Índice Alfabético - M Padan, Etana, Michel, Hartmut http://www.biografiasyvidas.com/biografia/m/index0025.htm
Michel, Hartmut Michel, Hartmut (b. July 18, 1948, Ludwigsburg, W.Ger.), German biochemist who, along with Johann Deisenhofer and Robert Huber, received the Nobel Prize for Chemistry in 1988 http://www.uv.es/EBRIT/micro/micro_391_80.html
Extractions: Britannica CD Index Articles Dictionary Help (b. July 18, 1948, Ludwigsburg, W.Ger.), German biochemist who, along with Johann Deisenhofer and Robert Huber , received the Nobel Prize for Chemistry in 1988 for their determination of the structure of certain proteins that are essential for photosynthesis. It was Michel's preliminary work, done in the period from 1978 to 1982, that cleared the way for the three scientists' joint research. They wanted to determine the three-dimensional structure of a four-protein complex (called a photosynthetic reaction centre) that is crucial to the process of photosynthesis in certain bacteria. Michel performed the hitherto impossible feat of reducing the protein complex to a pure crystalline form, thus making it possible to determine the protein's structure atom-by-atom by means of X-ray diffraction techniques.
AccessScience | Biography | Michel, Hartmut About AccessScience. AccessScience is a subscriptionbased website that features continually updated scientific and http://www.accessscience.com/content.aspx?id=M0048102
Hartmut Michel - CIRS MICHEL, HARTMUT. Hartmut.Michel@mpibpfrankfurt.mpg.de. Biochemist, Adjunct Professor of Biochemistry http://www.cirs.net/researchers/Chemistry/MICHEL.htm
Extractions: His group studies the key enzymes of photosynthesis, namely the photosynthetic reaction centre (which is a light-driven electron pump), and of aerobic respiration, namely the cytochrome c oxidase (which is a proton pump). Having completed the structure determinations of the reaction centres from the purple bacterium Rhodopseudomonas viridis and the light-harvesting complex two from a different purple bacterium, Rhodospirillum molischianum (light-harvesting complexes absorb light and transfer its energy to the reaction centres), residual activities of the group in the area of photosynthesis comprise site-directed mutagenesis of the cytochrome subunit of the Rhodopseudomonas viridis reaction centre. This work is aimed to understand the reasons for the alternate order in the cytochrome subunit of high and low potential haem groups, which are involved in the re-reduction of the primary electron donor. The main current objective is to understand the mechanism of action of cytochrome c oxidases, based on an accurately known structure, especially how electron transfer is coupled to proton pumping across the membrane. For the purpose of membrane protein crystallization and subsequent structure determination a novel method consisting in co-crystallization with Fv-fragments of monoclonal antibodies has been developed, and used to crystallize two different cytochrome c oxidase preparations from the soil bacterium Paracoccus denitrificans. After the subsequent structure determination by X-ray crystallography the resulting coordinate set has been used for theoretical calculations, e.g. to study computationally protonation changes upon reduction of cytochrome c oxidase.
Hartmut Michel - Autobiography Nobelprize.org, The Official Web Site of the Nobel Prize http://nobelprize.org/nobel_prizes/chemistry/laureates/1988/michel-autobio.html
Extractions: Home FAQ Press Contact Us ... Nobel Prize in Chemistry Hartmut Michel - Autobiography Sort and list Nobel Prizes and Nobel Laureates Create a List All Nobel Prizes Nobel Prize Awarded Organizations Women Nobel Laureates Nobel Laureates and Universities Prize category: Physics Chemistry Medicine Literature Peace Economics As a child I liked to play outside, to stroll through the fields, and I was an active member of the local children's gang, frequently being chased by field guards and building supervisors. Nevertheless, my performance at school was very good, and mainly due to the influence of my mother I was allowed to attend high school. At age eleven I became a member of the circulating library of my home town. From there on I was rarely seen outside, but was reading two to four books per week, the subjects ranging from archaeology over ethnology and geography to zoology. Needless to say that I did not do much homework. At school my favorite subjects were history, biology, chemistry and physics. Especially the teaching in physics was excellent. Most of my understanding of it I got at high school, not at the university. Frustrated from the lack of the final success with bacteriorhodopsin, I tried to crystallize several other membrane proteins, mainly photosynthetic ones. After developing a new isolation procedure I obtained the first crystals of the photosynthetic reaction centre from the purple bacterium Rhodopseudomonas viridis at the end of July 1981. One week later our daughter Andrea was born. During September 1981 the first reaction centre crystal was X-rayed by Wolfram Bode and myself, and turned out to be of excellent quality. Therefore 1981 was the happiest and most successful year of my life.
Michel, Hartmut Michel, Hartmut. Michel, Hartmut (1948 ), German chemist, co-winner of the 1988 Nobel Prize for Chemistry, with Johann Deisenhofer and Robert Huber, for their work in defining http://www.freegk.com/nobel/Michel.php
Hartmut Michel (German Biochemist) -- Britannica Online Encyclopedia Hartmut Michel (German biochemist), July 18, 1948Ludwigsburg, W.Ger.German biochemist who, along with Johann Deisenhofer and Robert Huber, received the Nobel Prize for Chemistry in http://www.britannica.com/EBchecked/topic/379944/Hartmut-Michel
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Hartmut Michel: Biography From Answers.com German chemist (1948– ) Michel was born at L dwigsburg in Germany and educated at the University of Warburg, where he obtained his PhD in 1977. He moved to the Max Planck http://www.answers.com/topic/michel-hartmut
Extractions: var isReferenceAnswers = true; BodyLoad('s'); On this page Library Scientist: Home Library Science Dictionary of Scientists German chemist (1948– Michel was born at Lüdwigsburg in Germany and educated at the University of Warburg, where he obtained his PhD in 1977. He moved to the Max Planck Institute for Biochemistry at Martinsried, near Munich, and remained there until 1987, when he moved to Frankfurt to head the biophysics division. By 1970 chemists had succeeded in uncovering the basic chemistry of photosynthesis but little was known about the process at the molecular level. It was established that the process occurred in the photosynthetic reaction centers first identified by Roderick Clayton in the late 1960s. These are to be found embedded in the membranes of the photosynthetic vesicles. Within the reaction centers was a complex protein structure. Before further progress could be made, the structure of the proteins would have to be worked out, but first it would be necessary to crystallize the proteins. Michel first tackled the problem in 1978. While it was relatively easy to crystallize water-soluble proteins, membrane proteins, which react with both fats and water, were only partially
Extractions: By Alphabet : Encyclopedia A-Z M Related Category: Biochemistry, Biographies Hartmut Michel u l] Pronunciation Key Huber and Johann Deisenhofer to develop a process that used X-ray technology to determine exactly the structure of such a large molecule. For this innovation the three researchers were awarded the 1988 Nobel Prize in Chemistry. Content on this web site is provided for informational purposes only. We accept no responsibility for any loss, injury or inconvenience sustained by any person resulting from information published on this site. We encourage you to verify any critical information with the relevant authorities. About Us Contact Us Privacy Links Directory ...
Voltage Limiter For Transistor Circuit Michel, Hartmut; Nelle, Ulrich; Mindl, Anton; Bireckoven, Bernd; The invention relates to a voltage limiter for a transistor circuit with http://www.devileye.net/catalog/viscous_lubricant/voltage_limiter_transistor_cir
Extractions: Michel, Hartmut; Nelle, Ulrich; Mindl, Anton; Bireckoven, Bernd; The invention relates to a voltage limiter for a transistor circuit with semiconductors (T.sub.20 and T.sub.21) in the arrangement of a plurality of successive amplifier stages, with a reference element (Zener diode Z.sub.20) and with at least one voltage divider arrangement (voltage divider R.sub.21 /R.sub.22). In accordance with the invention, the reference element (Zener diode Z.sub.20) is disposed downstream of the triggering circuit of the first stage or even closer at the output of the voltage limiter circuit for reducing the oscillation tendency. FIELD OF THE SPECIFICATION A known voltage limiter in an integrated circuit (DE 32 27 536 A1 and corresponding U.S. Pat. No. 4,618,875 FLOHRS), employs a controlled cover ("gate") electrode. The voltage-controlled collector voltage limiter described there corresponds to an MOS (Metal Oxide Semiconductor) structure which is generally endangered by breakdown. It is possible that the temperature compensation is not sufficient and additional process steps in the wafer process are also necessary. Another commonly known voltage limiter in a highly blocking transistor is often formed by connecting the one side of a reference element in the form of a Zener diode to the base of the transistor. With the other side it is connected at the center tap of a voltage divider, one base of which is connected to the emitter of the transistor and the other base of which is connected to the collector of the transistor. The components of such a circuit can be separately constructed or monolithically integrated.
Michel, Hartmut - Personenlexikon Title The Photosynthetic Reaction Center from the Purple Bacterium Rhodopseudomonas viridis Authors Deisenhofer, Johann; Michel, Hartmut Publication http://www.personenlexikon.net/d/michel-hartmut/michel-hartmut.htm
Extractions: Startseite Personenlexikon Thematische Gliederung Gruppen Kategorien ... Z deutscher Biochemiker, geboren 18.7.1948 Ludwigsburg; Professor und ab 1987 Direktor der Abteilung Molekulare Membranchemie am Max-Planck-Institut fr Biophysik in Frankfurt a.M.; Arbeiten ber Kanalproteine, Rezeptoren und Struktur-Funktion-Beziehungen von Membranproteinen; erhielt 1988 zusammen mit J. t Deisenhofer und R. Huber den Nobelpreis fr Chemie fr die Aufklrung der dreidimensionalen Struktur des photosynthetischen Reaktionszentrums von Purpurbakterien, wobei es ihm 1982 gelungen war, das photosynthetische Reaktionszentrum in die kristalline und damit rntgenstrukturanalytisch eruierbare Form zu berfhren; entschlsselte 1995 mit seiner Arbeitsgruppe die Struktur der Cytochrom-c-Oxidase. Diese Seite als Bookmark speichern : addthis_url = location.href; addthis_title = document.title; addthis_pub = 'woorgle1492'; Michaelis, Leonor Michell, John Weitere Begriffe : Bronk, Detlev Wulf
HARTMUT MICHEL - Encyclopédie Universalis Hartmut Michel Vikipedi, zg r ansiklopedi Doğum 18 Temmuz 1948 Ludwigsburg, Almanya (194807-18) Milliyeti Almanya Branşı Biyokimya alıştığı yerler Max Planck http://www.universalis.fr/encyclopedie/hartmut-michel/
Extractions: Encyclopædia Universalis, le portail de la connaissance Accueil Boutique Contact Assistance J'ai oublié mon mot de passe Zone de recherche Saisir un mot clef Biochimiste allemand né le 18 juillet 1948 à Ludwigsburg. Hartmut Michel fait ses études de biochimie à l'université de Tübingen, puis à l'université de Würtzburg, où il obtient son doctorat en 1977. À Tübingen, Michel commence une longue et fructueuse collaboration avec D. Oesterhelt, un spécialiste de bioénergétique et des protéines membranaires. Michel travaille à mettre au point des méthodes pour obtenir ces protéines membranaires sous formes cristallisées. Leur cristallisation est un problème difficile, en raison de la nature en grande partie hydrophobe de leurs structures. Par ailleurs, il ne suffit pas d'obtenir un cristal, encore faut-il que celui-ci soit d'une qualité qui permette d'interpréter les données obtenues par diffraction. Michel va réussir à obtenir assez rapidement de petits cristaux de bactériorhodopsine, une protéine […] … pour nos abonnés, l'article se prolonge sur 1 page…
Extractions: Home Discussion Topics Dictionary ... Login Johann Deisenhofer Discussion Ask a question about ' Johann Deisenhofer Start a new discussion about ' Johann Deisenhofer Answer questions from other users Full Discussion Forum Encyclopedia Johann Deisenhofer (born September 30, 1943) is a German biochemist Biochemist Biochemists are scientists who are trained in biochemistry. Typical biochemists study chemical processes and chemical transformations in living organisms. The prefix of "bio" in "biochemist" can be understood as a fusion of "biological chemist."-Role:... who, along with Hartmut Michel Hartmut Michel Hartmut Michel is a German biochemist and Nobel Laureate.He was born 18 July 1948 in Ludwigsburg. After compulsory military service, he studied biochemistry at the University of Tübingen, working for his final year at Dieter Oesterhelt’s laboratory on ATPase activity of halobacteria.In 1986, he... and Robert Huber Robert Huber Robert Huber is a German biochemist and Nobel laureate.He was born 20 February 1937 in Munich where his father, Sebastian, was a bank cashier. He was educated at the Humanistisches Karls-Gymnasium from 1947 to 1956 and then studied chemistry at the Technische Hochschule, receiving his diploma in 1960... , received the Nobel Prize for Chemistry in 1988 for their determination of the structure of a membrane-bound complex of proteins and co-factors that is essential to photosynthesis Photosynthesis Photosynthesis is a process that converts carbon dioxide into organic compounds, especially sugars, using the energy from sunlight. Photosynthesis occurs in plants, algae, and many species of bacteria, but not in archaea...
