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  • Springer  (59)
  • American Association for the Advancement of Science  (11)
  • 2000-2004  (8)
  • 1980-1984  (44)
  • 1975-1979  (12)
  • 1965-1969  (6)
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Year
  • 11
    Electronic Resource
    Electronic Resource
    Solar rotation results at Mount Wilson (1983)
    Springer
    Solar physics 83 (1983), S. 321-338 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We publish here rotation results from Doppler velocity measurements made at Mount Wilson over a period of more than 14 years. Altogether data from 188 rotations are presented. These results are displayed in various tables and figures. Measurements of scattered light along with its effect on the measured rotation rate are shown.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148283
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  • 12
    Electronic Resource
    Electronic Resource
    Solar activity and recurrences in magnetic-field distribution (1969)
    Springer
    Solar physics 7 (1969), S. 28-38 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A study of the Mount Wilson magnetic-field synoptic chart material divided into latitude zones for the interval 1959–67, and a comparison of the data with sunspot groups have provided a better understanding of the structure of the background-field pattern and its relation to activity. The interaction of old and new fields within the pattern seems to result in long-lived sections of alternating polarity in both hemispheres. We postulate subsurface sources with rotation periods of about 27 days which produce active regions over a longitude zone of some tens of degrees. There is a tendency for the background-field features with strong fields to resist to some extent the shearing effects of differential rotation. A prediction is made concerning the nature of the interplanetary magnetic field above the ecliptic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148402
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  • 13
    Electronic Resource
    Electronic Resource
    Transequatorial loops interconnecting McMath regions 12472 and 12474 (1977)
    Springer
    Solar physics 52 (1977), S. 69-90 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract We discuss the life-story of a transequatorial loop system which interconnected the newly born active region McMath 12474 with the old region 12472. The loop system was probably born through reconnection accomplished 1.5 to 5 days after the birth of 12474 and the loops were observed in soft X-rays for at least 1.5 days. Transient ‘sharpenings’ of the interconnection and a striking brightening of the whole loop system for about 6 hr appear to be caused by magnetic field variations in the region 12474. A flare might have been related to the brightening, but only in an indirect way: the same emerging flux could have triggered the flare and at the same time strengthened the magnetic field at the foot-points of the loops. Electron temperature in the loop system, equal to 2.1 × 106 K in its quiet phase, increased to 3.1 × 106 K during the brightening. Electron density in the loop system was ≤ 1.3 × 109 cm−3 and it could be estimated to ∼7 × 108 cm−3 prior to the brightening. During the brightening the loops became twisted. There was no obvious effect whatsoever of the activity in 12474 upon the in erconnected old region. The final decay of the loop system reflected the decay of magnetic field in the region 12474.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00935791
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  • 14
    Electronic Resource
    Electronic Resource
    A white-light/Fe X/Hα coronal transient observation to 10 solar RadII (1983)
    Springer
    Solar physics 83 (1983), S. 153-166 
    Details
    ISSN: 1573-093X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Multi-telescope observations of the coronal transient of 15–16 April, 1980 provide simultaneous data from the Solar Maximum Mission Coronagraph/Polarimeter, the Solwind Coronagraph, and the new Emission Line Coronagraph of the Sacramento Peak Observatory. An eruptive prominence-associated white light transient is for the first time seen as an unusual wave or brightening in Fe x gl6374 (but not in Fe xiv gl5303). Several interpretations of this fleeting enhancement are offered. The prominence shows a slowly increasing acceleration which peaks at the time of the Fe event. The white light loop transient surrounding the prominence expands at a well-documented constant speed to 10R ⊙, with an extrapolated start time at zero height coincident with the surface activity. This loop transient exemplifies those seen above 1.7R ⊙ in that leading the disturbance is a bright (N e-enhanced) loop rather than dark. This is consistent with a report of the behavior of another eruptive event observed by Fisher and Poland (1981) which began as a density depletion in the lower corona, with a bright loop forming at greater altitudes. The top of the bright loop ultimately fades in the outer corona while slow radial growth continues in the legs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00148250
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  • 15
    Electronic Resource
    Electronic Resource
    Production of soldiers and maintenance of soldier proportions by laboratory experimental groups ofReticulitermes flavipes (Kollar) andReticulitermes virginicus (Banks) (Isoptera:Rhinotermitidae) (1981)
    Springer
    Insectes sociaux 28 (1981), S. 32-39 
    Details
    ISSN: 1420-9098
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Description / Table of Contents: Resume Les effets dûs à la taille du groupe, à l'époque de l'année et aux proportions initiales de soldats ont été explorés dans des groupes expérimentaux deReticulitermes flavipes (Kollar) et deReticulitermes virginicus (Banks). On a élevé des groupes en laboratoire pedant 12 semaines. Les petits groupes (de 500 à 1000 ouvriers) ont produit un plus faible pourcentage de soldats que les grands groupes (de 1500 à 2000 ouvriers). Le nombre de soldats produits dans un groupe est hautement corrélé au nombre total de termites qui survivent. Le pourcentage moyen observé dans tous les groupes a été de 1,75 pour les 2 espèces étudiées. La production de soldats chezReticulitermes flavipes a été la plus élevée dans les colonies prélevées en avril (2%) et la plus faible dans celles prélevées en octobre (0,38%). Les observations bimensuelles des augmentations et des baisses de production de soldats montrent qu'il y a un cycle saisonnier du potentiel de développement. La présence de soldats dans les groupes inhibe la production de nouveaux soldats. Un pourcentage anormalement élevé de soldats n'a pas provoqué l'élimination massive de soldats. De plus, la surcharge des groupes en soldats (plus de 1,75%) n'a pas affecté de façon nuisible la survie du groupe.
    Notes: Summary The effects of group size, time of year, and initial proportions of soldiers were explored in experimental groups ofReticulitermes flavipes (Kollar) andR. virginicus (Banks). Groups were held in the laboratory for 12 weeks. Small groups (500 to 1000 workers) produced a smaller percentage of soldiers than did larger groups (1500 to 2500 workers). The number of soldiers produced in a group is highly correlated with the total number of termites surviving. The average percentage produced for all group sizes was 1.75 for both species. Production of soldiers inR. flavipes was highest in colonies collected in April (2.0%) and lowest in those collected in October (0.38%). Bimonthly observations of increases and decreases in soldier production indicate a seasonal cycle in developmental potential. Presence of soldiers in groups inhibited the production of new soldiers. An abnormally high percentage of soldiers did not precipitate extensive elimination of soldiers. In addition, overloading groups with soldiers (more than 1.75%) did not adversely affect group survival.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF02223620
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  • 16
    Electronic Resource
    Electronic Resource
    Enhanced binding of phosphatidylserine-containing lipid vesicle targets to RAW264 macrophages (1984)
    Springer
    Molecular and cellular biochemistry 64 (1984), S. 81-87 
    Details
    ISSN: 1573-4919
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology , Medicine
    Notes: Summary Phosphatidylserine was found to significantly enchance the binding of phospholipid vesicles to RAW264 macrophages. We have measured the kinetics of non-specific uptake of unilamellar vesicles as a function of phosphatidylserine concentration in these model target membranes. Dimyristoylphosphatidylcholine was the principle component of these phospholipid vesicles. In most experiments, radiolabeled phospholipid and 1 mol % each of both a fluorescent phospholipid and a hapten-containing lipid headgroup were utilized. In the presence of specific anti-hapten antibody phosphatidylserine-containing vesicles are rapidly taken up via phagocytosis. The antibody-independent non-specific uptake of phosphatidylserine-free vesicles was low, as previously reported. However, the presence of 5 mol % phosphatidylserine dramatically enhanced the uptake of phospholipid vesicles by macrophages. This uptake was shown to be principally due to binding to the macrophage surface. Incubation of macrophages in the presence of sodium azide or at 4°C, conditions which are known to inhibit phagocytosis, do not influence the uptake of the lipid vesicles. Fluorescence video-intensification microscopy was used to observe the interaction of carboxyfluorescein-loaded vesicles with macrophages. Fluorescence could not be observed when using phosphatidylserine-free vesicles. However, phosphatidylserine-containing vesicles can be observed bound to the cell periphery. Intracellular fluorescence could not be observed. The binding of phosphatidylserine-containing vesicles was enhanced roughly four-fold over phosphatidylserine because the effect could not be observed with membranes containing 1 mol % or 2.5 mol% phosphatidylserine. In addition, the binding enhancement required the presence of divalent cations in the incubation medium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00420931
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  • 17
    Electronic Resource
    Electronic Resource
    Atmospheric effects in the remote sensing of phytoplankton pigments (1980)
    Springer
    Boundary layer meteorology 18 (1980), S. 299-313 
    Details
    ISSN: 1573-1472
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We investigate the accuracy with which relevant atmospheric parameters must be estimated to derive phytoplankton pigment concentrations (chlorophyll a plus phaeophytin a ) of a given accuracy from measurements of the ocean's apparent spectral radiance at satellite altitudes. The analysis is limited to an instrument having the characteristics of the Coastal Zone Color Scanner scheduled to orbit the Earth on NIMBUS-G. A phytoplankton pigment algorithm is developed which relates the pigment concentration (C) to the three ratios of upwelling radiance just beneath the sea surface which can be formed from the wavelengths (λ) 440, 520 and 550 nm. The pigment algorithm explains from 94 to 98% of the variance in log10 C over three orders of magnitude in pigment concentration. This is combined with solutions to the radiative transfer equation to simulate the ocean's apparent spectral radiance at satellite altitudes as a function of C and the optical properties of the aerosol, the optical depth of which is assumed to be proportioned to λ-n . A specific atmospheric correction algorithm, based on the assumption that the ocean is totally absorbing at 670 nm, is then applied to the simulated spectral radiance, from which the pigment concentration is derived. Comparison between the true and derived values of C show that: (1) n is considerably more important than the actual aerosol optical thickness; (2) for C 0299-1 0.2 Μg l-1 acceptable concentrations can be determined as long as n is not overestimated; (3) as C increases, the accuracy with which n must be estimated, for a given relative accuracy in C, also increases; and (4) for C greater than about 0.5 Μg 1-1, the radiance at 440 nm becomes essentially useless in determining C. The computations also suggest that if separate pigment algorithms are used for C ≲ 1Μgl-1 and C ≳ 1 Μgl-1, accuracies considerably better than ±± in log C can be obtained for C ≲ 1 Μg l-1 with only a coarse estimate of n, while for C ≳ 10 Μgl-1, this accuracy can be achieved only with very good estimates of n.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00122026
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  • 18
    Electronic Resource
    Electronic Resource
    Venom chemistry of ants in the genusMonomorium (1982)
    Springer
    Journal of chemical ecology 8 (1982), S. 285-300 
    Details
    ISSN: 1573-1561
    Keywords: Monomorium spp. ; Hymenoptera ; Formicidae 2,5-dialkylpyrrolidines ; ant venom alkaloids ; methoxymercuration-demercuration ; chemotaxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Chemistry and Pharmacology
    Notes: Abstract A comparative analysis of the venomous alkaloids produced by ant species in the subgenusMonomorium of the genusMonomorium has been undertaken. All species produce mixtures of unsymmetricaltrans-2,5-dialkylpyrrolidines, but the proportions of the constituents may vary considerably between species. All alkaloids contain both C6 and C9 side chains which are present as C9-saturated. C6-monounsaturated, and both C6-and C9-monounsaturated dialkylpyrrolidines. The structure of 2-(1-hex-5-enyl)-5-(1-non-8-enyl)pyrrolidine, a previously undescribed alkaloid, was proved by unambiguous synthesis after the location of the double bonds was established by the methoxymercuration-demercuration followed by mass spectrometry. The possible chemotaxonomic significance of the mixtures of venomous alkaloids produced by these species ofMonomorium is discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00984024
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  • 19
    Electronic Resource
    Electronic Resource
    Diel trophic interactions between vertically-migrating zooplankton and their fish predators in an eelgrass community (1978)
    Springer
    Marine biology 48 (1978), S. 207-213 
    Details
    ISSN: 1432-1793
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Diel changes in the composition of crustacean zooplankton and the diets of fish predators from an intertidal eelgrass flat were monitored concurrently. The zooplankton is characterized by two major components. The obligate zooplankters (holoplanktonic calanoid copepods and meroplanktonic decapod larvae) appear to exhibit vertical migration, being present in higher densities near the surface of the water column at night. The facultative zooplankton (amphipods and ostracods) are benthic during the day, but move up into the water column at night. Planktivorous midwaterdwelling fish consume calanoid copepods and decapod larvae during the day and cease feeding or switch their diet to amphipods at night. Benthic-dwelling fish consume some amphipods during both day and night. The factors important in prey selection by fish and the functional significance of vertical migration in both components of the zooplankton are discussed in the light of the changing patterns of fish predation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00397146
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  • 20
    Electronic Resource
    Electronic Resource
    Specific gravity and shrinkage of open grown Ponderosa pine (1968)
    Springer
    Wood science and technology 2 (1968), S. 292-298 
    Details
    ISSN: 1432-5225
    Source: Springer Online Journal Archives 1860-2000
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Zusammenfassung An Holz von Zweitwuchs-Ponderosa pine wurden die Rohdichte und die Schwindung bestimmt. Zu diesem Zweck wurden in Abständen von 4.8 m Stammscheiben entnommen. Das Holz dieser Bäume unterschied sich von jenen aus Altbeständen mit engen Jahrringen durch etwas niedrigere Rohdichtewerte sowie etwas niedrigere Radial-und Tangentialschwindung und durch etwas höhere Werte der Längsschwindung. Das Holz der aus dem Stammfuß entnommenen Scheiben erwies sich als dichter und zeigte häufig anormal hohe Schwindung und unregelmäßigen Faserverlauf. In den höher gelegenen Stammteilen beschränkte sich die übernormale Längsschwindung auf den Kernteil mit rund 25... 50 mm Durchmesser, d. h. auf den Bereich der ersten 2... 3 Jahrringe. Von diesen Ausnahmen ab-gesehen, zeigte das weitringige Holz eine ziemlich gleichmäßige Qualität. In diesem Zusammenhang wird empfohlen, den Fällungsschnitt etwas höher als gewölnlich anzusetzen, wenn es darauf ankommt, auch für den Erdstamm gleichmäßigere Holzqualität zu erzielen.
    Notes: Summary Wood specific gravity and shrinkage determinations were made on disks cut at 16-foot intervals from eight open-grown wide ringed second-growth ponderosa pines. This wood differed from forest grown narrower-ringed wood by having somewhat lower values for specific gravity and radial and tangential shrinkage and slightly higher values for axial shrinkage. Wood from the lowermost (stump) disks was denser and often had excessive axial shrinkage and irregular grain. At higher levels in the tree excessive axial shrinkage was limited to a 1... 2-inch core including the first 2... 3 growth rings. With these exceptions, the wideringed wood was uniform in quality. Slightly higher stumps were advocated if more uniform quality along the length of the butt log is desired.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00350275
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