Comparative Biochemistry and Physiology Part B: Comparative Biochemistry最新文献_第3页

Effects of ionic environment on viscosity of Triton-extracted catch connective tissue of a sea cucumber body wall 离子环境对海参体壁吸附结缔组织黏度的影响

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-12-01 DOI: 10.1016/0305-0491(94)90124-4

T. Motokawa

引用次数: 44

Lipid composition of liver peroxisomes isolated from untreated and clofibrate-treated mice and rats 从未治疗和氯贝特治疗的小鼠和大鼠分离肝脏过氧化物酶体的脂质组成

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-12-01 DOI: 10.1016/0305-0491(94)90129-5

Titus Kyrklund , Johan Meijer

引用次数: 8

Transposable elements in mosquitoes and other insect species 蚊子和其他昆虫物种中的转座因子

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-12-01 DOI: 10.1016/0305-0491(94)90115-5

J.C. Salvado, N. Bensaadi-Merchermek, C. Mouchès

{"title":"Transposable elements in mosquitoes and other insect species","authors":"J.C. Salvado, N. Bensaadi-Merchermek, C. Mouchès","doi":"10.1016/0305-0491(94)90115-5","DOIUrl":"10.1016/0305-0491(94)90115-5","url":null,"abstract":"<div>Insect transposable elements occur as intracellular parasitic DNA sequences which are amplified in genomes either by a pure DNA replication mechanism, or for the most frequent elements, via reverse transcription of an RNA intermediate. Due to their structural properties and their coding potential, many of them are potentially able to invade the chromosomes. However, selection pressures and evolution have apparently established true host-parasite relationships between these “selfish” sequences and the genomes which harbour them. Transposable elements seem to be expressed only occasionally, upon stimulation by genetic or environmental factors or in situations of “genomic shocks” induced by stresses. Such an activation of a given entity in the germline will result in the amplification and dispersion of daughter copies into the host genome. This appears to have occurred recently in mosquito chromosomes for the Juan retroposons: they have been probably amplified from one master element present in a unique population which has since spread worldwide. Horizontal transfers between species might also contribute to the spread of some elements, a fact which can restrict the use of recombinant organisms in the field. There is strong evidence that transposable elements are responsible for variability and biodiversity of insect populations. For example, in Culex pipiens mosquitoes, transposition events are responsible for polymorphism in the region of the esterase B gene locus and for insecticide resistance properties. Because they may affect the biological properties of individuals carrying them, transposable elements can be tools for the development of efficient genetical control methods of pest species.</div>","PeriodicalId":100294,"journal":{"name":"Comparative Biochemistry and Physiology Part B: Comparative Biochemistry","volume":"109 4","pages":"Pages 531-544"},"PeriodicalIF":0.0,"publicationDate":"1994-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0305-0491(94)90115-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80488261","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: 4

Differences in lipid composition of cell membranes from Antarctic and Mediterranean scallops 南极和地中海扇贝细胞膜脂质组成的差异

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-12-01 DOI: 10.1016/0305-0491(94)90120-1

A. Viarengo, R. Accomando , G. Roma , U. Benatti , G. Damonte , M. Orunesu

引用次数: 26

The effect of GTP on the aluminum fluoride- and forskolin-activated adenylyl cyclase from human embryonic kidney 293 cells GTP对人胚胎肾293细胞氟化铝和福斯克林激活腺苷酸环化酶的影响

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90019-1

Jesus Sanchez-Yagüe, Marina C. Rodriguez, Marcial Llanillo, Angel Hernandez-Hernandez

{"title":"The effect of GTP on the aluminum fluoride- and forskolin-activated adenylyl cyclase from human embryonic kidney 293 cells","authors":"Jesus Sanchez-Yagüe, Marina C. Rodriguez, Marcial Llanillo, Angel Hernandez-Hernandez","doi":"10.1016/0305-0491(94)90019-1","DOIUrl":"10.1016/0305-0491(94)90019-1","url":null,"abstract":"<div>GTP has been shown to inhibit AlF4−-stimulated, and to activate forskolin-stimulated adenylyl cyclase activity in the presence of Mg2+ in cell membranes from human embryonic kidney 293 cells. The maximal inhibitory response of AlF4−-stimulated adenylyl cyclase activity by GTP was not dependent on the concentration of Mg2+, but was so in the case of forskolin-activated activity at all forskolin concentrations assayed. Mn2+ ions stimulated AlF4−- or forskolin-activated adenylyl cyclase activity to a greater extent than Mg2+. The inhibition of AlF4−-stimulated cyclase by GTP was still observed with Mn2+, but the activation of forskolin-stimulated cyclase by GTP was not. When assayed together, Mn2+ and Mg2+ showed non-additive behaviours with respect to the amount of cyclic AMP formed after AlF4−-stimulation of adenylyl cyclase. The temperature dependence of the activation of adenylyl cyclase by forskolin, AlF4− or under basal conditions was observed to be somehow different in the presence of Mn2+ than in the presence of Mg2+ ions. Cholera toxin treatment produced a markedly increased cyclase activity, specially when assayed with AlF4−. In the case of forskolin-activated adenylyl cyclase, UTP and CTP were unable to reproduce the cyclase activation detected with GTP. However, in the case of AlF4−-stimulated adenylyl cyclase, UTP was as good as GTP at inhibiting cyclase activity, and CTP virtually eliminated the activation of the cyclase with AlF4−.</div>","PeriodicalId":100294,"journal":{"name":"Comparative Biochemistry and Physiology Part B: Comparative Biochemistry","volume":"109 2","pages":"Pages 359-369"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0305-0491(94)90019-1","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18558305","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: 1

Relationship between plasmin-trypsin-inhibitory and sialyltransferase activities 纤溶酶-胰蛋白酶抑制与唾液转移酶活性的关系

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90030-2

Sheila Nadkarni, Sailen Mookerjea

{"title":"Relationship between plasmin-trypsin-inhibitory and sialyltransferase activities","authors":"Sheila Nadkarni, Sailen Mookerjea","doi":"10.1016/0305-0491(94)90030-2","DOIUrl":"10.1016/0305-0491(94)90030-2","url":null,"abstract":"<div>Previously we have shown that the measurable soluble sialyltransferase (STase) activity released into the medium during the incubation of rat jejunal slices was dependent upon the presence of a heparin-binding fraction (HBF) from heat-inactivated serum or a trypsin-binding protein (TBP) isolated from HBF. Both HBF and TBP were able to inhibit trypsin and plasmin. The measurement of galactosyltransferase (GTase) activity which was also released in incubations was not dependent on HBF or TBP. The present study is directed towards further exploring the relationship between STase activity and protease inhibitory activity. Heat-inactivated serum from turpentine-treated rats (HTS), had higher plasmin-trypsin-inhibitory (HTS) activities compared to heat-inactivated serum from control rats (HCS). When HTS was used to supplement jejunal incubations, there was a 25–40% increase in the measurable STase activity in the incubation medium compared to similar incubations carried out in buffer alone. In contrast, with HCS the increase was 10–15%. During incubations with hepatocytes, STase activity detected in the incubation medium was increased with the incubation buffer was supplemented with HTS compared to incubations supplemented with HCS. Serum antiproteolytic activity was higher in turpentine rats compared to controls. Incubation of serum at 37°C led to a progressive decrease in plasmin-trypsin-inhibitory and STase activities. TBP a plasmin and trypsin inhibitor was able to prevent the decrease in STase activity. Overall, serum STase activity was higher in the turpentine treated rats. In contrast, GTase activity in serum as well as that detected in the medium during jejunal and hepatocyte incubations was not dependent on protease inhibitory activity. The results show that there is a relationship between soluble STase and plasmin-trypsin-inhibitory activities.</div>","PeriodicalId":100294,"journal":{"name":"Comparative Biochemistry and Physiology Part B: Comparative Biochemistry","volume":"109 2","pages":"Pages 465-471"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0305-0491(94)90030-2","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18559826","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

Aminotransferase activities in mouse, Mus domesticus, erythrocytes separated according to age 家鼠按年龄分离红细胞的转氨酶活性

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90032-9

Judy A. Westrick, Andrew Smolen

{"title":"Aminotransferase activities in mouse, Mus domesticus, erythrocytes separated according to age","authors":"Judy A. Westrick, Andrew Smolen","doi":"10.1016/0305-0491(94)90032-9","DOIUrl":"10.1016/0305-0491(94)90032-9","url":null,"abstract":"<div>Erythrocyte aspartate aminotransferase (AST) and alanine aminotransferase (ALT) activities are often used as indices of vitamin B-6 nutritional status; however, results using a mixed population of erythrocytes can be qulte variable. Erythrocytes from two strains of mice (Mus domesticus), A/Ibg and DBA/Ibg, were separated according to age by centrifugation through discontinuous Percoll density gradients into three fractions: top (least dense, youngest), middle and bottom (most dense, oldest). A sufiicient yield of age-fractionated erythrocytes was obtained from a single mouse for all of the enzyme measurements. The activities of AST, ALT and three age-marker enzymes, pyruvate kinase, acetylcholinesterase and hexokinase, were found to be significantly higher in the youngest cell fractions, and declined in the older, more dense fractions. A mice had significantly lower AST and ALT activities in the age separated fractions than did DBA mice. The measurement of enzyme activities in low density, young cells may be especially useful in studies involving conditions in which the proportion of young erythrocytes may be elevated with respect to the entire erythrocyte mass.</div>","PeriodicalId":100294,"journal":{"name":"Comparative Biochemistry and Physiology Part B: Comparative Biochemistry","volume":"109 2","pages":"Pages 489-497"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0305-0491(94)90032-9","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18560847","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: 4

Lipids and proteins in the Rathke's gland secretions of the North American mud turtle (Kinosternon subrubrum) 北美泥龟(Kinosternon subbrubrum)拉氏腺分泌物中的脂质和蛋白质

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90029-9

William E. Seifert Jr , Steve W. Gotte , Thomas L. Leto , Paul J. Weldon

引用次数: 9

Fatty acid binding protein in locust and mammalian muscle. Comparison of structure, function and regulation 蝗虫和哺乳动物肌肉中的脂肪酸结合蛋白。结构、功能和调节的比较

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90003-5

Norbert H. Haunerland

{"title":"Fatty acid binding protein in locust and mammalian muscle. Comparison of structure, function and regulation","authors":"Norbert H. Haunerland","doi":"10.1016/0305-0491(94)90003-5","DOIUrl":"10.1016/0305-0491(94)90003-5","url":null,"abstract":"<div>The flight muscle of adult desert locusts, Schistocerca gregaria, contains a fatty acid binding protein (FABP) that is homologous to mammalian M-FABP (cardiac FABP). In spite of the evolutionary distance between invertebrates and vertebrates, locust muscle FABP is similar to cardiac FABP in its amino acid sequence, structure, and binding behavior. While cardiac FABP is present already in the prenatal period, locust FABP is an adult specific protein; its expression is directly linked to metamorphosis. A correlation seems to exist between fatty acid oxidative capacity and FABP content in both locust and mammals. To accomplish the higher metabolic rate encountered during migratory flight, locust flight muscle cytosol contains more than three times as much FABP as that in mammalian heart. Increased fatty acid utilization by exercise or endurance training apparently induces FABP expression. Similarities and differences between vertebrate and invertebrate M-FABP are discussed in light of the proposed functions of muscle FABP as fatty acid transporter and cytoprotectant.</div>","PeriodicalId":100294,"journal":{"name":"Comparative Biochemistry and Physiology Part B: Comparative Biochemistry","volume":"109 2","pages":"Pages 199-208"},"PeriodicalIF":0.0,"publicationDate":"1994-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/0305-0491(94)90003-5","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"18561068","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: 34

Comparative study of the endemic freshwater fauna of Lake Baikal—VI. Unusual fatty acid and lipid composition of the endemic sponge Lubomirskia baicalensis and its amphipod crustacean parasite Brandtia (Spinacanthus) parasitica 贝加尔湖特有淡水动物群的比较研究。黄芩地方性海绵Lubomirskia baicalensis及其片足纲甲壳类寄生虫Brandtia (Spinacanthus)寄生的不寻常脂肪酸和脂质组成

Comparative Biochemistry and Physiology Part B: Comparative Biochemistry Pub Date : 1994-10-01 DOI: 10.1016/0305-0491(94)90024-8

Valery M. Dembitsky , Tomá< Rezanka , Andrey G. Kashin

引用次数: 24