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1

Digitale Medien

Visual observation of lightning propagation (1986)

BAKER, DENNIS G. ; BAKER-BLOCKER, ANITA

[s.l.] : Nature Publishing Group

Nature 322 (1986), S. 215-215

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ISSN: 1476-4687

Quelle: Nature Archives 1869 - 2009

Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik

Notizen: [Auszug] SIR-Reliable scientific observers'3 have reported discerning direction of movement and propagation in long-duration horizontal lightning flashes. With measured velocities between 5.6 x 103 and 1.1 x 104 m s'1 for horizontal flashes4, lightning approaches the upper threshold for detection of ...

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1038/322215a0

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2

Digitale Medien

Vocal and visual stimuli enabling copulation behavior in female buntings (1988)

Baker, M. C. ; Baker, A. E. M.

Springer

Behavioral ecology and sociobiology 23 (1988), S. 105-108

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ISSN: 1432-0762

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Summary The loud and elaborate songs of male songbirds are throught to serve in territorial defense and to stimulate reproductive behavior in the female. We report here that in contrast to several other species, song alone is inadequate to induce sexual (lordosis) behavior in female indigo and lazuli buntings (Passerina cyanea and P. amoena); they require a more elaborate stimulus configuration to develop the full expression of sexual receptivity as indicated by a stereotyped copulation solicitation display. A live male must be present near the female, singing must ensue, and in addition a second and unique vocal utterance must be heard by the female; this is a soft buzzy-sounding vocalization, audible for no more than a few meters, not recognized previously as a critical arousal signal of the male songbird repertoire. Females also utter similar soft sounds in an intimate vocal exchange with the male leading to solicitation of copulation.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00299893

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3

Digitale Medien

The occurrence and significance of amino acids in floral nectar (1986)

Baker, H. G. ; Baker, I.

Springer

Plant systematics and evolution 151 (1986), S. 175-186

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ISSN: 1615-6110

Schlagwort(e): Angiosperms. — Nectar ; amino acids ; pollinators ; sample size ; phylogenetic constraint ; evolutionary significance. — Flora of California

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Approximately 1 500 angiosperm species, in previous papers, have been sampled for the assessment of the amino acids (a. a.) in their nectar. We reaffirm that the findings provide statistically significant data linking differences in the concentration with pollinator type. Flowers that are pollinated by animals that have alternative sources of protein-building a. a.’s show lower a. a. concentration than those that are not. There is a tendency for woody plant nectar a. a.’s to be less concentrated than those of herbaceous plants, but there can be “phylogenetic constraints” which may reduce the correlations of a. a. concentration with pollinator type and with life form. The individual a. a.’s form complements which are qualitatively extremely constant within species. Proline is a normal constituent of many nectars and does not necessarily indicate contamination of the nectar by pollen. Criticism of our findings byGottsberger & al. (1984) is answered by reference to our previous publications and those of other workers, and to the presentation of data from California native species, not published previously. All previous postulates are borne out by these new data with the exception of positive correlations of a. a. concentration with “primitive” and “advanced” floral characteristics taken one at a time, which appear to be inconsistent and are affected strongly by the nature of the family in which they occur. Summary data are provided for families and genera which indicate that high or low a. a. concentration can typify certain families and genera of both relatively “primitive” and relatively “advanced” nature. Needs for future research on an ecosystem basis are quoted.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02430273

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4

Digitale Medien

Kenrick, J. ; Bernhardt, P. ; Marginson, R. ; [weitere]

Springer

Plant systematics and evolution 157 (1987), S. 49-62

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ISSN: 1615-6110

Schlagwort(e): Angiosperms ; Leguminosae ; Mimosoideae ; Acacia terminalis ; Bee- and bird-pollination ; extrafloral nectaries ; intraspecific variation

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract Intraspecific variation has been found for several pollination-related characteristics in two isolated populations of the self-incompatible treeAcacia terminalis: floral characteristics including colour and flowering time; style length; size and colour of extrafloral nectaries on the leaf petioles; chemical components of the extrafloral nectar; different taxa of bee pollinators; and frequency differences in bird pollinators. These differences possibly reflect the evolution of two different pollination syndromes within this species.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00939180

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5

Digitale Medien

A family of pneumatically-operated thin layer samplers for replicate sampling of heterogeneous water columns (1985)

Baker, Alan L. ; Kromer Baker, Kathleen ; Tyler, Peter A.

Springer

Hydrobiologia 122 (1985), S. 207-211

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ISSN: 1573-5117

Schlagwort(e): microstratification ; thin layer sampler ; heterogeneous water column ; chemocline ; stratification ; meromixis

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie

Notizen: Abstract A series of inexpensive, pneumatic thin layer water samplers is described. They can be operated from small boats, and permit sampling at 2.5 cm intervals with little or no disturbance of stratified systems such as oxyclines or redoxclines of meromictic lakes, or microstratification of flagellates in sheltered epilimnia. Some models permit replicate sampling at closely-spaced intervals in a two-dimensional array. Their performance abilities are illustrated with examples of microstratification.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00018280

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6

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A family of pneumatically-operated thin layer samplers for replicate sampling of heterogeneous water columns (1985)

Baker, Alan L. ; Kromer Baker, Kathleen ; Tyler, Peter A.

Springer

In: Hydrobiologia. 1985; 122(3): 207-211. Published 1985 Mar 01. doi: 10.1007/bf00018280.

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Publikationsdatum: 1985-03-01

Print ISSN: 0018-8158

Digitale ISSN: 1573-5117

Thema: Biologie

Publiziert von Springer

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7

Digitale Medien

The Genetics of Bovine Papillomavirus Type 1 (1988)

Lambert, P F ; Baker, C C ; Howley, P M

Palo Alto, Calif. : Annual Reviews

Annual Review of Genetics 22 (1988), S. 235-258

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ISSN: 0066-4197

Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Thema: Biologie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1146/annurev.ge.22.120188.001315

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8

Digitale Medien

Evolving Concepts of Biological Control of Plant Pathogens (1987)

Baker, K F

Palo Alto, Calif. : Annual Reviews

Annual Review of Phytopathology 25 (1987), S. 67-85

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ISSN: 0066-4286

Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Thema: Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft , Biologie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1146/annurev.py.25.090187.000435

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9

Digitale Medien

Chemotherapy of Animal Parasites (1968)

Douglas, J R ; Baker, N F

Palo Alto, Calif. : Annual Reviews

Annual Review of Pharmacology 8 (1968), S. 213-228

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ISSN: 0362-1642

Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Thema: Medizin , Chemie und Pharmazie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1146/annurev.pa.08.040168.001241

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10

Digitale Medien

Intrafloral Ecology (1968)

Baker, H G ; Hurd, P D

Palo Alto, Calif. : Annual Reviews

Annual Review of Entomology 13 (1968), S. 385-414

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ISSN: 0066-4170

Quelle: Annual Reviews Electronic Back Volume Collection 1932-2001ff

Thema: Biologie

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1146/annurev.en.13.010168.002125

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