• Piri Keşif Aracı

1.  sayfa ve
1
Responses of the infrared sensilla of Melanophila acuminata (Coleoptera: Buprestidae) to monochromatic infrared stimulation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
H. Schmitz , M. Mürtz , H. Bleckmann
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
The pit organs of the beetle Melanophilaacuminata were stimulated with monochromatic infrared radiation using a continuous wave CO overtone infrared laser. Best sensitivity was in the wavelength range 2.8–3.5 μm. In this range a stimulus intensity of 14.7 mW cm−2 was sufficient to generate single action potentials. At a wavelength of 5 μm receptor performance significantly decreased. An increase in stimulus intensity caused a decrease in response latency and an increase in the number of action potentials elicited. At a given wavelength (3.4 μm) the dynamic amplitude range of action potential responses covered 12 dB. At high stimulus intensities (94.2 mW cm−2) a stimulus duration of 4 ms was sufficient to generate one to two action potentials and a stimulus duration of 60 ms already caused response saturation (with up to nine action potentials). In a repetitive stimulus regime distinct receptor potentials were visible up to a frequency of 600 Hz.
DOI : 10.1007/s003590000109
Anahtar Kelimeler : Key wordsMelanophila, Infrared receptor, Mechanoreceptor, Insect cuticle, Remote sensing
ISSN: 1432-1351
Cilt: 186
Sayı: 6
Sayfa: 543-549
Sınıflandırma :
2
Structure and optics of the eyes of the box jellyfish Chiropsella bronzie
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Megan Ou2019Connor , Anders Garm , Dan-E. Nilsson
Konu :
Animal Physiology, Neurosciences, Zoology
Yıl :
2009
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Cubomedusae have a total of 24 eyes of four morphologically different types. Two of these eye types are camera-type eyes (upper and lower lens-eye), while the other two eye types are simpler pigment pit eyes (pit and slit eye). Here, we give a description of the visual system of the box jellyfish species Chiropsella bronzie and the optics of the lens eyes in this species. One aim of this study is to distinguish between general cubozoan features and species-specific features in the layout and optics of the eyes. We find that both types of lens eyes are more severely under-focused in C. bronzie than those in the previously investigated species Tripedalia cystophora. In the lower lens-eye of C. bronzie, blur circles subtend 20 and 52° for closed and open pupil, respectively, effectively removing all but the coarsest structures of the image. Histology reveals that the retina of the lower lens-eye, in addition to pigmented photoreceptors, also contains long pigment-cells, with both dark and white pigment, where the dark pigment migrates on light/dark adaptation. Unlike the upper lens-eye lens of T.cystophora, the same eye in C.bronzie did not display any significant optical power.
DOI : 10.1007/s00359-009-0431-x
Anahtar Kelimeler : Box jellyfish, Visual systems, Photoreceptors, Eyes, Visual optics
ISSN: 1432-1351
Cilt: 195
Sayı: 6
Sayfa: 557-569
Sınıflandırma :
3
Spezifität und Inaktivierung des Spurpheromons von Lasius fuliginosus Latr. und Orientierung der Arbeiterinnen im Duftfeld
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Walter Hangartner
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00303068
ISSN: 1432-1351
Cilt: 57
Sayı: 2
Sayfa: 103-136
Sınıflandırma :
4
Different oscillators control the circadian rhythm of eclosion and activity in Drosophila
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Wolfgang Engelmann , Jürgen Mack
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Phase shifting and abolishing the circadian oscillation which controls eclosion inDrosophila pseudoobscura does not shorten the life of the flies and does not impair eclosion out of the puparium. However, the activity rhythm of the flies is controlled by a circadian oscillator which differs in period length, sensitivity to light and other features from the one controlling eclosion. Therefore, perturbing the oscillation controlling eclosion does not necessarily imply a corresponding perturbation of the oscillation controlling activity.
DOI : 10.1007/BF01350113
Anahtar Kelimeler : Controlling Activity, Circadian Rhythm, Activity Rhythm, Period Length, Circadian Oscillation
ISSN: 1432-1351
Cilt: 127
Sayı: 3
Sayfa: 229-237
Sınıflandırma :
5
Different types of rectification at electrical synapses made by a single crayfish neurone investigated experimentally and by computer simulation
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
W. J. Heitler , K. Fraser , D. H. Edwards
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
The rectification properties of electrical synapses made by the segmental giant (SG) neurone of crayfish (Pacifastacus leniusculus) were investigated. The SG acts as an interneurone, transmitting information from the giant command fibres (GFs) to the abdominal fast flexor (FF) motoneurones. The GF-SG (input) synapses are inwardly-rectifying electrical synapses, while the SG-FF (output) synapses are outwardly rectifying electrical synapses. This implies that a single neurone can make gap junction hemichannels with different rectification properties. The coupling coefficient of these synapses is dependent upon transjunctional potential. There is a standing gradient in resting potential between the GFs, SG and FFs, with the GFs the most hyperpolarized, and the FFs the most depolarized. The gradient thus biases each synapse into the low-conductance state under resting conditions. There is functional double rectification between the bilateral pairs of SGs within a single segment, such that depolarizing membrane potential changes of either SG pass to the other SG with less attenuation than do hyperpolarizing potential changes. Computer simulation suggests that this may result from coupling through the intermediary FF neurones.
DOI : 10.1007/BF00194899
Anahtar Kelimeler : Crayfish, Electrical synapse, Rectification, Computer simulation
ISSN: 1432-1351
Cilt: 169
Sayı: 6
Sayfa: 707-718
Sınıflandırma :
6
Über das Zeitgedächtnis der Bienen
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Ingeborg Beling
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Somit kristallisieren sich in der Beurteilung der untersuchten biologischen Rhythmen zwei Anschauungen heraus.
DOI : 10.1007/BF00340159
ISSN: 1432-1351
Cilt: 9
Sayı: 2
Sayfa: 259-338
Sınıflandırma :
7
Nectar loads as fuel for collecting nectar and pollen in honeybees: adjustment by sugar concentration
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Ken-ichi Harano , Jun Nakamura
Konu :
Animal Physiology, Neurosciences, Zoology
Yıl :
2016
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
When honeybee foragers leave the nest, they receive nectar from nest mates for use as fuel for flight or as binding material to build pollen loads. We examined whether the concentration of nectar carried from the nest changes with the need for sugar. We found that pollen foragers had more-concentrated nectar (61.8 %) than nectar foragers (43.8 %). Further analysis revealed that the sugar concentration of the crop load increased significantly with waggle duration, an indicator of food-source distance, in both groups of foragers. Crop volume also increased with waggle duration. The results support our argument that foragers use concentrated nectar when the need for sugar is high and suggest that they precisely adjust the amount of sugar in the crop by altering both volume and nectar concentrations. We also investigated the impact of the area where foragers receive nectar on the crop load concentration at departure. Although nectar and pollen foragers tend to load nectar at different areas in the nest, area did not have a significant effect on crop load concentration. Departing foragers showed an average of 2.2 momentary (<1 s) begging trophallactic contacts before leaving the nest. They might be rejecting nectar with inappropriate concentrations during these contacts.
DOI : 10.1007/s00359-016-1088-x
Anahtar Kelimeler : Foraging, Fuel, Nectar, Pollen collection, Social insect
ISSN: 1432-1351
Cilt: 202
Sayı: 6
Sayfa: 435-443
8
Auslösung und Steuerung des Spinnverhaltens und der Diapause bei Philosamia cynthia Dru. (Saturniidae, Lep.)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Elisabeth Pammer
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00343730
ISSN: 1432-1351
Cilt: 53
Sayı: 2
Sayfa: 99-113
Sınıflandırma :
9
Presynaptic inhibition in the phallic neuromuscular system of the cockroach Periplaneta americana
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
I. Parnas , Y. Grossman
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00714167
Anahtar Kelimeler : Chloride, Muscle Cell, Time Constant, Nerve Terminal, Timing Experiment
ISSN: 1432-1351
Cilt: 82
Sayı: 1
Sayfa: 23-32
Sınıflandırma :
10
The nature of the action of electricity in producing response and injury in Amoeba proteus (Leidy) and the effect of electricity on the viscosity of protoplasm
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
S. O. Mast
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00339111
Anahtar Kelimeler : Alkalinity, Proteus, Cathodal Side, Localize Accumulation, Anodal Side
ISSN: 1432-1351
Cilt: 15
Sayı: 2
Sayfa: 309-328
Sınıflandırma :
11
Endogenous gonadal, LH and molt rhythms in tropical stonechats: effect of pair bond on period, amplitude, and pattern of circannual cycles
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
E. Gwinner , S. König , M. Zeman
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
To investigate the effects of reproduction and associated stimuli on the circannual cycles of African stonechats Saxicola torquata axillaris birds were held for 29 months in aviaries under a constant equatorial (12.25 h) photoperiod, either singly (10 females and 10 males) or in 10 male/female pairs. The birds of all 3 groups went through circannual cycles in gonadal size, plasma LH and molt, but groups differed with regard to actual reproductive performance. During the second cycle, only one of the singly-held females laid eggs and incubated. In constrast, in the paired females egg-laying and incubation occurred in all but one bird. About 50% of the clutches from paired females contained fertilized eggs confirming the expectation of behavioral differences between the paired and unpaired birds. However, despite differences in reproductive performance there were no differences in either circannual period or duration of reproductive phases. Moreover, there was no correlation between number of broods produced per season and circannual parameters of the paired females. Therefore, the temporal course and, particularly, the period during which reproduction is possible is rigidly determined by an endogenous program that is not influenced by reproductive performance. A rigid program of this kind may be advantageous in the tropics because it prevents prolongation of the breeding season in years with favourable conditions which in turn could jeopardize optimal timing of breeding in the following year and thus reduce lifetime reproductive success.
DOI : 10.1007/BF00243399
Anahtar Kelimeler : Circannual rhythms, Saxicola torquata, Tropical birds, Reproductive cycles
ISSN: 1432-1351
Cilt: 177
Sayı: 1
Sayfa: 73-79
Sınıflandırma :
Çevre %84
Ekoloji %99
12
Biophysics of the ensiferan ear
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Clive Seymour , Brian Lewis , Ole N. Larsen , Axel Michelsen
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00656873
Anahtar Kelimeler : Experimental Evidence, Local Variation, Sound Pressure, Sound Wave, Auditory Nerve
ISSN: 1432-1351
Cilt: 123
Sayı: 3
Sayfa: 205-216
Sınıflandırma :
13
Die Automatie und die zentrale Beeinflussung des Herzens von Periplaneta americana
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Gerolf Steiner
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00338129
ISSN: 1432-1351
Cilt: 16
Sayı: 1
Sayfa: 290-304
Sınıflandırma :
14
Changes in the respiratory properties of the blood in the carp, Cyprinus carpio , induced by diurnal variation in ambient oxygen tension
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Gunnar Lykkeboe , Roy E. Weber
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Effects of diurnal variation in ambient oxygen tension on acid-base balance and blood respiratory properties were investigated in carp (Cyprinus carpio). The carp were subjected to two cycles in ambient $$P_{O_2 }$$ between about 130 mm Hg and about 12 mm Hg at 17°C (cf. Figs. 1 and 2). The first period of hypoxia was characterized by a non-compensated respiratory alkalosis, i.e. whole blood showed an increase in pH from 7.92 to 8.14. During the second hypoxic period, 24 h later, a significantly smaller respiratory alkalosis was present, whole blood pH changed from 7.95 (the value found during the intermediate return to normoxia) to 8.08. The latter increase was associated with a significant increase of 25% in plasma bicarbonate concentration compared with the first period of hypoxia (Fig. 1, Table 1). The erythrocytic concentrations of hemoglobin and ATP were lowered by about 10%, compared with the normoxic values, during the two episodes of hypoxia, and this was due to a swelling of the erythrocytes during hypoxia. The red cell GTP concentration showed an altogether different change during the O2 cycling: the absolute concentration of red cell GTP changed to a steady level, 50% below that present at the onset of the experiment and the major part of this change took place between the two hypoxic periods (Fig. 2, Table 2). The results are discussed with reference to the respiratory function of the blood of carps during subjection to cyclic $$P_{O_2 }$$ changes in nature.
DOI : 10.1007/BF00689475
Anahtar Kelimeler : Bicarbonate, Diurnal Variation, Respiratory Function, Absolute Concentration, Cyclic Change
ISSN: 1432-1351
Cilt: 128
Sayı: 2
Sayfa: 117-125
Sınıflandırma :
Çevre %22
Kirlilik %43
Çevre %25
15
Die interspezifischen Wirkungen der Sexuallockstoffe der Saturniidae (Lepidoptera)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Ernst Priesner
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00428005
ISSN: 1432-1351
Cilt: 61
Sayı: 3
Sayfa: 263-297
Sınıflandırma :
16
Subject index to volumes 91–120 (1974–1977)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00620542
ISSN: 1432-1351
Cilt: 120
Sayı: 3
Sayfa: 279-340
17
Operant conditioning of antennal muscle activity in the honey bee ( Apis mellifera L.)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
J. Erber , B. Pribbenow , J. Kisch , D. Faensen
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Antennal movements of the honey bee can be conditioned operantly under laboratory conditions. Using this behavioural paradigm we have developed a preparation in which the activity of a single antennal muscle has been operantly conditioned. This muscle, the fast flagellum flexor muscle, is innervated by an identified motoneuron whose action potentials correlate 1:1 with the muscle potentials. The activity of the fast flagellum flexor muscle was recorded extracellularly from the scapus of the antenna. The animal was rewarded with a drop of sucrose solution whenever the muscle activity exceeded a defined reward threshold. The reward threshold was one standard deviation above the mean spontaneous frequency prior to conditioning. After ten conditioning trials, the frequency of the muscle potentials had increased significantly compared to the spontaneous frequency. The conditioned changes of frequency were observed for 30 min after conditioning. No significant changes of the frequency were found in the yoke control group. The firing pattern of the muscle potentials did not change significantly after conditioning or feeding. Fixing the antennal joints reduces or abolishes associative operant conditioning. The conditioned changes of the frequency of muscle potentials in the freely moving antenna are directly comparable to the behavioural changes during operant conditioning.
DOI : 10.1007/s003590000111
Anahtar Kelimeler : Key words Honey bee, Operant learning, Antennal system, Neural correlate of learning
ISSN: 1432-1351
Cilt: 186
Sayı: 6
Sayfa: 557-565
Sınıflandırma :
18
A visually evoked escape response of the housefly
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Mats H. Holmqvist , Mandyam V. Srinivasan
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Flies (Musca domestica) avoid danger by initiating a rapid jump followed by flight. To identify the visual cues that trigger the escape response in the housefly, we measured the timing and probability of escapes when the fly was presented with a variety of visual stimuli created by moving targets toward it. Our results show that an escape response is triggered by an approaching dark disk, but not by a receding dark disk. On the other hand, a bright disk elicits escape only when it recedes. A disk with black and white rings is less effective at eliciting escape than is a dark solid disk of the same size. This indicates that the darkening contrast produced by an approaching stimulus is a more crucial parameter than expansion cues contained in the optical flow. Escape is also triggered by a horizontally moving dark edge, but not by a moving bright edge or by a grating. An examination of several visual parameters reveals that the darkening contrast, measured from the onset of stimulation to the start of escape is nearly constant for a variety of stimuli that trigger escape reliably. Thus darkening contrast, coupled with motion may be crucial in eliciting the visually evoked escape response. Other visual parameters such as time-to-contact or target angular velocity seem to be relatively unimportant to the timing of escapes.
DOI : 10.1007/BF00197657
Anahtar Kelimeler : Fly, Vision, Escape response, Motion, Giant fiber pathway
ISSN: 1432-1351
Cilt: 169
Sayı: 4
Sayfa: 451-459
Sınıflandırma :
19
Assessing the use of genomic DNA as a predictor of the maximum absorbance wavelength of avian SWS1 opsin visual pigments
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Anders Ödeen , Nathan S. Hart , Olle Håstad
Konu :
Animal Physiology, Neurosciences, Zoology
Yıl :
2008
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Recently, in vitro mutation studies have made it possible to predict the wavelengths of maximum absorbance (λmax) of avian UV/violet sensitive visual pigments (SWS1) from the identity of a few key amino acid residues in the opsin gene. Given that the absorbance spectrum of a cone’s visual pigment and of its pigmented oil droplet can be predicted from just the λmax, it may become possible to predict the entire spectral sensitivity of a bird using genetic samples from live birds or museum specimens. However, whilst this concept is attractive, it must be validated to assess the reliability of the predictions of λmax from opsin amino acid sequences. In this paper, we have obtained partial sequences covering three of the known spectral tuning sites in the SWS1 opsin and predicted λmax of all bird species for which the spectral absorbance has been measured using microspectrophotometry. Our results validate the use of molecular data from genomic DNA to predict the gross differences in λmax between the violet- and ultraviolet-sensitive subtypes of SWS1 opsin. Additionally, we demonstrate that a bird, the bobolink Dolichonyx oryzivorus L., can have more than one SWS1 visual pigment in its retina.
DOI : 10.1007/s00359-008-0395-2
Anahtar Kelimeler : Colour vision, Microspectrophotometry, MSP, Ultraviolet sensitive, Violet sensitive
ISSN: 1432-1351
Cilt: 195
Sayı: 2
Sayfa: 167-173
Sınıflandırma :
20
Periodicity coding in the primary auditory cortex of the Mongolian gerbil (Merionesunguiculatus ): two different coding strategies for pitch and rhythm?
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
H. Schulze , G. Langner
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Periodic envelope or amplitude modulations (AM) with periodicities up to several thousand Hertz are characteristic for many natural sounds. Throughout the auditory pathway, signal periodicity is evident in neuronal discharges phase-locked to the envelope. In contrast to lower levels of the auditory pathway, cortical neurons do not phase-lock to periodicities above about 100 Hz. Therefore, we investigated alternative coding strategies for high envelope periodicities at the cortical level. Neuronal responses in the primary auditory cortex (AI) of gerbils to tones and AM were analysed. Two groups of stimuli were tested: (1) AM with a carrier frequency set to the units best frequency evoked phase-locked responses which were confined to low modulation frequencies (fms) up to about 100 Hz, and (2) AM with a spectrum completely outside the units frequency-response range evoked completely different responses that never showed phase-locking but a rate-tuning to high fms (50 to about 3000 Hz). In contrast to the phase-locked responses, the best fms determined from these latter responses appeared to be topographically distributed, reflecting a periodotopic organization in the AI. Implications of these results for the cortical representation of the perceptual qualities rhythm, roughness and pitch are discussed.
DOI : 10.1007/s003590050147
Anahtar Kelimeler : Key words Amplitude modulation, Envelope periodicity, Periodotopy, Temporal analysis, Timbre
ISSN: 1432-1351
Cilt: 181
Sayı: 6
Sayfa: 651-663
Sınıflandırma :
21
Evidence of dominant parasympathetic nervous activity of great cormorants ( Phalacrocorax carbo )
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Maki Yamamoto , Akiko Kato , Yan Ropert-Coudert , Masayoshi Kuwahara , Shinichi Hayama , Yasuhiko Naito
Konu :
Animal Physiology, Neurosciences, Zoology
Yıl :
2009
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
The characteristics of autonomic nervous activity were examined on captive great cormorants Phalacrocorax carbo hanedae, using a power spectral analysis of heart rate variability. Heart rates were calculated from recordings of the electrocardiograms of the birds via embarked data loggers. We investigated the effects of blockades of the sympathetic or parasympathetic nervous systems using the indices of autonomic nervous activity such as high frequency (0.061–1.5 Hz) component, low frequency (0.02–0.060 Hz) component and the low frequency power component to high frequency power component ratio. Resting heart rate (85.5 ± 6.1 bpm) was lower than the intrinsic heart rate (259.2 ± 15.3 bpm). The heart rate drastically increased after the injection of the parasympathetic nervous blocker, on the other hand it slightly decreased after the injection of the sympathetic nervous blocker. The sympathetic, parasympathetic and net autonomic nervous tones calculated from heart rate with and without blockades were 40.9 ± 27.6, −44.5 ± 7.4 and −29.5 ± 9.0%, respectively. The effect of the parasympathetic nervous blockade on low frequency and high frequency power was greater than that of the sympathetic nervous blockade. Those data suggested that the parasympathetic nervous activity was dominant for great cormorants.
DOI : 10.1007/s00359-009-0414-y
Anahtar Kelimeler : Heart rate variability, Great cormorant, Power spectral analysis, Autonomic nervous activity, Electrocardiogram
ISSN: 1432-1351
Cilt: 195
Sayı: 4
Sayfa: 365-373
Sınıflandırma :
22
Versuche über die Wasserbewegung durch die Madreporenplatte von Echinus esculentus
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Friedrich Krüger
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00338157
ISSN: 1432-1351
Cilt: 18
Sayı: 1
Sayfa: 157-173
Sınıflandırma :
23
Dopaminergic modulation of visual responses in toads II. Influences of apomorphine on retinal ganglion cells and tectal cells
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
M. Glagow , J.-P. Ewert
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
  The behavioral studies of Part I have shown in common toads that after systemic administration of the dopamine agonist apomorphine the prey-directed orienting turning movements are suppressed while prey snapping is facilitated. Part II focusses on retinal and tectal single cell responses to moving objects. (1) After systemic administration of apomorphine, the discharge rates of retinal class R2 and R3 ganglion cell fibres – recorded from the retino-tectal projection – speeded up in response to visual objects traversing their excitatory receptive fields. This enhancing effect was independent of the recording site in the retino-tectal map. (2) The diameters of the excitatory receptive fields of R2 and R3 neurons doubled their sizes. Probably, apomorphine enhances the center-dominated excitatory responses at the expense of the strength of the inhibitory surround. (3) The apomorphine-induced effects were fully developed 20–35 min after drug administration. (4) At the same time the discharge rates of T5.1 and T5.2 tectal neurons were reduced under apomorphine. The effect was independent of the recording site in the retino-tectal map. The diameters of the excitatory receptive fields of these tectal neurons were not influenced. (5) To changes in configurational stimulus features, the basic pattern of discrimination was maintained. (6) It is suggested that tectal output to the turn-generating motor network – mediated by T5.1 and T5.2 neurons – is modulated by a pretecto-tectal pathway which involves dopaminergic pretectal cells. (7) The enhanced snapping can be interpreted in terms of a modulation of reticular/hypoglossal structures by dopaminergic preoptic/hypothalamic/solitary systems.
DOI : 10.1007/s003590050022
Anahtar Kelimeler : Key wordsu2002u200AApomorphineu2009, u2009Retinal ganglion cellsu2009, u2009 Tectal neuronsu2009, u2009Visionu2009, u2009Toad
ISSN: 1432-1351
Cilt: 180
Sayı: 1
Sayfa: 11-18
Sınıflandırma :
24
The processing of directional vibratory signals in the ventral nerve cord of Locusta migratoria
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Andrej Čokl , Christian Otto , Klaus Kalmring
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
The ability of ventral cord neurons to code the direction of a vibration source was tested. The vibration receptors in all six legs were stimulated simultaneously or successively (i.e. with a time delay between stimulation of several leg pairs) in order to simulate vibration signals coming from ahead or behind the animal. Three groups of vibration sensitive neurons were investigated by extracellular recordings:
DOI : 10.1007/BF00610665
Anahtar Kelimeler : Time Delay, Response Pattern, Vibration Signal, Nerve Cord, Ventral Nerve Cord
ISSN: 1432-1351
Cilt: 156
Sayı: 1
Sayfa: 45-52
Sınıflandırma :
25
Beobachtungen über den Sauerstoffgehalt der Umwelt einiger Entoparasiten
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Th. v. Brand , W. Weise
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Auf Grund der Untersuchung des Sauerstoffgehaltes der Galle, des Dünndarminhaltes und der Dünndarmgase einiger Tiere wird gefolgert, daß die in diesen Organsystemen lebenden Parasiten ganz vorwiegend auf einen anoxybiotischen Stoffwechsel angewiesen sind.
DOI : 10.1007/BF00340645
ISSN: 1432-1351
Cilt: 18
Sayı: 2
Sayfa: 339-346
Sınıflandırma :
Hukuk %100
Ticaret Hukuku %100
26
Die spektrale Empfindlichkeit einzelner Sehzellen des Rückenschwimmers Notonecta glauca L. ( Heteroptera )
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Peter Bruckmoser
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00339349
ISSN: 1432-1351
Cilt: 59
Sayı: 2
Sayfa: 187-204
Sınıflandırma :
27
Effects of long scotophase and cold acclimation on heat production in two diurnal rodents
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
A. Haim
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Heat production $$(\dot V_{O_2 } )$$ of two diurnal rodents,Rhabdomys pumilio andLemniscomys griselda was measured in long scotophase-LS (8L: 16D; 25°C) acclimated and long scotophase and cold — LSAC (8L: 16D; 6°C) acclimated animals and compared to a control group (12L: 12D; 25°C). LS increased $$\dot V_{O_2 } $$ in both species. Further acclimation of LSAC increased $$\dot V_{O_2 } $$ inR. pumilio and decreased $$\dot V_{O_2 } $$ inL. griselda. LS increased body temperature (T b) inL. griselda only. LS increased overall thermal conductance in both species. LSAC caused a further increase in this parameter inR. pumilio. A singificant (P<0.001) increase in the magnitude of maximal nonshivering thermogenesis (NST) was observed in both species due to LS acclimation. LSAC did not change this maximal NST but increased its obligatory part (minimal $$\dot V_{O_2 } $$ , P<0.05, inL. griselda, andP<0.001, inR. pumilio). The results of this study show that winter acclimatization of heat production mechanisms, in both species, may be due to extension of scotophase.
DOI : 10.1007/BF00688890
Anahtar Kelimeler : Thermal Conductance, Human Physiology, Body Temperature, Heat Production, Cold Acclimation
ISSN: 1432-1351
Cilt: 148
Sayı: 1
Sayfa: 77-81
28
Oxygen consumption and body temperature in neotropical and temperate zone lungless salamanders (Amphibia: Plethodontidae)
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Martin E. Feder
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00689308
Anahtar Kelimeler : Oxygen, Body Size, Oxygen Consumption, Human Physiology, Body Temperature
ISSN: 1432-1351
Cilt: 110
Sayı: 2
Sayfa: 197-208
Sınıflandırma :
29
Sinnesphysiologische Untersuchungen über die Nahrungsaufnahme bei verschiedenen Knochenfischarten
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
W. Wunder
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
DOI : 10.1007/BF00333679
ISSN: 1432-1351
Cilt: 6
Sayı: 1
Sayfa: 67-98
Sınıflandırma :
30
Über Ruhestadien erwachsener Insekten
Dergi Makalesi

Dergi Makalesi
Kaynak :
Springer Link
Yayıncı :
Journal of Comparative Physiology A
Yazar(lar) :
Henry Carlsen
Konu :
Animal Physiology, Neurosciences, Zoology
Journal of Comparative Physiology A
Yayıncı Web Sitesi Tam Metin
Kaydet
Der Vitamin B1-Haushalt von Kartoffelkäfern wurde während der Winterruhe und zum Vergleich auch im Verlauf der Fraßzeit untersucht, wobei die Probleme der Temperaturadaptation und des Hungers besondere Berücksichtigung fanden. Die Käfer gehen mit erheblichen Vitaminvorräten in Form von freiem Aneurin und Cocarboxylase in das Ruhestadium hinein. Das Sparprinzip steht während dieser Zeit im Vordergrund. Gedrosselte Atmung, eine Temperaturadaptation entsprechend dem Typ 3 und die vorherrschende Fettverbrennung verhindern einen stärkeren Vitaminschwund. Die gesteigerte Atmung nach dem Erwachen hat trotz hoher Temperatur ebenfalls nur geringe Vitaminabnahme zur Folge. Diese Anpassung ermöglicht es dem Käfer, die Zeit bis zur ersten Nahrungsaufnahme zu überbrücken. Im Gegensatz dazu haben die hungernden Sommerkäfer bei hohen Temperaturen äußerst starke Vitaminverluste, die offenbar die Gesamtatmung limitieren. Der relativ konstante und im großen Überschuß auftretende Cocarboxylasegehalt der winterruhenden Tiere läßt die fehlende Temperaturadaptation dieses Fermentanteils verständlich erscheinen. Es sind aus den Versuchen jedoch keine Rückschlüsse auf eine etwaige regulierende Tätigkeit des Apoferments möglich. Durch Thiaminase aus Muschelgewebe kann man den Cofermentanteil der Carboxylase weitgehend abbauen, ohne den stark gedrosselten Sauerstoffverbrauch der Wintertiere zu beeinflussen.
DOI : 10.1007/BF00299458
ISSN: 1432-1351
Cilt: 35
Sayı: 4
Sayfa: 344-352
Sınıflandırma :
Hukuk %100
Ticaret Hukuku %100

Yayın Yılı

Sınırla

Doküman Türü
Tümü

Disiplin
Tümü

Disipline Göre İlgililik

Alt Disiplin
Tümü

Konu
Tümü

Dergi İsmi
Tümü

Veri Tabanı
Tümü

X
Filtreler