scholarly journals Extreme diving in mammals: first estimates of behavioural aerobic dive limits in Cuvier's beaked whales

2020 ◽  
Vol 223 (18) ◽  
pp. jeb222109 ◽  
Author(s):  
Nicola J. Quick ◽  
William R. Cioffi ◽  
Jeanne M. Shearer ◽  
Andreas Fahlman ◽  
Andrew J. Read
Keyword(s):  
Anaerobic Metabolism ◽  
Oxygen Storage ◽  
Deep Dive ◽  
Aerobic Dive Limit ◽  
Long Duration ◽  
Acid Buffering ◽  
Beaked Whales ◽  
The Relationship ◽  
Aerobic And Anaerobic ◽  
By Products

ABSTRACTWe analysed 3680 dives from 23 satellite-linked tags deployed on Cuvier's beaked whales to assess the relationship between long duration dives and inter-deep dive intervals and to estimate aerobic dive limit (ADL). The median duration of presumed foraging dives was 59 min and 5% of dives exceeded 77.7 min. We found no relationship between the longest 5% of dive durations and the following inter-deep dive interval nor any relationship with the ventilation period immediately prior to or following a long dive. We suggest that Cuvier's beaked whales have low metabolic rates, high oxygen storage capacities and a high acid-buffering capacity to deal with the by-products of both aerobic and anaerobic metabolism, which enables them to extend dive durations and exploit their bathypelagic foraging habitats.

scholarly journals Ultrastructural analysis of cytochrome oxidase in chick epiphyseal growth plate cartilage.

1988 ◽  
Vol 36 (9) ◽  
pp. 1161-1166 ◽  
Author(s):  
T Yamamoto ◽  
C V Gay
Keyword(s):  
Cytochrome Oxidase ◽  
Growth Plate ◽  
Oxidative Metabolism ◽  
Anaerobic Metabolism ◽  
Epiphyseal Growth Plate ◽  
Growth Plate Cartilage ◽  
Proliferative Zone ◽  
Relationship Of ◽  
The Relationship ◽  
Aerobic And Anaerobic

Histochemical detection of cytochrome oxidase activity in chicken growth plate revealed both positively and negatively stained mitochondria in chondrocytes of all zones, i.e., proliferative, pre-hypertrophic, hypertrophic, and calcifying zones. The proportion of positive to negative cells was lowest in the proliferative zone. As cytodifferentiation progressed, more positively stained cells were present. In positive cells all mitochondria were usually stained, and in negative cells all mitochondria were unstained. A few cells appeared to be in transition and contained both types of mitochondria. The results indicate that chondrocytes utilizing both aerobic and anaerobic metabolism are present in growth plate cartilage and that oxidative metabolism is favored in the more mature cells. The relationship of oxidative metabolism to calcification is discussed.

Platelet Metabolism during the Interiorization of Two Different Types of Particulate Matter

1972 ◽  
Vol 27 (02) ◽  
pp. 263-271 ◽  
Author(s):  
I. A. Cooper ◽  
P Cochrane ◽  
B. G. Firkin ◽  
K. J. Pinkard
Keyword(s):  
Particulate Matter ◽  
Polymorphonuclear Leukocyte ◽  
Anaerobic Metabolism ◽  
Human Platelets ◽  
Metabolic Changes ◽  
Polystyrene Latex ◽  
Considerable Time ◽  
Difference Of Opinion ◽  
Different Types ◽  
Aerobic And Anaerobic

SummaryIt has been suggested that human platelets possess the ability to phagocytose particulate matter similar to the polymorphonuclear leukocyte. However some difference of opinion has arisen regarding this contention, particularly as differences have been demonstrated with regard to the observed metabolic changes occurring in platelets related to such a process.The experiments reported in this paper were designed to observe the aerobic and anaerobic metabolism in human platelets during and following interiorization of two different particles, viz. polystyrene latex and thorotrast. The results of these experiments show a marked difference between both types of particles with regard to observable metabolic changes despite the rapid interiorization of both types of material. Some alteration occurs in both aerobic and anaerobic metabolism a considerable time after interiorization of latex, whereas no alteration could be demonstrated after interiorization of thorotrast. It is suggested that the interiorization of particulate matter is by some process other than phagocytosis and that observed metabolic changes related to latex may be due to a release reaction.

A model-driven quantitative metabolomics analysis of aerobic and anaerobic metabolism inE. coliK-12 MG1655 that is biochemically and thermodynamically consistent

2013 ◽  
Vol 111 (4) ◽  
pp. 803-815 ◽  
Author(s):  
Douglas McCloskey ◽  
Jon A. Gangoiti ◽  
Zachary A. King ◽  
Robert K. Naviaux ◽  
Bruce A. Barshop ◽  
...  
Keyword(s):  
Anaerobic Metabolism ◽  
Model Driven ◽  
Quantitative Metabolomics ◽  
Aerobic And Anaerobic ◽  
Metabolomics Analysis

Understanding Culture

2017 ◽  
Author(s):  
Babette Hellemans
Keyword(s):  
Gender Studies ◽  
Duration Analysis ◽  
International Perspective ◽  
Theoretical Background ◽  
The Arts ◽  
Long Duration ◽  
Historical Investigation ◽  
History Of ◽  
And Gender ◽  
The Relationship

This pioneering textbook explores the theoretical background of cultural variety, both in past and present. How is it possible to study 'culture' when the topic covers the arts, literature, movies, history, sociology, anthropology and gender studies? Understanding Culture examines the evolution of a concept with varying meanings depending on changing norms. Offering a long-duration analysis of the relationship between culture and nature, this book looks at the origins of studying culture from an international perspective. Using examples from the several scholarly traditions in the practice of studying culture, Understanding Culture is a key introduction to the area. It identifies the history of interpreting culture as a meeting point between the long-standing historical investigation of 'humanism' and 'postmodernism' and is a comprehensive resource for those who wish to further their engagement with culture as both a historical and contemporary phenomenon.

scholarly journals Aerobic and anaerobic metabolism for the zebrafish, Danio rerio, reared under normoxic and hypoxic conditions and exposed to acute hypoxia during development

2010 ◽  
Vol 70 (2) ◽  
pp. 425-434 ◽  
Author(s):  
WR Barrionuevo ◽  
MN Fernandes ◽  
O Rocha
Keyword(s):  
Danio Rerio ◽  
Anaerobic Metabolism ◽  
Developmental Stages ◽  
Acute Hypoxia ◽  
Lactate Concentration ◽  
Growth Delay ◽  
Hypoxic Conditions ◽  
Aerobic And Anaerobic ◽  
Mild Hypoxia

In order to verify the influence of chronic and acute ambient oxygen levels from egg to adult stage of the zebrafish, in vivo oxygen consumption (MO2), critical tensions of oxygen (Pcrit), heart rate (fH) and total body lactate concentration (Lc) were determined for Danio rerio (Hamilton, 1822) raised at 28 °C under normoxic (7.5 mgO2.L-1 or 80 mm.Hg-1) and hypoxic conditions (4.3 mgO2.L-1) and exposed to acute hypoxia during different developmental stages. Our findings confirmed that very early stages do not respond effectively to ambient acute hypoxia. However, after the stage corresponding to the age of 30 days, D. rerio was able to respond to acute hypoxia through effective physiological mechanisms involving aerobic and anaerobic metabolism. Such responses were more efficient for the fishes reared under hypoxia which showed that D. rerio survival capability increased during acclimation to mild hypoxia. Measurements of body mass and length showed that moderate hypoxia did not affect growth significantly until the fish reached the stage of 60 days. Moreover, a growth delay was verified for the hypoxic-reared animals. Also, the D. rerio eggs-to-larvae survival varied from 87.7 to 62.4% in animals reared under normoxia and mild hypoxia, respectively. However, the surviving animals raised under moderated hypoxia showed a better aptitude to regulate aerobic and anaerobic capacities when exposed to acute hypoxia.

Relationship of pyruvate and lactate during anaerobic metabolism. V: Coronary adequacy

1961 ◽  
Vol 200 (6) ◽  
pp. 1169-1176 ◽  
Author(s):  
William E. Huckabee
Keyword(s):  
Blood Flow ◽  
Coronary Flow ◽  
Cardiac Tissue ◽  
Anaerobic Metabolism ◽  
Constant Ratio ◽  
Blood Concentrations ◽  
Arterial Blood ◽  
Anesthetized Dogs ◽  
Relationship Of ◽  
The Relationship

Veno-arterial differences of pyruvate and lactate across the myocardium in chloralose-anesthetized dogs were very variable; in any one animal they changed continually with time despite constant blood flow and arterial blood concentrations. There was a systematic tendency of v-a lactate to vary with v-a pyruvate, as expressed in the calculated "Δ excess lactate," which remained nearly constant (or, if blood flow changed, bore a constant ratio to (a-v)O2). No change in Δ excess lactate from control values occurred in nonhypoxic experiments despite marked changes in v-a differences, arterial blood composition, and coronary flow. Cardiac Δ excess lactate became positive in most animals breathing 10% O2 in N2; output of excess lactate was also observed in all those in which moderate muscular exercise was induced. This anaerobic metabolism, or change in the relationship between pyruvate and lactate exchanges, was interpreted as an indication that O2 delivery response was not adequate to meet cardiac tissue requirements during such mild stresses when judged by the standards of adequacy of the basal state.

Do Anxious Swimmers Swim Slower? Reexamining the Elusive Anxiety-Performance Relationship

1988 ◽  
Vol 10 (1) ◽  
pp. 45-61 ◽  
Author(s):  
Damon Burton
Keyword(s):  
Low Complexity ◽  
Performance Measure ◽  
Somatic Anxiety ◽  
Self Confidence ◽  
Cognitive Anxiety ◽  
Long Duration ◽  
Two Samples ◽  
And Performance ◽  
Moderate Complexity ◽  
The Relationship

The purpose of this investigation was to utilize a multidimensional measure of anxiety and a more sensitive intraindividual performance measure to evaluate the relationship between anxiety and performance. Three hypotheses were tested. First, cognitive anxiety is more consistently and strongly related to performance than is somatic anxiety. Second, somatic anxiety demonstrates an inverted-U relationship with performance, whereas self-confidence and performance exhibit a positive linear relationship and cognitive anxiety and performance exhibit a negative one. Finally, short duration and high and low complexity events demonstrate stronger relationships between somatic anxiety and performance than do long duration or moderate complexity events. Two samples of swimmers completed the CSAI-2 prior to competition, and performance data were obtained from meet results. Correlational and multiple regression analyses generally supported Hypotheses 1 and 3, while polynomial trend analyses on standardized CSAI-2 scores confirmed trends predicted in Hypothesis 2. Overall, these results not only revealed that improved instrumentation allows demonstration of consistent anxiety-performance relationships, but they also provided additional construct validity for the CSAI-2.

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