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Técnicas para la preparación de ojos de cadáver utilizadas para practicar cirugía intraocular del segmento anterior Techniques for preparing postmortem human eyes to perform anterior segment intraocular surgery
LG Vargas,L Werner,SK Pandey,LP Werner
Archivos de la Sociedad Espa?ola de Oftalmología , 2003,
Abstract: Describimos las técnicas para preparar ojos humanos o animales obtenidos postmortem empleados en el Centro de Investigaciones en Terapéutica Ocular y Bio-implantes, Storm Eye Institute, Medical University of South Carolina, Charleston, SC, EE.UU. Estas técnicas han sido utilizadas para prácticar diferentes procedimientos quirúrgicos (facoemulsificación, extracción extracapsular de cristalino, etc.), y para el entrenamiento de cirujanos en transición. La práctica de estas técnicas en el laboratorio ha contribuido a mejorar la habilidad quirúrgica para realizar los pasos críticos de la cirugía de facoemulsificación. La evaluación patológica de los globos humanos pseudofáquicos obtenidos postmortem mediante la técnica posterior de Miyake-Apple, y el análisis histológico han sido fundamentales en el estudio de complicaciones postoperatorias de cirugía de catarata (opacidad de cápsula anterior, opacidad de cápsula posterior) secundarias a proliferación postoperatoria de células epiteliales del cristalino dentro del saco capsular. Las modificaciones en las técnicas quirúrgicas y en el dise o de las lentes intraoculares han ayudado a disminuir estas complicaciones postoperatorias. El implante de diferentes tipos de lentes afáquicos y fáquicos en ojos humanos y animales obtenidos postmortem ha permitido un mejor análisis del tama o y la posición de nuevos dise os de lentes dentro del ojo. We describe different methods to prepare postmortem human or animal eyes used at the Center for Research in Ocular Therapeutics and Biodevices at the Storm Eye Institute, Medical University of South Carolina, Charleston, SC, USA. These techniques have been utilized for performing different surgical procedures (phacoemulsification, extracapsular cataract extraction, etc.), and for training of surgeons in-transition. Performing these techniques in the wet-laboratory contributed to improve surgical skills to perform the critical steps of the phacoemulsification surgery. Pathological evaluation of pseudophakic postmortem human eyes using the Miyake-Apple posterior view and histology was helpful to analyze postoperative complications of cataract surgery (anterior capsule opacification and posterior capsule opacification) secondary to postoperative proliferation of lens epithelial cells into the capsular bag. Modifications in the surgical techniques and/or lens design may be helpful to reduce these postoperative complications. Implantation of various aphakic and phakic intraocular lenses in postmortem human eyes as well as animal eyes was helpful to analyze the sizing and fitting of
Técnicas para la preparación de ojos de cadáver utilizadas para practicar cirugía intraocular del segmento anterior
Vargas,LG; Werner,L; Pandey,SK; Werner,LP; Schmidbauer,JM; Zuleta,V; Escobar-Gómez,M; Apple,DJ;
Archivos de la Sociedad Espa?ola de Oftalmología , 2003, DOI: 10.4321/S0365-66912003000200004
Abstract: we describe different methods to prepare postmortem human or animal eyes used at the center for research in ocular therapeutics and biodevices at the storm eye institute, medical university of south carolina, charleston, sc, usa. these techniques have been utilized for performing different surgical procedures (phacoemulsification, extracapsular cataract extraction, etc.), and for training of surgeons in-transition. performing these techniques in the wet-laboratory contributed to improve surgical skills to perform the critical steps of the phacoemulsification surgery. pathological evaluation of pseudophakic postmortem human eyes using the miyake-apple posterior view and histology was helpful to analyze postoperative complications of cataract surgery (anterior capsule opacification and posterior capsule opacification) secondary to postoperative proliferation of lens epithelial cells into the capsular bag. modifications in the surgical techniques and/or lens design may be helpful to reduce these postoperative complications. implantation of various aphakic and phakic intraocular lenses in postmortem human eyes as well as animal eyes was helpful to analyze the sizing and fitting of new lens designs within the eye.
Comparative studies on progeny test results from stations and field data
LG Christensen
Genetics Selection Evolution , 1971, DOI: 10.1186/1297-9686-3-1-110b
Abstract:
Recently published papers: We are what we eat?
LG Forni
Critical Care , 2002, DOI: 10.1186/cc1527
Abstract: Anonymous English proverbOver the past few months yet more information bombards us. Several papers have concentrated on nutrition and markers thereof, in an attempt to make sense of much data.Current interest in blood glucose levels focuses on examining patients' glucose tolerance to predict outcomes. This is particularly pertinent to high-dependency and coronary care practice, as well as intensive care unit (ICU) work. The DIGAMI study highlighted the long-term post-myocardial infarction (MI) risk in patients with a deranged glycometabolic state [1]. Similarly, the intensive care population has been scrutinized with regard to glycometabolic control in septic critically ill patients. Strict glycaemic control in such individuals is now hopefully commonplace, with the aim of improving survival. This has prompted much work to delineate those individuals with impaired glycometabolic control, and the same group presented further evidence that abnormal glucose metabolism is associated with a high prevalence of acute MI [2]. A total of 181 consecutive nondiabetic patients admitted with acute MI were given standard glucose tolerance testing at discharge and 3 months later. Fewer than 35% of patients had normal glucose tolerance at 3 months of follow up. It would appear likely, then, that early detection of impaired glycometabolic control might improve outcome by allowing introduction of secondary preventative measures. This probably has little immediate relevance to the ICU, but for those of us who are involved in coronary care it is worthwhile bearing in mind that an HbA1c on admission may well indicate long-term risk and is a relatively quick and inexpensive test.Nutritional support is often regarded as the Cinderella of the intensivist's armamentarium, probably because it does not generate the same excitement as the latest test for inflammatory mediators or suchlike. However, rather like toothache, it is best not ignored. Intense debate continues as to the preferred rout
Características de la capa límite del fondo en el Alto Golfo de California a partir de perfiles de velocidad
Alvarez, LG;
Ciencias marinas , 2010,
Abstract: the vertical structure of currents in the upper gulf of california was studied using velocity profiles observed at a site in 25 m water depth during one fortnightly cycle, in order to determine the development of a logarithmic bottom layer and to estimate parameters derived from the law of the wall. the velocity data included two neap-tide periods in which gravity currents have been shown to develop. the currents were dominated by tidal forcing, and were oriented along-gulf, with the main axis towards 323.8°. spring tide velocity amplitude was 0.5-0.9 m s-1, decreasing to less than 0.30 m s-1 during neap tides. a logarithmic layer structure was observed within the lower half of the water column during spring tides. this layer was less than 5 m thick during neap tides, and was not observed under low velocity conditions, around the times of current reversals. the seabed shear stress values were typical of macrotidal environments, reaching ±2.5 pa under spring tide conditions and decreasing by a factor of 2-3 during neap tides. mean values of the bottom drag coefficient and seabed roughness parameter were 10-2 and 0.05 m, respectively. these relatively high values were attributed to the influence of near-bed stratification. during the two neap-tide periods, two gravity current events were observed within 4-5 m from the seabed, reaching 0.30 m s-1, intensified by the ebb tidal flow. the near-bed velocity profiles were markedly modified during these events that persisted for about three days.
The role of religious values in extending social protection: A South African perspective
LG Mpedi
Acta Theologica , 2008,
Abstract: This article reflects critically on the role played by religious networks – in particular the African Independent Churches or African Initiated Churches (AICs) – in enhancing social protection by means of informal coping mechanisms in the South African context. It also examines various factors that contribute towards informal social security dependency in AICs, namely the influence of the Constitution of the Republic of South Africa, the limited scope of social security coverage, the restricted family concept (underlying much of the formal system which does not reflect the family context in South Africa), African traditional values, and Christian principles. In addition, the article investigates the nature of the relationship between informal coping mechanisms (such as those in AICs) and formal social security, i.e. whether informal social security strengthens or weakens formal social security. It finally explores ways and means of strengthening informal social security, in particular in the wake of challenges such as HIV/AIDS, urbanisation and migration.
Modelul de date al intreprinderii. O abordare orientata obiect
Cretu LG
Scientific Annals of the Alexandru Ioan Cuza University of Iasi : Economic Sciences Series , 2005,
Abstract:
Mathematical Rotordynamic Model Regarding Excitation Due to Elliptical Shaft Journals in Electrical Motors Considering the Gyroscopic Effect  [PDF]
Ulrich Werner
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.48A009
Abstract:

The paper presents a mathematical rotordynamic model regarding excitation due to elliptical shaft journals in sleeve bearings of electrical motors also considering the gyroscopic effect. For this kind of excitation, a mathematical rotordynamic model was developed considering the influence of the oil film stiffness and damping of the sleeve bearings, the stiffness of the end-shields and bearing housings, the stiffness of the rotor, the electromagnetic stiffness in the air gap of the electrical motor and the mass moment of inertia of the rotor and therefore also considering the gyroscopic effect. The solution of the linear differential equation system leads to the mathematical description of the absolute orbits of the shaft centre, the shaft journals and the bearing housings and to the relative orbits between the shaft journals and the bearing housings. Additionally, the bearing housing velocities can also be derived with this mathematical rotordynamic model.

Dependence of Gravity Induced Absorption Changes on the Earth’s Magnetic Field as Measured during Parabolic Flight Campaigns  [PDF]
Werner Schmidt
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.411190
Abstract:

Various spectroscopic experiments performed on the AIRBUS ZERO G—located in Bordeaux, France—in the years 2002 to 2012 exhibit minute optical reflection/absorption changes (GIACs) as a result of gravitational changes between 0 and 1.8 g in various biological species such as maize, oats, Arabidopsis and particularly Phycomyces sporangiophores. During a flight day, the AIRBUS ZERO G conducts 31 parabolas, each of which lasts about three minutes including a period of 22 s of weightlessness. So far, we participated in 11 parabolic flight campaigns including more than 1000 parabolas performing various kinds of experiments. During our campaigns, we observed an unexplainable variability of the measuring signals (GIACs). Using GPS-positioning systems and three dimensional magnetic field sensors, these finally were traced back to the changing earth’s magnetic field associated with the various flight directions. This is the first time that the interaction of

Gravireception in Phycomyces: Threshold Determination on the Sounding Rocket TEXUS 50  [PDF]
Werner Schmidt
Journal of Modern Physics (JMP) , 2015, DOI: 10.4236/jmp.2015.610143
Abstract: Under parabolic flight conditions microgravity is not lower than 3 to 5 times 10-2 g. In contrast to parabolic flights, sounding rocket flights are virtually vibrational-free allowing microgravity as low as 10-5 g. Thus, a rotating platform serving as centrifuge allows the precise generation of gravitational forces ranging from 5 to 100 mg (not possible during parabolic flights). On this basis we determined the threshold1 for optical reflection/absorption changes in Phycomyces to be lower than 25 × 10-3 g. This compares well with the threshold determination of gravitropism in Phycomyces on a clinostat centrifuge. Kinetics of gravity-induced absorption changes and gravity as generated by the on-board centrifuge do not coincide but show a distinctive hysteresis with a latency of 4 s (75 mg-ramp, pull-up).
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