Biomedical subjects

L Wagner

Publications and source records attributed to L Wagner.

At least 973 records · Page 54Linked to original sources

PubMedDate not supplied

Separation of large DNA molecules with high voltage pulsed field gel electrophoresis.

We have developed two high voltage (3 kV and 10 kV) high speed pulsed field gel electrophoresis systems for the separation of DNA as large as 460 kbp. These systems enable us to combine the rapid speed of high voltages and the separation power of pulsed field electrophoresis to achieve high resolution and short run durations. We found that large DNA fragments can be separated at voltage gradients much higher than commonly used. Yeast chromosomes as large as 460 kbp can be separated in 4 h at 20 V/cm and 1-50 kbp DNA can be rapidly separated in 30 min at 55 V/cm. This is 25 times faster in mobility for the separation of relatively small DNA fragments (< 50 kbp). We have also found an inverse relationship between the voltage applied and the size separation limit at that particular voltage gradient (55 V/cm limits the separation to 50 kbp while 20 V/cm can separate up to 460 kbp). Depending on the size range, DNA can be separated 8- to 25-fold faster and with better resolution than existing electrophoretic systems.

Adenoviruses, Human↗

PubMedDate not supplied

[Hyperthyroidism in early childhood and a very rare variant of glutaric aciduria: coincidence or causal relation?].

Hyperthyrosis is a rare disease in early childhood typically characterized by tachycardia, restlessness, elevated body temperature, failure to thrive, diarrhoea, goiter and a tendency to hyperglycaemia. A 3-year old boy presented with typical symptoms of thyrotoxicosis accompanied by ketotic hypoglycemia and excessively high glutaric acid excretion. To our knowledge this association has so far not been described. Specific defects responsible for glutaric aciduria types I & II were excluded. Our patient suffered from glutaric aciduria type III which was described once and is characterized by mild metabolic signs.

Age Factors↗

PubMedDate not supplied

A greedy algorithm for aligning DNA sequences.

For aligning DNA sequences that differ only by sequencing errors, or by equivalent errors from other sources, a greedy algorithm can be much faster than traditional dynamic programming approaches and yet produce an alignment that is guaranteed to be theoretically optimal. We introduce a new greedy alignment algorithm with particularly good performance and show that it computes the same alignment as does a certain dynamic programming algorithm, while executing over 10 times faster on appropriate data. An implementation of this algorithm is currently used in a program that assembles the UniGene database at the National Center for Biotechnology Information.

Algorithms↗

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Using insurance claims data and medical record reviews to assess the quality of medical care.

This article examines the possibilities and limitations of using computerized insurance claims and outpatient medical records to evaluate a Medicaid managed care program. The quality of medical care delivered to enrollees 1 1/2 years into the MassHealth managed care program's operation is discussed in the context of an evaluation that was conducted by the University of Massachusetts-Boston's McCormack Institute in 1993. Study results suggest that these two data sources offer adequate information to determine the quality level of primary and preventive services and lead to further suggestions for evaluating care.

Adult↗

PubMedDate not supplied

Successful symptomatic management of a patient with Ménétrier's disease with long-term antibiotic treatment.

We present the case of a 79-year-old female patient with criteria typical for Ménétrier's disease, i.e. enlargement of the gastric folds due to foveolar hyperplasia associated with severe protein-loss along with epigastric pain, nausea, vomiting and weight loss. Gastrin levels were within the normal range, but elevated Helicobacter pylori antibody titers (83 microg/ml) were indicative of a recent infection. Histologic examination of a gastric polyp, which was removed in toto, revealed the presence of early gastric cancer of the mucosal type. After initiation of antibiotic treatment with clarithromycin (3 x 250 mg/day) and metronidazole (2 x 500 mg/day) in combination with lansoprazole (30 mg/day), the patient's condition improved rapidly along with abrogation of protein loss. Under maintenance treatment as indicated above, the patient has been free of symptoms now for a period of more than 2 years. On repetitive endoscopic follow-up, there was no change in gastric mucosa morphology either endoscopically or histologically, and also no evidence of recurrence of a malignant lesion. We conclude that this therapeutic regimen represented an effective alternative to surgical intervention in this patient and should be considered in similar cases.

2-Pyridinylmethylsulfinylbenzimidazoles↗

PubMedDate not supplied