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05:29 EST 19th February 2019 | BioPortfolio

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Showing "Little Bear Laboratories" PubMed Articles 101–125 of 646

Development of an automated image analysis protocol for quantification of intracellular forms of Leishmania spp.

Leishmania parasites cause a set of neglected tropical diseases with considerable public health impact, the leishmaniases, which are often fatal if left untreated. Since current treatments for the leishmaniases exhibit high toxicity, low efficacy and prohibitive prices, many laboratories throughout the world are engaged in research for the discovery of novel chemotherapeutics. This entails the necessity of screening large numbers of compounds against the clinically relevant form of the parasite, the obligat...

Development of Diabetes after Pancreaticoduodenectomy: Results of a 10-Year Series Using Prospective Endocrine Evaluation.

Limited literature is available regarding the development of impaired glucose tolerance and diabetes mellitus after pancreaticoduodenectomy. The primary aim was to define the diabetic phenotype and correlate pre-operative glycemic laboratories to new-onset diabetes after pancreaticoduodenectomy.

Workload measurement for molecular genetics laboratory: A survey study.

Genetic testing availability in the health care system is rapidly increasing, along with the diffusion of next-generation sequencing (NGS) into diagnostics. These issues make imperative the knowledge-drive optimization of testing in the clinical setting. Time estimations of wet laboratory procedure in Italian molecular laboratories offering genetic diagnosis were evaluated to provide data suitable to adjust efficiency and optimize health policies and costs. A survey was undertaken by the Italian Society of ...

Knowledge and misconceptions of Saudi women about sexually transmitted infections.

Sexually transmitted infections (STIs) are increasingly becoming one of the most important health challenges , especially among women, as they bear long-term consequences such as infertility and cervical cancer owing to STIs. This study aimed to assess the knowledge and misconceptions of Saudi women about STIs.

Inter-laboratory validation of a harmonized PNH flow cytometry assay.

A network comprising 11 laboratories aimed to consolidate PNH testing by developing and validating an assay guided by previous guidelines and studies. Network analyses of >20 native samples yielded key findings that were used to create and reshape the final protocol.

Evaluation of the Mitra microsampling device for use with key urinary metabolites in patients with Alkaptonuria.

Alkaptonuria is a disorder of tyrosine metabolism where elevated circulating homogentisic acid causes progressive dysfunction of collagenous tissues. Logistical, financial and patient experience concerns with collection and transport of specimens to central laboratories makes evaluation of microsampling attractive.

Quality Control Project of NGS HLA Genotyping for the 17 International HLA and Immunogenetics Workshop.

The 17 International HLA and Immunogenetics Workshop (IHIW) organizers conducted a Pilot Study (PS) in which 13 laboratories (15 groups) participated to assess the performance of the various sequencing library preparation protocols, NGS platforms and software in use prior to the workshop. The organizers sent 50 cell lines to each of the 15 groups, scored the 15 independently generated sets of NGS HLA genotyping data, and generated "consensus" HLA genotypes for each of the 50 cell lines. Proficiency Testing ...

Endothelial Cell-Derived Extracellular Vesicles Mitigate Radiation- Induced Hematopoietic Injury.

Extracellular vesicles (EVs) are shed vesicles that bear a combination of nucleic acids and proteins. EVs are becoming recognized as a mode of cell-to-cell communication. Since hematopoietic stem cells (HSCs) reside in proximity to endothelial cells (ECs), we investigated whether EC-derived EVs could regulate HSC regeneration following ionizing radiation.

Racial disparities in perioperative outcomes after bariatric surgery.

NonHispanic black patients bear a disproportionate burden of the obesity epidemic and its related medical co-morbidities. While bariatric surgery is the most effective treatment for morbid obesity, black patients access bariatric surgery at lower rates than nonHispanic white patients.

Development and validation of different indirect ELISAs for MERS-CoV serological testing.

Since 2012, MERS-CoV has caused up to 2220 cases and 790 deaths in 27 countries with Saudi Arabia being the most affected country with ~83.1% of the cases and ~38.8% local death rate. Current serological assays such as microneutralization (MN), plaque reduction neutralization, immunofluorescence, protein microarray or pseudoparticle neutralization assays rely on handling of live MERS-CoV in high containment laboratories or need for expensive and special equipment and reagents and highly trained personnel wh...

A Review of Therapeutics in Clinical Development for Respiratory Syncytial Virus and Influenza in Children.

Respiratory syncytial virus (RSV) and influenza are important viral pathogens worldwide. Children, in particular, bear considerable burdens of morbidity and mortality associated with these viruses. There are limited therapeutic options for children infected with RSV or influenza. This review focuses on therapeutics for RSV and influenza that are currently under clinical investigation.

Testing Animal Anxiety in Rats: Effects of Open Arm Ledges and Closed Arm Wall Transparency in Elevated Plus Maze Test.

The elevated plus maze test is a behavioral test for assessing animal anxiety in rodents. Although this test is widely applied in the field of behavioral science, conflicting outcomes are often provided from different laboratories. To identify reasons for the different outcomes, we previously focused on arm features, which differ between laboratories, most notably the presence/absence of ledges at the sides of open arms and the transparency/opaqueness of closed arm walls. In a previous report, we used a cus...

Advantages, disadvantages and optimization of one-stage and chromogenic factor activity assays in haemophilia A and B.

Haemophilia A and B diagnosis and disease severity classification are determined on the basis of results from factor VIII (FVIII) and factor FIX (FIX) activity assays, respectively. These assays are also used for potency labelling, postinfusion monitoring of factor replacement products and testing for FVIII/FIX inhibitors. This review focuses on activated partial thromboplastin time (APTT)-based one-stage assays (OSAs) and two-stage chromogenic substrate assays (CSAs). Currently, there is considerable inter...

Artificial blood feeding for Culicidae colony maintenance in laboratories: does the blood source condition matter?

Culicidae colonization in laboratory is paramount to conduct studies aiming at a better understanding of mosquitoes' capacity to transmit pathogens that cause deadly diseases. Colonization requires female blood feeding, a necessary step for maturation of female's oocytes. Direct blood feeding on anesthetized mammals implies in a number of disadvantages when compared to artificial blood feeding. Consequently, laboratories worldwide have been trying to -feed female mosquitoes artificially in order to replace ...

Laboratory-acquired scrub typhus and murine typhus infections: The argument for risk-based approach to biosafety requirements for Orientia tsutsugamushi and Rickettsia typhi laboratory activities.

This study examined the literature on laboratory-acquired infections (LAIs) associated with scrub typhus (Orientia tsutsugamushi) and murine typhus (Rickettsia typhi) research to provide an evidence base for biosafety and biocontainment. Scrub typhus LAIs were documented in 25 individuals, from 1931-2000 with 8 (32%) deaths during the pre-antibiotic era. There were 35 murine typhus LAI reports and no deaths. Results indicated that highest risk activities were working with infectious laboratory animals invol...

How to Generate a More Accurate Laboratory-Based International Normalized Ratio: Solutions to Obtaining or Verifying the Mean Normal Prothrombin Time and International Sensitivity Index.

Although the landscape of anticoagulation therapy is evolving, vitamin K antagonists (VKAs) such as warfarin remain an anticoagulant of choice for many clinicians and their patients. Nevertheless, management of VKA therapy remains challenging, largely because of patient variability and drug and food interactions; thus, VKA dosing has to be personalized. This is achieved by regular monitoring using a test called the , mathematically converted to an international normalized ratio (INR). The INR system is mean...

Optical Versus Virtual Microscope for Medical Education: A Systematic Review.

Many technological innovations have changed the traditional practice of medical education and clinical practice. Whole slide imaging (WSI) technology provided an unique way of viewing conventional glass slides in histology and pathology laboratories. The WSI technology digitalized glass slide images and made them readily accessible via the Internet using tablets or computers. Users utilized the pan-and-zoom function to view digital images of slides, also referred to as the virtual microscope (VM), simulatin...

Screening for Syphilis with Dual Algorithms: Analysis of Discordant and Concordant Serology Results in a Population with a Low Prevalence of Syphilis.

Currently, many laboratories have switched the traditional screening algorithm (TSA) to reverse screening algorithm (RSA) for the efficiencies in high-volume syphilis screening. However, confusions have been arisen regarding this paradigm shift.

Multi-centric evaluation of the online MSI platform for the identification of cryptic and rare species of Aspergillus by MALDI-TOF.

The taxonomy of Aspergillus species has recently been revolutionized with the introduction of cryptic species and section concepts. However, their species-level identification in routine laboratories remains a challenge. The aim of this study was to prospectively assess the identification accuracy of cryptic species of Aspergillus in various laboratories using the mass spectrometry identification (MSI) platform, an independent and freely accessible online mass spectrometry database. Over a 12-month period, ...

In vitro developmental competence of horse embryos derived from oocytes with a different corona radiata cumulus-oocyte morphology.

The increase in demand for in vitro produced horse embryos is fostering the development of commercial laboratories for this purpose. Nevertheless, blastocyst production after intracytoplasmic sperm injection (ICSI) is still not as great as desired in most of these laboratories. In relation to horse oocyte classification, both expanded and compact cumulus-oocyte-complexes (COCs) are used for in vitro embryo production. The aim of this study was to compare in vitro embryo developmental capacity of COCs from h...

Performance evaluation of HbA1c measurement systems with sigma metric for 1066 laboratories in China.

This study aimed to evaluate the performance of HbA1c measurement systems quantitatively with sigma metric and promote the quality improvement.

Inter-laboratory Test for oxygen and hydrogen stable isotope analyses of Geothermal Fluids: Assessment of Reservoir Fluid Compositions.

Knowledge of the accuracy and precision for oxygen (δ O values) and hydrogen (δ H values) stable isotope analyses of geothermal fluid samples is important to understand geothermal reservoir processes, such as partial boiling-condensation and encroachment of cold and reinjected waters. The challenging aspects of the analytical techniques for this specific matrix include memory effects and higher scatter of delta values with increasing total dissolved solids (TDS) concentrations, deterioration of Pt-catalys...

Insufficient harmonization of antibiotics assays - Polish experience with an external quality assessment program in the years 2011-2018.

Treatment with vancomycin and gentamycin requires strict monitoring of its serum concentration for proper dosage optimization. This study aimed to assess the quality and the harmonization of antibiotics assays in Polish laboratories.

Future time perspective, loneliness, and depressive symptoms among middle-aged adults: A mediation model.

Recent studies have demonstrated the relevance of subjective time perceptions with regard to depressive symptoms among aging and older adults. Moreover, loneliness was found to bear a strong connection to such symptoms. However, little is known about the connection between the three constructs. Accordingly, the current research examines whether the connection between future time perspective and depressive symptoms is mediated by loneliness.

Seasonal variation of Cesium-137 concentration in Asian black bear (Ursus thibetanus) and wild boar (Sus scrofa) in Fukushima Prefecture, Japan.

To elucidate and reduce the risk of radionuclide contamination in wildlife caused by the Tokyo Electric Power Company Fukushima Dai-ichi Nuclear Power Station accident, it is important to understand radionuclide variations in the wild animal population. Here, we used environmental monitoring data and muscle samples collected from Asian black bear (Ursus thibetanus) and wild boar (Sus scrofa) from May 2011 to March 2016 to examine seasonal variation in radiocesium (137Cs) concentrations in muscle tissues (he...

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