geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Abnormalities of microsporogenesis in Valeriana nitida polyploids


, : Abnormalities of microsporogenesis in Valeriana nitida polyploids. Genetika 8(7): 37-46

In natural tetraploids with 2n = 28, 83% of the meioses observed were normal and pollen fertility was 91%; octoploids, with 2n = 56, produced from them artificially were irregular in some 76% of the cells examined, many multivalents being observed, though pollen fertility was about 82%.

US$29.90


Other references

Munoz Saba, Y.; Cadena, A.; Rangel Ch, J.O.lando, 1995: Communities of nectar-pollen foraging bats from the Bosque de Galeria forest of the Sierra de la Macrena, Colombia. Studies about the bat-community from a forest ("bosque de galeria") located at the Sierra La Macarena allowed to establish several tropic categories. On the basis of trophic-equivalent (E. T.) the nomad "fruit-eating" group was...

Struyf, E.; Temmerman, S.; Meire, P., 2007: Dynamics of biogenic Si in freshwater tidal marshes: Si regeneration and retention in marsh sediments (Scheldt estuary). The sequestration and recycling of biogenic silica (BSi) in freshwater tidal marshes was modelled through the combination of short-term year round sediment trap data with a long-term sedimentation model, MARSED. The modelling was implemented thro...

Shah, R.Ali., 1942: Types of Pulmonary Tuberculosis Found in Different Communities, with Some Observations Made in Northern India. Indian Medical Gazette 77(10): 620-623

Battaglia Brunet F.; Foucher S.; Morin D.; Ignatiadis I., 2002: Chromate (CrO (sub 4) (super 2-) ) reduction in groundwaters and industrial effluents by using reducing bacteria in fixed-bed bioreactors. A biological method for chromate (CrO (sub 4) (super 2-) or Cr(VI)) reduction, using sulfate-reducing bacteria (SRB), was tested in 2-litter then 20-litter fixed-bed reactors, with H (sub 2) as a low-cost and clean substrate. The systems were inoc...

D.M.y, M.; Lequeux, G.; Maertens, J.; D.M.eseneire, S.; Soetaert, W.; Vandamme, E., 2006: Comparison of DNA and RNA quantification methods suitable for parameter estimation in metabolic modeling of microorganisms. Recent developments in cellular and molecular biology require the accurate quantification of DNA and RNA in large numbers of samples at a sensitivity that enables determination on small quantities. In this study, five current methods for nucleic a...

D.F.nollat A.M.P.; Lucero M.M.; Scrocchi G.J., 1990: New data on 2 cricetid species akodon andinus dolichonyx philippi 1896 and phyllotis darwini rupestris geravis 1841 in the province of salta argentina. Acta Zoologica Lilloana 39(2): 111-112

Suchetana, B.; Rajagopalan, B.; Silverstein, J., 2017: Assessment of wastewater treatment facility compliance with decreasing ammonia discharge limits using a regression tree model. A regression tree-based diagnostic approach is developed to evaluate factors affecting US wastewater treatment plant compliance with ammonia discharge permit limits using Discharge Monthly Report (DMR) data from a sample of 106 municipal treatment...

Kallai, L.; Fischer, J., 1963: Examination of secondary ossification centers in the hand of 1-3-year-old children. Kiserletes Orvostudomany 15: 33-41

Bargou, R.C.; Wagener, C.; Bommert, K.; Mapara, M.Y.; Daniel, P.T.; Arnold, W.; Dietel, M.; Guski, H.; Feller, A.; Royer, H.D.; Dörken, B., 1996: Overexpression of the death-promoting gene bax-alpha which is downregulated in breast cancer restores sensitivity to different apoptotic stimuli and reduces tumor growth in SCID mice. We have studied the expression of members of the bcl-2 family in human breast cancer. The expression pattern of these genes in breast cancer tissue samples was compared with the expression pattern in normal breast epithelium. No marked difference...

Hamilton, S.; McGee, E.; Jarvis, M.C.; Duncan, H.J., 1980: Effects of Phytophthora infestans on wound healing of potato tuber discs and on their infection with Phoma exigua. Potato tuber discs were inoculated with blight (P. infestans) sporangia of a race virulent on the potato cultivars used. Surface suberization of the tuber discs was not much affected by blight infection, but the subsequent formation of a suberized...