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Comparative biochemistry and physiology. Comparative physiology最新文献

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Phosphate metabolism during muscular contraction in starved frogs (Rana catesbeiana). 饥饿青蛙肌肉收缩过程中的磷酸盐代谢。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-12-01
A Chiba, M Takashima, M Hamaguchi, S Chichibu
{"title":"Phosphate metabolism during muscular contraction in starved frogs (Rana catesbeiana).","authors":"A Chiba,&nbsp;M Takashima,&nbsp;M Hamaguchi,&nbsp;S Chichibu","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. The muscle tension and the state of high-energy phosphate metabolism during contraction of the sartorius muscle in frogs (Rana catesbeiana) starved for 1-5 months was studied by in vivo 31P-NMR spectrometry. 2. Muscle tension began to decrease after 2-month starvation compared with the control group and decreased to about one-third of the control value after a 5-month starvation. 3. Muscle contraction induced by electrical stimulation or the use of anaerobic perfusion fluid did not decrease the concentration of creatine phosphate (PCr) or beta-ATP, and only negligibly changed the PCr/Pi ratio from starvation. 4. These results suggest a decrease in creatine kinase activity in the muscle of starved frogs.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"106 4","pages":"725-9"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18903861","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
31P-NMR study on effects of electric shock on swimming leeches, Hirudo medicinalis. 电刺激对水蛭影响的31P-NMR研究。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-10-01
A Chiba, S Chichibu
{"title":"31P-NMR study on effects of electric shock on swimming leeches, Hirudo medicinalis.","authors":"A Chiba,&nbsp;S Chichibu","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. We evaluated the effect of electric shock on swimming leeches by measuring changes in high-energy phosphate metabolism using in vivo 31P-NMR. 2. Leeches electrically stimulated during swimming showed anodal galvanotaxis and stopped swimming with stimulation at strong current. 3. Comparison of the concentrations of high-energy phosphate metabolites before and after electric shock using 31P-NMR revealed a marked decrease in beta-ATP and an increase in that of Pi. 4. Electric shock apparently induces excessive muscle fatigue in leeches, resulting in transient paralysis.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"106 2","pages":"239-43"},"PeriodicalIF":0.0,"publicationDate":"1993-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18902034","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Voltage clamping of a frog (Rana catesbeiana) taste cell with a single microelectrode. 用单个微电极对蛙(蛙)味觉细胞进行电压箝位。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-09-01
Y Okada, T Miyamoto, T Sato
{"title":"Voltage clamping of a frog (Rana catesbeiana) taste cell with a single microelectrode.","authors":"Y Okada,&nbsp;T Miyamoto,&nbsp;T Sato","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Receptor currents in frog taste cells induced by taste stimuli of NaCl and HCl were studied in situ using a voltage clamp method with a single microelectrode. 2. Under voltage clamping of a taste cell at -20 mV an inward receptor current of a mean of 176 pA was induced by taste stimulation with 0.5 M NaCl and the input resistance was largely reduced during the stimulation. 3. A large sustained inward current was evoked by HCl stimulation but the input resistance was slightly reduced. 4. Increasing the holding potential in the negative direction linearly increased the inward receptor current by NaCl stimulation but did not remarkably change it by HCl stimulation.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"106 1","pages":"37-41"},"PeriodicalIF":0.0,"publicationDate":"1993-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19098134","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Contribution of proton transporter to acid-induced receptor potential in frog taste cells. 质子转运体对酸诱导蛙味觉细胞受体电位的贡献。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-08-01
Y Okada, T Miyamoto, T Sato
{"title":"Contribution of proton transporter to acid-induced receptor potential in frog taste cells.","authors":"Y Okada,&nbsp;T Miyamoto,&nbsp;T Sato","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. The generative mechanism of the acid-induced receptor potential in frog taste cells was re-examined with micro-electrodes. 2. The amplitude of receptor potentials in a taste cell induced by 1 mM acetic acid increased as the concentration of Ca2+, Sr2+ and Ba2+ on the tongue surface was increased. 3. The amplitude of the acid-induced receptor potential was inhibited by about 40% by a proton pump blocker DCCD (N,N'-dicyclohexylcarbodiimide) added to superficial normal saline. 4. It is concluded that most of the acid-induced response in a frog taste cell was generated by current carried through proton-gated Ca2+ channel of the apical receptive membrane. The remaining part of the acid response was generated by current carried through a DCCD-sensitive proton transporter of the receptive membrane.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 4","pages":"725-8"},"PeriodicalIF":0.0,"publicationDate":"1993-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18691635","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Sexual dimorphism of binding sites of testosterone and dihydrotestosterone in rabbit model. 兔模型睾酮和二氢睾酮结合位点的两性二态性。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-08-01
T Tamaya, K Wada, M Nakagawa, R Misao, T Itoh, A Imai, H Mori
{"title":"Sexual dimorphism of binding sites of testosterone and dihydrotestosterone in rabbit model.","authors":"T Tamaya,&nbsp;K Wada,&nbsp;M Nakagawa,&nbsp;R Misao,&nbsp;T Itoh,&nbsp;A Imai,&nbsp;H Mori","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Binding sites for testosterone (TR) and dihydrotestosterone (DHTR) were separately detected in various organs of the rabbit. 2. Possibilities obtained were suggested as follows. 3. Sexual dimorphism of TR or DHTR level was present among organs. 4. The responsiveness of TR or DHTR levels to estradiol-17 beta with testosterone, but not estradiol-17 beta alone is different among organs, with sexual minor dimorphism.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 4","pages":"745-9"},"PeriodicalIF":0.0,"publicationDate":"1993-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19095956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Electrophysiological properties of suncus (Suncus murinus) cardiac muscle. 小黑子心肌的电生理特性。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-08-01
K Lee, M Son, H Saito, N Matsuki
{"title":"Electrophysiological properties of suncus (Suncus murinus) cardiac muscle.","authors":"K Lee,&nbsp;M Son,&nbsp;H Saito,&nbsp;N Matsuki","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Electrophysiological properties of cardiac muscle in Suncus murinus were compared with those of rat and guinea pig. 2. The resting potential and resting potassium permeability were smallest in suncus heart. 3. The action potential duration in suncus was also shortest, and effects of tetraethylammonium suggested that transient outward current is well developed in suncus. 4. Elicitation of slow response was very difficult in suncus, suggesting poor development of the calcium channel.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 4","pages":"757-62"},"PeriodicalIF":0.0,"publicationDate":"1993-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19095957","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Nutritional status of wild boar (Sus scrofa): II. Body fat reserves in relation to haematology and blood chemistry. 野猪(Sus scrofa)的营养状况:2。身体脂肪储备与血液学和血液化学有关。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-07-01
J Wolkers, T Wensing, G W Groot Bruinderink, A T Schonewille
{"title":"Nutritional status of wild boar (Sus scrofa): II. Body fat reserves in relation to haematology and blood chemistry.","authors":"J Wolkers,&nbsp;T Wensing,&nbsp;G W Groot Bruinderink,&nbsp;A T Schonewille","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. The relationship between body fat reserves and blood variables was calculated in 26 wild boar in order to evaluate blood variables as indicators for the nutritional status. 2. In juveniles only a relationship between bone marrow fat and haemoglobin, packed cell volume, albumin, total globulin, gamma globulin, alkaline phosphatase and urea were found. 3. Urea and packed cell volume accounted (together) for more than 90% of the variance of bone marrow fat.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 3","pages":"539-42"},"PeriodicalIF":0.0,"publicationDate":"1993-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19094231","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Colonic cell growth and mucin degradation in rats fed diets containing various levels of beta-carotene with and without dietary agar. 饲粮中添加和不添加琼脂时不同水平β -胡萝卜素对大鼠结肠细胞生长和粘蛋白降解的影响。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-06-01
S H Hwa, S Y Shiau
{"title":"Colonic cell growth and mucin degradation in rats fed diets containing various levels of beta-carotene with and without dietary agar.","authors":"S H Hwa,&nbsp;S Y Shiau","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. To either an agar-containing diet or an agar-free diet, 0, 0.3 and 2.0 mg/100 g of beta-carotene were incorporated and fed to groups of five rats for 28 days. 2. Weight gain and food consumption of rats fed different dietary groups did not show a significant difference (P > 0.05). 3. Colon weight, colonic mucosal DNA and RNA were generally higher in rats fed agar diets than rats fed agar-free diets at either beta-carotene supplementation level. 4. Mucinase activity was higher (P < 0.05) in rats fed the agar diet than in rats fed an agar-free diet without beta-carotene. However, the difference was not observed (P > 0.05) when beta-carotene was incorporated. 5. These data suggest that colonic mucin degradation in rats fed an agar diet decreased when the dietary beta-carotene inclusion level increased.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 2","pages":"377-80"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18691976","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Comparative studies of Ca(2+)-ATPase activity in epiphysis of tibiatarsus of quail lines selected for body weight. 体重选择鹌鹑系胫骨骨骺Ca(2+)- atp酶活性的比较研究。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-06-01
S M Ardiningsasi, Y Maeda, K Kawabe, S Okamoto, T Hashiguchi
{"title":"Comparative studies of Ca(2+)-ATPase activity in epiphysis of tibiatarsus of quail lines selected for body weight.","authors":"S M Ardiningsasi,&nbsp;Y Maeda,&nbsp;K Kawabe,&nbsp;S Okamoto,&nbsp;T Hashiguchi","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Ca2+ concentration in blood plasma and Ca(2+)-ATPase activity in epiphysis of tibia at 3 and 15 weeks of age were compared among three quail lines (LL, RR and SS) selected for body weight. 2. The Ca2+ concentrations in blood plasma were higher in order of LL, RR and SS at 3 and 15 weeks of age in both sexes. Ca2+ concentrations in blood plasma at 3 weeks of age were lower than those of 15 weeks of age in both sexes. 3. At 15 weeks of age, the concentration of females was significantly higher than that of males in all lines. 4. The activities of Ca(2+)-ATPase in epiphysis of tibia was higher in order of SS, RR and LL at both ages and in both sexes. 5. The activities of Ca(2+)-ATPase at 3 weeks of age were significantly higher than those of 15 weeks of age in all lines. 6. These results suggest that the selection for body weight changed the concentration of Ca2+ in blood plasma and the activities of Ca(2+)-ATPase in epiphysis of tibia, parallel to the change of tibia length.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"105 2","pages":"219-22"},"PeriodicalIF":0.0,"publicationDate":"1993-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19093537","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
No hypocalcemic action of Stannius corpuscle homogenates in rats. 斯坦尼斯小体匀浆对大鼠无降钙作用。
Comparative biochemistry and physiology. Comparative physiology Pub Date : 1993-04-01
K Ukawa, Y Sasayama
{"title":"No hypocalcemic action of Stannius corpuscle homogenates in rats.","authors":"K Ukawa,&nbsp;Y Sasayama","doi":"","DOIUrl":"","url":null,"abstract":"<p><p>1. Serum Ca level of goldfish administered with homogenate of the corpuscles of Stannius (CS) taken from 1/3 seawater-acclimated goldfish was significantly lower than that of the control goldfish up to 2 hr after administration. 2. Serum Ca, Mg, Pi, Na and K levels of rats administered with CS homogenates of freshwater eels, 1/3 seawater-acclimated goldfish, or seawater-inhabited wrasse were not statistically different from those of control rats during the 3 hr investigation. 3. It was concluded that in rats, CS homogenates did not decrease the serum mineral levels under the present conditions.</p>","PeriodicalId":77080,"journal":{"name":"Comparative biochemistry and physiology. Comparative physiology","volume":"104 4","pages":"825-7"},"PeriodicalIF":0.0,"publicationDate":"1993-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"19090488","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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