ケニヤ産トウモロコシの脂質成分の特性について

The lipid composition of five Kenyan maize varieties was evaluated. The oil contents ranged between 3.9 and 5.0%. Neutral lipids comprised about 90% of the total lipids. Triglycerides were the most abundant lipid class, comprising more than 50% of the total lipids. High levels og free fatty acids were observed, indicating deterioration of the lipids.5種類のケニヤ産トウモロコシの脂質組成を分析した。その結果、全脂質含量は3.5-5.0% であり、中性脂質は全脂質含量の90% を占め、トリグリセリドは全脂質含量の50% を占めた。また、高い遊離脂肪酸含量が観察されたが、これは脂質の分解が起こっていることを示している

ケニヤ産トウモロコシ及び麦芽処理したケニヤとマラウイ産穀物のアフラトキシンによる汚染

Total aflatoxin concentrations of up to 1020ppb were found in malted grains from Malawi and Kenya. 29% of the maize flour used as the staple food in the two counries was found to be contaminated.マラウイ及びケニヤ産の麦芽処理された穀物には総量にして1020ppb濃度以上のアフラトキシンが検出された。また、ケニヤ及びマラウイの主食品として用いられているトウモロコシ粉の29% がアフラトキシンで汚染されていることが明らかになった

Digestive Enzymes of the Crustaceans Munida and Their Application in Cheese Manufacturing: A Review

Crustaceans Munida (fam. Galatheideae, ord. Decapodi) were fished in the Southern Adriatic Sea and their proteolytic activities were characterized and tested for potential application in cheese manufacturing. Enzymes extracted from whole crustaceans, mainly serine proteases, showed high caseinolytic and moderate clotting activities. Analysis by 2D zymography of the digestive enzymes extracted from Munida hepatopancreas, showed the presence of several isotrypsin- and isochymotrypsin-like enzymes in the range of 20–34 kDa and 4.1–5.8 pI. Moreover, specific enzymatic assays showed the presence of aminopeptidases and carboxypeptidases A and B. Overall, optimum activity was achieved at pH 7.5 and 40–45 °C. Caseinolytic activity, determined both spectrophotometrically and by SDS gel electrophoresis, indicated higher activity on β-casein than on α-casein. Miniature cheddar-type cheeses and Pecorino-type cheeses were manufactured by adding starter, rennet and Munida extracts to milk. Reverse-phase HPLC and MALDI-ToF mass spectrometry showed a more complex pattern of proteolytic products in cheeses made using Munida instead of chymosin. Munida extracts were found to degrade the chymosin-derived β-casein fragment f193–209, one of the peptides associated with bitterness in cheese. In conclusion, Munida digestive enzymes represent a promising tool for development of new cheese products and shorten cheese ripening when used either alone or in addition to calf rennet

THE LANDFORM OF THE NORTHERN PART OF PRINCE HARALD COAST, EAST ANTARCTICA

The bare rock areas along the eastern coast of Lutzow-Holm Bay are topographically classified into (1) strandflat, (2) hilly lands, (3) mountains, and (4) recessional moraines, which had been described as divisible into two: hilly lands and mountains (YOSHIKAWA and TOYA, 1957), or flat surface and mountains including hilly lands (TATSUMI and KIKUCHI, 1959a). (1) The marginal belt of Langhovde and Skarvsnes areas, the Ongul Islands and many other coastal islets, formerly described as flat surface are as a whole regarded as strandflat. It rarely attains to 50 metres and in most cases to less than 30 metres in height above sea level. Judging from its topographical characteristics it is considered to be a glaciated piedmont plain (Plate 1). (2) The hilly lands attaining to 50-300 metres in height and showing as a whole an accordance of summit level are regarded as roches moutonnees of a rather large scale, among which there are many cirque-like hollows, small-scale U-shaped valleys and steep-sided inlets formed by the differential erosion of ice sheet or by the erosion of ice falls and or ice streams (Plates 1 and 2). (3) The mountains, 300-500 metres high above sea level, which dominate over the surrounding hilly lands have an appearance of so-called "giant roche moutonnee" or glaciated monadnock (Plate 3). In some places, mountain flanks are almost vertically truncated by the lateral erosion of ice streams as in the northern face of Mt. Langhovde, the southwestern wall of Mt. Skjegget and the southwestern part of Breidvognippa. (4) A series of recessional moraines, 5-30 metres wide and 100-1,000 metres long, occur at a distance of 10-100 metres landward from the inner margins of the actual bare rock areas (Plate 4). At present, these moraines indicate the position of the boundary between the "dead" and the "active" glacier ice. No morainic hillock other than these and no meltwater drainage channel could thus far be found on the bare rock areas. These facts imply that the front of the former ice sheet retreated on the present bare rock areas without any halting to the position above-mentioned, and that the ablation of ice sheet was caused not by melting but mainly by evaporation. It has been known that the ice front began to retreat from the Ongul Islands at least 30,000 years ago (NAGATA and YOSHIDA, 1962). The Ongul Islands have been located in a periglacial morphogenetic area since that time, yet the development of patterned grounds, nivation features and the deposits of cryoturbate are poor and limited. In East Ongul Island, patterned grounds were found at four spots. They are nonsorted nets on the ground moraines in shallow hollows (Plate 6), and monosorted stripes on the raised beaches (Plate 7). They are nothing but mere frost cracks without any marked segregation by frost heaving of the facial coarser materials from the finer materials to be found beneath them. Sorted polygons are found at five localities, three on the veneer of ground moraines at the foot of the plucking side of roches moutonnees in Skallen area, and other two on the recessional moraines underlain by dead ice in Breidvog area. In the latter cases, the sorted polygons are considered to be formed by the differential melting of ice beneath them (Plate 8). As the air temperature is usually low in these areas, opportunities for air temperature of its alternate rise and fall above and below freezing point, and of its abrupt rise above that point are very rare (Fig. 2). Both the duration for the occurrence of the feezethaw cycles of water in soils and rock joints and the snow melting period in a year are very short. Moreover, low humidity, lack of rainfall and strong wind tend to stimulate the evaporation of ground water. Hence the inactive cryoplanation and the poor or indefinite development of microtopographies such as patterned grounds of the bare rock areas under consideration. It was impressive to the present writer to find the facts that the cryoplanation in these areas is inactive compared with that in the Japanese Alps and the Central Highlands of Hokkaido

ショウワ キチ フキン ロガン チイキ ノ チケイ

The bare rock areas along the eastern coast of Lutzow-Holm Bay are topographically classified into (1) strandflat, (2) hilly lands, (3) mountains, and (4) recessional moraines, which had been described as divisible into two: hilly lands and mountains (YOSHIKAWA and TOYA, 1957), or flat surface and mountains including hilly lands (TATSUMI and KIKUCHI, 1959a). (1) The marginal belt of Langhovde and Skarvsnes areas, the Ongul Islands and many other coastal islets, formerly described as flat surface are as a whole regarded as strandflat. It rarely attains to 50 metres and in most cases to less than 30 metres in height above sea level. Judging from its topographical characteristics it is considered to be a glaciated piedmont plain (Plate 1). (2) The hilly lands attaining to 50-300 metres in height and showing as a whole an accordance of summit level are regarded as roches moutonnees of a rather large scale, among which there are many cirque-like hollows, small-scale U-shaped valleys and steep-sided inlets formed by the differential erosion of ice sheet or by the erosion of ice falls and or ice streams (Plates 1 and 2). (3) The mountains, 300-500 metres high above sea level, which dominate over the surrounding hilly lands have an appearance of so-called "giant roche moutonnee" or glaciated monadnock (Plate 3). In some places, mountain flanks are almost vertically truncated by the lateral erosion of ice streams as in the northern face of Mt. Langhovde, the southwestern wall of Mt. Skjegget and the southwestern part of Breidvognippa. (4) A series of recessional moraines, 5-30 metres wide and 100-1,000 metres long, occur at a distance of 10-100 metres landward from the inner margins of the actual bare rock areas (Plate 4). At present, these moraines indicate the position of the boundary between the "dead" and the "active" glacier ice. No morainic hillock other than these and no meltwater drainage channel could thus far be found on the bare rock areas. These facts imply that the front of the former ice sheet retreated on the present bare rock areas without any halting to the position above-mentioned, and that the ablation of ice sheet was caused not by melting but mainly by evaporation. It has been known that the ice front began to retreat from the Ongul Islands at least 30,000 years ago (NAGATA and YOSHIDA, 1962). The Ongul Islands have been located in a periglacial morphogenetic area since that time, yet the development of patterned grounds, nivation features and the deposits of cryoturbate are poor and limited. In East Ongul Island, patterned grounds were found at four spots. They are nonsorted nets on the ground moraines in shallow hollows (Plate 6), and monosorted stripes on the raised beaches (Plate 7). They are nothing but mere frost cracks without any marked segregation by frost heaving of the facial coarser materials from the finer materials to be found beneath them. Sorted polygons are found at five localities, three on the veneer of ground moraines at the foot of the plucking side of roches moutonnees in Skallen area, and other two on the recessional moraines underlain by dead ice in Breidvog area. In the latter cases, the sorted polygons are considered to be formed by the differential melting of ice beneath them (Plate 8). As the air temperature is usually low in these areas, opportunities for air temperature of its alternate rise and fall above and below freezing point, and of its abrupt rise above that point are very rare (Fig. 2). Both the duration for the occurrence of the feezethaw cycles of water in soils and rock joints and the snow melting period in a year are very short. Moreover, low humidity, lack of rainfall and strong wind tend to stimulate the evaporation of ground water. Hence the inactive cryoplanation and the poor or indefinite development of microtopographies such as patterned grounds of the bare rock areas under consideration. It was impressive to the present writer to find the facts that the cryoplanation in these areas is inactive compared with that in the Japanese Alps and the Central Highlands of Hokkaido

Landslides and relict ice margin landforms in Adventdalen, central Spitsbergen, Svalbard

Two characteristic landforms, landslide blocks and drainage channels, were investigated in Adventdalen, central Spitsbergen. The landslides in the middle reaches of Adventdalen comprise large-scale bedrock slumps which form a hummocky surface on the south slope of Arctowskifjellet. The fourteen recognized landslide blocks are divided into upper and lower sections, according to altitude. The drainage channels consist of tributary rivers to Adventelva which flow in two distinct directions, either parallel with or oblique to the direction of the main river. Glacial deposits were found to cover the ridges between these tributary channels. The upper and lower landslide divisions may indicate former positions of the ice surface, and the channels appear to have originated during the existence of lateral moraine ridges with high ice content. These geomorphological findings have allowed reconstruction of former ice marginal positions, and they strongly suggest the existence of stagnant ice or minor re-advance phases during the course of deglaciation in Adventdalen