Performance enhancement of the solar still using textiles and polyurethane rollers.

The acquisition of clean drinking water in regions with limited power sources has been a challenge of paramount concern. Solar stills have emerged as a popular and sustainable option for obtaining clean water in such regions. This process involves employing solar radiation to heat up water, which is then condensed to obtain potable water. The present study introduces a solar still system that is both cost-effective and energy-efficient, while simultaneously ensuring sustainability. Fabric-coated polyurethane rollers with capillary action enhance evaporation area, leading to notable performance improvements. Water vapour condensed on the cooling chamber's inclined aluminium plate and collected in the distillate chamber within the solar still. The thermal, energetic, and economic performance and productivity of the proposed model were evaluated. The fabricated solar still boasted maximum instantaneous system efficiency and exergy efficiency of approximately 62.16% and 7.67%, respectively. This system's cost-effectiveness and performance improvements are particularly noteworthy. The daily average distillate productivity of the proposed still was estimated at 1.14 L/m2, resulting in an annual production rate of 416.54 L/year. The estimated cost of producing 1 L of distillate was 0.023 $.

The Comparative Performance of Phytochemicals, Green Synthesised Silver Nanoparticles, and Green Synthesised Copper Nanoparticles-Loaded Textiles to Avoid Nosocomial Infections.

In the current study, a sustainable approach was adopted for the green synthesis of silver nanoparticles, green synthesis of copper nanoparticles, and the investigation of the phytochemical and biological screening of bark, leaves, and fruits of Ehretia acuminata (belongs to the family Boraginaceae). Subsequently, the prepared nanoparticles and extracted phytochemicals were loaded on cotton fibres. Surface morphology, size, and the presence of antimicrobial agents (phytochemicals and particles) were analysed by scanning electron microscopy, dynamic light scattering, and energy-dispersive X-ray spectroscopy. The functional groups and the presence of particles (copper and silver) were found by FTIR and XRD analyses. The coated cotton fibres were further investigated for antibacterial (qualitative and quantitative), antiviral, and antifungal analysis. The study revealed that the herb-encapsulated nanoparticles can be used in numerous applications in the field of medical textiles. Furthermore, the utility of hygienic and pathogenic developed cotton bandages was analysed for the comfort properties regarding air permeability and water vapour permeability. Finally, the durability of the coating was confirmed by measuring the antibacterial properties after severe washing.

Superhydrophobicity, UV protection and oil/water separation properties of fly ash/Trimethoxy(octadecyl)silane coated cotton fabrics.

The presented study proposed simple and low-cost approach for improvement in UV protection and superhydrophobic properties of cotton fabrics by coating of mechanically activated fly ash particles. The maximum UV blocking was observed for 3 wt% fly ash, where UV transmittance decreased from 14.19% of untreated fabric to 0.11% of coated fabric. After subsequent treatment of Trimethoxy(octadecyl)silane (OTMS) on fly ash coated fabrics, the water contact angle was increased to 143°, 147° and 153° for fly ash concentration of 1, 2 and 3 wt% respectively. From Cassie-Baxter theories, the unwetted fraction of air pockets were estimated to be 43%, 55% and 67% respectively for 1, 2 and 3 wt% of fly ash particles. Furthermore, the coated fabrics showed great potentials for separation of floating oil layer, underwater oil droplet or oil/water mixture. The separation efficiency of 98%, 96%, 97% and 95% was obtained for selected model oils toluene, n-hexane, chloroform and petro ether, respectively.

Profile of psychiatric patients presenting to a tertiary care emergency department of Karachi.

This study reviewed the presentations of psychiatric patients admitted through the Emergency Department (ED), The Aga Khan University Hospital, Karachi. Psychiatric patients admitted through the ED to the psychiatry ward were compared to those admitted through the same units other than the psychiatry ward, from 2006 to 2010 using medical records. Psychiatric patients were defined as those in whom psychiatry consult was generated and 1127 cases were included in study. There were 550 (48.8%) female patients. Most common presentations in the ED were sleep-related problems (n=205, 15.9%) followed by aggressive behavior (n=191, 14.8%). Depression was the most common diagnosis made in the ED (n=331, 29.3%) and at the time of discharge from the hospital (n=354, 29.5%). Psychiatric patients presenting to the ED had signs and symptoms which one generally disregards. However, these minor indicators can lead to major events in a patient's life.

Risk factors for deliberate self-harm in patients presenting to the emergency departments of Karachi.

OBJECTIVE: To determine the risk factors for Deliberate Self-Harm (DSH) in patients presenting to the Emergency Departments (EDs) of three tertiary care hospitals of Karachi, Pakistan. STUDY DESIGN: Multicentre matched case control study. PLACE AND DURATION OF STUDY: EDs of the Aga Khan University Hospital, Karachi, Civil Hospital, Karachi and Jinnah Postgraduate Medical Centre, Karachi, from March 2011 to February 2012. METHODOLOGY: A total of 201 cases and 201 matched controls were taken from three hospitals situated in Karachi. All patients of 16 years and above presenting to the EDs of the hospitals with DSH attempt were invited to participate in the study. Controls were ED patients with complaints other than DSH. A control was matched with case for hospital, gender and age. Two questionnaires were used to collect information on the risk factors of DSH. Conditional Logistic Regression (CLR) was used to assess the association of various risk factors with DSH. RESULTS: Risk factors of DSH in Karachi included current history of mental disorder (OR = 4.53, 95% CI = 1.59 - 12.92), not sharing problems with someone (OR = 4.67, 95% CI = 2.4 - 9.0), living in rented houses (OR = 2.58, 95% CI = 1.37 - 4.84), Pathan ethnicity (OR = 5.05, 95% CI = 1.01-25.38) followed by others (OR = 3.88, 95% CI = 0.77 - 19.69) and Urdu speaking (OR = 2.71, 95% CI = 0.59 - 12.45). Absence of physical illness in the past month had an inverse association with DSH (OR = 0.17, 95% CI = 0.07 - 0.37). CONCLUSION: Mental illnesses, low socio-economic status and loneliness were the risk factors of DSH patients presenting to the three EDs of Karachi. Physical illness in the last month was protective against DSH in these patients. Psychiatric evaluation of DSH patients in the ED is important for early diagnosis and management of mental disorders.

DELIBERATE SELF-HARM PATIENTS VISITING PUBLIC AND PRIVATE EMERGENCY DEPARTMENTS OF KARACHI.

OBJECTIVE: To study the mode of attempted deliberate self-harm (DSH) in patients presenting to the Emergency Departments (ED) of public and private hospitals of Karachi, Pakistan. DESIGN: A cross sectional study. PLACE AND DURATION OF STUDY: Aga Khan University Hospital Karachi, Jinnah Post Graduate Medical Centre Karachi and Civil Hospital Karachi; March 2011 to February 2012. SUBJECTS AND METHODS: One hundred DSH cases from ED of a private sector hospital were compared with 101 patients from two public sector hospitals. RESULTS: DSH patients in the private hospital were mostly females (70%), had higher level of education (32%), did not share their problems (67%) with someone and had more mental disorders (28%). Patients from public hospitals were treated more for physical illnesses compared to private facility. Organophosphorus poisoning (90%) was a common mode of DSH in patients presenting to public hospitals; however significant number of organophosphorus poisoning (40%) was also seen in private hospital besides the benzodiazepine overdose (32%). CONCLUSION: Emergency Physicians working in the EDs, both public and private sector hospitals of Karachi, should have adequate knowledge of managing organophosphorus poisoning. As more and more cases are presenting to the EDs, there should be a public health initiative to control the illegal sale and availability of such compounds in Pakistan.