282 research outputs found
Viability of bull semen extended with commercial semen extender and two culture media stored at 24 °C
The aim of this study was to evaluate the viability of bull spermatozoa diluted with commercial semen extender and two culture media stored at controlled room temperature (24 °C) for 72 hours. Two Nguni bulls were used for semen collection with the aid of an electro-ejaculator. After macroscopic evaluation, semen was pooled and aliquoted randomly into Triladyl, modified Hamâs F10, and TCM-199 culture media, and then stored at 24 °C. Sperm motility parameters, morphology, and viability were analysed with computer aided sperm analysis (CASA) after 0, 24, 48 and 72 hours. The study was replicated four times, and data were analysed using analysis of variance (ANOVA). Triladyl had significantly higher sperm viability rate (41.3%) and total motility rate (96.3%) for 72 hours than modified Hamâs F10 (86.8%; 26.5%) and TCM-199 (76.7%; 25.0%) culture media. Hamâs F10 had higher progressive motility rate (37.8%) than the other extenders TCM-199 (31.7%) and Triladyl (23.4%). There was no significant difference in viability rate between Hamâs F10 (26.5%) and TCM-199 (25.0 %) after 72 hoursâ storage at 24 °C. Furthermore, no significant difference was observed in total sperm abnormalities, except for reacted acrosomes and absent tails, between the two Nguni bulls. Nguni semen can be preserved in Triladyl or modified Hamâs F10 and TCM-199 culture media, stored at 24 °C, and stay viable for 72 hours.Keywords: Hamâs F10, TCM-199, Triladyl, sperm motility, viabilit
Limitations to sharing entanglement
We discuss limitations to sharing entanglement known as monogamy of
entanglement. Our pedagogical approach commences with simple examples of
limited entanglement sharing for pure three-qubit states and progresses to the
more general case of mixed-state monogamy relations with multiple qudits.Comment: Pedagogical review article on monogamy and polygamy of entanglemen
Allogeneic Ex Vivo Expanded Corneal Epithelial Stem Cell Transplantation: A Randomized Controlled Clinical Trial:Allogeneic Limbal Stem Cell Therapy
Beyond the epsilon band: polygonal modeling of gradation/uncertainty in area-class maps
Q methodology and rural research
Traditionally, rural scholarship has been limited in its methodological approach. This has begun to change in recent years as rural researchers have embraced a range of different methodological tools. The aim of this article is to contribute to greater methodological pluralism in rural sociology by introducing readers to a method of research that is rarely engaged in the field, that is, Q methodology. The article describes the defining features of the approach as well as providing examples of its application to argue that it is a method that offers particular opportunities and synergies for rural social science research
Nanoparticles for Applications in Cellular Imaging
In the following review we discuss several types of nanoparticles (such as TiO2, quantum dots, and gold nanoparticles) and their impact on the ability to image biological components in fixed cells. The review also discusses factors influencing nanoparticle imaging and uptake in live cells in vitro. Due to their unique size-dependent properties nanoparticles offer numerous advantages over traditional dyes and proteins. For example, the photostability, narrow emission peak, and ability to rationally modify both the size and surface chemistry of Quantum Dots allow for simultaneous analyses of multiple targets within the same cell. On the other hand, the surface characteristics of nanometer sized TiO2allow efficient conjugation to nucleic acids which enables their retention in specific subcellular compartments. We discuss cellular uptake mechanisms for the internalization of nanoparticles and studies showing the influence of nanoparticle size and charge and the cell type targeted on nanoparticle uptake. The predominant nanoparticle uptake mechanisms include clathrin-dependent mechanisms, macropinocytosis, and phagocytosis
Safety assessment of essential medicines for elderly people: a bibliographic survey
Certain medicines are considered potentially inappropriate (PIM) for elderly people as they increase the risk of adverse drug events (ADE) and because safer alternative therapies are available on the market. In this context, in order to identify the instruments that assess the quality of medical prescriptions for elderly and to determine which drugs are considered PIM, a bibliographic survey was conducted in PUBMED, LILACS and PAHO databases, in February and March/2010. The search strategy included the use of health descriptors and a manual search in the references cited by selected papers. During the period of data collection, 15 instruments were identified. In 2012, with the publication of the update of Beers criteria, this instrument was included in the study. We identified 163 PIM of 25 therapeutic classes, of which 125 (76.7%) are marketed in Brazil. Of these, 31 (24.8%) are essential medicines (RENAME 2012), of which 13 have safer therapeutic equivalents and 19 (15.2%) are over-the-counter drugs. Data suggest the need for inclusion of safer alternatives for the elderly in the national list of essential medicines and the pharmaceutical care for early detection of ADE in this age group, in order to contribute to the safe use of medicines
Becoming a Prison Officer: An Analysis of the Early Development of Prison Officer Cultures
Despite the fact that over recent years, imprisonment in Scotland has adopted a bold and aspirational policy direction including proposed reforms to the role of the prison officer, there has been little research into prison officers in Scotland, and by extension, the Scottish Prison Service as an organisation. This paper offers a unique empirical insight into prison officer recruits and evolving prison officer cultures, by longitudinally tracking 31 prison officer recruits over training and early working experience. This paper provides an in-depth perspective on prison officer recruitsâ views and experiences, and it also makes a contribution to the emerging area of research of the Scottish Prison Service through a focus on organisational change and reform. Finally, it incorporates and further develops a body of literature on penality and the penal state by interrogating the tensions between policy and practice within the context of the Scottish penal system
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