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  • 1
    Electronic Resource
    Electronic Resource
    EFFECTS OF PARAQUAT ON THE ULTRASTRUCTURE OF MESQUITE MESOPHYLL CELLS (1969)
    Oxford, UK : Blackwell Publishing Ltd
    Weed research 9 (1969), S. 0 
    Details
    ISSN: 1365-3180
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Summary. The effect of paraquat (l,1′-dimethyl-4,4′-bipyridylium-24) on the ultra-structure of mesophyll cells of honey mesquite (Prosopis juliftora (Swartz) DC. var. glandulosa (Torr.) Cockerell) was studied by means of electron microscopic techniques. The first visible change induced by the herbicide was a rapid disintegration of the plasmalemma, followed by rupturing of the chloroplast membranes and loss of chloroplast turgor. Changes that occurred in plants treated and sampled in the dark were similar to those in plants treated and sampled in the light.The only change of a biochemical nature detected was a marked reduction in the quantity of starch deposits in chloroplasts. No changes were noted in the mitochondria, Golgi bodies, endoplasmic reticulum or nucleus, or in the composition of the cytoplasm or cell walls of treated tissues.Effets du paraquat sur I'ultrastructure des cellules du mésophylle de Prosopis〈section xml:id="abs1-1"〉〈title type="main"〉ResumeL'action du paraquat (1,1′-diméthyle-4,4′-bipyridylium-2A) sur l'ultrastructure des cellules de mésophylle de Prosopis (P. juliflora (Swartz) DC. var. glandulosa (Torr.) Cockerell) a été eatudiée au moyen des techniques de microscopie électronique. Le premier effet visible provoqué par l'herbicide fut une deasintegration rapide de la membrane cytoplasmique suivie de la rupture des membranes des chloroplastes et de la perte de la turgescence des chloroplastes. Les transformations qui apparurent dans les plantes traitées et conservées a l'obscurité, furent analogues á ceux des plantes traitées et exposées a la lumière.Le seul changement de nature biochimique deacelé fut une reduction marquée de la quantité des dépôts d'amidon dans les chloroplastes. Aucun changement ne fut observe dans les mitochondries, l'appareil de Golgi, le réticulum endoplasmique ou le noyau, pas plus que dans la composition du cytoplasme ou des parois cellulaires des tissus traités.Der Einfluss von Paraquat auf die Feinstruktur von Mesophyllzellen des Honig-Mesquitebaums
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1365-3180.1969.tb01456.x
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  • 2
    Electronic Resource
    Electronic Resource
    Effect of 4-Amino-3,5,6-trichloropicolinic acid on Protein Synthesis (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 27 (1972), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The effects of 4-amino-3,5,6-trichloropicolinic acid (picloram) on protein synthesis in bean (Phaseolus vulgaris L. cv. ‘Astro’) hypocotyl and hook tissues were studied. Picloram (10-4M) was shown to have a stimulatory effect on 14C-1-DL-leucine uptake in hook but not hypocotyl tissues. Maximum leucine incorporation and maximum total protein concentration occurred in hook tissues treated with 10-4M picloram. Inhibition of protein synthesis with cycloheximide (CH) and erythromycin (ERY) indicates that endogenous and picloram-stimulated protein synthesis is a function of the 80S cytoplasmic ribosomes rather than 70S chloroplast or mitochondria ribosomes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1972.tb03627.x
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  • 3
    Electronic Resource
    Electronic Resource
    Subcellular Distribution of Picloram (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 28 (1973), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: Gas chromatographic and radioisotopic analyses were made of cell wall, chloroplast, mitochondria and the remaining cytoplasm fractions of cowpea (Vigna sinensis Endl. cv. Southern Blackeye) trifoliates acropetal to primary leaves treated with the growth regulator 4-amino-3,5,6-trichloro-picolinic acid (picloram). The majority of picloram was recovered from the remaining cytoplasm. Concentrations in chloroplasts and mitochondria were consistently low.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1973.tb01203.x
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  • 4
    Electronic Resource
    Electronic Resource
    Comparative Effects and Concentration of Picloram, 2,4,5-T and Dicamba in Tissue Culture (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 27 (1972), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: In nutrient agar comparative concentrations (10−3 to 10−5M) of (2,4,5-trichlorophenoxy)acetic acid (2,4,5-T) were generally more inhibitory to the growth of tissue cultures of soybean (Glycine max (L.) Merrill cv. Acme) and cottonwood (Populus deltoides Marsh.) than were either 4-amino-3,5,6-trichloropicolinic acid (picloram) or 3,6-dichloro-o-anisic acid (dicamba). Compared to untreated tissue dicamba or picloram at 10−6M in the nutrient agar resulted in a 200 % increase in the growth of soybean tissue. At 10−5 and 10−6M dicamba also produced an increase in the growth of cottonwood tissue. Greatest absorption of picloram and dicamba by tissue cultures from agar occurred during the first 24 h after treatment. However, absorption remained nearly static thereafter for 14 days. More dicamba was absorbed by soybean and cottonwood tissue cultures than either picloram or 2,4,5-T.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1972.tb01137.x
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  • 5
    Electronic Resource
    Electronic Resource
    Pathways of Carbohydrate Catabolism in Senescent and Non-senescent Tobacco Leaves (1968)
    Oxford, UK : Blackwell Publishing Ltd
    Physiologia plantarum 21 (1968), S. 0 
    Details
    ISSN: 1399-3054
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Biology
    Notes: The pathway (s) of glucose degradation in detached senescent and non-senescent tobacco leaves from plants approximately 100 days old were studied utilizing‘Relabeled carbohydrates. Comparable samples of each tissue were allowed to metabolize glucose-1- and glucose-6-14C and C6/C1 ratios were computed from the radioactivity of 14CO2 collected. Two methods of calculation were compared.Hexose monophosphate pathway activity was also compared in both ages of tissue by measuring 14CO2 respired from substrate ribose-1-, xylose-1- and gluconic acid-6-14C.The results indicate that the hexose monophosphate pathway accounts for approximately 25 percent of the respired CO2 in both senescent and non-senescent tissues. Both types of tissue were equally efficient in degrading HMP shunt intermediates to CO2.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1399-3054.1968.tb07229.x
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  • 6
    Electronic Resource
    Electronic Resource
    Thermal and ultraviolet loss of herbicides (1973)
    Springer
    Archives of environmental contamination and toxicology 1 (1973), S. 289-302 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Exposure of free-acid and K+ salts of herbicides picloram, 2, 4, 5-T, and dicamba to 30° C resulted in significant losses of dicamba free-acid and K+ salt and 2, 4, 5-T K+ salt. Exposure to 60° C resulted in significant losses of free-acid and salt 2, 4, 5-T; free-acid and salt dicamba; and free-acid picloram. Long-wave ultraviolet light (356 nm) caused the degradation of free-acid and K+-salt picloram and the K+ salt of 2, 4, 5-T. Ultraviolet degradation of free-acid picloram molecules apparently occurs by a direct interaction of one photon of uv light with each molecule.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01985431
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  • 7
    Electronic Resource
    Electronic Resource
    Ultraviolet and volatility loss of herbicides (1974)
    Springer
    Archives of environmental contamination and toxicology 2 (1974), S. 275-288 
    Details
    ISSN: 1432-0703
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Abstract Herbicide 2,4-D formulated as a urea-type “polymer” was readily destroyed by long-wave uv (356-nm) irradiation, whereas conventional 2,4-D was more resistant. The opposite relationship was noted for “polymeric” and conventional formulations of dicamba. “Polymerized” 2,4-D was more resistant to thermal degradation (60°C) than “non-polymerized” formulations. Ultraviolet degradation of “polymerized” 2,4-D was eliminated by the incorporation of RYLEX-H and UVINUL D-50, industrial uv absorbers. Exposure of “polymeric” dicamba to 60°C heat, followed by trapping of the volatile component, indicated that 21 percent was lost by thermal degradation and 46.6 percent by volatilization. Comparable values for “non-polymerized” dicamba were 37.9 and 60.1 percent.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01956176
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  • 8
    Electronic Resource
    Electronic Resource
    Persistence of 2,4,5-T in grasslands of Texas (1972)
    Springer
    Bulletin of environmental contamination and toxicology 8 (1972), S. 229-233 
    Details
    ISSN: 1432-0800
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Medicine
    Notes: Conclusion The herbicide 2,4,5-T is relatively short lived in Texas grassland ecosystems and does not produce significant residues that persist from one year to the next at the rates and locations studied.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01839517
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  • 9
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    Cloning and expression of the gene cluster encoding key proteins involved in acetyl-CoA synthesis in Clostridium thermoaceticum: CO dehydrogenase, the corrinoid/Fe-S protein, and methyltransferase. (1989)
    National Academy of Sciences
    Details
    Publication Date: 1989-01-01
    Print ISSN: 0027-8424
    Electronic ISSN: 1091-6490
    Topics: Biology , Medicine , Natural Sciences in General
    Published by National Academy of Sciences
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  • 10
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    Response of Kleingrass and Buffelgrass to Herbicides 1 (1980)
    Wiley
    Details
    Publication Date: 1980-01-01
    Print ISSN: 0002-1962
    Electronic ISSN: 1435-0645
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Published by Wiley
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