewater discharge and agricultural activities in the evolution of surface
water chemistry. The results will be used in further research on the origin and migration of other
substances in water, including microcontaminants
Subnanometer Topological Tuning of the Liquid Intrusion/Extrusion Characteristics of Hydrophobic Micropores
Full text linkIntrusion (wetting)/extrusion (drying) of liquids in/from
lyophobic nanoporous systems is key in many fields, including chromatography,
nanofluidics, biology, and energy materials. Here we demonstrate that secondary
topological features decorating main channels of porous systems dramatically
affect the intrusion/extrusion cycle. These secondary features, allowing an
unexpected bridging with liquid in the surrounding domains, stabilize the water
stream intruding a micropore. This reduces the intrusion/extrusion barrier and the
corresponding pressures without altering other properties of the system. Tuning
the intrusion/extrusion pressures via subnanometric topological features
represents a yet unexplored strategy for designing hydrophobic micropores.
Though energy is not the only field of application, here we show that the proposed
tuning approach may bring 20−75 MPa of intrusion/extrusion pressure increase,
expanding the applicability of hydrophobic microporous materials
“Rely on Allah, not on your equipment”. Modus operandi and all errors of Tsarnaev Brother
Full text linkThe article analyses modus operandi of perpetrators who carried out the bomb attack during the Boston Marathon on 15 April 2013. The author indicates the consequences of using this type of IED and explains how the location of the bombs affected the number of casualties. The article includes an analysis of the bombers’ tactics and the course of action beginning with the detonation of the bombs and ending with the apprehension of the last perpetrator. Moreover, the analysed attack shows something which does not receive enough attention – that terrorists make errors and act in a chaotic manner. A detailed analysis of the bombers’ preparation, behavior and modus operandi showed how poorly trained, insecure and chaotic the terrorists were. The slogan “Rely on Allah, not on your equipment”, popular in the jihadist media, has proved to be deceptive
Interfacial Polarization Phenomena in Compressed Nanowires of SbSI
Full text linkThe systematic studies of the extrinsic Maxwell–Wagner–Sillars polarization process in compressed antimony sulfoiodide (SbSI) nanowires are carried out by dielectric spectroscopy. The dielectric response is studied in temperature (100 T 350) K and frequency (103 f 106) Hz ranges. Dielectric functions commonly used for the analysis of dielectric spectra related to intrinsic polarization processes were applied in the elaboration of experimental data. It was found that the respective “semi-circles” in the Cole–Cole-type plots display a characteristic pear-like shape for the ferroelectric phase. On the other hand, the data for the paraelectric phase form symmetrical arcs. This response is effectively parametrized using the experimental Cole–Davidson and Cole–Cole functions fitted to the data obtained for the ferroelectric and paraelectric phases, respectively. It
is deduced that the particular shape of spectra in the ferroelectric phase is due to spontaneous polarization, which is responsible for an asymmetric broadening of relaxation functions related to the interfacial polarization
Stereoregulation, molecular weight, and dispersity control of PMMA synthesized via free-radical polymerization supported by the external high electric field
Full text linkWe show the remarkable effect of using static (DC) and alternating (AC) electric fields to control the free-radical polymerization of methyl methacrylate (MMA). The magnitude and/or frequency of the applied electric field (up to 154 kV cm−1) were found to control the molecular weight, dispersity, and stereochemistry of the produced polymers