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Biomedical subjects

J S Rodrigues

Publications and source records attributed to J S Rodrigues.

10 recordsLinked to original sources
PubMed2005

Utilization of magnetic and electrostatic separation in the recycling of printed circuit boards scrap.

The progress of the technology is directly related to the growth of production and consumption of electrical/electronics equipment, especially of personal computers. This type of equipment has a relatively short average lifetime, 2-3 years. The amount of defective or obsolete equipment has been increasing substantially; consequently its disposition and/or recycling should be studied. In this work, printed circuit boards, which are used in personal computers, were studied in order to recover the metals in the circuit boards through mechanical processing, such as crushing, screening, as well as magnetic and electrostatic separation. The results obtained demonstrate the feasibility of using these processes to separate metal fractions from polymers and ceramics, and that it is possible to obtain a fraction concentrated in metals containing more than 50% on average of copper, 24% of tin and 8% of lead.

Ceramics↗
PubMed2003

Novel core(polyester)-shell(polysaccharide) nanoparticles: protein loading and surface modification with lectins.

This study describes new lectin-decorated or protein-loaded nanoparticles with a hydrophobic poly(epsilon-caprolactone) (PCL) core and a hydrophilic dextran (Dex) corona. In this view, a family of block Dex-PCLn copolymers was first synthesized, consisting of a Dex backbone to which n preformed PCL blocks were grafted. The ability of these new copolymers to form nanoparticles was evaluated in comparison with a series of PCL homopolymers of various molecular weights (2000, 10,000 and 40,000 g/mole). Two different nanoparticle preparation methods have been developed and tested for their efficacy to incorporate proteins. For this, three proteins were used: a model protein, bovine serum albumin (BSA), a lectin from leaves of Bauhinia monandra (BmoLL) and Lens culinaris (LC) lectin. All these proteins were successfully incorporated in nanoparticles with a mean diameter around 200 nm. Lectins could also be adsorbed onto the surface of Dex-PCLn nanoparticles. Surface-bound BmoLL conserved its hemagglutinating activity, suggesting the possible application of this type of surface-modified nanoparticles for targeted oral administration. Caco-2 cellular viability was higher than 70% when put in contact with Dex-PCLn nanoparticles, even at concentrations as high as 660 microg/ml.

Animals↗
PubMed2000

[Security of healthcare data networks used for epidemiological studies].

Record linkage, for compiling sameperson records from various source files, can improve the feasibility of epidemiological research using populationbased studies. The question is comply with the European legislation on data privacy and data security. For example, a computerized record hash coding and linkage procedure is described to link medical information within the framework of epidemiological followup. Before their extraction, files are rendered anonymous using a oneway hash coding based on the standard hash algorithm (SHA) function. Once rendered anonymous using the software ANONYMAT, the linkage of patient information can be accomplished by means of a mixture model, taking into account several identification variables. An application of this anonymous record linkage procedure was carried out in order to link medical files on cancer, from 3 hospitals of the French RhôneAlpes region. This application stresses how the use of the ANONYMAT software allows compliance with the legislation on data confidentiality without entailing problems on data availability.

Computer Communication Networks↗
PubMed1998

An epidemiological study on the prevalence of dental caries and treatment need in 12-15 year old children in Bhiwandi (Maharashtra).

An epidemiological survey of the prevalence of dental caries and treatment need in the powerloom township of Bhiwandi revealed a prevalence level of 56.93%. The overall mean DMFT score was 1.25 +/- 1.34. Decayed teeth accounted for the largest component of the reported DMF teeth followed by an almost equal proportion of missing and filled teeth. Single surface restorations were the most frequent type of treatment required, followed by the two or more surface restorations, extractions and pulp therapy.

Adolescent↗
PubMed1998

Prevalence of dental caries and treatment need in 12-15 year old municipal school children of Mumbai.

This epidemiological survey attempted to establish the level of dental caries and treatment need among the municipal school children of Mumbai. The prevalence of dental caries was 68.02% which increased with age. The lowest DMFT score was recorded in the 12 year age group while the highest DMFT Score was recorded in 15 year age group. Decayed teeth accounted for the greatest percentage of DMF teeth followed by the missing and filled components in all the age groups. Single surface restorations accounted for the greatest percentage of treatment need followed by two or more surface restorations and extractions.

Adolescent↗
PubMedDate not supplied

[Surgical treatment of carcinoma of the esophagus: automatic suture versus manual suture].

The authors have reviewed the anastomosis and sutures utilized for the surgical treatment of 38 patients with carcinoma of the esophagus and cardia. They have compared results following the stapled anastomosis and sutures with those following hand sutured procedures (30 anastomosis and 13 sutures) performed by the same group of surgeons. The stapled anastomosis were performed utilizing a new circular stapling device and gastric and jejunal stapled sutures, utilizing Nakayama's clamp. When anastomosis and sutures were performed by hand suturing, standard techniques were utilized. Patients were grouped in three categories: Group I if the gastric or jejunal sutures or the esophagogastric or esophagojejunal anastomosis were hand sutured; Group II wherein both stapled and hand sutures were performed; Group III when the esophageal anastomosis and related sutures were all performed by stapling devices. Different factors with possible adverse effect on suture healing were also studied. The incidence of suture related complications ranged between 4,2 and 29,1% for Group I; 1,8 and 19,2% for Group II; 0 and 16,2% for Group III. The 60-day operative mortality rate was 23% for Group I (8,4-50,9%), 17,64% for Group II (6,4-25,9%) and 0% (0-28,3%) for Group III. It is felt that better results were obtained with stapled sutures.

Esophageal Neoplasms↗