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Systematic Studies on Cucurbitaceae Family at Rajshahi Division, Bangladesh
Issue:
Volume 1, Issue 2, May 2013
Pages:
10-15
Received:
17 May 2013
Published:
10 June 2013
Abstract: Systematic investigation on the family Cucurbitaceae growing throughout the Rajshahi Division situated in the northern parts of Bangladesh was carried out. A total of 24 species under 13 genera of the family Cucurbitaceae were collected and identified. A complete taxonomic account of each species has been given along with their current name, local name, brief description, phenology, basic chromosome number and voucher number. A new system of classification of the family Cucurbitaceae has been proposed on the basis of morphological, cytological and floral characters.
Abstract: Systematic investigation on the family Cucurbitaceae growing throughout the Rajshahi Division situated in the northern parts of Bangladesh was carried out. A total of 24 species under 13 genera of the family Cucurbitaceae were collected and identified. A complete taxonomic account of each species has been given along with their current name, local ...
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The Effects of Variable Light and Lipids on the Water Column Distribution and Interactions of Phytoplankton
Cody Bartlett Smith,
Kalina Marinova Manoylov
Issue:
Volume 1, Issue 2, May 2013
Pages:
16-24
Received:
14 May 2013
Published:
30 June 2013
Abstract: The mechanisms and stimuli that control buoyancy and population numbers in planktonic diatoms are poorly understood. Light, lipids, biovolume, size, and ion regulation have been suggested as possible mechanisms controlling water column distribution. In this study, changes in buoyancy of algae grown as combinations of mono and mixed cultures were measured along with the effects of a varying light direction on the water column distribution of the planktonic diatoms Thalassiosira sp. 1, Thalassiosira pseudonana and Staurosira construens var. venter. Clonal populations were grown in monoculture or in factorial combinations under top and bottom light conditions. No difference in water column distribution or growth between samples exposed to light from above or light from bellow was observed. Oil played an insignificant role in buoyancy regulation. The only species that was buoyant throughout the study was Thalassiosira sp. 1. The larger size and surface area-to-volume ratio of this species indicates a relationship between an increase in buoyancy and increased biovolume. Species specific water column distributions were observed between the monoculture study and the mixed culture study, indicating species specific interactions among phytoplankton may play a significant role in influencing their water column distribution and their degree of buoyancy.
Abstract: The mechanisms and stimuli that control buoyancy and population numbers in planktonic diatoms are poorly understood. Light, lipids, biovolume, size, and ion regulation have been suggested as possible mechanisms controlling water column distribution. In this study, changes in buoyancy of algae grown as combinations of mono and mixed cultures were me...
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Variability in Antinutritional Compounds in Hempseed Meal of Italian and French Varieties
Roberto Russo,
Remo Reggiani
Issue:
Volume 1, Issue 2, May 2013
Pages:
25-29
Received:
23 May 2013
Published:
30 June 2013
Abstract: The use of hempseed flours in the animal diets may be limited by the presence of antinutritive compounds. The content of phytic acid, condensed tannins, trypsin inhibitors, cyanogenic glycosides and saponins was evaluated in hempseed meal of three italian varieties (dioecious) and three french varieties (monoecious) of Cannabis sativa L. The analysis of variance showed significant differences among varieties for all the antinutritional compounds. The italian and french hemp groups resulted significantly different in the content of phytic acid, trypsin inhibitors and cyanogenic glycosides. The concentration of phytic acid in the hempseed flour deserves attention in both groups, while the content of cyanogenic glycosides deserves attention just in the french varieties, and condensed tannins, trypsin inhibitors and saponins are instead to acceptable levels. The french varieties presented less phytic acid than those italians (-0.55 g Kg-1 of dry matter). The content of phytic acid in hemp varieties resulted inversely correlated with trypsin inhibitors and cyanogenic glycosides. Since the presence of phytic acid in meal may lead to mineral deficiencies over a long period of administration, the phytic acid contents in hempseed flour should be reduced to increase the safety of these flours, but avoiding altering trypsin inhi-bitor and cyanogenic glycoside contents.
Abstract: The use of hempseed flours in the animal diets may be limited by the presence of antinutritive compounds. The content of phytic acid, condensed tannins, trypsin inhibitors, cyanogenic glycosides and saponins was evaluated in hempseed meal of three italian varieties (dioecious) and three french varieties (monoecious) of Cannabis sativa L. The analys...
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