207 research outputs found

    BIOSORPTION AND RECOVERY OF HEAVY METALS FROM AQUEOUS SOLUTIONS BY EICHHORNIA CRASSIPES (WATER HYACINTH) ASH

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    Heavy metal’s release without treatment poses a significant threat to the environment. Heavy metals are non-biodegradable and persistent. In the present study the ash of water hyacinth (Eichhornia crassipes), was used to remove six metals from aqueous solutions through biosorption. Results of batch and column experiments showed excellent adsorption capacity. Removal of lead, chromium, zinc, cadmium, copper, and nickel was 29.83, 1.263, 1.575, 3.323, 2.984 and 1.978 µgg-1, respectively. The biosorptive capacity was maximum with pH >8.00. Desorption in µgg-1 of ash for lead, chromium, zinc, cadmium, copper, and nickel was 18.10, 9.99, 11.99, 27.54, 21.09, and 3.71 respectively. Adsorption/desorption of these metals from ash showed the potential of this technology for recovery of metals for further usages. Hydrogen adsorption was also studied with a Sievert-type apparatus. Hydrogen adsorption experiments showed significant storage capacity of water hyacinth ash

    Utilization of RSM for optimization of physical variables to improve bacteriocin production from Lactobacillus plantarum strain MS

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    The utilization of natural antimicrobial substances has been increased in the pharmaceutical sector due to their stability and inhibition activity against pathogenic microorganisms. In the current study, the bacteriocin synthesis by locally isolated Lactobacillus plantarum MS from yogurt, has been optimized by using response surface methodology. Statistical optimization of physical variables by using Box-Behnken design, 3200 AU/mL bacteriocin activity was detected at 30 °C temperature, 18h incubation time and pH 6 against Staphylococcus aureus. The resulting bacteriocin was found to be stable a broad range of pH (2-12) and temperature (37-100 °C) but the activity of bacteriocin was slightly disturbed at 121 °C. Besides, bacteriocin showed stability after treatment with various enzymes (catalase, amylase, and lipase), salt (NaCl), and surfactants (triton X-100, EDTA, and SDS) but found sensitive by treating with proteolytic enzymes (proteinase K and trypsin) in comparison with untreated bacteriocin. Because of such biochemical characteristics, these antibacterial peptides could be possibly incorporated in the field of pharmacy to fulfil consumer’s demand for natural remedies

    Poor Quality of Sleep and its Relationship with Depression in First Year Medical Students.

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    Introduction: High incidence of depression has been reported in undergraduate medical students. Sleep disturbance has been associated with depressive symptoms and higher body mass index (BMI). This study evaluated the relationship between sleep disturbance measured by Pittsburgh Sleep Quality Index ( PSQI) and Epworth sleepiness scale (ESS) with BMI and depression measured by Beck Depression Inventory (BDI)  in 1st year  medical students. Method: Following Institutional Ethics Committee approval, 1st year medical students who volunteered for study and gave written informed consent (n=73) were administered PSQI, ESS & BDI questionnaires after seven months of admission. Height and weight were measured by standard method. Scores of PSQI, BDI and BMI were calculated and their interrelationship was measured statically.  Results: Poor quality of sleep (PSQI score greater or equal to five) and depression (BDI score eleven or greater) was seen in majority of students (64 and 60 % respectively). BMI was not significantly correlated with PSQI, ESS or BDI scores .There was significant positive correlation between PSQI and BDI (Pearson correlation, r = 0.410, P < 0.001), higher the BDI scores higher the PSQI scores. Conclusions: Poor sleep quality and depressive symptoms were observed in majority of 1st year medical students. Sleep quality and depressive symptoms were interrelated. Prevention and treatment strategies should target sleep as a factor that can potentially influence the development and course of Depression leading to poor academic performance. There is an urgent need to address this issue. Keywords: PSQI, BDI, Medical students, college students, adolescent health, freshman, freshers

    Chikungunya virus associated Guillain-Barre Syndrome with variable presentation: A case series.

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    Chikungunya Virus Is A Mosquito-borne Alpha Virus Which Occasionally Causes Neurologic Complications Including Guillain-barre Syndrome, Myelitis, Myopathies And Encephalitis. Pakistan Experienced Its First Chikungunya Outbreak In The Metropolis Of Karachi Officially Confirmed By World Health Organization In December 2016. During This Outbreak, Over 30,000 People Have Been Reported To Be Infected In Different Parts Of Karachi. We Report Four Cases Of Chikungunya Virus Infection Associated Guillain-barre Syndrome Having An Atypical Clinical Presentation And Variable Outcome. Each Case Presented As A Different Variant Of Gbs Including Acute Inflammatory Demyelinating Polyneuropathy, Acute Motor And Sensory Axonal Neuropathy And Pharyngeal-cervical-brachial
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