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排序方式: 共有242条查询结果,搜索用时 15 毫秒
1.
Kazutaka Kanai Mariko Hino Yasutomo Hori Ruriko Nakao Fumio Hoshi Naoyuki Itoh Seiichi Higuchi 《Journal of veterinary science (Suw?n-si, Korea)》2008,9(4):421-423
The purpose of this study was to determine if salivary chromogranin a secretion in dogs exhibits a circadian rhythm. Saliva sampling was performed during three different sessions occurring in three nonconsecutive 24-h periods. Sixteen healthy adult beagle dogs (8 males and 8 females) were moved to a sampling room and housed individually in cages. Saliva samples were obtained every 4 h from 12:00 p.m. to 12:00 p.m. the following day. In the interest of habituation, saliva was obtained hourly from each dog 3 h before the experiment was started. Salivary chromogranin A concentrations were measured using an enzyme-linked immunosorbent assay. No circadian rhythm was detected for salivary chromogranin A secretion, and no differences in salivary chromogranin A concentrations measured every 4 h were demonstrated during the 24-h cycle in dogs. 相似文献
2.
Ninomiya H Inomata T Kanemaki N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(9):887-892
The microvasculature of the eyes of 5 rabbits was investigated using scanning electron microscopy on corrosion casts. The study revealed that the pars plana vessels draining blood from the iris and ciliary body coursed directly into the anterior vortex venous system constituting the scleral venous plexus (the venous circle of Hovius). The episcleral vasculature was found to possess a specialized morphology, with channels draining the aqueous humor. The capillaries of the third palpebral, bulbar and palpebral conjunctiva formed a single-layered capillary network approximately parallel to the epithelium and formed a well-developed venous plexus in the stroma. The retina was found to be merangiotic, meaning that vessels were present only in a small part of the retina, extending in a horizontal direction to form bands on either side of the optic disc. Channels representing the aqueous veins that drained blood mixed with aqueous humor were found to derive directly from the suprachoroidal space and communicate with the scleral venous plexus via the anterior vortex veins. The functional significance of the microvasculature of the iris, cilia, retina and choroid is discussed in this report as well. The elaborate microvasculature of the conjunctiva may be a prerequisite for the exchange of nutrients and gasses between the cornea and the vessels across the conjunctival epithelium when the eyelids are shut during sleep, and possibly for the dynamics of eye drop delivery. The scleral venous plexus in rabbits may be analogous to the scleral venous sinus (Schlemm's canal) in rats, primates and humans. 相似文献
3.
Burkholderia plantarii , the pathogen of bacterial seedling blight of rice, was detected in paddy water. Its concentration rose in July and August.
The bacterial concentration in the paddy water was always higher along levees than at distances more than 5 m from levees.
Confirmed to be released into water when graminaceous weeds were immersed, B. plantarii survived for at least 4 days at 30°C. B. plantarii was splashed at least 30 cm upward by rain splash in the field. Harvested seeds, which had been sprayed with B. plantarii released from graminaceous weeds at the flowering stage, retained the bacteria. Bacterial seedling blight occurred when the
seeds were then sown in nursery boxes. These results indicated that graminaceous weeds growing on levees of paddy fields are
a source of infection of the disease and that rice seeds are infected through the paddy water.
Received 23 May 2002/ Accepted in revised form 1 September 2002 相似文献
4.
Chie SUZUKI Yosuke SAKAGUCHI Hiroyoshi HOSHI Koji YOSHIOKA 《The Journal of reproduction and development》2016,62(1):79-86
The effects of lipid-rich bovine serum albumin (LR-BSA) on the development of porcine blastocysts produced
in vitro were examined. Addition of 0.5 to 5 mg/ml LR-BSA to porcine blastocyst medium
(PBM) from Day 5 (Day 0 = in vitro fertilization) significantly increased the hatching rates
of blastocysts on Day 7 and the total cell numbers in Day-7 blastocysts. When Day-5 blastocysts were cultured
with PBM alone, PBM containing LR-BSA, recombinant human serum albumin or fatty acid-free BSA, addition of
LR-BSA significantly enhanced hatching rates and the cell number in blastocysts that survived compared with
other treatments. The diameter, ATP content and numbers of both inner cell mass and total cells in Day-6 and
Day-7 blastocysts cultured with PBM containing LR-BSA were significantly higher than in blastocysts cultured
with PBM alone, whereas LR-BSA had no effect on mitochondrial membrane potential. The mRNA levels of enzymes
involved in fatty acid metabolism and β-oxidation (ACSL1, ACSL3,
CPT1, CPT2 and KAT) in Day-7 blastocysts were
significantly upregulated by the addition of LR-BSA. The results indicated that LR-BSA enhanced hatching
ability and quality of porcine blastocysts produced in vitro, as determined by ATP content,
blastocyst diameter and expression levels of the specific genes, suggesting that the stimulatory effects of
LR-BSA arise from lipids bound to albumin. 相似文献
5.
A split-root apparatus for examining the effects of hydraulic lift by trees on the water status of neighbouring crops 总被引:1,自引:0,他引:1
We describe a split-root system for examining the effects of hydraulic lift by trees on crop growth. In this system, upper
lateral tree roots were grown in a container set on the ground through which the taproot of the tree could penetrate into
the moist soil below. The container, with a radius of 0.5 m and a height of 0.20 m, consisted of two compartments divided
by a waterproof barrier. A markhamia tree (Markhamia lutea (Benth.) Schumann) and upland rice (Oryza sativa (L.)) plants were planted in one compartment, with only rice plants planted in the other compartment. Irrigation of the container
was ceased at the start of the experiment. The stomatal conductance of the rice plants in the associated side, in which both
trees and rice plants were grown, declined more rapidly during the first drying period than in the rice-only compartment,
suggesting that there was competition for water between the tree and the crop plants. However, during the later drying period,
the rice plants in the associated side were green and viable, while those in the rice-only side became desiccated. Rice roots
were seen intermingling with tree roots, and the soil water content in the associated site tended to be higher than in the
rice-only side. It is likely that hydraulic lift occurred in the associated side and that water that had been transferred
to the surface roots was released into the soil, enabling the rice plants in this compartment to remain viable. This novel
system is useful for examination of the effects of hydraulic lift by trees on the growth of neighbouring crops.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
6.
Summary To elucidate biochemical features leading to p-hydroxyphenyl-rich lignin in gymnosperm reaction wood the activities of the following five enzymes involved in the biosynthesis of p-hydroxyphenyl lignin were compared in reaction and opposite woods: phenylalanine ammonialyase (EC 4.3.1.5), cinnamate 4-hydroxylase (EC 1.14.13.11), p-hydroxycinnamate: CoA ligase (EC 6.2.1.12), cinnamyl alcohol dehydrogenase (EC 1.1.1.-) and peroxidase (EC 1.11.1.7). The enzyme activities in the reaction woods of Thuja orientalis and Metasequoia glyptostroboides were remarkably higher than those in the opposite woods, reflecting the higher contents of p-hydroxyphenyl lignin in reaction wood.This work was partly supported by the Grant-in-Aid for Scientific Research (548047) from the Ministry of Education, Science and Culture of Japan. We thank the Ministry of Education for the support 相似文献
7.
Naruyuki?Kamo Hiroyuki?Okamura Mitsuo?Higuchi Mitsuhiro?MoritaEmail author 《Journal of Wood Science》2004,50(3):236-241
Propylene carbonate (PC) is known as one of the cure accelerators for alkaline phenol–formaldehyde resins. To elucidate the cure-acceleration mechanisms, the effects of PC on the condensation reactions of monomeric hydroxymethylphenols (HMPs) were investigated and compared with those of PC hydrolysate, sodium bicarbonate (NaHCO3) and ethyl formate. Immediately after the reaction started, PC, decomposing itself simultaneously, accelerated the formation of the ortho-para methylene-bonded dimer of 2,4,6-trihydroxymethylphenol. This effect of PC was very similar to that of ethyl formate. To the contrary, PC hydrolysate accelerated the formation of the para-para methylene-bonded dimer throughout the course of the reaction. This effect of PC hydrolysate was identical to that of NaHCO3. These results indicate that PC increases the reactivity of the ortho-hydroxymethyl group, presumably through transesterification. On the other hand, NaHCO3 is formed by the hydrolysis of PC or decomposition of the transesterified HMPs and it increases the reactivity of the para-hydroxymethyl group. 相似文献
8.
Naruyuki Kamo Mitsuo Higuchi Takehiro Yoshimatsu Yukiko Ohara Mitsuhiro Morita 《Journal of Wood Science》2002,48(6):491-496
This study reexamined the kinetics of the condensation reactions of hydroxymethylphenols with the purpose of elucidating the reaction mechanisms. This report discusses experimental results on the self-condensations of 2,4-dihydroxymethylphenols (2,4-DHMP) and 2,4,6-trihydroxymethylphenol (THMP), focusing on the order of reaction. The relations between the initial rates of reaction and the initial concentrations of reactants were investigated. Results quite different from those of previous reports were obtained. The order of reaction of the selfcondensation of 2,4-DHMP was found to be 1.1, which did not change with the alkali/2,4-DHMP molar ratio. The order of reaction of the self-condensation of THMP was found to vary with both the concentration of THMP and the alkali/THMP molar ratio. In the region of THMP concentrations above 1.5mol/l, the order of reaction was confirmed to be 2.0, which did not change with the alkali/THMP molar ratio. In the region of THMP concentrations below 1.0mol/l, the order of reaction varied with the alkali/THMP molar ratio, showing fractional numbers of 1.2–1.6. These results indicate that unimolecular reaction(s) and bimolecular reaction(s) take place simultaneously as the ratedetermining step in the condensation reactions of 2,4-DHMP and THMP and that the reaction mechanism changes with the species of reactant and, in some cases, with the reaction conditions.Part of this study was presented at the Wood Adhesives 2000 symposium, South Lake Tahoe, Nevada, USA, June 2000 相似文献
9.
10.
Quantities and types of ceramides and their relationships to physical properties of the horn covering the claws of clinically normal cows and cows with subclinical laminitis 下载免费PDF全文
H. Higuchi M. Nakamura A. Kuwano M. Kasamatsu H. Nagahata 《Canadian journal of veterinary research》2005,69(2):155-158
Quantities and types of ceramides and their relationships to physical properties of the horn covering the claws of clinically normal cows and cows with subclinical laminitis were investigated. Total ceramide content of the horn covering the sole and wall from cows with subclinical laminitis was 872.2 +/- 146.6 microg/g and 528.6 +/- 61.3 microg/g, respectively, and was significantly (P < 0.01, 0.05) lower than that from clinically normal cows. The mean moisture content in the claws from cows with subclinical laminitis (43.5% +/- 4.3%) was significantly (P < 0.05) higher than that in the claws from clinically normal cows. The hardness of claws from cows with subclinical laminitis (35.2 +/- 3.5) was significantly (P < 0.05) less than that of claws from clinically normal cows. Significant correlations between ceramides and moisture content (P < 0.001) and between ceramide and hardness (P < 0.001) were found in clinically normal cows and cows with subclinical laminitis. Our results indicate that decreases in ceramide contents may be related to changes in physical properties of the horn covering the claw in cows with subclinical laminitis. 相似文献