Glomus globiferum孢子的个体发育研究     

Wu  CG Sylv.  DM 《绵阳农专学报》1994,11(1):63-64

  相似文献   

Effect of TEX-OE® treatment on the development of heat shock proteins in commercial broiler chicks and the impact on performance indicators in the grow-out period     

C. D. Parker  C. Prins  C. Saliba  G. Gutierrez  M. Serrar 《British poultry science》2014,55(5):592-597

1. Heat shock proteins (HSPs) are highly conserved proteins, shown to protect organisms against physical and physiological stress.

2. TEX-OE^® is a patented total extract of the fruit of Opuntia ficus indica, which has been demonstrated to accelerate the development of HSPs in several animal species.

3. One-day-old commercial broiler chicks were treated with TEX-OE^®; HSP was measured by enzyme-linked immunosorbent assay (ELISA), and a large commercial field trial investigated key performance indicators (KPIs) in treated versus untreated controls chicks.

4. TEX-OE^® significantly increased HSP concentrations in treated chicks versus controls. Final cumulative mortality, liveweight and percentage factory-rejects were better than in controls.

5. The accelerated HSP response may enable chicks to cope with early stressors, which is reflected in improved KPIs.  相似文献   

Genetics of Seed Yield and Its Components in Common Beans (Phaseolus vulgaris L.) of Andean Origin     

S. P. Singh    H. Teran    A. Molina  J. A. Gutierrez 《Plant Breeding》1991,107(3):254-257

A broad spectrum of rapeseed (rape) lines as well as resynthesized (resyn) genotypes of B. napus were analyzed for their contents of sinapoyl esters. In the rape material the concentrations varied between 17.8 and 71.9 μol/g defatted seed meal and exhibited a heritability of h²= 0.6. The resyn genotypes showed an even smaller variation but had a similar heritability. Therefore, no additional, immediately usable, genotypes with low sinapoyl ester concentrations could be created by a resynthesis.  相似文献   

Developmental behaviors: delayed appearance in monkeys asphyxiated at birth     

Sechzer JA  Faro MD  Barker JN  Barsky D  Gutierrez S  Windle WF 《Science (New York, N.Y.)》1971,172(3989):1221

In "Developmental behaviors: delayed appearance in monkeys asphyxiated at birth" by J. A. Sechzer et al. (19 Mar., p. 1173), the last two lines of column 1 and the first five lines of column 2, page 1175, should read "Deficits in learning and memory (10, 11) when compared with the establishment of these developmental behaviors (although significantly delayed) suggest that brain damage by neonatal asphyxia can result in a degree of dissociation..."  相似文献   

Observation of Interference Between Two Bose Condensates     

MR Andrews  CG Townsend  H Miesner  DS Durfee  DM Kurn  W Ketterle 《Science (New York, N.Y.)》1997,275(5300):637-641

Interference between two freely expanding Bose-Einstein condensates has been observed. Two condensates separated by approximately 40 micrometers were created by evaporatively cooling sodium atoms in a double-well potential formed by magnetic and optical forces. High-contrast matter-wave interference fringes with a period of approximately 15 micrometers were observed after switching off the potential and letting the condensates expand for 40 milliseconds and overlap. This demonstrates that Bose condensed atoms are "laser-like"; that is, they are coherent and show long-range correlations. These results have direct implications for the atom laser and the Josephson effect for atoms.  相似文献   

Independently evolved virulence effectors converge onto hubs in a plant immune system network     

Mukhtar MS  Carvunis AR  Dreze M  Epple P  Steinbrenner J  Moore J  Tasan M  Galli M  Hao T  Nishimura MT  Pevzner SJ  Donovan SE  Ghamsari L  Santhanam B  Romero V  Poulin MM  Gebreab F  Gutierrez BJ  Tam S  Monachello D  Boxem M  Harbort CJ  McDonald N  Gai L  Chen H  He Y;European Union Effectoromics Consortium  Vandenhaute J  Roth FP  Hill DE  Ecker JR  Vidal M  Beynon J  Braun P  Dangl JL 《Science (New York, N.Y.)》2011,333(6042):596-601

Plants generate effective responses to infection by recognizing both conserved and variable pathogen-encoded molecules. Pathogens deploy virulence effector proteins into host cells, where they interact physically with host proteins to modulate defense. We generated an interaction network of plant-pathogen effectors from two pathogens spanning the eukaryote-eubacteria divergence, three classes of Arabidopsis immune system proteins, and ~8000 other Arabidopsis proteins. We noted convergence of effectors onto highly interconnected host proteins and indirect, rather than direct, connections between effectors and plant immune receptors. We demonstrated plant immune system functions for 15 of 17 tested host proteins that interact with effectors from both pathogens. Thus, pathogens from different kingdoms deploy independently evolved virulence proteins that interact with a limited set of highly connected cellular hubs to facilitate their diverse life-cycle strategies.  相似文献   

Influence of Osteopontin in Bovine Uterine Tube Fluid on Sperm Binding and Fertilization in RCA-1 Lectin-treated Oocytes     

RF Gonçalves  CG Wolinetz  VH Barnabe  GJ Killian 《Reproduction in domestic animals》2009,44(1):152-155

This study was conducted to determine the effect of pre‐exposure of oocytes to Ricinus communis (RCA‐1) lectin and osteopontin (OPN) in uterine tube fluid (UTF) on in vitro sperm–egg binding and fertilization. In vitro‐matured bovine oocytes were incubated (39°C, 5% CO₂ in air) for 2 h in the following treatments: (i) 500 μl of fertilization medium (FM); (ii) 250 μl of FM with 0.25 ml of non‐luteal ampullary uterine tube fluid (NLAUTF); (iii) 250 μl of FM with 250 μl of NLAUTF and 4 μl of RCA‐1 lectin; (iv) 250 μl of FM with 250 μl of NLAUTF, a rabbit polyclonal antibody (1:200) against purified bovine milk OPN, and RCA‐1 lectin; (v) 500 μl of FM and RCA‐1 lectin. Following incubation, oocytes were washed, placed in FM with 2 μg heparin, and incubated with 1 × 10⁵ frozen–thawed spermatozoa per 10 oocytes. Oocytes used to assess sperm binding were stained with Hoescht 33342, and the number of sperm bound per zona pellucida counted. The remaining oocytes were fixed in acid alcohol, stained with 1% acetate‐orcein and observed to determine the presence of pronuclei. More sperm bound to the zona pellucida (mean ± SEM) when oocytes were incubated in treatment 3 (59.0 ± 5.5) than in treatments 2 (46.4 ± 5.6), 4 (18.1 ± 5.4), 5 (33.4 ± 5.6) or 1 (32.5 ± 5.6). More oocytes were fertilized when incubated in treatment 3 (91% ± 3.0) than in 2 (84% ± 3.0), 4 (40% ± 3.0), 5 (77% ± 3.0) or 1 (76% ± 3.0). As in previous studies, this study suggests that RCA‐1 lectin enhances binding of UTF‐derived OPN to bovine oocytes, resulting in increased sperm–egg binding and fertilization in vitro and a possible role in fertilization.  相似文献   

Frozen and Unfrozen Water Contents of Wheat Flours and Their Components     

Alma Delia Roman‐Gutierrez  Stphane Guilbert  Bernard Cuq 《Cereal Chemistry》2002,79(4):471-475

The properties of frozen and unfrozen water in two different wheat flours (hard and soft), and in their main components (gluten, starch, damaged starch, water‐soluble and water‐insoluble pentosans), were described using modulated differential scanning calorimetry (DSC). As a reference, enthalpy values of crystallization (298 J/g) and melting (335 J/g) of pure water were determined from the total heat flow curves. The separation of thermal events between the reversing and nonreversing heat flows with modulated DSC was not effective due to disturbances in the modulated temperature scan. For wheat flours and their components, linear regressions described well the changes in frozen water content calculated from enthalpies of freezing (R² = 0.970–0.982) or melting (R² = 0.783–0.996). The unfrozen water content (UFWC) calculated for the hard wheat flour (29–31%, db) was close to that calculated for the soft wheat flour (30–32%). The UFWC of wheat gluten (38–47%), starch (38–42%), damaged starch (37–40%), water‐soluble pentosans (51%), and water‐insoluble pentosans (40–44%) were higher than the corresponding values for the flours. The simple summation of the contributions of each component cannot be used to estimate the overall behavior of flours.  相似文献   

Contribution of Specific Flour Components to Water Vapor Adsorption Properties of Wheat Flours     

Alma Delia Roman‐Gutierrez  Frdric Mabille  Stphane Guilbert  Bernard Cuq 《Cereal Chemistry》2003,80(5):558-563

The dynamic water vapor adsorption properties were determined for two wheat flours (hard wheat flour and soft wheat flour) and compared with those of flour components (starch, damaged starch, gluten, water‐soluble pentosans, and water‐insoluble pentosans). Water vapor adsorption rates were determined from the changes in sample mass as a function of time during hydration after a step increase in relative humidity (rh). It was not possible to significantly discriminate the selected products by initial rates of adsorption (5.1 × 10^‐2 to 6.4 × 10^‐2 g/100 g of dry matter/min), except the water‐insoluble pentosans that were characterized by high values of adsorption rates (14 × 10^‐2 g/100 g of dry matter/min). Changes in initial relative humidity conditions and %rh step sizes induced significant changes in adsorption rates. Calculations of apparent water diffusion coefficients were done using a derived form of Fick's law for polydisperse spherical particles. Apparent water diffusion coefficients (at 25°C and 60% rh) were estimated between 2.19 × 10^‐15 and 3.72 × 10^‐15 m²/sec for the selected wheat flours. Water‐insoluble pentosans are characterized by the highest values of diffusion coefficients (1.53 × 10^‐13 m²/sec) when compared with the other wheat components. The calculated values of apparent water diffusion coefficient were discussed in regard to experimental conditions.  相似文献