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Upright dieback disease of cranberry, Vaccinium macrocarpon Ait. : casual agents and infection courts.
Genetic Studies of Sulfadiazine-resistant and Methionine-requiring \u3cem\u3eNeisseria\u3c/em\u3e Isolated From Clinical Material
Deoxyribonucleate (DNA) preparations were extracted from Neisseria meningitidis (four isolates from spinal fluid and blood) and N. gonorrhoeae strains, all of which were resistant to sulfadiazine upon primary isolation. These DNA preparations, together with others from in vitro mutants of N. meningitidis and N. perflava, were examined in transformation tests by using as recipient a drug-susceptible strain of N. meningitidis (Ne 15 Sul-s Met+) which was able to grow in a methionine-free defined medium. The sulfadiazine resistance typical of each donor was introduced into the uniform constitution of this recipient. Production of p-aminobenzoic acid was not significantly altered thereby. Transformants elicited by DNA from the N. meningitidis clinical isolates were resistant to at least 200 ÎŒg of sulfadiazine/ml, and did not show a requirement for methionine (Sul-r Met+). DNA from six strains of N. gonorrhoeae, which were isolated during the period of therapeutic use of sulfonamides, conveyed lower degrees of resistance and, invariably, a concurrent methionine requirement (Sul-r/Metâ). The requirement of these transformants, and that of in vitro mutants selected on sulfadiazine-agar, was satisfied by methionine, but not by vitamin B12, homocysteine, cystathionine, homoserine, or cysteine. Sul-r Met+ and Sul-r/Metâ loci could coexist in the same genome, but were segregated during transformation. On the other hand, the dual Sul-r/Metâ properties were not separated by recombination, but were eliminated together. DNA from various Sul-r/Metâ clones tested against recipients having nonidentical Sul-r/Metâ mutant sites yielded Sul-s Met+ transformants. The met locus involved is genetically complex, and will be a valuable tool for studies of genetic fine structure of members of Neisseria, and of genetic homology between species
Games in Agriculture, Food, and Natural Resources Education
Educational games provide learners with team-based, experiential, and problem-centered learning opportunities. Therefore, educational games are recommended to encourage learner success in an increasingly complex and collaborative world. Research exploring interventions to increase teacher affinity toward games is needed to inform expansion of games within classrooms. The current study leveraged the input, environment, and outcomes model to analyze perceptions of games held by school-based agriculture, food, and natural resources (AFNR) educators before and after a professional development experience focused on educational games. Results indicate teachers held a favorable perception of games before engaging in the professional development. Engagement in the professional development was related to only minimal increases in the perceptions held by teachers regarding educational games. Importantly, individual items within the construct illuminate an expanded view of educational games and their utility within AFNR classrooms as a result of the professional development experience. Specifically, respondents saw educational games as being valuable to engage learners in new content, not just as a review tool. Findings suggest a professional development experience related to games may help expand teacher conceptualizations of educational game utility. Specific recommendations are included to expand teacher understanding and use of educational games
Computational Fluid Dynamics in Small Airway Models of the Human Lung
The promise of gene replacement therapy for cystic fibrosis, the administration of drugs via inhalation therapy, and die deposition location of man-made airborne particulates all involve a more complete understanding of the fluid dynamics in the human lung. Flow in the larger airways may be measured through life-sized models directly, but the airways in the peripheral lung are too small and the flows are too complex to be studied in this manner. Computational models can be developed which will accurately represent both the geometric nature of the central airways and the fluid dynamics with in them. Two-dimensional and three-dimensional models of central lung airway bifurcations were developed based on morphometry. These models were used as the spatial basis upon which the differential equations that describe incompressible flow, the Navier Stokes equations, are solved. Flow solutions have been computed at Reynolds numbers from 1000 down to 100. Solutions for single and double bifurcations agree with the experimental data for flow in a branching tube. These studies are being extended to multiple bifurcations in three dimensions
Hermitian symmetric polynomials and CR complexity
Properties of Hermitian forms are used to investigate several natural
questions from CR Geometry. To each Hermitian symmetric polynomial we assign a
Hermitian form. We study how the signature pairs of two Hermitian forms behave
under the polynomial product. We show, except for three trivial cases, that
every signature pair can be obtained from the product of two indefinite forms.
We provide several new applications to the complexity theory of rational
mappings between hyperquadrics, including a stability result about the
existence of non-trivial rational mappings from a sphere to a hyperquadric with
a given signature pair.Comment: 19 pages, latex, fixed typos, to appear in Journal of Geometric
Analysi
Entire curves avoiding given sets in C^n
Let be a proper closed subset of and
at most countable (). We give conditions
of and , under which there exists a holomorphic immersion (or a proper
holomorphic embedding) with .Comment: 10 page
Next generation of consumer aerosol valve design using inert gases
The current global consumer aerosol products such as deodorants, hairsprays, air-fresheners, polish, insecticide, disinfectant
are primarily utilised unfriendly environmental propellant of liquefied petroleum gas (LPG) for over three decades.
The advantages of the new innovative technology described in this paper are: (i) no butane or other liquefied
hydrocarbon gas; (ii) compressed air, nitrogen or other safe gas propellant; (iii) customer acceptable spray quality and
consistency during can lifetime; (iv) conventional cans and filling technology. Volatile organic compounds and greenhouse
gases must be avoided but there are no flashing propellants replacements that would provide the good atomisation and
spray reach. On the basis of the energy source for atomising, the only feasible source is inert gas (i.e. compressed air),
which improves atomisation by gas bubbles and turbulence inside the atomiser insert of the actuator. This research
concentrates on using âbubbly flowâ in the valve stem, with injection of compressed gas into the passing flow, thus also
generating turbulence. Using a vapour phase tap in conventional aerosol valves allows the propellant gas into the liquid
flow upstream of the valve. However, forcing bubbly flow through a valve is not ideal. The novel valves designed here,
using compressed gas, thus achieved the following objectives when the correct combination of gas and liquid inlets to the
valve, and the type and size of atomiser âinsertâ were derived:
1. Produced a consistent flow rate and drop size of spray throughout the life of the can, compatible with the current
conventional aerosols that use LPG: a new âconstancyâ parameter is defined and used to this end.
2. Obtained a discharge flow rate suited to the product to be sprayed; typically between 0.4 g/s and 2.5 g/s.
3. Attained the spray droplets size suited to the product to be sprayed; typically between 40 mm and 120 mm
Immunolocalization of an Amino-Terminal Fragment of Apolipoprotein E in the Pick\u27s Disease Brain
Although the risk factor for apolipoprotein E (apoE) polymorphism in Alzheimer\u27s disease (AD) has been well described, the role that apoE plays in other neurodegenerative diseases, including Pick\u27s disease, is not well established. To examine a possible role of apoE in Pick\u27s disease, an immunohistochemical analysis was performed utilizing a novel site-directed antibody that is specific for an amino-terminal fragment of apoE. Application of this antibody, termed the amino-terminal apoE cleavage fragment (nApoECF) antibody, consistently labeled Pick bodies within area CA1 of the hippocampus in 4 of the 5 cases examined. Co-localization of the nApoECF antibody with PHF-1, a general marker for Pick bodies, as well as with an antibody to caspase-cleaved tau (TauC3) was evident within the hippocampus. While staining of the nApoECF antibody was robust in area CA1, little co-localization with PHF-1 in Pick bodies within the dentate gyrus was observed. A quantitative analysis indicated that approximately 86% of the Pick bodies identified in area CA1 labeled with the nApoECF antibody. The presence of truncated apoE within Pick bodies suggests a broader role of apoE beyond AD and raises the question as to whether this protein contributes to pathogenesis associated with Pick\u27s disease
Convergence of random zeros on complex manifolds
We show that the zeros of random sequences of Gaussian systems of polynomials
of increasing degree almost surely converge to the expected limit distribution
under very general hypotheses. In particular, the normalized distribution of
zeros of systems of m polynomials of degree N, orthonormalized on a regular
compact subset K of C^m, almost surely converge to the equilibrium measure on K
as the degree N goes to infinity.Comment: 16 page
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