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Vacuum Pump (vacuum + pump)
Selected AbstractsA comparison between the experimental and estimated evaporation paths from emulsionsFLAVOUR AND FRAGRANCE JOURNAL, Issue 4 2009Abeer Al-Bawab Abstract The evaporation paths in linalool emulsions were experimentally determined using a rotary evaporator coupled to a vacuum pump and calculated from vapour pressures for a series of emulsions with varied oil/water (O/W) ratios. The evaporation paths were comparable to an acceptable degree, suggesting that determination of the evaporation path under reduced pressure, combined with a straightforward calculation using vapour pressures, can be used to estimate the evaporation under different relative humilities. Copyright © 2009 John Wiley & Sons, Ltd. [source] Formulation of sodium iodide (Na 123I) oral capsule,JOURNAL OF LABELLED COMPOUNDS AND RADIOPHARMACEUTICALS, Issue 5-6 2007A. Sattari Abstract Sodium iodide-123 (Na123I) is well known as a radioisotope that is used for studies of the thyroid and its metastases. 123I was produced from the reaction of 28 Mev protons with 99.99% enriched 124Xe by cyclotron. A home made target was installed and used for this purpose. The main part of the target contained target vessel, target windows and cooling system. In addition, some other part such as a cold finger, decay vessel, vacuum pump and four fingers were also designed and installed on the system. After bombardment, the production of 123I from 123Cs, the target was left for 6 hours and then rinsed with distilled water. A clear and colourless solution containing 123I was pumped to the hot cell. For adjusting the pH, sodium citrate buffer was used. The solution was added directly to the capsules which were already filled with inert powder. Each capsule contained 210 µCi Na123I. Quality control has shown 98% radiochemical and 99.96% radionuclide purity, with the yield of 2 mCi/µA. Quality control results had good accordance with the United States Pharmacopoeia. Copyright © 2007 John Wiley & Sons, Ltd. [source] On activated seed swelling techniquePOLYMER INTERNATIONAL, Issue 8 2005Shiva Zohrehvand Abstract The activated seed swelling technique is one of the promising methods in synthesis of micron-sized monodispersed polymer particles. However, there are some parameters (eg the interference of acetone residue on particle swelling) that make this method difficult to carry out and even lead to a broad particle-size distribution. Here, these parameters are studied and how to control them is discussed. The polydisperse seed swelling appeared at lower concentration of acetone and with incomplete evaporation of acetone from the system. The monodisperse swelling and larger particle sizes were achieved at higher concentration of acetone and longer evaporation time using a vacuum pump. These results suggest that the particle size and particle-size distribution in the activated seed swelling technique can be controlled by the carrier (acetone) and the hydrophobe concentration in aqueous medium before and after the swelling process. Copyright © 2005 Society of Chemical Industry [source] Procedure for Maximizing Oocyte Harvest for In Vitro Embryo Production in Small RuminantsREPRODUCTION IN DOMESTIC ANIMALS, Issue 4 2007A Gibbons Contents Possible effects of repeated hormonal treatments and laparoscopic ovum pick-up (LOPU) on the efficiency of oocyte recovery rate and quality were determined in sheep and goats. In six adult Merino sheep and five Criolla goats, ovarian status was synchronized by a prostaglandin F2, analogue and the insertion of an intravaginal sponge 48 h later. Follicle development was stimulated by a single dose of FSH (60 mg NIH-FSH-P1) plus a single dose of equine chorionic gonadotrophin (eCG; 300 UI). The first FSH/eCG doses were administered 48 h after the sponge insertion, being repeated every 4 days to complete a total of four treatments in sheep and three in goats. Follicles in both ovaries were categorized according to their diameter and follicular fluid was aspirated under laparoscopic observation without a vacuum pump. In sheep, during a 12-day-period, a total of 347 follicles were aspirated with a recovery rate of 46.9%. In goats, during an 8-day-period, 219 follicles were aspirated with a recovery rate of 45.6%. In both species, there were no significant differences in the number of aspirated follicles, oocyte recovery rate and good quality oocyte recovery rate. However, in sheep the oocyte recovery rate was higher for large follicles, whereas in goats no such effect was detected. In summary, current results indicate that retrieval of oocytes can be maximized, without affecting oocyte quality, by repeating ,oneshot' FSH/eCG regimes and LOPUs at intervals as short as 4 days. [source] Challenges and Strategies Related to Hearing Loss Among Dairy FarmersTHE JOURNAL OF RURAL HEALTH, Issue 4 2005Louise Hass-Slavin MSc ABSTRACT: Context: Farming is often imagined to be a serene and idyllic business based on historical images of a man, a horse, and a plow. However, machinery and equipment on farms, such as older tractors, grain dryers, and vacuum pumps, can have noise levels, which may be dangerous to hearing with prolonged, unprotected exposure. Purpose: This qualitative study in Ontario, Canada, explored the challenges and coping strategies experienced by dairy farmers with self-reported hearing loss and communication difficulties. Through in-depth interviews, 13 farmers who experience significant hearing loss were questioned about the challenges they face as a result of hearing loss and the strategies they use to overcome or compensate for problems. Findings: The 2 major challenges encountered by dairy farmers with a hearing loss were: (1) obtaining information from individuals, within groups, and through electronic media; and (2) working with animals, machinery, and noise. To cope with these challenges, participants used strategies identified as problem and emotion focused. Conclusions: Four themes arose from analysis of the challenges encountered and strategies used: 1Hearing loss is experienced as a "familiar," but "private," problem for dairy farmers. 2Communication difficulties can negatively affect the quality of relationships on the farm. 3Safety and risk management are issues when farming with a hearing loss. 4The management or control of excessive noise is a complex problem, because there are no completely reliable yet practical solutions. [source] | |||||||||||||