Prevalence of zoonotic Bartonella species among rodents and shrews in Thailand     

Decha Pangjai  Soichi Maruyama  Sumalee Boonmar  Hidenori Kabeya  Shingo Sato  Burin Nimsuphan  Wimol Petkanchanapong  Wattanapong Wootta  Piyada Wangroongsarb  Maskiet Boonyareth  Poom Preedakoon  Watcharee Saisongkorh  Pathom Sawanpanyalert 《Comparative immunology, microbiology and infectious diseases》2014

We investigated the prevalence of Bartonella species in 10 rodent and one shrew species in Thailand. From February 2008 to May 2010, a total of 375 small animals were captured in 9 provinces in Thailand. Bartonella strains were isolated from 57 rodents (54 from Rattus species and 3 from Bandicota indica) and one shrew (Suncus murinus) in 7 of the 9 provinces, and identified to the species level. Sequence analysis of the citrate synthase and RNA polymerase β subunit genes identified the 58 isolates from each Bartonella-positive animal as B. tribocorum in 27 (46.6%) animals, B. rattimassiliensis in 17 (29.3%) animals, B. elizabethae in 10 (17.2%) animals and B. queenslandensis in 4 (6.9%) animals. R. norvegicus, R. rattus, and Suncus murinus carried B. elizabethae, which causes endocarditis in humans. The prevalence of Bartonella bacteremic animals by province was 42.9% of the animals collected in Phang Nga, 26.8% in Chiang Rai, 20.4% in Sa Kaeo, 16.7% in Nakhon Si Thammarat, 12.0% in Surat Thani, 9.1% in Mae Hong Son and Loei Provinces.  相似文献   

Evidence of multiple spawning in wild amphidromous type ayu     

Akio?ShimizuEmail author  Kazuo?Uchida  Shin-Ichiro?Abe  Miho?Udagawa  Toshihiko?Sato  Kazuhiko?Katsura 《Fisheries Science》2005,71(6):1379-1381

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Reproduction related immunoglobulin changes in rainbow trout   总被引：4，自引：1，他引：4  

Y. Suzuki  T. Otaka  S. Sato  Y.Y. Hou  K. Aida 《Fish physiology and biochemistry》1997,17(1-6):415-421

Annual changes in plasma immunoglobulin (IgM) levels were investigated in three strains of rainbow trout Oncorhynchus mykiss which have different spawning periods, i.e., September–October, November–December, and January, reared under constant water temperature and natural day length. Plasma IgM levels decreased during the spawning season in all strains tested. The IgM changes became reversed in response to significant increases in plasma testosterone (T) and estradiol-17 in females and T and 11-ketotestosterone in males. Though the IgM decline showed a connection with suppressed immunocompetence, since many mature fish caught fungal diseases, no clear differences were observed in the plasma IgM levels between infected and noninfected fish during the spawning season. Incidentally, plasma IgM levels in infection prone fish were higher than in noninfection prone fish prior to the spawning season, whereas coincident differences in the plasma steroid levels were observed. Immature fish reared under lower water temperatures showed lower IgM levels. The effect of water temperature may have to be considered when analyzing the defense mechanism during the spawning season in rainbow trout.  相似文献   

Peripheral coding of sex pheromone information in the goldfish olfactory epithelium     

K. Sato  P.W. Sorensen 《Fish physiology and biochemistry》2003,28(1-4):277-278

Neural responses to sex pheromones and food-related odorants were recorded from single olfactory receptor neurons (ORNs) in the olfactory epithelium of male goldfish. Very few ORNs responded to sex pheromones and those that did were tuned to one compound. In contrast, amino acid-sensitive units were common and often responded to another class of food odor.  相似文献   

The protective effect of stevia extract on the gastric mucosa of rainbow trout Oncorhynchus mykiss (Walbaum) fed dietary histamine   总被引：1，自引：0，他引：1  

Kazuhiro Shiozaki  Toshiki Nakano  Toshiyasu Yamaguchi  Minoru Sato  & Naohiko Sato 《Aquaculture Research》2004,35(15):1421-1428

Stevia extract was made from stevia stem by extraction with boiling water and fermentation. The protective effect of a Stevia extract on rainbow trout (average weight, 12 g) fed 1% of dietary histamine for 4 weeks was investigated. Administration of dietary histamine to trout did not result in a reduction in growth rate or feed consumption but caused a gastric abnormality, e.g. exfoliation of the mucosal epithelium and atrophy of mucosal lamina propria. Stevia extract protected gastric tissue from histamine‐induced damage. Pepsin activity in gastric fluid increased and liver α‐tocopherol content was reduced after histamine treatment, but Stevia treatment prevented these abnormalities. The results suggest that the stevia extract might protect the rainbow trout stomach from histamine toxicity.  相似文献   

A simple and rapid method for the analysis of fish histamine by paper electrophoresis     

Minoru Sato  Zhi Hua Tao  Kazuhiro Shiozaki  Toshiki Nakano  Toshiyasu Yamaguchi  Takehiko Yokoyama  Nobuhiro Kan-No  Eizoh Nagahisa 《Fisheries Science》2006,72(4):889-892

ABSTRACT:   The described analytical method for histamine determination in fish and seafood consists of sample extraction, adsorption onto a paper disc, application of the paper disc onto electrophoresis paper, electrophoresis for only 10 min, drying, and color developing by Pauly's reagent. Histamine can be satisfactorily detected and completely separated from histidine, carnosine and other Pauly reagent-positive compounds. This method does not require expensive instrumentation and any tedious pretreatment to eliminate potential interference by other imidazole compounds, such as histidine or carnosine. This method can be used to detect histamine in multiple fish and seafood samples simultaneously that contain as little as 15 p.p.m. histamine (1.5 mg/100 g).  相似文献   

Sorption Behavior of Arsenate by Mg-Bearing Minerals at Hyperalkaline Condition: Implications for Oxyanions Sequestration During the Use and Disposal of Alkaline Wastes     

Einstine Opiso  Atsushi Asai  Tsutomu Sato  Tetsuro Yoneda  Xiaoji Liu 《Water, air, and soil pollution》2012,223(6):3471-3483

The utilization and disposal of alkaline waste materials such as slag and coal fly ash as cement aggregates and raw materials in cement manufacturing can pose environmental and health hazards because these waste materials usually contain elevated concentration of toxic elements. This study examined the possibility of controlling the pore water chemistry of these waste materials in order to induce the secondary mineral formation of Mg-bearing minerals as major sorbing solids for oxyanions during the utilization and disposal of alkaline wastes. The formation of Mg-bearing minerals was examined at ambient temperature and alkaline pH conditions in the Mg?CSi?CAl system. The interaction of Mg-bearing minerals with oxyanions using arsenate as an analog was examined during and after mineral formation. The results revealed that the generated Mg-bearing mineral phases were smectite and brucite in Mg?CSi system and hydrotalcite and serpentine in Mg?CSi?CAl system. Moreover, hydrotalcite, serpentine, brucite, and smectite phases formed under low Si ratio showed high sorption capacity for arsenate, but only high Al content hydrotalcite and serpentine showed substantial irreversible fraction of sorbed arsenate. Hence, the generation of these kinds of hydrotalcite and serpentine phases as scavengers for oxyanions must be considered during the utilization and disposal of alkaline wastes.  相似文献   

Individual difference in serum oxytocin concentrations of calves and the correlation with those in dams     

Siyu Chen  Shigefumi Tanaka  Chisako Oyakawa  Sanggun Roh  Shusuke Sato 《Animal Science Journal》2014,85(1):53-57

We examined individual differences in serum oxytocin concentrations (OT) of calves, and assessed whether these differences were correlated with their dams’ milk and serum OT. Eight Holstein (H), nine Japanese Shorthorn (JS), and six Japanese Black (JB) calves were examined. Blood was collected three times during the first month in H calves, while their dams’ blood was collected three times prior to parturition. Milk was collected twice after parturition from H cows. Blood from JS and JB calves were collected at 1 and 4 months old, while of their dams only once before parturition. Serum OT in H calves at 7 days old was significantly correlated with that at 30 days. Serum OT of JS calves at 1 month old was significantly correlated to that at 4 months, while of JB calves was also positively correlated (r = 0.70). Serum OT of calves showed significant individual differences in each breed. Serum OT of calves was not correlated with the milk OT of dams, except for 3‐day‐old calves that fed on their dams’ milk. We concluded that although serum OT differed among individuals, this difference was stable within each individual and not affected by the serum OT of the dams.  相似文献   

Kinematic gait analysis and lactation performance in dairy cows fed a diet supplemented with zinc,manganese, copper and cobalt     

Satoshi Yamamoto  Kazuhiko Ito  Kii Suzuki  Yuki Matsushima  Izumi Watanabe  Yutaka Watanabe  Keima Abiko  Toshihiko Kamada  Kan Sato 《Animal Science Journal》2014,85(3):330-335

This study investigated how supplementation of the diet of dairy cows with trace minerals (zinc, manganese, copper and cobalt) affected kinematic gait parameters and lactation performance. Eight Holstein cows were divided into two groups, with each group receiving a different dietary treatment (control diet, or control diet supplemented with trace minerals) in a two‐period crossover design. Kinematic gait parameters were calculated by using image analysis software. Compared to cows fed the control diet, cows that received the trace mineral‐supplemented diet exhibited significantly increased walking and stepping rates, and had a shorter stance duration. Feed intake and milk production increased in cows fed the trace mineral‐supplemented diet compared with control groups. The plasma manganese concentration was not different in control and experimental cows. In contrast, cobalt was only detected in the plasma of cows fed the supplemented diet. These results provide the first evidence that trace mineral supplementation of the diet of dairy cows affects locomotion, and that the associated gait changes can be detected by using kinematic gait analysis. Moreover, trace mineral supplementation improved milk production and only minimally altered blood and physiological parameters in dairy cows.  相似文献   

Actions of intravenous injections of AVP and oxytocin on plasma ACTH,GH, insulin and glucagon concentrations in goats     

Sang‐gun Roh  Kohta Koiwa  Katsuyoshi Sato  Yoshihisa Ohtani  Tatsuyuki Takahashi  Kazuo Katoh 《Animal Science Journal》2014,85(3):286-292

This study was conducted to investigate the arginine‐vasopressin (AVP)‐ and oxytocin‐induced changes in plasma adrenocorticotropic hormone (ACTH), growth hormone (GH), insulin and glucagon levels and their metabolite concentrations in goats. In this study, five goats were intravenously injected with either AVP (0.3 nmol/kg body weight (BW)) or oxytocin (0.7 IU/kg BW). AVP injection significantly increased ACTH and GH secretions compared to controls, although insulin and glucagon concentrations were not altered. The incremental areas (ICAs) of the ACTH and GH concentrations were higher in the AVP group than in the saline group. Oxytocin injections increased insulin and glucagon secretions, while ACTH level was not altered. GH levels became elevated 30 min after the oxytocin injection. The ICAs of insulin and glucagon after oxytocin was injected were higher than those of the control. Results indicate that AVP is a potent stimulant of ACTH and GH secretions, while oxytocin uses different pathways to regulate insulin and glucagon secretions in goats.  相似文献