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Surgery in the Elderly, Counting the Cost and Rising to the Challenge: A review
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Singh, K

; Hariharan, S

West Indian Medical Journal

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2018, Volume 67 Nº spe Páginas 488 - 492

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

ABSTRACT Increasing life-expectancy globally and in the Caribbean region has led to an increased proportion of the population being categorized as elderly. The ageing population frequently require elective and emergency surgical procedures often with considerable morbidity and mortality. The amount of strain this paradigm can cause in any healthcare system is a huge challenge for the coming generations. In the Caribbean Islands, these challenges are compounded by several unique factors. This article reviews the impact of ageing upon surgery and associated specialties including anaesthesia and intensive care, with special reference to the Caribbean healthcare sector and attempts to provide some suggestions to mitigate such challenges in the near future.

RESUMEN El aumento de la expectativa de vida tanto a nivel mundial como en la región del Caribe ha llevado a una mayor proporción de la población en la categoría de ancianos. La población en proceso de envejecimiento frecuentemente requiere procedimientos quirúrgicos electivos y de emergencia, acompañados a menudo de considerable morbilidad y mortalidad. La tremenda tensión que este paradigma puede causar en cualquier sistema de salud representa un desafío enorme para las generaciones venideras. En las islas del Caribe, estos desafíos se agravan por varios factores únicos. Este artículo examina el impacto del envejecimiento en la cirugía y las especialidades asociadas incluyendo anestesia y cuidados intensivos, con especial referencia al sector de la salud del Caribe, a la par que persigue brindar algunas sugerencias para mitigar estos desafíos en un futuro cercano.

https://doi.org/10.7727/wimj.2018.186

Waiting times for prostate cancer diagnosis in KwaZulu-Natal, South Africa
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Singh, K

; Abdel Goad, E H

; Ramklass, S S

SAMJ: South African Medical Journal

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Jun 2015, Volume 105 Nº 6 Páginas 484 - 486

Resumo: En | Texto: En | PDF: En

BACKGROUND: There is currently no evidence in the South African (SA) literature to suggest how long patients with clinically suspected prostate cancer (an elevated prostate-specific antigen level or abnormal findings on digital rectal examination) wait to have a prostate biopsy. OBJECTIVES: To improve the overall efficiency of the prostate biopsy service offered at St Aidan's Regional Hospital, Durban, SA, by quantifying the burden of disease and waiting times and to identify potential delays in management outcomes, thereby helping to alleviate patient anxiety during the stressful period of investigation. METHODS: We did a retrospective folder review of patients who underwent trans-rectal prostate biopsy at St Aidan's Hospital, where the vast majority of prostate biopsies in the KwaZulu-Natal state healthcare sector are performed, from January to June 2013. The Statistical Package for Social Sciences was used for data analysis. RESULTS: One hundred and six patients (mean age 67.6 years, 69.8% black Africans) underwent biopsy during the 6-month study period; 49.1% were found to have adenocarcinoma, and of the 80.1% of these who had a bone scan, 73.8% had skeletal metastases (p=0.1379). The median period of time from referral to biopsy was 55 days, from referral to first follow-up date (when the diagnosis is given and treatment options discussed or instituted) 100 days, and from biopsy to first follow-up date (i.e. waiting period to retrieve histological diagnosis) 36 days. CONCLUSION: Despite the late presentation of prostate cancer in KZN, patients are waiting an average of 3 months from initial referral for a prostate biopsy to institution of definitive management.

https://doi.org/10.7196/SAMJ.9192 854 downloads

Design of a novel dual: band planar inverted F - antenna for mobile radio applications
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Chattoraj, N.

; Qurratulain,

; Saxena, J.

; Agarwal, S.

; Singh, K. V.

Journal of Microwaves, Optoelectronics and Electromagnetic Applications

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Dez 2014, Volume 13 Nº 2 Páginas 177 - 184

Resumo: En | Texto: En | PDF: En

The design of a novel compact dual band PIFA (Planar Inverted F-Antenna) as an embedded antenna is reported in this paper for mobile radio applications. The new shorted planar antenna is realized using copper sheet of thickness 1mm and air as the dielectric substrate. The radiating patch consists of a branch line slit to reduce the size of the antenna having a ground size of 36 x 80 mm2. It can be used in internal mobile antennas for applications in GSM band, GCV (1.85 - 1.99GHz), PCS - 1900, IMT-2000 and UMTS 2100 networks. The simulations are done using the Ansoft High Frequency Structure Simulator (HFSS) software tool. The two operating frequency ranges obtained have good matching and radiation characteristics. The simulated results are well supported by measured results of the prototype of the antenna fabricated.

7649 downloads

Approaches to prepare tfc polyamide membranes by coating diamine during, and/or post formation of asymmetric membranes and their performances
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Joshi, R. N

; Singh, K

; Bhattacharya, A

Brazilian Journal of Chemical Engineering

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Set 2011, Volume 28 Nº 3 Páginas 457 - 465

Resumo: En | Texto: En | PDF: En

Thin film composite membranes were prepared by using1,3 - phenylene diamine in the gelation bath as well as in coating conditions. The cross - sectional view of the membranes shows different patterns for membranes prepared in a water - bath (Mem - I) and a diamine - containing water bath (Mem - II). The thin film composite membranes prepared using a diamine bath and coating (Mem - III) had improved salt rejecting ability but low volume flux. The performances of the salt rejection follows the order Na2SO4 > NaCl > MgSO4> MgCl2, as expected. The salt separation performances of the membranes made with higher concentration of 1,3 phenylene diamine follow the order Mem - IIIb > Mem - I > Mem - IIb. For membranes made with low concentration of 1,3 - phenylene diamine, the salt separation follows the same trend, (Mem - IIIa > Mem - IIa).

5725 downloads Citado 1 vez em SciELO

Electrochemical Behavior of Mild Steel in Dimethyl Sulfoxide Containing Hydrochloric Acid
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Rastogi, R.B.

; Singh, M.M.

; Singh, K.

; Maurya, J.L.

Portugaliae Electrochimica Acta

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2010, Volume 28 Nº 6 Páginas 359 - 371

Resumo: En | Texto: En | PDF: En

The corrosion behavior of mild steel in dimethyl sulfoxide containing various concentrations, i.e., 0.001, 0.005, 0.010, 0.015 and 0.020 M of hydrochloric acid has been studied in presence of 0.1 M tetra ethyl ammonium chloride as supporting electrolyte by applying electrochemical techniques. The results of these experiments have been supplemented by surface analysis of the samples exposed to corrosive solution under different experimental conditions. The electrochemical investigation was done potentiostatically by varying the concentration of HCl in DMSO and the experimental temperature as well.

721 downloads

Porometry Studies of the Polysulfone Membranes on Addition of Poly(ethylene Glycol) in Gelation Bath During Preparation
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Yogesh, S. Javiya

; Gupta, S.

; Singh, K.

; Bhattacharya, A.

Journal of the Mexican Chemical Society

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Jun 2008, Volume 52 Nº 2 Páginas 140 - 144

Resumo: En Es | Texto: En Es | PDF: En | PDF: Es

Polysulfone membranes are prepared through phase separation technique, introduced by Loeb-Sourirajan. The viscous polymer solution (in dimethyl formamide) is first spread into the thin film, and then immersed in gelation medium (water). The influence of polymeric additive, (poly(ethylene glycol) (PEG)) in the formation of the pores during phase separation in gelation bath (i.e. from the polymer poor phase, which appears at the phase separation) is explored. The effects of different molecular weight (Mw) of PEG in the gelation bath regarding the differential filter flows of nitrogen as well as their concentration are reflected from the porometry studies. The pore distribution is shifted as the molecular weight of PEG used in the gelation bath. The bubble point and mean flow pore diameters vary with the concentration as well as their molecular weight of PEG.

Se prepararon membranas de polisulfona mediante la técnica de separación de fase, introducida por Loeb-Sourirajan. La solución del polímero viscoso (en dimetilformamida) se esparce dentro de la película delgada, y se sigue por una inmersión en el medio de gelación (agua). Se explora la influencia del aditivo polimérico (poli(etilénglicol) (PEG)) en la formación de los poros durante la fase de separación en el baño de gelación (desde la fase escasa en polímero, la cual aparece en la separación de fases). De los estudios de porometría, se observan los efectos en las diferencias en peso molecular del PEG en el baño de gelación sobre los flujos diferenciales de nitrógeno así como de la concentración. La distribución de poros se desplaza de acuerdo con el peso molecular del PEG empleado en el baño de gelación. El punto de burbujeo y la media en los diámetros de los poros de flujo varían en función de la concentración y del peso molecular del PEG.

1411 downloads

Radio detection of cosmic rays with LOPES (LOPES Collaboration)
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Grupen, C.

; Apel, W.D.

; Asch, T.

; Badea, A.F.

; Bähren, L.

; Bekk, K.

; Bercuci, A.

; Bertaina, M.

; Biermann, P.L.

; Blümer, J.

; Bozdog, H.

; Brancus, I.M.

; Buitink, S.

; Brüggemann, M.

; Buchholz, P.

; Butcher, H.

; Chiavassa, A.

; Cossavella, F.

; Daumiller, K.

; Di Pierro, F.

; Doll, P.

; Engel, R.

; Falcke, H.

; Gemmeke, H.

; Ghia, P.L.

; Glasstetter, R.

; Haungs, A.

; Heck, D.

; Hörandel, J.R.

; Horneffer, A.

; Huege, T.

; Kampert, K.H.

; Kolotaev, Y.

; Krömer, O.

; Kuijpers, J.

; Lafebre, S.

; Mathes, H.J.

; Mayer, H.J.

; Meurer, C.

; Milke, J.

; Mitrica, B.

; Morello, C.

; Navarra, G.

; Nehls, S.

; Nigl, A.

; Obenland, R.

; Oehlschläger, J.

; Ostapchenko, S.

; Over, S.

; Petcu, M.

; Petrovic, J.

; Pierog, T.

; Plewnia, S.

; Rebel, H.

; Roth, M.

; Schieler, H.

; Sima, O.

; Singh, K.

; Stümpert, M.

; Toma, G.

; Trinchero, G.C.

; Ulrich, H.

; van Buren, J.

; Walkowiak, W.

; Weindl, A.

; Wochele, J.

; Zabierowski, J.

; Zensus, J.A.

; Zimmermann, D.

Brazilian Journal of Physics

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Dez 2006, Volume 36 Nº 4a Páginas 1157 - 1164

Resumo: En | Texto: En | PDF: En

Data taken with a radio antenna array in combination with the ground-level air shower experiment KASCADE-Grande at the Forschungszentrum Karlsruhe open up the possibility to measure large extensive air showers with this new technique. The pulse height of the observed radio signals scales with the primary energy of the particles initiating the air shower. The dependence of the radio signal on the angle of the shower axis with respect to the Earth's geomagnetic field and the coherence of the radiation suggest that the radio signal generation is due to the geosynchrotron mechanism.

2785 downloads

Organotin Dithiohydrazodicarbonamides as Corrosion Inhibitors for Mild Steel-Dimethyl Sulphoxide Containing HCl
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Rastogi, R.B.

; Singh, M.M.

; Singh, K.

; Yadav, M.

Portugaliae Electrochimica Acta

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2005, Volume 23 Nº 2 Páginas 315 - 332

Resumo: En | Texto: En | PDF: En

A few 1-aryl-2,5-dithiohydrazodicarbonamides and their triphenyltin and dibutyltin complexes have been studied as corrosion inhibitors for mild steel in dimethyl sulphoxide containing HCl at 25 ºC using electrochemical polarisation technique. Among dithiohydrazodicarbonamides, ethoxyphenyl derivative exhibited maximum inhibition efficiency (IE) followed by benzyl and phenyl analogues. The same order of IE was observed in their corresponding organotin complexes; however, IE of a complex was found to be significantly higher than that of the constituents ligand. All organotin complexes behaved predominantly as cathodic inhibitors. Triphenyltin complexes proved to be better corrosion inhibitors than their dibutyltin analogues.

729 downloads Citado 1 vez em SciELO

Substituted Dithiobiurets, their Molybdenum and Tungsten Complexes as Corrosion Inhibitors for Mild Steel in Sulphuric Acid
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Rastogi, R.B.

; Yadav, M.

; Singh, K.

; Singh, M.M.

Portugaliae Electrochimica Acta

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2004, Volume 22 Nº 2 Páginas 127 - 147

Resumo: En | Texto: En | PDF: En

The inhibition of mild steel corrosion in 1N sulphuric acid was studied in the presence of various concentrations (10-150 ppm) of substituted dithiobiurets and their molybdenum and tungsten complexes at 25 °C. All the compounds behaved as ambiodic corrosion inhibitors for mild steel and were considered to inhibit the corrosion by getting adsorbed on the surface. The inhibition efficiencies (IEs) of the complexes, in general, were found to be appreciably higher than those of corresponding ligands. However, the IE values of the complexes of molybdenum and tungsten of the same ligand did not differ much in their magnitude indicating thereby that the nature of central metal ions hardly influenced the inhibition efficiency. The slight difference in the IEs of the complexes at a given concentration seems to be caused by the slight difference in their size. The variation in IEs of different derivatives of ligands has been attributed to change in their size, number of active sites for adsorption and the electron density on these active sites. Scanning Electron Microscopy was used to study the surface of corroded and inhibited specimens.

818 downloads

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Changes in the thyroid gland during the reproductive cycle of the male vespertilionid bat, Scotophilus heathi
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KRISHNA, A.

; SINGH, K.

Revista Brasileira de Biologia

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Nov 1998, Volume 58 Nº 4 Páginas 707 - 716

Resumo: Pt En | Texto: Pt En | PDF: Pt | PDF: En

O objetivo do presente estudo foi comparar as mudanças na glândula tireóide com o ciclo reprodutivo de S. heathi. A tireóide mostrou variação sazonal marcada em peso, quantidade de colóide e altura do epitélio folicular, sugerindo que esta glândula está inativa durante a quiescência e o torpor de inverno e ativa durante o tempo de recrudescência e acasalamento, similarmente ao ciclo testicular. A concentração de tiroxina (T4) do plasma mostrou significantes mudanças sazonais com alta concentração durante o acasalamento e pós-acasalamento e baixa concentração durante a quiescência. Entretanto, a concentração plasmática de T4 aumentou da fase reprodutiva à pós-reprodutiva, quando o peso dos testículos estava se reduzindo. Sugere-se que, em S. heathi, a estreita correlação entre os ciclos testicular e tireóideo durante algumas fases do ciclo reprodutivo esteja relacionada à sensibilidade aumentada no período reprodutivo e à atividade metabólica.

The aim of present study was to compare the changes in thyroid gland with the reproductive cycle of S. heathi. Thyroid showed marked seasonal variation in weight, quantity of colloid and follicular epithelial height, suggesting the thyroid gland to be inactive during quiescence and winter dormancy and active during the time of recrudescence and breeding similarly to the testicular cycle. Plasma thyroxin (T4) concentration showed a significant seasonal change with high concentration during breeding and post-breeding and low concentration during quiescence. However, the T4 concentration increased from breeding to post-breeding phase, when the testes weight was declining. It is suggested that in S. heathi the positive correlation between thyroid and testicular cycles occurs only during the phases of the reproductive cycle when the body weight and testicular activity are also closely correlated.

1852 downloads

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