H. Faradji, C. Rousset, S. Gautier-Sauvigné, R. Cespuglio
{"title":"Nitric oxide (NO) in brain: - detection by voltammetric methods - role in a rat model of absence epilepsy","authors":"H. Faradji, C. Rousset, S. Gautier-Sauvigné, R. Cespuglio","doi":"10.1109/MMB.2000.893773","DOIUrl":"https://doi.org/10.1109/MMB.2000.893773","url":null,"abstract":"The multiplicity of the functional aspects in which nitric oxide (NO) is involved, is now well documented. As yet, however, only a limited number of studies deal with a direct detection of NO in vivo. In the present paper, a procedure allowing such measurement by mean of a carbon fiber sensor coated with porphyrin-nickel and nafion is detailed. The effects of a NOS inhibitor and a NO donor on the cortical NO signal of the Wistar rat are also reported. In this respect, the disappearance of the signal observed after inhibition of the NO-synthase (L-ANA) as well as its increase after the administration of a NO donor (SIN-1) support that the signal measured at a 650 mV potential is NO dependent. Finally, the results obtained in using the NO sensor in GAERS rats (Genetic Absence Epileptic Rat from Strasbourg, an animal model for absence epilepsy) are briefly summarised. Data obtained indicate that NO exerts an antiepileptic role in facilitating paradoxical sleep. It is concluded that the NO sensor prepared can be efficiently used in vivo in physiological and pathophysiological situations.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"21 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124871059","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Porous silicon as a therapeutic biomaterial","authors":"L. Canham","doi":"10.1109/MMB.2000.893752","DOIUrl":"https://doi.org/10.1109/MMB.2000.893752","url":null,"abstract":"Silicon, the dominant semiconductor, has not been actively developed as a biomaterial, despite the attractiveness of chip-based microsystems for therapeutic applications. There is now both in-vitro and in-vivo evidence that silicon surfaces can be engineered to have bone-bonding potential, and that highly porous silicon can be biodegradable in the human body.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121741519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Balberg, K. Hristova, D. Brady, D. Beebe, L. Raskin
{"title":"Optical detection of molecular beacons in microfluidic devices","authors":"M. Balberg, K. Hristova, D. Brady, D. Beebe, L. Raskin","doi":"10.1109/MMB.2000.893820","DOIUrl":"https://doi.org/10.1109/MMB.2000.893820","url":null,"abstract":"Hybridization and detection of E. coli ribosomal RNA with molecular beacons labeled with a fluorescent dye is achieved in a microfluidic device. The device consists of a four ports mixing chamber, where the probes and the target molecules mix by diffusion. The weak fluorescent signal is detected by two large core optical fibers that are placed on both sides of the channel and collect the light emitted in both directions. The fibers are coupled to a spectrophotometer. The detection limit for the system is 0.2 fmol.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122462275","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
F. Fernández-Morales, J. Samitier, O. Ruiz, J. Bausells, Errachid Abdelhamid
{"title":"Design and simulation of a dielectrophoretic-based microsystem for bioparticle handling","authors":"F. Fernández-Morales, J. Samitier, O. Ruiz, J. Bausells, Errachid Abdelhamid","doi":"10.1109/MMB.2000.893821","DOIUrl":"https://doi.org/10.1109/MMB.2000.893821","url":null,"abstract":"Nowadays, handling of biological objects at the single-cell level is one of the most active and important research fields. To achieve this goal dimensions of the required tools must roughly match those of the bioparticles at issue, usually ranging from 1 to 100 /spl mu/m. The objective of this paper consists of presenting a microsystem designed for particle microhandling. Some results with polystyrene microspheres are also presented. The operating principle of the aforementioned microsystem hinges upon dielectrophoresis (DEP), which is defined as the lateral motion of electrically neutral matter under the influence of non-uniform electric fields. In practice, the device was fabricated on a silicon substrate onto which interdigitated castellated microelectrodes made of platinum were patterned by lift-off. Moreover, the substrate was micromachined utilising TMAH to anisotropically etch the silicon wafer. Microchamber walls were patterned by PDMS, a photocurable resin which allows a constant sample volume when performing the experiments.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125174429","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
D. Tanase, J. Goosen, P.J. Trimp, J. Reekers, P. French
{"title":"Catheter navigation system for intravascular use","authors":"D. Tanase, J. Goosen, P.J. Trimp, J. Reekers, P. French","doi":"10.1109/MMB.2000.893780","DOIUrl":"https://doi.org/10.1109/MMB.2000.893780","url":null,"abstract":"Minimally invasive intravascular interventions are performed with the aid of guide wires and catheters. When inserted into the cardiovascular system, the location of these tools is monitored using X-ray imaging techniques. However, a high radiation dose during the medical procedures, creates an important health risk for clinicians and assistant. In order to reduce the radiation dose, a relevant X-ray image is taken during the medical intervention and is augmented, at successive moments during the procedure, with a virtual indicator for the position and orientation of the guide wire tip. The location of the tip is determined by means of an electromagnetic system, composed of coils, outside the patient, and a three-dimensional sensor on the tip of the guide wire. This way, the need to continuously use radiation is eliminated. Furthermore, the standard intravascular procedure is not changed and the cost of the system is kept low.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125181498","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. Tvarozek, G. Krausko, R. Záhorec, I. Novotný, V. Rehacek
{"title":"Monitoring of the aggregation phase of erythrocyte sedimentation rate by impedance method on micrometric scale","authors":"V. Tvarozek, G. Krausko, R. Záhorec, I. Novotný, V. Rehacek","doi":"10.1109/MMB.2000.893811","DOIUrl":"https://doi.org/10.1109/MMB.2000.893811","url":null,"abstract":"The monitoring of the early stage of red blood cells sedimentation by an impedance method using a thin-film interdigitated array of microelectrodes (IDAE) is described. Time dependences of impedance |Z| exhibit maxima which are shifted to the shorter time period for cancer blood samples in comparison with inflammatory ones. Also the impedance rates (time derivate of impedance |Z|) were higher in cancer samples of blood. The sensitivity of this method was getting greater with both the decrease of the IDAE characteristic dimensions from 400 /spl square/m down to 5 /spl square/m and an increase of temperature from 18/spl deg/C up to 37/spl deg/C.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125537931","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Schwarz, L. Ewe, N. Hijazi, B. Hosticka, J. Huppertz, S. Kolnsberg, W. Mokwa, H. Trieu
{"title":"Micro implantable visual prostheses","authors":"M. Schwarz, L. Ewe, N. Hijazi, B. Hosticka, J. Huppertz, S. Kolnsberg, W. Mokwa, H. Trieu","doi":"10.1109/MMB.2000.893826","DOIUrl":"https://doi.org/10.1109/MMB.2000.893826","url":null,"abstract":"Two micro implantable visual prosthesis systems for blind patients are described. The first system is a retina implant which is based on an implantable microelectrostimulator applicable for patients suffering from retinitis pigmentosa or macula degeneration, and has been already successfully tested in animal experiments. The second system is an intraocular vision aid based on an implantable intraocular optoelectronic display encapsulated into an silicone diaphragm which is applicable for patients suffering from bilateral corneal opacification but with intact posterior ocular segment. Both systems employ wireless power and data transmission using an 13 MHz RF-link for power transmission and either ASK modulation of the RF-carrier or an near IR optical link for data transmission from an external image acquisition and telemetry unit to both implantable micro devices.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129602108","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
R. Scheidt, J. Santini, A. C. Richards, A. M. Johnson, A. Rosenberg, M. Cima, R. Langer
{"title":"Microchips as implantable drug delivery devices","authors":"R. Scheidt, J. Santini, A. C. Richards, A. M. Johnson, A. Rosenberg, M. Cima, R. Langer","doi":"10.1109/MMB.2000.893831","DOIUrl":"https://doi.org/10.1109/MMB.2000.893831","url":null,"abstract":"A microchip has been designed for use as an implantable drug delivery device. Each dosage of drug is contained in an individually addressable microreservoir. This device has no moving parts, but instead relies on an electrochemical reaction to remove the gold cap off of a reservoir. After the cap is removed, the active substance inside the well is free to dissolve or diffuse into the surrounding solution. The performance of the device in phosphate buffered saline and calf serum has been evaluated using the release of fluorescent dye. The electrochemical and release kinetics are slower in serum than in saline, but pulsatile release was achieved in both media.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124617995","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
A. Abdelghani, C. Abdelghani, G. Chmel, E. Sackmann
{"title":"Phase contrast microscopy on cultured endothelial cells as alarm system for toxic agents","authors":"A. Abdelghani, C. Abdelghani, G. Chmel, E. Sackmann","doi":"10.1109/MMB.2000.893739","DOIUrl":"https://doi.org/10.1109/MMB.2000.893739","url":null,"abstract":"The authors cultured endothelial cell monolayer from umbilical cord on biofunctionalized glass substrate. They characterize the density of the cell monolayers with phase contrast microscopy which is particularly suited to the examination of living cells, tissues and micro-organisms. The authors investigate the effect of thrombin on endothelial cell monolayers with the same technique. They find that the endothelial cells began to shrink after adding 0.1 U/ml thrombin. They show that the shrinkage of the endothelial cells in a confluent monolayer first resulted in gap formation between the cells.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128889713","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Development of small size data logger to observe marine animals","authors":"H. Muramoto, Y. Naito","doi":"10.1109/MMB.2000.893757","DOIUrl":"https://doi.org/10.1109/MMB.2000.893757","url":null,"abstract":"By using a data loggers attached to a marine animal, it is possible to obtain information directly about behavior and physiology of the animal. Here, the authors describe these data loggers. Because the data logger must not hinder the animal, it should be as small and lightweight as possible. Depending on the sensors that are built-in, the data logger is capable of recording the following variables: (a) environmental temperature and the animal's body temperature; (b) the water depth; (c) swimming speed; (d) illuminance; (e) acceleration; (f) terrestrial magnetism; (g) EKG; and (h) image. The authors successfully obtained data on swimming depth, water temperature, core body temperature, swim velocity, heart rate and other processes from marine mammals, diving birds, reptiles and fishes.","PeriodicalId":141999,"journal":{"name":"1st Annual International IEEE-EMBS Special Topic Conference on Microtechnologies in Medicine and Biology. Proceedings (Cat. No.00EX451)","volume":"94 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2000-10-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126846721","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}