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61.
S Fukumoto K Etani K Toi M Hanadate M Hidaka K Yokoya T Hiramatsu T Iguchi S Kudo K Miyamoto 《Nippon juigaku zasshi. The Japanese journal of veterinary science》1990,52(2):379-385
The prevalence and intensity of infection with abomasal nematodiasis was studied in dairy cattle of Hokkaido, northern Japan, for successive two years. During the period of March in 1985 to September in 1987, a total number of 393 abomasa of Holstein-Friesian cows was examined for nematode parasites. Nematodes were detected from 75% of the cows. The prevalence of nematode species detected was Ostertagia ostertagi 250 (63.6%), Mecistocirrus digitatus 181 (46.1%), Trichostrongylus axei 85 (21.6%) and Haemonchus sp. 1 (0.3%). The prevalence and population composition of each growth stage varied seasonally in O. ostertagi and M. digitatus. The large percentage of arrested larvae, early L4 O. ostertagi and immature L5 M. digitatus, detected during the mid-winter and the increasing percentage of matured adult populations of both species in early spring revealed the occurrence of the autumn associated arrested development (hypobiosis) phenomenon in bovine abomasum nematodes of Japan. 相似文献
62.
Yasutomo Hori Masayuki Iguchi Yasuhiro Heishima Yohei Yamashita Kensuke Nakamura Atsushi Hirakawa Akihito Kitade Toshiki Ibaragi Michio Katagi Tamotsu Sawada Masashi Yuki Nobuyuki Kanno Haruki Inaba Noriko Isayama Hideyuki Onodera Naoki Iwasa Mikio Kino Mikihiro Narukawa Syuhei Uchida 《Journal of veterinary internal medicine / American College of Veterinary Internal Medicine》2018,32(3):922-929
63.
Hiraga T Ohyama K Hashigaya A Ishikawa T Muramoto W Kitagawa H Mizuno N Teraoka H 《Veterinary journal (London, England : 1997)》2008,178(1):109-114
Lead (Pb) shot were administered orally to young chickens to determine the effects on red blood cells (RBCs). The concentrations of Pb in the blood of young chickens rose rapidly after Pb administration and were maintained at high levels for several days. The number of RBCs with pycnotic nuclei, reticulocytes and enucleated RBCs increased concurrently. Pycnotic nuclei were surrounded by enlarged nucleolemmal cisternae, which sometimes opened to the extracellular space. Gel electrophoresis showed that the presence of pycnotic nuclei was not associated with DNA fragmentation typical of apoptosis. It was concluded that exposure to lead shot changes nuclear morphology in the peripheral blood of domestic fowl. 相似文献
64.
Yoshihara S Hattori J Nishizono K Kawamura A Shimozaki K Nishida Y Oda K Tsuji N Hirayama N 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(10):1129-1131
Group A consisted of chickens infected with a single dose of Ascaris suum and group B of chickens infected with two successive doses. At days 1, 3, 7, 14 and 21 after the first or second infection dose, six chickens from each group were sacrificed. In both groups, larvae were recovered from the livers on days 1, 3, and 7 and lungs on days 3 and 7. No larvae were detected in chickens on day 14. Clear white lesions were noticed only on the livers from chickens of group B at day 7 but had disappeared at day 14. A comparison with group B showed mild histological changes that developed relative to the livers from group A. 相似文献
65.
Kobayashi T Takita Y Suzuki A Katsu Y Iguchi T Ohta Y 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2008,70(1):115-118
ORP150 is a hypoxic stress-induced protein located in the endoplasmic reticulum. Transgenic mice overexpressing ORP150 (ORP-Tg) exhibit vacuolar degeneration in the heart. To determine whether vacuolization is present in skeletal muscle, we pathologically examined ORP-Tg mice. After 60 days of age, severe vacuolization was found in the soleus muscles of the hind legs of the ORP-Tg mice. Immunohistochemical staining of ORP150 revealed co-localization of ORP150 and vacuolization in the affected cells. Electron microscopy revealed a marked increase in the number of rough-surfaced endoplasmic reticula (rER) and distention of the cisterna. These findings suggest that overexpression of ORP150 causes accumulation of ORP150 in the rER, resulting in vacuolar degeneration in the skeletal muscle of ORP-Tg mice. 相似文献
66.
Ayano HIRAKO Jin SUN Satoshi FURUKAWA Takashi TAKEUCHI Akihiko SUGIYAMA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2015,77(12):1565-1571
Two-day-old rats were treated with subcutaneous injections of methotrexate (MTX) 5 mg/kg
and 150 mg/kg, and their rostral migratory streams (RMS) were examined time-dependently.
MTX treatment increased pyknotic and TUNEL-positive cells and decreased mitotic and
phospho-Histone H3-positive cells at almost all time points in the vertical arm, elbow and
horizontal arm regions of the RMS. There were more TUNEL-positive cells ratio in the MTX
150 mg/kg group than in the MTX 5 mg/kg group. Treatment with MTX 150 mg/kg decreased the
cellularity in the vertical arm region on Postnatal day (PD) 4, but that with the MTX 5
mg/kg did not. TUNEL-positive cells ratio was the highest in the vertical arm region,
followed by elbow and horizontal regions in both MTX-treated groups. TUNEL-positive cells
ratio in the vertical arm and elbow regions reached their peaks on PD 4 in both
MTX-treated groups, and both MTX-treatments significantly decreased Phospho-Histone
H3-positive cells ratio on PDs 2.5 and 3 in the vertical arm, elbow and horizontal arm
regions. The phospho-Histone H3-positive cells ratio in the vertical arm region recovered
on PD4 in the MTX 150 mg/kg group. These findings suggested that RMS required a great
amount of folic acid on PD 2 and that the folic acid-requirement differed depending on the
anatomical region of the RMS. To our knowledge, this is the first report demonstrating the
effect of MTX on the RMS and the necessity of the folic acid metabolism on RMS development
in newborn rats. 相似文献
67.
We examined the effects of interstitial space between stream substrate particles on the colonization of aquatic organisms using three types of substrates (gravel, a cobble, and a cobble on gravel) in a riffle and pool of a temperate stream. Significantly greater abundance, wet weight, diversity (H′), taxonomic richness, and evenness of aquatic organisms were found in the riffle than in the pool, and the interstitial space substrate (i.e., a cobble on gravel) had significantly greater abundance, wet weight, and taxonomic richness of aquatic organisms than did the cobble substrate. Of the 13 families observed in the experiments, larval net-spinning caddisfly (Hydropsychidae) dominated the riffle in terms of the abundance and wet weight; chironomid larvae dominated both the riffle and the pool in terms of abundance. Simple main effect tests indicated significant effects of substrate on the abundance and wet weight of larval caddisfly in the riffle, and post hoc tests on substrate in each habitat indicated that the abundance and wet weight of larval caddisfly on interstitial space substrate were significantly greater than those on cobble substrate in the riffle. Our results suggest the importance of interstitial space between stream substrates in riffles to ensure higher colonization rates of aquatic organisms such as larval net-spinning caddisflies characterized as filter feeders. 相似文献
68.
Ryota Suwa Masako Nakamura Masaya Morita Kazuaki Shimada Akira Iguchi Kazuhiko Sakai Atsushi Suzuki 《Fisheries Science》2010,76(1):93-99
Ocean acidification, caused by increased atmospheric carbon dioxide (CO2) concentrations, is currently an important environmental problem. It is therefore necessary to investigate the effects of ocean acidification on all life stages of a wide range of marine organisms. However, few studies have examined the effects of increased CO2 on early life stages of organisms, including corals. Using a range of pH values (pH 7.3, 7.6, and 8.0) in manipulative duplicate aquarium experiments, we have evaluated the effects of increased CO2 on early life stages (larval and polyp stages) of Acropora spp. with the aim of estimating CO2 tolerance thresholds at these stages. Larval survival rates did not differ significantly between the reduced pH and control conditions. In contrast, polyp growth and algal infection rates were significantly decreased at reduced pH levels compared to control conditions. These results suggest that future ocean acidification may lead to reduced primary polyp growth and delayed establishment of symbiosis. Stress exposure experiments using longer experimental time scales and lower levels of CO2 concentrations than those used in this study are needed to establish the threshold of CO2 emissions required to sustain coral reef ecosystems. 相似文献
69.
70.
Kazuhiro KOJIMA James K. CHAMBERS Ayano ISHII Kazuhito SEGAWA Kazuyuki UCHIDA 《The Journal of veterinary medical science / the Japanese Society of Veterinary Science》2022,84(2):213
An 8-year 8-month-old castrated male Munchkin presented with vomiting, anorexia and hypoactivity. Computed tomography revealed excessive gas accumulation within the intestinal lumen and gas bubbles in the liver, spleen, and portal venous system, indicating hepatic portal venous gas. The cat died without any significant improvement, and mild splenomegaly was found at necropsy. Histologically, multiple gas vacuoles were diffusely observed in the liver and spleen. In the stomach, multiple gas vacuoles and scattered focal ulcers were detected within the mucosa. Multifocal hemorrhage was noted in the small and large intestines, whereas gas vacuoles were not present. Based on these findings, a gastric ulcer under high gas pressure may have provided an entry point for gas into the portal venous system. 相似文献