16 research outputs found
Continuous collection of volatiles produced by <i>Streptomyces</i> grown on oatmeal agar by headspace extraction and GC-MS
Initial experience with the Codman Certas adjustable valve in the management of patients with hydrocephalus
BACKGROUND: A new adjustable valve, the Codman Certas(TM) valve for treatment of hydrocephalus was introduced into clinical practice in January 2011. It has 8 different settings with an opening pressure varying from 36 to over 400 mm H(2)O at a flow rate of 20 mL/h. The 8th setting is designed to provide a "virtual off" function. The objective of this report is to describe the initial clinical experience with the Certas(TM) valve and evaluate clinical usage with the main focus on the portable adjustment device - Therapeutic Management System (TMS), the “virtual off” setting and compatibility with magnetic resonance imaging (MRI). FINDINGS: Forty-two patients with hydrocephalus from different etiologies were treated with the Certas(TM) adjustable shunt system. Data regarding implantation procedures, the use of the TMS system, x-ray imaging, and MRI procedures were recorded prospectively. All patients had clinical follow-up at four weeks after implantation and every three months until a stable clinical condition was obtained. The mean time for follow-up was 8.6 months (1–16.6). Seventy-one adjustments were performed with the TMS, 12 were problematic. Twenty-nine MRI procedures were performed and did not cause accidental resetting. Five patients were treated with the "virtual off" function for a period. CONCLUSIONS: We found the Certas(TM) valve valuable in the treatment of hydrocephalus, usability of the TMS was high because it is small and portable, but in some cases we experienced adjustment problems with the first procedures performed by a surgeon, indicating that there is a learning curve. The "virtual off" function provided a possibility of treating over-drainage without the need for shunt ligation or other invasive procedures
Chemical and sensory quantification of geosmin and 2-methylisoborneol in rainbow trout (<em>Oncorhynchus mykiss</em>) from recirculated aquacultures in relation to concentrations in basin water
Geosmin fluctuations and potential hotspots for elevated levels in recirculated aquaculture system (RAS):a case study from pikeperch (<i>Stizostedion lucioperca</i>) production in Denmark
Tainting of rainbow trout by taste and odor compounds in freshwater aquaculture systems in Denmark
Case study on depuration of RAS-produced pikeperch (Sander lucioperca) for removal of geosmin and other volatile organic compounds (VOCs) and its impact on sensory quality
Effect of depuration on content of geosmin in pikeperch (Sander lucioperca) produced in a commercial RAS farm
was examined during a 15-day period. Concentrations of geosmin in the fish were related to geosmin content in
the water. For depuration, half of the water volume in a 230 m3 production tank was replaced daily with
geosmin-free water. After 8 days of depuration and absence of feeding, content of geosmin in the fish was
reduced from 710 ± 245 ng/kg to 165 ± 50 ng/kg (mean ± SD, p < .01). Additional depuration for 7 days
only reduced the geosmin content to 135 ± 24 ng/kg. Geosmin concentration in the water was initially 34 ng/L
but declined to 10 ng/L after 15 days. Changes in geosmin concentrations in water of the depuration tank
indicated that geosmin was released by the fish during the depuration. In addition to removal of geosmin, the
depuration also decreased concentrations of 28 different volatile compounds from the fish. Sensory analysis
showed decrease in intensity of geosmin flavor upon depuration and improved the overall sensory quality of the
fish after 2 weeks of depuration. Our study shows that geosmin and other off-flavors in pikeperch from RAS
production can efficiently be removed to be a level that is below the threshold to most consumers