The rare big-eye Pristigenys Niphonia (C&V) in South Africa
- Smith, J.L.B. (James Leonard Brierley), 1897-1968
- Authors: Smith, J.L.B. (James Leonard Brierley), 1897-1968
- Date: 1966
- Language: English
- Type: Text
- Identifier: vital:15044 , http://hdl.handle.net/10962/d1020226
- Full Text:
- Date Issued: 1966
- Authors: Smith, J.L.B. (James Leonard Brierley), 1897-1968
- Date: 1966
- Language: English
- Type: Text
- Identifier: vital:15044 , http://hdl.handle.net/10962/d1020226
- Full Text:
- Date Issued: 1966
The salinity tolerance of some Eastern Province fish in relation to their known distribution
- Authors: Hofmeyr, Hendrik Petrus
- Date: 1966
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21165 , http://hdl.handle.net/10962/6684
- Description: The tolerances to sea water, sodium chloride and sodium sulphate of various cichlid, cyprinid and anabantid species which occur naturally in or near the Eastern Province region of Southern Africa, were determined, and correlated with their distribution ranges. Of the nine freshwater species tested, only Tilapia mossambica is able to disperse through the sea and is therefore the only member of the secondary division (Myers 1937) present in this region. The remaining species are possibly all limited to the use of freshwater links for dispersal between river systems. Death of fish in sea water and in sodium chloride is chiefly due to loss of osmotic control, but in solutions of sodium sulphate a pronounced toxic effect is responsible for death. In all the solutions used, an inverse relation between survival time and concentration is present. No evidence of any cells specialised for salt excretion was found in the gills of fish exposed to various salt concentrations.
- Full Text:
- Date Issued: 1966
- Authors: Hofmeyr, Hendrik Petrus
- Date: 1966
- Language: English
- Type: Thesis , Masters , MSc
- Identifier: vital:21165 , http://hdl.handle.net/10962/6684
- Description: The tolerances to sea water, sodium chloride and sodium sulphate of various cichlid, cyprinid and anabantid species which occur naturally in or near the Eastern Province region of Southern Africa, were determined, and correlated with their distribution ranges. Of the nine freshwater species tested, only Tilapia mossambica is able to disperse through the sea and is therefore the only member of the secondary division (Myers 1937) present in this region. The remaining species are possibly all limited to the use of freshwater links for dispersal between river systems. Death of fish in sea water and in sodium chloride is chiefly due to loss of osmotic control, but in solutions of sodium sulphate a pronounced toxic effect is responsible for death. In all the solutions used, an inverse relation between survival time and concentration is present. No evidence of any cells specialised for salt excretion was found in the gills of fish exposed to various salt concentrations.
- Full Text:
- Date Issued: 1966
The thermal decomposition of mercuric oxalate and inorganic azides
- Authors: Moore, D J
- Date: 1966
- Subjects: Decomposition (Chemistry) , Oxalates -- Thermal properties , Mercuric Oxide -- Azides
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4483 , http://hdl.handle.net/10962/d1012878
- Description: The chemical reactivity of a solid is influenced to a marked degree by the presence of imperfections or defects in the solid. Bond strengths are considerably weaker at points of imperfection than elsewhere in the solid, and hence the initiation of reaction is favoured at these sites due to the relative ease of bond rupture. Line defects, such as edge or screw dislocations, jogs, Smekul cracks etc, are of prime importance in such changes. The surface of a solid or in intergranular boundaries, where a state of strain exists, are also favourable places for the initiation of a reaction, Point defects e.g. vacancies or interstitialions or atoms also play important roles in chemical change, often in conjuction with line defects.
- Full Text:
- Date Issued: 1966
- Authors: Moore, D J
- Date: 1966
- Subjects: Decomposition (Chemistry) , Oxalates -- Thermal properties , Mercuric Oxide -- Azides
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:4483 , http://hdl.handle.net/10962/d1012878
- Description: The chemical reactivity of a solid is influenced to a marked degree by the presence of imperfections or defects in the solid. Bond strengths are considerably weaker at points of imperfection than elsewhere in the solid, and hence the initiation of reaction is favoured at these sites due to the relative ease of bond rupture. Line defects, such as edge or screw dislocations, jogs, Smekul cracks etc, are of prime importance in such changes. The surface of a solid or in intergranular boundaries, where a state of strain exists, are also favourable places for the initiation of a reaction, Point defects e.g. vacancies or interstitialions or atoms also play important roles in chemical change, often in conjuction with line defects.
- Full Text:
- Date Issued: 1966
Title not specified
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378107 , vital:67188 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-15
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378107 , vital:67188 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-15
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
Title not specified
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378114 , vital:67189 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-16
- Description: Unaccompanied Xhosa church hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378114 , vital:67189 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-16
- Description: Unaccompanied Xhosa church hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
Ultraviolet specular reflectance, electronic absorption and the excitation of fluorescence in single crystals of anthracene
- Authors: Wright, W H
- Date: 1966
- Subjects: Anthracene crystals -- Fluorescence , Ultraviolet spectroscopy -- Absorption , Reflectance
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5544 , http://hdl.handle.net/10962/d1013366
- Description: From introduction: The Fluorescence Excitation Spectrum or anthracene is known to vary considerably with the age and condition or the crystal. This thesis represents an attempt to improve the understanding of these variations. To put the problem on a quantitative basis it was found necessary to know both the ultraviolet reflection and absorption spectra. Reports of the reflection spectrum appear to have been confined to the case of polarised incident light. In addition the reflectivity measurements are always reported for a freshly cleaved surface. For these reasons the reflectivity of anthracene for various conditions of the reflecting surface was measured with unpolarised light. These varying reflectivities were used to further knowledge of the chemical processes at the crystal surface, as well as being used directly in the calculation of fluorescence excitation spectra. Reflection spectra with a- and b- crystallographic axis polarisations were also obtained. Since such spectra are reported in the literature it was possible, by comparison, to conclude that the experimental methods used in this thesis yielded valid results. The polarised measurements were used to obtain optical constants for the crystal. In the interests of readability most of the complicated process of converting the reflectivities to optical constants is dealt with in three appendices to the thesis.
- Full Text:
- Date Issued: 1966
- Authors: Wright, W H
- Date: 1966
- Subjects: Anthracene crystals -- Fluorescence , Ultraviolet spectroscopy -- Absorption , Reflectance
- Language: English
- Type: Thesis , Doctoral , PhD
- Identifier: vital:5544 , http://hdl.handle.net/10962/d1013366
- Description: From introduction: The Fluorescence Excitation Spectrum or anthracene is known to vary considerably with the age and condition or the crystal. This thesis represents an attempt to improve the understanding of these variations. To put the problem on a quantitative basis it was found necessary to know both the ultraviolet reflection and absorption spectra. Reports of the reflection spectrum appear to have been confined to the case of polarised incident light. In addition the reflectivity measurements are always reported for a freshly cleaved surface. For these reasons the reflectivity of anthracene for various conditions of the reflecting surface was measured with unpolarised light. These varying reflectivities were used to further knowledge of the chemical processes at the crystal surface, as well as being used directly in the calculation of fluorescence excitation spectra. Reflection spectra with a- and b- crystallographic axis polarisations were also obtained. Since such spectra are reported in the literature it was possible, by comparison, to conclude that the experimental methods used in this thesis yielded valid results. The polarised measurements were used to obtain optical constants for the crystal. In the interests of readability most of the complicated process of converting the reflectivities to optical constants is dealt with in three appendices to the thesis.
- Full Text:
- Date Issued: 1966
Ungcwele, ungcwele, ungcwele
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377856 , vital:67162 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-04
- Description: Unaccompanied Xhosa church choral hymn.
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377856 , vital:67162 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-04
- Description: Unaccompanied Xhosa church choral hymn.
- Full Text: false
- Date Issued: 1966
Uxolo lweNkosi malibe nani ngamaxesha onke
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377923 , vital:67169 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-07
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377923 , vital:67169 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-07
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
UZuko kuThixo enyangweni
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377816 , vital:67158 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-02
- Description: Unaccompanied Xhosa church choral hymn.
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/377816 , vital:67158 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-02
- Description: Unaccompanied Xhosa church choral hymn.
- Full Text: false
- Date Issued: 1966
Yiza moya onyingcwele
- Zwelitsha church choir, Composer not specified, Dargie, Dave
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378000 , vital:67177 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-09
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966
- Authors: Zwelitsha church choir , Composer not specified , Dargie, Dave
- Date: 1966
- Subjects: Folk music , Sacred music , Field recordings , Africa, Sub-Saharan , Africa South Africa Zwelitsha sa
- Language: IsiXhosa
- Type: sound recordings , field recordings , sound recording-musical
- Identifier: http://hdl.handle.net/10962/378000 , vital:67177 , International Library of African Music, Rhodes University, Makhanda, South Africa , Dave Dargie Field Tapes, Rhodes University, Makhanda, South Africa , DDC074b-09
- Description: Unaccompanied Xhosa church choral hymn. Tyamzashe mass
- Full Text: false
- Date Issued: 1966