Browsing by Issue Date, starting with "1938"

Now showing 1 - 17 of 17

The oedogoniales of the United Provinces, India-I
(1938) Rama Nagina Singh
[No abstract available]
STUDIES IN POTATO STORAGE: II. INFLUENCE OF (1) THE STAGE OF MATURITY OF THE TPBERS AND (2) THE STORAGE TEMPERATURE FOR A BRIEF DURATION IMMEDIATELY AFTER DIGGING, ON PHYSIOLOGICAL LOSSES IN WEIGHT OF POTATOES DURING STORAGE
(1938) B.N. SINGH; P.B. MATHUR
Tubers stored for 10–12 days at 18°C. lost considerably less weight during subsequent storage than those pre‐stored at 7°C. previous to permanent storage. This emphasizes the importance of pre‐storing potatoes for a brief duration at a higher temperature preparatory to permanent cold storage. In the adolescent tubers the loss in weight during storage is high and decreases with increasing maturity of the tubers, the value for the total loss being about the same in mature and ripe tubers. Although the magnitude of shrinkage during storage of mature and ripe potatoes is practically the same, the former are superior to the latter in that they keep longer in storage without sprouting. During storage the loss in weight of potatoes due to respiration is very small in comparison with that caused by evaporation of water. Copyright © 1938, Wiley Blackwell. All rights reserved
The nature of the ovular stalk in polygonaceae and some related families
(Oxford University Press, 1938) A.C. Joshi
[No abstract available]
Über die Verschiebung der Absorptionsgrenze während der Flockung von Mangandioxydsolen mit Quecksilbersulfatlösung
(Springer-Verlag, 1938) Ashatakala Purushotham
[No abstract available]
An interspecific hibiscus hybrid: Between h. ficulneus and h. esculentus
(Oxford University Press, 1938) B.N. Singh; S.C. Chakravarti; G.P. Kapoor
[No abstract available]
The effect of chlorine in relation to age upon the growth and composition of wheat
(1938) B.N. Singh; S. Prasad
The application of chlorine from the very beginning of the life-cycle of wheat, brings about a slight depression in dry matter production and an increase in moisture content during their early stages of growth. With advance in age, however, the dry matter accumulation is markedly increased without any appreciable increase in water content. Plants supplied with chlorine twenty days after germination have the maximum dry matter yield. Relative growth rate as well as net assimilation rate are also accelerated. The treated plants do not show any marked effect on their shoot length although the assimilatory surface is increased beyond the control. The roots, on the other hand, in spite of a diminution in length, exhibit a greater lateral ramification and dry matter production. Chlorine-treated plants have a larger percentage ear formation maximum values being obtained in case where this element is supplied twenty days after germination. The accumulation of carbohydrates as also the diastatic activity are greater in the treated plants as compared to the control ones. Growth of plants at successive stages of the life-cycle appears to be determined by both the age and the factor for chlorine a change in either bringing about a variation in dry matter production. The greatest physiological need and hence the maximum augmentative efficiency of this element is found at the period (twenty days after germination in the present case) when plants are showing active growth and differentiation. © 1938 Indian Academy of Sciences.
Errata
(1938) G.W. Chiplonker
[No abstract available]
Rhynchonellids from the Bagh Beds
(1938) G.W. Chiplonker
[No abstract available]
Vascular supply of the pedicel and the ovule in species of Dilleniaceæ [10]
(1938) Kailash Chandra Misra
[No abstract available]
Fertility value of cultivated land as influenced by crop-residue and season
(1938) B.N. Singh; S.N. Singh; P.P. Gupta
[No abstract available]
A new method for the detection of carotenoids in chlorophyll samples
(Springer-Verlag, 1938) B.N. Singh; N.K. Anantha Rao
A new method is developed for the detection of carotenoids in chlorophyll samples. The typical colour curve of chlorophyll in 80 % methyl alcohol exhibits marked absorption in 690 μμ to 610 μμ and less absorption in 500 μμ to 430 μμ. The colour curve of chlorophyll contaminated with carotenoids exhibits higher values in the region 530 μμ to 430 μμ. If carotin is present, the band maximum in the region 530 μμ to 430 μμ is located at 500 μμ, and if xanthophyll is the impurity the band maximum is shifted to 430 μμ. On a comparison of the colour curve of the sample to be tested with that of the typical colour curve of chlorophyll the presence of carotenoids at once becomes evident, and carotin and xanthophyll are identified separately by the positions of the band maxima in the region 500 μμ to 430 μμ. Carotenoids in as low a concentration as 0.05 % are detected by the new method described. © 1938 Verlag Von Gebrüder Borntraeger.
STUDIES IN POTATO STORAGE: III. RESPIRATION OF POTATO TUBERS DURING STORAGE
(1938) B.N. SINGH; P.B. MATHUR
Adolescent, mature and ripe potatoes continue to be distinguished by their respiratory behaviour throughout the period of storage. When potatoes are placed in storage there is a progressive increase in the concentration of internal carbon dioxide until the termination of the period of dormancy, the percentage of this gas falling rapidly with the commencement of sprouting. Data concerning the composition of the atmosphere surrounding the tubers show that, in general, there is an accumulation of carbon dioxide in the surrounding air with increasing periods in storage. There is a negative correlation between R.Q. and the percentage internal carbon dioxide during the stages of dormancy and sprouting. Records concerning the composition of samples of air withdrawn from top, middle and bottom layers of potatoes show a slightly higher percentage of carbon dioxide in the bottom layer than in the middle and top ones. Data concerning the permeability of the periderm of the potato to gas during storage indicate that the permeability of the superficial tissues decreases considerably during the dormancy of tubers. Copyright © 1938, Wiley Blackwell. All rights reserved
A new boundary condition and the geodesic postulate [2]
(1938) V.V. Narlikar
[No abstract available]
The light factor in crop production
(1938) B.N. Singh; G.P. Kapoor; R.S. Choudhri
[No abstract available]
Relativistic motion of a radiating mass [5]
(1938) V.V. Narlikar
[No abstract available]
Effect of longitudinal magnetic field on the refractive index and conductivity of ionized air [3]
(1938) S.S. Banerjee; B.N. Singh
[No abstract available]
Photosynthetic specificity in relation to biochemic constitution of leaves
(1938) B.N. Singh; K.N. Lal; K. Prasad
An attempt has been made in this paper to study the photosynthetic activity of a number of plant species under optimum yet identical conditions of factor-intensity and to trace the relationship, if any, between the organic materials subsequently formed and the assimilatory influx of carbon dioxide. Different plant species have different photosynthetic rates, the range of variation from species to species becoming more and more pronounced with advance in age of plants. Such variations under otherwise constant external conditions are discussed with special reference to internal factors. The water-content of the experimental material no doubt differs from plant to plant but does not follow the same gradation as that maintained by assimilation rate. The chlorophyll content too shows no correlation with the assimilatory efficiency. There seems to be a fair degree of correlation between the products economised in leaves during their photosynthetic activity and the products stored by the same species towards the close of the life-cycle. Plants economising sugars, proteins, starches and fats in assimilating leaves also store such substances respectively in their storage organs towards the close of their life-cycle. The photosynthetic rate seems to be related to the nature of the end products accumulating in assimilating leaves. Leaves accumulating simpler sugars have fairly high rates of assimilation while those economising the more complex starches, proteins and fats respectively have to their credit decreasing assimilatory efficiency. The biochemic constitution of the experimental material as judged by the products economised during assimilation appears to be an important internal factor governing photosynthesis and suggestively explains the phenomenon of photosynthetic specificity in certain groups of crop plants. © 1938 Indian Academy of Sciences.