SEASONAL CHANGES IN CO2 SENSITIVITY AND BLOOD CIRCULATION IN CERTAIN FRESH-WATER FISHES

1957 ◽  
Vol 35 (2) ◽  
pp. 195-200 ◽  
Author(s):  
J. S. Hart
Keyword(s):  
Blood Pressure ◽  
Fresh Water ◽  
Channel Catfish ◽  
Largemouth Bass ◽  
Seasonal Changes ◽  
Blood Circulation ◽  
Brown Bullhead ◽  
Co2 Sensitivity ◽  
Summer Temperatures ◽  
General Period

The asphyxiation level of oxygen at various levels of CO2 (CO2 sensitivity), measured on the brown bullhead, southern channel catfish, and largemouth bass decreased as the water warmed up with the approach of summer conditions in Florida. In the same general period blood pressure of the bass and channel catfish fell with seasonal change from winter to summer temperatures. Correlated changes were found in the weight of the ventricle with occluded blood. In the channel catfish, ventricle weights were lowest when water temperatures were warmest. They were greatest in winter in Florida and Tennessee fish when temperatures were lowest. Small seasonal trends in stroke output were also observed.

scholarly journals Seasonal Changes in Preprandial Glucose, A1C, and Blood Pressure in Diabetic Patients: Response to Liang

Diabetes Care ◽  
2007 ◽  
Vol 30 (11) ◽  
pp. e118-e118 ◽  
Author(s):  
M. C. Honeyman ◽  
S. Elkassaby ◽  
L. C. Harrison
Keyword(s):  
Blood Pressure ◽  
Seasonal Changes ◽  
Diabetic Patients

scholarly journals Seasonality of forest invertebrates in Hong Kong, South China

2002 ◽  
Vol 18 (4) ◽  
pp. 637-644 ◽  
Author(s):  
Kwok Hon Kai ◽  
Richard T. Corlett
Keyword(s):  
Hong Kong ◽  
Seasonal Changes ◽  
Bird Community ◽  
Absolute Minimum ◽  
Northern Margin ◽  
Plant Names ◽  
Bird Fauna ◽  
Summer Temperatures ◽  
Formed Part ◽  
The Tropics

Because of its position on the northern margin of the tropics (22° 17′N) and the southern coast of a huge continent, Hong Kong has a climate in which both temperature and rainfall are highly seasonal. Although summer temperatures are equatorial, the January mean is only 15.8 °C,and the absolute minimum recorded at sea level is 0 °C (Dudgeon & Corlett 1994). As a result, all aspects of the ecology of Hong Kong show seasonal changes. The most dramatic changes occur in the bird fauna, with the majority of species migratory (Carey et al. 2001). The winter fruiting peak in secondary shrublands and the forest understorey coincides with the arrival of partially frugivorous migrant robins and thrushes (Corlett 1993). However, while resident insectivore-frugivores consume almost entirely fruit during this period (Corlett 1998), all the winter visitors continue to eat insects and some (e.g. Phylloscopus warblers) are entirely insectivorous. The study of insect seasonality reported here formed part of a 30-mo study of the seasonality of a forest bird community in Hong Kong (Kwok & Corlett 1999, 2000). Plant names follow Corlett et al. (2000).

About contraindications to the use of digitalis

1930 ◽  
Vol 26 (10) ◽  
pp. 1052-1052
Author(s):  
D. Scherf
Keyword(s):  
Blood Pressure ◽  
High Blood Pressure ◽  
Heart Block ◽  
Blood Circulation ◽  
Complete Heart Block ◽  
Minute Volume ◽  
Absolute Contraindication ◽  
Conduction Disturbances ◽  
Digitalis Therapy ◽  
General Pathology

Abstracts. General pathology and therapy. About contraindications to the use of digitalis D. Scherf (Dioarztliche Praxis No. 1-1930) considers it unreasonable to be afraid of digitalis with sometimes concomitant cardiac weakness of bradycardia, since digitalis contributes to lengthening diastole, better filling the ventricles, increasing their contractions and increasing minute volume, and a trace, and improve blood circulation. In case of conduction disturbances, one should not always be afraid of using digitalis'a, since practice has shown that a complete heart block coming from digitalis'a sometimes improves the patient's condition. High blood pressure is not an absolute contraindication for digitalis therapy, as for reasons unknown to us, digitalis often lowers blood pressure.

scholarly journals Biophysics of Blood Circulation in Vascular Dementia and Alzheimer’s Disease

2019 ◽  
Vol 5 (4) ◽  
pp. 76-102 ◽  
Author(s):  
A. Volobuev ◽  
P. Romanchuk
Keyword(s):  
Alzheimer’S Disease ◽  
Blood Pressure ◽  
Alzheimer's Disease ◽  
Blood Flow ◽  
Vascular Dementia ◽  
Blood Circulation ◽  
Oxidant Stress ◽  
Cerebral Hypoperfusion ◽  
Adequate Treatment ◽  
Small Vessels

Modern rational pharmacotherapy allows being provided with a balance of efficacy and safety in clinical geriatrics, which is especially important in patients with neurovascular degeneration, including in the presence of severe forms of vascular comorbidity, requiring multi–component therapy, under the condition of active multidisciplinary and interdepartmental impact. Dementia in its origin is mixed and it is extremely difficult to divide into parts its primary degenerative or vascular component. The differentiated approach is determined by the heterogeneity of the pathological process, which common is the relationship of cerebral vascular damages with the development of the brain symptoms damage. The problem of nosological independence of Alzheimer’s disease is the subject of discussion for patients of older age groups (especially in people 65 years and older). The genesis of mnestic–intellectual disorders is due not so much to primary–degenerative as vascular changes, especially at the level of the microcirculatory canal. The modern problem of neurodegeneration has a neurophysiological, biophysical, gerontological, geriatric and strategic practical orientation since the diagnosis of the cause of the disease determines the choice of adequate treatment. Due to a large number of pathogenetical mechanisms, there is no single and standardized method of treatment for vascular dementia and Alzheimer’s disease. In any case, prevention of the development and progression of vascular dementia and Alzheimer’s disease should take into account the etiological mechanisms of its occurrence, because it will vary in patients with failures of small vessels, occlusive damages of the main arteries of the head or an embolism of cardiogenic origin. In patients with failures of small vessels, the main direction of therapy should be the normalization of blood pressure, which leads to improved cognitive functions. At the same time, excessive lowering of blood pressure can provoke an increase in mnestic-intellectual disorders, possibly caused by a secondary decrease in cerebral blood flow due to a violation of autoregulation. Biophysics of blood circulation in Alzheimer’s disease is characterized by disorders of laminar blood flow and cerebral hypoperfusion. As a result, failure intracellular metabolism, there is a cascade of changes in neurons associated with the processes of excitotoxicity and oxidant stress, which in turn stimulates amyloidogenesis. Experimental and 25-year observations have shown that the long–existing state of hypoperfusion leads to hippocampal disorders. This process is accompanied by memory impairment, structural changes in the capillaries in the hippocampus, impaired glucose and protein metabolism, β–amyloid deposition, activation of glial tissue, the death of hippocampal neurons.

Seasonal changes in blood pressure and some parameters of cardiac contractility in intact rabbits

1991 ◽  
Vol 112 (4) ◽  
pp. 1505-1507
Author(s):  
V. A. Frolov ◽  
�. S. Matyev ◽  
T. A. Kazanskaya ◽  
V. A. Mogilevskii ◽  
V. K. Lepakhin
Keyword(s):  
Blood Pressure ◽  
Seasonal Changes ◽  
Cardiac Contractility

Conservation, Ecology, and Management of Catfish: The Second International Symposium

2011 ◽  
Keyword(s):  
Ictalurus Punctatus ◽  
Channel Catfish ◽  
Large Scale ◽  
Growth Data ◽  
Blue Catfish ◽  
Brown Bullhead ◽  
Black Bullhead ◽  
Flathead Catfish ◽  
The North ◽  
Shared Environmental Factor

<em>Abstract</em>.—Growth rates are a core characteristic of catfish populations that are of increasing research interest. However, few studies have synthesized growth data across catfish populations and species to examine large-scale drivers of catfish growth. Here, a metaanalysis of growth was conducted for channel catfish <em>Ictalurus punctatus</em>, blue catfish <em>I. furcatus</em>, flathead catfish <em>Pylodictis olivaris</em>, brown bullhead <em>Ameiurus nebulosus</em>, and black bullhead <em>A. melas</em>, and relationships were documented between growth and climate variables, hydrologic habitats (lentic versus lotic), and latitudinal countergradients (a tendency for faster subannual growth in the north). Blue catfish, black bullhead, and brown bullhead growth correlated significantly and positively with temperature metrics. Blue catfish, flat-head catfish, and brown bullhead growth also correlated significantly and positively with sunshine fraction, wind speed, and evapotranspiration. Channel catfi sh growth did not correlate to any climate metrics. After removal of growth effects related to climate, blue catfish and brown bullhead had significantly faster growth in lotic than lentic habitats. Channel catfish and black bullhead had faster growth in lentic than lotic habitats. Flathead catfish showed no difference in growth between hydrologic habitat types. After standardizing growth by postsexual maturation age and the thermal opportunity for growth, significant and highly predictive countergradient growth relationships (mean <em>r </em><sup>2 </sup> = 0.47) were found for all five species across sites (i.e., faster temperature-standardized growth in more northerly populations). Slopes of these relationships did not differ among species, suggesting similar responses to latitude. There may be a genetic basis for countergradient growth in catfishes that developed over evolutionary scales via selection by a shared environmental factor. Catfish growth is variable within and among species but can be intensely shaped by all three primary factors evaluated in this study.

scholarly journals Pyrogallol-Phloroglucinol-6,6’-Bieckol from Ecklonia cava Improved Blood Circulation in Diet-Induced Obese and Diet-Induced Hypertension Mouse Models

Marine Drugs ◽  
2019 ◽  
Vol 17 (5) ◽  
pp. 272 ◽  
Author(s):  
Myeongjoo Son ◽  
Seyeon Oh ◽  
Hye Sun Lee ◽  
BoMi Ryu ◽  
Yunfei Jiang ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Dietary Supplements ◽  
Mouse Models ◽  
Blood Circulation ◽  
Ginkgo Biloba Extract ◽  
Ecklonia Cava ◽  
Vsmc Proliferation ◽  
Cell Dysfunction ◽  
Induced Hypertension ◽  
And Migration

Blood circulation disorders, such as hyperlipidemia and arteriosclerosis, are not easily cured by dietary supplements, but they can be mitigated. Although Ecklonia cava extract (ECE), as dietary supplements, are associated with improving the conditions, there are not many studies verifying the same. In this study, the beneficial effect of ECE and leaf of Ginkgo biloba extract (GBE), which is a well-known dietary supplement, were first confirmed in a diet induced-obese model. Afterwards, 4 phlorotannins were isolated from ECE, and their inhibitory effects on vascular cell dysfunction were validated. Pyrogallol-phloroglucinol-6,6-bieckol (PPB) was selected to be orally administered in two mice models: the diet induced obese model and diet induced hypertension model. After four weeks of administration, the blood pressure of all mice was measured, after which they were subsequently sacrificed. PPB was found to significantly improve blood circulation, including a reduction of adhesion molecule expression, endothelial cell (EC) death, excessive vascular smooth muscle cell (VSMC) proliferation and migration, blood pressure, and lipoprotein and cholesterol levels. Based on the excellent efficacy in diet-induced mouse models of obese and hypertension, our results demonstrate that PPB is a valuable active compound from among the phlorotannins that were isolated and it has the potential to be used in functional foods for improving the blood circulation.

scholarly journals Response to Seasonal Changes in Blood Pressure: Possible Interaction Between Sunlight and Brain Serotonin

Hypertension ◽  
2013 ◽  
Vol 62 (1) ◽  
Author(s):  
Pietro Amedeo Modesti ◽  
Stefano Rapi ◽  
Gian Franco Gensini ◽  
Marco Morabito ◽  
Simone Orlandini ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Seasonal Changes ◽  
Brain Serotonin
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