Controlling trapping potentials and stray electric fields in a microfabricated ion trap through design and compensation

Recent advances in quantum information processing with trapped ions have demonstrated the need for new ion trap architectures capable of holding and manipulating chains of many (>10) ions. Here we present the design and detailed characterization of a new linear trap, microfabricated with scalable complementary metal-oxide-semiconductor (CMOS) techniques, that is well-suited to this challenge. Forty-four individually controlled DC electrodes provide the many degrees of freedom required to construct anharmonic potential wells, shuttle ions, merge and split ion chains, precisely tune secular mode frequencies, and adjust the orientation of trap axes. Microfabricated capacitors on DC electrodes suppress radio-frequency pickup and excess micromotion, while a top-level ground layer simplifies modeling of electric fields and protects trap structures underneath. A localized aperture in the substrate provides access to the trapping region from an oven below, permitting deterministic loading of particular isotopic/elemental sequences via species-selective photoionization. The shapes of the aperture and radio-frequency electrodes are optimized to minimize perturbation of the trapping pseudopotential. Laboratory experiments verify simulated potentials and characterize trapping lifetimes, stray electric fields, and ion heating rates, while measurement and cancellation of spatially-varying stray electric fields permits the formation of nearly-equally spaced ion chains.Comment: 17 pages (including references), 7 figure

Quantum Simulation of Spin Models on an Arbitrary Lattice with Trapped Ions

A collection of trapped atomic ions represents one of the most attractive platforms for the quantum simulation of interacting spin networks and quantum magnetism. Spin-dependent optical dipole forces applied to an ion crystal create long-range effective spin-spin interactions and allow the simulation of spin Hamiltonians that possess nontrivial phases and dynamics. Here we show how appropriate design of laser fields can provide for arbitrary multidimensional spin-spin interaction graphs even for the case of a linear spatial array of ions. This scheme uses currently existing trap technology and is scalable to levels where classical methods of simulation are intractable.Comment: 5 pages, 4 figure

Tetrangomycin from Streptomyces stramineus CAH29 and its antimicrobial and cytotoxic activities

Abstract Not Availabl

Tetrangomycin from Streptomyces stramineus CAH29 and its antimicrobial and cytotoxic activities

Abstract Not Availabl

A brief study on hematological, sero-biochemical and microbiological results of umbilical lesions in calves

This study aimed to evaluate some hematologic, sero-biochemical parameters and microbiological culture results of umbilical lesions in calves. Holstein breed, six calves (n=6) at different age were presented with the complaint of umbilical lesions at different times. Clinical parameters of the cases were recorded, and umbilical lesions were diagnosed following to clinical and ultrasonographical examinations. The encountered pathologies were omphaloarteritis and omphalourachitis in three cases, omphalophlebitis in a case, ulcerous omphalitis in a case and omphalophlebitis and polyarthritis in a case. Peripheral blood samples were collected and then some hematological and sero-biochemical parameters were analyzed. The microbiological samples were taken from umbilical lesions for culture. Blood sample analyses revealed the systemic inflammatory response syndrome and microbiological culture results pointed out enteric bacteria (Escherichia coli, Proteus spp., Pseudomonas putida, Pseudomonas stutzeri, Providencia stuartii, Proteus mirabilis). As a conclusion, it may be emphasized that a brief hematological, serobiochemical evaluation as well as local microbiological culture results of the umbilical lesions have valuable information both determination of the prognosis and evaluation of the healthy status of the calves

Low perfusion index affects the difference in glucose level between capillary and venous blood

Nurdan Acar,1 Hamit Ozcelik,1 Arif Alper Cevik,1 Engin Ozakin,1 Goknur Yorulmaz,2 Nur Kebapci,2 Ugur Bilge,3 Muzaffer Bilgin4 1Emergency Department, 2Endocrinology Department, 3Family Medicine Department, 4Biostatistics Department, Medical School, Eskisehir Osmangazi University, Eskisehir, Turkey Aim: In emergency cases, finger stick testing is primarily used to check the blood glucose value of patients since it takes longer to obtain the venous value. In critical patients, under conditions that cause an increase in metabolic state and level of stress, there occurs considerable difference in glucose levels between capillary and venous measurements. This study aimed to investigate the comparability of capillary and venous glucose values, according to the perfusion index level obtained with the Masimo Radical-7® device, in critical patients aged 18 years and over.Method: We conducted this prospective and observational study in the emergency department of the Eskisehir Osmangazi University hospital between November 3, 2008 and February 2, 2009.Results: The blood glucose of 300 critical patients was checked by finger stick in the emergency unit. The participants with normal vital signs had perfusion index between 0 and 5; the results obtained by the two methods were more consistent for perfusion index values of 6 and over. The results were most consistent in aged participants with normal vital sign findings and low perfusion index and in young patients with high perfusion index. In the cases where at least one of the vital signs was abnormal, the glucose values obtained by the two methods were more consistent when the perfusion index was 6 or over. In this group, independently from the perfusion index value, the consistency was higher in younger patients compared with aged patients.Conclusion: In the emergency department, perfusion index value measured by Masimo Radical-7 and capillary blood glucose levels can serve in blood sugar management in critically ill patients. Keyword: glucose, capillary, venous, perfusion index, Masimo Radical-7&reg