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Volume 42,
Issue 3,
1966
Volume 42, Issue 3, 1966
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Observations on the Effects of a Chromosome Duplication in Aspergillus Nidulans
More LessSUMMARY: During a study of genetic factors affecting the morphology of Aspergillus nidulans a novel and characteristic variant was observed among the progeny of crosses involving certain morphologically normal parents. This type, which had a diminished linear growth rate, segregated in constant proportion; it was designated ‘crinkled’. It carried a duplication for a chromosome segment as a result of an unequal translocation in one parent. Crinkled colonies showed vegetative instability and sectored types which, in varying degree, approached normal morphology and growth rate. These revertants probably arose by loss of a variable part of the chromosome segment carried in duplicate. The loss occurred from either the translocated or untranslocated segment.
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Observations on the Effects of a Chromosome Duplication in Aspergillus Nidulans
More LessSUMMARY: During a study of genetic factors affecting the morphology of Aspergillus nidulans a novel and characteristic variant was observed among the progeny of crosses involving certain morphologically normal parents. This type, which had a diminished linear growth rate, segregated in constant proportion; it was designated ‘crinkled’. It carried a duplication for a chromosome segment as a result of an unequal translocation in one parent. Crinkled colonies showed vegetative instability and sectored types which, in varying degree, approached normal morphology and growth rate. These revertants probably arose by loss of a variable part of the chromosome segment carried in duplicate. The loss occurred from either the translocated or untranslocated segment.
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The Sterol Requirement of Phytophthora Cactorum
More LessSUMMARY: Several sterols and related substances were tested for ability to promote sexual reproduction in Phytophthora cactorum. These compounds were classified as active (oospores formed), partially active (oogonia and antheridia formed, but no oospores), or inactive (no oogonia). Quantitative differences between active substances were noted in respect of the numbers of oospores produced and the time of their appearance. The most active substances tested were 29-isofucosterol and β-sitosterol. Loss of activity was associated with shortening of the side chain of the sterol molecule or change in its configuration, absence of a double bond in the B ring or of a hydroxyl group at position 3 on the A ring.
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The Sterol Requirement of Phytophthora Cactorum
More LessSUMMARY: Several sterols and related substances were tested for ability to promote sexual reproduction in Phytophthora cactorum. These compounds were classified as active (oospores formed), partially active (oogonia and antheridia formed, but no oospores), or inactive (no oogonia). Quantitative differences between active substances were noted in respect of the numbers of oospores produced and the time of their appearance. The most active substances tested were 29-isofucosterol and β-sitosterol. Loss of activity was associated with shortening of the side chain of the sterol molecule or change in its configuration, absence of a double bond in the B ring or of a hydroxyl group at position 3 on the A ring.
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- Society For General Microbiology: Proceedings
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Society for General Microbiology: Proceedings
The Society for General Microbiology held its forty-fifth General Meeting at Imperial College, London, S.W. 7, on Thursday and Friday, 6 and 7 January 1966. On Thursday the Society joined with the British Mycological Society for a Symposium. Abstracts of the Contributions to the Symposium on ‘Chemical, serological and other techniques for the identification of fungi’, and of Original Papers are below.
The Virus Group met at the Wellcome Buildings, Euston Road, London, N.W. 1, on Tuesday and Wednesday, 4 and 5 January. On the morning of Tuesday there was a Symposium on ‘Tumour Viruses’ and Abstracts of the Contributions to this Symposium are given below.
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