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  • 1
    Call number: PIK N 456-99-0366
    Type of Medium: Monograph available for loan
    Pages: XI, 133
    ISBN: 3860052209
    Series Statement: Diss.
    Branch Library: PIK Library
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  • 2
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    In:  [Invited talk] In: 2. International Symposium on Bio-Logging Science, 13.06.-16.06, St. Andrews, UK .
    Publication Date: 2012-02-23
    Type: Conference or Workshop Item , NonPeerReviewed
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  • 3
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    Springer
    In:  In: Offshore wind energy : research on environmental impacts. , ed. by Köller, J., Köppel, J. and Peters, W. Springer, Heidelberg, pp. 65-75.
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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  • 4
    Publication Date: 2018-06-07
    Description: A system is presented which uses a Hall sensor and an adjacent magnet, attached close to the cloaca of penguins, to record defecation, respiration and heart rates for both free-living birds and those in captivity. The output of the Hall sensor depends on a magnetic field, the strength of which is influenced in the presented scenario by the proximity of the magnet, which varies with movement of the cloaca. The elasticity of the cloaca results in minute, but perceptible, movements associated with the heart, respiration and defecation, although placement of the magnet and sensor is critical, and not all parameters can be measured all of the time. The system, incorporating a logger that can record at frequencies of 50 Hz, was tested on 17 captive and 4 freeliving Magellanic penguins, Spheniscus magellanicus, in Argentina. It showed increased defecation rate associated with feeding, the expected trends in bradycardia and tachycardia associated with diving, and appeared to record some movement of air sacs associated with breathing. The concept of measuring minute changes in relative exterior body positions as a cue to internal processes may be important in future studies for both free-living and captive animals, particularly since it is non-invasive and relatively easy to deploy.
    Type: Article , PeerReviewed
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  • 5
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    The Company of Biologists
    In:  Journal of Experimental Biology, 206 . pp. 1389-1395.
    Publication Date: 2017-07-10
    Description: Hagfish hemoglobin (Hb) is considered to represent a transition stage between invertebrate and vertebrate hemoglobins. The Hb system of Myxine glutinosa consists of three monomeric hemoglobins, which upon deoxygenation associate to form primarily heterodimers and heterotetramers. Myxine glutinosa is an osmoconformer, whose red blood cells show the exceptional ability to swell and remain swollen under hyposmotic conditions. In order to determine whether water activity regulates hemoglobin function, the effect of changes in osmolality on hemoglobin-O2 affinity was investigated by applying the osmotic stress method to purified hemoglobins as well as intact red blood cells. Oxygen affinity decreases when water activity increases, indicating that water molecules stabilize the low-affinity, oligomeric state of the hemoglobin. This effect is opposite to that observed in tetrameric vertebrate hemoglobins, but resembles that seen in the dimeric hemoglobin of the marine clam Scapharca inaequivalvis. Our data show that water may act as an allosteric effector for hemoglobin within intact red cells and even in animals that do not experience large variations in blood osmolality.
    Type: Article , PeerReviewed
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  • 6
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    Univ. of Alaska, Alaska Sea Grant College Program
    In:  In: Sea lions of the world. , ed. by Trites, A. W. and Atkinson, S. K. Univ. of Alaska, Alaska Sea Grant College Program, Fairbanks, Alaska, pp. 255-268. ISBN 1-566-12105-1
    Publication Date: 2012-02-23
    Type: Book chapter , PeerReviewed
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  • 7
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    Office National de la Chasse Paris
    In:  Game and Wildlife Science, 20 (4). pp. 1-19.
    Publication Date: 2017-10-05
    Description: We investigated the potential of a recently-developed data logger that monitors jaw movements using a magnet/Hall sensor combination to identify features that characterize prey ingestion. Experiments were conducted on eleven captive animal species of mammals, birds and turtles, with carnivorous and herbivorous feed- ing habits, exploiting either marine or terrestrial environments. Following calibra- tion, the timing of prey ingestion was accurately detected in all instances but food manipulation prior to swallowing led to a large interspecific variability in jaw opening angle over time. Pros and cons of the system are given together with an assessment of the applicability of such a tool for ecological studies on free-ran- ging animals. Overall, the system proved promising for estimation of the quanti- ty and quality of the food.
    Type: Article , NonPeerReviewed
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  • 8
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    Wiley
    In:  Wildlife Society Bulletin, 33 (1). pp. 337-342.
    Publication Date: 2016-05-26
    Description: Detailed studies of the behavior and location of free-ranging animals can be considerably enhanced with the use of animal-mounted devices. A few devices, such as data loggers, have to be recovered to access the data, whereas satellite tags or radiocollars often are left on the animal after the study period. Recovery of devices, which usually necessitates animal recapture, can be problematic, especially in larger species. This paper presents a new, non-electronic release mechanism, requiring no power source on the animal, that was successfully tested on South American sea lions (Otaria flavescens) in Argentina during the 2003–2004 austral summer. The system has potential for many larger terrestrial or aquatic animals.
    Type: Article , PeerReviewed
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  • 9
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Transformation of 6-Methyliden-tricyclo[3.2.1.02,7]oct-3-en-8-ones into Norcaradiene/Cycloheptatriene-Derivatives.Tricyclic ketones of type 1,5-dimethyl-6-methyliden-tricyclo[3.2.1.02,7]oct-3-en-8-one (1) [1] rearrange on heating with sodium methylate mainly to methyl-7-methyl-bicyclo[4.1.0]hepta-2,4-dien-7-carboxylates = methyl-7-methyl-norcaradien-7-carboxylates (4). Moreover, the formation of methyl 2-aryl-propionate (5) is observed. Thus, tricyclic 1 gives a mixture of norcaradiene derivatives 2 and 4 in 50% yield together with 13% of methyl 2-(2′, 3′-dimethylphenyl)-propionate (5) (Scheme 1). Similarly the tricyclic ketone 7 rearranges to norcaradienes 8 and 9 (31,5%) and methyl 2-(2′, 3′, 5′-trimethylphenyl)-propionate (10, 4%). In this case, the reduction products of 7, i.e. the alcohols 11 (24%) and 12 (8%) as well as other products derived from 11 are observed; heating of the endo-alcohol 11 with sodium methylate leads to the 2-arylpropan-1-ols 13 and 14 (Scheme 2). Under the same conditions the ketone 18 affords the norcaradiene ester 20 (Scheme 3). Scheme 4 shows the rearrangement of the pentacyclic ketone 21 to the cycloheptatriene derivative 22 and the base catalysed isomerisation of 22 to 23.The structure elucidations were achieved with the help of UV.-, IR.- and mainly NMR. spectra. The carboxy or methoxycarbonyl group assumes the exo-position in all the norcaradiene derivatives (NMR., also in the presence of NMR. shift reagents). The cycloheptatriene-noncaradiene-equilibrium is shifted to the norcaradiene side to 〉 95% in compounds 2, 4, 8 and 9 and to 〉 90% in 19 and 20. This is due to the 7-exo-carboxy or 7-exo-methoxycarbonyl group and the methyl groups in positions 2 and 3 (cf. Klärner [9], chapter 4). On the other hand, in the case of 22 the cycloheptatriene structure is almost exclusively predominant.The most probable mechanism for the rearrangement of tricyclic ketones of type 1 to methylnorcaradien-7-exo-carboxylates or to the corresponding carboxylic acids is depicted in Scheme 5. Thus, the reaction path leads from 1 through a, c, f, g and h to 4. The aromatization reaction of 1 to 5 and 3 proceeds preferentially through a, c (Scheme 5) and k (Scheme 6). The conversation of the tricyclic endo-alcohol 11 to 2-aryl-propan-1-ols 13 and 14 using sodium methylate occurs to ca. 90% via m → n and ca. 10% via m → p (Scheme 7); the primarily formed 2-aryl-propanals are reduced under the reaction conditions. The exo-isomer 12 shows no similar reaction.
    Additional Material: 4 Ill.
    Type of Medium: Electronic Resource
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  • 10
    ISSN: 0018-019X
    Keywords: Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Acid Catalysed Rearrangement of 1,5-Dimethyl-6-methyliden-tricyclo[3.2.1.02,7]oct-3-en-8endo-olsThe tricyclic alcohols 2,3,4 and 6 (Scheme 1) are synthesized by the reaction of the tricyclic ketone 1 with sodiumborohydrid or metalloorganic reagents. Their configuration at C(8) is determined by NMR. in the presence of Eu(fod)3. The exo-attack of 1 by the nucleophil forming the endo-alcohol is favored, the π-electrons of C(3) = C(4) hindering the endo-attack. On treatment with sulfuric acid in dioxane/water at 25° the tertiary alcohols yield aryl-substituted ketones. 3 gives in 78.5% yield a mixture of the 3-(dimethylphenyl)-2-butanones 12 and 13, in addition to 16.5% of (2,3,4-trimethylphenyl)-2-propanon (14) (Scheme 2). The alcohols 4 and 6 yield mixtures of the 2-(dimethylphenyl)-3-pentanones 19 and 20 (72%), and 2-(dimethylphenyl)-propiophenones 21 and 22 (68%), respectively (Scheme 2). In the case of the secondary alcohol 2 mainly products derived from hydration at the C(6), C(9) double bond are formed, namely the mixture of diols 23 and 24 (21%), and the mixture of the isomeric 2-(dimethylphenyl)propanals 25, 26 and 27 (3%) (Scheme 3). - The structures of 12-14, 19/20, 21/22, 23/24 and 25/26/27 were established by spectroscopic data. In the case of 12 and 13 the degradation of their mixture to the known 1-(dimethylphenyl)ethanols 17/18 confirmed the assignment. - The most probable mechanism for the rearrangement of 3 is shown in Schemes 4 and 5. The reaction proceeds from 3 through a, b and g to 12 and 13; 14 is formed via e, f and i. In the case of 4 and 6 only the reaction analogue to 3 → a → b → g ⇉12/13 takes place. The isomeric aldehyds 25-27 formed from 2 could have the structures s, t, and v. The former two could be generated in a similar way as 12/13 from 3, the latter one as shown in Scheme 8.
    Additional Material: 6 Tab.
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