ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Cooling Bath for Cytological Investigations (1952)
    [s.l.] : Nature Publishing Group
    Nature 170 (1952), S. 719-719 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] With the increasing use of freezing and drying by histologists and cytologists, it is of interest to report that a non-inflammable and non-toxic cooling bath can be made by condensing dichloro-difluoromethane in a tube cooled by liquid air. This material is easily obtained as 'Arcton 6' (I.C.I.) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/170719b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    S-Methyl Dithizone and the Structure of Metal Dithizonates (1952)
    [s.l.] : Nature Publishing Group
    Nature 169 (1952), S. 756-756 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Treatment of a chloroform solution of 'keto' silver dithizonate with methyl iodide has now been found to give a monomethyl derivative of dithizone as an almost black solid with a bronze reflex, melting point 118-120. Now, since it is a monobasic acid3'4, dithizone dissolves in aqueous alkali, and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/169756a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Binary and Ternary Catalytic Mechanisms in the Hydration of Acetaldehyde (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 362-363 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] From the chemical point of view, the reversible hydration of acetaldehyde, CH3CHO + H2O CH3CH(OH)2, is very similar to the mutarotation of glucose, since both reactions involve the reversible addition of a hydroxyl group to a carbonyl group. It has recently been shown4'5 that this hydration ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167362b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Central Respiratory Spike Potentials (1951)
    [s.l.] : Nature Publishing Group
    Nature 167 (1951), S. 603-604 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Active loci in the posterior floor of the 4th ventricle are sparse and few under anaesthesia (pentothal or urethane) or after decerebration (in the rat), as also found by Gesell, Bricker and Magee1. Also in agreement with their observations, the respiratory discharges did not show the definite ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/167603b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Pyrolysis of Salts of Organic Acids (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 402-403 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A sample of barium acetate, in which the carboxyl carbon was labelled with carbon-13, namely, Ba(O2C13.CH3)2, was prepared by the reaction C1302 + CH3MgI -〉 CH3C13O2MgI, followed by treatment with mineral acid and subsequent conversion of the acetic acid to the barium salt. The labelled barium ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165402a0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Induced Grid Noise and Noise Factor (1950)
    [s.l.] : Nature Publishing Group
    Nature 165 (1950), S. 443-444 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Applying (1) to the problem of noise factor of the common cathode triode, and assuming that all induced grid noise is correlated with cathode-anode shot noise, it is found that the minimum noise factor obtained on adjusting conductive and susceptive components of the 'source' (grid-ground) ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/165443b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    A Simple Tissue Freeze-drying Apparatus using the Principle of Shortpath Sublimation (1953)
    [s.l.] : Nature Publishing Group
    Nature 171 (1953), S. 971-972 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The dryer works on the principle of short-path sublimation1 and is constructed of 'Pyrex' glass. The quenched tissue is placed in the bottom of the drying chamber (A), which is immersed in an ethyl oxalate/ solid carbon dioxide mixture giving a temperature of? 40 C. The top of the chamber is then ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/171971b0
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    The echo response inGnathonemus petersii (Mormyridae) (1974)
    Springer
    Journal of comparative physiology 92 (1974), S. 181-200 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary 1. Gnathonemus petersii respond to each other's electric organ discharge (EOD) with an “echo” discharge of their own at a latency of about 12 msec. This response persists until interfish distances reach about 30 cm (Fig. 4). 2. Artificial electrical stimuli were used to further characterize the response. Response threshold, latency dependence on stimulus intensity, polarity characteristics (Figs. 5–7), and differential regional sensitivity indicate that “medium” electroreceptors in the anterior region of the animal underlie the response. 3. Response probability depends upon the delay of the stimulus after the last EOD and also upon the instantaneous EOD rate (Figs. 8, 9). The echo response in turn resets the EOD rhythm of the responding animal (Fig. 10). These results suggest that the echo input pathway terminates on the presumed mesencephalic command center.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00694505
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    Social, stimulatory and motivational factors involved in intraspecific nest defense of a primitively eusocial halictine bee (1974)
    Springer
    Journal of comparative physiology 93 (1974), S. 173-181 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary The major releasing stimulus in intraspecific nest defense ofLasioglossum zephyrum is the odor emitted by a non-resident bee. Non-resident bees older than two days emit the releasing odor and elicit aggressiveness by guard bees, whereas younger non-resident bees are accepted more often. Defense motivation is a function of nest age and/or ontogeny. As nests become older and cells are constructed and provisioned, there is a gradual increase in guard aggressiveness, although no one attribute of nest ontogeny (such as cell construction) seems to be a definitive point at which nest defense is initiated, nor is there any specific day after the emergence of the first bee when nest defense begins. The guard plays the major role in rejecting intruders, although other members of the colony may do so if a non-resident bee passes the guard and enters the nest.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606997
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Patterns of intraspecific agonistic interactions involved in nest defense of a primitively eusocial halictine bee (1974)
    Springer
    Journal of comparative physiology 93 (1974), S. 183-193 
    Details
    ISSN: 1432-1351
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Summary Intraspecific nest defense inLasioglossum zephyrum involves specific agonistic action patterns by guard bees released by non-resident intruders. When guards are not highly motivated, intention movements are exhibited which also occur in the context of more aggressive interactions. Antennation, either mutual or by one bee, usually occurs prior to aggressive movements. Two main action patterns occur when a non-resident bee attempts to enter a nest: (1) the guard blocks the nest entrance with the abdomen, which often leads to backing movements and abdominal thrusts to eject the intruder, (2) the guard assumes a fight posture with head and abdomen extended toward the intruder; from the fighting posture, lunging often results in which the guard moves forward, alternating between head (mandibular) and abdomen (sting) thrusts. Most interactions are one-sided, with the intruder retreating from the guard, but mutual more intense fighting does occur.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00606998
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...