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  • Data  (53)
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  • 1
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    Methamphetamine Use Associated with Non-adherence to Antiretroviral Treatment in Men Who Have Sex with Men (2020)
    Springer Nature
    Details
    Publication Date: 2020-04-28
    Electronic ISSN: 2045-2322
    Topics: Natural Sciences in General
    Published by Springer Nature
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    PAPER CURRENT
  • 2
    Electronic Resource
    Electronic Resource
    Total synthesis of ostopanic acid, a plant cytotoxin via cyclopropanation of 2-N-hexylfuran (1989)
    s.l. : American Chemical Society
    The @journal of organic chemistry 54 (1989), S. 5126-5128 
    Details
    ISSN: 1520-6904
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/jo00282a031
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Phase Transformation during Plasma Spraying of Hydroxyapatite–10-wt%-Zirconia Composite Coating (2002)
    Westerville, Ohio : American Ceramics Society
    Journal of the American Ceramic Society 85 (2002), S. 0 
    Details
    ISSN: 1551-2916
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Notes: This study aims to explore phase transformation in plasma-sprayed hydroxyapatite (HA) + 10 wt% ZrO2–8-mol%-Y2O3composite coating, using separately prepared HA and ZrO2–8-mol%-Y2O3coatings as a control. Changes in the phase and chemistry of the coatings are characterized by X-ray diffractometry, with lattice-constant measurement (Cohen's method), and by transmission electron microscopy. Experimental results show evidence of diffusion, in the liquid state, of calcium ions from the HA matrix into the ZrO2. This behavior causes the formation of the following structural features in the composite coating: (i) a CaO-doped ZrO2solid solution (ZrO2–7.7 mol% Y2O3–4.4 mol% CaO); (ii) a mixture of ZrO2and CaZrO3having a crystal-orientation relationship; (iii) an amorphous phase containing elements of calcium, phosphorus, zirconium, and yttrium; and (iv) a remaining CaO-poor HA matrix (Ca10−x(HPO4)x(PO4)6−x(OH)2−x; x= 0.06). Rationales for the greatly decreased impurity phases of CaO and Ca4P2O9found in the composite coating are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1151-2916.2002.tb00147.x
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  • 4
    Electronic Resource
    Electronic Resource
    Direct writing of silicon gratings with highly coherent ultraviolet laser (1997)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 71 (1997), S. 2442-2444 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Silicon gratings with periods from 180 to 550 nm were fabricated with a laser ablation technique in which the interference fringe from an intense and coherent ultraviolet laser at 266 nm directly melted silicon surface. The scanning electron microscopy and atomic force microscopy pictures showed that the corrugations were in quite good quality with the depth as large as 70 nm. The measurement of grating period dependence on temperature showed that rapid thermal annealing could release the thermal strains, which were built during the melting and cooling process in laser ablation, and make the grating period variation more regular. Also, with an air gap between the sample and prism surfaces, the fabricated gratings had weaker thermal strains and more regular temperature dependencies. All the measurement results of temperature dependence were consistent with theoretical predictions. © 1997 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.120447
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  • 5
    Electronic Resource
    Electronic Resource
    Isolation of 3 salt-induced low-abundance cDNAs from light-grown callus of Mesembryanthemum crystallinum by suppression subtractive hybridization (2000)
    Copenhagen : Munksgaard International Publishers
    Physiologia plantarum 110 (2000), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: A technique combining suppression polymerase chain reaction with suppression subtractive hybridization was used to clone low-abundance transcripts that showed enhanced expression during salt stress in light-grown callus of Mesembryanthemum crystallinum L., the ice plant. Three salt-induced cDNAs were selected by the prolonged film exposure time when analyzed by northern blotting. All of them showed different response kinetics to 200 mM NaCl, but were all expressed at increased levels in the presence of high salts at the cellular level. Analysis of nucleic acid and deduced amino acid sequences of these cDNAs revealed that they encoded a protein involved in K+ uptake (suppressor of K+ transport growth defect [SKD1]), an enzyme in the ubiquitin-mediated proteolytic cycle (ubiquitin-conjugating enzyme [UBC]; EC 6.3.2.19), and a low-molecular mass basic stress-induced protein. The SKD1-like gene was constitutively expressed in the root and up-regulated in the leaf upon salt stress. The levels of other two transcripts remained relatively unchanged in the leaf and increased in the root by high salt. The possible roles of these gene products in the mechanism of salt tolerance in this halophyte are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.2000.1100315.x
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  • 6
    Electronic Resource
    Electronic Resource
    Effects of doping with La and Mn on the crystallite growth and phase transition of BaTiO3 powders (1996)
    Springer
    Journal of materials science 31 (1996), S. 2417-2424 
    Details
    ISSN: 1573-4803
    Source: Springer Online Journal Archives 1860-2000
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Abstract The effects of La and Mn dopants on the crystallite growth and the phase transformation of BaTiO3 powders were studied. The barium titanate powders were obtained by calcining barium titanyl oxalate tetrahydrate in the temperature range 800 to 1200 °C. Crystallite growth of BaTiO3 powders was promoted by the use of Mn dopant due to the increase of oxygen vacancies. The dissolution of La dopant into BaTiO3 structure may decrease the oxygen vacancies so that the growth of BaTiO3 crystallites is inhibited at high temperature (⩾ 900 °C). When the crystallite size is small, the barium titanate can exist as a cubic phase due to the manifestation of the surface energy. Undoped cubic BaTiO3 powders can be stable at a size 〈 30 nm. Doping with La and Mn would bring the crystallite size for the cubic-to-tetragonal phase transformation to ∼ 100 nm, resulting from the presence of cation or oxygen vacancies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01152955
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  • 7
    Electronic Resource
    Electronic Resource
    Antihypertensive and hypolipidemic effects of DC-015, a novel, potent and specific α1-adrenoceptor antagonist: Comparison with prazosin in spontaneously hypertensive rats (1996)
    Springer
    Journal of biomedical science 3 (1996), S. 108-116 
    Details
    ISSN: 1423-0127
    Keywords: α1-Adrenoceptor antagonist ; DC-015 ; Prazosin ; Hypotensive effect ; Hyperlipidemia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The hypotensive effect of DC-015, a newly synthesized quinazoline derivative, was investigated and compared with prazosin in spontaneously hypertensive rats (SHR). Intravenous administration of DC-015 and prazosin (both at 0.01, 0.05 and 0.1 mg/kg) induced a dose-dependent reduction of mean arterial pressure (MAP) which reached a maximal effect at 5 min after injection and persisted over 2 h in SHR. Furthermore, at higher doses DC-015 (0.1 mg/kg i.v. and 2.0 mg/kg orally, respectively) did not cause any significant changes in heart rate (HR); whereas the same doses of prazosin (0.1 mg/kg i.v. and 2.0 mg/kg orally, respectively) produced a decrease in HR which seems to parallel the time course of the hypotensive response in SHR. DC-015 and prazosin attenuated pressor responses to phenylephrine (10 µg/kg) but failed to inhibit the pressor effects of angiotensin II (0.5 µg/kg) even at the maximal hypotensive dose (0.1 mg/kg). This observation indicates that DC-015 appears to exert its hypotensive effect through α1-adrenoceptor blockade. On the other hand, in SHR fed a high-fat-high-cholesterol (HF-HC) diet, oral administration of DC-015 and prazosin (both at 1.0 mg/kg, twice a day) for 4 weeks caused significant reductions in total plasma cholesterol (CE), low-density lipoprotein (LDL)-cholesterol and total plasma triglyceride (TG). DC-015 therapy also increased high-density lipoprotein (HLD)-cholesterol levels, thus the ratio of total plasma cholesterol to HDL-CE was improved. In contrast, prazosin did not significantly increase the HDL-CE level in this study. It is concluded that DC-015 decreased MAP, plasma CE, LDL-CE, plasma TG and increased HDL-CE levels. DC-015 may have therapeutic potential as a potent antihypertensive drug via the α1-adrenoceptor antagonist. Concurrently, DC-015 may thus hold some advantage for the reduction of two of the major risk factors, hypertension and hyperlipidemia, for cardiovascular diseases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02255538
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  • 8
    Electronic Resource
    Electronic Resource
    Effect of the Adhesive Mass at the Cantilever Beam Tip Position (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 773-778 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This study employs finite element simulations to investigate the relationship between theequivalent mass and the real mass of end masses adhered to the tip of the cantilever beam of anatomic force microscope. The equivalent mass was determined by analyzing the variation in theresonant frequency of the cantilever beam caused by the addition of the end mass. The analysisconsidered five different adhesive mass materials, namely copper, aluminum, S45C steel, titaniumalloy and magnesium alloy. Furthermore, the analysis also considerd the effect of the position of theadhesive mass on its equivalent mass value. The numerical results indicate that the equivalentadhesive mass is less than the real adhesive mass. The ratio of the equivalent adhesive mass to thereal adhesive mass is approximately constant for a given adhesive position and adhesive materialand has a value of approximately 0.6361 for a high-density material. Finally, the results show thatan offset of the adhesive mass from the tip position causes a slight change in the value of theequivalent mass to real mass ratio
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.773.pdf
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  • 9
    Electronic Resource
    Electronic Resource
    Determining the Thickness and Refractive Index of a Birefringence by Using an Improved Accurate Measurement System (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 364-366 (Dec. 2007), p. 510-515 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: This paper presents a high-precision, non-destructive measurement system fordetermining the thickness and refractive indices of birefringent optical wave plates. Significantly,the proposed method enables the two refractive indices of the optical sample to be measuredsimultaneously. The performance of the proposed system is verified using a commercial quartzoptical wave plate with known refractive indices of 1.5518 e n = and 1.5427 o n = , respectively, anda thickness of 452.1428 μm. The experimentally determined values of the refractive indices arefound to be 1.55190 e n = and 1.54281 o n = , respectively, while the thickness is found to be 452.189μm, corresponding to an experimental error of approximately 0.046 μm. The measurementresolution of the proposed system exceeds that of the interferometer hardware itself and provides asimple yet highly accurate means of measuring the principal optical parameters of birefringent glasswave plates
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/56/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.364-366.510.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Efficient Algorithms for Interface Timing Verification (1998)
    Springer
    Formal methods in system design 12 (1998), S. 241-265 
    Details
    ISSN: 1572-8102
    Keywords: timing verification ; microprocessor bus ; linear and max constraints
    Source: Springer Online Journal Archives 1860-2000
    Topics: Computer Science
    Notes: Abstract This paper presents algorithms for computing separations between events that are constrained to obey prespecified relationships in their relative time of occurrence. The algorithms are useful for interface timing verification, where event separations are checked against timing requirements. The first algorithm computes separations when only linear and max constraints exist. The algorithm must converge to correct maximum separation values in a finite number of steps, or report an inconsistence of the constraints, irrespective of the existence of infinite constraint bounds or infinite event separations. It is conjectured to run in $$O(VE + V^2 {\text{ log }}V)$$ time, where V is the number of events, and E is the number of relationships between them. The other algorithms extend the first, and compute event separations in the NP-complete version of the problem where min constraints exist. Experiments demonstrate the algorithms are efficient in practice.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008680300467
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