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Biomedical subjects

A Tapia

Publications and source records attributed to A Tapia.

At least 19 recordsLinked to original sources
PubMed1992

[Endoscopic treatment of gastroduodenal digestive hemorrhage].

Endoscopy is extremely useful for the diagnosis of upper gastrointestinal bleeding. At the present time, therapeutic measures are been used during the endoscopy to stop bleeding. This paper reports the experience of hospital de Talca in the endoscopic treatment of upper gastrointestinal bleeding. Thirty four patients (22 male) with bleeding not originating from esophageal or gastric varices were treated with direct absolute alcohol injection into the bleeding lesions. The procedure was successful in 31 patients. Three of the 34 patients required surgery, but only one of those successfully sclerosed (97% success). There were no complications attributable to the procedure. It is concluded that this therapeutic modality must be implemented in places were gastrointestinal endoscopy is performed.

Adolescent↗
PubMed1991

Subperiostic lifting.

Usually in subcutaneous or muscular rejuvenation techniques, work is concentrated on the lateral regions of the face and particularly on the cheek and cervical area. However, results are poor in the temporoparietal area and are virtually nonexistent in the frontonasal area. By making a coronal incision and extending it into the preauricular area followed by a subperiosteal approach so as to free the frontonasal, orbital rim, and zygomaticomalar areas, we can completely mobilize the upper half of the face thus improving it aesthetically.

Eyebrows↗
PubMed1991

[Digestive diseases in the elderly].

This study was carried out in two phases. First a survey was done, interviewing 57 apparently healthy persons, who were older than 60 years. Information was collected about previous illnesses and any digestive symptoms. Then a prospective study was developed in 43 out patients seen previously in a gastroenterological centre (aged 60 or older). The frequency and type of digestive diseases for this group of patients was established. Nineteen (33.3%) of the former 57 patients from the survey referred frequent digestive discomfort, predominantly symptoms related to the upper gastrointestinal tract, like epigastric pain, meteorism, early satiety, abdominal distention and pyrosis. These symptoms could be in part expected due to the physiological changes seen in the elderly, mainly in the esophagus. In the prospective study, digestive diseases related to the upper gastrointestinal tract were the most common (46.5%), followed by diseases from the colon and rectum (23.2%) and those of the liver, biliar tract and pancreas (16.2%). Taking into account the high incidence of gastrointestinal symptoms in the elderly, we must make special efforts to extend and or complete studies related to the geriatric population in our country. We need to establish rules for the control, prevention and early detection of such illness in order to promote higher standard in the quality of the life of population which will increased considerably in the near future.

Aged↗
PubMed1987

Liposuction in cervical rejuvenation.

Superficial musculoaponeurotic system (SMAS) has represented a confusing anatomical structure because descriptions of it in classical treatises of anatomy are contradictory. Also, utilization of this system in facial rejuvenation also does not coincide with the true anatomical facts regarding the superficial musculo-aponeurosis. A macroscopic and histological study of the region was carried out in order to determine the areas of fat deposits and the distribution of the true cervical superficial aponeurosis, partly in accordance with the statements by Jost and leaving aside the concept proposed by Mitz and Peyronie. Cervical liposuction was combined with the techniques for cervicofacial rhytidectomy.

Adipose Tissue↗
PubMed1977

Role of the pneumococcal autolysin (murein hydrolase) in the release of progeny bacteriophage and in the bacteriophage-induced lysis of the host cells.

The pneumococcal bacteriophage Dp-1 seems to require the activity of the N-acetylmuramic acid-L-alanine amidase of the host bacterium for the liberation of phage progeny into the medium. This conclusion is based on a series of observations indicating that the exit of progeny phage particles is prevented by conditions that specifically inhibit the activity of the pneumococcal autolysin. These inhibitory conditions are as follows: (i) growth of the bacteria on ethanolamine-containing medium; (ii) growth of the cells at pH values that inhibit penicillin-induced lysis of pneumococcal cultures and lysis in the stationary phase of growth; (iii) addition of trypsin or the autolysin-inhibitory pneumococcal Forssman antigen (lipoteichoric acid) to the growth medium before lysis; (iv) infection of an autolysin-defective pneumococcal mutant at a multiplicity of infection less than 10 (treatment of such infected mutant bacteria with wild-type autolysin from without can liberate the entrapped progeny phage particles); (v) release of phage particles and culture lysis can also be inhibited by the addition of chloramphenicol to infected cultures just before the time at which lysis would normally occur. Bacteria infected with Dp-1 under conditions nonpermissive for culture lysis and phage release secrete into the growth medium a substantial portion of their cellular Forssman antigen in the form of a macromolecular complex that has autolysin-inhibitory activity. We suggest that a phage product may trigger the bacterial autolysin by a mechanism similar to that operating during treatment of pneumococci with penicillin (Tomasz and Waks, 1975).

Amidohydrolases↗
PubMed1976

Suppression of the lytic and bactericidal effects of cell wallinhibitory antibiotics.

The bacteriolytic effect of beta-lactam antibiotics on Bacillus subtilis and on Streptococcus pneumoniae was found to be a function of the pH; lysis was suppressed if the pH of the pneumococcal culture was below 6.0 during penicillin treatment. In the case of B. subtilis, growth at pH 6.6 prevented penicillin-induced lysis. In pneumococci, the addition of trypsin to the growth medium also protected against lysis. The pH-dependent protection phenomenon resembled in several respects the antibiotic "tolerance" of pneumococci with a defective autolytic system. (i) At the pH nonpermissive for lysis, the bacteria retained their normal sensitivity to beta-lactam and to other cell wall inhibitors; however, instead of lysis, the drug-treated bacteria simply stopped growing. Loss of viability of the cells was also greatly reduced. (ii) Protection against lysis was independent of the dose and chemical nature of the cell wall inhibitors. (iii) The protection effect was reversible; lysis and loss of viability could be triggered by a postincubation of the drug-treated bacteria at the pH permissive for lysis.

Anti-Bacterial Agents↗