摘要:

SynopsisA description is given of investigations on the structure of human spermatozoa. Both ordinary transmitted light, dark‐ground illumination and phase‐contrast have been used. Special methods have been applied for differential staining.The tail shows a ribbon‐like structure and contains an axial filament, finally emerging to form the tail‐end. The middle‐piece contains mitochondria and centrioles. The head contains a compact nucleus of the karyosome type, surrounded by a plasmatic envelope, and nucleoli. One or more vacuoles may be present. The plasmatic upper part of the head has the ability to make “groping” movements when it touches cells of foreign origin.The lower part of the head is surrounded by a cap, which stains heavily with some basic dyes. Chromosomal structures have been detected by means of the Feulgen technique.While the head, middle‐piece, and tail are very resistant to a number of chemicals, the connection between the head and the middle‐piece consists of a substance which may be decomposed easily b

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02335.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

SynopsisThe literature is reviewed. A technique for embedding tissues in polyethylene glycol 1,000 mono‐stearate (Nonex 63B) after preliminary infiltration with polyethylene glycol 900 is described. Preliminary dehydration in alcohol is not required and at no stage is the temperature of the tissue raised above 40° C. Measurement of tissue before and after embedding in Nonex, paraffin and celloidin shows that there is significantly less shrinkage in Nonex. It is shown that the celloidin in celloidin‐Nonex mixtures used experimentally for embedding penetrates tissue. The difficulty of mounting Nonex sections is discussed. Nonex sections stain well, phosphatase activity is well preserved and at least part of the lipid is preserved. It is concluded that the use of Nonex is specially indicated for tissues liable to shrinkage artefacts and may have some advantage for histo‐che

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02336.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

SynopsisThe device described enables a standard biological microscope to be adapted to the manufacture of micromanipulator tools. It has most of the features of the de Fonbrune microforge, but costs much less. The design is largely based on de Fonbrune's.

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02337.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

SynopsisAn account is given of the changes produced by a particular strain of Coxsackie virus in the skeletal muscles of young mice. These changes are: loss of striations (the “Z” and “H” bands disappearing before the “A” and “I”), swelling of the myofibrillæ, localized œdema, loss of all internal structure with generalized œdema, and finally regeneration i

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02338.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02339.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02340.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

摘要:

Stereo Photography in Practice. E. F. Linssen.Algues d'eau douce de la Guadeloupe et dependances. P. Bourrellyand E. Manguin.

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02341.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02342.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY

ISSN:0368-3974    

DOI:10.1111/j.1365-2818.1952.tb02334.x

出版商:Blackwell Publishing Ltd    

年代:1952

数据来源: WILEY