Computed tomographic and radiographic morphometric study of cardiac and coelomic dimensions in captive blue-fronted Amazon parrots (Amazona aestiva,Linnaeus, 1758) with varying body condition scores     

Gisele J. dos Santos  Jeana P. da Silva  Alícia G. Hippólito  Bárbara S. Ferro  Elton Luís R. Oliveira  Priscylla Tatiana C. G. Okamoto  Maria Lucia G. Lourenço  Vania Maria de Vasconcelos Machado  Sheila C. Rahal  Carlos R. Teixeira  Alessandra Melchert 《Anatomia, histologia, embryologia》2020,49(2):299-306

This study aimed to assess radiographic and tomographic cardiac parameters, including width and length of the heart, and the ratio of heart width to coelom width of blue-fronted Amazon parrots (Amazona aestiva) with varying body condition scores. Thirty-five captive birds were included in the study and were allocated into one of three groups according to their respective body condition score: lean, ideal and obese. No differences were observed among the groups with regard to radiographic and tomographic measurements. Computed tomography enabled better identification of the structures of the cardiovascular system without interference from the overlying structures of the celomatic cavity observed in radiographic images. However, radiographic examinations should still be considered the standard screening method to identify cardiac alterations, such as increased or reduced organ dimensions. Standardizing the techniques and measurements performed in this study may serve as a basis for further research in the field.  相似文献   

Growth responses of cereal crops to organic nitrogen in the field     

Miwa Okamoto  Toshihiro Watanabe  Noriharu Ae 《Soil Science and Plant Nutrition》2013,59(3):445-452

Eleven rice varieties differing in grain size were grown under controlled environmental conditions during the grain-filling period. The grain weight of upper grains in a panicle was examined at successive stages of growth during the grain-filling period. The effect of temperature on the rate and the duration of the period of grain-filling was determined using Khao Lo, a large-grain variety, and Bom Dia, a small-grain variety. Both the grain-filling rate and duration of the period of grain-filling differed among rice varieties and were positively and significantly correlated with the grain size. The duration of the grain-filling period from flowering to the time when almost maximum grain weight was attained ranged from 12 days at 32/24°C in Bom Dia to 36 days at 20/12°C in Khao Lo. The grain-filling rate was low in small-grain varieties, and generally increased with increasing grain size.

By lowering the temperature, the grain-filling rate decreased, the duration of the grain-filling period increased but the grain weight was almost constant.

Weight per grain was closely correlated with hull size. No relationship was found between weight per grain and nitrogen percentage of brown rice.  相似文献   

Effects of land-use type and nitrogen addition on nitrous oxide and carbon dioxide production potentials in Japanese Andosols     

YuHua Kong  Mirai Watanabe  Hirohiko Nagano  Keiji Watanabe  Miwa Yashima 《Soil Science and Plant Nutrition》2013,59(5):790-799

Land-use type and nitrogen (N) addition strongly affect nitrous oxide (N₂O) and carbon dioxide (CO₂) production, but the impacts of their interaction and the controlling factors remain unclear. The aim of this study was to evaluate the effect of both factors simultaneously on N₂O and CO₂ production and associated soil chemical and biological properties. Surface soils (0–10 cm) from three adjacent lands (apple orchard, grassland and deciduous forest) in central Japan were selected and incubated aerobically for 12 weeks with addition of 0, 30 or 150 kg N ha^–1 yr^–1. Land-use type had a significant (p < 0.001) impact on the cumulative N₂O and CO₂ production. Soils from the apple orchard had higher N₂O and CO₂ production potentials than those from the grassland and forest soils. Soil net N mineralization rate had a positive correlation with both soil N₂O and CO₂ production rates. Furthermore, the N₂O production rate was positively correlated with the CO₂ production rate. In the soils with no N addition, the dominant soil properties influencing N₂O production were found to be the ammonium-N content and the ratio of soil microbial biomass carbon to nitrogen (MBC/MBN), while those for CO₂ production were the content of nitrate-N and soluble organic carbon. N₂O production increased with the increase in added N doses for the three land-use types and depended on the status of the initial soil available N. The effect of N addition on CO₂ production varied with land use type; with the increase of N addition doses, it decreased for the apple orchard and forest soils but increased for the grassland soils. This difference might be due to the differences in microbial flora as indicated by the MBC/MBN ratio. Soil N mineralization was the major process controlling N₂O and CO₂ production in the examined soils under aerobic incubation conditions.  相似文献   

Investigations on Cambodian soils     

Hideaki Saeki  Masao Okamoto  Junzo Azuma  Hirofumi Inoue  Masahiro Takiuchi  Hiroshi Tarumi 《Soil Science and Plant Nutrition》2013,59(1):16-22

Basic information on the nature of soils, their potentialities, and their limitations is necessary to evaluate Cambodian agriculture properly, and to develop a program for increasing food and other crops. Suitable information has, however, been limited, especially as there is not to be found in any report much data relating to soils of different origins over the whole country. There is, needless to say, some information on confined areas of Cambodia.  相似文献   

Effects of potassium nutrition on the glycolysis and the krebs cycle in taro plants     

Saburo Okamoto 《Soil Science and Plant Nutrition》2013,59(5):143-150

The previous works (1, 2) with the bleeding sap from taro plants showed that a potassium deficiency altered the amplitude and the period of the diurnal periodicity in exudation process with the roots, and suggested that potassium might be an essential element for an intensive exchange of amino acids between living xylem tissues and xylem sap. The other works (3,4) with excised roots from sweet potato plants grown in a seven days solution culture showed that the relatively K-deficient roots had higher respiratory activities than the normal, especially In the root tip, and accumulated concomitantly higher levels of reducing sugars and amino nitrogen. Recently, however, an increasing number of works (5, 6) has been devoted exclusively to elucidating the relationship between respiratory activity in plant tissues and organic acid metabolism under a relative K-deficiency. In this work the effects of potassium nutrition on the glycolysis and the Krebs cycle in the roots and the leaves of taro plants are investigated in an attempt to compare these effects in a longer term culture of taro plants with those in a seven days culture of sweet potato plants.  相似文献   

Development of a new high-throughput and small-size method for measuring sediment oxygen demand in lakes     

Shimotori  Koichi  Yamamoto  Haruki  Imai  Akio  Kohzu  Ayato  Okamoto  Takahiro 《Journal of Soils and Sediments》2021,21(2):1222-1231

Journal of Soils and Sediments - Sediment oxygen demand (SOD) measurement currently requires a long preparation time and bulky experimental equipment, which represent major obstacles to conducting...  相似文献   

奶牛饲喂不同精粗料比TMR对排泄粪尿和氮磷的影响     

孙德成  赵智力  魏曼琳  包丽华  冈本全弘 《家畜生态学报》2011,32(4):85-88

将18头荷斯坦产奶牛随机分为试验6组,每组3头,试验Ⅰ～Ⅵ组奶牛依次饲喂不同精粗料比(精料:粗料)的TMR1 (20∶80)、TMR2(30∶70)、TMR3 (40∶60)、TMR4 (50∶50)、TMR5 (60∶40)、TMR6 (70∶30)的日粮,探讨不同精粗料比TMR对奶牛粪尿、N、P的排泄量和CH4释放...  相似文献   

Isolation and cultivation of canine transmissible sarcoma cells   总被引：1，自引：0，他引：1  

Y Okamoto  T Fujinaga  M Tajima  N Hoshi  K Otomo  T Koike 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1988,50(1):9-13

  相似文献   

Implantation of canine transmissible sarcoma cells to X-ray irradiated and nude mice     

Y Okamoto  T Fujinaga  M Tajima  K Otomo  T Koike 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1988,50(1):283-285

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Serum total amylase activity and its isoenzyme fractions in newborn pigs with relation to growth and iron dextran-treatment.     

M Akuzawa  M Morizono  K Sudo  N Yasuda  K Okamoto  E Deguchi 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》1992,54(6):1151-1155

Serum amylase activity was analyzed chromogenically (blue starch method) and its isoenzyme was separated by cellulose acetate membrane electrophoresis in newborn pigs comparing with those in adult pigs. Serum amylase activity in newborn pigs was about one half of adults' and increased with age. Serum amylase isoenzymes were separated into 4 fractions from the cathode. The isoenzymes were also classified in 5 types on the basis of the combination of these 4 fractions. Incidences of the fractions and the types were not significantly different between adults and newborns. After the iron dextran treatment, serum amylase activity as well as levels of erythrocytes, hemoglobin and packed cell volume increased. The rates of increase in hemoglobin and packed cell volume were more significant in the double treatment group than in the single treatment group, while serum amylase activity increased similarly in these 2 groups. The increase in serum amylase activity seemed to indicate that the development of amylase-producing organs was reinforced by the iron compound treatment. It is thought that serum amylase activity may be an indicator of healthy growth in newborn pigs.  相似文献