Biomedical subjects
Publications and source records attributed to R Springer.
Saline augmentation mammaplasty has dramatically increased in popularity over the past 5 years. Maximizing immediate and long-term results requires skilled perioperative nursing intervention.
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The use of an expander/implant for augmentation mammaplasty allows for increased patient satisfaction in the postoperative period. Surgical time may be shortened as final volume determination is not an intraoperative concern, and secondary surgery for certain complications such as asymmetry, wrinkling, and capsular contracture can often be avoided.
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Among 1,500 patients treated with extracorporeal shock wave lithotripsy, 1,300 had calculi less than 2.5 cm in diameter and 200 had calculi of 2.5 cm or larger. Although most patients did well and required no further radiologic intervention, 178 interventional radiologic procedures were performed. Urinary tract obstruction often developed in patients with large stones when the collecting system filled with stone fragments (steinstrasse). Nephrostomy was performed in 5.3% of the total patient population and in 29% of the patients with stones measuring 2.5 cm or more. Only 1.8% of the patients with calculi smaller than 2.5 cm required radiologic intervention. When the obstructed collecting system could not be crossed with conventional angiographic techniques, the stone fragments were removed through a percutaneous nephrostomy tract either by flushing or by suctioning with a pulsating water jet.
Several lytic and lysogenic actinophages were isolated from soil samples infected with Streptomyces cattleya and S. venezuelae. The morphologies and some biological properties of the phages, and the physico-chemical characteristics of their DNAs, were compared. Electron micrographs indicated that all the phage heads were of an icosahedral form, but head size and length of the tail varied. Two of the phages had a broad host range; the other isolates could lyse only a limited number of species. The molecular sizes of the phage DNAs were between 32.2 and 98.5 kb as estimated by electron microscopy and restriction enzyme analysis. The same study also indicated that one of the DNA species contained cohesive ends. The G + C content of the DNAs ranged between 45.1 and 74.2 mol % as estimated from melting studies. Sedimentation velocity experiments implied that several of the phage DNAs were probably heavily glycosylated or methylated. These modifications might explain the partial or slow digestion of some of the DNAs by several of the 23 restriction enzymes tested. Protoplasts of the appropriate Streptomyces strains could be efficiently transfected with phage DNA in the presence of 25% (w/v) polyethylene glycol (mol. wt 6000).
Off the transconjugants formed in the R. lupini conjugation 0.5 to 5% are merodiploids. When two differently pigmented parents are used in the crossing experiment the diploid transconjugants by their additive pigmentation type. The segregation patterns of these diploid clones were analyzed. The results are in agreement with the theory that the exogenotic donor DNA can be integrated at different sites of the homologous recipient chromosomal region forming a tandem sequence. Consequently the segregants of these merodiploid clones are formed by endochromosomal recombination.
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Explore the source record for details and available documents.
Explore the source record for details and available documents.
In a survey of 51 broiler chicken flocks, the incidence of chickens dying from acute death syndrome and of those with skeletal deformities varied from 0.71 to 4.07% and from 0.46 to 4.08% among the flocks, respectively. The average incidence of those with skeletal deformities was 1.72%; 1.10% were culled in the field, and 0.62% were condemned or downgraded as carcasses. The major types of skeletal deformities were valgus deformation of the intertarsal joint (70%), varus deformation of the intertarsal joint (9%), tibial rotation (7%), and spondylolisthesis (14%). The strain and source of chickens and the management and nutritional practices were recorded for each flock. Statistical analyses were conducted in an attempt to identify factors that might correlate with the incidence of either chickens dying from acute death syndrome or those with skeletal deformities. Results of these analyses are discussed.