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  • 1
    Electronic Resource
    Electronic Resource
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 72 (1998), S. 3014-3016 
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report room temperature delamination of chemically vapor deposited diamond films on a Si substrate due to 1.5 MeV He+ ion bombardment. The delamination of films has been studied by scanning electron microscopy. The threshold fluence at which the delamination takes place has been determined in situ by monitoring the hydrogen signal with the help of elastic recoil detection analysis. Micro Raman measurements show the presence of residual stress (1.19 GPa) in the as-prepared films and its relaxation at the peripheri of the delaminated regions. It is proposed that enhancement of the residual stress during He+ ion bombardment leads to stress saturation conditions which result in the delamination of the brittle diamond films from the film/substrate interface. These findings lead to the possibility of creating ion-beam induced channels in diamond films for device isolation by suitable choice of film/substrate combination. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Amsterdam : Elsevier
    Comparative Biochemistry and Physiology -- Part A: Physiology 100 (1991), S. 607-612 
    ISSN: 0300-9629
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Biology , Chemistry and Pharmacology
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Allergy 52 (1997), S. 0 
    ISSN: 1398-9995
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Medicine
    Type of Medium: Electronic Resource
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  • 4
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Prolonged stay at high altitude significantly lowers the incidence of some of the diseases commonly encountered at sea level. This conclusion is based on a study involving 130,700 men stationed on plains between 760 m and sea level and 20,000 men stationed at altitudes between 3692 and 5538 m during the period 1965 to 1972. When yearwise differences in morbidity rates were determined for this period it was found that apart from amoebic hepatitis, goitre and lobar pneumonia, which show a higher incidence, the incidence of infections of bacterial, viral and protozoal origin, diabetes mellitus, hypertension and ischaemic heart disease, asthma and rheumatoid arthritis, gastric disorders, skin diseases, psychiatric ailments and anaemia was significantly lower at high altitude than at sea level. When the trend in morbidity rates was compared over the two subperiods of 1965 to 1968 and 1969 to 1972 it was found that generally increasing or decreasing trends on plains were reflected at high altitude. The overall incidence at high altitude however remained low. Part I of our communication deals with epidemiological data and these findings. Part II surveys the available literature and attempts to explain how improved hormonal state, enhanced fibrinolytic activity, accelerated humoral and cellular immune responses, favourable haemodynamics, better cardiac and cerebral functions, improved metabolic functions, and a relatively stable, dry and cold climate favourably influence the incidence of diseases at high altitude.
    Type of Medium: Electronic Resource
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  • 5
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract In 10 subjects susceptible to high altitude pulmonary oedema (HAPO) plasma cortisol and antidiuretic hormone (ADH) and urinary catecholamines were estimated both at sea level and daily during their stay at 3, 500 m (Leh). At high altitude 4 of the subjects developed HAPO, 2 got acute mountain sickness (AMS) and 4 remained unaffected. Plasma cortisol showed a sharp rise on the first day at high altitude in all the subjects. Thereafter, it declined gradually in the unaffected subjects. In the HAPO patients there was a sharp fall in the plasma cortisol level combined with antidiuresis. Changes in plasma ADH and urinary catecholamines were not consistent. It appears that failure in the normal adrenocortical response to altitude stress in susceptible subjects is a factor in precipitating HAPO.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Springer
    International journal of biometeorology 18 (1974), S. 279-287 
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Notes: Abstract Some of the blood and urinary constituents, oral glucose tolerance and urea clearance were determined in lowlanders at sea level (200 m) and at an altitude of 4, 000 m after their stay of two years. These data were compared with those of natives of high altitude area. The concentration of proteins, cholesterol, creatinephosphokinase and aspartate aminotransferase in blood among lowlanders after 2 year acclimatization were similar to that observed among highlanders. The urinary excretion of creatine and creatinine was of similar magnitude in highlanders and in acclimatized lowlanders but that of 17-keto and 17-hydroxysteroids was higher among highlanders. High altitude acclimatization among lowlanders facilitated appearance of a sharp peak in oral glucose tolerance curves and a decreased fasting blood glucose values. It also induced a restriction in renal filtration as indicated by a depressed urea clearance among lowlanders.
    Type of Medium: Electronic Resource
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  • 7
    Electronic Resource
    Electronic Resource
    Springer
    International journal of biometeorology 17 (1973), S. 95-101 
    ISSN: 1432-1254
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geography , Physics
    Description / Table of Contents: Zusammenfassung Die Wärmeabgabe der Hand von 16 gesunden Männern im Alter von 22–28 Jahren wurde im Tiefland (Delhi) und während 6 Wochen Aufenthalt in 3.300 m Höhe untersucht. In der Höhe wurden die Personen in 2 Gruppen aufgeteilt, von denen eine ohne und eine mit Kälteexponierung lebte. Nach 3 Wochen wurden die Bedingungen der Gruppen gewechselt. Nach 6 Wochen erfolgte eine Nachuntersuchung im Tiefland. In der Höhe bewirkte die zusätzliche Kältebelastung in der anfänglichen oder späteren Akklimatisationsphase eine signifikante Verminderung der Wärmeabgabe. Dagegen fehlten diese Veränderungen bei den Personen ohne Kältebelastung. Die lokale Kälteakklimatisation scheint in der Höhe gehemmt oder verlängert zu sein. Deshalb kann die Wärmeabgabe des Vorderarmes nicht als Indikator zur Beurteilung des Vorganges der Kälteakklimatisation in der Höhe geeignet zu sein.
    Abstract: Resume On a mesuré les pertes de chaleur de la main de 16 hommes en bonne santé dont l'âge était compris entre 22 et 28 ans. Ces mesures furent effectuées en plaine (Delhi) et durant un séjour de 6 semaines à 3300 m d'altitude. En altitude, on a formé 2 groupes dont l'un a été exposé au froid et l'autre pas. Après 3 semaines, les conditions de vie ont été interverties. Après 6 semaines de séjour en montagne, on a effectué un contrôle en plaine. En montagne, la contrainte supplémentaire de l'exposition au froid a eu pour conséquence une réduction de la perte de chaleur aussi bien durant la période précoce que subséquente d'acclimatation. Cette modification n'a au contraire pas été notées chez les personnes non soumises à la contrainte de froid. L'acclimatation au froid semble inhibitée ou au moins ralentie par l'altitude. Pour cette raison, les pertes de chaleur de la main et de l'avant-bras ne sauraient servir d'indicateur dans l'estimation des processus d'acclimatation au froid en altitude.
    Notes: Abstract Heat output from the hand of 16 healthy subjects, 22–28 years old, was recorded weekly at Delhi and after they were flown to an altitude of 3, 300 m, where they were divided into two equal groups. One group was exposed to hypoxia only and the other to hypoxia and cold. At the end of three weeks, the groups were interchanged and studied for a further period of three weeks. Thereafter, they were flown back to sea level and retested. There was a significant reduction (p 〈0.01) in heat output on superimposition of cold stress either in the initial or later phase of acclimatization to altitude, while no significant changes were observed in the absence of cold stress. It appears that local cold acclimatization is inhibited or prolonged at altitude and therefore heat output from the hand cannot be used as an indicator to judge the process of cold acclimatization at altitude.
    Type of Medium: Electronic Resource
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  • 8
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    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 45:3 (1973:Sept.) 423 
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  • 9
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    Unknown
    Baltimore : Periodicals Archive Online (PAO)
    Human Biology. 46:1 (1974:Feb.) 41 
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  • 10
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] g Tum-mo yoga is a form of meditation which allegedly allows its practitioners to alter body temperature. Previously, only subjective descriptions of this phenomenon existed: "The neophytes sit on the ground, cross-legged and naked. Sheets are dipped in icy water, each man wraps himself in one of ...
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