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  • Articles  (111)
  • Data  (3)
  • 2020-2024  (21)
  • 2020-2021
  • 1995-1999  (77)
  • 1985-1989  (16)
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  • 1
    Electronic Resource
    Electronic Resource
    A PCR Screen Identifies a Novel, Unconventional Myosin Heavy Chain Gene (MYO1) in Tetrahymena thermophila (1998)
    Oxford, UK : Blackwell Publishing Ltd
    The @journal of eukaryotic microbiology 45 (1998), S. 0 
    Details
    ISSN: 1550-7408
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Degenerate primers for two regions of sequence homology in the myosin head domain were used in a polymerase chain reaction screen of Tetrahymena thermophila genomic DNA to amplify a 765 bp fragment that was cloned and sequenced. Based on the presence of conserved, myosin-specific sequences, the 765 bp PCR product was identified as a fragment of a myosin gene, the first to be discovered in ciliated protozoa and herein referred to as MYO1. An inverse polymerase chain reaction strategy was used to obtain additional sequence data that included the entire head domain of MYO1. Alignment of the predicted amino acid sequence of the MYO1 head domain with known myosin sequences identified the ATP-binding site, a phosphorylation site, and other myosin-specific consensus regions. In a northern blot analysis, a 765 bp MYO1-specific probe detected a 6.6 kb transcript under highly stringent hybridization conditions. Phylogenetic analysis revealed that the predicted protein encoded by MYO1 is not a member of any of the previously defined myosin classes and therefore represents a presumptive new myosin class.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1550-7408.1998.tb04533.x
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  • 2
    Electronic Resource
    Electronic Resource
    Identification of the intrinsic self-trapped hole center in KD2PO4 (1999)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 75 (1999), S. 1503-1505 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The intrinsic "self-trapped" hole center in KD2PO4 crystals has been identified using electron paramagnetic resonance and electron-nuclear double resonance. These defects, labeled [D2PO4]o centers, can be formed at 77 K by irradiating with either 60 kV x rays or the fourth harmonic (266 nm) of a pulsed Nd:YAG laser. The hole is equally shared by two adjacent oxygen ions, and hyperfine interactions with one phosphorus and two equivalent deuterons are observed. The sample used in this investigation was approximately 80% deuterated, thus both [D2PO4]o and [HDPO4]o centers were detected, with the former being dominant. These intrinsic self-trapped hole centers are of interest because of their potential role in the transient optical absorption produced in KD2PO4 crystals at room temperature by intense 266 nm laser pulses. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.124736
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  • 3
    Electronic Resource
    Electronic Resource
    Synthesis, structure, electrochemistry, and photophysics of methyl-substituted phenylpyridine ortho-metalated iridium(III) complexes (1988)
    s.l. : American Chemical Society
    Inorganic chemistry 27 (1988), S. 3464-3471 
    Details
    ISSN: 1520-510X
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ic00293a008
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  • 4
    Electronic Resource
    Electronic Resource
    Complexation to macromolecules with a large number of sites (1999)
    College Park, Md. : American Institute of Physics (AIP)
    The Journal of Chemical Physics 111 (1999), S. 2818-2828 
    Details
    ISSN: 1089-7690
    Source: AIP Digital Archive
    Topics: Physics , Chemistry and Pharmacology
    Notes: This paper presents an approach based on the saddle-point approximation to study the equilibrium interactions between small molecules and macromolecules with a large number of sites. For this case, the application of the Darwin–Fowler method results in very simple expressions for the stoichiometric equilibrium constants and their corresponding free energies in terms of integrals of the binding curve plus a correction term which depends on the first derivatives of the binding curve in the points corresponding to an integer value of the mean occupation number. These expressions are simplified when the number of sites tends to infinity, providing an interpretation of the binding curve in terms of the stoichiometric stability constants. The formalism presented is applied to some simple complexation models, obtaining good values for the free energies involved. When heterogeneous complexation is assumed, simple expressions are obtained to relate the macroscopic description of the binding, given by the stoichiomeric constants, with the microscopic description in terms of the intrinsic stability constants or the affinity spectrum. © 1999 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.479559
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  • 5
    Electronic Resource
    Electronic Resource
    Physicochemical properties of VPI-5 (1989)
    s.l. : American Chemical Society
    Journal of the American Chemical Society 111 (1989), S. 3919-3924 
    Details
    ISSN: 1520-5126
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1021/ja00193a024
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  • 6
    Electronic Resource
    Electronic Resource
    Collision avoidance and resolution multiple access with transmission queues (1999)
    Springer
    Wireless networks 5 (1999), S. 95-109 
    Details
    ISSN: 1572-8196
    Source: Springer Online Journal Archives 1860-2000
    Topics: Electrical Engineering, Measurement and Control Technology , Computer Science
    Notes: Abstract We introduce a stable multiple access protocol for broadcast channels shared by bursty stations, which we call CARMA-NTQ (for collision avoidance and resolution multiple access with non-persistence and transmission queues). Like previous efficient MAC protocols based on tree-splitting algorithms (e.g., DQRAP), CARMA-NTQ maintains a distributed queue for the transmission of data packets and a stack for the transmission of control packets used in collision resolution. However, CARMA-NTQ does not require the mini-slots commonly used in protocols based on collision resolution. CARMA-NTQ dynamically divides the channel into cycles of variable length; each cycle consists of a contention period and a queue-transmission period. The queue-transmission period is a variable-length train of packets, which are transmitted by stations that have been added to the distributed transmission queue by successfully completing a collision-resolution round in a previous contention period. During the contention period, stations with packets to send compete for the right to be added to the data-transmission queue using a deterministic first-success tree-splitting algorithm, so that a new station is added to the transmission queue. A lower bound is derived for the average throughput achieved with CARMA-NTQ as a function of the size of the transmission queue and the number of queue-addition requests that need to be resolved. This bound is based on the upper bound on the average number of collision resolution steps needed to resolve a given number of queue-add requests.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1019178423020
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  • 7
    Electronic Resource
    Electronic Resource
    Shape selective alkylation of polynuclear aromatics with mordenite-type catalysts: A high yield synthesis of 4,4′-Diisopropylbiphenyl (1989)
    Springer
    Catalysis letters 2 (1989), S. 243-247 
    Details
    ISSN: 1572-879X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology
    Notes: Abstract Unique dealuminated mordenite zeolites with a high proportion of mesopores behave as shape selective catalysts in the liquid phase alkylation of biphenyl with propylene. Dealumination reduces deactivation and the mesopores enhance diffusion. High yields of 4,4′-diisopropylbiphenyl (〉 70%) are observed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00766213
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  • 8
    Electronic Resource
    Electronic Resource
    Longitudinal Overgrowth of Bone After Osteotomy in Young Rats: Influence of Bone Stability (1997)
    Springer
    Calcified tissue international 60 (1997), S. 391 -393 
    Details
    ISSN: 1432-0827
    Keywords: Key words: Bone growth — Fractures — Osteotomy.
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine , Physics
    Notes: Abstract. One hundred and five 5-week-old male rats were used to study the influence of the stability of an osteotomy on longitudinal overgrowth of the bone. In 45 rats (Group 1) a transverse diaphyseal osteotomy of the right tibia was made; the left tibia was left untreated. In the second 45 rats (Group 2) the right tibia was osteotomized after applying an external fixator; the left tibia underwent a sham operation without osteotomy. Fifteen further rats (Group 3) were used as a nonoperated control group. After being measured at different periods up to 20 weeks, the osteotomized tibiae of the Group 1 (unstable) were 16–25% longer than those of their nontreated limbs (P 〈 0.001). The osteotomized tibiae of the Group 2 (stable) were 6–11% longer than those of the sham-operated opposite limbs (P 〈 0.001). The osteotomized and unstable tibiae were 9–17% longer than the osteotomized and stable tibiae (P 〈 0.001) throughout the whole study. Although several factors have been considered to be responsible for longitudinal bone overgrowth after fracture in young animals, this work suggests that bone's stability plays a decisive role in the final outcome.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/s002239900249
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  • 9
    Electronic Resource
    Electronic Resource
    The Influence of the Ratio [Cl-]/[OH-] on the Corrosion Rate of Reinforcing Steel in Neutral and Acid Solutions (1995)
    s.l. ; Stafa-Zurich, Switzerland
    Materials science forum Vol. 192-194 (Aug. 1995), p. 907-0 
    Details
    ISSN: 1662-9752
    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
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/01/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.192-194.907.pdf
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  • 10
    Electronic Resource
    Electronic Resource
    Limnogeology of Laguna Miscanti: evidence for mid to late Holocene moisture changes in the Atacama Altiplano (Northern Chile) (1996)
    Springer
    Journal of paleolimnology 16 (1996), S. 1-21 
    Details
    ISSN: 1573-0417
    Keywords: Atacama ; Holocene ; limnogeology ; South America ; paleoclimatology ; lake sediments
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Geosciences
    Notes: Abstract Sedimentological, mineralogical and geochemical analyses of sediment cores from 9 m-deep, saline Laguna Miscanti, Chile (23 ° 44′S, 67 °46′W, 4140 m a.s.l.) together with high-resolution seismic profiles provide a mid to late Holocene time series of regional environmental change in the Atacama Altiplano constrained by 210Pb and conventional 14C dating. The mid Holocene was the most arid interval since the last glacial maximum, as documented by subaerial exposure and formation of hardgrounds on a playa surface. Extremely low lake levels during the mid Holocene appear consistent with lower effective moisture recorded at other sites along the Altiplano and in the Amazon Basin. Termination of this arid period represented a major shift in the regional environmental dynamics and inaugurated modern atmospheric conditions. The cores show a progressive upward increase in effective moisture interrupted by numerous century-scale drier periods of various intensities and durations that characterize a fluctuating late Holocene climate. In spite of chronological uncertainties, the major environmental changes seem to correlate with the available paleorecords from the region providing a coherent account of effective moisture variability in the tropical highlands of South America.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00173268
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