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Biomedical subjects

L C Teixeira

Publications and source records attributed to L C Teixeira.

At least 19 recordsLinked to original sources
PubMed2003

Responses of Holstein cows to a low dose of somatotropin (bST) prepartum and postpartum.

Objectives were to evaluate the effects of a low dose of bovine somatotropin (bST) injected prepartum and postpartum on body condition score (BCS), body weight (BW), and milk yield (MY) in cows as well as somatotropin insulin, insulin-like growth factor-I (IGF-I), glucose, and nonesterified fatty acids (NEFA) in plasma. Holstein cows nearing second or later parities were assigned randomly to control (CON = 98) or bST-treated (TRT = 95) groups. Biweekly injections of bST began 21 +/- 3 d before expected calving and continued through 42 d postpartum (CON vs. TRT; 0 vs. 10.2 mg of bST/ d). From 42 to 100 d postpartum, no cows received bST. During yr 1, somatotropin, IGF-I, insulin, NEFA, and glucose were measured in plasma samples from 82 cows. During yr 2, effects of bST on BCS and BW of 111 cows were evaluated, but no blood samples were collected. Milk yields through 100 d of all 193 cows were analyzed. Prepartum treatment with bST resulted in greater prepartum plasma concentrations of somatotropin, insulin, and numerically greater NEFA but did not affect glucose or IGF-I. Postpartum bST increased mean plasma concentrations of somatotropin and NEFA, but not INS, IGF-I, or glucose. Mean BCS of cows did not differ prepartum, around parturition, or postpartum. Although mean BW did not differ prepartum or around calving, cows receiving bST maintained greater BW postpartum. Cows receiving bST tended to have higher MY (6.6%) in the first 60 d of lactation, but differences did not persist through 100 d, including approximately 40 d when no cows received bST. Number of cows that were culled due to health (CON = 3 vs. TRT = 2) or died (CON = 3 vs. TRT = 1) were not affected by treatment. Low doses of bST in the transition period resulted in higher postpartum BW, quicker recovery of body condition during lactation, and significantly more milk during treatment.

Animals↗
PubMed2003

Breast cancer metastatic to uterine leiomyosarcoma. A case report and review of the literature.

An unusual case of breast cancer metastatic to leiomyosarcoma of the uterus is reported. The patient had multiple metastases from the breast carcinoma and presented a pelvic mass in its evolution. A laparotomy with total hysterectomy and bilateral oophorectomy was performed to give pain relief. A review of the world literature about these uncommon sites of breast metastases is presented.

Biopsy, Needle↗
PubMed2000

Simultaneous saccharification and cofermentation of peracetic acid-pretreated biomass.

Previous work in our laboratories has demonstrated the effectiveness of peracetic acid for improving enzymatic digestibility of lignocellulosic materials. The use of dilute alkali solutions as a pre-pretreatment prior to peracetic acid lignin oxidation increased carbohydrate hydrolysis yields in a synergistic as opposed to additive manner. Deacetylation of xylan is easily achieved using dilute alkali solutions under mild conditions. In this article, we evaluate the effectiveness of peracetic acid combined with an alkaline pre-pretreatment through simultaneous saccharification and cofermentation (SSCF) of pretreated hybrid poplar wood and sugar cane bagasse. Respective ethanol yields of 92.8 and 91.9% of theoretical are achieved using 6% NaOH/15% peracetic acid-pretreated substrates and recombinant Zymomonas mobilis CP4/pZB5. Reduction of acetyl groups of the lignocellulosic materials is demonstrated following alkaline pre-pretreatments. Such processing may be helpful in reducing peracetic acid requirements. The influence of deacetylation is more significant in combined pretreatments using lower peracetic acid loadings.

Biomass↗
PubMed1996

Clinical evaluation of gallium alloy as a posterior restorative material.

This study evaluated 30 gallium alloy (Gallium alloy GF) and 31 amalgam (Dispersalloy) restorations over a period of 8 months in both Class I and Class II cavity preparations in 28 human subjects. At baseline, all gallium alloy and amalgam restorations were considered acceptable (Alfa) in terms of caries, anatomic form, marginal adaptation, surface texture, and bulk fracture. Postoperative sensitivity was reported in 67% of the gallium alloy restorations and in 29% of the amalgam restorations. At 8 months, 61% of the gallium alloy restorations were rated Beta for marginal adaptation, and all restorations exhibited tarnish and corrosion. With a few exceptions, the amalgam restorations were rated Alfa for those criteria. Three gallium alloy restorations had to be replaced during the evaluation period because of severe postoperative sensitivity and 39% of gallium restorations still presented some sensitivity at 8 months. Additional problems exhibited by gallium restorations were tooth fractures, tooth cracks, and marginal whitening.

Alloys↗
PubMed1992

Effect of polishing burs and stones on the micro-hardness of dental amalgam.

Square standard cavities were prepared in human teeth and restored with amalgam obtained from alloys of different trade-marks. Twenty-four hours after condensation, excess amalgam was removed from three of the four margins, each with a different rotatory instrument (number 4 bur, multiblade finishing bur, and fine green stone). No rotatory instrument was used on the fourth margin (control), and this control was polished with pumice and zinc-oxide pastes and Sweeney's brushes. Vickers' tests for micro-hardness of the amalgam were performed on the four margins of the restorations. The restorations were then submitted to metallographic polishing, and a second micro-hardness measurement was made seven days later. The statistical analysis of the data showed that micro-hardness values were higher at the margins on which no rotatory instruments were used. The lowest micro-hardness values were found at the margins where finishing and/or round burs were used. Polishing with fine green stones gave intermediate values.

Analysis of Variance↗
PubMed1992

Clinical microleakage evaluation of a cavity varnish.

This clinical study evaluated the microleakage effectiveness of a cavity varnish when used in combination with two types of amalgam: a spherical particle and a dispersed phase alloy. Calcium hydroxide was utilized as the microleakage detection agent. Copalite showed a reduction in microleakage when it was employed with the spherical particle alloy used in this study. This study clinically demonstrated that Copalite is not totally effective in eliminating microleakage.

Bicuspid↗
PubMed1990

Situation of radiotherapy in Latin America.

A survey to evaluate situation of radiotherapy in Latin America was conducted. Consultation was made with representatives of 10 countries, resulting in the responses of 5. These five countries represent around 80% and 81%, respectively, from the total area and population of South America. Situation of equipment, modern facilities, and human resources is analyzed. A Cobalt machine is the basic megavoltage equipment in Latin America; half of the total number, however, is of old units with very low output sources. Linacs represent one-third of cobalt machines, the majority of low photon energy without electron capability. Treatment planning, localization, patient positioning, and immobilization are inadequade or of low quality in a high number of institutions. Teaching programs are insufficient or inexistent in certain areas. Late diagnosis and referral for treatment is a major problem for cancer control in Latin America. Hierarchization and regionalization of radiation therapy centers are indicated as a way to provide high quality services and teaching programs. In Latin America, lodging and facilities for transportation are essential to assure the continuity of radiation treatment and regular follow-up to patients from rural or distant areas.

Cancer Care Facilities↗
PubMed1989

Clinical evaluation of a posterior composite resin containing a semiporous filler particle.

Bowen recently developed a new filler particle for composite resin restorations. The surface particles of a diphasic strontium glass are superficially etched and after silanating the surface, the microscopic defects are filled with prepolymerized resin. The filler particles are then bonded chemically and mechanically to the resin matrix. This paper discusses the clinical performance of this material as a posterior composite resin over a two year period.

Bicuspid↗
PubMed1987

Estrogen receptors in breast cancer--therapeutic response to the treatment of recurrences.

The authors analyze estrogen receptors in 501 cases of breast cancer and the therapeutic response achieved with treatment of patients who relapsed. The method utilized to determine the presence of estrogen receptor was cytosol protein-counting and Dextran coated charcoal (DCC) saturation analysis. Patients were treated with chemotherapy when the primary tumor was estrogen-receptor negative. If receptor was present, anti-estrogen drug (Tamoxifen) was added. Patients previously treated with the anti-estrogen presented a better response to anti-estrogen therapy and a lower recurrence rate. Recurrences were more frequent in estrogen receptor negative cases and better responses to treatment were found in estrogen receptor positive ones.

Antineoplastic Combined Chemotherapy Protocols↗
PubMed1986

Wear rates of posterior composite resins.

The wear rates of nine posterior composite resins were determined for a period of up to 3 years. The wear rates observed depended on the method used for evaluation. A quantitative method of evaluation showed that the wear rates decreased with time. With the use of the quantitative measurements obtained at the end of 6 months after insertion, it was possible to predict the average annual rates of wear at the end of 3 years.

Bicuspid↗
PubMed1985

[Neurocutaneous melanosis: autopsy study of a case].

The clinical, radiological and autopsy features of a 5-month-old child with neurocutaneous melanosis are described. The patient had multiple disseminated benign cutaneous nevi. The pneumoencephalogram showed non-obstructive hydrocephalus. The patient died at the third day of hospitalization and autopsy was performed. A mild hydrocephalus and melanic specks in cerebellum and in the brainstem were disclosed.

Brain Diseases↗
PubMed1977

The acid-etch class III composite resin restoration.

The acid-etch systems have become a familiar part of the dentist's armamentarium for achieving retention in the treatment of major esthetic problems in anterior teeth. They have another advantage, however, that has not been fully utilized. By combining the acid-etch technique with conventional cavity preparations such as the Class III, the common problems associated with microleakage can be greatly reduced and composite resin restorations can be placed with better esthetic results and greater longevity.

Acid Etching, Dental↗
PubMed1976

[Bilateral cerebral mycotic aneurysm in a child. Report of a case and review of the literature].

The case of a 6 year-old boy, who was hospitalized with the diagnosis of purlent meningits is reported. The CSF examination disclosed pleocytosis and the antibioticotherapy was instituded. The bilateral carotid angiography demonstrated an arterial aneurysm of the frontal ascendent artery with hematoma in the left side and another in the posterior temporal artery, in the right side. The patient was operated on because of the hematoma, in the left side. The condition of the patient in the post-operatory period deteriorated and the death ocurred. The post-mortem examination disclosed a sub-arachnoidal hemorrhage, fronto-temporal hematoma in the left side and a para-capsular hematoma in the right side. The histological examination of the central part of the right side. The histological examination of the central part of the hematoma revealed a dilated arterial walls with a supurative inflammatory process.

Aneurysm, Infected↗