Chrencik, MBA, CPA President and Chief Executive Officer University of Maryland Medical System Robert Chrencik has been the president and CEO of the University of Maryland Medical System since 2008. The Master of Public Health (MPH) Program is a professional degree program that is administratively based in the Department of Epidemiology and Public Health within the School of Medicine at the University of Maryland, Baltimore (UMB). Accredited by the Council. University of Maryland School of Medicine. Dental Hygiene - University of Maryland School of Dentistry. Dental Hygiene Program. The University of Maryland School of Dentistry, Division of Dental Hygiene offers undergraduate programs which lead to the Bachelor of Science degree. Two types of students are admitted to this program: 1) Bachelor of Science or Baccalaureate degree seeking students who have completed two years of pre- professional course work; and 2) Degree Completion students who are Registered Dental Hygienists (RDHs) and are graduates of associate degree or certificate Dental Hygiene programs who wish to complete the course work to obtain the Bachelor of Science degree. Master's in Public Health Program at the UM School of Medicine's Department of Epidemiology and Public Health for BS degree hygienists who wish to earn a master's degree. The University is proud to announce a partnership between the Dental Hygiene Program and the Master's of Public Health program here at UMB for an accelerated BSDH to MPH program. Students interested in obtaining a master's degree can . The School of Dentistry has the dual distinction of being the first dental college in the world and a recognized leader in scholarship, research and service. Dental hygiene students and dental students work together to provide patient care and participate in ongoing research and community service programs. An outstanding clinical education program- featuring patient- centered and student- centered general practices simulates the responsibilities of a dental practice. Dental students and dental hygiene students provide comprehensive patient care under the supervision of clinical faculty. Small class sizes, modern clinical facilities, an innovative curriculum and faculty members who care all characterize the Dental Hygiene Program. Unlock the power of a masters in public health. Kaplan University offers an online MPH degree program. What are the Career Opportunities? With a Master of Public Health from Kaplan University, you could be prepared to pursue a wide range of industry.Online education is increasing in popularity, and the Masters of Public Health degree is no exception. According to the Bureau of Labor Statistics Occupational Outlook Handbook, the average projected job growth rate between 2012-2022 is 11% for all professions. As part of an urban medical center campus, the School of Dentistry attracts a diverse patient population. Its downtown Baltimore location makes the school a convenient source of dental care for city residents and those who work nearby. The School of Dentistry logs more than 1. The overall goal of the Dental Hygiene Program is to prepare graduates who will become the leaders in the profession of dental hygiene.
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Liquid crystal - Wikipedia. Liquid crystals (LCs) are matter in a state which has properties between those of conventional liquids and those of solid crystals. There are many different types of liquid- crystal phases, which can be distinguished by their different optical properties (such as birefringence). When viewed under a microscope using a polarized light source, different liquid crystal phases will appear to have distinct textures. The contrasting areas in the textures correspond to domains where the liquid- crystal molecules are oriented in different directions. Templated synthesis of ZnSe nanostructures using. Within a domain, however, the molecules are well ordered. LC materials may not always be in a liquid- crystal phase (just as water may turn into ice or steam). Liquid crystals can be divided into thermotropic, lyotropic and metallotropic phases. Thermotropic and lyotropic liquid crystals consist mostly of organic molecules, although a few minerals are also known. Thermotropic LCs exhibit a phase transition into the liquid- crystal phase as temperature is changed. Lyotropic LCs exhibit phase transitions as a function of both temperature and concentration of the liquid- crystal molecules in a solvent (typically water). Metallotropic LCs are composed of both organic and inorganic molecules; their liquid- crystal transition depends not only on temperature and concentration, but also on the inorganic- organic composition ratio. Examples of liquid crystals can be found both in the natural world and in technological applications. Most contemporary electronic displays use liquid crystals. Lyotropic liquid- crystalline phases are abundant in living systems but can also be found in the mineral world. For example, many proteins and cell membranes are liquid crystals. Other well- known examples of liquid crystals are solutions of soap and various related detergents, as well as the tobacco mosaic virus, and some clays. History. Previously, other researchers had observed distinct color effects when cooling cholesterol derivatives just above the freezing point, but had not associated it with a new phenomenon. Reinitzer perceived that color changes in a derivative cholesteryl benzoate were not the most peculiar feature. He found that cholesteryl benzoate does not melt in the same manner as other compounds, but has two melting points. The phenomenon is reversible. Seeking help from a physicist, on March 1. Otto Lehmann, at that time a Privatdozent in Aachen. They exchanged letters and samples. Lehmann examined the intermediate cloudy fluid, and reported seeing crystallites. Reinitzer's Viennese colleague von Zepharovich also indicated that the intermediate . The exchange of letters with Lehmann ended on April 2. Keywords: Hexagonal liquid crystal CdS Nanowire Synthesis template Received: 1998-09-18 Accepted: 1998-10-28. Direct in Situ Observation of Nanoparticle Synthesis in a Liquid Crystal. Here we show the first direct observation of nanoparticle synthesis in a liquid crystal surfactant template using an electron. Controlled synthesis of nanostructures is essential for many applications, from energy storage/generation and catalysis to semiconductor and biomedical devices. Normally, nanostructures are characterized after synthesis and. Reinitzer presented his results, with credits to Lehmann and von Zepharovich, at a meeting of the Vienna Chemical Society on May 3, 1. The research was continued by Lehmann, who realized that he had encountered a new phenomenon and was in a position to investigate it: In his postdoctoral years he had acquired expertise in crystallography and microscopy. Lehmann started a systematic study, first of cholesteryl benzoate, and then of related compounds which exhibited the double- melting phenomenon. He was able to make observations in polarized light, and his microscope was equipped with a hot stage (sample holder equipped with a heater) enabling high temperature observations. The intermediate cloudy phase clearly sustained flow, but other features, particularly the signature under a microscope, convinced Lehmann that he was dealing with a solid. By the end of August 1. Zeitschrift f. However, liquid crystals were not popular among scientists and the material remained a pure scientific curiosity for about 8. George William Gray, a prominent researcher of liquid crystals, began investigating these materials in England in the late 1. His group synthesized many new materials that exhibited the liquid crystalline state and developed a better understanding of how to design molecules that exhibit the state. His book Molecular Structure and the Properties of Liquid Crystals. Brown, starting in 1. University of Cincinnati and later at Kent State University. In 1. 96. 5, he organized the first international conference on liquid crystals, in Kent, Ohio, with about 1. This conference marked the beginning of a worldwide effort to perform research in this field, which soon led to the development of practical applications for these unique materials. This led his colleague George H. Heilmeier to perform research on a liquid crystal- based flat panel display to replace the cathode ray vacuum tube used in televisions. But the para- Azoxyanisole that Williams and Heilmeier used exhibits the nematic liquid crystal state only above 1. A material that could be operated at room temperature was clearly needed. In 1. 96. 6, Joel E. Goldmacher and Joseph A. Castellano, research chemists in Heilmeier group at RCA, discovered that mixtures made exclusively of nematic compounds that differed only in the number of carbon atoms in the terminal side chains could yield room- temperature nematic liquid crystals. A ternary mixture of Schiff base compounds resulted in a material that had a nematic range of 2. This technique of mixing nematic compounds to obtain wide operating temperature range eventually became the industry standard and is used to this very day to tailor materials to meet specific applications. In 1. 96. 9, Hans Kelker succeeded in synthesizing a substance that had a nematic phase at room temperature, MBBA, which is one of the most popular subjects of liquid crystal research. Since then, two new types of LC molecules have been discovered, both man- made: disc- shaped (created by S. Chandrasekhar's group in India, 1. Despite significant differences in chemical composition, these molecules have some common features in chemical and physical properties. There are three types of thermotropic liquid crystals: discotics, bowlics and rod- shaped molecules. Discotics are flat disc- like molecules consisting of a core of adjacent aromatic rings; the core in a bowlic is not flat but like a rice bowl (a three- dimensional object). Rod- shaped molecules have an elongated, anisotropic geometry which allows for preferential alignment along one spatial direction. Low- temperature mesomorphic behavior in general is technologically more useful, and alkyl terminal groups promote this. An extended, structurally rigid, highly anisotropic shape seems to be the main criterion for liquid crystalline behavior, and as a result many liquid crystalline materials are based on benzene rings. One can distinguish positional order (whether molecules are arranged in any sort of ordered lattice) and orientational order (whether molecules are mostly pointing in the same direction), and moreover order can be either short- range (only between molecules close to each other) or long- range (extending to larger, sometimes macroscopic, dimensions). Most thermotropic LCs will have an isotropic phase at high temperature. That is that heating will eventually drive them into a conventional liquid phase characterized by random and isotropic molecular ordering (little to no long- range order), and fluid- like flow behavior. Under other conditions (for instance, lower temperature), a LC might inhabit one or more phases with significant anisotropic orientational structure and short- range orientational order while still having an ability to flow. This order extends up to the entire domain size, which may be on the order of micrometers, but usually does not extend to the macroscopic scale as often occurs in classical crystalline solids. However some techniques, such as the use of boundaries or an applied electric field, can be used to enforce a single ordered domain in a macroscopic liquid crystal sample. The ordering in a liquid crystal might extend along only one dimension, with the material being essentially disordered in the other two directions. If the temperature rise is too high, thermal motion will destroy the delicate cooperative ordering of the LC phase, pushing the material into a conventional isotropic liquid phase. At too low temperature, most LC materials will form a conventional crystal. For instance, on heating a particular type of LC molecule (called mesogen) may exhibit various smectic phases followed by the nematic phase and finally the isotropic phase as temperature is increased. An example of a compound displaying thermotropic LC behavior is para- azoxyanisole. The black color corresponds to isotropic medium. One of the most common LC phases is the nematic. The word nematic comes from the Greek. This term originates from the thread- like topological defects observed in nematics, which are formally called 'disclinations'. Nematics also exhibit so- called . In a nematic phase, the calamitic or rod- shaped organic molecules have no positional order, but they self- align to have long- range directional order with their long axes roughly parallel. Most nematics are uniaxial: they have one axis that is longer and preferred, with the other two being equivalent (can be approximated as cylinders or rods). However, some liquid crystals are biaxial nematics, meaning that in addition to orienting their long axis, they also orient along a secondary axis. Aligned nematics have the optical properties of uniaxial crystals and this makes them extremely useful in liquid crystal displays (LCD). The smectic A phase (left) has molecules organized into layers. In the smectic C phase (right), the molecules are tilted inside the layers. The smectic phases, which are found at lower temperatures than the nematic, form well- defined layers that can slide over one another in a manner similar to that of soap. 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