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Puslapis 1 nuo 214 rezultatus
From sea to shining sea: what is it about where you live and your stroke risk?
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Stroke frequencies of emperor penguins diving under sea ice.
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During diving, intermittent swim stroke patterns, ranging from burst/coast locomotion to prolonged gliding, represent potential energy conservation mechanisms that could extend the duration of aerobic metabolism and, hence, increase the aerobic dive limit (ADL, dive duration associated with onset of
Sea star inspired crawling and bouncing.
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The oral surface of sea stars is lined with arrays of tube feet that enable them to achieve highly controlled locomotion on various terrains. The activity of the tube feet is orchestrated by a nervous system that is distributed throughout the body without a central brain. How such a distributed
Underwater flight by the planktonic sea butterfly.
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In a remarkable example of convergent evolution, we show that the zooplanktonic sea butterfly Limacina helicina 'flies' underwater in the same way that very small insects fly in the air. Both sea butterflies and flying insects stroke their wings in a characteristic figure-of-eight pattern to produce
Cattle deaths during sea transport from Australia.
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OBJECTIVE
To establish the death rate and the causes of death in cattle exported by sea from Australia.
METHODS
Cattle deaths on voyages from Australia to all destinations between 1995 and 2000 were analysed retrospectively. On four voyages to the Middle East between December 1998 and April 2001,
Cardiac function after exhaustive open-sea swimming.
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OBJECTIVE
The present study examined the acute effects of exhaustive 25-km open-sea swimming on left ventricular (LV) function and morphology.
METHODS
Twenty elite male swimmers (22.3+/-4.1 years) participated in this study. Two-dimensionally guided M-mode echocardiograms, and electrocardiographic,
Cardiovascular responses during free-diving in the sea.
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Cardiac output has never been assessed during free-diving diving in the sea. Knowledge of human diving response in this setting is therefore scarce. 3 immersions were performed by 7 divers: at depths of 10 m, 20 m and 30 m. Each test consisted of 3 apnea phases: descent, static and ascent. An
Flipper stroke rate and venous oxygen levels in free-ranging California sea lions.
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The depletion rate of the blood oxygen store, development of hypoxemia and dive capacity are dependent on the distribution and rate of blood oxygen delivery to tissues while diving. Although blood oxygen extraction by working muscle would increase the blood oxygen depletion rate in a swimming
Stroke effort and relative lung volume influence heart rate in diving sea lions.
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The dive response, bradycardia (decreased heart rate) and peripheral vasoconstriction, is the key mechanism allowing breath-hold divers to perform long-duration dives while actively swimming and hunting prey. This response is variable and modulated by factors such as dive duration, depth, exercise
Calcium-dependent bidirectional power stroke of the dynein arms in sea urchin sperm axonemes.
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Active sliding between doublet microtubules of sea urchin sperm axonemes that were demembranated with Triton X-100 in the presence or absence of calcium was induced with ATP and elastase at various concentrations of Ca2+ to examine the effects of Ca2+ on the direction of the power stroke of the
MTHFR C677T polymorphism and its relation to ischemic stroke in the Black Sea Turkish population.
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The MTHFR C677T mutation has been shown to be associated with venous thrombosis. The role of this mutation in ischemic stroke is unclear. We investigated whether the MTHFR mutation is a risk factor for patients with ischemic stroke in the Black Sea Turkish population or not. We analyzed 30 patients
Flipper-driven terrestrial locomotion of a sea turtle-inspired robot.
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To discover principles of flipper-based terrestrial locomotion we study the mechanics of a hatchling sea turtle-inspired robot, FlipperBot (FBot), during quasi-static movement on granular media. FBot implements a symmetric gait using two servo-motor-driven front limbs with flat-plate flippers and
The utility of accelerometers to predict stroke rate in captive fur seals and sea lions.
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The energy expenditure of free-living fur seals and sea lions is difficult to measure directly, but may be indirectly derived from flipper stroke rate. We filmed 10 captive otariids swimming with accelerometers either attached to a harness (Daily Diary: sampling frequency 32 Hz, N=4) or taped to the
(Almost) Lost at SEA: An Unusual Cause of Cortical Blindness.
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A middle-aged man with a history of type 2 diabetes mellitus, hypertension, hyperlipidemia, prior cerebral vascular accident, and remote history of generalized seizure disorder presented with worsening right-sided visual deficits and focal seizures. On examination the patient had dense homonymous
[Professor ZHANG Yu-Lian's experiences in treatment of post-stroke ataxia by regulating marrow sea acupuncture].
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The experiences and characteristics of professor ZHANG Yu-lian in regulating marrow sea acupuncture for treatment of post-stroke ataxia is introduced. Professor ZHANG established regulating marrow sea acupuncture based on the fundamentals of traditional Chinese medicine combined with brain
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