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  • 11
    Electronic Resource
    Electronic Resource
    Effect of Lunar Eclipse on the Ionosphere (1936)
    [s.l.] : Nature Publishing Group
    Nature 137 (1936), S. 583-583 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] FOR some time we have been studying the variation of height of the different layers of the ionosphere at different hours of the day and night by the well-known group-retardation method. The technique of Breit and Tuve1, with the later improvements suggested by Appleton and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/137583a0
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  • 12
    Electronic Resource
    Electronic Resource
    Effect of Longitudinal Magnetic Field on the Refractive Index and Conductivity of Ionized Air (1938)
    [s.l.] : Nature Publishing Group
    Nature 141 (1938), S. 511-512 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE experimental study of an ionized gas in presence of the magnetic field has recently acquired considerable importance in connexion with the ionosphere. Notable investigations have been made by several authors1,2,3,4,5 on the effect of the transverse magnetic field on the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/141511a0
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  • 13
    Electronic Resource
    Electronic Resource
    Changes in Chloroplast Pigments in Leaves during Senescence (1937)
    [s.l.] : Nature Publishing Group
    Nature 140 (1937), S. 728-728 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Loss of chlorophyll in senescent leaves is a general phenomenon, and various views have been put forward to explain how chlorophyll disappears as the leaf yellows. The possibilities recognized are: (1) the decomposition of chlorophyll into its basic components and the transference of the latter ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/140728a0
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  • 14
    Electronic Resource
    Electronic Resource
    Respiratory adaptations in the larvae of Monoptems cuchia (Ham.) (1989)
    Oxford, UK : Blackwell Publishing Ltd
    Journal of fish biology 34 (1989), S. 0 
    Details
    ISSN: 1095-8649
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1095-8649.1989.tb03343.x
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  • 15
    Electronic Resource
    Electronic Resource
    PLASMA PROPRANOLOL CONCENTRATION IN PATIENTS WITH ANGINA AND ACUTE MYOCARDIAL INFARCTION (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 3 (1976), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. Plasma levels of propranolol were measured fluorometrically in patients with angina pectoris and in patients admitted to the Coronary Care Unit with acute myocardial infarction.2. In thirty patients with stable angina pectoris, plasma propranolol levels varied almost linearly with doses between 10 and 120 mg during 6-hourly chronic oral administration. Plasma levels greater than 100 ng/ml produced 70–80% reduction in the tachycardia induced by strenous exercise on a treadmill.3. In nineteen patients with acute myocardial infarction given oral propranolol, 20 mg 6-hourly, peak as well as trough plasma levels of the drug increased progressively but remained below 100 ng/ml in all except two patients during the first 24 h after their admission to the Coronary Care Unit.4. The data suggest that the use of low and fixed doses of propranolol may not produce adequate plasma levels or significant β-adrenoceptor blockade in the early stages of acute myocardial infarction in man.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1976.tb00606.x
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  • 16
    Electronic Resource
    Electronic Resource
    EFFECTS OF AMIODARONE AND L8040, NOVEL ANTIANGINAL AND ANTIARRHYTHIC DRUGS, ON CARDIAC AND CORONARY HAEMODYNAMICS AND ON CARDIAC INTRACELLULAR POTENTIALS (1976)
    Oxford, UK : Blackwell Publishing Ltd
    Clinical and experimental pharmacology and physiology 3 (1976), S. 0 
    Details
    ISSN: 1440-1681
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Notes: 1. The effects on the coronary and systemic haemodynamics of intravenous and intracoronary injections of two benzfuran derivatives, amiodarone and its brominated analogue (L8040), were studied in open-chest anaesthetized dogs. The effects of L8040 on cardiac intracellular potentials after 6 weeks of 20 mg/kg intraperitoneal injections in rabbits were also investigated.2. Both compounds produced dose-related and quantitatively similar decreases in coronary vascular resistance following their intracoronary administration; threshold effects occurred with about 0.25 mg of each drug and maximal effects with 4 mg. Larger intracoronary doses produced measurable systemic effects.3. Intravenous injections of amiodarone and L8040 (2·5·10 mg/kg) produced dose-related decreases in heart rate and aortic pressure with a fall in total peripheral resistance. The left ventricular output was either unaffected or increased with a consistent augmentation in stroke volume.4. The bradycardia produced by both drugs was associated with prolongation of the P–R interval of the electrocardiogram with no significant effect on the QRS duration or the Q–T interval.5. Each drug produced a decrease in the total peripheral vascular resistance with no change in left ventricular end diastolic pressure except after 10 mg/kg doses which led to an increase in this parameter.6. Cardiac contractile force and peak LV dp/dt were reduced by both drugs in a dose-related manner.7. Chronic intraperitoneal administration of L8040 in rabbits caused a prolongation of the duration of the atrial and ventricular intracellular potential without an effect on the maximal rate of depolarization.8. The effects of amiodarone or L8040 on the coronary circulation and arterial pressure may be attributed to their vasodilator properties but their depressant actions on cardiac contractile force and peak LV dp/dt with an increase in left ventricular end diastolic pressure at high doses, also suggest intrinsic negative inotropic propensity for both compounds.9. It is concluded that the overall effects on coronary and systemic haemodynamics of amiodarone and its brominated analogue are likely to permit a favourable influence on the balance of oxygen supply and demand in myocardial ischaemia; in addition, their actions on sinoatrial and atrio-ventricular conduction as well as those on cardiac repolarization suggest potential antiarrhythmic properties which merit investigation.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1440-1681.1976.tb00620.x
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  • 17
    Electronic Resource
    Electronic Resource
    Limitation of Bacteria by Micro-Predators in Soil (1948)
    [s.l.] : Nature Publishing Group
    Nature 161 (1948), S. 140-141 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] EIGHTY-SEVEN strains of very varied bacteria, t_j comprising common and rare strains from soil, pigmented and non-pigmented 'miscellaneous' strains, and a number of plant pathogens, were tested on eight micro-predators belonging to four different groups commonly found in soil. The methods used and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/161140a0
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  • 18
    Electronic Resource
    Electronic Resource
    Factors Contributing to the Bacteriolytic Effect of Species of Myxococci upon Viable Eubacteria (1946)
    [s.l.] : Nature Publishing Group
    Nature 158 (1946), S. 745-745 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] ALTHOUGH the lytic effect of certain myxobacteria upon the true bacteria (eubacteria) has been known for some years1–4, the mechanism of the process is imperfectly understood, and no one seems hitherto to have studied the possible production of antibiotic substances by the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/158745a0
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  • 19
    Electronic Resource
    Electronic Resource
    Chlorophyll Formation and Development of Photo-synthetic Activity in Juvenile Leaves of Mango ( Mangifera indica ) (1939)
    [s.l.] : Nature Publishing Group
    Nature 143 (1939), S. 161-162 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] THE question how far the development of photo-synthetic activity is concomitant with chlorophyll formation has not been definitely answered; the investigation in higher plants being mainly along two lines: (1) relationship between rates of photosynthesis and chlorophyll formation in leaves in ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/143161c0
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  • 20
    Electronic Resource
    Electronic Resource
    Effect of Flow on the Dielectric Constant of Liquids (1941)
    [s.l.] : Nature Publishing Group
    Nature 147 (1941), S. 712-712 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] WE have observed that certain liquids, for example, xylene (a mixture of ortho-, para- and meta-), ethyl ether, ethyl alcohol and benzene show very small yet distinct decreases in the values of their dielectric constants when they are flowing through condenser plates of small separations. With ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/147712a0
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