285 research outputs found
2,4-Dibromo-6-{(E)-[(R)-1-phenylÂethyl]iminoÂmethÂyl}phenol
In the title Schiff base, C15H13Br2NO, the benzene and phenyl rings form a dihedral angle of 75.18 (13)°. The N=C bond length of 1.263 (6) Å is shorter than of the N—C bond [1.476 (5) Å], indicating a double bond. In the crystal, there is some pseudosymmetry. This occurs because most of the two molÂecules are centrosymmetrically related. The molÂecular structure is stabilized by intraÂmolecular O—H⋯N hydrogen bonds
Shewanella soft tissue infection: case report and literature review
SummaryObjectiveTo better understand the clinical characteristics of soft tissue infections caused by Shewanella in humans.MethodsWe report a case of Shewanella soft tissue infection and review the English literature from a search of PubMed.ResultsA total of 27 adults (mean age 61.1±16.0 years) with soft tissue infections caused by Shewanella were included for analysis. Limb involvement was found in 22 (81.5%) patients, while scalp, face, perineum, lacrimal sac, and abdominal wall involvement were each found in one patient. Chronic ulcer over the leg (14 cases (51.9%)), steroid use (four cases (14.8%)), and liver cirrhosis (three cases (11.1%)) were the major underlying conditions. Shewanella bacteremia was found in 14 out of 22 patients with soft tissue infections involving the limbs. Two patients died of septicemia, giving a mortality rate of 7.4%.ConclusionsShewanella soft tissue infections usually develop in immunocompromised patients with a preexisting cutaneous ulcer (particularly over the legs) after marine environment or seawater exposure. In view of the possible catastrophic consequences, education on the prevention of Shewanella soft tissue infections in at-risk people (e.g., the immunocompromised or elderly with a cutaneous ulcer) relating the need to avoid exposure to the marine environment or seawater may be of importance
Photoluminescence Study of Hydrothermally Grown ZnO Nanostructures
In this work, the hydrothermally grown ZnO nanostructures were successfully prepared using the aqueous solution of zinc nitride dehydrate (Zn(NO3)2). The effect of solution molarity on the optical and structural properties of ZnO nanostructures were studied by temperature dependent photoluminescence (PL) measurements. The intensity ratio of the ultraviolet emission to the visible emission is calculated. It is found that the calculated results are also dependent on the solution molarity and consistent with the crystal quality of ZnO nanostructures
Field Evaluation of Four Low-cost PM Sensors and Design, Development and Field Evaluation of A Wearable PM Exposure Monitoring System
To mitigate the significant biases/errors in research studying the
associations between PM and health, which are introduced by the
coarse/inadequate assessments of PM exposure from conventional PM monitoring
paradigm, a personalized monitoring system consisting of a low-cost wearable PM
device is proposed. However, due to the absence of a unifying evaluation
protocol for low-cost PM sensors, the evaluation results/performance
specifications from existing studies/datasheets are of limited reference values
when attempting to determine the best candidate for the proposed system. In
this regard, the authors appeal to the research community to develop a
standardized evaluation protocol for low-cost PM sensors/devices, and a
unifying attempt is established in this manuscript by adopting the definitive
terminology from international documents and the evaluation metrics regarded as
best practices. Collocated on the rooftop of the HKUST Supersite, four
empirically selected PM sensors were compared against each other and calibrated
against two reference monitors. They were then evaluated against the reference
following the protocol. The PlanTower PMS-A003 sensor was selected for the
wearable device as it outperformed the others in terms of affordability,
portability, detection capability, data quality, as well as humidity and
condensation insusceptibility. An automated approach was proposed to identify
and remove the condensation associated abnormal measurements. The proposed
device has better affordability and portability as well as similar usability
and data accessibility compared to those existing devices recognized. The first
10 devices were also evaluated and calibrated at the Supersite. Additional 120
units were manufactured and delivered to the subjects to acquire their daily
PM2.5 exposures for investigating the association with subclinical
atherosclerosis
Separation and economic recovery of strontium from Nanyishan oil-field water, China
The mass ratio of Ca to Sr is greater than 10 in Nanyishan oil-field water, which causes significant problems during the economic extraction and recovery of selected trace elements in the oil-field water. The oilfield water was isothermally evaporated and various salts such as Li, K, Mg, Ca, Na, Sr, Rb, Cs, Br, and I were obtained from the solution. The Sr content of each phase was determined by ICP-AES, the Sr distribution rule in this process was obtained, and the best separation stage for Sr was identified, to optimize the separation of Sr from Nanyishan oil-field water
Effect of Oral Administration of Enterococcus faecium Ef1 on Innate Immunity of Sucking Piglets
The objective of this study was to evaluate the effect of orally administered Enterococcus faecium EF1 on innate immune responses of jejunal mucosa in newborn piglets. Twenty-four commercial crossbred healthy newborn piglets were randomly divided into two groups, control (T0) and treatment (T1) group. Each group consists of 12 piglets. T1 was administered sterilized skim milk 2 ml piglet-1 day-1 with addition of E. faecium EF1 (5~6×108 cfu/ml) by oral gavage on alternative odd days (1st, 3rd and 5th) after birth. T0 fed with the same volume of sterilized skim milk without probiotics. The merciful killing of piglets at the 25th day after birth was performed to collect the samples of jejunal mucosa to measure the innate cytokine responses and the Toll-like receptors gene expression by quantitative real time PCR. The results showed that TGF-β1 and TNF-α concentrations increased and mRNA expression levels also improved significantly in T1 as compared to T0. While, the production of IFN-γ and IL-8 decreased significantly in T1 and gene expression modification was not observed. In addition, TLR (Toll-like receptor) 2 and TLR 9 transcription levels were up-regulated in treatment (T1) group. These findings revealed that oral administration of E. faecium EF1 was effective to activate innate immunity and could modulate the TLRs expression in jejunal mucosa of piglets
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