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  • 1
    Online Resource
    Online Resource
    Temperaturanpassungen typischer Evertebraten des Helgoländer Felssockels : Abschlußbericht für das BMBF-Projekt (1998)
    [Helgoland : Biologische Anstalt, Abt. Zoologie]
    Details Availability
    Keywords: Forschungsbericht
    Type of Medium: Online Resource
    Pages: 19 p. = 96 kB, text and images
    Edition: [Electronic ed.]
    URL: https://edocs.tib.eu/files/e001/251509001.pdf
    URL: https://edocs.tib.eu/files/e001/251509001l.pdf
    Language: German
    Note: Contract no. BMBF 03F0153A; 03FO153A , nIndex , Differences between the printed and electronic version of the document are possible
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  • 2
    Electronic Resource
    Electronic Resource
    Lattice site location studies of ion implanted 8Li in GaN (1998)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 84 (1998), S. 3085-3089 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The lattice sites of ion implanted Li atoms in GaN were studied as a function of implantation temperature between room temperature and 770 K. We measured the channeling and blocking patterns of α-particles emitted in the radioactive decay of implanted 8Li ions to determine the Li lattice sites. Below 700 K Li atoms occupy mainly interstitial sites in the center of the c-axis hexagons at positions c/4 and 3c/4, where c is the lattice constant in c-axis direction. Around 700 K Li starts to diffuse and presumably interacts with vacancies created in the implantation process. This leads to the formation of substitutional Li above 700 K. An activation energy of about 1.7 eV for interstitial Li diffusion was determined. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.368463
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  • 3
    Electronic Resource
    Electronic Resource
    Provocative Testing in Children with Suspect Congenital Long QT Syndrome (1998)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of noninvasive electrocardiology 3 (1998), S. 0 
    Details
    ISSN: 1542-474X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: This study was designed to evaluate several alternative ECG measurements and provocative tests in order to identify markers for children with suspect congenital long QT syndrome (LQTS).〈section xml:id="abs1-2"〉〈title type="main"〉BackgroundA single QTc measurement on a resting ECG does not identify all children with LQTS. Alternative ECG measurements have been established for identification of LQTS patients, with varied degrees of accuracy. Additionally, findings of QT prolongation during exercise or catecholaminergic stimulation have been suggested as indicators for the presence of LQTS and associated arrhythmias.〈section xml:id="abs1-3"〉〈title type="main"〉MethodsThe ECGs from 40 children with suspect congenital LQTS were compared with 1000 gender and age matched control patients. Complete exercise ECG studies were performed on 32 of the 40 suspect LQTS patients and compared with 29 controls. ECGs recorded during isoproterenol infusion were obtained in 9 suspect LQTS patients and compared with 44 matched control subjects.〈section xml:id="abs1-4"〉〈title type="main"〉ResultsDuring exercise, the QTc was mildly prolonged in both groups, without a similar increase in JTc, suggesting prolongation of depolarization time. QT and JT dispersion shortened with exercise in control subjects, but not in the suspect LQTS patients. During isoproterenol infusion, the QTc and JTc are prolonged in the suspect LQTS group, without an increase in the control patients.〈section xml:id="abs1-5"〉〈title type="main"〉ConclusionsWe describe the ECG findings with provocative testing in patients in whom there is a clinical suspicion of LQTS, yet have a normal or borderline QTc. Exercise or isoproterenol may aid in identification of patients with congenital long QT syndrome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1542-474X.1998.tb00023.x
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  • 4
    Electronic Resource
    Electronic Resource
    Bites and stings of medically important venomous arthropods (1998)
    Oxford, UK : Blackwell Science Ltd
    International journal of dermatology 37 (1998), S. 0 
    Details
    ISSN: 1365-4632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1046/j.1365-4362.1998.00455.x
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  • 5
    Electronic Resource
    Electronic Resource
    High CO2 content of fluid inclusions in gold mineralisations in the Ashanti Belt, Ghana: a new category of ore forming fluids? – a reply (1998)
    Springer
    Mineralium deposita 33 (1998), S. 320-322 
    Details
    ISSN: 1432-1866
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s001260050152
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  • 6
    Electronic Resource
    Electronic Resource
    NAD-dependent malate dehydrogenase and glyceraldehyde 3-phosphate dehydrogenase isoenzymes play an important role in dark metabolism of various plastid types (1998)
    Springer
    Planta 205 (1998), S. 359-366 
    Details
    ISSN: 1432-2048
    Keywords: Key words:Capsicum (fruit plastids) ; Dark metabolism ; Glyceraldehyde 3-phosphate dehydrogenase ; Malate dehydrogenase ; Malate valve ; Spinacia (chloroplasts)
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract. Chloroplasts isolated from spinach (Spinacia oleracea L.) leaves and green sweet-pepper (Capsicum annuum L. var. grossum (L.) Sendt.) fruits contain NADP-dependent malate dehydrogenase (MDH; EC 1.1.1.82) and the bispecific NAD(P)-glyceraldehyde 3-phosphate dehydrogenase (GAPDH; EC 1.2.1.13). The NADP-dependent MDH and GAPDH are activated in the light, and inactive in the dark. We found that chloroplasts possess additional NAD-dependent MDH activity which is, like the NAD-dependent GAPDH activity, not influenced by light. In heterotrophic chromoplasts from red sweet-pepper fruits, the NADP-dependent MDH and the NAD(P)-GAPDH isoenzymes disappear during the developmental transition and only NAD-specific isoforms are found. Spinach chloroplasts contain both NAD/H and NADP/H at significant concentrations. Measurements of the pyridine dinucleotide redox states, performed under dark and various light conditions, indicate that NAD(H) is not involved in electron flow in the light. To analyze the contribution of NAD(H)-dependent reactions during dark metabolism, plastids from spinach leaves or green and red sweet-pepper fruits were incubated with dihydroxyacetone phosphate (DHAP). Exogenously added DHAP was oxidized into 3-phosphoglycerate by all types of plastids only in the presence of oxaloacetate, but not with nitrite or in the absence of added electron acceptors. We conclude that the NAD-dependent activity of GAPDH is essential in the dark to produce the ATP required for starch metabolism; excess electrons produced during triose-phosphate oxidation can selectively be used by NAD-MDH to form malate. Thus NADPH produced independently in the oxidative pentose-phosphate pathway will remain available for reductive processes inside the plastids.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s004250050331
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  • 7
    Electronic Resource
    Electronic Resource
    Sulfur contents and sulfur-isotope compositions of thiotrophic symbioses in bivalve molluscs and vestimentiferan worms (1998)
    Springer
    Marine biology 132 (1998), S. 453-460 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Total sulfur (STOT), elemental sulfur (S°) and sulfur-isotope compositions (δ34S) of marine animals were analyzed to determine whether these chemical characteristics could help distinguish animals with a sulfur-based, thiotrophic nutrition from animals whose nutrition is based on methanotrophy or on more normal consumption of phytoplankton-derived organic matter. The presence of S° was almost entirely confined to the symbiont-containing tissues of thiotrophs, but was sometimes undetectable in thiotrophic species where sulfide availability was probably low. When S° contents were subtracted, the remaining tissue-sulfur concentrations were similar for all nutritional groups. δ34S values were typically lower for thiotrophs than for other groups, although there was overlap in methanotroph and thiotroph values at some sites. Field evidence supported the existence of small to moderate (1 to 10‰)34S fractionations in the uptake of sulfides and metabolism of thiosulfate. In general, a total sulfur content of 〉3% dry weight, the presence of elemental sulfur, and δ34S values less than +5‰ can be used to infer a thiotrophic mode of nutrition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002270050411
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  • 8
    Electronic Resource
    Electronic Resource
    Harmonic composition of synchrotron white-beam X-ray topographic back-reflection images of basal-cut silicon carbide single-crystal wafers (1998)
    Copenhagen : International Union of Crystallography (IUCr)
    Applied crystallography online 31 (1998), S. 820-822 
    Details
    ISSN: 1600-5767
    Source: Crystallography Journals Online : IUCR Backfile Archive 1948-2001
    Topics: Geosciences , Physics
    Notes: Superscrew dislocations are visible in back-reflection synchrotron white-beam X-ray topographs of basal-cut SiC wafers in striking contrast as black rings surrounding white circles, even though such topographs suffer from extensive harmonic contamination. The contributions to the synchrotron white-beam topograph of each member of its series of harmonic reflections, {\bf g}=(0006n), where n=3 to 16, were calculated. Through intensity considerations and comparison with a {\bf g}=00018 topograph taken with Cu Kα1 radiation, the {\bf g}=00024 harmonic was determined to be the most important contributor. The contrast of features lying deep beneath the crystal's surface was attributed to higher harmonics with larger penetration depths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1107/S0021889898004683
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  • 9
    Electronic Resource
    Electronic Resource
    The 1.7 Å crystal structure of the regulator of chromosome condensation (RCC1) reveals a seven-bladed propeller (1998)
    [s.l.] : Macmillan Magazines Ltd.
    Nature 392 (1998), S. 97-101 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The gene encoding the regulator of chromosome condensation (RCC1) was cloned by virtue of its ability to complement the temperature-sensitive phenotype of the hamster cell line tsBN2, which undergoes premature chromosome condensation or arrest in the G1 phase of the cell cycle at non-permissive ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/32204
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  • 10
    Electronic Resource
    Electronic Resource
    Low-Molecular-Weight Heparin (Reviparin) Reduces the Incidence of Femoropopliteal In-Stent Stenosis: Preliminary Results of an Ongoing Study (1998)
    Springer
    CardioVascular & interventional radiology 21 (1998), S. 375-379 
    Details
    ISSN: 1432-086X
    Keywords: Key words: Arteries, extremities—Grafts and prostheses—Transluminal angioplasty—Stenosis or obstruction—Heparin
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Notes: Abstract Purpose: To examine the efficacy of the low-molecular-weight heparin, reviparin, for prevention of femoropopliteal stent restenosis. Methods: Forty-two patients who had implantation of flexible tantalum stents for the treatment of stenosis (n= 24) or occlusion (n= 18) of the femoral (n= 27) or popliteal (n= 15) arteries were included in this study protocol. An intraarterial bolus of 5000 IU heparin was given before percutaneous transluminal angioplasty (PTA), and in the case of stent implantation due to unsuccessful PTA, an additional dose of reviparin (3500 anti-factor Xa IU) was given. Postprocedurally, 10,500 anti-factor Xa IU of reviparin were administered intravenously over 24 hr, followed by 3500 anti-factor Xa IU subcutaneously twice a day for 23 days. Oral aspirin (100 mg/day) was prescribed for the long term. Follow-up criteria (maximum follow-up 37 months) were clinical symptoms, Doppler ankle arm indices, color and duplex sonography, and angiography for suspicion of restenosis. Results: Early stent thromboses were not observed. Overall primary patency rate (PPR) was 88% ± 6.0% (1 year) and 74% ± 10.1% (2 years). Major hemorrhagic complications have not occurred. Conclusion: Reviparin administered in a high dose over a period of 24 days is a safe medication regimen and provides excellent patency rates after stent implantation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002709900283
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