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1.
Sci Rep ; 8(1): 4455, 2018 03 13.
Article in English | MEDLINE | ID: mdl-29535412

ABSTRACT

14C is an important consideration within safety assessments for proposed geological disposal facilities for radioactive wastes, since it is capable of re-entering the biosphere through the generation of 14C bearing gases. The irradiation of graphite moderators in the UK gas-cooled nuclear power stations has led to the generation of a significant volume of 14C-containing intermediate level wastes. Some of this 14C is present as a carbonaceous deposit on channel wall surfaces. Within this study, the potential of biofilm growth upon irradiated and 13C doped graphite at alkaline pH was investigated. Complex biofilms were established on both active and simulant samples. High throughput sequencing showed the biofilms to be dominated by Alcaligenes sp at pH 9.5 and Dietzia sp at pH 11.0. Surface characterisation revealed that the biofilms were limited to growth upon the graphite surface with no penetration of the deeper porosity. Biofilm formation resulted in the generation of a low porosity surface layer without the removal or modification of the surface deposits or the release of the associated 14C/13C. Our results indicated that biofilm formation upon irradiated graphite is likely to occur at the pH values studied, without any additional release of the associated 14C.

2.
Ann R Coll Surg Engl ; 100(1): 37-41, 2018 Jan.
Article in English | MEDLINE | ID: mdl-29046093

ABSTRACT

Introduction Perianal fistulas are a common problem. Video-assisted anal fistula treatment is a new technique for the management of this difficult condition. We describe our initial experience with the technique to facilitate the treatment of established perianal fistulas. Methods We reviewed a prospectively maintained database relating to consecutive patients undergoing video-assisted anal fistula treatment in a single unit. Results Seventy-eight consecutive patients had their perianal fistulas treated with video-assistance from November 2014 to June 2016. Complete follow-up data were available in 74 patients, with median follow-up of 14 months (interquartile range 7-19 months). There were no complications and all patients were treated as day cases. Most patients had recurrent disease, with 57 (77%) having had previous fistula surgery. At follow-up, 60 (81%) patients reported themselves 'cured' (asymptomatic) including 5 patients with Crohn's disease and one who had undergone 10 previous surgical procedures. Logistical stepwise regression did not demonstrate any statistically significant factors that may have been considered to affect outcome (age, gender, diabetes, previous I&D, Crohn's disease, smoking, type of fistula). Conclusions Our data have shown that video-assisted anal fistula treatment is safe and effective in the management of perianal fistulas in our patients and this suggests it may be applied to all patients regardless of comorbidity, underlying pathology or type of fistula.


Subject(s)
Endoscopy, Gastrointestinal , Rectal Fistula/surgery , Video-Assisted Surgery , Endoscopy, Gastrointestinal/adverse effects , Endoscopy, Gastrointestinal/methods , Endoscopy, Gastrointestinal/statistics & numerical data , Female , Humans , Male , Prospective Studies , Video-Assisted Surgery/adverse effects , Video-Assisted Surgery/methods , Video-Assisted Surgery/statistics & numerical data
3.
Appl Environ Microbiol ; 83(6)2017 03 15.
Article in English | MEDLINE | ID: mdl-28087527

ABSTRACT

The survival of microorganisms within a cementitious geological disposal facility for radioactive wastes heavily depends on their ability to survive the calcium-dominated, hyperalkaline conditions resulting from the dissolution of the cementitious materials. The results from this study show that the formation of flocs, composed of a complex mixture of extracellular polymeric substances (EPS), provides protection against alkaline pH values up to 13.0. The flocs were dominated by Alishewanella and Dietzia spp., producing a mannose-rich carbohydrate fraction incorporating extracellular DNA, resulting in Ca2+ sequestration. EPS provided a ∼10-µm thick layer around the cells within the center of the flocs, which were capable of growth at pH values of 11.0 and 11.5, maintaining internal pH values of 10.4 and 10.7, respectively. Microorganisms survived at a pH of 12.0, where an internal floc pH of 11.6 was observed, as was a reduced associated biomass. We observed limited floc survival (<2 weeks) at a pH of 13.0. This study demonstrates that flocs maintain lower internal pHs in response to the hyperalkaline conditions expected to occur within a cementitious geological disposal facility for radioactive wastes and indicates that floc communities within such a facility can survive at pHs up to 12.0.IMPORTANCE The role of extracellular polymeric substances (EPS) in the survival of microorganisms in hyperalkaline conditions is poorly understood. Here, we present the taxonomy, morphology, and chemical characteristics of an EPS-based microbial floc, formed by a consortium isolated from an anthropogenic hyperalkaline site. Short-term (<2 weeks) survival of the flocs at a pH of 13 was observed, with indefinite survival observed at a pH of 12.0. Measurements from micro-pH electrodes (10-µm-diameter tip) demonstrated that flocs maintain lower internal pHs in response to hyperalkaline conditions (pH 11.0, 11.5, and 12.0), demonstrating that floc formation and EPS production are survival strategies under hyperalkaline conditions. The results indicate how microbial communities may survive and propagate within the hyperalkaline environment that is expected to prevail in a cementitious geological disposal facility for radioactive wastes; the results are also relevant to the wider extremophile community.


Subject(s)
Actinobacteria/metabolism , Alteromonadaceae/metabolism , Biofilms/growth & development , Radioactive Waste , Sewage/chemistry , Actinobacteria/isolation & purification , Alteromonadaceae/isolation & purification , Hydrogen-Ion Concentration , Polymers/metabolism , Waste Disposal, Fluid
4.
Ann R Coll Surg Engl ; 99(2): 134-136, 2017 Feb.
Article in English | MEDLINE | ID: mdl-27551895

ABSTRACT

INTRODUCTION Pilonidal abscess is a common surgical emergency. Conventional treatment with incision and drainage is associated with significant postoperative morbidity. We report our initial experience of using minimally invasive endoscopic technique for the treatment of pilonidal abscesses, referred to as endoscopic pilonidal abscess treatment (EPAT). MATERIALS AND METHODS A prospective database of all patients undergoing EPAT between January 2015 and March 2016 at Whiston Hospital was maintained. Data regarding patient demographics, peroperative variables and postoperative follow-up were recorded. RESULTS Nineteen patients were included, male to female ratio was 53 : 47 and median age of the cohort was 24 years (interquartile range 22-25 years). EPAT was the primary procedure for 10 patients and 9 had EPAT for recurrent pilonidal abscesses. There were no readmissions and none needed further surgery within 6 weeks of having the procedure. In all patients, complete wound healing was achieved within 6 weeks; all reported minimal postoperative pain (median postoperative visual analogue scale score 1) and immediate return to the activities of daily life. Four of the nineteen patients (21%) required definitive intervention for pilonidal disease in the follow-up period. CONCLUSIONS EPAT is a novel, minimally invasive technique for the treatment of acute pilonidal abscesses. It is safe, associated with reduced postoperative morbidity, recurrence rate and quick wound healing. Initial encouraging results require further investigations on a larger group of patients in a multicentre setting.


Subject(s)
Endoscopy/methods , Endoscopy/statistics & numerical data , Pilonidal Sinus/surgery , Adult , Endoscopy/adverse effects , Female , Humans , Male , Prospective Studies , Recurrence , Treatment Outcome , Wound Healing , Young Adult
5.
Vet World ; 9(8): 832-6, 2016 Aug.
Article in English | MEDLINE | ID: mdl-27651670

ABSTRACT

AIM: The present study was conducted to evaluate the performance of gray, brown, and white varieties of Japanese quail (Coturnix coturnix japonica) with respect to body weight, egg production, and egg quality traits in the coastal climatic condition of Odisha. MATERIALS AND METHODS: A total of 500-day-old straight run Japanese quail chicks of three varieties, viz., gray, brown, and white were randomly selected and reared in deep litter system at Central Poultry Development Organization, Eastern Region, Bhubaneswar. The weekly body weight of the birds was recorded till their egg production stage (up to 6 weeks of age). The average egg production was recorded every biweekly from 6(th) to 20(th) week. Exterior and interior quality of eggs from each variety was determined at 6 weeks of age. RESULTS: The initial average weekly body weight of three varieties did not differ (p>0.05) among the varieties. However, from 1(st) to 6(th) week significantly higher body weight was observed in gray than white and brown. Brown varieties had reached 50% egg production 1 week earlier than gray and white. Brown had higher peak hen day (HD) production or hen-housed egg production followed by white and gray. External quality such as: Egg weight, egg length, egg width, volume, shape index, shell weight, shell thickness depicted no significant difference among the varieties except circumference length and circumference width, which were significantly higher (p≤0.05) in gray varieties than brown varieties. Internal egg characteristics such as: Albumen length, albumen width, albumen height, albumen index, yolk length, yolk width, yolk height, yolk index, albumen weight, yolk weight, Haugh unit revealed no significance difference among the varieties. CONCLUSION: It may be summarized from the findings that gray excelled in body weight followed by white and brown. Egg production potential in terms of hen house egg production or HD egg production was higher for brown followed by white and gray in the coastal climatic condition of Odisha.

6.
J Am Chem Soc ; 138(36): 11896-906, 2016 09 14.
Article in English | MEDLINE | ID: mdl-27533277

ABSTRACT

Control of the spin degree of freedom of an electron has brought about a new era in spin-based applications, particularly spin-based electronics, with the potential to outperform the traditional charge-based semiconductor technology for data storage and information processing. However, the realization of functional spin-based devices for information processing remains elusive due to several fundamental challenges such as the low Curie temperature of group III-V and II-VI semiconductors (<200 K), and the low spin-injection efficiencies of existing III-V, II-VI, and transparent conductive oxide semiconductors in a multilayer device structure, which are caused by precipitation and migration of dopants from the host layer to the adjacent layers. Here, we use catalyst-assisted pulsed laser deposition to grow, for the first time, oxygen vacancy defect-rich, dopant-free ZrO2 nanostructures with high TC (700 K) and high magnetization (5.9 emu/g). The observed magnetization is significantly greater than both doped and defect-rich transparent conductive oxide nanomaterials reported to date. We also provide the first experimental evidence that it is the amounts and types of oxygen vacancy defects in, and not the phase of ZrO2 that control the ferromagnetic order in undoped ZrO2 nanostructures. To explain the origin of ferromagnetism in these ZrO2 nanostructures, we hypothesize a new defect-induced bound polaron model, which is generally applicable to other defect-rich, dopant-free transparent conductive oxide nanostructures. These results provide new insights into magnetic ordering in undoped dilute ferromagnetic semiconductor oxides and contribute to the design of exotic magnetic and novel multifunctional materials.

7.
J Environ Radioact ; 151 Pt 1: 311-320, 2016 Jan.
Article in English | MEDLINE | ID: mdl-26555366

ABSTRACT

The concentrations of total dissolved uranium (U), its isotopic composition ((234)U, (235)U, (238)U) and two long lived Ra isotopes ((226)Ra and (228)Ra) in alluvial aquifers of groundwater were determined to investigate the groundwater flow pattern in the south-western (SW) Punjab, India. Particular attention was given to the spatial variability of activity ratios (ARs) of (234)U/(238)U and (226)Ra/(228)Ra to predict the possible sources and supply process of U into the water from the solid phase. The measured groundwater (234)U/(238)U ARs were ∼1 or >1 in the shallow zone (depth < 30 m) with high U concentration and <1 in the deeper zone (depth > 30 m) with relatively low U concentration. The simultaneous elevated U concentration and (234)U/(238)U ARs in waters were possibly due to differences in imprints of rock-water interactions under hydrologic conditions. However, (234)U/(238)U ARs < 1 clearly indicate the lack of recharge from surface water to groundwater leading to (234)U deficit in groundwater. This deficit might be also attributed to alpha recoil processes under strong dissolution. Overall, the decreasing pattern of (234)U/(238)U ARs observed from SE to SW or NW ward clearly indicates a groundwater flow paths from SE to SW/NW. Similarly, (226)Ra/(238)U ARs < 1 for all water samples reflect that the precursor (238)U is fairly mobile relative to (226)Ra. This might be due to unusually high amount of (238)U in groundwaters and subsequently the different geochemistry of the two isotopes. On the other hand, (226)Ra/(228)Ra ARs in groundwaters varied widely and observed about 50-300 times higher than (238)U/(232)Th ARs in granitic rocks or soils. Such elevation in ARs might be attributed to different dissolution properties of their parents during water-rock interactions or lattice damage during decay or local enrichments of uranium in the aquifers.


Subject(s)
Groundwater/analysis , Radiation Monitoring , Radium/analysis , Uranium/analysis , Water Pollutants, Radioactive/analysis , India , Water Movements
9.
J Appl Microbiol ; 119(6): 1552-60, 2015 Dec.
Article in English | MEDLINE | ID: mdl-26451878

ABSTRACT

AIM: The aim of the study was to evaluate the ability of in vitro planktonic and immobilized cell models for determining the antimicrobial efficacy of common antimicrobial wound dressings. METHODS AND RESULTS: Five strains of Acinetobacter baumannii, Pseudomonas aeruginosa and methicillin resistant Staphylococcus aureus were tested against four antimicrobial wound dressings containing silver, honey or polyhexamethylene biguanide (PHMB), using both a planktonic and immobilized cell model. Across all species and models used, the nanocrystalline silver coated dressing demonstrated the best antimicrobial activity being as good if not better than all the other dressings. The planktonic cell model was less effective at differentiating the dressings on antimicrobial performance as the immobilized cell model indicating that a diffusion barrier had a significant impact on the performance of some dressings. In the presence of the diffusion barrier, antimicrobial impact of the Honey and PHMB dressings was significantly reduced, particularly in the case of A. baumannii. Activity was at least an order of magnitude lower in the immobilized cell model vs the planktonic cell model. CONCLUSIONS: The use of a planktonic cell model within standard tests may overestimate the efficacy of honey and PHMB. The use of an immobilized cell model provides a more demanding test for antimicrobial dressings allowing dressing to dressing and pathogen to pathogen differences to be more clearly quantified. SIGNIFICANCE AND IMPACT OF THE STUDY: The introduction of planktonic and immobilized cell models as part of testing regimens for wound dressings will provide a more thorough understanding of their antimicrobial and anti-biofilm properties.


Subject(s)
Anti-Bacterial Agents/pharmacology , Bacteria/drug effects , Bandages , Biofilms/drug effects , Cells, Immobilized/drug effects , Models, Biological
10.
FEMS Microbiol Ecol ; 91(8): fiv085, 2015 Aug.
Article in English | MEDLINE | ID: mdl-26195600

ABSTRACT

Anthropogenic hyperalkaline sites provide an environment that is analogous to proposed cementitious geological disposal facilities (GDF) for radioactive waste. Under anoxic, alkaline conditions cellulosic wastes will hydrolyze to a range of cellulose degradation products (CDP) dominated by isosaccharinic acids (ISA). In order to investigate the potential for microbial activity in a cementitious GDF, cellulose samples were incubated in the alkaline (∼pH 12), anaerobic zone of a lime kiln waste site. Following retrieval, these samples had undergone partial alkaline hydrolysis and were colonized by a Clostridia-dominated biofilm community, where hydrogenotrophic, alkaliphilic methanogens were also present. When these samples were used to establish an alkaline CDP fed microcosm, the community shifted away from Clostridia, methanogens became undetectable and a flocculate community dominated by Alishewanella sp. established. These flocs were composed of bacteria embedded in polysaccharides and proteins stabilized by extracellular DNA. This community was able to degrade all forms of ISA with >60% of the carbon flow being channelled into extracellular polymeric substance (EPS) production. This study demonstrated that alkaliphilic microbial communities can degrade the CDP associated with some radioactive waste disposal concepts at pH 11. These communities divert significant amounts of degradable carbon to EPS formation, suggesting that EPS has a central role in the protection of these communities from hyperalkaline conditions.


Subject(s)
Alteromonadaceae/metabolism , Archaea/metabolism , Biofilms , Cellulose/metabolism , Clostridium/metabolism , Microbial Consortia , Sugar Acids/metabolism , Alteromonadaceae/genetics , Anaerobiosis/physiology , Clostridium/genetics , Environment , Molecular Sequence Data , Radioactive Waste , Refuse Disposal
12.
Indian J Cancer ; 51 Suppl 1: S8-12, 2014 Dec.
Article in English | MEDLINE | ID: mdl-25526255

ABSTRACT

BACKGROUND: The role of fiscal policy, especially taxation, though has been proved to be an effective instrument of tobacco control, its application is limited in India due to several reasons. This paper examines the tax structure, price and affordability of SLT products in order to provide evidence on how to strengthen the role of fiscal policy in tobacco control. METHOD: Secondary data on tax structure and revenue from tobacco products were collected from the Ministry of Finance, Government of India. In order to measure the rise of prices corresponding to the increase in tax rate, the retail price index (RPI) and Whole Price Index (WPI) of SLT products were compared with the price index for all commodities for the period 2006-2012. The affordability of tobacco products is calculated by dividing prices of tobacco products by per capita income. RESULTS: During the last 6 years, the tax rate on SLT has gone up leading to a rise in the prices of SLT products more than the general price rise. However, the price rise is less than the per capita income growth indicating increasing affordability. The study observed a decline in the consumption of zarda and kahini due to the price increase during 2008-2013. However, the decline in the consumption of zarda is less compared with khaini due to a very low rise in its price. CONCLUSION: The prices should be raised more than the growth in income to influence consumption. Tax administration is a major challenge for SLT products and strengthening it could enhance revenue collection from SLT products.


Subject(s)
Public Health/legislation & jurisprudence , Smoking/legislation & jurisprudence , Taxes/legislation & jurisprudence , Tobacco Use Disorder/epidemiology , Tobacco, Smokeless/economics , Culture , Government Regulation , Humans , India , Public Health/economics , Smoking/economics , Tobacco, Smokeless/adverse effects
13.
Appl Radiat Isot ; 94: 200-205, 2014 Dec.
Article in English | MEDLINE | ID: mdl-25218462

ABSTRACT

Effects of high-dose neutron irradiation on chemical and optical properties of CR-39 were studied using FTIR (Fourier Transform Infrared) and UV-vis (Ultraviolet-Visible) spectroscopy. The primary goal was to find a correlation between the neutron dose and the corresponding changes in the optical and chemical properties of CR-39 resulted from the neutron irradiation. The neutrons were produced by bombarding a thick Be target with 22-MeV protons. In the FTIR spectra, prominent absorbance peaks were observed at 1735cm(-1) (C=O stretching), 1230cm(-1)(C-O-C stretching), and 783cm(-1)(=C-H bending), the intensities of which decreased with increasing neutron dose. The optical absorbance in the visible range increased linearly with the neutron dose. Empirical relations were established to estimate neutron doses from these optical properties. This technique is particularly useful in measuring high doses, where track analysis with an optical microscope is difficult because of track overlapping.


Subject(s)
Neutrons , Polyethylene Glycols/chemistry , Polyethylene Glycols/radiation effects , Radiometry/methods , Absorption, Radiation , Dose-Response Relationship, Drug , Radiation Dosage
14.
Br J Surg ; 99(7): 987-92, 2012 Jul.
Article in English | MEDLINE | ID: mdl-22517234

ABSTRACT

BACKGROUND: Low-grade appendiceal mucinous neoplasm (LAMN) is a precursor lesion for pseudomyxoma peritonei (PMP), which, if treated suboptimally, may later disseminate throughout the abdominal cavity. The role of cytoreductive surgery for these relatively early lesions is unclear. METHODS: Clinicopathological details and treatment outcomes of patients with a LAMN and disease limited to the appendix or immediate periappendiceal tissues, referred to a national treatment centre between 2002 and 2009, were evaluated prospectively. RESULTS: Of 379 patients with a diagnosis of PMP, 43 (median age 49 years) had LAMNs localized to the appendix and periappendiceal tissue. Thirty-two patients initially presented with symptoms of acute appendicitis or right iliac fossa pain. Two distinct lesions were identified: type I (disease confined to the appendiceal lumen) and type II (mucin and/or neoplastic epithelium in the appendiceal submucosa, wall and/or periappendiceal tissue, with or without perforation). Type I lesions were managed by a watch-and-wait surveillance policy with serial measurement of tumour markers and computed tomography in 14 of 16 patients. Seventeen of 27 patients with type II lesions underwent risk-reducing cytoreductive surgery and hyperthermic intraperitoneal chemotherapy with low morbidity. After a median follow-up of 40 months, there was no disease progression in either treatment pathway. CONCLUSION: This study identified two LAMN subtypes. Type II lesions have pathological features of increased risk for dissemination and should be considered for risk-reducing cytoreductive surgery.


Subject(s)
Adenocarcinoma, Mucinous/surgery , Appendiceal Neoplasms/surgery , Peritoneal Neoplasms/prevention & control , Pseudomyxoma Peritonei/prevention & control , Adenocarcinoma, Mucinous/classification , Adenocarcinoma, Mucinous/pathology , Adult , Aged , Aged, 80 and over , Appendiceal Neoplasms/classification , Appendiceal Neoplasms/pathology , Female , Humans , Male , Middle Aged , Prospective Studies , Watchful Waiting , Young Adult
15.
Dis Colon Rectum ; 52(10): 1705-14, 2009 Oct.
Article in English | MEDLINE | ID: mdl-19966601

ABSTRACT

PURPOSE: Treatment of peritoneal surface malignancies with combined cytoreductive surgery and heated intraperitoneal chemotherapy may improve oncologic outcome. To better define treatment pathways, five-year results in patients referred to one of two centralized national treatment centers in the United Kingdom were analyzed. METHODS: A prospective database of patients referred to the Manchester Peritoneal Tumor Service, established in 2002, was analyzed. Outcomes were evaluated using Kaplan-Meier life tables and Cox models. RESULTS: Two hundred seventy-eight patients (median age, 56.9 (range, 16-86) years) were considered by a dedicated multidisciplinary team and tracked on seven clinical pathways. Among the 118 surgically treated, the most common diagnosis was pseudomyxoma peritonei (101 patients, 86%). Major complications occurred in 11 patients (9%); there was no 30-day mortality. Where complete cytoreduction was achieved, three-year and five-year tumor-related survival rates were 94% and 86%, respectively. In the Cox model, incompleteness of cytoreduction (P = 0.001) and high-grade tumor (P < 0.0001) were independent prognosticators of poor outcome. CONCLUSION: The establishment of a national treatment center has allowed refinement of techniques to achieve internationally recognized results. Having achieved low levels of morbidity and mortality in the treatment of mainly pseudomyxoma peritonei of appendiceal origin, the technique of cytoreductive surgery and heated intraperitoneal chemotherapy may be considered for peritoneal carcinomatosis of colorectal origin.


Subject(s)
Peritoneal Neoplasms/drug therapy , Peritoneal Neoplasms/surgery , Pseudomyxoma Peritonei/drug therapy , Pseudomyxoma Peritonei/surgery , Adolescent , Adult , Aged , Aged, 80 and over , Combined Modality Therapy , Female , Humans , Life Tables , Male , Middle Aged , Peritoneal Neoplasms/epidemiology , Peritoneal Neoplasms/pathology , Prognosis , Proportional Hazards Models , Prospective Studies , Pseudomyxoma Peritonei/epidemiology , Pseudomyxoma Peritonei/pathology , Referral and Consultation/statistics & numerical data , Survival Rate , Treatment Outcome , United Kingdom/epidemiology
16.
J Nanosci Nanotechnol ; 8(8): 4068-72, 2008 Aug.
Article in English | MEDLINE | ID: mdl-19049177

ABSTRACT

Structural and magnetotransport properties of metallic Fe(x)Ag(y)Al(z) nanogranular thin films were studied. These films with several compositions were prepared by dc magnetron sputtering. X-ray diffraction (XRD) measurements carried out on the samples show only Ag(111) peaks. The d-spacings determined from the Ag(111) peaks are smaller than the standard value for bulk Ag indicating a partial substitution of Fe and Al atoms in Ag matrix. Transmission electron diffraction (TEM) patterns show a number of Ag rings. Both XRD and TEM studies did not reveal any diffraction peaks due to Fe or Al. The average particle size determined from the TEM micrograph is 5.9 nm. This value is in good agreement with the grain size determined from the XRD patterns for the Al substituted samples. The MR was found to increase for smaller Al concentration and it decreases with further increase in Al content. In the samples investigated magnetoresistance ratio reaches a maximum value of about 4.5% for the Fe27Ag63Al10 film.

17.
J Nanosci Nanotechnol ; 8(8): 4238-42, 2008 Aug.
Article in English | MEDLINE | ID: mdl-19049210

ABSTRACT

Several Fe(100-x)Pd(x0 thin films with x = 24-35 have been investigated to understand their structural, morphological and magnetic properties. The lattice spacing d111 obtained from the X-ray diffraction peaks shows a gradual increase with increasing x and this behaviour is attributed to the increasing substitution of Pd with larger atomic radius. While the atomic force microscopy images on selected samples showed surface roughness in the range 2-4 nm the scanning electron microscopy image of a Fe71Pd29 sample showed slightly dark and bright regions due to the large undulations of the surface of the films. We presume that these undulations are due to shape memory twin variants. In-plane magnetization measurements were carried out on selected films in applied magnetic fields up to 30 kOe. For three samples, the saturation magnetization is about 1300 emu/cc whereas for the Fe71Pd29 film it is about 950 emu/cc. The remanence ratio of the films is approximately in the range 50-70%. The behaviour of coercivity of our samples is believed to be due to grain size effect that generally plays a predominant role in thin films with nanometer size grains.

18.
Br J Cancer ; 99(4): 591-6, 2008 Aug 19.
Article in English | MEDLINE | ID: mdl-18682713

ABSTRACT

Pseudomyxoma peritonei (PMP) is a rare neoplastic process characterised by progressive intra-abdominal dissemination of mucinous tumour, and generally considered resistant to systemic chemotherapy. A phase II study in patients with advanced unresectable PMP was undertaken to evaluate the combination of systemic concurrent mitomycin C (7 mg m(-2) i.v. on day 1) and capecitabine (1250 mg m(-2) b.d. on days 1-14) in a 3-weekly cycle (MCap). Response was determined by semiquantitative assessment of disease volume on serial computed tomographic (CT) scans and serum tumour marker (CEA, CA125, CA19-9) changes at 12 weeks. Between 2003 and 2006, 40 patients were recruited through a national centre for the treatment of peritoneal surface tumours. At baseline, 23 patients had progressive disease and 17 had stable disease. Of 39 assessable patients, 15 (38%, 95% confidence intervals (CIs): 25, 54%) benefited from chemotherapy in the form of either reductions in mucinous deposition or stabilisation of progressive pretreatment disease determined on CT scan. Notably, two patients, originally considered unresectable, following MCap and re-staging underwent potentially curative cytoreductive surgery. Grade 3/4 toxicity rates were low (6%, 95% CIs: 4, 9%). Twenty out of 29 assessed patients (69%, 95% CIs: 51, 83%) felt that their Global Health Status improved during chemotherapy. This is the first trial to demonstrate an apparent benefit of systemic chemotherapy in patients with advanced unresectable PMP.


Subject(s)
Adenocarcinoma, Mucinous/drug therapy , Antineoplastic Combined Chemotherapy Protocols/therapeutic use , Peritoneal Neoplasms/drug therapy , Pseudomyxoma Peritonei/drug therapy , Adenocarcinoma, Mucinous/secondary , Adenocarcinoma, Mucinous/surgery , Adult , Aged , CA-125 Antigen/metabolism , CA-19-9 Antigen/metabolism , Capecitabine , Carcinoembryonic Antigen/metabolism , Deoxycytidine/administration & dosage , Deoxycytidine/analogs & derivatives , Female , Fluorouracil/administration & dosage , Fluorouracil/analogs & derivatives , Humans , Male , Middle Aged , Mitomycin/administration & dosage , Peritoneal Neoplasms/pathology , Peritoneal Neoplasms/surgery , Pseudomyxoma Peritonei/pathology , Pseudomyxoma Peritonei/surgery , Quality of Life , Survival Rate , Treatment Outcome
19.
J Nanosci Nanotechnol ; 8(6): 2964-70, 2008 Jun.
Article in English | MEDLINE | ID: mdl-18681032

ABSTRACT

Fe(x)Cu(y)Ag(z) granular thin films with several compositions were prepared by dc magnetron sputtering. These films consist of small Fe magnetic particles embedded in a nonmagnetic CuAg matrix. Structure, microstructure, morphology and magnetotransport properties were studied. The compositions of these samples were determined by energy-dispersive X-ray analysis. X-ray diffraction results showed strong Ag(111) peaks and broad Cu(111) peaks in all the samples. The variation of the (111) lattice spacings indicates a partial intermixing of Fe, Cu and Ag atoms. Microstructural studies using transmission electron microscopy (TEM) on a selected sample showed only Ag reflections and no reflection from Cu and Fe. Both XRD and TEM studies did not reveal any diffraction peak due to Fe and Cu for this sample. The fitting of the experimental grain size data obtained from TEM micrograph to the lognormal distribution function has allowed an estimation of the average grain diameter of 3.7 nm. The surface image of the Fe22Ag78 film observed using a scanning electron microscope showed the presence of droplet like Ag particles on the film surface. The Cu substitution results in smooth films without any Ag particles on the surface. Surface morphology by atomic force microscopy shows that the Fe39Cu13Ag48 film has a surface roughness of 0.75 nm. Finally, we have obtained a maximum giant magnetoresistance ratio of 3.2% in these films measured at 300 K for an in-plane magnetic field of 20 kOe.

20.
J Ethnopharmacol ; 115(1): 61-6, 2008 Jan 04.
Article in English | MEDLINE | ID: mdl-17983713

ABSTRACT

In present study, the hepatoprotective activity of ethanolic and aqueous extracts of Momordica dioica Roxb. leaves were evaluated against carbon tetrachloride (CCl4) induced hepatic damage in rats. The extracts at dose of 200mg/kg were administered orally once daily. The substantially elevated serum enzymatic levels of serum glutamate oxaloacetate transaminase (AST), serum glutamate pyruvate transaminase (ALT), serum alkaline phosphatase (SALP) and total bilirubin were restored towards normalization significantly by the extracts. Silymarin was used as standard reference and exhibited significant hepatoprotective activity against carbon tetrachloride induced haptotoxicity in rats. The biochemical observations were supplemented with histopathological examination of rat liver sections. The results of this study strongly indicate that Momordica dioica Roxb. leaves have potent hepatoprotective action against carbon tetrachloride induced hepatic damage in rats. Ethanolic extract was found more potent hepatoprotective. Meanwhile, in vivo antioxidant and free radical scavenging activities were also screened which were positive for both ethanolic and aqueous extracts. This study suggests that possible mechanism of this activity may be due to free radical-scavenging and antioxidant activities which may be due to the presence of flavonoids in the extracts.


Subject(s)
Antioxidants/pharmacology , Liver Diseases/prevention & control , Liver/drug effects , Momordica/chemistry , Plant Extracts/pharmacology , Alanine Transaminase/blood , Alkaline Phosphatase/blood , Animals , Antioxidants/chemistry , Antioxidants/isolation & purification , Aspartate Aminotransferases/blood , Bilirubin/metabolism , Carbon Tetrachloride , Chemical and Drug Induced Liver Injury , Female , Free Radical Scavengers/chemistry , Free Radical Scavengers/isolation & purification , Free Radical Scavengers/pharmacology , Liver/pathology , Male , Mice , Plant Extracts/chemistry , Plant Leaves , Rats , Rats, Wistar , Silymarin/pharmacology , Toxicity Tests, Acute
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