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  • Digitale Medien  (220)
  • 1995-1999  (155)
  • 1970-1974  (65)
  • 1
    Digitale Medien
    Digitale Medien
    New variable low-temperature scanning tunneling microscope for use in ultrahigh vacuum (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2499-2503 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: We describe the design and characterization of a new variable low-temperature scanning tunneling microscope (STM) which has been proven to give atomic resolution at temperatures between 77 K and room temperature but which is also capable of performing experiments as low as 4 K. The STM "head'' itself consists of a unique cold dewar made up of an upper and lower reservoir connected together by two tubes which pass through an 8 in. conflat flange. The STM stage is suspended in between the two reservoirs by three long springs which pass through holes in the upper reservoir and also attach to the top flange. An adjustable cold shroud surrounds the STM stage for radiation shielding while allowing sample and tip transfer when raised. It has the additional advantage of providing a controllable heat leak. By raising the shroud, the temperature can be increased; by lowering it, the temperature can be decreased. The cold reservoirs can be filled with either liquid nitrogen or liquid helium. In the case of liquid helium, an additional liquid nitrogen "jacket'' surrounds the STM head. Everything is operated inside a customized ultrahigh vacuum chamber containing low-energy electron diffraction and various sample preparation facilities. A detailed description of the STM is presented together with performance results. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145647
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  • 2
    Digitale Medien
    Digitale Medien
    A solid state detector for soft energy extended x-ray absorption fine structure measurements : Proceedings of the 5th international conference on synchrotron radiation instrumentation (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 2333-2335 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Following the success of solid state detector systems for extended x-ray absorption fine structure studies at high x-ray energies, there is now an increasing demand for similar devices capable of operating in the soft x-ray energy range below about 3 keV. Recent developments in sophisticated detector fabrication techniques now make the construction of specialized devices, suitable for high quality spectroscopy in this energy range, a practicable proposition. We present the results of extensive testing of a new detector developed specifically for use in the sub-3 keV energy range. We have measured energy resolutions of less than 125 eV full width at half maximum at sulfur and silicon Kα energies and the ability of the detector to achieve this resolution at the copper Lα line has also been shown. Finally we demonstrate the potential of this device in a study of trace dopants in bulk silicon based quantum dot glasses. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1145680
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  • 3
    Digitale Medien
    Digitale Medien
    A new device for injection of iron atoms into plasmas : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 568-570 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: Reduction of indigenous metal impurities in tokamak plasmas and impurity requirements for the x-ray diagnosis of central plasma parameters necessitates artificial introduction of metal atoms. A new inexpensive method is described using ferrocene, Fe(C5H5)2, a substance which sublimes. A prototype device was tested at the Atomic-Beam Facility at PPPL. Ferrocene was injected into a pulsed helium plasma with an electron density of 2×1013 cm−3 and an electron temperature of 5 eV. The injected amount of ferrocene was controlled by varying the sublimation temperature in the range from 70 to 150 °C and adjusting the pulse length of a solenoid valve; the resulting iron atom concentration in the plasma was determined by monitoring the intensity of the Fe line at 5269 A(ring). The device and the test results are presented. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146287
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  • 4
    Digitale Medien
    Digitale Medien
    Studies of He-like krypton for use in determining electron and ion temperatures in very-high-temperature plasmas : Proceedings of the tenth topical conference on high temperature plasma diagnostics (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 761-763 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: High-resolution measurements of the He-like Kr K-shell radiation are presented showing the direct excitation lines as well as Li- and Be-like dielectronic recombination lines appearing in the KLL resonance. The measurements were performed on the Electron Beam Ion Trap (EBIT) facility and motivated by the need for accurate atomic data of high-Z He-like K-shell transitions for diagnostic applications in determining the central ion and electron temperature of very-high-temperature plasmas produced in next-generation tokamaks, such as the International Thermonuclear Experimental Reactor (ITER). © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1146281
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  • 5
    Digitale Medien
    Digitale Medien
    The Globin Fragment LVV-Hemorphin-7 Is an Endogenous Ligand for the AT4 Receptor in the Brain (1997)
    Oxford, UK : Blackwell Science Ltd
    Journal of neurochemistry 68 (1997), S. 0 
    Details
    ISSN: 1471-4159
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: Abstract: Angiotensin IV (Val-Tyr-Ile-His-Pro-Phe) has been reported to interact with specific high-affinity receptors to increase memory retrieval, enhance dopamine-induced stereotypy behavior, and induce c-fos expression in several brain nuclei. We have isolated a decapeptide (Leu-Val-Val-Tyr-Pro-Trp-Thr-Gln-Arg-Phe) from sheep brain that binds with high affinity to the angiotensin IV receptor. The peptide was isolated using 125I-angiotensin IV binding to bovine adrenal membranes to assay receptor binding activity. This peptide is identical to the amino acid sequence 30–39 of sheep βA- and βB-globins and has previously been named LVV-hemorphin-7. Pharmacological studies demonstrated that LVV-hemorphin-7 and angiotensin IV were equipotent in competing for 125I-angiotensin IV binding to sheep cerebellar membranes and displayed full cross-displacement. Using in vitro receptor autoradiography, 125I-LVV-hemorphin-7 binding to sheep brain sections was identical to 125I-angiotensin IV binding in its pattern of distribution and binding specificity. This study reveals the presence of a globin fragment in the sheep brain that exhibits a high affinity for, and displays an identical receptor distribution with, the angiotensin IV receptor. This globin fragment, LVV-hemorphin-7, may therefore represent an endogenous ligand for the angiotensin IV receptor in the CNS.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1046/j.1471-4159.1997.68062530.x
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  • 6
    Digitale Medien
    Digitale Medien
    A COMPARISON OF THE GROWTH OF A CUT SWARD WITH THAT OF GRAZED SWARDS, USING A TECHNIQUE TO ELIMINATE FOULING AND TREADING (1971)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 26 (1971), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: A technique is described whereby sward defoliation by sheep can occur in the absence of treading and the deposition of excreta. By using this technique, swards were grazed to a moderate severitj, leaving behind an amount of herbage similar to that left after cutting; the DM yields from both methods are compared. The technique was also used to study other swards which were grazed either very leniently or very severely. Within the limits tested, efficient rotational grazing (i.e. the removal of a large proportion of the herbage on each occasion) did not give the greatest DM yields, except at the first harvest. Cutting- and grazing-treatments produced differences in sward structure.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1971.tb00658.x
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  • 7
    Digitale Medien
    Digitale Medien
    A TECHNIQUE FOR THE STUDY OF ‘FOULING’ BY GRAZING CATTLE (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Grass and forage science 28 (1973), S. 0 
    Details
    ISSN: 1365-2494
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
    Notizen: The need to isolate defoliation from other influences arising from grazing cattle nsed in experiments has led to the development of a cage which allows cattle to graze, hut protects the sward from treading and the deposition of faeces and nrine. The technique is descrihed and a description given of experimental work on the harvesting of swards in the presence or absence of these other influences.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2494.1973.tb00715.x
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  • 8
    Digitale Medien
    Digitale Medien
    Heat urticaria (1974)
    Oxford, UK : Blackwell Publishing Ltd
    British journal of dermatology 90 (1974), S. 0 
    Details
    ISSN: 1365-2133
    Quelle: Blackwell Publishing Journal Backfiles 1879-2005
    Thema: Medizin
    Notizen: A case is reported of urticaria as a local response to heating the skin. The clinical, pharmacological and immunological features of this rare condition are described.Urticaria as a local response to heating of skin is extremely rare. We describe here a patient with localized heat urticaria, and report some clinical, pharmacological and immunological characteristics of the condition.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1111/j.1365-2133.1974.tb06404.x
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  • 9
    Digitale Medien
    Digitale Medien
    Crystal and molecular structure of bis(cyclopentadienyl)-2,2'-bi-.pi.-allylbis(nickel) (C5H5NiC3H4-C3H4NiC5H5) (1972)
    s.l. : American Chemical Society
    Inorganic chemistry 11 (1972), S. 165-170 
    Details
    ISSN: 1520-510X
    Quelle: ACS Legacy Archives
    Thema: Chemie und Pharmazie
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/ic50107a036
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  • 10
    Digitale Medien
    Digitale Medien
    Quantifying carbohydrate fractions in forage plants (1972)
    s.l. : American Chemical Society
    Journal of agricultural and food chemistry 20 (1972), S. 238-240 
    Details
    ISSN: 1520-5118
    Quelle: ACS Legacy Archives
    Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Werkstoffwissenschaften, Fertigungsverfahren, Fertigung
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1021/jf60180a009
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