scholarly journals Selection for the Composition of the Charge with Minimal Heat Consumption for Smelting Low- Phosphorus Slag

2021 ◽  
Vol 145 (3) ◽  
pp. 24-31
Author(s):  
O. S. Vodennikova ◽  
◽  
O. B. Matyasheva ◽  
L. V. Vodennikova ◽  
◽  
...  
Keyword(s):  
Heat Consumption ◽  
Low Phosphorus ◽  
Selection For

Acid phosphatase activity of intact roots and phosphorus nutrition in plants. 2. Variations among wheat roots

1980 ◽  
Vol 31 (3) ◽  
pp. 441 ◽  
Author(s):  
KD McLachlan
Keyword(s):  
Phosphatase Activity ◽  
Optical Density ◽  
Geographic Origin ◽  
Phosphorus Uptake ◽  
Low Fertility ◽  
Fresh Weight ◽  
Phosphatase Activities ◽  
Low Phosphorus ◽  
Phosphorus Status ◽  
Selection For

Variation in phosphatase activity (E.C. 3.1.3.41) in some cultivated wheats and wild progenitors was examined and a comparison made. The limits likely to occur in wheat were estimated, and the usefulness of phosphatase activity as an indicator of plant potential for exploiting low phosphorus status situations was explored. Under the test conditions, within the cultivated wheats, the phosphatase activity varied in optical density from 4.6 to 9.3 per g fresh weight (P < 0.001), and selections among wheats on this basis could be made. Phosphorus uptake and total dry matter yield were negatively related to phosphatase activity (r = - 0.80 and - 0.82 respectively, each P < 0.00l), providing further supportive evidence of the proposition that plants with lower phosphatase activities may gain and use phosphorus more readily than plants with higher ones. The phosphatase activity of wild and cultivated progenitors of modern wheats ranged in optical density from 15.5 to 45.4 per g fresh weight. All the cultivated species had low phosphatase activities which, on the basis of the proposition, suggests that some unconscious selection for ability to use low fertility situations may have occurred with the domestication of wheat. On the other hand, there was no apparent grouping according to geographic origin of earlier cultivars used in Australia with respect to phosphatase activity to suggest any conscious selection for ability to grow well on low phosphorus status soils.

scholarly journals PHENOTYPIC AND GENETIC PARAMETERS ESTIMATED FOR FRESH CORN UNDER DIFFERENT NUTRIENT AVAILABILITY1

2021 ◽  
Vol 34 (4) ◽  
pp. 752-762
Author(s):  
CECÍLIA LEÃO PEREIRA RESENDE ◽  
JULIANA BEZERRA MARTINS ◽  
FELIPE RIBEIRO ILARIA ◽  
CARLA MARIANE MACHADO DOS SANTOS ◽  
FABRICIO RODRIGUES
Keyword(s):  
Nutrient Availability ◽  
Nitrogen Availability ◽  
Genetic Parameters ◽  
Recurrent Selection ◽  
P Availability ◽  
Breeding Programs ◽  
Low Phosphorus ◽  
P Rate ◽  
Selection For ◽  
Low Nitrogen

ABSTRACT The objective of this work was to estimate and compare phenotypic and genetic parameters after three cycles of intrapopulation recurrent selection for fresh corn grown under three nutrient availability conditions. Three experiments derived from the same population (MV-003) were conducted to assess the ability of progenies to absorb nutrients, one under adequate fertilization (control; MV-006), one under low nitrogen availability (N; MV-006N), and one under low phosphorus availability (P; MV-006P). The experiments were carried out in randomized blocks, with 64 half-sib progenies and three replications for each nutritional condition. Chlorophyll index, plant height, ear insertion, ear diameter, ear length, unhusked ear yield, and marketable husked ear were evaluated. The populations showed variability for the three nutrient availability conditions. The variability reduced after only three selection cycles; thus, evaluating a higher number of half-sib progenies, above 64, under low N and P availability is indicated. The rates used to identify the most efficient progenies in breeding programs should be close to the appropriate one, with a slow reduction after the selection cycles. The variability will be thus maintained, with a greater possibility of identifying more promising progenies. In addition, the frequency of favorable alleles increases more gradually and effectively. The N and P rate of 60 kg ha-1 is not indicated as a critical level for the initial phase of the program.

Framework for Selecting Vocabulary for Preliterate Children Who Use Augmentative and Alternative Communication

2019 ◽  
Vol 28 (3) ◽  
pp. 1000-1009
Author(s):  
Allison Bean ◽  
Lindsey Paden Cargill ◽  
Samantha Lyle
Keyword(s):  
Language Impairment ◽  
Augmentative And Alternative Communication ◽  
Developmentally Appropriate ◽  
School Age Children ◽  
Alternative Communication ◽  
School Based ◽  
Selection For ◽  
Nonverbal Children ◽  
Grammatical Structures ◽  
Insufficient Knowledge

Purpose Nearly 50% of school-based speech-language pathologists (SLPs) provide services to school-age children who use augmentative and alternative communication (AAC). However, many SLPs report having insufficient knowledge in the area of AAC implementation. The objective of this tutorial is to provide clinicians with a framework for supporting 1 area of AAC implementation: vocabulary selection for preliterate children who use AAC. Method This tutorial focuses on 4 variables that clinicians should consider when selecting vocabulary: (a) contexts/environments where the vocabulary can be used, (b) time span during which the vocabulary will be relevant, (c) whether the vocabulary can elicit and maintain interactions with other people, and (d) whether the vocabulary will facilitate developmentally appropriate grammatical structures. This tutorial focuses on the role that these variables play in language development in verbal children with typical development, verbal children with language impairment, and nonverbal children who use AAC. Results Use of the 4 variables highlighted above may help practicing SLPs select vocabulary that will best facilitate language acquisition in preliterate children who use AAC.

Teaching Partners to Support Communication for Adults with Acquired Communication Impairment

2013 ◽  
Vol 22 (1) ◽  
pp. 4-15 ◽  
Author(s):  
Laura J. Ball ◽  
Joanne Lasker
Keyword(s):  
Practice Patterns ◽  
Communicative Competence ◽  
Communication Disorders ◽  
Communication Impairment ◽  
Communication Partner ◽  
Communication Partners ◽  
Selection For ◽  
Communication Needs ◽  
End Of Life Communication ◽  
Lateral Sclerosis

Abstract For adults with acquired communication impairment, particularly those who have communication disorders associated with stroke or neurodegenerative disease, communication partners play an important role in establishing and maintaining communicative competence. In this paper, we assemble some evidence on this topic and integrate it with current preferred practice patterns (American Speech-Language-Hearing Association, 2004). Our goals are to help speech-language pathologists (SLPs) identify and describe partner-based communication strategies for adults with acquired impairment, implement evidence-based approaches for teaching strategies to communication partners, and employ a Personnel Framework (Binger et al., 2012) to clarify partners? roles in acquiring and supporting communication tools for individuals with acquired impairments. We offer specific guidance about AAC techniques and message selection for communication partners involved with chronic, degenerative, and end of life communication. We discuss research and provide examples of communication partner supports for person(s) with aphasia and person(s) with amyotrophic lateral sclerosis who have complex communication needs.

Identifying Measurement Invariant Item Sets in Cross-Cultural Settings Using an Automated Item Selection Procedure

Methodology ◽  
2018 ◽  
Vol 14 (4) ◽  
pp. 177-188 ◽  
Author(s):  
Martin Schultze ◽  
Michael Eid
Keyword(s):  
Measurement Invariance ◽  
Optimal Solution ◽  
Selection Procedure ◽  
Cross Cultural ◽  
Item Selection ◽  
Ant System ◽  
Item Quality ◽  
Ant System Algorithm ◽  
Selection For ◽  
Selection Of

Abstract. In the construction of scales intended for the use in cross-cultural studies, the selection of items needs to be guided not only by traditional criteria of item quality, but has to take information about the measurement invariance of the scale into account. We present an approach to automated item selection which depicts the process as a combinatorial optimization problem and aims at finding a scale which fulfils predefined target criteria – such as measurement invariance across cultures. The search for an optimal solution is performed using an adaptation of the [Formula: see text] Ant System algorithm. The approach is illustrated using an application to item selection for a personality scale assuming measurement invariance across multiple countries.

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