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Yasinzai AQK, Tareen B, Tracy K, Jamil N, Khan M, Ullah H, Raza M, Khan AU, Arif D, Waheed A, Sidhwa F, Misra S, Karki NR, Karim NA, Cavalcante L, Ullah A. Pancreatic ductal adenocarcinoma: exploring clinicopathological trends and racial disparities in a comprehensive U.S. population-based study. Clin Transl Oncol 2024:10.1007/s12094-024-03484-7. [PMID: 38615292 DOI: 10.1007/s12094-024-03484-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2024] [Accepted: 03/25/2024] [Indexed: 04/15/2024]
Abstract
INTRODUCTION Pancreatic ductal adenocarcinoma (PDAC) is a highly aggressive malignancy about 50% of PDAC are metastatic at presentation. In this study, we evaluated PDAC demographics, annual trend analysis, racial disparities, survival rate, and the role of different treatment modalities in localized and metastatic disease. METHODS A total of 144,824 cases of PDAC were obtained from the SEER database from 2000 to 2018. RESULTS The median age was 69 years, with a slightly higher incidence in males (52%) and 80% of all cases were white. Among cases with available data, 43% were grade III tumors and 57% were metastatic. The most common site of metastasis was the liver (15.7%). The annual incidence has increased steadily from 2000 to 2018. The overall observed (OS) 5-year survival rate was 4.4% (95% CI 4.3-4.6%), and 5 years cause-specific survival (CSS) was 5% (95% CI 5.1-5.4%). The 5-year survival with multimodal therapy (chemotherapy, surgery, and radiation) was 22% (95% CI 20.5-22.8%). 5-year CSS for the blacks was lower at 4.7% (95% CI 4.2-5.1%) compared to the whites at 5.3% (95% CI 5.1-5.4%). Multivariate analysis found male gender and black race associated with worse prognosis. Kaplan-Meier survival analysis found multimodal therapy to have the best outcomes in all three stages. CONCLUSION PDAC is an aggressive malignancy with male gender and black race are associated with a poor prognosis. Surgery with chemoradiation was associated with the best overall survival. With steadily increasing rates of PDAC, improved treatment modalities are paramount to improving survival in these patients.
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Affiliation(s)
| | - Bisma Tareen
- Department of Medicine, Bolan Medical College, Quetta, 83700, Pakistan
| | | | - Nimra Jamil
- Department of Medicine, Bolan Medical College, Quetta, 83700, Pakistan
| | - Marjan Khan
- Internal Medicine, Marshfield Medical Center, Marshfield, USA
| | - Hafeez Ullah
- Department of Medicine, Bolan Medical College, Quetta, 83700, Pakistan
| | - Muhammad Raza
- Department of Medicine, Bolan Medical College, Quetta, 83700, Pakistan
| | - Amin Ullah Khan
- Department of Medicine, Bolan Medical College, Quetta, 83700, Pakistan
| | - Dauod Arif
- Department of Oncology Developmental Therapeutics, Novant Health, Charlotte, NC, USA
| | - Abdul Waheed
- Department of Surgery, San Joaquin General Hospital, French Camp, CA, 95231, USA
| | - Feroze Sidhwa
- Department of Surgery, San Joaquin General Hospital, French Camp, CA, 95231, USA
| | - Subhasis Misra
- Department of Surgery, BayCare Health System, Tampa, FL, USA
| | - Nabin Raj Karki
- Department of Oncology, Mitchell Cancer Institute, University of South Alabama, Mobile, USA
| | - Nagla Abdel Karim
- Department of Hematology-Oncology, Inova Schar Cancer Institute, University of Virginia, Fairfax, VA, 22031, USA
| | - Ludimila Cavalcante
- Department of Oncology Developmental Therapeutics, Novant Health, Charlotte, NC, USA
| | - Asad Ullah
- Department of Pathology, Texas Tech University Health Sciences Center, Lubbock, TX, 79430, USA
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Biswas D, Nag S, Khan AU, Ahamed F, Karim MR, Hasan MR, Haque AK. Hypoalbuminaemia as a Marker of Severity of Patients of Community Acquired Pneumonia. Mymensingh Med J 2023; 32:968-974. [PMID: 37777888] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/02/2023]
Abstract
Community-acquired pneumonia (CAP) is a common presentation with an acute infection of the pulmonary parenchyma occurring in the community level. Despite the availability of potent antibiotics, it remains as a serious illness with significant morbidity and mortality in both developed and developing countries. This study was undertaken to determine the relation between serum Albumin and severity of CAP. This was a cross sectional descriptive study which was carried out in the Department of Medicine of Mymensingh Medical College Hospital (MMCH), Bangladesh from July 2019 to December 2019. The sample size was 67. Purposive sampling technique was employed. Patients of community acquired pneumonia (CAP), aged ≥14 years of both sex with recently developed radiological pulmonary shadowing with compatible clinical symptoms and signs were included. Patients who were chronically immunosuppressed, with chronic starvation, advanced liver disease or chronic kidney disease with or without receiving haemodialysis were excluded. Data analysis was done by SPSS software for Windows (version 23.0). The mean age 65.7±15.3 years, majority 13(19.4%) patients had chronic lung disease, 12(17.9%) had diabetes mellitus, 9(13.4%) had heart failure, 6(9.0%) had cerebrovascular disease, 6(9.0%) had neoplastic disease and 5(7.5%) had chronic renal failure. Majority 22(32.8%) patients had CURB-65 score 3, out of which 12(54.5%) had albumin level <20g/l, 9(40.9%) had albumin level 20.0-24.9g/l and 1(4.5%) had albumin level 25-29g/l. 17(25.4%) had score 4-5 out of which 10(58.8%) had albumin level <20g/l and 7(41.2%) had albumin level 20.0-24.9g/l, 15(22.4%) had score 2 and 13(19.4%) had score 0-1. Negative significant correction (r=-0.782; p=0.001) was found between CURB-65 score and albumin level. Significant number of patients with severe CAP show low serum albumin level at admission which is statistically significant when compared with CURB-65 score. Thus hypoalbuminaemia may be a good marker of severity of patients with CAP.
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Affiliation(s)
- D Biswas
- Dr Debashish Biswas, Indoor Medical Officer, Department of Medicine, Mymensingh Medical College Hospital (MMCH), Mymensingh, Bangladesh
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Khan AU, Ali Y. Enhancement of resilience and quality of cold supply chain under the
disruptions caused by COVID-19: A case of a developing country. Australian Journal of Management 2023; 48:341-365. [PMCID: PMC10083693 DOI: 10.1177/03128962221095596] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/18/2023]
Abstract
Cold supply chain (CSC) comprises temperature-sensitive processes, starting from
the supply of raw materials, manufacturing, and finally the delivery of finished
goods to the end consumers via transport services. Pandemics such as COVID-19
pose threats to its overall functioning and to cater to this issue, the study
will ensure the sustainable functioning of CSC by recommending resilience
strategies. To do so, the COVID-19 disruptions in the CSC and the resilient
sustainability strategies were collected via a vigorous literature review and
were analyzed via a Fuzzy QFD technique. The results concluded “crisis
simulation,” “identification and securing of logistics,” and “digitalization of
cold supply chain” as the top three strategies to ensure the resilience of CSC
under disruptions caused by COVID-19. The study recommends necessary steps to
the policymakers to ensure a resilient and quality effective CSC. The
application of the study proves to be the first of its kind in a developing
country such as Pakistan. JEL Classification: C54, D81, H12
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Affiliation(s)
- Amin Ullah Khan
- Department of Economics and Law, University of
Macerata, Macerata, Italy
| | - Yousaf Ali
- Yousaf Ali, School of Management Sciences,
Ghulam Ishaq Khan Institute of Engineering Sciences and Technology, Topi 23640,
Swabi, KPK, Pakistan.
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Saeed MA, Waheed U, Ehtisham-Ul-Haque S, Khan AU, Kashif M, Qamar MF, Ghafoor A, Saqlain M, Asghar J. Incidence and molecular characterization of extended-spectrum beta-lactamase (ESBL)-producing Salmonella enterica and Escherichia coli of avifauna origin in Pakistan. Pol J Vet Sci 2023; 26:47-55. [PMID: 36961268 DOI: 10.24425/pjvs.2023.145006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
Members of Enterobacteriaceae are known to produce extended-spectrum beta-lactamases (ESBL) which hydrolyze the beta-lactam group of antibiotics. The existence of ESBL-producing Salmonella enterica (S. enterica) and Escherichia coli (E. coli) harbored by urban avifauna was investigated in this study. Dropping samples (n= 180) were collected from six different bird species in the district Jhang, Punjab province, Pakistan. Isolation and identification of ESBL isolates were made by using cefotaxime- (4 mg/L) supplemented MacConkey agar and double disc synergy test (DDST). Polymerase chain reaction (PCR) was performed for the detection of four different ESBL genes including blaCTX-M, blaTEM, blaSHV and blaOXA. A total of 42.69% isolates were confirmed as ESBL via DDST including 30.64% S. enterica and 49.54% E. coli. The incidence of ESBL S. enterica and ESBL E. coli was found highest in egret (Ardea alba) and pigeon (Columba livia) as 64.28% and 78.95%, respectively. The blaCTX-M gene was detected in 57.89% and 64.81% of isolates of S. enterica and E. coli, respectively. Among other genes in S. enterica and E. coli, blaTEM (21.05%, 20.4%); blaSHV (15.78%, 9.26%), and blaOXA (5.26%, 5.56%) were detected, respectively. All of the tested isolates were found resistant to at least one of the thirteen antimicrobial agents except meropenem. To the best of our knowledge, this is the first study reporting the incidence and genetic diversity of ESBL bacteria associated with urban avifauna in Pakistan. The urban avifauna can serve as a potential subject of bio-surveillance to monitor the emergence of antimicrobial-resistant bacteria.
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Affiliation(s)
- M A Saeed
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - U Waheed
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - S Ehtisham-Ul-Haque
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - A U Khan
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - M Kashif
- Department of Clinical Sciences, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - M F Qamar
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - A Ghafoor
- Institute of Microbiology, University of Veterinary and Animal Sciences, Outfall Road, Lahore, 54000, Pakistan
| | - M Saqlain
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
| | - J Asghar
- Department of Pathobiology, University of Veterinary and Animal Sciences, Lahore, CVAS Campus, 12-Km Chiniot Road, Jhang, 35200, Pakistan
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Zia A, Hakim S, Khan AU, Bey A, Ateeq H, Parveen S, Khalid S, Yusufi F. Bone markers and bone mineral density associates with periodontitis in females with poly-cystic ovarian syndrome. J Bone Miner Metab 2022; 40:487-497. [PMID: 35072780 DOI: 10.1007/s00774-021-01302-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Accepted: 12/10/2021] [Indexed: 12/18/2022]
Abstract
INTRODUCTION Studies suggest an association between poly-cystic ovarian syndrome (PCOS) and chronic periodontitis (CP), both being inflammatory conditions. However, insufficient evidence assesses the impact of this inflammation on bone metabolism and bone turnover markers (BTMs). The present study aimed to determine the association between BTMs, bone mineral density (BMD), and clinical periodontal parameters in PCOS women with CP. MATERIALS AND METHODS Three groups, each with 40 newly diagnosed (1) PCOS+CP, (2) PCOS alone, (3) CP alone, and fourth group (n = 20) systemically and periodontally healthy females aged 18-30 years were included in the study. Full mouth clinical periodontal parameters, C-terminal telopeptides of type I collagen (CTX), bone alkaline phosphatase (ALP), BMD and 25-hydroxyvitamin D (VD) were recorded for all. RESULTS Low BMD (0.89 ± 0.11 g/cm2), increased CTX levels (2.76 ± 4.64 ng/ml), decreased bone ALP levels (11.09 ± 6.86 ng/ml), higher VD levels (289.02 ± 168.28 nmol/l) and poor clinical periodontal status were observed in PCOS + CP females. BMD-spine showed weak positive correlation with CTX, bone ALP, VD (r = 0.02, r = 0.07, r = 0.15, respectively) in PCOS + CP group. ANCOVA depicted covariates had no confounding effect. Multiple regression model explained 21.0% for BMD-spine and 12.7% for BMD-femur of total variability signifying association with all measured parameters among all groups. CONCLUSION Enhanced inflammatory thrust by periodontitis increases CTX levels and decreases bone ALP and BMD levels in women with PCOS. Screening PCOS women for periodontal disease and vice versa may have a direct bearing on overall bone health.
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Affiliation(s)
- Afaf Zia
- Department of Periodontics and Community Dentistry, Dr. Ziauddin Ahmed Dental College (DRZADC), Aligarh Muslim University (AMU), Aligarh, 202002, Uttar Pradesh, India.
| | - S Hakim
- Department of Obstetrics and Gynaecology, Jawaharlal Nehru Medical College and Hospital (JNMCH), AMU, Aligarh, Uttar Pradesh, India
| | - A U Khan
- Interdisciplinary Biotechnology Unit, AMU, Aligarh, Uttar Pradesh, India
| | - A Bey
- Department of Periodontics and Community Dentistry, Dr. Ziauddin Ahmed Dental College (DRZADC), Aligarh Muslim University (AMU), Aligarh, 202002, Uttar Pradesh, India
| | - H Ateeq
- Department of Biochemistry, AMU, Aligarh, Uttar Pradesh, India
| | - S Parveen
- Department of Obstetrics and Gynaecology, Jawaharlal Nehru Medical College and Hospital (JNMCH), AMU, Aligarh, Uttar Pradesh, India
| | - S Khalid
- Interdisciplinary Biotechnology Unit, AMU, Aligarh, Uttar Pradesh, India
| | - Fnk Yusufi
- Department of Statistics and Operations, AMU, Aligarh, Uttar Pradesh, India
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Shah SIA, Tipu MY, Aslam A, Khan AU, Shafee M, Khan SA, Khan NU, Akbar A. Elucidating antiviral activity of Curcuma longa against H9 N2 influenza virus using embryonated chicken egg model. Trop Biomed 2021; 38:353-359. [PMID: 34508343 DOI: 10.47665/tb.38.3.078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Curcumin is a potent antimicrobial herb used traditionally as a spice in culinary. This study was designed to evaluate the antiviral effects of curcuma longa extract against H9 influenza virus. A total of 60 embryonated eggs were equally divided into 5 groups with 12 eggs in each group. Group 1 (G1) served as uninfected negative control. Whereas Group 2 (G2) was kept as positive control infected with known virus @ 0.2 ml with 10-9.3 EID50. Group 3 (G3) was offered Curcuma longa @ 0.2 mg/0.2 ml and H9N2 virus (@ 0.2 ml with 10-9.3 EID50. Similarly, Group 4 (G4) was inoculated with extract of Curcuma longa @ 0.2 mg/0.2 ml per egg, whereas Group 5 (G5) was given Ribazole @ 0.2 ml/ egg. The crude extract and virus were administered on the 15th day of incubation and were checked after every 24 hours up to 96th hour post inoculation by random selection of 3 eggs. Death and survival rate were noted in all groups. Gross and histopathological lesions were also observed. Results revealed that Curcuma longa extract had significantly (p<0.05) reduced the mortality rate of embryos infected with H9N2 virus. In G3, increased lymphocytes and mild fatty changes were seen in liver. Whereas, mature RBCs, plasma cells and some lymphoblast's were observed in Spleen. Similarly, the bursa follicles were with lymphocytic aggregation. The G4 (Curcuma longa) and G5 (Ribazole) were with maximum embryo survival after 48 and 72 h post inoculation. This study revealed potential antiviral activity of Curcuma longa against H9N2 influenza viruses and can be opted as alternative to antibiotics and antiviral drugs to minimize the antimicrobial resistance in human and animal population.
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Affiliation(s)
- S I A Shah
- Department of Pathology, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - M Y Tipu
- Department of Pathology, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - A Aslam
- Department of Pathology, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - A U Khan
- Department of Pathology, University of Veterinary & Animal Sciences, Lahore, Pakistan
| | - M Shafee
- Center for Advanced Studies in Vaccinology & Biotechnology (CASVAB) University of Balochistan, Quetta, Pakistan
| | - S A Khan
- Center for Advanced Studies in Vaccinology & Biotechnology (CASVAB) University of Balochistan, Quetta, Pakistan
| | - N U Khan
- Abdul Wali Khan University, Mardan Khyber Pakhtunkhwa, Pakistan
| | - A Akbar
- Department of Microbiology, University of Balochistan, Quetta 87300 Balochistan, Pakistan
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Ullah I, Afridi SG, Khan AU, Israr M, Ali A, Shams S, Jabeen H, Rasool A, Akbar F, Rahat MA, Haris M, Khan A, Siraj M, Shah M. PCR-RFLP Based genetic diversity of Plasmodium vivax genotypes in district Mardan, Pakistan. BRAZ J BIOL 2021; 82:e241110. [PMID: 34133560 DOI: 10.1590/1519-6984.241110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 09/09/2020] [Indexed: 11/22/2022] Open
Abstract
Plasmodium vivax is the most common human malaria parasite in Asian countries including Pakistan. Present study was designed to explore the genetic diversity of plasmodium vivax genotypes based on Pvmsp-3α and Pvmsp-3βgenes using allelic specific nested PCR and RFLP assays markers from field isolates in district Mardan, Pakistan. Blood samples of 200 P. vivax malarial patients were collected after taking their written informed consent. Genetic diversity in nested PCR products was determined by Restriction Fragment Length Polymorphism (RFLP) utilizing Alu1 and PstI restriction enzymes for alpha and beta gene products digestion, respectively. For analysis the genetic diversity of the sub allelic variants of Pvmsp3α and Pvmsp3β genes, Chi-Square test was performed by utilizing Minitab programming software 18. The P value 0.05 was considered as statistically significant. For Pvmsp-3α genes after gel electrophoresis of digested products, four distinct genotypes were obtained from total of 50 samples; type A: 35 (70%) (1.5-2.0 kb), 12 of type B (24%) (1.5-1.7 kb), 2 of type C (4%) (0.5-1.5) and one for type D (2%) (0.5-0.65 kb) which could be characterized into 9 allelic pattern (A1-A4, B1-B3, C1, D), in which A3 remained the most predominant. For Pvmsp-3βgenes, three distinct genotypes were obtained from 50 samples; 40(80%) of type A (1.5-2.5 kb), 9 (18%) of type B (1.0-1.5kb) and 1(2%) of type C (0.65 kb) which could be characterized into 6 allelic patterns (A1-A3, B1-B2, and C1). Most dominant one in Type A was A1 alleles which were noted (46%), while in Type B, the most dominant were B1 (10%).This study is the first ever report of molecular epidemiology and genetic variation in Pvmsp-3α and Pvmsp-3β genes of P. vivax isolates by using PCR/RFLP from District Mardan and showed a remarkable level of genetic diversity in the studied genes of circulating parasites in the study area. The results of this study will contribute in future studies about the genetic structure of parasite and vaccine development against the malaria.
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Affiliation(s)
- I Ullah
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - S G Afridi
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - A U Khan
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - M Israr
- Department of Forensic Sciences, University of Swat, Swat, Pakistan
| | - A Ali
- Department of Biochemistry, Saidu Medical College, Saidu Sharif, Swat, Pakistan
| | - S Shams
- Department of Biochemistry, Abdul Wali Khan University Mardan, Mardan, Pakistan
| | - H Jabeen
- Department of Microbiology, Women University Mardan, Mardan, Pakistan
| | - A Rasool
- Centre for Biotechnology & Microbiology, University of Swat, Swat, Pakistan
| | - F Akbar
- Centre for Biotechnology & Microbiology, University of Swat, Swat, Pakistan
| | - M A Rahat
- Department of Genetics, Hazara University Mansehra, Pakistan
| | - M Haris
- Department of Genetics, Hazara University Mansehra, Pakistan
| | - A Khan
- Department of Genetics, Hazara University Mansehra, Pakistan
| | - M Siraj
- Department of Zoology, Abbottabad University of Science & Technology, Abbottabad, Pakistan
| | - M Shah
- Centre for Animal Sciences & Fisheries, University of Swat, Swat, Pakistan
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Tariq H, Ali Y, Khan AU, Petrillo A, De Felice F. Sustainable production of diapers and their potential outputs for the Pakistani market in the circular economy perspective. Sci Total Environ 2021; 769:145084. [PMID: 33486174 DOI: 10.1016/j.scitotenv.2021.145084] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/04/2021] [Accepted: 01/05/2021] [Indexed: 06/12/2023]
Abstract
One of the challenging issues of any country's agenda today is the management of solid waste in the circular economy and eco-efficiency perspective. In this context, there has been much debate about the disposal of diapers, but the current research lacks data for developing countries. Furthermore, the research lacks quantification of data, in terms of output products generated through sustainable waste management practices particularly for diapers. Thus, this research aims to develop a quantitative study based on Life Cycle Assessment (LCA) and Life Cycle Costing Analysis (LCCA) which help to evaluate the overall eco-efficiency of various disposal methods by taking into account their net input and resultant monetary value, in the context of Pakistan. To cover limitations of LCA approach, results have been compared along with the expert's opinion using the well-known multi-criteria method Fuzzy logic and Technique for Order of preference by similarity to ideal solution (TOPSIS) technique. Human health and environment have been used as end-point indicators. The main research result points out that incorporating small scale incineration plants along with recycling using Thermal Pyrolysis Hydrolysis (TPH) plants can help to sustainably dispose-off diapers. The results also indicate the importance for policy makers and industrial sector to find solutions to facilitate implementation of circular economy principles for diapers. In fact, the recycling of diapers using waste-to-energy technologies is a significantly eco-efficient alternative for the Pakistani market, which can be pivotal for Sustainable development and initiation of a circular economy model.
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Affiliation(s)
- Hassaan Tariq
- Department of Management Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences & Technology, Topi, Pakistan.
| | - Yousaf Ali
- Department of Management Science, Ghulam Ishaq Khan Institute of Engineering Sciences & Technology, Topi, Swabi, KPK, Pakistan.
| | - Amin Ullah Khan
- Department of Management Sciences, Ghulam Ishaq Khan Institute of Engineering Sciences & Technology, Topi, Pakistan.
| | - Antonella Petrillo
- University of Naples "Parthenope", Department of Engineering, Napoli, Isola C4, Centro Direzionale Napoli, Italy.
| | - Fabio De Felice
- Università degli Studi di Cassino e del Lazio Meridionale, via G. Di Biasio, 43, 03043 Cassino, FR, Italy.
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Tahir AA, Ali KM, Khan AU, Kamal S, Hussain A, Khan AU. 321 Role of Antibiotics in Acute uncomplicated diverticulitis, A Systematic Review and Meta-Analysis. Br J Surg 2021. [DOI: 10.1093/bjs/znab134.404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Abstract
Introduction
Diverticular disease is a common health problem with a wide clinical spectrum. About 75% of the patients would have uncomplicated diverticulitis. Cornerstones of treatment are antibiotics, analgesia, and dietary advice. Recent evidence has shown that its treatment is controversial, questioning the use of antibiotics. Aim is to assess the role of antibiotics in the treatment of acute uncomplicated diverticulitis.
Method
This is a systematic review and Meta-analysis. Literature review of the available studies was conducted using search engines like Pubmed, Medline, Embase, Google Scholar, and Cochrane databases. Statistical analysis was conducted using RevMan5.4.
Results
Out of 1754 records 1324 were duplicates, 430 studies were screened. 395 were further excluded.35 full text articles were assessed and in the final review 10 studies were included. PRISMA guidelines were used. Pooled OR for recurrence = 0.92 (95% CI = 0.74 to 1.13). Pooled OR for Hospital stay= -0.66 (95% CI= -1.12 to -0.21). Pooled OR for complications = 1.06 (95% CI = 0.69 to 1.64). Pooled OR for treatment failure= 1.24 (95% CI = 0.90-1.69).
Conclusions
We conclude that from the available evidence antibiotics have no role in reducing recurrence, complications, treatment failure, and duration of hospital stay in acute uncomplicated diverticulitis.
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Affiliation(s)
- A A Tahir
- University Hospital of North Midlands, Stoke on Trent, United Kingdom
| | - K M Ali
- Wishaw General Hospital, Livingston, United Kingdom
| | - A U Khan
- Medical University of Pleven, Pleven, Bulgaria
| | - S Kamal
- Pak International Medical college, Peshawar, Pakistan
| | - A Hussain
- Mid Cheshire NHS Foundation Trust, Crewe, United Kingdom
| | - A U Khan
- Mid Cheshire NHS Foundation Trust, Crewe, United Kingdom
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Islam AS, Ara ZG, Bhuiyan GR, Khan AU, Khan MM. Clinicopathological Findings of Haematological Malignancies in Hospital Admitted Patients. Mymensingh Med J 2021; 30:28-34. [PMID: 33397847] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The global burden of cancer is gradually rising. In our context we are also facing the same problem. Hematological malignancies (HMs) are important component of cancer. Early diagnosis and proper treatment at right time, a good number of HMs patients can be cured or lengthening the survival period. For this purpose a proper diagnostic criteria should be developed in our settings. This research work is carried out to find out the clinicopathological findings of HMs in our population. This was a cross-sectional descriptive type of observational study conducted in the Department of Medicine and Hematology of Mymensingh Medical College Hospital, Bangladesh from July 2016 to June 2017. Total 45 patients were purposively selected on the basis of inclusion and exclusion criteria with a view to observe the clinical and laboratory findings. Mean age of the patients was 44.5 years. Highest average age (70 years) was found in chronic lymphocytic leukaemia (CLL) and lowest (29 years) in acute lymphoblastic leukaemia (ALL). Majority of the respondents were male in all HMs except in non-Hodgkin's lymphoma (NHL) where male-female ratio was 0.3:7. Among male most of them were farmers or day laborers and most of the females were housewife. Almost all patients were exposed to single or multiple exposures like smoking, betel nut, betel leaf, tobacco leaf, fertilizer or pesticides. Acute myeloblastic leukaemia (AML) was the leading HMS with 31.11% representation followed by non-Hodgkin's lymphoma (NHL) 20%, Hodgkin's lymphoma (HL) 15.56%, acute lymphoblastic leukaemia (ALL) 11.11%, chronic myeloid leukaemia (CML) 11.11%, multiple myeloma (MM)6.67% and chronic lymphocytic leukaemia (CLL) 4.44%. Duration of symptoms was vary from 2 days to 5 years. In acute leukaemia duration was short (average 2 months). Common clinical findings were anaemia (95.5%), fever (80.0%), hepatosplenomegaly (42.2%), lymphadenopathy (40.0%), bony tenderness (22.2%) and bleeding manifestations (15.5%). Some uncommon findings were also reported like menorrhagia, facial nerve palsy, arthritis and disorientation. Common laboratory abnormalities were high ESR, anaemia, leukocytosis, thrombocytopenia and immature cell in PBF especially in acute leukaemia. Clinical suspicion along with history of positive exposure indicates strong possibilities of haematological malignancies. It should be kept in mind that haematological malignancies may also present with some isolated uncommon findings.
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Affiliation(s)
- A S Islam
- Dr ASM Shafiqul Islam, Assistant Registrar, Infectious and Tropical Disease, Mymensingh Medical College Hospital (MMCH), Bangladesh; E-mail:
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Khan AU, Ali Y. ANALYTICAL HIERARCHY PROCESS (AHP) AND ANALYTIC NETWORK PROCESS METHODS AND THEIR APPLICATIONS: A TWENTY YEAR REVIEW FROM 2000-2019. IJAHP 2020. [DOI: 10.13033/ijahp.v12i3.822] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
This research aims to analyze a literature review of publications that have incorporated the Analytical Hierarchy Process (AHP) and Analytic Network Process (ANP) methods. The AHP and ANP methods have contributed to decision-making in complex situations in recent years and possess widespread applications. Such applications are spread over the years with publications in various major areas such as engineering/technology/applied sciences, social sciences, health sciences, and environmental studies. These two methods provide multiple solutions to researchers in these fields, which is why they are being considered in the current study. For this purpose, data was collected from 920 research papers after a vigorous literature review using different search engines. This paper aims to classify the publications on AHP and ANP methods from the years 2000 to 2019 to identify recognized journals based on their indexes. Furthermore, another objective of this study is to compare total publications by year, publications by field by year, and lastly, observe the distribution by country of the studies. This paper concludes that the highest number of publications are from Turkey, and the highest number of publications used AHP method applications in every category. Most of the publications belonged to the technical fields, followed by social sciences. The study concluded that the AHP method is more widely preferred by researchers in almost every field and application because it tends to produce more accurate results than the ANP.
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Abstract
PurposeThis paper aims to explore the impact of lean, Six Sigma and environmental sustainability on the performance of small and medium enterprises (SMEs) in Pakistan. The firm performance has been measured in terms of operational, business and environmental performance.Design/methodology/approachA survey-based methodology is adopted for collecting data from the main cities of Punjab, Pakistan. SMEs related to different industries such as service, manufacturing, automotive and retail were targeted. The data gathered were ordinal, and Spearman's correlation test was used as the data analysis technique.FindingsThe findings indicated that the three management styles positively impacted the environmental performance of SMEs. Moreover, no significant relationship was found between the three management styles and the SMEs' business and operational performance.Research limitations/implicationsTo counter the inefficient and wasteful practices of SMEs and their detrimental impact on overall firm performance, SMEs have to refocus and reconfigure their management strategies. It is implied to use lean, Six Sigma and environmental sustainability practices to achieve this goal.Originality/valueThe study empirically investigates the impact of lean, Six Sigma and environmental sustainability on the performance of SMEs in Pakistan, which is the first study to be conducted in the Pakistani context.
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Aslam MN, Sohaib M, Khan AU, Ali S, Amjad A, Ahmed S. Lipids Oxidative Stability and Microbial Shelf Life Quality of Licorice (Glycyrrhiza glabra L.) Extract Supplemented Chicken Patties. Braz J Poult Sci 2020. [DOI: 10.1590/1806-9061-2020-1316] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- MN Aslam
- University of Veterinary and Animal Sciences, Pakistan
| | - M Sohaib
- University of Veterinary and Animal Sciences, Pakistan
| | - AU Khan
- University of Veterinary and Animal Sciences, Pakistan
| | - S Ali
- University of Veterinary and Animal Sciences, Pakistan
| | - A Amjad
- Bahauddin Zakariya University, Pakistan
| | - S Ahmed
- Cholistan University of Veterinary and Animal Sciences, Pakistan
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Abstract
Sports is an effective vehicle that is being adopted by almost every country to improve ties with other countries. India and Pakistan share a long border, but do not share a very pleasant history. Over the years, these two countries have shared a fierce rivalry and no measures that have been taken have had a long-term positive impact on their relationship. None of the attempts at reconciliation have proved to be completely successful, and the relationship remains unbalanced. The factors that can improve the ties between the two countries are numerous, and sports is one of them. The objective of this study is to determine how much of an influence cricket, being the most popular sport in both countries, has on the overall relationship between them. For this purpose, data was gathered from people from both countries through a questionnaire-based survey and then analyzed by MCDM approaches like AHP (Analytic Hierarchy Process) and TOPSIS (Technique for Order Performance by Similarity to Ideal Solution). After performing the quantitative analysis, the study hopes to come to a solid conclusion about what people from both countries think about which alternative has the greatest influence on the ties between the two countries, and how the selected factors are influenced by the type of cricket matches played between India and Pakistan. The positive results obtained from this research could be of great importance for the governments as well as for the people of both countries. This can divert the minds of people and politicians from all the controversies and wars in the past, and help move towards more healthy competition on the sports field.
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Abstract
Nitrogen is one of the most significant nutrients needed for the proper growth and development of crops and other plants. In synthetic nitrogen fertilizers, solid urea is the largest source of nitrogen (N) as a nutrient. Prilling, granulation, and hybrid systems are the commercial processes used for the production of urea. One of the biggest challenges involved in the determination and implementation of those alternatives is rationalized decision making. The objective of this research study is to evaluate these processes by considering some of the significant attributes like profit, environmental friendliness, process flexibility and reliability to determine which process is the most optimal. The results show that the prilling process is the best technology for urea production. It is the most optimal process in terms of profitability and reliability, and is therefore widely used in the fertilizer industry. Prilling is not the best option when it comes to the environment when compared to granulation. The granulation process is not the best fit for the commercial production of urea because it is not a reliable process, especially for high agricultural demands and market competition. The results show that it would be very difficult to keep up with the rapid growth of the population using the granulation process. If the environmental and urea quality concerns are considered, the hybrid system is the highest priority and may be preferred.
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Khan AU, Hossain MA, Rahman MA, Rahman HW, Reza MA, Khan MK, Mahmud AA. Estimation of Vitamin D levels among Physicians Working in a Tertiary Level Hospital of Bangladesh. Mymensingh Med J 2019; 28:322-327. [PMID: 31086146] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Vitamin D is essential for the body to regulate calcium and phosphate levels and mineralization of bone. It is synthesized in the skin after ultraviolet radiation exposure or obtained in the diet to a less extent. Vitamin D deficiency is attracting attention due to higher prevalence in different populations. Physicians of Bangladesh are supposed to be vulnerable to low Vitamin D levels owing to long indoor work hours in both government and private settings. The study was conducted to evaluate Vitamin D status among physicians working in a tertiary level public hospital of Bangladesh. The cross sectional descriptive study was carried out at Mymensingh Medical College Hospital during the period of January 2018 to June 2018. Data were collected from purposively selected 102 doctors of different levels using a case record form. Interview, measurements and laboratory investigations were done accordingly. Vitamin D levels were categorized as deficient (<20.00ng/L), Insufficient (20.00-29.00ng/L), Sufficient (30.00-100.00ng/L) and Potential Toxicity (>100.00ng/L). Among 102 doctors 79(77.5%) were male and 23(22.5%) were female. Maximum (60.8%) were in the age group of 31 years to 50 years. Mean±SD age of the subjects was 49.9±3.61years. Vitamin D deficiency was found in 19(18.6%) subjects and insufficiency was in 49(48.0%) of the subjects. On the other hand 34(33.3%) subjects had sufficient Vitamin D levels. Potential Vitamin D toxicity was not found in any of the subjects. Vitamin D deficiency was found more in female (30.4%) than male (15.2%) but insufficiency was found more in male (50.6%) than female (39.1%). The study revealed that 66.6% physicians had either deficiency or insufficiency of Vitamin D. Exposure to sunlight, dietary intake and Vitamin D supplementation should be considered to increase the status of Vitamin D levels in Physicians of Bangladesh.
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Affiliation(s)
- A U Khan
- Dr Mohammed Amdad Ullah Khan, Assistant Professor, Department of Medicine, Mymensingh Medical College (MMC), Mymensingh, Bangladesh; E-mail:
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Idrees MA, Younus M, Farooqi SH, Khan AU. Retraction notice to "Blackleg in cattle: Current understanding and future research perspectives- A review" [Microbial Pathogenesis 120 (2018) 176-180]. Microb Pathog 2019; 126:407. [PMID: 30704615 DOI: 10.1016/j.micpath.2018.12.027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- M A Idrees
- Department of Pathobiology, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan
| | - M Younus
- Department of Pathobiology, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan
| | - S H Farooqi
- Department of Clinical Studies, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan
| | - A U Khan
- Department of Pathobiology, College of Veterinary and Animal Sciences, 35200, Jhang, Pakistan
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Hayat T, Nadeem S, Khan AU. Rotating flow of Ag-CuO/H 2O hybrid nanofluid with radiation and partial slip boundary effects. Eur Phys J E Soft Matter 2018; 41:75. [PMID: 29926290 DOI: 10.1140/epje/i2018-11682-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Accepted: 05/23/2018] [Indexed: 06/08/2023]
Abstract
The main object of the present paper is to examine and compare the improvement of flow and heat transfer characteristics between a rotating nanofluid and a newly discovered hybrid nanofluid in the presence of velocity slip and thermal slip. The influence of thermal radiation is also included in the present study. The system after applying the similarity transformations is solved numerically by using the bvp-4c scheme. Additionally, numerical calculations for the coefficient of skin friction and local Nusselt number are introduced and perused for germane parameters. The comparison between water, nanofluid and hybrid nanofluid on velocity and temperature is also visualized. It is observed that the velocity and temperature distributions are decreasing functions of the slip parameter. Temperature is boosted by thermal radiation and rotation. It is found that the heat transfer rate of the hybrid nanofluid is higher as compared to the traditional nanofluid.
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Affiliation(s)
- Tanzila Hayat
- Department of Mathematics, Quaid-i-Azam University, 44000, Islamabad, Pakistan
| | - S Nadeem
- Department of Mathematics, Quaid-i-Azam University, 44000, Islamabad, Pakistan
| | - A U Khan
- Department of Mathematics, Quaid-i-Azam University, 44000, Islamabad, Pakistan.
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Idrees MA, Younus M, Farooqi SH, Khan AU. Blackleg in cattle: Current understanding and future research perspectives- A review. Microb Pathog 2018; 120:176-180. [PMID: 29733903 DOI: 10.1016/j.micpath.2018.04.047] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2018] [Revised: 04/21/2018] [Accepted: 04/23/2018] [Indexed: 11/29/2022]
Abstract
Blackleg is an endogenous acute infection that principally affects cattle. The disease is caused by Clostridium chauvoei (C. chauvoei), an anaerobic spore forming bacterium. Control of this disease is based on stringent husbandry measures and scheduled vaccination plan. In recent years, the major virulence factors of C. chauvoei have been discovered and described. However, the pathogenesis of blackleg in cattle and in particular, circulation of the pathogen from point of entry to target tissues is yet not fully elucidated. This review summarizes the latest review of literature that significantly contributed for understanding the disease in cattle, and provides a foundation to preventive strategies.
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Affiliation(s)
- M A Idrees
- Department of Pathobiology, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan
| | - M Younus
- Department of Clinical Studies, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan
| | - S H Farooqi
- Department of Clinical Studies, KBCMA, College of Veterinary and Animal Sciences, 51600, Narowal, Pakistan.
| | - A U Khan
- Department of Pathobiology, College of Veterinary and Animal Sciences, 35200, Jhang, Pakistan
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20
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Rouf MA, Khan M, Sharif JU, Karim MR, Rahman MM, Ahmed H, Pandit H, Khan AU, Rahman MA, Talukder RK, Parveen R, Akhter H. Prevalence of GERD in Type II Diabetes Mellitus Patients Admitted in A Tertiary Care Hospital of Bangladesh. Mymensingh Med J 2017; 26:710-715. [PMID: 29208856] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Gastroesophageal reflux disease (GERD) is defined as symptoms or complications associated with regurgitation from the stomach and/or the duodenum to the esophagus. Patients with type II diabetes mellitus (DM) were known to have higher prevalence of GERD in the Western countries, but data on the impact of GERD on DM patients in our country are scarce. The aim of this cross-sectional study was to evaluate the presence of GERD in type II DM patients admitted at the Department of Medicine, Mymensingh Medical College Hospital, Mymensingh, Bangladesh from April 2015 to September 2015. A total of 137 type II DM cases were purposively collected. Reflux Disease Questionnaire (RDQ) was used to check the presence of GERD. Patient's characteristics, laboratory data, face-to-face interview data were analyzed. Out of 137 type 2 DM patients 108 were suffering from GERD giving a prevalence rate of 78.8% which is quite high. Pathophysiological factors like age, sex, duration of DM, weight, waist circumference (WC) had no significant difference between GERD-DM and non-GERD-type II DM patients. Only hypertension and frequent eating fatty food were found to have significant differences between the two groups. From the study findings it could be said that the higher rate of GERD in patients with type II DM may be associated with lifestyle factor and some pathophysiological factors like hypertension. Psychiatric factors may also play role in contributing GERD. Further in-depth and large scale studies are necessary in our country in this regard.
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Affiliation(s)
- M A Rouf
- Dr Mohammad Abdur Rouf, Assistant Professor, Department of Medicine, Mymensingh Medical College (MMC), Mymensingh, Bangladesh
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Islam MS, Uddin MZ, Ali MS, Islam MN, Rahman MH, Robi IH, Haque MM, Rahman MW, Uddin MA, Ahamed F, Malek MS, Kabir MA, Rahman MS, Khan AU, Doel FA. Modified Blatchford Score for Risk Stratification in Adult Patient with Nonvariceal Upper Gastrointestinal Haemorrhage and Their Short Term Hospital Outcome. Mymensingh Med J 2017; 26:490-497. [PMID: 28919600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Upper gastrointestinal hemorrhage (UGIH) is one of the most common and life-threatening gastrointestinal emergency. There are several risk scores for risk stratification in UGIB patients. The Modified Blatchford score, which relies only on clinical and laboratory parameters, is practical in the emergency setting The Modified Blatchford scoring system also known as Glasgow Blatchford Scoring (GBS) have been developed to stratify risk of non variceal upper gastrointestinal hemorrhage or need of medical or surgical intervention, endoscopic therapy. Objective of this study is to see risk stratification by The Modified Blatchford score and short term hospital outcome in non variceal upper GI hemorrhage patients. The observational study was carried out over a period of 6 months from October, 2014 to March, 2015 in Department of Department of Medicine, Gastroenterology and Surgery Mymensingh Medical College Hospital, Mymensingh. A total of 120 patients with non variceal UGIH were taken for the study during study period. Categorical variables were reported as percentage and Means and proportions were carried out using the Chi-square test (X2-test) of different variables by SPSS software version-18.0. Patients related variables age, sex; and main outcome variables the Modified Blatchford scoring system, Risk stratification, and short term hospital outcome were observed. Age frequency among total cases were 66(55%) <60 years, 50(41.67%) from 60-79 years and 4(3.3%) 80 years or above and sex distribution were 84(70%) were male and 36(30%) were female patients. Blatchford score of patients 1(0.83%) had score 0, 1(0.83%) had score 1, 2(1.67%) had score 2, 2(1.67%) had score 3, 2(1.67%) had score 4, 3(2.5%) had score 5, 12(10%) had score 6; 15(12.5%) had score 7, 16(13.33%) had score 8, 17(14.17%) had score 9, 16(13.33%) had score 10, 15(12.5%) had score 11, 10(8.33%) had score 12, 4(3.33% ) had score 13, 1(0.83%) had score 14, 2(1.67%) had score 15 and 1(0.83%) had score 16. Risk stratification showed 54(45%) had low risk (Mean GBS score 6.19±1.79), 66(55%) had high risk (Mean GBS score 11.03±1.83) Outcome of the patients were observed that 1(0.83%) died, 54(45%) was discharged without any medical or surgical intervention, and 65(54.17%) patients' needs medical or surgical intervention such as blood transfusion and endoscopy. Among total 120 patients with upper GI hemorrhage I have found that GBS score of three or less than three is predictive of low risk of adverse outcomes and can be discharged without any intervention.
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Affiliation(s)
- M S Islam
- Dr Md Saiful Islam, Medical Officer (Gastroenterology), Mymensingh Medical College Hospital (MMCH), Mymensingh
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Khan AU, Brož P, Premović M, Pavlů J, Vřeštál J, Yan X, Maccio D, Saccone A, Giester G, Rogl P. The Ti-Mn system revisited: experimental investigation and thermodynamic modelling. Phys Chem Chem Phys 2016; 18:23326-39. [PMID: 27498605 DOI: 10.1039/c6cp04542a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
As the Ti-Mn phase diagram is part of numerous ternary and higher order systems of technological importance, the present paper defines phase relations which have been experimentally established throughout this work from 800 °C to the melting range based on Differential Thermal Analyses (DTA), X-ray powder diffraction, metallography and Electron Probe Micro Analysis (EPMA) techniques on ∼50 alloys, which were prepared by arc melting or high frequency melting under high purity argon starting from freshly cleaned metal ingots. Novel compounds were identified and reaction isotherms were redefined accordingly. In the Ti-rich region a novel compound TiMn was detected, sandwiched between the known phases: TiMn1-x (∼45 at% Mn) and TiMn1+x (∼55 at% Mn). In the Mn-rich region the hitherto unknown crystal structure of TiMn∼3 was solved from X-ray single crystal diffraction data and found to be of a unique structure type Ti6(Ti1-xMnx)6Mn25 (x = 0.462; space group Pbam (#55); a = 0.79081(3) nm, b = 2.58557(9) nm, c = 0.47931(2) nm), which consists of two consecutive layers of the hexagonal MgZn2-type Laves phase (TiMn2) and a combined layer of alternate structure blocks of MgZn2 type and Zr4Al3 type. Whereas TiMn can be considered as a line compound (solubility range <∼1 at%), the homogeneity regions of the Ti-Mn compounds are significant (determined by EPMA): TiMn1-x (44.0 to 46.6 at% Mn), TiMn1+x (54.6 to 56.3 at% Mn), Ti1+xMn2-x (MgZn2-type, 59 to 69 at% Mn at 1000 °C: -0.08 < x < 0.23), TiMn∼3 (unique type; 74 to 76.5 at% Mn) and TiMn∼4 (R-phase: Ti8(TixMn1-x)6Mn39, 80 to 84 at% Ti). Supported by ab initio calculations of the ground state energy for the Laves phase, the new experimental results enabled thermodynamic modelling of the entire Ti-Mn phase diagram providing a complete and novel set of thermodynamic data thus providing a sound basis for future thermodynamic predictions of higher order Ti-Mn-X-Y systems.
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Affiliation(s)
- A U Khan
- Institute of Materials Chemistry and Research, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria.
| | - P Brož
- Masaryk University, Faculty of Science, Department of Chemistry, Kotlářská 2, 611 37, Brno, Czech Republic and Masaryk University, Central European Institute of Technology, CEITEC, Kamenice 753/5, 62500, Brno, Czech Republic
| | - M Premović
- Masaryk University, Faculty of Science, Department of Chemistry, Kotlářská 2, 611 37, Brno, Czech Republic
| | - J Pavlů
- Masaryk University, Faculty of Science, Department of Chemistry, Kotlářská 2, 611 37, Brno, Czech Republic and Masaryk University, Central European Institute of Technology, CEITEC, Kamenice 753/5, 62500, Brno, Czech Republic
| | - J Vřeštál
- Masaryk University, Faculty of Science, Department of Chemistry, Kotlářská 2, 611 37, Brno, Czech Republic and Masaryk University, Central European Institute of Technology, CEITEC, Kamenice 753/5, 62500, Brno, Czech Republic
| | - X Yan
- Institute of Materials Chemistry and Research, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria.
| | - D Maccio
- Dipartimento di Chimica e Chimica Industriale, Università di Genova, Sezione di Chimica Inorganica e Metallurgica, Via Dodecaneso 31, I-16146 Genova, Italy
| | - A Saccone
- Dipartimento di Chimica e Chimica Industriale, Università di Genova, Sezione di Chimica Inorganica e Metallurgica, Via Dodecaneso 31, I-16146 Genova, Italy
| | - G Giester
- Institute of Mineralogy and Crystallography, University of Vienna, Althanstraße 14, A-1090 Vienna, Austria
| | - P Rogl
- Institute of Materials Chemistry and Research, University of Vienna, Währingerstraße 42, A-1090 Vienna, Austria. and Christian Doppler Laboratory for Thermoelectricity, Vienna, Austria
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Bose B, Majumder S, Khan AU. Solid pseudopapillary tumour of pancreas. Mymensingh Med J 2014; 23:392-394. [PMID: 24858174] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Solid pseudopapillary tumour of pancreas (SPT) is an extremely rare pancreatic tumour, which has a low malignant potential and occurs mainly in young women. Pathologic and imaging findings include a well defined encapsulated pancreatic mass with cystic and solid components with evidence of haemorrhage. This is a case of a 16 years old girl who presented with upper abdominal pain of long duration and epigastric mass on palpation. Computed Tomography (CT) scan demonstrated a large well defined heterogenous attenuation mass of solid enhancing and cystic non enhancing areas, arising from the head of the pancreas. Radiologically it was diagnosed as a case of pancreatic neoplasm. Fine needle aspiration cytology (FNAC) and histopathology of the biopsy material diagnosed as solid pseudopapillary tumour of pancreas.
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Affiliation(s)
- B Bose
- Dr Banajaba Bose, Assistant Professor, Department of Radiology & Imaging, Shaheed Suhrawardy Medical College Hospital, Sher-E-Bangla Nagar, Dhaka, Bangladesh
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Khan NA, Khan AU, Hasan MI, Datta PK, Rahman MW, Akter M, Rahman S, Ferdous J, Miah AH, Sarker CB. Clinical profile of periodic paralysis. Mymensingh Med J 2012; 21:28-33. [PMID: 22314450] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
This cross sectional descriptive study was done to find out common clinical presentations, etiologies and laboratory investigation abnormalities in patients of periodic paralysis. Study was carried out in 30 patients with an age range from 8 to 70 years who were enrolled from July 2008 to June 2009 in Mymensingh Medical College Hospital (MMCH) medicine unit. Individuals who were admitted with sudden onset generalized muscle weakness, had history of previous attack and serum potassium level <3mmol/l or >5.5mmol/l were included in this study. In this series, majority of the patients were male (66.67%). Male: female ratio was approximately 2:1. The mean age of the patients was 27.4±4.5 years. Majority (26.67%) of them were in age range of 31-40 years. About 30% of the patients experienced the first attack of paralysis at the age of 20-24 years. Majority of patients (53%) were from middle class family with occupation of private service (26.66%) and farmer (20%). Positive family history was reported in 20% of patients. Regarding the precipitating factors, majority of patients (83.3%) were related to high carbohydrate meal, 56.67% related to temperature, 41.67% to exercise. Flaccid muscle weakness with variables muscle power (MRC grade 4/5 to 2/5 in 60% and 1/5 to 0/5 in 40%) was found. Cerebellar functions, all modalities of sensations and functions of cranial nerves were intact in all patients. In this series, laboratory investigations revealed reduced serum potassium level (<3mmol/l) in 90% of patients. Serum potassium value >5.5mmol/l was found in only 3.33% of patients. Creatine kinase (MM) was raised in 23% of the patients and Thyroid stimulating hormone (TSH) level was 0.8-2mmol/l in 6% of the patients. More than half of the patients (56%) showed variable ECG changes. Impaired nerve conduction function was found in 28.00%. So, careful history taking, meticulous clinical examination and simple laboratory investigations is sufficient to make a prompt diagnosis and rapid management of patients with periodic paralysis.
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Affiliation(s)
- N A Khan
- Department of Medicine, Mymensingh Medical College, Mymensingh, Bangladesh
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Akram M, Shakil S, Khan AU. Prevalence of integrons, blaCTX-M and blaTEM resistance markers among ESBL-producing uropathogenic Escherichia coli isolates: first report of genomic blaCTX-M from India. J Chemother 2011; 23:131-4. [PMID: 21742580 DOI: 10.1179/joc.2011.23.3.131] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Integrons have been observed to be frequently associated with uropathogenic bacteria. This study aimed at 1) determining the prevalence of class 1 integrons among ESBLl-producing uropathogenic Escherichia coli, and 2) analyzing resistance genes associated with different phylogenetic groups of the integron-positive isolates with special reference to bla(CTX-M) and bla(TEM). Twenty-three ESBL-producing E. coli were studied. Enterobacterial repetitive intergenic consensus-PCR (ERIC-PCR) displayed 14 major patterns. Pulse field Gel electrophoresis-typing of 8 randomly selected integron-positive strains ruled out any correlation between genotype and antibiotype. Genomic DNA from 14 strains was PCR-positive for class 1 integrons, bla(CTX-M-15) and bla(TEM-1)-like genes. Integron-sequencing revealed "aadA5-dfrA17-dfrA7" as the most prevalent gene cassette. Our findings unveil the increasing role of the bla(CTX-M) genes in antibiotic resistance and emphasize on the significance of appropriate empirical treatment for Urinary tract infections. Moreover, this is the first study which reports bla(CTX-M) located on genomic DNA of bacteria from India.
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Affiliation(s)
- M Akram
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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Abstract
The superoxide anion, O(2)-, evolves singlet molecular oxygen in dimethylsulfoxide solution. Pronounced water quenching of superoxide-sensitized luminescence is indicative of the preferential generation of the (1)sigma(g)+ state. Recent identification of O(2)- in the xanthine oxidase system suggests that the generation of singlet oxygen may also occur in enzymatic systems.
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Abstract
Four-level laser energy level schemes are compared from the mechanistic spectroscopic viewpoint: (i) noble-gas excimer, (ii) solution molecular excimer, (iii) conventional dye laser, and (iv) intramolecular proton transfer. The lasing action of the chlorophyll special pair is discussed as an example of a solution excimer laser, and the lasing action of 3-hydroxyflavone and other molecules is discussed as an example of an intramolecular proton-transfer laser.
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Affiliation(s)
- A U Khan
- Department of Chemistry and Institute of Molecular Biophysics, The Florida State University, Tallahassee, Florida 32306
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Khan AU, Gebauer P, Hager LP. Chloroperoxidase generation of singlet Delta molecular oxygen observed directly by spectroscopy in the 1- to 1.6-mum region. Proc Natl Acad Sci U S A 2010; 80:5195-7. [PMID: 16593358 PMCID: PMC384218 DOI: 10.1073/pnas.80.17.5195] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The (0,0) (1)Delta(g) --> (3)Sigma(-) (g) singlet molecular oxygen chemiluminescence emission from a biological reaction system, chloroperoxidase (EC 1.11.1.10) acting on hydrogen peroxide at low pH (phosphate buffer, pH 2.85) with Cl(-) as a cosubstrate, was recorded with an ultrasensitive IR spectrometer. The strong chemiluminescence emission peak observed at 1.30 mum provides clear evidence of the enzymatic generation of (excited) singlet oxygen from peroxide in this system.
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Affiliation(s)
- A U Khan
- Institute of Molecular Biophysics and Department of Chemistry, Florida State University, Tallahassee, Florida 32306
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Khan AU, Kasha M. Direct spectroscopic observation of singlet oxygen emission at 1268 nm excited by sensitizing dyes of biological interest in liquid solution. Proc Natl Acad Sci U S A 2010; 76:6047-9. [PMID: 16592729 PMCID: PMC411797 DOI: 10.1073/pnas.76.12.6047] [Citation(s) in RCA: 120] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The direct observation of dye-photosensitized 1268-nm emission of the (1)Delta(g) --> (3)Sigma(g) transition of molecular oxygen in liquid solution at room temperature is reported. Singlet oxygen was photosensitized by UV excitation of perfluorobenzophenone in fluorocarbon solvent, by 3,4-benzpyrene and hematoporphyrin in carbon tetrachloride, and by methylene blue in water. Also reported is the development of an extremely sensitive near-infrared spectrophotometer that uses a thermoelectrically cooled lead sulfide detector, optimized optics, and a boxcar integrator as a data processor.
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Affiliation(s)
- A U Khan
- Institute of Molecular Biophysics and Department of Chemistry, Florida State University, Tallahassee, Florida 32306
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Abstract
INTRODUCTION A temporary loop ileostomy is often created to minimize the impact of peritoneal sepsis if anastomotic dehiscence occurs following low colorectal anastomosis. Although it has been suggested that a loop ileostomy should be reversed within 12 weeks of formation, this is often not the case. We set out to analyse the use of loop ileostomy following elective anterior resection in England and to identify factors associated with non and delayed reversal. METHOD Hospital episode statistics for the years 2001-2006 were obtained from the Department of Health. Patients undergoing elective anterior resection with a loop ileostomy for a primary diagnosis of rectal or recto-sigmoid cancer between April 2001 and March 2003 were identified as the study cohort. This cohort was followed until March 2006 to identify patients undergoing reversal of an ileostomy in an English NHS Hospital. RESULTS A total of 6582 patients had an elective anterior resection between April 2001 and March 2003, of which 964 (14.6%) also had an ileostomy. Seven hundred and two (75.1%) patients were reversed before March 2006. Advancing age and comorbidity were statistically related to nonreversal. Median time to reversal was 207 days (Interquartile range 119-321.5 days). Postoperative chemotherapy and comorbidity significantly delayed reversal. CONCLUSIONS One in four loop ileostomies performed to defunction an elective anterior resection is not reversed, and in the presence of significant comorbidity one in three is not reversed. Only 12% is reversed within 12 weeks.
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Affiliation(s)
- G G David
- Leighton Research Unit, Department of General Surgery, Mid Cheshire Hospitals NHS Foundation Trust, Crewe, UK
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Shakil S, Ali SZ, Akram M, Ali SM, Khan AU. Risk factors for extended-spectrum beta-lactamase producing Escherichia coli and Klebsiella pneumoniae acquisition in a neonatal intensive care unit. J Trop Pediatr 2010; 56:90-6. [PMID: 19608665 DOI: 10.1093/tropej/fmp060] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
This study was made to find the prevalence of extended-spectrum beta-lactamase (ESBL)-producing Escherichia coli and Klebsiella pneumoniae in neonatal intensive care unit (NICU) and to identify the risk factors associated with the acquisition of these organisms. Risk factors associated with ESBL-producing E. coli and/or K. pneumoniae acquisition status of neonates were assessed. Of 253 neonates admitted, 238 entered the active surveillance system. ESBL-producing K. pneumoniae was responsible for 7 infections and 51 colonizations while ESBL-producing E. coli was responsible for 9 infections and 88 colonizations. Concurrent isolation of both the organisms occurred in 30 neonates. The logistic regression model identified 'length of stay in the NICU' as the single independent risk factor. Imipenem, cefepime and amikacin can be suggested as the drugs of choice in our study.
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Affiliation(s)
- S Shakil
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University Aligarh, India
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Abstract
Doripenem is a new 1-beta-methyl carbapenem with broad-spectrum activity against clinically important pathogens. Its activity matches imipenem or ertapenem against Gram-positive bacteria and meropenem against Gram-negative bacteria. It may offer slightly more activity than meropenem against selected pathogens. It does not require the addition of cilastatin. Doripenem is stable to hydrolysis by most of the beta-lactamases, excluding carbapenem-hydrolyzing beta-lactamases. We performed dockings of imipenem, meropenem, ertapenem and doripenem with imipenem-hydrolyzing beta-lactamase, Sme1, separately. Energy calculations revealed that the complex involving doripenem was much less stable. Hence doripenem resists attack by carbapenem-hydrolyzing beta-lactamases at least to some extent. Empiric therapy with doripenem may be useful in hospital settings where multidrug resistance has emerged. However, the proper place for this drug in current antibiotic prescribing practices needs to be determined.
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Affiliation(s)
- S Shakil
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, India
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Selvasekar CR, Obeidat S, Simcock P, Khan AU. Complete clinical and pathological response to preoperative short course radiotherapy in T 2 rectal cancer. Indian J Cancer 2009; 46:350-1. [PMID: 19749473 DOI: 10.4103/0019-509x.55563] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Selvasekar CR, David G, Corless DJ, Khan AU, Slavin JP. Rectal cancer surgery: is restoration of intestinal continuity the primary aim? Gut 2009; 58:311; author reply 311-2. [PMID: 19136525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/08/2022]
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Nwanze PI, Khan AU, Ameh JB, Umoh VJ. The effects of the interaction of various oil types and rates on the mycelial wet and dry weights of Lentinus squarrosulus (Mont.) Singer and Psathyrella atroumbonata Pegler in submerged liquid cultures. ACTA ACUST UNITED AC 2005. [DOI: 10.5897/ajb2005.000-3111] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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Khan AU, Ajamaluddin M, Ahmad M. A unique group of self-splicing introns in bacteriophage T4. Indian J Biochem Biophys 2001; 38:289-93. [PMID: 11886074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
We describe in this review, the salient splicing features of group I introns of bacteriophage T4 and propose, a hypothetical model to fit in the self-splicing of nrdB intron of T4 phage. Occurrence of non-coding sequences in prokaryotic cells is a rare event while it is common in eukaryotic cells, especially the higher eukaryotes. Therefore, T4 bacteriophage can serve as a good model system to study the evolutionary aspects of splicing of introns. Three genes of T4 phage were found to have stretches of non-coding sequences which belonged to the group IA type introns of self-splicing nature.
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Affiliation(s)
- A U Khan
- Interdisciplinary Biotechnology Unit, A M U Aligarh, India.
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Lightner D, Calvosa C, Andersen R, Klimberg I, Brito CG, Snyder J, Gleason D, Killion D, Macdonald J, Khan AU, Diokno A, Sirls LT, Saltzstein D. A new injectable bulking agent for treatment of stress urinary incontinence: results of a multicenter, randomized, controlled, double-blind study of Durasphere. Urology 2001; 58:12-5. [PMID: 11445471 DOI: 10.1016/s0090-4295(01)01148-7] [Citation(s) in RCA: 161] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
OBJECTIVES To assess the safety and effectiveness of Durasphere compared with bovine collagen in the treatment of stress urinary incontinence (SUI) due to intrinsic sphincter deficiency (ISD). METHODS This multicenter, randomized, controlled, double-blind trial was composed of 355 women diagnosed with SUI due to ISD and used a standardized pad test and the Stamey continence grade as the primary endpoints. The participants' ages ranged from 26 to 84 years. All patients had an abdominal leak point pressure of less than 90 cm H(2)O (average 51). RESULTS At 12 months after the first injection, the two materials were equivalent with respect to the improvement in continence grade and pad weight testing. Less Durasphere was injected to obtain comparable clinical results (Durasphere 4.83 mL versus bovine collagen 6.23 mL, P <0.001). When examined 1 year after the date of the last treatment, 49 (80.3%) of the 61 women treated with Durasphere showed improvement of 1 continence grade or more compared with 47 (69.1%) of 68 women treated with bovine collagen (P value for difference = 0.162). Although the adverse events reported for both groups were similar, the Durasphere group had an increased short-term risk of urgency and urinary retention. CONCLUSIONS The use of Durasphere for the treatment of SUI due to ISD was equally effective as bovine collagen and used less material. The U.S. Food and Drug Administration granted market approval for Durasphere on September 13, 1999. The product design and initial clinical data suggest the potential for greater durability of the clinical benefit, with the possibility of a permanent solution for SUI due to ISD in some patients.
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Khan AU. Evolutionary hypothesis of long-term memory. Med Hypotheses 2000; 54:954-8. [PMID: 10867746 DOI: 10.1054/mehy.1999.0993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Affiliation(s)
- A U Khan
- Psychiatry, University of California, San Francisco, Fresno 93703,
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Khan AU, Kovacic D, Kolbanovskiy A, Desai M, Frenkel K, Geacintov NE. The decomposition of peroxynitrite to nitroxyl anion (NO-) and singlet oxygen in aqueous solution. Proc Natl Acad Sci U S A 2000; 97:2984-9. [PMID: 10716721 PMCID: PMC16178 DOI: 10.1073/pnas.97.7.2984] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The mechanism of decomposition of peroxynitrite (OONO(-)) in aqueous sodium phosphate buffer solution at neutral pH was investigated. The OONO(-) was synthesized by directly reacting nitric oxide with superoxide anion at pH 13. The hypothesis was explored that OONO(-), after protonation at pH 7.0 to HOONO, decomposes into (1)O(2) and HNO according to a spin-conserved unimolecular mechanism. Small aliquots of the concentrated alkaline OONO(-) solution were added to a buffer solution (final pH 7.0-7.2), and the formation of (1)O(2) and NO(-) in high yields was observed. The (1)O(2) generated was trapped as the transannular peroxide (DPAO(2)) of 9, 10-diphenylanthracene (DPA) dissolved in carbon tetrachloride. The nitroxyl anion (NO-) formed from HNO (pKa 4.5) was trapped as nitrosylhemoglobin (HbNO) in an aqueous methemoglobin (MetHb) solution. In the presence of 25 mM sodium bicarbonate, which is known to accelerate the rate of decomposition of OONO(-), the amount of singlet oxygen trapped was reduced by a factor of approximately 2 whereas the yield of trapping of NO(-) by methemoglobin remained unaffected. Because NO(3)(-) is known to be the ultimate decomposition product of OONO(-), these results suggest that the nitrate anion is not formed by a direct isomerization of OONO(-), but by an indirect route originating from NO(-).
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Affiliation(s)
- A U Khan
- Department of Chemistry, New York University, New York, NY 10003, USA.
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Khan AU, Ahmad M, Lal SK. Restoration of mRNA splicing by a second-site intragenic suppressor in the T4 ribonucleotide reductase (small subunit) self-splicing intron. Biochem Biophys Res Commun 2000; 268:359-64. [PMID: 10679208 DOI: 10.1006/bbrc.2000.2144] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The nrdB gene of bacteriophage T4 codes for the small subunit of ribonucleotide reductase and contains a 598-base self-splicing intron which is closely related to other group I introns of T4 and eukaryotes. Thirty-one mutants causing splicing defects in the nrdB intron were isolated. Twenty-three EMS-induced revertants for these 31 primary mutants were isolated by the strategic usage of the white halo plaque phenotype. We mapped these revertants by marker rescue using subclones of the nrdB gene. Some of these second-site mutations mapped to regions currently predicted by the secondary structure model of the nrdB intron. One of these suppressor mutants (nrdB753R) was found to be intragenic by marker rescue with the whole nrdB gene. However, this mutation failed to map within the nrdB intron. Splicing assays showed that this pseudorevertant restored splicing proficiency of the nrdB primary mutation to almost wild-type conditions. This is the first example of a mutation within the exons of a gene containing a self-splicing intron that is capable of restoring a self-splicing defect caused by a primary mutation within the intron. In addition, two other suppressor mutations are of interest (nrdB429R and nrdB399R). These suppressors were able to restore their primary 5' defect but in turn create a 3' splicing defect. Both of these revertants mapped in different regions of the intron with respect to their primary mutations.
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Affiliation(s)
- A U Khan
- Interdisciplinary Biotechnology Unit, Aligarh Muslim University, Aligarh, 202002, India
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Tulpule A, Schiller G, Harvey-Buchanan LA, Lee M, Espina BM, Khan AU, Boswell W, Nathwani B, Levine AM. Cladribine in the treatment of advanced relapsed or refractory low and intermediate grade non-Hodgkin's lymphoma. Cancer 1998; 83:2370-6. [PMID: 9840537 DOI: 10.1002/(sici)1097-0142(19981201)83:11<2370::aid-cncr17>3.0.co;2-m] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND Cladribine (2-chlorodeoxyadenosine) is a purine nucleoside analog with cytotoxic activity against both resting and proliferating cells. Clinical studies with cladribine have reported antitumor activity against various hematologic malignancies. METHODS The authors studied responses to cladribine among patients with low and intermediate grade non-Hodgkin's lymphoma that had been refractory to or relapsed after prior chemotherapy. Cladribine was given intravenously over 2 hours at a dose of 0.14 mg/kg daily for 5 consecutive days, repeated every 4 weeks. RESULTS Twenty-eight patients (16 males, 12 females) with a median age of 58 years (range, 41-75 years) were accrued. Twenty-three patients had low grade and 5 had intermediate grade lymphoma. Stage IV disease was present in 22 (79%), and 17 (61%) had systemic B-symptoms. The majority (57%) had received 2 or more prior chemotherapy regimens (median, 2; range, 1-5); 6 had had prior fludarabine therapy. Major responses were documented in 32% (9 of 28 patients), with 4 complete remissions (CR) and 5 partial remissions (PR) after a median of 4 cycles (range, 1-9). One CR occurred in one patient with intermediate grade diffuse large cell lymphoma, and three of six patients who had had prior fludarabine therapy experienced CR or PR with cladribine. Severe hematologic toxicities included reversible neutropenia, protracted thrombocytopenia, and lymphopenia. Other reported adverse effects included mild-to-moderate fatigue, nausea, and diarrhea. CONCLUSIONS Cladribine is an active single agent in the treatment of patients with refractory or relapsed advanced stage indolent lymphoma, with major responses in one third of patients.
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Affiliation(s)
- A Tulpule
- University of Southern California Schools of Medicine, Radiology and Pathology, Los Angeles, USA
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Ghafoor F, Khan S, Suleman B, Khan AU. Evaluation of prostate specific antigen as a tumor marker in cancer prostate. J PAK MED ASSOC 1998; 48:360-3. [PMID: 10531768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
The present study was undertaken to evaluate the prostate specific antigen (PSA) alongwith other diagnostic methods as an application for a screening test, tumor marker and its relation to post surgical situation. The PSA has shown a sensitivity of 73.3% and specificity of 77.2%. The predictive value for positive PSA was 57% and for negative test was 66.6%. Local standards for PSA values in Pakistani community need to be established. The PSA test, inspite of its low specificity holds good promise for its contributory role as a tumor marker in prostate cancer.
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Affiliation(s)
- F Ghafoor
- Department of Urology, Shaikh Zayed Postgraduate Medical Institute, Lahore
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Khan AU, Lal SK, Ahmad M. Isolation and characterization of EMS induced splicing defective point mutations within the intron of the nrdB gene of bacteriophage T4. Biochem Biophys Res Commun 1998; 242:10-5. [PMID: 9439601 DOI: 10.1006/bbrc.1997.7553] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The nrdB gene of bacteriophage T4 codes for the small subunit of ribonucleotide reductase and contains a 598-base-pair self-splicing intron which is closely related to other group I introns of T4 and eukaryotes. The screening, isolation, and mapping of 31 nrdB intron mutations were conducted by the strategic usage of the white halo phenotype exhibited by T4 mutants defective in dyhydrofolate reductase or thymidylate synthase. These intron mutations cluster towards the ends, mainly the 3' end, and show a defect in self-splicing. These mutations map in regions of conserved structural elements, thus supporting secondary structure predictions. A distinct pattern of clustering is observed with the highest number of mutations mapping within three of the smaller regions (A, C, and D) of the nrdB intron and no mutations mapping in the largest (B) region. The highest density of mutations mapped in the smallest region (C) of the intron, containing only 96 bases, thus showing a distinct pattern of clustering within the catalytic core.
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Affiliation(s)
- A U Khan
- Department of Biochemistry, Faculty of Life Sciences, Aligarh Muslim University, India
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Khan AU. Quantitative generation of singlet (1 delta g) oxygen from acidified aqueous peroxynitrite produced by the reaction of nitric oxide and superoxide anion. J Biolumin Chemilumin 1995; 10:329-33. [PMID: 8588508 DOI: 10.1002/bio.1170100604] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Simple acidification of aqueous alkaline peroxynitrite quantitatively generates singlet (1 delta g) molecular oxygen, detected and quantitated spectroscopically (1270 nm). This observation provides a chemical basis for physiological cytotoxicity of ONOO- generated in the diffusion - controlled reaction of cellular NO. and O2-. The experiments consist of (i) chemical generation of ONOO- from NO. gas and KO2 powder in alkaline aqueous solution; (ii) absorption spectral identification of ONOO- in the near-UV with maximum at 301 nm; (iii) spectroscopic identification of 1O2 by its emission band at 1200-1340 nm with maximum at 1275 nm; and (i.v.) quantification of 1O2 generated in ONOO-/H+ reaction by comparison of the chemiluminescence intensity at 1270 nm with that from H2O2/OCI- reaction that generates 1O2 with unit efficiency at alkaline pH. 1O2 was generated with unit efficiency with respect to ONOO- concentration by the ONOO-/H+ reaction.
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Affiliation(s)
- A U Khan
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA
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46
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Abstract
Reactive oxygen species (ROSs) have recently been found to be important signaling molecules in several cellular responses. Individual species have characteristic reactive properties, yet are easily interconverted, making it difficult to identify the ROSs involved in each response.
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Affiliation(s)
- A U Khan
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138, USA
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Khan AU, Pandya K, Clifton MA. Near fatal gas embolism during laparoscopic cholecystectomy. Ann R Coll Surg Engl 1995; 77:67-8. [PMID: 7717649 PMCID: PMC2502512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
Abstract
Laparoscopic cholecystectomy has been greeted with enthusiasm by surgeons and patients alike. However, with the passage of time reports of complications related to this new approach are being published. We report an unusual complication of gas embolism in laparoscopic cholecystectomy. A high index of suspicion along with vigilant intraoperative monitoring will help in the early diagnosis and reduction of morbidity associated with gas embolism.
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Affiliation(s)
- A U Khan
- Department of General Surgery, Princess Alexandra Hospital, Harlow, Essex
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Abstract
Characteristic chemiluminescence emission of singlet (1 delta g) molecular oxygen at 1268 nm is reported from a Haber-Weiss reaction. The reaction consists of mixing aqueous hydrogen peroxide with a solution of potassium superoxide, solubilized by 18-crown-6 ether in carbon tetrachloride or in dry acetonitrile at room temperature. Since the discovery of the enzyme superoxide dismutase by J.M. McCord and I. Fridovich [(1968) J. Biol. Chem. 243, 5733-5760], the identity of the reactive oxidant in superoxide-generating systems in biology has remained a chemical mystery. The results presented here suggest strongly that the reactive species is singlet oxygen generated via the Haber-Weiss reaction and not, as usually assumed, the hydroxyl radical, .OH, generated by the same reaction.
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Affiliation(s)
- A U Khan
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138
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49
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Khan AU, Kasha M. Singlet molecular oxygen evolution upon simple acidification of aqueous hypochlorite: application to studies on the deleterious health effects of chlorinated drinking water. Proc Natl Acad Sci U S A 1994; 91:12362-4. [PMID: 7809041 PMCID: PMC45437 DOI: 10.1073/pnas.91.26.12362] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
A study of the pH profile of the decomposition of aqueous hypochlorite has revealed the evolution (onset at pH 8) of single (1 delta g) molecular oxygen (singlet spin state dioxygen) detected spectroscopically (1268 nm), prior to the appearance of chlorine (onset at pH 5.5). The possible mechanism of the singlet state dioxygen evolution is presented, and the origin of its chloride ion dependence is discussed, especially in reference to chloride ion dependence of singlet molecular oxygen evolution in biological systems. Recent epidemiological analyses of the correlation of human cancer with chlorinated water supplies focus attention on the singlet oxygen mechanisms of DNA lesion formation.
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Affiliation(s)
- A U Khan
- Department of Molecular and Cellular Biology, Harvard University, Cambridge, MA 02138
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50
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Abstract
We wished to assess whether the previously developed 3,3'-diaminobenzidine (DAB)-Mn++ cytochemical method, purportedly specific for superoxide localization, is detecting superoxide O2.- and/or the superoxide product, O2(1 delta g). We show here that polymorphonuclear leukocytes (PMNs) produce O2(1 delta g) extracellularly in response to non-phagocytic stimuli and that this production is inhibited by addition of superoxide dismutase, an enzyme typically used to demonstrate that a reaction is mediated by O2.-. Because O2(1 delta g) is highly reactive and can be generated from O2.-, the reactivity of a pure chemical source of O2(1 delta g) with the cytochemical probe DAB was examined in the presence and absence of Mn++. Reactions between DAB and O2(1 delta g), thermally released from 1,4-dimethyl-napthalene-1,4-endoperoxide (DNE), indicated that O2(1 delta g) directly reacted with DAB, forming an insoluble DAB polymer, and that this reaction was increased by the presence of Mn++. The direct reaction of O2(1 delta g) with DAB was confirmed using near-IR emission spectroscopy. The near-IR emission spectrum of DNE as it was warmed showed the characteristic energy emission peak of O2(1 delta g) and the intensity of this peak was reduced by the addition of DAB; kq = 1.7 x 10(8) M-1 sec-1. The requirement of Mn++ for oxidation of DAB by O2.- was reconfirmed using potassium superoxide as a pure chemical source of O2.-. In cell studies, however, DAB deposits were not observed in PMNs stimulated under conditions that lead to O2(1 delta g) production [e.g., 0.040 or 0.162 microM 4B-phorbol-12-myristate-13-acetate (PMA)], regardless of whether Mn++ was present in the cytochemical medium. Nor were DAB deposits found in cells stimulated with PMA in the absence of Mn++ or in unstimulated PMNs. Only cells incubated in cytochemical medium containing Mn++ and stimulated to produce large amounts of O2.- (e.g., 3.24 microM PMA) contained DAB deposits. In summary, the DAB-Mn++ cytochemical method remains an excellent method for localizing the production sites of O2.-, since the concentration of O2(1 delta g) within vesicles of stimulated cells is too low to directly oxidize DAB to an electron-dense deposit.
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Affiliation(s)
- M J Steinbeck
- Dept. of Pathology, Harvard Medical School, Boston, MA 02115
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