摘要:

SYNOPSIS1. In the freshwater spongeEphydatia, the osmiophile dictyosomes of the choanocytes are intimately related to the contractile vacuoles and show a great deal of morphological variation. In many cases the contractile vacuole itself possesses an osmiophile cortex. The condition here bears a general resemblance to the osmiophile vacuole‐reservoir complex of some flagellates.2. In the marine spongeGrantia, the osmiophile dictyosomes still show morphological variations. The vacuoles or chromophobe areas of the dictyosomes increase in size under the effect of hypotonic solutions. However, in ordinary or control material, the vacuoles show quantitative variations, though to a much lesser extent.3. The inference to be drawn from the above‐mentioned facts is that the sponge choanocyte dictyosome might be engaged in osmo‐regulation.4. From electron microscope work on the contractile vacuole cortices of protozoans, the parabasals of flagellates and the dictyosomes ofGrantiachoanocytes, it is quite clear that these structures have one thing in common, i.e. the presence in all of them of double lamellæ or flattened closed vesicles, a character which they share with the metazoan Golgi app

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00451.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

SYNOPSISThe New Zealand Glow‐worm (Arachnocampa luminosa) is able suddenly to douse its light when alarmed. A suggestion is made as to how this could take plac

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00452.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

SYNOPSISThe great sensitivity of photomultipliers offers many advantages over photocell‐amplifier systems for the measurement or comparison of low levels of illumination. However, a highly stabilized power supply is generally considered to be essential. Tests have shown that for many purposes such supplies are not necessary. A simple and compact instrument based on a non‐stabilized power supply has been developed. An important feature is the incorporation of a device for ensuring that the same total voltage is applied to the photomultiplier every time a reading is taken. The instrument can thus be regarded as manually stabilized. It has found widespread applications as an exposure meter in phase‐contrast, interference, fluorescence and electron microscopy, and can be used as the basis for many types of instruments in which the measurement of very low light intensities is req

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00453.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00454.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

SYNOPSISThe Araldite embedding resin, described by Glauertet al., for preparing thin sections for electron microscopy has been tried on a wide range of materials and found to prevent completely the “explosion damage” so common with methacrylate polym

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00455.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

SYNOPSISThis paper describes a low‐power micro‐projector especially designed for routine examination of fish‐scales. A particular feature of this apparatus is the use for proportional measurement of a simple electrical potentiometer system which can be readily applied in similar circumstances irrespective of magnific

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00456.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

SYNOPSISVarious microscopical techniques have been used to study the morphology of ascites tumour cells. These methods have the advantage that they are applicable to fresh material, thus avoiding the artefacts usually caused by fixation and associated procedures. Certain observations concerning the distribution of nucleic acids and proteins within these cells are discussed.

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00457.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00458.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

摘要:

Book reviewed in this article:The Microscopic Diagnosis of Tropical Diseases.—“Bayer”Annotated Bibliography of Works in Latin Alphabet Languages on Biological Microtechnique.—Freda Gray and Peter Gray.Practical Microscopical Metallography.—Richard Henry Greaves and Harold Wrighton.Analytical Microscopy.—T. E. Wallis.Microphotography—Photography at Extreme Resolution.—G. W. W. Stevens.Microscope, Construction, Use and Care.—Y. K. Sane, B.Sc.Hides, Skins and Leather under the Microscope.—British Leather Manufacturers' R

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00459.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1956.tb00460.x

出版商:Blackwell Publishing Ltd    

年代:1956

数据来源: WILEY