Protective Effect of Polyphenols, Protein, Peptides, and Polysaccharides on Alcoholic Liver Disease: A Review of Research Status and Molecular Mechanisms

Alcoholic liver disease (ALD) has emerged as an important public health problem in the world. The polyphenols, protein, peptides, and polysaccharides have attracted attention for prevention or treatment of ALD. Therefore, this paper reviews the pathogenesis of ALD, the relationship between polyphenols, peptides, polysaccharides, and ALD, and expounds the mechanism of gut microbiota on protecting ALD. It is mainly found that the hydroxyl group of polyphenols endows it with antioxidation to protect ALD. The ALD protection of bioactive peptides is related to amino acid composition. The ALD protection of polysaccharides is related to the primary structure. Meanwhile, polyphenols, protein, peptides, and polysaccharides prevent or treat ALD by antioxidation, anti-inflammatory, antiapoptosis, lipid metabolism, and gut microbiota regulation. This contribution provides updated information on polyphenols, protein, peptides, and polysaccharides in response to ALD, which will not only facilitate the development of novel bioactive components but also the future application of functional food raw materials will be promoted.

Alleviating Effect of Lacticaseibacillus rhamnosus 1.0320 Combined with Dihydromyricetin on Acute Alcohol Exposure-Induced Hepatic Impairment: Based on Short-Chain Fatty Acids and Adenosine 5'-Monophosphate-Activated Protein Kinase-Mediated Lipid Metabolism Signaling Pathway

Excessive drinking has been listed by the World Health Organization as the fifth major risk factor; especially the liver, as the core organ of alcohol metabolism, is prone to organic lesions. Probiotics have received attention due to their bioactivity for liver protection. The beneficial effects of probiotics on hosts are related to their physiological functions. Therefore, based on the concept of second-generation synbiotes, this study explored the protective effects of four dietary polyphenols on the stress tolerance, hydrophobicity, adhesion, and digestive characteristics of L. rhamnosus 1.0320. L. rhamnosus 1.0320 had the best synergistic effect with dihydromyricetin (DMY). Therefore, this combination was selected as a synbiotic supplement to explore the protective effect on acute alcohol exposure-induced hepatic impairment. The results showed that L. rhamnosus 1.0320 combined with DMY restored the intestinal barrier by upregulating short-chain fatty acid levels and activated the adenosine 5'-monophosphate-activated protein kinase-mediated lipid metabolism pathway to inhibit oxidative stress, inflammation, and lipid accumulation in the liver. Furthermore, 10⁹ CFU/mouse/d L. rhamnosus 1.0320 and 50 mg/kg/d DMY by gavage were identified as the optimal doses for protection against acute alcohol expose-induced hepatic impairment. This study provides new insights into alleviating acute alcoholic hepatic impairment by targeting intestinal metabolites through the gut-liver axis.

Non-perfectly Amphipathic α-Helical Structure Containing the XXYXX Sequence Improves the Biological Activity of Bovine αs2-Casein Antimicrobial Peptides

Non-amphiphilic WIQPKTKVIPYVRYL (WI-6) derived from bovine α_s2-casein f (193-207) was modified by a defined mutation method to obtain five engineered peptides with mirror symmetry structures. The five engineered peptide sequences were WF-1 (WFQVKTRVRTKVQFW), FW-2 (FWRRYKKVKKYRRWF), FW-3 (FWQVIKKVKKIVQWF), FK-4 (FKQFYRRVRRYFQKF), and FR-5 (FRQWYRRVRRYWQRF). However, FW-2, FW-3, FK-4, and FR-5 had obvious XXYXX sequences. Among these, FW-3 was demonstrated to have the highest antibacterial activity, which indicates that the non-perfectly amphipathic α-helical structure containing the XXYXX sequence has a better bactericidal effect. Therefore, peptide FW-3 could be widely used as a substitute for antibiotics in food, medicine, and other fields. These findings provide a potential method for designing novel antimicrobial peptides.

Study of the alleviation effects of a combination of Lactobacillus rhamnosus and inulin on mice with colitis

Ulcerative colitis (UC) is a common inflammatory bowel disease (IBD) that has serious harmful effects on human health. Lactobacillus rhamnosus, a probiotic, has a strong colonization and adhesion effect and improves the intestinal health of the host. Inulin has good anti-inflammatory effects and can promote the proliferation of beneficial intestinal bacteria. The purpose of this study was to investigate the alleviating effects of L. rhamnosus 1.0320 in combination with inulin on UC, examining the resulting changes in intestinal flora. A UC model was established by having mice freely drink a 3% (w/v) dextran sodium sulphate (DSS) solution for seven days. After successful modeling, the mice were given antibiotics, L. rhamnosus 1.0320 by itself, inulin by itself, and L. rhamnosus 1.0320 combined with inulin as an intragastric intervention for 28 days. The abundance and structural changes of bacteria in the intestinal content of mice were analyzed by 16S rDNA high-throughput sequencing. The study found that male BALB/c mice can successfully establish a typical model of small intestinal inflammation by freely drinking a 3% DSS solution for one week. L. rhamnosus 1.0320 combined with inulin can alleviate DSS-induced colitis, reduce the Disease Activity Index (DAI) score of the pathological damage of colon tissue, decrease myeloperoxidase (MPO) activity, increase hemoglobin content, and regulate the expression levels of inflammatory cytokines IL-1β, IL-6, TNF-α and IL-10. The intestinal flora of mice is reduced after enteritis, and its structure gets disordered. The combination of L. rhamnosus 1.0320 and inulin can increase the abundance and diversity of intestinal flora, and increase the content of beneficial bacteria. Prebiotics promote the colonization ability of probiotics. L. rhamnosus 1.0320 combined with inulin can change the intestinal flora to relieve ulcerative colitis, providing a new theoretical basis for the study of UC mechanism.

Molecular Characterization Of Pathogenic Salmonella Spp From Raw Beef In Karachi, Pakistan

The aim of the present study was to estimate the prevalence of Salmonella and investigate the dominant serovars distribution in raw beef and to screen the isolated serovars for the prescense of beta-lactamases and virulence genes. A total of 150 samples of raw beef sold at butcher shops (n = 75) and supermarkets (n = 75) in Karachi city were collected (50 samples each from muscles, lymph nodes, and minced beef). The samples were cultured according to the ISO-6579-1guidlines. The overall prevalence of Salmonella strains was found to be 21.34%. A total of 56 isolates of Salmonella belonging to four serogroups (Salmonella Pullorum, Salmonella Enteritidis, Salmonella Typhimurium and Salmonella Choleraesuis) were isolated from beef muscles (12%), lymph nodes (24%) and minced beef (28%) samples collected from butcher shops (av. 21.34%). No Salmonella was detected in beef samples collected from supermarkets. S. Enteritidis contamination was highest (37.5 %), followed by S. Choleraesuis (30.4%), S. Pullorum (19.6%) and S. Typhimurium (12.5 %). Antibiotic susceptibility testing revealed that Salmonella isolates were highly resistant to Oxytetracycline (90%), Ampicillin (90.5%), Amoxicillin (81.1%), Tetracycline (76%), Neomycin, (79.8%) and Ciprofloxacin (61.4%). The Salmonella isolates examined were more susceptible to the Cephalosporin antibiotics such as Cefixime (43.2%), Cefepime (48.2) and Cefoxitin (49.8%). PCR based screening of blaTEM, blaCTX-M and blaSHV revealed that blaCTX-M and blaTEM were the dominant resistant genes in S. Enteritidis and S. Typhimurium followed by S. Pullorum and S. Choleraesuis whereas blaSHV was the least detected beta-lactamase in Salmonella isolates. Virulence genes screening revealed that at least five genes were present in all the serovars, highest being present in S. Enteritidis (12/17) and S. Typhimurium (12/17). S. Cholerasuis (5/17) carried the least number of virulence genes followed by S. Pullorum (6/17). The present data suggest that beef samples from butcher shops of Karachi city are heavily contaminated with MDR Salmonella. The presence of resistance and virulence genes in MDR strains of Salmonella may play a significant role in transmission and development of Salmonella infection in humans.

Novel Angiotensin-Converting Enzyme-Inhibitory Peptides From Fermented Bovine Milk Started by Lactobacillus helveticus KLDS.31 and Lactobacillus casei KLDS.105: Purification, Identification, and Interaction Mechanisms

Fermented milks with strong angiotensin I-converting enzyme (ACE)-inhibitory activity were obtained through a culture with Lactobacillus helveticus KLDS.31 and Lactobacillus casei KLDS.105 with a fermentation and storage temperature of 37 °C. Ultrafiltration fractions with a molecular weight less than 3 kDa in fermented milk whey exhibited the strongest inhibitory activity. Correspondingly, a gastrointestinal digestion experiment showed retention of the bioactivity of these fractions with pepsin and trypsin treatment. Four ACE-inhibitory peptides from fermented milk were isolated, purified by two-step reverse chromatography, and sequenced. Furthermore, the interaction mechanisms between ACE and four isolated peptides were investigated by a molecular docking method and the Independent Gradient Model. Experimental determination of IC50 was done to verify theoretical results. The inhibitory peptide interacted with ACE as follows: Lys-Pro-Ala-Gly-Asp-Phe > Lys-Ala-Ala-Leu-Ser-Gly-Met > Lys-Lys-Ala-Ala-Met-Ala-Met > Leu-Asp-His-Val-Pro-Gly-Gly-Ala-Arg.

Characterization of the Bioactivity and Mechanism of Bactenecin Derivatives Against Food-Pathogens

With the emergence of multidrug-resistant bacteria, antimicrobial peptides (AMPs) are regarded as potential alternatives to traditional antibiotics or chemicals. We designed and synthesized six derivatives of bactenecin (L₂C₃V₁₀C₁₁, RLCRIVVIRVCR), including R₂F₃W₁₀L₁₁ (RRFRIVVIRWLR), R₂W₃W₁₀R₁₁ (RRWRIVVIRWRR), K₂W₃V₁₀R₁₁ (RKWRIVVIRVRR), W₂R₃V₁₀R₁₁ (RWRRIVVIRVRR), W₂K₃K₁₀R₁₁ (RWKRIVVIRKRR), and K₂R₃R₁₀K₁₁ (RKRRIVVIRRKR), by amino acid substitution to increase the net charge and reduce hydrophobicity gradually. The bioactivity and mechanisms of action of the designed peptides were investigated. The results indicated that the antimicrobial activity of the designed peptides was higher than that of bactenecin. The hemolytic activity and cytotoxicity of the designed peptides were significantly lower than those of bactenecin. The designed peptides exhibited a wide range of antimicrobial activity against food-pathogens, particularly peptides K₂W₃V₁₀R₁₁ and W₂R₃V₁₀R₁₁; in addition, the activity was maintained under physiological salt and heat conditions. Mechanism studies indicated that AMPs interacted with negatively charged bacterial cell membranes, resulting in the destruction of cell membrane integrity by increasing membrane permeability and changing transmembrane potential, leading to cell death. The present study suggested that peptides K₂W₃V₁₀R₁₁ and W₂R₃V₁₀R₁₁ exhibited potential as alternatives to traditional antibiotics or chemicals for the treatment of food-pathogens. These findings lead to the development of a potential method for the design of novel AMPs.

Predictors of Neurocognitive Impairment in Spanish-Speaking Latinos Living with HIV in the United States using Newly Developed Neuropsychological Test Norms

Objective

HIV-associated neurocognitive impairment (NCI) is prevalent and impactful. Yet, there is an absence of published studies that investigate its correlates among Spanish-speaking Latinos living in mainland US- a demographic that represents a large and vulnerable segment of the HIV+ population. The goal of the current study was to examine predictors of NCI among Spanish-speaking Latinos with HIV living in the United States.

Participants and Method

153 Spanish-speaking Latinos living with HIV from the US-Mexico border region (Age: M = 38.2, SD = 9.7; Education: M = 10.9, SD = 3.6; 73% female; 56% AIDS) completed comprehensive neuropsychological, neuromedical, and psychiatric evaluations in Spanish. Scores across 7 cognitive domains were converted to a Global Deficit Score (GDS) based on T-scores on individual tests using newly developed, region specific, and demographically-corrected norms for Spanish-speaking Latinos. NCI was determined using cutoff of GDS > 0.5 (39.2% of sample). Examined predictors included HIV disease characteristics (e.g., AIDS status, current CD4 count, duration of antiretroviral therapy (ART) exposure) and psychiatric comorbidities.

Results

A multivariable logistic regression - including predictors that were associated with NCI in univariable analyses - showed a significant interaction between lifetime history of substance use disorder (LT SUD) and duration of ART exposure, after accounting for AIDS status (LR Chi2 = 3.99, p = 0.046). Stratified analyses showed that among participants who did not have LT SUD, longer ART exposure was associated with decreased NCI (p = 0.01), while rates of NCI among those with LT SUD were not influenced by months of ART exposure (p = 0.91).

Conclusions

Present findings showed that HIV disease burden and psychiatric characteristics might interact to impact NCI among Spanish-speaking Latinos. Considering these influences may help in the provision of comprehensive care to Spanish-speaking, Latino minority groups that suffer from NCI and HIV.

End-of-life care following leg amputation in patients with peripheral artery disease or diabetes

Background

The aim was to characterize end-of-life care in patients who have had a leg amputated for peripheral artery disease (PAD) or diabetes.

Methods

This was a population-based retrospective cohort study of patients with PAD or diabetes who died in Ontario, Canada, between 2011 and 2017. Those who had a leg amputation within 3 years of death were compared with a control cohort of deceased patients with PAD or diabetes, but without leg amputation. The patients were identified from linked health records within the single-payer healthcare system. Place and cause of death, as well as health services and costs within 90 days of death, were compared between the amputee and control cohorts. Among amputees, multivariable regression models were used to characterize the association between receipt of home palliative care and in-hospital death, as well as time spent in hospital at the end of life.

Results

Compared with 213 300 controls, 3113 amputees were less likely to die at home (15·5 versus 24·9 per cent; P < 0·001) and spent a greater number of their last 90 days of life in hospital (median 19 versus 8 days; P < 0·001). Amputees also had higher end-of-life healthcare costs across all sectors. However, receipt of palliative care was less frequent among amputees than controls (inpatient: 13·4 versus 16·8 per cent, P < 0·001; home: 14·5 versus 23·8 per cent, P < 0·001). Among amputees, receipt of home palliative care was associated with a lower likelihood of in-hospital death (odds ratio 0·49, 95 per cent c.i. 0·40 to 0·60) and fewer days in hospital (rate ratio 0·84, 0·76 to 0·93).

Conclusion

Palliative care is underused after amputation in patients with PAD or diabetes, and could contribute to reducing in-hospital death and time spent in hospital at the end of life.

Neurocognitive Impairment in Spanish-Speaking Latinos Living with Human Immunodeficiency Virus in the United States: Validation of Neuropsychological Tests Norms

Objective

Latinos in the US are at increased risk for HIV-associated neurocognitive impairment (NCI). Yet, most studies in this group have included English-speakers only. We investigated the rate and pattern of HIV-associated NCI in Spanish-speaking Latinos from the US-Mexico border region by utilizing newly developed norms for this group, and compared it to previously published norms for English-speaking non-Latino Whites and Blacks/African Americans.

Participants and Method

Participants included 153 HIV+ Spanish-speaking Latinos (Age: M = 38.2, SD = 9.7; Education: M = 10.9, SD = 3.6; 27% female; 56% AIDS) living in the greater San Diego area. Participants completed comprehensive neuropsychological, neuromedical and psychiatric assessments in Spanish. The neuropsychological test battery employed in this study - and used extensively in prior studies of HIV- assesses seven ability domains. Raw test scores were converted to demographically-adjusted T-scores using regional norms for Spanish-speakers, and for non-Latino Whites and Blacks. NCI was defined per established criteria.

Results

Rate of global NCI was 39% using norms for Spanish-speaking Latinos, compared to 64% with White norms and 18% with Black norms. Using norms for Spanish speakers, domain specific NCI among those impaired was highest in executive function (68%), speed of information processing (65%), learning (51%), and working memory (50%). The pattern of HIV associated NCI varied when norms developed for non-Latino Whites and Blacks were used.

Conclusions

HIV+ Spanish speakers showed similar rates of global NCI to those in other HIV+ populations, when norms developed for this group were used. In contrast, use of non-Latino White and Black norms resulted in misclassification of impairment. The pattern of NCI differed based on the norms used. Present findings highlight the importance of utilizing norms developed for Spanish-speakers in the US in order to obtain more precise and valid depictions of cognition in this population.

Antibacterial Activity and Mechanism of Action of Bovine Lactoferricin Derivatives with Symmetrical Amino Acid Sequences

In recent years, the overuse of antibiotics has become very serious. Many pathogenic bacteria have become resistant to them, with serious potential health consequences. Thus, it is urgent that we develop new antibiotic drugs. Antimicrobial peptides (AMPs) are important endogenous antibacterial molecules that contribute to immunity. Most have spectral antibacterial properties and do not confer drug resistance. In this paper, an 11-residue peptide (LFcinB18⁻28) with a sequence of KCRRWQWRMKK was modified by amino acid substitution to form a symmetrical amino acid sequence. The antibacterial activities and mechanisms of action of engineered peptides including KW-WK (KWRRWQWRRWK), FP-PF (FPRRWQWRRPF), FW-WF (FWRRWQWRRWF), and KK-KK (KKRRWQWRRKK) were investigated. The four engineered peptides could more effectively inhibit bacteria than the original peptide, LFcinB18⁻28. This suggested that a symmetrical amino acid sequence might enhance the antibacterial activity of AMPs. However, only peptides KW-WK, FP-PF, and KK-KK were safe; FW-WF displayed hemolytic activity. The engineered peptides shared cationic and amphipathic characteristics that facilitated interactions with the anionic microbial membranes, leading to disruption of membrane integrity and permeabilizing microbial membranes, resulting in cell death. Therefore, a symmetrical amino acid sequence and related structural parameters offer an alternative approach to the design of AMPs. This will provide a scientific basis for the design and synthesis of new AMPs.

Broad-Spectrum Antimicrobial Activity and Low Cytotoxicity against Human Cells of a Peptide Derived from Bovine αS1-Casein

The primary objective of this study was to improve our understanding of the antimicrobial mechanism of protein-derived peptides and to provide evidence for protein-derived peptides as food bio-preservatives by examining the antimicrobial activities, low cytotoxicity, stabilities, and mechanism of Cp1 (LRLKKYKVPQL). In this study, the protein-derived peptide Cp1 was synthesized from bovine αS1-casein, and its potential use as a food biopreservative was indicated by the higher cell selectivity shown by 11-residue peptide towards bacterial cells than human RBCs. It also showed broad-spectrum antimicrobial activity, with minimum inhibitory concentrations (MICs) of 64⁻640 μM against both gram-positive and gram-negative bacteria. The peptide had low hemolytic activity (23.54%, 512 μM) as well as cytotoxicity. The results of fluorescence spectroscopy, flow cytometry, and electron microscopy experiments indicated that Cp1 exerted its activity by permeabilizing the microbial membrane and destroying cell membrane integrity. We found that Cp1 had broad-spectrum antimicrobial activity, low hemolytic activity, and cytotoxicity. The results also revealed that Cp1 could cause cell death by permeabilizing the cell membrane and disrupting membrane integrity. Overall, the findings presented in this study improve our understanding of the antimicrobial potency of Cp1 and provided evidence of the antimicrobial mechanisms of Cp1. The peptide Cp1 could have potential applications as a food biopreservative.

A Comparative study for the management of Peri-radicular Pathosis by Conventional Root Canal Therapy and Non Instrumental Endodontic Therapy

Non-surgical endodontics is one of the realities in modern endodontics globally which is a highly sophisticated specialized technical clinical procedure to conserve the teeth. Lesion Sterilized Tissue Repair (LSTR) is an alternative of conventional non-surgical endodontics (C-RCT) considered being a valuable adjunct to the treatment of infected root canal. This cross sectional prospective study was carried out in the department of Conservative Dentistry & Endodontics, Bangabandhu Sheikh Mujib Medical University (BSMMU), Dhaka, Bangladesh from January 2002 to January 2003. This study involved 100 cases of symptomatic endodontically involved teeth with peri radicular pathosis treated by non-surgical method (C-RCT) & (LSTR therapy) in multi-visit technique and immediate and long-term clinical and radiological follow-up done for 24 months. The result revealed complete disappearance of sinus tract 46(92%) in C-RCT and 35(70%) in LSTR therapy group and success in C-RCT was 88% and in LSTR therapy as 86% after 24 months follow-up by clinical and radiological evaluation. So, it can be concluded that non-surgical approach in the management of periradicular pathosis by C-RCT and LSTR therapy was found safe, effective and practical method of treatment of an endodontically involved tooth.

Unusual complication after insertion of deep brain stimulator electrode

Deep brain stimulation for movement disorders is becoming a commonly used procedure. In this article we describe a complication which has not been described previously. Post op intra-cranial air must be considered as a possible complication of DBS insertion and should be on the list of differentials if a patient presents with post operative neurological deficit.

Patient costs during tuberculosis treatment in Bangladesh and Tanzania: the potential of shorter regimens

OBJECTIVE

To estimate the costs incurred by patients during the intensive and continuation phases of the current 6-month tuberculosis (TB) regimen in Bangladesh and Tanzania, and thus identify potential benefits to patients of a shorter, 4-month treatment regimen.

DESIGN

The validated Stop TB patient cost questionnaire was adapted and used in interviews with 190 patients in the continuation phase of treatment with current regimens.

RESULTS

In both countries, overall patient costs were lower during 2 months of the continuation phase (US$74 in Tanzania and US$56 in Bangladesh) than during the 2 months of the intensive phase of treatment (US$150 and US$111, respectively). However, continuation phase patient costs still represented 89% and 77% of the 2-month average national income in the respective countries. Direct travel costs in some settings were kept low by local delivery system features such as community treatment observation. Lost productivity and costs for supplementary foods remained significant.

CONCLUSIONS

Although it is not a straightforward exercise to determine the exact magnitude of likely savings, a shorter regimen would reduce out-of-pocket expenses incurred by patients in the most recent 2 months of the continuation phase and allow an earlier return to productive activities.

Uterus didelphys with unilateral obstructed hemivagina and haematocolpos with ipsilateral renal agenesis - a case report

Mullerian anomalies are a relatively uncommon occurrence with implication for adolescents and adults as they may result in specific gynaecologic, fertility and obstetrical issues. Uterus didelphys with blind hemivagina and ipsilateral renal agenesis is a rare congenital anomaly. Patient may be asymptomatic and unaware of having double uterus or may present with severe dysmenorrhoea or dyspareunia or a palpable mass due to unilateral haematocolpos. We report a case of 12 year old girl with this condition who was diagnosed as uterus didelphys with unilateral haematocolpos with ipsilateral renal agenesis on the basis of clinical association, physical examination and sonography and intravenous urogram.

Carbon nanotube-reinforced hydroxyapatite composite and their interaction with human osteoblast in vitro

As a bone mineral component, hydroxyapatite (HA) has been an attractive bioceramic for the reconstruction of hard tissues. However, its poor mechanical properties, including low fracture toughness and tensile strength, have been a substantial challenge to the application of HA for the replacement of load-bearing and/or large bone defects. In this study, HA is reinforced with high-purity and well-functionalized multiwalled carbon nanotubes (MWCNTs; >99 wt%) having an average diameter of 15 nm and length from 10 to 20 μm. The cellular response of these functionalized CNTs and its composites were examined in human osteoblast sarcoma cell lines. Calcium nitrate tetrahydrate (Ca(NO3)2·4H2O) and diammonium hydrogen phosphate ((NH4)2HPO4) were used to synthesize HA in situ. MWCNTs were functionalized by heating at 100°C in 3:1 ratio of sulfuric acid and nitric acid for 60 min with stirring and dispersed in sodium dodecyl benzene sulfonate by sonication. HA particles were produced in MWCNTs solution by adding Ca(NO3)2·4H2O and (NH4)2HPO4 under vigorously stirring conditions. The composite was dried and washed in distilled water followed by heat treatment at 250°C to obtain CNT-HA powder. Physiochemical characterization of the composite material was carried out using Fourier transform infrared spectroscopy, field-emission scanning electron microscopy, energy-dispersive X-ray spectrometer, and X-ray diffractometer. Furthermore, this study investigates the cytotoxic effects of functionalized-MWCNTs (f-MWCNTs) and its composites with HA in human osteoblast sarcoma cell lines. Human osteoblast cells were exposed with different concentrations of f-MWCNTs and its composite with HA. The interactions of f-MWCNT and MWCNT-HA composites were analyzed by 3-(4,5–dimethyl thiazol-2-yl)-2,5-diphenyl tetrazolium bromide assay. The results indicate no detrimental effect on survival or mitochondrial activity of the osteoblast cells. Cell viability decreased with an increase in CNT concentration indicating that MWCNTs and its composite can be cytotoxic at higher dosages. This result provides further evidence that the bionano interface can be developed for CNT-reinforced HA composites for load-bearing bone implants, drug delivery, and tissue engineering.

An open randomized controlled trial to compare the efficacy of two fixed dose combinations of artemesinin based combinations for uncomplicated falciparum malaria in Bangladesh

National Malaria Control Program (NMCP) of Bangladesh has introduced Artemisinin Based Combination (ACT), Coartem(R) (Artemether-Lumefantrine (AL), fixed dose combination, in the confirmed cases of uncomplicated P. falciparum malaria since 2004. Despite the reduction of mortality due to malaria, the development and spread of anti-malarial drug resistance wordwide posing a threat to the health services and will make it difficult to control malaria in Bangladesh in future. We need to have an alternative to Coartem which could be Artesunate-amodiaquine (AA) in a fixed dose combination (FDC), a cheaper altenative not yet evidenced to be effective and safe to our population. In this study we compared the efficacy and safety of Artemether + Lumefantrene (FDC, Coartem®) with Artesunate +Amodiaquine tablets (100/270 mg FDC) for the treatment of uncomplicated P. falciparum malaria in three high risk multi-drug resistant malaria prevalent areas of Bangladesh. It was an open label randomized controlled trial conducted between December 2008 and November 2009 in 4 upazillas in patients over the age 12 to 60 years diagnosed as a case of uncomplicated P.falciparum malaria. The outcome of the cases were measured as clinical response, parasitological response, defervescence time and parasite clearance time. Drug safety was assessed by comparing the adverse events. A total of 252 cases were randomized to receive Artesunate + Amodiaquine (AA group, 147 cases) and Artemether + Lumefantrene (AL group, 106 cases), one lost to follow up at day 28 in AA group. The distribution of the cases was comparable by age, sex and study sites. Treatment success’ response was observed 100% in the AL group and AA group had 99%, two failures with AA were late treatment failures and the difference was not statistically significant (p>.1). The parasitological sensitive (S) response was observed in 97% of cases in AL group and 95% in the AA group, and was not a statistically significant difference. There was no significant difference in deffervescence time and parasite clearance time between two groups of cases. No serious adverse events were observed. The frequencies of minor adverse events were insignificantly different between the two treatment groups. The two ACT regimen, AA and AL had no significant difference in efficacy and safety for treatment of Uncomplicated Malaria in Bangladesh. However, there were few more failures with AA regimen compared to AL regimen, which was not statistically significant. Both these regimens can be used alternatively by the NMCP of Bangladesh as first-line treatment option. DOI: http://dx.doi.org/10.3329/bmrcb.v39i3.20310 Bangladesh Med Res Counc Bull 2013; 39: 109-115

Fasting serum glucose and glycosylated hemoglobin level in obesity

Obesity is a condition in which the body fat stores are increased to an extent which impairs health and leads to serious health consequences. The amount of body fat is difficult to measure directly, and is usually determined from an indirect measure - the body mass index (BMI). Increased BMI in obese persons is directly associated with an increase in metabolic disease, such as type 2 diabetes mellitus. This Analytical cross sectional study was undertaken to assess the relation between obesity and glycemic control of body by measuring fasting serum glucose and glycosylated hemoglobin. This study was carried out in the Department of Physiology, Mymensingh Medical College, Mymensingh from 1st July 2011 to 30th June 2012 on 120 equally divided male and female persons within the age range of 25 to 55 years. Age more than 55 years and less than 25 years and diagnosed case of Hypothyroidism, Cushing's syndrome, polycystic ovary, Antipsychotic drug user and regular steroid users were excluded. Non probability purposive type of sampling technique was used for selecting the study subjects. Measurement of body mass index was done as per procedure. Fasting serum glucose was estimated by glucose oxidase method and Glycosylated hemoglobin by Boronate Affinity method. Statistical analysis was done by SPSS (version 17.0). Data were expressed as Mean±SE and statistical significance of difference among the groups were calculated by unpaired student's 't' test and Pearson's correlation coefficient tests were done as applicable. The Mean±SE of fasting serum glucose was significant at 1% level (P value <0.001) for obese group of BMI. There was no significant difference of glycosylated hemoglobin level between control and study groups. But there was positive correlation within each group. Fasting serum glucose also showed a bit stronger positive correlation with BMI. Both obese male and female persons showed higher levels of fasting serum glucose and glycosylated hemoglobin. The observed positive correlation between BMI with fasting serum glucose and glycosylated hemoglobin emphasizes the importance of maintenance of normal BMI to prevent early onset of type 2 diabetes mellitus.

Intensity of parasitic infestation in silver carp, Hypophthalmichthys molitrix

Silver carp, Hypopthalmichthys molitrix is one of the most economically valuable fish species in Bangladesh. However, its production is often hindered by parasite-induced mortality. The present study reports the intensity of parasitic infestation in 216 specimens of H. molitrix collected from different fish markets in Rajshahi City, Bangladesh. Nine different parasite species (Trichodina pediculatus, Dactylogyrus vastator, Ichthyophthirius multifilis, Gyrodactylus elegans, Lernaea sp., Apiosoma sp., Myxobolus rohitae, Camallanus ophiocephali, and Pallisentis ophiocephali) were recovered from the gill, skin, stomach, and intestine of host fish. The highest level of infection was observed for host skin, while lower levels were observed for host gill, stomach, and intestine. The results also revealed that the intensity of parasite infection in different organs of H. molitrix varied with the season. In particular, the highest levels of infection were recorded during the winter period (November-February), when fish are most susceptible to parasites. The findings of the study will help in the management and conservation of H. molitrix.

Preliminary studies on the hypoglycaemic effect ofAbroma augusta in alloxan diabetic rats

The hypoglycemic effect of the aqueous extract ofAbroma augusta (Family: Steculiceae) was studied in normal as well as alloxan diabetic rats. Treatement of diabetic rats with 4 ml (4gm dry weight) of agueous extract ofA. augusta for 16 weeks resulted in gradual but significant fall in fasting blood glucose and improvement in glucose tolerance. Serum total and LDL cholesterol and triacylglycerol which increased in diabetic rats showed improvement. These results show that the water extract ofA. augusta has both hypoglycemic and hypocholesterolemic effects.

Prkar1a in the regulation of insulin secretion

The incidence of type 2 diabetes mellitus (T2DM) is rapidly increasing worldwide with significant consequences on individual quality of life as well as economic burden on states' healthcare costs. While origins of the pathogenesis of T2DM are poorly understood, an early defect in glucose-stimulated insulin secretion (GSIS) from pancreatic β-cells is considered a hallmark of T2DM. Upon a glucose stimulus, insulin is secreted in a biphasic manner with an early first-phase burst of insulin, which is followed by a second, more sustained phase of insulin output. First phase insulin secretion is diminished early in T2DM as well is in subjects who are at risk of developing T2DM. An effective treatment of T2DM with incretin hormone glucagon-like peptide-1 (GLP-1) or its long acting peptide analogue exendin-4 (E4), restores first-phase and augments second-phase glucose stimulated insulin secretion. This effect of incretin action occurs within minutes of GLP-1/E4 infusion in T2DM humans. An additional important consideration is that incretin hormones augment GSIS only above a certain glucose threshold, which is slightly above the normal glucose range. This ensures that incretin hormones stimulate GSIS only when glucose levels are high, while they are ineffective when insulin levels are below a certain threshold. Activation of the GLP-1 receptor, which is highly expressed on pancreatic β-cells, stimulates 2 -distinct intracellular signaling pathways: a) the cAMP-protein kinase A branch and b) the cAMP-EPAC2 (EPAC=exchange protein activated by cAMP) branch. While the EPAC2 branch is considered to mediate GLP-1 effects on first-phase GSIS, the PKA branch is necessary for the former branch to be active. However, how these 2 branches interplay and converge and how their effects on insulin secretion and insulin vesicle exocytosis are coordinated is poorly understood.Thus, at the outset of our studies we have a poorly understood intracellular interplay of cAMP-dependent signaling pathways, which - when stimulated - restore glucose-dependent first phase and augment second phase insulin secretion in the ailing β-cells of T2DM.

Comparative study between combination of famciclovir and prednisolone with prednisolone alone in acute Bell's palsy

The antiviral drug acyclovir or its analogue, valacyclovir, has been applied in various trials on Bell's palsy with inconsistent results. We compared the therapeutic effect of famciclovir plus prednisolone with prednisolone alone, in patients with Bell's palsy. In a randomized, prospective trial, 68 patients were randomized to treatment with famciclovir and prednisolone (34 patients) or prednisolone alone (34 patients). All patients underwent supportive therapy. Severity of Bell's palsy was evaluated using the House-Brackmann scale (HBS). Follow-up was done after 1 week, 1 month and 3 months, with complete recovery defined as House-Brackmann grade I. The analysis revealed that recovery rates at month 1 and 3 were significantly higher in combination group than that of prednisolone only group (94.1% vs. 61.8% and 97.1% vs. 74.5% respectively). Again recovery from mild to moderate (HBS-II, III, IV) Bell's palsy occurred completely at month 3 and that of severe (HBS-V, VI) Bell's palsy was two-third of the patients. Again in severe Bell's palsy combination treatment increased the chance of complete recovery more than 10-fold than that of steroid only. The study results suggest that better outcome for Bell's palsy patients occurred if they were treated with prednisolone and famciclovir combination instead of prednisolone alone. In fact a considerable number of patients were benefited from additional antiviral therapy with famciclovir.

Outcome of tympanoplasty with and without cortical mastoidectomy for tubotympanic chronic otitis media

This cross sectional study was done to find out the level of hearing improvement in Type-I tympanoplasty with cortical mastoidectomy in tubotympanic chronic otitis media. Data were analyzed from 60 patients with audiometric studies with a minimum of 6 months follow up. Patients who under went tympanoplasty alone were kept in Group I, and who under went tympanoplasty with cortical mastoidectomy were kept in Group II. All patients prior to tympanoplasty were examined thoroughly after taking detailed history. On otoscopy, site and size of the tympanic membrane perforation, condition of the rest of the tympanic membrane, condition of the middle ear mucosa and the ossicles were noted. Tuning fork test, test for facial nerve integrity and fistulae test were performed. Hearing level was assessed by pure tone audiometry with masking. X-ray mastoid and X-ray paranasal sinuses were done to exclude local pathology. Surgical approaches were mostly post-auricular and in few cases it was per-meatal in Group I patient. Audiometric evaluation performed according to the International Organization for Standardization (ISO) standard. Hearing threshold measured at 250, 500, 1000, and 2000 Hz. Hearing improvement was assessed by closure of the air bone gap. Mean closure of air bone gap in Group I was 9.38 dB and in Group II it was 20.61 dB which was statistically significant (p<0.001). Improvement of hearing level was more in patient who underwent tympanoplasty with cortical mastoidectomy than those patients on whom only tympanoplasty was performed. Hearing gain is more in Type-1 tympanoplasty combining with Cortical Mastoidectomy than in Type-1 tympanoplasty alone in the patient's of tubotympanic otitis media.

Treatment seeking in reproductive age women with RTIs/STIs: a community based cross-sectional study

The socio-cultural and economic contexts in developing countries influence the epidemiology or STIs and helps in making them an important public health priority. This study was carried out to explore the health care seeking pathway of the women suffering from RTls/STls. influence or major socio-demographic variables on treatment seeking pattern. This cross sectional study was carried out comprising or eight hundred reproductive age (15-49 years) women selected following a multistage sampling procedure. The information pertaining to health seeking behaviour were collected from them using a pre-designed pretested interview schedule. Quantum of RTIs/STIs in the study group was estimated and symptomatics were asked specially about time lag between appearance of symptoms and seeking acre; reason for not seeking care; outcome of treatment they have taken if any. Out of total 359 subjects with symptoms of RTls/STls only about one-third (37.3%) had sought treatment. Only a few (4.5%) had sought treatment within 1 month of appearance of symptoms. Considering it to be physiological about half of the subjects (45.3%) did not seek treatment. The treatment seeking pattern was highly associated with the level of education (p = 0.000). Reluctance in seeking treatment, delay in its initiation, prelerence for unqualified practitioners in first consultation and significant association between education and treatment seeking pattern emphasize BCC and service provision for control and prevention of RTls/STls.

Status of HIV infection among the pregnant women attending in outpatient department

Human immunodeficiency virus (HIV) infection has been spreading rapidly in the developing countries and vertical transmission also taking place. This study has been done to find out the prevalence of HIV infection among the pregnant women, so that necessity of routine screening test can be identified. It is a cross sectional study. Five hundred two pregnant women were included. Three ml venous blood was taken and then HIV screening test was done by ELISA method. All reactive tests were confirmed by Western blot antibody testing. The positive cases were followed up and necessary treatment was given. Delivery was conducted in this hospital. Baby's blood was tested to see vertical transmission after 18 months. Most of the subject were educated housewife, mean age was 25 years. Six (6%) husband was overseas service holder, 12% were smoker and 1.6% had drug addiction. Eight (8%) subject had previous history of blood transfusion and 49% subject or her husband had history of surgery or got parental therapy. 2% subject gave the history of familial disharmony and 2% had multiple sex partners. HIV infection was found in 2 patients (0.4%). Both of them got infection from their husband. One husband was over seas service holder and another one was injecting drug user. For the prevention of spread, reduction of vertical transmission and providing early management to the positive patient all pregnant women should be screened for HIV routinely.

Maternal complications in twin pregnancies

Twin pregnancy is a high-risk pregnancy as it is associated with significant increase in the perinatal mortality and morbidity and maternal mortality and morbidity. This study was carried out to determine the maternal complications related with twin pregnancy. This was a cross-sectional observational study among all women with twin pregnancy, both booked (patients who had at least three visits to antenatal care were considered as booked) and unbooked, admitted in Institute of Post Graduate Medicine and Research, Dhaka now Bangabandhu Sheikh Mujib Medical University. Out of 3675 deliveries 53(1.4%) patients had twin pregnancy during a period of two years beginning from September 1996 to August 1998. Out of 53 patients, 34(64.2%) were multipara and 19(35.8%) were primipara. Most of the patients were between 22-29(67.9%) years group. The duration of gestations was 32-36 weeks for 17(32.1%) patients, 37-40 weeks for 30(56.6%) patients. Maternal complications were noticed as anaemia in 19(35.8%) patients, hypertension in 12(22.6%) patients, post-partum haemorrhage (PPH) in 10(18.9%) patients, hyperemesis gravidarum in 4(7.5%), polyhydramnios in 3(5.7%) patients, ante-partum haemorrhage (APH) in 3(5.7%) patients, premature rupture of membranes (PROM) in 2(3.8%) patients, gestational diabetes in 3(5.7%) patients, urinary tract infection (UTI) in 2(3.8%) patients, complications of operative delivery in 2(3.8%) patients. There was no maternal death in our study. Twin Pregnancy is a high-risk pregnancy associated with significant increase in maternal mortality and morbidity. With aggressive management of complications such as preterm labour, foetal distress, hypertension, APH, PPH, premature rupture of membranes etc morbidity and mortality can be improved.

Metastasis in differentiated thyroid carcinoma

Seventy patients of differentiated thyroid carcinoma (DTC) irrespective of age and sex were selected in ENT Department of Bangabandhu Sheikh Mujib Medical University, Dhaka Medical College Hospital and Rangpur Medical College Hospital who were admitted from March 2003 to March 2005. Female were more commonly affected (2.6:1) Papillary carcinoma was more common in 31-50 years of age and follicular carcinoma (ca) common in 41-50 years of age. Among the differentiated thyroid carcinoma papillary carcinoma found 77.15% and follicular ca. found 22.85%. Lymph node metastasis was more common in papillary (35%) than follicular carcinoma (12.5%). But distant metastasis was more common in follicular (12.5%) than papillary carcinoma (3.70). Maximum lymph node metastasis was found in level 3(55%), level 2(45%).

Neck swelling with renal stone

Since the advent of screening of calcium and imaging techniques (CT and MRI), hyperparathyroidism has been detected with increasing frequency. Although in the past, most patients present with severe bone and renal diseases, a large number of patients are asymptomatic. Number of parathyroid glands and their ectopic locations in individuals are the problem of its management. Parathyroid adenoma or hyperplasia may be a part of Multiple Endocrine neoplasia type II. This is the story of a boy of 18 years who had got admitted in the department of Otolaryngology, Mymensingh Medical College Hospital with the complaints of a neck swelling, abdominal discomfort, inability to walk, frequency of micturation for almost same duration of 1 year. After search, hypercalcaemia, bilateral renal stone, raised parathormone level and enlarged one parathyroid gland in lower pole of left thyroid lobe was identified. Clinically it was diagnosed as parathyroid adenoma which was proved histologically after surgical excision. Many controversies still exist regarding the treatment policy of parathyroid adenoma.

Fault diagnosis of the polypropylene production process (UNIPOL PP) using ANFIS

The performance of a chemical process plant can gradually degrade due to deterioration of the process equipment and unpermitted deviation of the characteristic variables of the system. Hence, advanced supervision is required for early detection, isolation and correction of abnormal conditions. This work presents the use of an adaptive neuro-fuzzy inference system (ANFIS) for online fault diagnosis of a gas-phase polypropylene production process with emphasis on fast and accurate diagnosis, multiple fault identification and adaptability. The most influential inputs are selected from the raw measured data sets and fed to multiple ANFIS classifiers to identify faults occurring in the process, eliminating the requirement of a detailed process model. Simulation results illustrated that the proposed method effectively diagnosed different fault types and severities, and that it has a better performance compared to a conventional multivariate statistical approach based on principal component analysis (PCA). The proposed method is shown to be simple to apply, robust to measurement noise and able to rapidly discriminate between multiple faults occurring simultaneously. This method is applicable for plant-wide monitoring and can serve as an early warning system to identify process upsets that could threaten the process operation ahead of time.

Angiogenesis-a novel therapeutic approach for ischemic heart disease

Angiogenesis is the biologic process of forming new blood vessels. Undoubtedly, blood vessels growth regulation is a vital aspect in health and disease. Under physiological conditions, angiogenesis is regulated by local balance between endogenous stimulators and inhibitors of this process. In many diseases state body loses control over angiogenesis. Angiogenesis-dependent diseases result when new blood vessels either grow excessively or insufficiently. Insufficient angiogenesis occurs in diseases such as coronary artery disease, stroke and chronic wounds. Myocardial ischemia both acute and chronic has been clearly shown to stimulate angiogenesis in many experimental models. Therapeutic angiogenesis is the biological agents or bioactive material to stimulate the growth of new blood vessels. Traditional coronary revascularization therapies such as coronary angioplasty or bypass graft surgery, act by restoring blood flow through the preexisting coronary vessels. One limitation of these approaches, however, may be the failure to normalize myocardial perfusion, due to the concomitant presence or small of resistance vessel disease. In contrast, therapeutic angiogenesis is based on the concept that coronary collateral development may be stimulated by pharmacological or molecular means and can limit myocardial ischemia. Studies, both in human and animal models support the notion that, various angiogenic growth factors and progenitor cells can enhance new blood vessels. Vascular endothelial growth factor (VEGF), fibroblast growth factor (FGF), recombinant proteins and bone marrow stem cells are currently used therapeutic stimulators for angiogenesis. As coronary artery disease is the major cause of death in the developed societies and also an emerging health problem in developing countries like Bangladesh therapeutic angiogenesis may provide hope as a new treatment modality for ischemic heart disease with or in place of current therapies.

Drug abuse and addiction

Among the social and medical ills of the twentieth century, substance abuse ranks as on one of the most devastating and costly. The drug problem today is a major global concern including Bangladesh. Almost all addictive drugs over stimulate the reward system of the brain, flooding it with the neurotransmitter dopamine. That produces euphoria and that heightened pleasure can be so compelling that the brain wants that feeling back again and again. However repetitive exposure induces widespread adaptive changes in the brain. As a consequence drug use may become compulsive. An estimated 4.7% of the global population aged 15 to 64 or 184 million people, consume illicit drug annually. Heroin use alone is responsible for the epidemic number of new cases of HIV/AIDS, Hepatitis and drug addicted infant born each year. Department of narcotic control (DNC) in Bangladesh reported in June 2008 that about 5 million drug addicts in the country & addicts spend at least 17 (Seventeen) billion on drugs per year. Among these drug addicts, 91% are young and adolescents population. Heroin is the most widely abused drugs in Bangladesh. For geographical reason like India, Pakistan and Myanmar; Bangladesh is also an important transit root for internationally trafficking of illicit drug. Drug abuse is responsible for decreased job productivity and attendance increased health care costs, and escalations of domestic violence and violent crimes. Drug addiction is a preventable disease. Through scientific advances we now know much more about how exactly drugs work in the brain, and we also know that drug addiction can be successfully treated to help people stop abusing drugs and resume their productive lives. Most countries have legislation designed to criminalize some drugs. To decrease the prevalence of this problem in our setting; increase awareness, promoting additional research on abused and addictive drugs, and exact implementation of existing laws are strongly recommended. We should also deserve renewed attention on prescription drug abuse. It is imperative that as a nation we make ourselves aware of the consequences associated with drug abuse. Otherwise devastating effects of drug will destroy the manpower and economic growth of the country.

Epidemic of cutaneous leishmaniasis: 109 cases in a population of 500

In February 2004, 4 patients aged 10-15 years presented at the Pakistan Institute of Medical Sciences with non-healing multiple ulcers on exposed parts. On the basis of history, clinical assessment and fine needle aspiration cytology, they were diagnosed as having cutaneous leishmaniasis. We were informed that several similar cases were present in their village. A team of doctors and technicians visited the area. A survey was conducted and another 105 cases with various morphological presentations were identified. The area was visited several times to find the vector, reservoirs and source of infection and to advise on controlling the epidemic.

Investigation of human pharmacoscintigraphic behavior of two tablets and a capsule formulation of a high dose, poorly water soluble/highly permeable drug (efavirenz)

Human pharmacoscintigraphic behavior of two tablets and a capsule formulation of a high dose, poorly water soluble, highly permeable, micronized drug (efavirenz) was investigated. The tablets and capsule, prepared with samarium oxide and neutron activated to produce radioactive samarium-153, were evaluated for their in vivo disintegration and gastrointestinal (GI) transit in healthy subjects under fasted condition. Scintigraphic images were acquired to coincide with blood sampling times to assess the plasma concentration-time profile in relation to in vivo disintegration and GI transit. The mean gastric emptying times were approximately the same for all three formulations. Although in vivo dosage form disintegration was faster for Tablet A as compared to Tablet B and was similar between Tablet A and the capsule, Tablet A showed a slower rate and extent of drug absorption than Tablet B and the capsule. The results of this study eliminated the initial hypothesis that the difference in in vivo performance between the two tablet formulations is due to a different rate of in vivo disintegration and suggest that for this drug the in vivo dissolution rate of the drug from its disintegrated dosage form was a more important factor affecting the rate and extent of drug absorption.

Serum HDL-cholesterol in women using low dose oral contraceptives

This study was done to appraise the effects of low-dose oral contraceptives (OCs) containing 30microgm ethinyl estradiol and 150microgm levonorgestrel on lipid metabolism by a lipid variable-serum HDL-cholesterol (HDL-C). HDL-C has been identified as a lipoprotein that protects against atherosclerosis and its levels are inversely proportional to the risk for developing ischemic coronary disease and venous thromboembolic disorders. Ninety young women within reproductive age group were picked for this study. Sixty women using low-dose oral contraceptives served as experimental group and thirty age matched hormonal contraceptive non users were selected for control group. Experimental group was again subdivided into OCs users for last one-year group, three-year group and five-year group. The result showed that there was no significant difference on serum HDL-cholesterol levels between users & non-users women. It is concluded that low-dose oral contraceptives regimens did not significantly affect the lipid metabolism. It can be safely used as contraceptive & non-contraceptive purposes. The value of studied parameter for serial longer duration of OCs uses needs to be assessed.

An in vitro microleakage study of different filling materials using dye penetration method

In the present study, the marginal integrity of different filling materials was evaluated in invitro. Furthermore, the effect of manipulation technique on their microleakage was also investigated. A total of sixty standard prepared class V cavities were filled with glass ionomer cement (both auto-cured and light-cured), light cured packable variety composite resin pretreated with echant and bonding agent and dental amalgam (both mechanically and conventional hand mixed) with or without pretreatment by cavity varnish. Cavities were then subjected to microleakage test following thermocycling. Statistical analysis was performed by One way ANOVA and Sheffe's multiple comparison tests. The results showed that mechanically mixed Silver Amalgam pretreated with cavity varnish showed the least microleakage, whereas, autocured glass ionomer showed highest marginal leakage. Light-cured packable composite was superior in resisting microleakage than both types of glass ionomer but was inferior to dental amalgam in the same respect. From this study, it can be concluded that composite resin can be used to fill class V cavities for esthetic reason but their properties should be improved.

Prevalence study to elucidate the transmission pathways of Helicobacter pylori at oral and gastroduodenal sites of a South Indian population

INTRODUCTION

Since the discovery of Helicobacter pylori (H. pylori), much progress has been made worldwide in the field of its epidemiology. In spite of these advancements, many aspects of epidemiology still remain unclear, particularly among populations with low socio-economic status. The present study was designed to elucidate the different routes of transmission of H. pylori in the Hyderabad (South India) population and to investigate the impact of certain factors, such as age, gender, and lifestyle.

METHODS

Samples used for the study included saliva and biopsy samples of 400 symptomatic subjects from Hyderabad, India. The patients were retrospectively grouped, based on histopathology of the biopsy and 16S rRNA amplification of both saliva and biopsy as H. pylori positive and negative.

RESULTS

This study showed that the prevalence of H. pylori in both saliva and biopsy samples increased with age. In addition, the H. pylori infection was found more commonly in the saliva and biopsy samples among males (64 percent and 60 percent, respectively) than females (53.3 percent and 64 percent, respectively). Similarly, 71.6 percent and 73.5 percent of those who consumed municipal water acquired H. pylori (which were respectively found in their saliva and biopsy samples) compared to a lesser proportion (12.6 percent and 12.6 percent, respectively) of those who consumed boiled or filtered water. The study also found that subjects who preferred home-cooked food (57.1 percent and 57.7 percent) showed a lower prevalence of H. pylori in saliva and biopsy samples, respectively, compared to those (80 percent and 88 percent) who frequently ate out.

CONCLUSION

The results of the present study suggest that besides the oral-oral route, the transmission of H. pylori also takes place through the consumption of food prepared under unhygienic conditions. Consumption of municipal tap water also has a high impact in the transmission of H. pylori.

The study of neural network-based controller for controlling dissolved oxygen concentration in a sequencing batch reactor

The design and development of the neural network (NN)-based controller performance for the activated sludge process in sequencing batch reactor (SBR) is presented in this paper. Here we give a comparative study of various neural network (NN)-based controllers such as the direct inverse control, internal model control (IMC) and hybrid NN control strategies to maintain the dissolved oxygen (DO) level of an activated sludge system by manipulating the air flow rate. The NN inverse model-based controller with the model-based scheme represents the controller, which relies solely upon the simple NN inverse model. In the IMC, both the forward and inverse models are used directly as elements within the feedback loop. The hybrid NN control consists of a basic NN controller in parallel with a proportional integral (PI) controller. Various simulation tests involving multiple set-point changes, disturbances rejection and noise effects were performed to review the performances of these various controllers. From the results it can be seen that hybrid controller gives the best results in tracking set-point changes under disturbances and noise effects.

Rapid diagnosis of Helicobacter pylori infection in dyspeptic patients using salivary secretion: a non-invasive approach

INTRODUCTION

Current guidelines that recommend Helicobacter pylori eradication treatment without endoscopy in selected patients underscore the importance of non-invasive testing. The accuracy of saliva as a non-invasive specimen was compared with that of invasive tests in pretreatment diagnosis of H. pylori infection.

METHODS

One hundred patients undergoing gastroscopy were grouped into 80 symptomatic and 20 asymptomatic subjects and were investigated for the presence of H. pylori in saliva and stomach. Samples tested comprised saliva and gastric biopsies collected from each patient. Exclusion criteria were history of peptic ulcer, bleeding ulcer, cancer or recent use of antibiotics, proton pump inhibitors and non-steroidal anti-inflammatory drugs. Two sets of primers homologous to 534 bp fragment of H. pylori DNA, which have been shown previously to be highly specific and sensitive, were used for the polymerase chain reaction (PCR) amplification.

RESULTS

72 (90 percent) of the symptomatic group and 10 asymptomatic subjects were infected with H. pylori in the stomach as determined by histology and direct PCR amplification of biopsy DNA obtained from each subject. H. pylori DNA was identified in the saliva of 70 (87.5 percent) symptomatic subjects and 12 (60 percent) asymptomatic control subjects.

CONCLUSION

High rates of detection using saliva as a specimen indicate that saliva of the infected person could serve as a reliable non-invasive alternative to detect the presence of H. pylori infection in comparison to the currently available standard diagnostic tests.