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- Chernick, C. L., et al.
(författare)
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Thermochemistry of metallic alkyls : Part 7. - The heat of formation of mercury diphenyl, and of mercury phenyl chloride
- 1956
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Ingår i: Transactions of the Faraday Society. - 0014-7672. ; 52, s. 1088-1093
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Tidskriftsartikel (refereegranskat)abstract
- The heat of reaction of mercury diphenyl with hydrogen chloride in benzene solvent has been measured at 25°C. The heat of reaction of mercury diphenyl with mercuric chloride in methanol solvent has also been measured. From these heats of reaction, the heat of formation of mercury diphenyl has been derived: ΔHf° (Hgφ2, cryst.) = 65.4 ± 2 kcal/mole. Previous data on the heats of reaction of mercury diphenyl with bromine and iodine, and with mercuric bromide and mercuric iodide have been amended, and used to derive, independently, ΔHf° (Hgφ2, cryst.) = 67.2 ± 2.2, and 66.1 ± 3.2 kcal/mole. These values all agree, within their respective limits of error, with the heat of formation obtained by Fairbrother and Skinner from the heat of combustion of mercury diphenyl. The "best" value, ΔHf° (Hgφ2, cryst.) = 66 ± 2.5 kcal/mole, is proposed. The heat of formation of crystalline mercury phenyl chloride is -0.55 ± 2.3 kcal/mole.
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| 4. |
- Elofsson, Rolf
(författare)
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The larvae of Pasiphaea multidentata (Esmark) and Pasiphaea tarda (Kröyer).
- 1961
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Ingår i: Sarsia. - : Informa UK Limited. - 0036-4827. ; 4, s. 43-53
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Tidskriftsartikel (refereegranskat)abstract
- Pasiphaeid larvae collected in the Korsfjord, western Norway, were found to split up into two groups. Mainly two characteristics separated the larvae viz. the size of the larvae and the number of telson spines. The group with small larvae (8 to 10 mm) and the larger number of telson spines is referred to Pasiphaea multidentata and that with large larvae (10 to 12 mm) and fewer telson spines to Pasiphaea tarda. Embryos ready to hatch from an ovigerous female of Pasiphaea multidentata were dissected and it is shown that they resemble the small larvae above.
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| 5. |
- Elofsson, Rolf
(författare)
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The nauplius eye and frontal organs in decapoda (Crustacea)
- 1963
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Ingår i: Sarsia. - : Informa UK Limited. - 0036-4827. ; 12, s. 1-68
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Tidskriftsartikel (refereegranskat)abstract
- The present investigation concerns the nauplius eye and frontal organs in decapod Crustaceans. Representatives from all groups of the Decapoda are included. Some of the more important results are abstracted.The nauplius eye in several families within the Eucyphidea is more complicated than generally believed. It consists of a nauplius eye s. s. with three cups and three sensory cells in each and the incorporated dorsal frontal organ, which functions as an eye. The sensory cells are everse.The dorsal frontal organ is thus intimately connected with the nauplius eye s. s. and must not be mixed up with the eye papilla and the sensory pore X organ.The dorsal frontal organ is subjected to a considerable degree of variation. As part of a nauplius eye s, 1. as mentioned above it is an eye. In many species all over the Decapoda the frontal organ is reduced. A line of transformation can be shown from eye appearance through intermediate stages to “globuli” cells situated in the ganglion layer of the brain.The ventral frontal organ is more common than formerly believed and its paired nature is stressed.The author acceds to Hanström's hypothesis (1926) concerning the phytogeny of the frontal organs.
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| 8. |
- Löfgren, Lars, et al.
(författare)
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Kinematic and tessellation models of self-repair
- 1962
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Ingår i: Biological prototypes and synthetic systems. ; 1, s. 342-369
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Konferensbidrag (refereegranskat)abstract
- One of the causes of the great survival capability of some biological systems is the fact that they are systems of individuals such that the system behavior does not critically depend on anyone individual. Such systems can be regarded as redundant systems with different kinds and levels of redundancy. For example, although each specimen of a biological society has a limited life span, the whole society can exist for a much longer time. This is primarly due to self-reproduction, one form of redundancy. On a lower level, the lifespan of a specimen can be larger than the lifespan of parts of the specimen. Again this is due to redundancy, but of another form if the specimen is required to have a definite internal structure. The concept of self-repair is studied in tenus of automata theory. Different classes of automata (systems), like well-localized and non-well-localized automata, are considered. The parts (components) of the automata are uniformly exposed to errors. It is shown that if an automaton of a certain class has a lifespan not exceeded by any other automaton of the class, then it must contain a "repairing" mechanism. Such automata can be said to be self-repairing with respect to the class. A definition of self-repair is suggested. It is found that a self-repairing system which is well-localized with respect to its inputs and outputs has a finite lifespan. This corresponds to the finite life span we observe in nature for any animal or for any well-localized machine. On the other hand, if we relax the condition that the automaton be well-localized, then infinite lifespans can be obtained. Such automata also have self-reproducing properties and we obtain here a connection between the concepts of self-repair and self-reproduction. These self-repairing automata are, in a way, similar to growing biological societies with loosely specified internal structures. Automata have been studied by von Neumann and others with different kinds of models, namely kinematic models and tessellation (this name was suggested by Moore) models. We shall see that these two models can be traced back to the particle and wave aspects of matter. We will develop the concept of self-repair from both aspects.
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| 10. |
- Sigurd, Bengt
(författare)
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Salskrake, salknipa och salsvärta
- 1962
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Ingår i: Meijerbergs arkiv för svensk ordforskning. - 0348-7741. ; 11, s. 91-96
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Tidskriftsartikel (refereegranskat)
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