PubMed Health⌕ Search

Biomedical subjects

Richard Schwarz

Publications and source records attributed to Richard Schwarz.

5 recordsLinked to original sources
PubMed2005

Trojans in habitable zones.

With the aid of numerical experiments we examined the dynamical stability of fictitious terrestrial planets in 1:1 mean motion resonance with Jovian-like planets of extrasolar planetary systems. In our stability study of the so-called "Trojan" planets in the habitable zone, we used the restricted three-body problem with different mass ratios of the primary bodies. The application of the three-body problem showed that even massive Trojan planets can be stable in the 1:1 mean motion resonance. From the 117 extrasolar planetary systems only 11 systems were found with one giant planet in the habitable zone. Out of this sample set we chose four planetary systems--HD17051, HD27442, HD28185, and HD108874--for further investigation. To study the orbital behavior of the stable zone in the different systems, we used direct numerical computations (Lie Integration Method) that allowed us to determine the escape times and the maximum eccentricity of the fictitious "Trojan planets."

Computer Simulation↗
PubMed2004

Reasons for late presentation of cleft deformity in Nepal.

OBJECTIVES: To determine the causes of late presentation of patients with cleft lip and palate in Nepal. DESIGN: Cross-sectional survey using interviews of patients' parents. SETTING: The study was carried out between April 1999 and September 1999 in Western Regional Hospital (WRH), Pokhara, Nepal, a secondary care center. PATIENTS: All patients with cleft lip and palate coming to WRH outpatient department or coming for surgery were included in the study. Those without parents were excluded. A total of 53 patients were included. RESULTS: Forty-two (79%) presented after 3 months. The most common reasons were lack of knowledge of availability of repair (31%), lack of accessibility of care (29%), and lack of finances (24%). CONCLUSIONS: In Nepal, the majority of patients with cleft present late, mainly because of a lack of awareness of cleft services, the remoteness of available services, or a lack of finances. These obstacles can be largely surmounted through itinerant services.

Child, Preschool↗
PubMed2002

Tendon transfer for triple nerve paralysis of the hand in leprosy.

Paralysis of ulnar, median and radial nerves is seen in less than 1% of those affected with leprosy. This condition is a particular challenge for the surgeon, physiotherapist, and patient. A retrospective chart review was conducted at the Green Pastures Hospital and Rehabilitation Centre (GPHRC) and Anandaban Leprosy Hospital (ALH) in Nepal, and results were graded by the system outlined by Sundararaj in 1984. Thirty-one patients were identified, and 21 charts were available for review. Excellent or good results were obtained in 93% of patients for wrist extension, 85% of patients for finger extension, 90% of patients for thumb extension, 71% of patients for intrinsic reconstruction, and 63% of patients for thumb opposition reconstruction. These results are reasonable but inferior to those obtained by Sundararaj in his study. Surgical intervention offers a very significant improvement in function in these very difficult hands. Intensive physiotherapy is required both pre- and postoperatively.

Adult↗