scholarly journals A further induction of melanism in the lepidopterous Insect, S elenia biiunaria esp., and its inheritance

1928 ◽  
Vol 102 (718) ◽  
pp. 338-347 ◽  
Keyword(s):  
Active Agent ◽  
Early Date ◽  
Adequate Supply ◽  
Lead Salts ◽  
Experimental Induction ◽  
Acid Radical ◽  
The Subject ◽  
Open Question

The subject of the experimental induction of melanism in the Lepidoptera, by feeding the larvæ of the species employed on food artificially charged with manganese or lead salts, has already been discussed in a former paper (Harrison and Garrett, 1926). However, as was definitely indicated in the concluding sentences of that contribution, the work left it quite an open question whether one had to look upon the metal or the acid radical in the compound supplied, as the active agent in bringing about the induction. Recognising this, we stated that further researches were contemplated on similar lines at an early date, to settle the matter. A few months after the conclusion of the earlier work I came into possession of an adequate supply of pupae of Selenia biiunaria (the Early Thorn), collected in the mountain district between Saxony and Czechoslovakia, and I determined to commence the work at once, restricting the investigation to the effects of the metal manganese. Since the manganese salt -used in the former investigation had been the sulphate, in the newer experiments recourse was made to the chloride.

scholarly journals The formation and constitution of crystals of lead salts containing water-soluble colloid

1935 ◽  
Vol 235 (749) ◽  
pp. 125-164 ◽  
Keyword(s):  
Selective Adsorption ◽  
Water Soluble ◽  
Lead Salts ◽  
The Subject ◽  
As If ◽  
Saturated Solutions

The influence of small amounts of dissolved foreign substances on the growth of crystals from saturated solutions has been the subject of much investigation. Usually the added substances have been electrolytes. Dyestuffs have not been neglected, but with some few exceptions comparatively little attention has been given to the effect of non-ionized water-soluble electrolytes such as gelatine or dextrine. As a rule, the presence of the foreign substances is found to cause the crystals to assume a different habit. Whenever this occurs the absorption must have occurred on certain crystal-faces in preference to others, but, although the added material is active by virtue of its close attachment to such faces, it is rarely found to be incorporated into the solid to any great extent. The growing crystals appear to reject the impurity—thrusting it outwards as the growth advances. The action of water-soluble colloids on the halides and certain other salts of lead is exceptional in several ways. Although when such colloids are present in small concentrations one can generally observe a modification of habit, at higher concentrations there may be little selective adsorption, and the result may be a rounded crystal on which no plane faces at all can be distinguished, as if the forces by which atoms are attracted to the structure had been equalized in every direction.

The Use of the Escape Room as a Methodology for the Development of Professional Skills in the Training of Future Teachers

2022 ◽  
pp. 280-302
Author(s):  
Miguel Ángel Gallardo-Vigil ◽  
María de Fátima Poza-Vílches ◽  
María Teresa Pozo-Llorente
Keyword(s):  
Professional Development ◽  
Active Agent ◽  
Essential Elements ◽  
Future Application ◽  
Educational Context ◽  
Future Teachers ◽  
Educational Activities ◽  
Global Pandemic ◽  
The Subject ◽  
New Generation

Faced with the new educational context that is emerging at this time in history, marked by a global pandemic, the learning and application of active methodologies where the teacher is not the only active agent in socio-educational activities is becoming key. Given this novel context, this chapter tries to outline how an escape room can be used as a strategy in the training of future teachers for the development of socio-emotional, sustainable, and multi-intelligence approaches, all currently necessary and essential elements of the professional development of this new generation of teachers in training. There is no doubt that the experience described in this chapter shows the applicability of these types of active methodologies in the classroom, since as defended in the document, it not only favours the motivation of students, but also the acquisition of certain skills and abilities, as well as the consolidation of theoretical content linked to the subject in which it is applied, thus favouring their future application when they become practising teachers.

XXXII. Description of the ancient Building at Norwich, which is the subject of the preceding Paper. By John Adey Repton, Esq. F.A.S. In a Letter to the Rev. John Brand, Secretary

Archaeologia ◽  
1806 ◽  
Vol 15 ◽  
pp. 333-337
Author(s):  
John Adey Repton
Keyword(s):  
Preceding Paper ◽  
Early Date ◽  
History Of ◽  
The Subject

When I was in Norwich, in July last, I made some drawings of a building then pulling down, and since almost destroyed. As the style and character of this building is of singular beauty, for the early date to which I suppose it to belong, I shall only describe the parts, by a reference to the drawings; after transcribing the following extract from Blomefield's History of Norfolk.

scholarly journals Swedish preschool staff’s descriptions of technology

2015 ◽  
Vol 3 (2) ◽  
pp. 237-257 ◽  
Author(s):  
Pernilla Sundqvist ◽  
Tor Nilsson ◽  
Peter Gustafsson
Keyword(s):  
Content Analysis ◽  
Full Text ◽  
Day Care ◽  
Preschool Teachers ◽  
Research Results ◽  
Children’S Learning ◽  
The Subject ◽  
Conventional Content Analysis ◽  
Open Question ◽  
Preschool Staff

With regards to previous research results on how the teacher’s/preschool teacher’s understanding of a subject effects children’s learning and apprehending of the subject combined with the difficulties for the technology subject to take place in preschool this study aims at investigating how preschool staff (including preschool teachers and day care attendants) describe technology. A qualitatively designed questionnaire was sent out to 139 preschool teachers and day care attendants in a Swedish municipality, whereof 102 answered. The open question about what technology is thought to be was analyzed using a conventional content analysis resulting in nine categories, of which six interrelated hierarchically and one contained answers witch could not be categorized. Thus the result shows eight different ways in which technology is described, from a simple and naive description to a more complex description that implicates a deeper understanding of technology. A majority describes technology according to the latter. The result also shows that it is mainly the preschool teachers who describe technology in a more complex way. Many of the respondents have trouble separating technology from science, and quite a few describes technology as technique, which is another meaning for the word in the Swedish language. FULL TEXT IN SWEDISH.

Joseph Maiden and the National and Transnational Circulation of Wattle Acacia spp.

2010 ◽  
Vol 21 (1) ◽  
pp. 35 ◽  
Author(s):  
Jodi Frawley
Keyword(s):  
South Africa ◽  
Nineteenth Century ◽  
Twentieth Century ◽  
New Zealand ◽  
Active Agent ◽  
Global Market ◽  
Early Years ◽  
Commercial Development ◽  
Major Producer ◽  
The Subject

During the nineteenth century and in the early years of the twentieth century wattle was circulated by botanists, botanical institutions, interested individuals, commercial seedsmen and government authorities. Wattle bark was used in the production of leather and was the subject of debate regarding its commercial development and conservation in Australia. It was also trialled in many other locations including America, New Zealand, Hawaii and Russia. In the process, South Africa became a major producer of wattle bark for a global market. At the same time wattle was also promoted as a symbol of Australian nationalism. This paper considers this movement of wattles, wattle material and wattle information by examining the career of one active agent in these botanical transfers: Joseph Maiden. In doing so it demonstrates that these seemingly different uses of the wattle overlap transnational and national spheres.

DETERMINING THE NATURE OF COMPETITION IN BULGARIAN FOOD INDUSTRY

2019 ◽  
pp. 505-513
Author(s):  
Valentina Nikolova-Alexieva
Keyword(s):  
Food Safety ◽  
Food Industry ◽  
Depth Information ◽  
Competitive Advantages ◽  
The European Union ◽  
The Subject ◽  
Safety Systems ◽  
Open Question ◽  
The Relationship ◽  
The Competitiveness Of Enterprises

The highly competitive environment for the food industry after the accession of Bulgaria to the European Union puts companies under conditions where the focus is on the quality and products safety. Both the competitiveness theory and the topic of food safety have been widely discussed in recent years, and research in this area is growing, but there is a lack of in-depth information in the Bulgarian literature on the relationship between competitiveness ↔ food safety systems and the open question of how strategies food safety would increase corporate competitiveness. Examining this relationship, it is possible to uncover those factors stemming from the requirements of food safety systems, the improvement of which can help the food industry companies to increase their competitiveness. The subject of the study is the different approaches and methods of assessment and analysis outlining the opportunities for increasing the competitiveness of enterprises from the food industry through the implementation of food safety systems. The report aims to reveal the interrelationship between competitiveness and food safety systems and the implementation of methodologies to increase their competitiveness. The study and assessment of factors to improve the competitiveness of food business enterprises through the implementation of food safety systems is based primarily on expert judgment as well as on marketing and diagnostic analysis. Emphasis is placed on factors that arise from the requirements of food safety systems and a few extras that are important for the formation of strong competitive advantages.

Septicity in sewers: causes, consequences and containment

1995 ◽  
Vol 31 (7) ◽  
pp. 237-253 ◽  
Author(s):  
Arthur G. Boon
Keyword(s):  
Research And Development ◽  
Hydrogen Sulphide ◽  
Protective Coatings ◽  
Critical Conditions ◽  
Corrosion Resistant ◽  
Adequate Supply ◽  
The Subject

This paper reviews research and development on the causes, consequences and methods of controlling septicity in sewers. It draws on information given in 57 published papers on the subject. Explanations are given on the deviation of equations used to predict critical conditions in sewers and rising mains. The consequences of septicity, including toxicity, corrosion and odour nuisance, are described and discussed. Prevention is always recommended over cure, but where this cannot be achieved the methods of controlling septicity generally rely on maintaining an adequate supply of oxygen (dissolved or chemically available) to oxidize previously formed sulphide. Other options to cure the effects of septicity include minimizing the emission of hydrogen sulphide into the atmosphere, deodorizing vented air, and the use of protective coatings or corrosion-resistant pipes.

On the unification problem for Cartesian closed categories

1997 ◽  
Vol 62 (2) ◽  
pp. 636-647 ◽  
Author(s):  
Paliath Narendran ◽  
Frank Pfenning ◽  
Richard Statman
Keyword(s):  
Programming Languages ◽  
Semantics Of Programming Languages ◽  
Potential Applications ◽  
Polymorphic Type ◽  
Unification Problem ◽  
Cartesian Closed Categories ◽  
The Subject ◽  
Np Complete ◽  
Cartesian Closed ◽  
Open Question

AbstractCartesian closed categories (CCCs) have played and continue to play an important role in the study of the semantics of programming languages. An axiomatization of the isomorphisms which hold in all Cartesian closed categories discovered independently by Soloviev and Bruce, Di Cosmo and Longo leads to seven equalities. We show that the unification problem for this theory is undecidable, thus settling an open question. We also show that an important subcase, namely unification modulo thelinear isomorphisms, is NP-complete. Furthermore, the problem of matching in CCCs is NP-complete when the subject term is irreducible.CCC-matching and unification form the basis for an elegant and practical solution to the problem of retrieving functions from a library indexed by types investigated by Rittri. It also has potential applications to the problem of polymorphic type inference and polymorphic higher-order unification, which in turn is relevant to theorem proving and logic programming.

scholarly journals Difference of learning mathematics between open question model and conventional model

2018 ◽  
Vol 1 (1) ◽  
pp. 13
Author(s):  
Ahmad Afandi
Keyword(s):  
Learning Outcomes ◽  
Learning Model ◽  
Research Subjects ◽  
Open Learning ◽  
Learning Problem ◽  
Learning Mathematics ◽  
Class Viii ◽  
The Subject ◽  
The Difference ◽  
Open Question

Open learning model as well as conventional learning model is a learning model that is able to enable students in acquiring knowledge and learning experiences. The purpose of this research is to know the difference of learning result between students taught by using model of open matter problem and conventional learning model on the subject of wake up space. This research was conducted at SMP Al Badri Arjasa Jember in February 2018. The research subjects were 70 students in two classes namely class VIII - A and class VIII - B. This research uses experimental design that is, one experiment class and one control class. The results obtained in the study are learning outcomes using open-ended learning model and conventional learning model. T-test conducted shows that there are differences. Average learning outcomes of experimental class students after treatment was 69.657 while the control class learning outcome was 56.886. The conclusion that can be drawn from data analysis and discussion result is difference of student learning result by using model of open learning problem with conventional learning model, and model of open learning problem is suitable to be applied to the subject of student room of SMP Al Badri Arjasa Jember.

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