Maya Müller

IROC

Toughness is one of important material properties. At present steel is still the most used material. Owing to the temperature this material can fail both brittly and ductily. Therefore we look for the temperature above which the material will failur ductily. The Charpy impact test is one of methods how to determine the ductility by the temperature...

Soil processing belongs among basic tasks in the field of plant production. An intensive wear of changeable wearable parts occurs during soil processing. Within conventional soil processing, significant part of the wear of the ploughing body is concentrated on the ploughshare. The research focused on using overlay material for the purpose of increa...

Aim: The aim of this study was to evaluate the functional effect of bilateral implantation of apodised diffractive versus progressive multizonal refractive multifocal intraocular lenses compared to standard monofocal intraocular lenses. Patients and method: 229 patients underwent cataract extraction; 66 Array SA40N (AMO, Irvine, CA, USA), 76 SA6...

Background: Many clinical investigations cannot be carried out at the examination unit or a slit lamp. Here we present three new options to obtain digital pictures in a routine clinic at a slit lamp and evaluate how user friendly they are. Methods: A) First, a digital photo documentation is examined at a conventional slit lamp by a modified bino...

Purpose: To compare the safety, efficacy, and postoperative management of canaloplasty in one eye versus trabeculectomy with mitomycin C in the contralateral eye in patients with open-angle glaucoma. Methods: This study was a consecutive case series of 30 eyes of 15 patients who had prior trabeculectomy with mitomycin C (group II) and later were...

Beschrieben wird der ungewöhnliche klinische Befund eines schnell wachsenden, exophytischen, unpigmentierten Bindehauttumors einer 57-jährigen Frau, der mittels histopathologischer Untersuchungen als malignes Melanom der Bindehaut diagnostiziert wurde. Die unterschiedlichen Phänotypen und das äußerst seltene Auftreten dieser Erkrankung erschweren e...

The case of a 57-year-old woman with a rapidly growing unpigmented conjunctival tumor is presented. Despite the clinical appearance the histology surprisingly confirmed a malignant melanoma of the conjunctiva. Various phenotypes and the rareness of this disease complicate a clinical diagnosis. Therapeutically, a complete excision of the tumor inclu...

AIM: The aim of this study was to evaluate the functional effect of bilateral implantation of apodised diffractive versus progressive multizonal refractive multifocal intraocular lenses compared to standard monofocal intraocular lenses. PATIENTS AND METHOD: 229 patients underwent cataract extraction; 66 Array SA40N (AMO, Irvine, CA, USA), 76 SA60D3...

Purpose: Due to increasing cost pressure in the public health system treatments and their costs are highly relevant in the therapy for chronic diseases such as glaucoma. In the era of diagnosis-related group (DRG) reimbursement, new interventions need to prove not only their safety and effectiveness but also their cost-utility. Canaloplasty as a n...

Single pulse broadband Coherent Anti-Stokes Raman Scattering (CARS) was used to measure the thermal non-equilibrium flow properties in the high enthalpy hypersonic flow field (11.8 MJ/kg, 5800 K) of the arc heated facility L3K in Cologne. Nitrogen CARS was applied in the free stream flow at 64 mbar and in the vicinity front of a probe body at app....

Diabetes mellitus, as well as subsequent ocular complications such as cystoid macular edema (CME), are of fundametal socio-economic relevance. Therefore, we evaluated the influence of internal limiting membrane (ILM) removal on longterm morphological and functional outcome in patients with diabetes mellitus (DM) type 2 and chronic CME without evide...

Epiphora is the result of hypersecretion or reduced tear outflow because of relative or absolute obstruction of the lacrimal system. For the treatment a specific surgical procedure is usually required. Herein we present the subjective and objective findings of 243 consecutive patients with non-irritative induced epiphora, who underwent an operation...

Background Arteritis temporalis (AT) shows a variable course of the disease and may lead to transient or permanent visual loss. Patients and methods In a retrospective consecutive case series 66 patients with suspected AT were followed up of which 65 underwent arterial biopsy. Symptoms, therapy and complications were followed up. Results Of the pat...

To evaluate the diagnostic potential of a slit-lamp (SL)-adapted Fourier-domain (= spectral radar, SR) optical coherence tomography (OCT)-SL-SR-OCT-instrument as an in vivo imaging device for use in examinations of the anterior and posterior segments. In a pilot study, 88 eyes from 70 healthy volunteers and patients were examined using a prototype...

In the therapeutic approach to complex glaucomas different initial situations were considered: pre-existing glaucoma, induction of glaucoma after vitreoretinal surgery and antiglaucomatous procedures. In pre-existing glaucoma and after filtering surgery maintenance of the filtering bleb requires a vitreoretinal approach for conjunctiva preservation...

The coincidence of cataract and glaucoma is increasing due to population development. Trabeculectomy is still the most commonly used procedure in combined glaucoma-cataract surgery. However, a two-step approach, starting with cataract surgery should be preferred to minimize the risk of secondary filtering bleb scarring. Postoperative fibrin exudati...

Glaucoma and corneal disorders are often associated and are of diagnostic, therapeutic and prognostic relevance for each other. Glaucoma is already present in approximately 15% of eyes prior to keratoplasty, whereas in addition approximately 15% of cases are diagnosed following corneal transplantation. Corneal opacities, surface irregularities and...

Secondary glaucoma represents a frequent complication especially in chronic forms of uveitis. Different immunological and mechanical alterations can be responsible for the elevation of intraocular pressure (IOP). To enable a tailored treatment strategy the diagnostic process has to include the search for characteristic findings which can be indicat...

In the therapeutic approach to complex glaucomas different initial situations were considered: pre-existing glaucoma, induction of glaucoma after vitreoretinal surgery and antiglaucomatous procedures. In pre-existing glaucoma and after filtering surgery maintenance of the filtering bleb requires a vitreoretinal approach for conjunctiva preservation...

Glaucoma and corneal disorders are often associated and are of diagnostic, therapeutic and prognostic relevance for each other. Glaucoma is already present in approximately 15% of eyes prior to keratoplasty, whereas in addition approximately 15% of cases are diagnosed following corneal transplantation. Corneal opacities, surface irregularities and...

The coincidence of cataract and glaucoma is increasing due to population development. Trabeculectomy is still the most commonly used procedure in combined glaucoma-cataract surgery. However, a two-step approach, starting with cataract surgery should be preferred to minimize the risk of secondary filtering bleb scarring. Postoperative fibrin exudati...

BACKGROUND: Arteritis temporalis (AT) shows a variable course of the disease and may lead to transient or permanent visual loss. PATIENTS AND METHODS: In a retrospective consecutive case series 66 patients with suspected AT were followed up of which 65 underwent arterial biopsy. Symptoms, therapy and complications were followed up. RESULTS: Of the...

Microincision cataract surgery (MICS) represents a new level in the development of cataract surgery. Phacoemulsification with intraocular lens (IOL) implantation via incisions of ≤2 mm may be performed by the coaxial approach, such as conventional phacoemulsification but with a smaller diameter of the phaco tip (C-MICS), or by the biaxial approach,...

Microincision cataract surgery (MICS) represents a new level in the development of cataract surgery. Phacoemulsification with intraocular lens (IOL) implantation via incisions of <or=2 mm may be performed by the coaxial approach, such as conventional phacoemulsification but with a smaller diameter of the phaco tip (C-MICS), or by the biaxial approa...

Background: Optical coherence tomography (OCT) is new diagnostic procedure that has rapidly evolved in the last years. The recently developed spectral domain OCT allows one to increase the imaging speed by a hundred times compared to the first generation time domain OCT and enables three-dimensional imaging as well as real-time imaging of fast movi...

Hintergrund: Die optische Kohärenztomografie (OCT) ist ein relativ junges diagnostisches Verfahren, das in den letzten Jahren eine rasante Entwicklung durchlaufen hat. Die neue Technik des Spektral-Domain-OCT (SD-OCT) erlaubte es, die Messgeschwindigkeit hundertfach zu steigern. Es wird dadurch eine dreidimensionale Gewebsdarstellung und eine Echtz...

Minimally invasive imaging of ocular surface pathologies aims at securing clinical diagnosis without actual tissue probing. For this matter, confocal microscopy (Cornea Module) is in daily use in ophthalmic practice. Multiphoton microscopy is a new optical technique that enables high-resolution imaging and functional analysis of living tissues base...

A corneal penetration secondary to inflammation or chronic trophic disease is an emergency situation in ophthalmology. The ocular globe is instable and there is a significant risk of an endophthalmitis. A corneal graft for a tectonic transplantation may not be available in many cases. The prognosis of an emergency corneal transplantation is relativ...

Hintergrund: Eine Hornhautpenetration im Rahmen eines entzündlichen oder chronisch-trophischen Ulkus ist eine ophthalmologische Notfallsituation. Das Auge ist instabil und die Gefahr einer Endophthalmitis besteht. Da ein Hornhauttransplantat zur Durchführung einer Keratoplastik nicht immer direkt vorhanden ist, untersuchten wir die initiale Behandl...

Background: Peripheral exudative haemorrhagic chorioretinopathy (PEHCR) is a degenerative disease of the peripheral retina and choroid in the elderly. Although PEHCR is often seen by clinicians, this entity is underrepresented in the ophthalmological literature. This may be due to inconsistent naming. Patients: We present the clinical, ultrasono...

Peeling of the internal limiting membrane is the treatment of choice for macular holes. Fresh platelet suspension (PS) is used to support wound healing in persistent macular holes. The concentration of growth factors in fresh, frozen, and thrombin-activated PSs were compared, to optimize their trophic potential and examine their capacity to support...

Peripheral exudative haemorrhagic chorioretinopathy (PEHCR) is a degenerative disease of the peripheral retina and choroid in the elderly. Although PEHCR is often seen by clinicians, this entity is underrepresented in the ophthalmological literature. This may be due to inconsistent naming. We present the clinical, ultrasonographic and angiographic...

ABSTRACT The pathogenesis of vertebrobasilar ischemia (VBI) is still uncertain. Embolism and systemic hypotension have been discussed as possible causes. We evaluated the basilar arteries of 35 VBI-patients by transcranial Doppler-sonography at rest and under hypercapnic conditions and compared these findings with the basilar flow velocities in 10...

Purpose: To describe two patients with peripheral Coats disease-like tumor reaction years after surgical repair for rhegmatogenous retinal detachment. Methods: Retrospective review of two clinical cases. Results: Patient 1 presented with visual deterioration caused by a retinal angiomatous tumor and lipid exudates originating from telangiectatic ve...

Abrasive wear of high alloyed overlay materials with high contents of carbide phases of M7C3 depends on the sizes of the carbide particles and on their distribution in an overlay. This work is focused on the study of the carbide particles size effect on abrasive wear. The size of carbide particles of M7C3 type, their distribution (part) in the matr...

Hardfacing is one of the most useful and economical ways to improve the performance of components submitted to severe wear conditions. This study has been made for the comparison of microstructure and abrasion resistance of hardfacing alloys reinforced with chromium carbides or complex carbides. The hardfacing alloys were deposited onto ČNS EN S235...

Degradation processes cause huge material and economic losses all over the world. On one hand, in today's globalised society, various climatic changes occur affecting products in different ways. On the other hand, different specific degradation media exist in specific branches of the human activity. Due to the influence of the degradation environme...

We report on room temperature continuous wave single mode GaInAsSb-GaSb quantum well lasers emitting beyond 3 mu m. Quantum well strain and composition were carefully adjusted to enhance the hole confinement without increasing electron confinement in order to avoid inhomogeneous quantum well pumping. In order to realize single mode emission as prer...

Since the early 1970 s, silicone oil injection was used for the treatment of complicated retinal detachments. Especially in this early period, the possible complications of silicone oil tamponade were difficult to assess. Today, we strive to reduce the duration of silicone oil tamponade - aiming at a removal within 3 - 6 months. A permanent tampona...

INTRODUCTION: Since the early 1970 s, silicone oil injection was used for the treatment of complicated retinal detachments. Especially in this early period, the possible complications of silicone oil tamponade were difficult to assess. Today, we strive to reduce the duration of silicone oil tamponade - aiming at a removal within 3 - 6 months. A per...

In recent years, the rapid development of diagnostic optic devices has generated optical coherence tomography (OCT) as a new, non-invasive diagnostic method. With technical progress of the infrared spectrum at 1,310 nm, OCT of the anterior segment also became feasible. With anterior segment OCT different examinations which so far were ruled out by...

Autologous serum has been advocated for the treatment of persistent corneal epithelial defects and other ocular surface disorders which may be a local manifestation of a systemic disease. Many of these underlying disorders are cytokine-mediated and require immunosuppressive therapy. The systemic disease and medication could potentially influence th...

Autosomal dominant (familial) exudative vitreoretinopathy (adEVR) is a rare, congenital disease of the retinal vascular system, which may lead to blindness in severely affected eyes. One of the causative disease genes is located on chromosome 11q13-q23 and codes for "frizzled-4" (FZD4), a protein involved in vascular differentiation. Examination of...

Die in den letzten Jahren erfolgte rasante Entwicklung im Bereich der diagnostischen optischen Verfahren brachte die Optische Kohärenztomographie (OCT) als neueres, nichtinvasives Diagnoseverfahren hervor. Durch die technische Weiterentwicklung im langwelligen Infrarot-Spektrum bei 1310 nm konnte die Optische Kohärenztomographie (OCT) auch am vorde...

Die autosomal-dominante (familiäre) exsudative Vitreoretinopathie (adEVR) ist eine seltene, genetisch bedingte Erkrankung des retinalen Gefäßsystems, die in schwer betroffenen Augen zur Blindheit führen kann. Eines der Krankheitsgene liegt auf dem Chromosom 11q13–q23 und kodiert für das ,,frizzled-4-“ (FZD4-)Protein, das an der vaskulären Differenz...

Weld deposits are one of the most used economical ways of the wear resistance increase. The study compares the characteristics of the overlay material welded-on and the abrasive wear resistance. The research has been carried out using hardfacing alloys reinforced with primary chromium carbides and complex carbides. The overlay material was deposite...

Anfang 2006 wurde ein 67-jähriger Mann wegen Uveitis und peripheren Gesichtsfelddefekten des rechten Auges in der Universitäts-Augenklinik vorstellig. Durch den vorbehandelden Augenarzt war bereits eine systemische Therapie mit 60 mg Prednisolon für eine Woche ohne Befundbesserung eingeleitet worden. Das Sehvermögen betrug rechtsseitig 0,4, linksse...

For the first time, lasers with short period superlattice based quantum wells have successfully been fabricated and characterized on the (AlGaIn)(AsSb) material system. These new quantum wells are composed of alternating InSb/GaxIn1-xSb layers with submonolayer thickness. Distributed-feedback lasers fabricated from the epitaxial layers emit in the...

Ocular involvement of syphilis still poses a clinical challenge due to the chameleonic behaviour of the disease. As the serodiagnosis has significant limitations, the direct detection of Treponema pallidum (TP) in the vitreous represents a desirable diagnostic tool. Real-time polymerase chain reaction (PCR) for the detection of TP was applied in di...

Evaluation of needling and 5-fluorouracil (5-FU) injections more than 4 months after preceding filtration surgery. Retrospective analysis of 17 eyes in 14 patients who underwent needling of the filtering bleb and administration of 5-FU by injection at least 4 months after trabeculectomy (TE) with mitomycin C (MMC; same surgeon throughout). Complete...

Background Evaluation of needling and 5-fluorouracil (5-FU) injections more than 4 months after preceding filtration surgery. Patients and Method Retrospective analysis of 17 eyes in 14 patients who underwent needling of the filtering bleb and administration of 5-FU by injection at least 4 months after trabeculectomy (TE) with mitomycin C (MMC; sam...

To present optical coherence tomography (OCT) for real-time imaging of cyclophotocoagulation effects. In a pilot study, real-time transscleral OCT images were generated during diode laser cyclophotocoagulation in four eyes of four patients suffering from uncontrolled glaucoma using a specially designed contact applicator containing the OCT fiber, a...

Ohne Zusammenfassung

The aim of this pilot study was to evaluate whether contact optical coherence tomography (OCT) allows visualization of the effects of cyclophotocoagulation. In this pilot study, transscleral contact OCT images (1310-nm wavelength) were generated prior to and immediately after conventional transscleral diode laser cyclophotocoagulation in three eyes...

The abrasive wear resistance of martensitic overlays is the function of many variables. The hardness is one of the variables. This fact is raised by the possibility of carbidic phases separating from the austenite in the course the overlay layer cooling and by the possibility of the further martensite disintegration and carbidic phases precipitatio...

Adhesive bonding is one of many materials connecting methods. In the last ten years periods the bonding technology noted a boom almost in all industrial branches. The use of bonding technology in the engineering and repairing industry brings considerable savings. Saving in costs, in critical metallic materials and in time are reached and the decrea...

Owing to operations the construction materials change their properties. The material properties and char - acteristics are considered as the most important. One of properties is the toughness of the used material. Toughness of steel as one of construction materials is expressively temperature-dependent. This dependence - transition behaviour, can v...

At present a great number of machines and mechanisms of various types are used in the industrial production. Often the whole operation depends on the trouble-free service of single parts and many times a minor defect may conduce to the shutdown of the whole production line or of the other operation. From this reason the uncaused losses of many thou...

In the paper there were published test results of the abrasive wear resistance of BOHLER THYSEN Co. overlay materials. Using the abrasion tester with abrasive cloth there was compared the abrasive wear resistance of single-, two- and three-layer overlays according to the ČSN 01 5084.

Investigation of slit-lamp-adapted 1310-nm optical coherence tomography (OCT) as an in vivo imaging device in the postoperative course of glaucoma surgery. Postoperative images of filtering blebs and deep sclerectomies and their healing processes were qualitatively evaluated with a slit-lamp-adapted anterior segment OCT (AS-OCT; Heidelberg Engineer...

To assess intraobserver and interobserver variability of anterior segment optical coherence tomography (AS-OCT) as an objective diagnostic tool to quantify the anterior chamber angle and opening width. University Eye Clinic, Lübeck, Germany. The anterior chamber angle and opening width were assessed in 18 eyes of 9 healthy volunteers by 2 observers...

We report a high-power optically pumped semiconductor vertical external cavity surface emitting laser operating at 2-mum wavelength. The gain material consisted of 15 GaInSb quantum-wells placed within a three-lambda GaSb cavity and grown on the top of an 18-pairs AlAsSb/GaSb Bragg reflector. For thermal management we have used a transparent diamon...

Room-temperature continuous-wave operation of a singlemode GaInAsSb/GaSb/AlGaAsSb distributed feedback (DFB) laser is presented at a record long emission wavelength for this material system of 2.843 μm. The threshold current at 20°C is 75 mA. Mode selection was realised by metal gratings laterally patterned to a ridge waveguide. By varying the grat...

in the last ten years periods the bonding technology noted a great boom not only in manufacturing industry but in repairing industry, too. The expansion of chemical industry is the cause of this boom. in this way the use of bonding technology in industrial applications brings considerable cost savings. For the successful use of adhesives the knowle...

To reduce the risk of endophthalmitis PVP-iodine is typically used preoperatively. Since iodine is contraindicated in patients with a specific allergic history or severe thyroid disorder we studied the effect of Lavasept, which contains Polyhexanid as an antiseptic alternative. In a randomized controlled double-blind trial 3 drops of 0.2% Lavasept,...

Hintergrund Da PVP-Iod bei Schilddrüsenerkrankungen und vorliegender Iodallergie nicht zur prophylaktischen Antiseptik in der Augenheilkunde angewendet werden kann, wurde als Alternative das polyhexanidhaltige Präparat Lavasept® untersucht. Patienten und Methoden Im Rahmen einer prospektiven, randomisierten, kontrollierten Doppelblindstudie unters...

We tested a 1310-nm optical coherence tomograph coupled with a beam splitter on the front lens of an operating microscope for intraoperative, noncontact visualization of anterior segment procedures. This new modification of optical coherence tomography technology allows intraoperative, high-resolution, cross-sectional imaging and pachymetry of the...

The Cassini-Huygens Cosmic Dust Analyzer (CDA) is intended to provide direct observations of dust grains with masses between 10-19 and 10-9 kg in interplanetary space and in the jovian and satumian systems, to investigate their physical, chemical and dynamical properties as functions of the distances to the Sun, to Jupiter and to Saturn and its sat...

In this work the instrumentation and characterization of a filterradiometer suitable for field measurements of O3 -> O(1D) photolysis frequencies, j(O1D), is described. A nonlinear calibration function considering ozone column and solar zenith angle is derived as well as a procedure utilizing an irradiance standard as an absolute reference. The mea...

[1] The International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) took place at Boulder, Colorado, from 15 to 19 June 1998 and offered the opportunity to test how well experimental techniques and theoretical models can determine the photolysis frequency of O3 → O(1D) in the troposphere. Different techniques measured the do...

Hintergrund Wir untersuchten die Wirksamkeit und Verträglichkeit von Lavasept® zur Antisepsis vor Kataraktoperation im Vergleich zu PVP-Iod- und Ringer-Lösung. Patienten und Methoden Präoperativ erhielten 29 Patienten je 3 Tropfen Lavasept®, 1,25% PVP-Iod- oder Ringer-Lösung zusätzlich zu einer intraoperativen Spülung des Bindehautsackes mit PVP-Io...

We examined the efficacy and tolerability of Lavasept (polyhexamethylenbiguanid or PHMB)-an iodine-free antiseptic-in comparison to polyvinylpyrolidon iodine and Ringer's solution, as an alternative preoperative antiseptic. In a randomized controlled double-blind trial 3 drops of Lavasept, 1.25%, PVP-iodine or Ringer's solution were applied preoper...

In situ observations of ClO mixing ratios obtained from a balloonborne instrument launched in Kiruna on 27 January 2000 and on 1 March 2000 are presented. ClO mixing ratios and quasi-simultaneously observed ozone loss are compared to model simulations performed with the Chemical Lagrangian Model of the Stratosphere (CLaMS). ClO mixing ratios are si...

Balloon-borne frost point hygrometers measured three high-resolution profiles of stratospheric water vapour above Ny-Alesund, Spitsbergen during winter 2002/2003. The profiles obtained on 12 December 2002 and on 17 January 2003 provide an insight into the vertical distribution of water vapour in the core of the polar vortex.The water vapour soundin...

To evaluate the role of vitrectomy in patients with visually disturbing vitreous body floaters and full visual acuity (VA). A total of 9 eyes from 8 patients (2 female, 7 male, median age 57 years) with a preoperative VA of 1.0 were analysed retrospectively. The median duration of symptoms was 12 months. In all eyes a pars plana vitrectomy was perf...

1] The photolysis frequency of NO 2 , j(NO 2), was determined by various instrumental techniques and calculated using a number of radiative transfer models for 4 days in June 1998 at the International Photolysis Frequency Measurement and Modeling Intercomparison (IPMMI) in Boulder, Colorado. Experimental techniques included filter radiometry, spect...

Purpose To evaluate the role of vitrectomy in patients with visually disturbing vitreous body floaters and full visual acuity (VA). Methods A total of 9 eyes from 8 patients (2 female, 7 male, median age 57 years) with a preoperative VA of 1.0 were analysed retrospectively. The median duration of symptoms was 12 months. In all eyes a pars plana vit...

Lidar measurements of polar stratospheric clouds (PSCs) and ozone have been performed by AWI in Ny-Ålesund (78.6N,11.6E) since winter 1988/89, and with several wavelengths since 1991/92. The stratospheric ozone DIAL at ALOMAR (69.3N,16.0E), jointly operated by FFI, NILU and the Andøya Rocket Range, started operation in December 1994. PSCs were repo...

Several of the winters during the 1990s are characterised by substantial ozone loss in the north polar vortex. The Arctic sonde network built during the last decade makes it possible to quantify this loss throughout the winter. The ozone mixing ratio based on ozonesonde data from a number of stations is studied as function of time at several isentr...