1
|
Patel A, Tiwari K, Asrani P, Alothaid H, Alahmari AFA, Mirdad R, Ajmal MR, Tarique M. Glutaredoxin proteins from E. coli isoforms were compared in terms of energy frustration. BRAZ J BIOL 2023; 83:e273091. [PMID: 37729314 DOI: 10.1590/1519-6984.273091] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2023] [Accepted: 06/05/2023] [Indexed: 09/22/2023] Open
Abstract
Glutaredoxin (GRXs) protein plays a vital role inside the cell, including redox control of transcription to the cell's antioxidant defense, apoptosis, and cellular differentiation regulation. In this study, we have investigated the energy landscape and characterized the pattern of local frustration in different forms and states of the GRX protein ofE. coli.Analysis was done on the conformational alterations, significant changes in the frustration pattern, and different GRXs such as GRX-II, GRX-III, GRX-II-GSH, and GRX-III-GSH complex. We have found the practice of frustration, and structure was quite similar in the same isoform having different states of protein; however, a significant difference was observed between different isoforms. Moreover, oxidation of GRX-I introduced an extra α-helix increasing the destabilizing interactions within the protein. The study of frustrated contacts on oxidized and reduced GRX and with bound and unbound Glutathione indicates its potential application in activating and regulating the behavior of GRXs.
Collapse
Affiliation(s)
- A Patel
- King Khalid University, College of Medicine, Department of Clinical Biochemistry, Abha, Kingdom of Saudi Arabia
| | - K Tiwari
- King Khalid University, College of Medicine, Department of Clinical Biochemistry, Abha, Kingdom of Saudi Arabia
- Amity University, Amity Institute of Microbial Biotechnology, Noida, UP, India
| | - P Asrani
- Amity University, Amity Institute of Microbial Biotechnology, Noida, UP, India
| | - H Alothaid
- Al Baha University, Faculty of Applied Medical Sciences, Department of Basic Medical Sciences, Al Baha, Al Baha Province, Saudi Arabia
| | - A F A Alahmari
- King Khalid University, College of Medicine, Department of Clinical Biochemistry, Abha, Saudi Arabia
| | - R Mirdad
- King Khalid University, Department of Surgery, Abha, Saudi Arabia
| | - M R Ajmal
- University of Tabuk, Faculty of Science, Biochemistry Department, Physical Biochemistry Research Laboratory, Tabuk, Saudi Arabia
| | - M Tarique
- Almanac Life Science India Private Limited, New Delhi, India
| |
Collapse
|
2
|
Panda S, Sehrawat A, Kayal S, Sundriyal D, Khanna M, Philips A, Jain D, Moharana L, Tiwari K, Kaaviya D, Cyriac S, Jose A, Saju S, Rathnam K, Ganesan P. 56P Clinico-pathological profile of adolescent and young adult colorectal cancer patients: Multicentre collaborative registry data from India. Ann Oncol 2022. [DOI: 10.1016/j.annonc.2022.10.088] [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: 12/05/2022] Open
|
3
|
Maharjan O, Bajracharya N, Dangal G, Karki A, Pradhan HK, Shrestha R, Bhattachan K, Tiwari K, Bharati S, Maharjan S. Misleading Diagnosis of Dysgerminoma in a Young Asymptomatic Patient. Kathmandu Univ Med J (KUMJ) 2020; 18:425-427. [PMID: 34165105] [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: 06/13/2023]
Abstract
Dysgerminomas account for approximately one third of all malignant ovarian germ cell tumors (tumors arising from ovarian germinal elements) and are the most common ovarian malignancy detected during pregnancy. They are the only germ cell malignancy with a significant rate of bilateral ovarian involvement that is 15-20 percent. They have a variable gross appearance, but in general are solid, pink to tan to cream colored lobulated masses. They have the best prognosis of all malignant ovarian germ cell tumor variants. Two thirds are stage I at diagnosis, and prognosis is excellent even for those with advanced disease due to exquisite tumor chemosensitivity. The 5 year disease specific survival rate approximates 99 percent. This is a case report of a huge ovarian dysgerminoma in a young unmarried lady that was quite asymptomatic. She underwent laparotomy with right ovarian cystectomy.
Collapse
Affiliation(s)
- O Maharjan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - N Bajracharya
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - G Dangal
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - A Karki
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - H K Pradhan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - R Shrestha
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - K Bhattachan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - K Tiwari
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - S Bharati
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - S Maharjan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| |
Collapse
|
4
|
Thakur SK, Dangal G, Karki A, Pradhan H, Shrestha R, Bhattachan K, Bajracharya N, Tiwari K, Bharati S, Maharjan O, Maharjan S. Pregnancy Complicated by Acute Pancreatitis with Ascariasis. Kathmandu Univ Med J (KUMJ) 2020; 18:324-326. [PMID: 34158446] [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: 06/13/2023]
Abstract
Ascariasis lumbricoides infections are common in tropical and sub-tropical countries. As it is one of the common causes for common bile duct obstruction. But in pregnancy is a rare entity. It may present with complications like acute pancreatitis. Here we present a case of 24 year female gravida 2 para 1 at 34 weeks of pregnancy presented with chief complain of pain over epigastric region radiating to back and associated with two episodes of vomiting, non bilious, not mixed with blood. Ultrasonography showed long tubular hyperechoic structure in gallbladder lumen most likely ascariasis and then she was diagnosed as a case of acute pancreatitis with alive ascariasis.
Collapse
Affiliation(s)
- S K Thakur
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - G Dangal
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - A Karki
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - H Pradhan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - R Shrestha
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - K Bhattachan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - N Bajracharya
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - K Tiwari
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - S Bharati
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - O Maharjan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| | - S Maharjan
- Department of Obstetrics and Gynecology, Kathmandu Model Hospital, Kathmandu, Nepal
| |
Collapse
|
5
|
Sekhsaria S, Jourdan A, Kim E, Mahajan A, Verma K, Tiwari K, Vij R. P006 ANTIBIOTIC HYPERSENSITIVITY MANAGEMENT AND IMPLICATIONS IN CLINICAL PRACTICE. Ann Allergy Asthma Immunol 2019. [DOI: 10.1016/j.anai.2019.08.235] [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: 11/15/2022]
|
6
|
Chikweto A, Veytsman S, Tiwari K, Cash K, Stratton G, Thomas D, Sharma RN. Prevalence of Cryptosporidium spp. in asymptomatic small ruminants in Grenada, West Indies. Vet Parasitol Reg Stud Reports 2019; 15:100262. [PMID: 30929939 DOI: 10.1016/j.vprsr.2019.100262] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Revised: 01/01/2019] [Accepted: 01/08/2019] [Indexed: 10/27/2022]
Abstract
Cryptosporidium spp. is a protozoan parasite that causes enteric infection in a wide range of hosts, including livestock and humans. The aim of this cross-sectional study was to estimate the prevalence of Cryptosporidium spp. in small ruminants in Grenada, West Indies. Fecal samples were collected from 100 sheep and 202 goats from 32 farms. The fecal samples were tested using an Enzyme-linked immunosorbent assay (ELISA) for qualitative detection of antigens in feces (Diagnostic Automation Inc., USA). The overall prevalence of Cryptosporidium spp. was 19.5% [95% confidence interval (CI): 15.4% to 24.4%] in both sheep and goats. The prevalence of Cryptosporidium spp. in sheep and goats was 14% (95% CI: 8.4% to 22.3%) and 22.3% (95% CI: 17.1% to 28.5%), respectively. There was no significant difference in the prevalence of Cryptosporidium spp. infection between sheep and goats (p = .42, Fisher's exact test) in Grenada. Of the 32 farms visited, 19 (59.4%) had at least one Cryptosporidium spp. positive animal.
Collapse
Affiliation(s)
- A Chikweto
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada.
| | - S Veytsman
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada
| | - K Tiwari
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada
| | - K Cash
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada
| | - G Stratton
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada
| | - D Thomas
- Ministry of Agriculture, Forestry, Fisheries and Environment, Ministerial Complex, Tanteen, St. Georges, Grenada
| | - R N Sharma
- Department of Pathobiology, School of Veterinary Medicine, St. George's University, St. George's, Grenada
| |
Collapse
|
7
|
Poudel R, Dangal G, Karki A, Pradhan H, Shrestha R, Bhattachan K, Bajracharya N, Tiwari K. Vesico-vaginal fistula post Right radical nephroureterectomy with bladder cuff excision. Nepal J Obstet Gynaecol 2018. [DOI: 10.3126/njog.v13i2.21893] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Case: 61 years, female presented at KMH OPD with involuntary urinary leakage per vaginum for seven months following Right radical nephreureterectomy with bladder cuff excision for urinary bladder carcinoma at other centre. Dye test was positive. Cystoscopy revealed VVF defect around 2 cm (Goh’s stage 3biii) at right posterior wall of urinary bladder. Ureteric catheter was placed in left ureter and VVF repair was done. Dye test following 14 days of Foley’s catheterization was negative and patient went home dry. We present here a case of successful repair of VVF following Right radical nephreureterectomy with bladder cuff excision.
Key words: dye test, Goh’s stage, pelvic surgeries, urinary tract injuries, vesico-vaginal fistula
Collapse
|
8
|
Priyadarshini P, Tiwari K, Das A, Kumar D, Mishra MN, Desikan P, Nath G. Evaluation of highly conserved hsp65-specific nested PCR primers for diagnosing Mycobacterium tuberculosis. Int J Tuberc Lung Dis 2018; 21:214-217. [PMID: 28234087 DOI: 10.5588/ijtld.16.0343] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE To evaluate the sensitivity and specificity of a new nested set of primers designed for the detection of Mycobacterium tuberculosis complex targeting a highly conserved heat shock protein gene (hsp65). DESIGN The nested primers were designed using multiple sequence alignment assuming the nucleotide sequence of the M. tuberculosis H37Rv hsp65 genome as base. Multidrug-resistant Mycobacterium species along with other non-mycobacterial and fungal species were included to evaluate the specificity of M. tuberculosis hsp65 gene-specific primers. RESULTS The sensitivity of the primers was determined using serial 10-fold dilutions, and was 100% as shown by the bands in the case of M. tuberculosis complex. None of the other non M. tuberculosis complex bacterial and fungal species yielded any band on nested polymerase chain reaction (PCR). The first round of amplification could amplify 0.3 ng of the template DNA, while nested PCR could detect 0.3 pg. CONCLUSION The present hsp65-specific primers have been observed to be sensitive, specific and cost-effective, without requiring interpretation of biochemical tests, real-time PCR, sequencing or high-performance liquid chromatography. These primer sets do not have the drawbacks associated with those protocols that target insertion sequence 6110, 16S rDNA, rpoB, recA and MPT 64.
Collapse
Affiliation(s)
- P Priyadarshini
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - K Tiwari
- Department of Microbiology, Bhopal Memorial Hospital and Research Centre, Bhopal, India
| | - A Das
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - D Kumar
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - M N Mishra
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| | - P Desikan
- Department of Microbiology, Bhopal Memorial Hospital and Research Centre, Bhopal, India
| | - G Nath
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, India
| |
Collapse
|
9
|
Tiwari K, Acuna AM, Guerrero A, Piechowski B, Thille K, Sharma R. Seroprevalence and pathology of lung worm Angiostrongylus cantonensis in brown rats (Rattus novergicus) from Grenada, West Indies. ACTA ACUST UNITED AC 2018. [DOI: 10.5958/0973-970x.2018.00006.8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
|
10
|
Tiwari K, Banerjee T, Filgona J, Anupurba S. Study of virulence factors in association with antimicrobial resistance amongst urinary isolates of enterococci. Indian J Med Microbiol 2015; 33:455-6. [PMID: 26068361 DOI: 10.4103/0255-0857.158602] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Affiliation(s)
| | | | | | - S Anupurba
- Department of Microbiology, Institute of Medical Sciences, Banaras Hindu University, Varanasi, Uttar Pradesh, India
| |
Collapse
|
11
|
Sharma R, Kimmitt T, Tiwari K, Chikweto A, Thomas D, Lanza Perea M, Bhaiyat MI. Serological evidence of antibodies to Neospora caninum in stray and owned Grenadian dogs. Trop Biomed 2015; 32:286-290. [PMID: 26691257] [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: 06/05/2023]
Abstract
Neospora caninum causes abortion in cattle and neuromuscular disease in dogs, world wide. Cattle become infected by ingesting oocysts voided by dogs. The aim of this study was to estimate the seroprevalence of Neospora caninum in two populations of dogs (stray and owned) in Grenada, West Indies. Sera were collected from 625 dogs from all parishes in Grenada. Three hundred and sixty eight dogs were stray, while 257 dogs were owned. Sera were tested for the presence of antibodies against N. caninum using an indirect enzyme linked immunosorbant assay (ELISA) IDvet, France. Antibodies to N. caninum were found in 6 (1.6%) (95% confidence interval (CI): 0.32% to 2.88%) of the stray dogs and in 3 (1.2%, 95% CI: 0.13% to 2.53%) of the owned dogs. Seroprevalence did not differ significantly between the two populations (p=0.74) and between the males and females (p=1). These results suggest that the prevalence of N. caninum infection in dogs in Grenada is low.
Collapse
Affiliation(s)
- R Sharma
- Department of Pathobiology, School of Veterinary Medicine, St George's University Grenada, West Indies
| | - T Kimmitt
- Department of Pathobiology, School of Veterinary Medicine, St George's University Grenada, West Indies
| | - K Tiwari
- Department of Pathobiology, School of Veterinary Medicine, St George's University Grenada, West Indies
| | - A Chikweto
- Department of Pathobiology, School of Veterinary Medicine, St George's University Grenada, West Indies
| | - D Thomas
- Veterinary and Livestock Division, Ministry of Agriculture, Land, Forestry, Fisheries and Environment, Government of Grenada
| | - M Lanza Perea
- Small Animal Clinic, School of Veterinary Medicine, St George's University Grenada, West Indies
| | - M I Bhaiyat
- Department of Pathobiology, School of Veterinary Medicine, St George's University Grenada, West Indies
| |
Collapse
|
12
|
Tiwari K, Raj VS, Upadhyay DJ, Gupta RK. In vitro activity of bioactive extracts from rare actinomycetes against multi-drug resistant Streptococcus pneumoniae. J Appl Microbiol 2015; 118:1306-14. [PMID: 25810118 DOI: 10.1111/jam.12810] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [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: 12/26/2014] [Revised: 03/10/2015] [Accepted: 03/17/2015] [Indexed: 11/30/2022]
Abstract
AIMS In this study, we investigated the in vitro potential of the bioactive extracts from five putatively novel species of actinomycetes isolated from the Indian hot desert against multi-drug resistant (MDR) Streptococcus pneumoniae. METHODS AND RESULTS The antimicrobial activity of 10 different extracts was evaluated against S. pneumoniae strains with, erm(B) and mef(E) genes as well as fluoroquinolone-resistant (FQ(R) ) strains using the micro-broth dilution method. Of these 10 extracts, four exhibited good to excellent anti-S. pneumoniae activity with minimum inhibitory concentrations (MICs) ranging from 0·125 to 8 μg ml(-1) . The time-kill kinetics study showed that these extracts killed the pathogens in 2-8 h. In vitro cell-free transcription/translation of luciferase gene using S30 bacterial extract and TNT mammalian ribosome indicated that they inhibited bacterial ribosomes at much lower concentrations than those required to inhibit the mammalian ribosomes. CONCLUSIONS This study demonstrates that these are potent concentration-dependent bactericidal metabolites with 16-fold higher in vitro activity than levofloxacin against MDR S. pneumoniae. SIGNIFICANCE AND IMPACT OF THE STUDY Metabolites from actinomycetes can be excellent inhibitors of MDR S. pneumoniae. Considering the in vitro efficacy of these crude extracts against S. pneumoniae MDR spp., once purified these can be used against streptococcal pathogens causing community-acquired pneumonia.
Collapse
Affiliation(s)
- K Tiwari
- School of Biotechnology, Guru Gobind Singh Indraprastha University, New Delhi, India
| | - V S Raj
- Centre for Drug Design, Discovery & Development (CD4), SRM University, Sonepat, India
| | - D J Upadhyay
- Department of Infectious Diseases, New Drug Discovery Research, Ranbaxy Research Laboratories, R & D III, Gurgaon, India
| | - R K Gupta
- School of Biotechnology, Guru Gobind Singh Indraprastha University, New Delhi, India
| |
Collapse
|
13
|
Singh VP, Singh S, Singh DP, Tiwari K, Mishra M. Synthesis, spectroscopic (electronic, IR, NMR and ESR) and theoretical studies of transition metal complexes with some unsymmetrical Schiff bases. J Mol Struct 2014. [DOI: 10.1016/j.molstruc.2013.10.046] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
14
|
Dubey J, Tiwari K, Chikweto A, DeAllie C, Sharma R, Thomas D, Choudhary S, Ferreira L, Oliveira S, Verma S, Kwok O, Su C. Isolation and RFLP genotyping of Toxoplasma gondii from the domestic dogs (Canis familiaris) from Grenada, West Indies revealed high genetic variability. Vet Parasitol 2013; 197:623-6. [DOI: 10.1016/j.vetpar.2013.07.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 07/16/2013] [Accepted: 07/20/2013] [Indexed: 02/04/2023]
|
15
|
Chikweto A, Tiwari K, Kumthekar S, Stone D, Louison B, Thomas D, Sharma R, Hariharan H. Serologic detection of antibodies to Brucella spp. using a commercial ELISA in cattle in Grenada, West Indies. Trop Biomed 2013; 30:277-280. [PMID: 23959493] [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: 06/02/2023]
Abstract
Bovine brucellosis, caused mainly by Brucella abortus, a zoonotic bacterium, has been reported from many areas of the world, including Central and South America, and the Caribbean island state of Trinidad and Tobago. Although brucellosis has been eradicated from domestic cattle in Canada it still exists in one or two herds in the United States. Serological tests are important in estimating prevalence of Brucella exposure in order to target eradication programmes. In this study, serum samples from 150 cattle were tested using a commercial competitive enzyme linked immunosorbent assay (SVANOVIR®Brucella-Ab C-ELISA) which detects antibodies to both B. abortus and Brucella melitensis. All cattle tested were greater than 6 months old and were unvaccinated. Sampled cattle were from 35 herds representing animals from all 6 parishes of Grenada. Nine of the 150 animals (6%) were positive for antibodies to B. abortus and/or melitensis by the C-ELISA. Of the 35 herds, 7 (20%) had C-ELISA- positive animals. Three of the 6 parishes contained positive herds. Based on the high sensitivity (98%) and specificity (99.7%) of the C-ELISA, these results strongly indicate the presence of cattle exposed to B. abortus and/or melitensis in Grenada.
Collapse
Affiliation(s)
- A Chikweto
- Pathobiology Academic Program, School of Veterinary Medicine, P.O Box 7, St. George's University, St. George's, Grenada, West Indies
| | | | | | | | | | | | | | | |
Collapse
|
16
|
Singh V, Singh S, Singh D, Singh P, Tiwari K, Mishra M, Butcher R. Synthesis, spectral and single crystal X-ray diffraction studies on Co(II), Ni(II), Cu(II) and Zn(II) complexes with o-amino acetophenone benzoyl hydrazone. Polyhedron 2013. [DOI: 10.1016/j.poly.2013.03.048] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
17
|
Kumari V, Banerjee T, Negi N, Gupta MI, Tiwari K, Gupta M. Human fascioliasis with biliary complications. J Commun Dis 2013; 45:91-93. [PMID: 25141559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We report a case of human fascioliasis adding to the few of the previously reported cases in India. A young boy from rural background in Bihar presented with diarrhea, vomiting, hepatic tenderness, jaundice and fever along with peripheral eosinophilia. Examination of stool revealed yellow-brown eggs of Fasciola hepatica. Human fascioliasis should be kept in mind in patients with cholangitis and eosinophilia especially in areas of sporadic occurrence.
Collapse
|
18
|
|
19
|
Chikweto A, Kumthekar S, Tiwari K, Nyack B, Deokar MS, Stratton G, Macpherson CNL, Sharma RN, Dubey JP. Seroprevalence of Toxoplasma gondii in Pigs, Sheep, Goats, and Cattle from Grenada and Carriacou, West Indies. J Parasitol 2011; 97:950-1. [DOI: 10.1645/ge-2811.1] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
20
|
Devkota A, Devkota B, Tiwari K. P2-385 Understanding prevalence, morbidities and factors associated with overweight/obesity among married women of Bhaktapur city, Nepal. Br J Soc Med 2011. [DOI: 10.1136/jech.2011.142976l.15] [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]
|
21
|
Prasad B, Srivastava S, Tiwari K, Sharma P. A new zwitterionic imprinted polymer sensor using ethylenediamine tetraacetic acid and chloranil precursors for the trace analysis of l-histidine. Materials Science and Engineering: C 2009. [DOI: 10.1016/j.msec.2009.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
22
|
Dolezal W, Tiwari K, Kemerait R, Kichler J, Sapp P, Pataky J. An Unusual Occurrence of Southern Rust, Caused by Rpp9-virulent Puccinia polysora, on Corn in Southwestern Georgia. Plant Dis 2009; 93:676. [PMID: 30764419 DOI: 10.1094/pdis-93-6-0676a] [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] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
Southern rust, caused by Puccinia polysora Underw., occurs frequently on corn (Zea mays) grown in subtropical or tropical regions. When conditions are favorable, southern rust also occurs in temperate climates of the central and southern United States although the fungus does not survive on corn crop residue and must be introduced to temperate regions each growing season. Several single, dominant, resistance genes, designated as Rpp genes, convey hypersensitive, chlorotic fleck reactions when challenged with avirulent isolates of P. polysora (1). Rpp resistance prevents or limits the formation of uredinia. The Rpp9 gene has been used successfully in North America in the past 20 years to control southern rust even though the gene has been ineffective in other parts of the world (e.g., Africa and Hawaii) because of the prevalence of virulent races. During the past 3 years, Rpp9 virulence has occurred in the western hemisphere (e.g., Brazil, Mexico, Nebraska, and Texas), but prior to 2008, uredinia were not observed east of the Mississippi River on corn with the Rpp9 gene. A few uredinia were observed on corn with the Rpp9 gene in eastern Nebraska in 2006 and near Victoria, TX in 2007 (W. Dolezal, personal observation). In July of 2008, a virulent isolate of P. polysora was confirmed from Grady County, GA on corn lines with the Rpp9 gene including the original source of this resistance gene, Boesman yellow flint, which is PI 186208 (3). In August of 2008, isolates of P. polysora were collected from severely infected corn hybrids with Rpp9 grown in Macon County, GA. Rust samples from hybrids without Rpp genes also were collected in Burke County, GA where Rpp-resistant corn was asymptomatic. In greenhouse trials, corn lines with and without the Rpp9 gene were inoculated with urediniospores from collections from Burke and Macon counties and Illinois. Rust infection types (1) were scored 18 to 25 days after inoculation. The Macon County isolate produced type 1 and 2 infections (small uredinia surrounded by necrotic or chlorotic tissue) on Oh43Rpp9 and W64aRpp9 and type 4 infections (large, sporulating uredinia) on two versions of a commercial hybrid with and without the Rpp9 gene and on Va59 (which carries an Rpp gene different from Rpp9). The Burke County isolate and an isolate from Illinois collected in 2001 produced type 0 infections (chlorotic flecks) on all of these lines except the non-Rpp version of the commercial hybrid which had a type 4 reaction. To our knowledge, Rpp9-virulent isolates of P. polysora have not been reported from the continental United States for nearly 50 years. In the late 1950s and early 1960s, A. L. Robert (2) collected isolates of P. polysora from throughout the world and observed multiple races on a set of host differentials that is no longer available. A. L. Robert's collection included an isolate from Georgia that was virulent on PI 186208. Commercial hybrids containing the Rpp9 gene may continue to be resistant throughout most of North America if previously common Rpp9-avirulent isolates of P. polysora are prevalent, but those hybrids should be carefully monitored for infection by newly introduced Rpp9-virulent isolates. References: (1) A. L. Hooker. Page 207 in: The Cereal Rusts. Vol. II. Academic Press, San Diego, 1985. (2) A. L. Robert. Phytopathology 52:1010, 1962. (3) A. J. Ullstrup. Phytopathology 55:425, 1965.
Collapse
Affiliation(s)
- W Dolezal
- Pioneer Hi-Bred International, Inc., Johnston, IA 50131
| | - K Tiwari
- Pioneer Hi-Bred International, Inc., Cairo, GA 39828
| | - R Kemerait
- University of Georgia, Department of Plant Pathology, Tifton 31793
| | - J Kichler
- University of Georgia, Cooperative Extension, Oglethorpe 31068
| | - P Sapp
- University of Georgia, Cooperative Extension, Waynesboro 30830
| | - J Pataky
- University of Illinois, Department of Crop Science, Urbana 61801
| |
Collapse
|
23
|
Abstract
The paper describes a theoretical analysis of the effects of unidirectional surface roughness on the response of a squeeze film between two porous rectangular plates of finite dimensions. The problem is solved analytically using Fourier expansions. It is shown that the nominal geometry as characterized by the aspect ratio of the plates has a profound effect on the system.
Collapse
Affiliation(s)
- J. Prakash
- Visiting Scientist (Alexander von Humboldt-Stiflung) Bundesanstalt foúr Materialprúfung, Unter den Eichen, 87, 1000 Berlin 45
| | - K. Tiwari
- Indian Institute of Technology, Bombay 400** 076
| |
Collapse
|
24
|
Péduzzi J, Barthélémy M, Tiwari K, Mattioni D, Labia R. Structural features related to hydrolytic activity against ceftazidime of plasmid-mediated SHV-type CAZ-5 beta-lactamase. Antimicrob Agents Chemother 1989; 33:2160-3. [PMID: 2694955 PMCID: PMC172844 DOI: 10.1128/aac.33.12.2160] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.0] [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: 01/02/2023] Open
Abstract
Tryptic peptides of the novel ceftazidimase CAZ-5 were sequenced by manual Edman degradation and aligned according to strong homology (more than 98%) with SHV-1 and SHV-2 beta-lactamase sequences. CAZ-5 differed from SHV-1 by five amino acid substitutions. Unusually high activity of CAZ-5 towards ceftazidime was imputed to substitution of a Lys for a Glu at position 214 of the mature protein.
Collapse
Affiliation(s)
- J Péduzzi
- Muséum National d'Histoire Naturelle, Centre National de la Recherche Scientifique Unité de Recherche Associée, Paris, France
| | | | | | | | | |
Collapse
|
25
|
Labia R, Morand A, Tiwari K, Sirot D, Chanal C. Interactions of meropenem, with beta-lactamases, including enzymes with extended-spectrum activity against third-generation cephalosporins. J Antimicrob Chemother 1989; 24 Suppl A:219-23. [PMID: 2808209 DOI: 10.1093/jac/24.suppl_a.219] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [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: 01/02/2023] Open
Abstract
The interactions of a meropenem were studied with a set of beta-lactamases including the new TEM- and SHV-related plasmid-mediated enzymes that have extended-spectrum activity against third-generation cephalosporins ('cefotaximases' and 'ceftazidimases'). Meropenem and imipenem were highly resistant to the hydrolytic activity of all the TEM and SHV related beta-lactamases, and to the OXA enzymes, as were the cephamycins: cefoxitin and cefotetan. The two carbapenems were also highly stable to Class C beta-lactamases (chromosomal cephalosporinases) whereas third-generation cephalosporins and cephamycins were slowly hydrolyzed. Both carbapenems demonstrated quite similar affinities for all the enzymes studied. In some instances, and particularly with Class A (TEM- and SHV-derived) enzymes, meropenem inactivated the beta-lactamase activity. Imipenem appeared less reactive in this respect.
Collapse
Affiliation(s)
- R Labia
- Muséum National d'Histoire Naturelle, CNRS, Paris, France
| | | | | | | | | |
Collapse
|
26
|
Labia R, Tiwari K, Morand A, Mattioni D, Yaghlane HB, Redjeb SB, Boujenah A. Comparison of hydrolytic properties of SHV-2 and SHV-1 beta-lactamases, particularly concerning third-generation cephalosporins. J Chemother 1989; 1:329-30. [PMID: 16312425] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Affiliation(s)
- R Labia
- Museum National d'Histoire Naturelle, UA 401 CNRS, Paris, France
| | | | | | | | | | | | | |
Collapse
|
27
|
Labia R, Barthélémy M, Peduzzi J, Morand A, Tiwari K. [Behavior of ceftazidime in regard to different classes of beta-lactamases. The situation in 1988]. Presse Med 1988; 17:1890-4. [PMID: 2973579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Following Ambler's observations, B-lactamases can be divided in four classes, probably derived from a very small number of ancestral genes. Class A includes the TEM-type beta-lactamases (TEM-1, TEM-2), PIT-2/SHV-1 and others which do not hydrolyse ceftazidime and other third-generation cephalosporins. The new plasmid-mediated beta-lactamases markedly active against third-generation cephalosporins also belong to class A and the primary structures of few of them are known. All the class A beta-lactamases are highly susceptible to the action of beta-lactamase inhibitors: clavulanic acid, sulbactam, YTR-830, and are devoid of any hydrolytic properties for cephamycins and imipenem. Third-generation cephalosporins are slowly hydrolyzed by the class C beta-lactamases: the inducible cephalosporinases. Thus only organisms which produce derepressed cephalosporinases are resistant to third-generation cephalosporins, but individual variations are known.
Collapse
Affiliation(s)
- R Labia
- Muséum National d'Histoire Naturelle, UA 401 CNRS, Paris
| | | | | | | | | |
Collapse
|
28
|
Labia R, Morand A, Tiwari K, Sirot J, Sirot D, Petit A. Interactions of new plasmid-mediated beta-lactamases with third-generation cephalosporins. Rev Infect Dis 1988; 10:885-91. [PMID: 3055180 DOI: 10.1093/clinids/10.4.885] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
The kinetic constants of three recently identified plasmid-mediated beta-lactamases--SHV-2, CTX-1, and CAZ-1--markedly active against third-generation cephalosporins were analyzed in comparison with three better-characterized beta-lactamases--two plasmid-mediated enzymes, TEM-2 and PIT-2/SHV-1, and R-30, a beta-lactamase from Klebsiella oxytoca that has few similarities to the newer enzymes. All of these enzymes are synthesized constitutively, demonstrate efficient hydrolysis of penicillins, are highly susceptible to the action of clavulanic acid and sulbactam, and have no detectable activity against the cephamycins and imipenem. With the methoxyimino cephalosporins, including those of the third generation, the rates of hydrolysis observed for the SHV-2, CTX-1, and CAZ-1 enzymes are high and show no relation to those observed for the other presently known beta-lactamases. Structure-activity relations suggest that the oxime substituent of these cephalosporins is a major structural factor in the catalytic process observed with the three new beta-lactamases.
Collapse
Affiliation(s)
- R Labia
- Muséum National d'Histoire Naturelle, Paris, France
| | | | | | | | | | | |
Collapse
|
29
|
Labia R, Morand A, Tiwari K, Pitton JS, Sirot D, Sirot J. Kinetic properties of two plasmid-mediated beta-lactamases from Klebsiella pneumoniae with strong activity against third-generation cephalosporins. J Antimicrob Chemother 1988; 21:301-7. [PMID: 3283096 DOI: 10.1093/jac/21.3.301] [Citation(s) in RCA: 22] [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: 01/05/2023] Open
Abstract
We determined the kinetic constants for two plasmid-mediated beta-lactamases with strong activity against third-generation cephalosporins: CTX-1 and SHV-2. The enzymes had many similar properties: their synthesis was constitutive and they were significantly active against penicillins as well as cephalosporins. The two enzymes thus differed considerably from the chromosomal cephalosporinases, but bore some resemblance to the commonly-encountered plasmid-coded penicillinases, such as TEM beta-lactamases. Moreover, like the TEM enzymes, the plasmid-mediated CTX-1 and SHV-2 enzymes were highly sensitive to the action of the inhibitors clavulanic acid and sulbactam. These inhibitors protected cefotaxime from hydrolysis by these enzymes. Both CTX-1 and SHV-2 lacked activity against the cephamycins, cefoxitin, latamoxef (moxalactam) and cefotetan. The CTX-1 and SHV-2 enzymes had a low activity against oxacillin and were not sensitive to chloride ions. Thus, they were not related to the OXA type beta-lactamases. For the third-generation cephalosporins the rates of hydrolysis were high and thus bore no relation with those observed for the other presently-known beta-lactamases, with perhaps the exceptions of those produced by K. oxytoca. Imipenem was very resistant to the action of these CTX-1 and SHV-2 beta-lactamases.
Collapse
Affiliation(s)
- R Labia
- Muséum National d'Histoire Naturelle, UA 401 CNRS, Paris, France
| | | | | | | | | | | |
Collapse
|
30
|
Behere PB, Tiwari K, Behere M. Changing diagnosis in psychiatry. Indian J Psychiatry 1988; 30:73-7. [PMID: 21927286 PMCID: PMC3010816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The present study was conducted to find out changes in the diagnosis of hospitalized patients. Out of 421 hospitalized psychiatric patients from 1974 to 1976, the diagnosis was changed in 54 (12.8%) patients. The change in diagnosis occured once in 51 and twice in 3 cases. Finally reasons for change and its implementations are discussed.
Collapse
Affiliation(s)
- P B Behere
- Reader, Department of Psychiatry Institute of Medical Sciences Banaras Hindu University, Varanasi - 221005
| | | | | |
Collapse
|
31
|
Behere PB, Tiwari K. Stability of psychiatric diagnosis. Indian J Psychiatry 1985; 27:173. [PMID: 21927098 PMCID: PMC3011153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
Affiliation(s)
- P B Behere
- Dept. of Psychiatry, Institute of Medical Sciences, Banaras Hindu University, Varanasi-221005
| | | |
Collapse
|
32
|
Tiwari K. Titrimetric microdetermination of certain sulphur-containing organic compounds by oxidation with alkaline potassium permanganate. Talanta 1983; 30:440-2. [DOI: 10.1016/0039-9140(83)80103-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/1982] [Revised: 11/29/1982] [Accepted: 12/23/1982] [Indexed: 11/16/2022]
|
33
|
Abstract
The paper considers the surface roughness effects in hydrodynamic porous bearings. On the basis of stochastic theory of hydrodynamic lubrication of rough surfaces developed by Christensen, different forms of Reynolds type equations, as applicable to a general porous bearings are derived for various types of surface roughness pattern. To illustrate the functional effects of surface roughness on the operating characteristics of a porous bearing, the case of nonrotating circular plates in normal approach is analyzed. It is shown that surface roughness may considerably influence the operating characteristics of porous bearings. The direction of the influence, however, depends upon the type of roughness assumed.
Collapse
Affiliation(s)
- J. Prakash
- Department of Mathematics, Indian Institute of Technology, Powai, Bombay 400 076, India
| | - K. Tiwari
- Department of Mathematics, Indian Institute of Technology, Powai, Bombay 400 076, India
| |
Collapse
|
34
|
Mathur DR, Mathur A, Tiwari K, Vyas MC, Joshi KR. Ectopic endometriosis in peritoneum with tuberculosis. J Indian Med Assoc 1981; 77:9-10. [PMID: 7328327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
|
35
|
Dabke V, Tiwari K, Agarwal S. Mixed germ cell tumour of ovary--a case report. Indian J Cancer 1974; 11:368-72. [PMID: 4442927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
36
|
Gulati B, Gupta SS, Alvi N, Tiwari K. Infertility and sterility in relation to histamine content of endometrium. Indian J Med Res 1971; 59:1172-5. [PMID: 5161561] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023] Open
|