Determination of the optimal temperature range for synthesis of B4C–TiB2 and B4C–ZrB2 powder composite materials

2020 ◽  
Vol 31 ◽  
pp. 506-508
Author(s):  
V.A. Shestakov ◽  
T.S. Gudyma ◽  
Yu.L. Krutskii ◽  
N.F. Uvarov
2020 ◽  
pp. 85-87
Author(s):  
TATIANA YURIEVNA ERANSKAYA ◽  

The effect of pre-firing of kaolin concentrates on the yield of aluminum hydroxide during nitric acid leaching by cavitation method is studied. The firing interval of 700-750 ° C is optimal for maximum opening of kaolin concentrate.


Author(s):  
Chad L. Widmer

The effects of ten different water temperatures on the growth of newly released ephyrae of Aurelia labiata were explored. Ephyrae grown at 21°C showed the greatest growth, increasing in bell diameter from about 4.0 mm to 14.5 mm in 14 days and remained in good condition for the duration of the experiment. Ephyrae subjected to other temperatures grew at different rates. Ephyrae maintained at 8°C gradually decreased in size during the experiment, shrinking in bell diameter from about 4.0 mm to 3.8 mm by day 14, but remained in apparent good condition. Ephyrae reared at 22.5°C and above everted their bells, were in poor condition, and were unable to feed or swim effectively by about day ten. In this study the optimal temperature range for rearing A. labiata ephyrae was 12°C—21°C, which corresponds with the reported range for this species.


2020 ◽  
Author(s):  
Mao Suganami ◽  
Yuji Suzuki ◽  
Youshi Tazoe ◽  
Wataru Yamori ◽  
Amane Makino

Abstract Rubisco limits C3 photosynthesis under some conditions and is therefore a potential target for improving photosynthetic efficiency. The overproduction of Rubisco is often accompanied by a decline in Rubisco activation, and the protein ratio of Rubisco activase (RCA) to Rubisco (RCA/Rubisco) greatly decreases in Rubisco-overproducing plants (RBCS-ox). Here, we produced transgenic rice (Oryza sativa) plants co-overproducing both Rubisco and RCA (RBCS-RCA-ox). Rubisco content in RBCS-RCA-ox plants increased by 23%–44%, and RCA/Rubisco levels were similar or higher than those of wild-type plants. However, although the activation state of Rubisco in RBCS-RCA-ox plants was enhanced, the rates of CO2 assimilation at 25°C in RBCS-RCA-ox plants did not differ from that of wild-type plants. Alternatively, at a moderately high temperature (optimal range of 32°C–36°C), the rates of CO2 assimilation in RBCS-ox and RBCS-RCA-ox plants were higher than in wild-type plants under conditions equal to or lower than current atmospheric CO2 levels. The activation state of Rubisco in RBCS-RCA-ox remained higher than that of RBCS-ox plants, and activated Rubisco content in RCA overproducing, RBCS-ox, RBCS-RCA-ox, and wild-type plants was highly correlated with the initial slope of CO2 assimilation against intercellular CO2 pressures (A:Ci) at 36°C. Thus, a simultaneous increase in Rubisco and RCA contents leads to enhanced photosynthesis within the optimal temperature range.


2007 ◽  
Vol 8 (1) ◽  
pp. 75
Author(s):  
Hugo Humberto Ballesteros ◽  
Rodrigo Efrén Vásquez

<p>Se valoró la producción de jalea real en un apiario localizado en un ecosistema de trópico alto. A tal fin, se evaluaron cuatro tratamientos representados en colmenas de recría de diez, ocho y seis cuadros, cada uno con tres repeticiones; se estimó el porcentaje de aceptación y la cantidad de jalea real por cúpula. En las colmenas de recría de seis cuadros la temperatura interna fue más constante que en los demás tratamientos (mínima 30°C y máxima 38°C); así mismo, presentó un rango de temperatura óptima entre 34 y 35°C, factor de gran importancia ya que este tipo de colmena de recría produjo la mayor cantidad de jalea real por transferencia (15.973 mg) con una aceptación de cúpulas del 86,3% y una producción promedio por cúpula aceptada de 308,5 mg. Las colmenas de recría de ocho cuadros presentaron una temperatura mínima de 26°C y una máxima de 36°C, con una producción de 7.976 mg por transferencia, una aceptación del 72% y una producción promedio por cúpula aceptada de 185,3 mg. Las colmenas de recría de diez cuadros presentaron una temperatura mínima de 22°C y una máxima de 34°C, una producción de 6.364 mg por transferencia, una aceptación del 51% y una producción promedio por cúpula aceptada de 208 mg.</p><p> </p><p><strong>Determination of royal jelly production in rearing hives of different dimensions</strong></p><p>The production of royal jelly in an apiary located in a high tropical ecosystem was evaluated. To that end, four treatments were evaluated represented in rearing hives of ten, eight and six compartments, each with three repetitions; the percentage of filled cupules and the quantity of royal jelly per cupule for each group was determined. In the rearing hives with six compartments the internal temperature was more constant than in the other treatments (minimum 30°C and maximum 38°C); it also showed an optimal temperature range of 34-35ºC, a factor of great importance since this kind of rearing hive produced the largest amount of royal jelly per transfer (15,973 mg) with 86.3% of filled cupules and an average production of 308.5 mg per filled cupule. The rearing hives with eight compartments showed a minimum temperature of 26°C and maximum of 36°C, with a production of 7,976 mg per transfer, 72% filled cupules and an average production of 185.3 mg per filled cupule. The rearing hives of ten compartments showed a minimum temperature of 22°C and a maximum of 34°C, with a production of 6,364 mg per transfer, 51% filled cupules and an average production of 208 mg per filled cupule.</p>


2021 ◽  
Vol 57 (5) ◽  
pp. 481-486
Author(s):  
V. A. Shestakov ◽  
T. S. Gudyma ◽  
Yu. L. Krutskii ◽  
N. F. Uvarov ◽  
A. E. Brester ◽  
...  

2013 ◽  
Vol 1 (39) ◽  
pp. 6316 ◽  
Author(s):  
Richard F. D'Vries ◽  
Susana Álvarez-García ◽  
Natalia Snejko ◽  
Luisa E. Bausá ◽  
Enrique Gutiérrez-Puebla ◽  
...  

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