Influence of chitosan coating on the oral bioavailability of gold nanoparticles in rats

Gold nanoparticles are one of the most extensively investigated metallic nanoparticles for several applications. It is less toxic than other metallic nanolattices. The exceptional electrical and thermal conductivity of gold make it possible to be administered as non-invasive radiofrequency irradiation therapy that produces sufficient heat to kill tumor cells. Nanoparticles are generally administered intravenously instead of orally due to negligible oral absorption and cellular uptake. This study evaluated the oral bioavailability of gold nanoparticles coated with chitosan (C-AuNPs), a natural mucoadhesive polymer. We employed traditional method of evaluating bioavailability that involve estimation of maximum concentrations and area under the curve of 3?nm chitosan coated gold nanoparticles (C-AuNPs) in the rat plasma following intravenous and oral administrations (0.8?mg and 8?mg/kg body weight respectively). The oral bioavailability of C-AuNPs was found to be 2.46% (approximately 25 folds higher than polyethylene glycol (PEG) coated gold nanoparticles, reported earlier). These findings suggest that chitosan coating could be better than PEG coating for the enhancement of oral bioavailability of nanoparticles.     

Effectiveness of technology‐enhanced learning in Endodontic education: a systematic review and meta‐analysis

The aim of the present systematic review was to evaluate the effectiveness of technology‐enhanced learning (TEL) in the field of Endodontics to improve educational outcomes compared to traditional learning methods. Randomized controlled studies published in English were identified from two electronic databases (PubMed and Scopus) up to May 2018. Two authors independently performed study selection, data extraction and assessed the risk of bias (ROB). Any teaching method using TEL was considered as the intervention, and this was compared to traditional methods. The outcome measuring the effectiveness of learning activities was evaluated by Kirkpatrick's four‐level training evaluation model. The four levels of training outcomes are as follows: Reaction, Learning, Behaviour and Results. A meta‐analysis was performed to estimate the standardized mean difference (SMD) by the random effects model. In total, 13 studies were included in the systematic review. Only three studies were assessed as ‘low’ ROB. A meta‐analysis could not be performed in the domains of Reaction and Behaviour. No significant difference was observed in knowledge gain (Learning domain) between TEL and traditional methods (SMD, 0.14 (95% CI ?0.10 to 0.39) I² = 62.7%). Similarly, no difference was observed in performance (Behaviour domain). A variable response was found in attitude (Reaction domain). From the available evidence, it can be concluded that TEL is equally as effective as traditional learning methods.     

National survey of perineal trauma and its subsequent management in the United Kingdom

Introduction and hypothesis

Perineal trauma affects approximately 350,000 women per annum in the United Kingdom (UK) and is associated with considerable morbidity. Symptoms are most severe following obstetric anal sphincter injuries (OASIS) compared with other grades of perineal trauma. The Royal College of Obstetricians and Gynaecologists (RCOG) guidelines indicate that the rate of OASIS is 1 % of vaginal deliveries. In 2011, the RCOG implemented the “Maternity Dashboard” so that units could benchmark their performance against national standards of which OASIS is a component. Our primary objective was to establish the national rate of OASIS and audit variations in incidence and management of obstetric perineal trauma.

Methods

We carried out a questionnaire-based survey auditing national practice. Every UK maternity unit was contacted regarding perineal outcomes after all deliveries between January 2009 and January 2010.

Results

215 of the 265 units in the UK responded (81 %). 692,259 of the 790,197 deliveries in the UK for the same period were sampled (88 %). 75 % delivered vaginally. The median national OASIS rate was 2.85 % (0–8 %). 20.2 % of women delivering vaginally had episiotomies; none were midline. 12.4 % of second-degree tears were not repaired in low-risk units compared with 5.9 % in high-risk units. 57.1 % of units used the perineal trauma classification of the RCOG.

Conclusions

This study provides comprehensive data regarding the incidence and management of perineal trauma across the UK. Clinicians and policy-makers, both local and at the RCOG, can devise up-to-date realistic guidelines on the anticipated rate of OASIS and help to assess the compliancy of units with guidelines on the appropriate management of perineal trauma.     

Characterization of T-Cell Responses to Conserved Regions of the HIV-1 Proteome in BALB/c Mice

A likely requirement for a protective vaccine against human immunodeficiency virus type 1 (HIV-1)/AIDS is, in addition to eliciting antibody responses, induction of effective T cells. To tackle HIV-1 diversity by T-cell vaccines, we designed an immunogen, HIVconsv, derived from the most functionally conserved regions of the HIV-1 proteome and demonstrated its high immunogenicity in humans and rhesus macaques when delivered by regimens combining plasmid DNA, nonreplicating simian (chimpanzee) adenovirus ChAdV-63, and nonreplicating modified vaccinia virus Ankara (MVA) as vectors. Here, we aimed to increase the decision power for iterative improvements of this vaccine strategy in the BALB/c mouse model. First, we found that prolonging the period after the ChAdV63.HIVconsv prime up to 6 weeks increased the frequencies of HIV-1-specific, gamma interferon (IFN-γ)-producing T cells induced by the MVA.HIVconsv boost. Induction of strong responses allowed us to map comprehensively the H-2^d-restricted T-cell responses to these regions and identified 8 HIVconsv peptides, of which three did not contain a previously described epitope and were therefore considered novel. Induced effector T cells were oligofunctional and lysed sensitized targets in vitro. Our study therefore provides additional tools for studying and optimizing vaccine regimens in this commonly used small animal model, which will in turn guide vaccine improvements in more expensive nonhuman primate and human clinical trials.     

Gelatin- and Papaya-Based Biodegradable and Edible Packaging Films to Counter Plastic Waste Generation

Most of the food packaging materials used in the market are petroleum-based plastics; such materials are neither biodegradable nor environmentally friendly and require years to decompose. To overcome these problems, biodegradable and edible materials are encouraged to be used because such materials degrade quickly due to the actions of bacteria, fungi, and other environmental effects. In this work, commonly available household materials such as gelatin, soy protein, corn starch, and papaya were used to prepare cost-effective lab-scale biodegradable and edible packaging film as an effective alternative to commercial plastics to reduce waste generation. Prepared films were characterized in terms of Fourier transform infrared spectroscopy (FTIR), water vapor transmission rate (WVTR), optical transparency, and tensile strength. FTIR confirmed the addition of papaya and soy protein to the gelatin backbone. WVTR of the gelatin-papaya films was recorded to be less than 50 g/m²/day. This water vapor barrier was five times better than films of pristine gelatin. The gelatin, papaya, and soy protein films exhibited transparencies of around 70% in the visible region. The tensile strength of the film was 2.44 MPa, which improved by a factor of 1.5 for the films containing papaya and soy protein. The barrier qualities of the gelatin and gelatin-papaya films maintained the properties even after going through 2000 bending cycles. From the results, it is inferred that the prepared films are ideally suitable for food encapsulation and their production on a larger scale can considerably cut down the plastic wastage.     

Hepatitis B-related hepatocellular carcinoma: surveillance strategy directed by immune- epidemiology

Hepatitis B infection (HBV) is one of the most common causes of hepatocellular carcinoma (HCC) worldwide. The age of occurrence, prognosis and incidence vary dr...