Zobrazeno 1 - 10
of 154
pro vyhledávání: '"N. Grobbelaar"'
Autor:
D. J. B. Killick, D. de Winter, N. Grobbelaar, D. Edwards, M. J. Wells, S. A. Hulme, D. M. Joubert
Publikováno v:
Bothalia: African Biodiversity & Conservation, Vol 12, Iss 4, Pp 739-757 (1979)
Five papers cover different aspects of the contributions to and role of botany in the development of the Republic of South Africa. Two papers sum up the contributions for the non-agricultural and agricultural sectors. The introductory paper by D. J.
Externí odkaz:
https://doaj.org/article/1ae6b4b5a50f43f8acaa45ddd8b58e22
Akademický článek
Tento výsledek nelze pro nepřihlášené uživatele zobrazit.
K zobrazení výsledku je třeba se přihlásit.
K zobrazení výsledku je třeba se přihlásit.
Autor:
P.J. Robbertse, N. Grobbelaar
Publikováno v:
South African Journal of Botany. 80:77-80
The presence of small knobs/nodules found on the adaxial leaflet surface of some Encephalartos species was investigated in 134 cycad species of nine genera. The knobs, referred to as collicles, were found to be the result of connecting mucilage canal
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7f5eddf5d57e7e40a38cf4f8dc538c4d
Autor:
J. Van Staden, N. Grobbelaar
Publikováno v:
Environmental and Experimental Botany. 35:321-325
Sesbanimide and extracts made from ground powders of whole Sesbania punicea and S. bispinosa seeds and isolated embryos and testae of S. punicea inhibited the germination of vegetable, grass and weed seeds. This inhibition was more noticeable on seed
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::452f29aaddb1ddc2cf128d83aa477139
https://doi.org/10.1016/0098-8472(95)00005-0
https://doi.org/10.1016/0098-8472(95)00005-0
Autor:
N. Grobbelaar, T.-C. Huang
Publikováno v:
Journal of Plant Physiology. 140:391-394
Summary Evidence is presented that the periodic cessation of photosynthetic CO 2 assimilation rather than O 2 evolution appears to induce an endogenous nitrogenase activity rhythm in Synechococcus RF-1. Apart from the inductive effect of L/D cycles,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b5b6739419218a9c1a5c783a72543b79
https://doi.org/10.1016/s0176-1617(11)80813-8
https://doi.org/10.1016/s0176-1617(11)80813-8
Publikováno v:
Journal of Arid Environments. 22:117-136
The winter ephemerals of Namaqualand have evolved certain life history characteristics which enable them to survive in their semi-desert habitat. These ephemerals are highly plastic in their ability to regulate the length of their lifespan, their siz
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0475ca6be318f637ab83f8646b169bf3
https://doi.org/10.1016/s0140-1963(18)30586-x
https://doi.org/10.1016/s0140-1963(18)30586-x
Publikováno v:
Journal of Arid Environments. 22:51-66
Germination of seeds can occur over a long period annually, depending on the timing of the rainfall, and this determines the length of the period available for plants to complete their life cycles. The reaction of ephemerals to this unpredictability
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d4716260b8e09a7679a5a12f1017a6ad
https://doi.org/10.1016/s0140-1963(18)30656-6
https://doi.org/10.1016/s0140-1963(18)30656-6
Publikováno v:
FEMS Microbiology Letters. 83:99-102
There appears to be a close association between the nitrogenase activity peaks and dark respiration peaks of a Synechococcus RF-1 culture in which an endogenous nitrogenase activity rhythm has been induced. The rise in the respiration rate usually pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::decd034c31876d594c95704ab55e8971
https://doi.org/10.1111/j.1574-6968.1991.tb04396.x
https://doi.org/10.1111/j.1574-6968.1991.tb04396.x
Publikováno v:
Journal of Arid Environments. 20:15-29
Photoperiod had no effect on the time of flower initiation in any of the three examined ephemeral species. Although no obligate vernalisation requirements could be established, flower initiation was promoted by low temperatures. An increase in durati
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1154db2bd086069dc0e3a3fa52d8a645
https://doi.org/10.1016/s0140-1963(18)30772-9
https://doi.org/10.1016/s0140-1963(18)30772-9