خيارات البحث
النتائج 1 - 10 من 3,862
Transfer-factor and its role in the cell-determined immunity
1992
Arnaudov, A. (Rajonen Veterinaren Institut, Plovdiv (Bulgaria))
The digestibility in rabbit. Comparison between the ADC determined with traditional method and mixed excreta
1992
Gioffre, F. | Di Francia, A. | Masucci, F. | Proto, V. (Naples Univ., Portici (Italy). Dipartimento di Scienza della Produzione Animale)
Degradation of the herbicide mecoprop in an aerobic aquifer determined by laboratory batch studies.
1992
Heron G. | Christensen T.H.
Mathematical methods to maximize the overall multiplication ratio of micropropagation in a determined period.
1992
Hara M. | Kozai T.
The within-panicle flowering sequence in Panicum maximum. 1. A well-determined process [spikelet distribution]
1992
Noirot, M. (Institut Francais de Recherche Scientifique pour le Developpement en Cooperation, Montpellier (France). Laboratoire des Ressources Genetiques et d'Amelioration des Plantes Tropicales)
Survey of sulphites determined in a variety of foods by the optimized Monier-Williams method
1992
Daniels, D.H. | Joe, F.L. Jr. | Warner, C.R. | Longfellow, S.D. | Fazio, T. | Diachenko, G.W. (Division of Food Chemistry and Technology, US Food and Drug Administration, Washington, DC 20204 (USA))
The Maryland Mammoth allele and rooting both perturb the fate of florally determined apices in Nicotiana tabacum
1992
Smith, S.M.E. | McDaniel, C.N.
The stability of the florally determined state in terminal and axillary buds of two tobacco cultivars was studied. We used Hicks and Hicks Maryland Mammoth, near-isogenic cultivars of Nicotiana tabacum differing at the recessive maryland mammoth locus which confers short-day behavior. The experimental design consisted of growing plants in short-day conditions and subjecting them to three bioassays in long-day conditions: in vitro culture of apices consisting of meristems and three to four leaf primordia; rooting of buds consisting of meristems and 8 to 12 leaves, leaf primordia, and internodes; and release from apical dominance of axillary buds in situ. Cultured terminal and axillary apices expressed floral determination, indicating that meristems can be florally determined. Two lines of evidence indicate that rooting destabilizes an already acquired florally determined state: cultured apices from both axillary and terminal buds produced fewer nodes after excision than homologous buds which were rooted; and a lower percentage of rooted axillary buds from Hicks Maryland Mammoth plants expressed floral determination than did homologous axillary buds grown out in situ in noninductive conditions. Rooted buds from the two genotypes expressed floral determination at different frequencies, but produced abnormal inflorescences at similar frequencies, indicating that roots and the maryland mammoth allele influence common as well as unique processes associated with floral determination.
اظهر المزيد [+] اقل [-]Survey of sulphites determined in a variety of foods by the optimized Monier-Williams method
1992
Daniels, D.H. | Joe, F.L. Jr | Warner, C.R. | Longfellow, S.D. | Fazio, T. | Diachenko, G.W.
A survey of sulphite levels in a variety of foods including dried fruit, dried mashed potatoes, shrimp, canned mushrooms and fruit juices has been conducted. The levels found ranged from 0 ppm in orange juice to 3722 ppm as sulphur dioxide in dried fruit. The foods were analysed by the optimized Monier-Williams procedure.
اظهر المزيد [+] اقل [-]Localization of spectral receptors in the ommatidium of butterfly compound eye determined by polarization sensitivity
1992
Bandai, K. | Arikawa, K. | Eguchi, E.
A butterfly Papilio has 5 types of spectral receptors in the compound eye. The spectral sensitivity of each type peaks in the UV, violet, blue, green, and red wavelengths, respectively. The green type contains two subtypes with and without a UV secondary peak. Here we studied the localization of these spectral receptors within the ommatidium. An ommatidium contains 9 photoreceptors (R1-9), each of which is one of the 5 spectral receptor types. The photoreceptors bear parallel microvilli to form a non-twisted rhabdom, and thereby the photoreceptors are polarization sensitive. We first examined the microvillar orientation by electron microscopy. The microvilli of R1, 2, and 9 are oriented dorso-ventrally (0 degrees), whereas those of R3 and 4 are parallel to the antero-posterior axis (90 degrees). The R5-8 bear microvilli diagonally: 45 degrees for R6 and R8, 135 degrees for R5 and R7. We then recorded spectral and polarization sensitivities from single photoreceptors. The peak angle of the polarization sensitivity of the UV, violet, and blue receptors were around 0 degrees, whereas that of the green receptors was around 90 degrees. In the double-peaked green receptors, the peak angle of the polarization sensitivity at UV was also around 90 degrees. The red receptors showed a peak angle of the polarization sensitivity at around 35 degrees. The polarization sensitivity ratio (PSmax/PSmin) of the double-peaked green receptors measured at UV was around 4, whereas the ratio of other receptors was around 2. We conclude that R1 and R2 are either UV, violet, or blue receptors whereas R3 and R4 are green receptors. Some R6 and R8 are red receptors. We also conclude that the UV secondary peak in the double-peaked green receptor is not simply attributable to the coupling with UV receptors.
اظهر المزيد [+] اقل [-]The incidence of sub-clinical mastitis in Swaziland dairy herds as determined by two screening tests
1992
Okello-Uma, I.
