Pub Date : 1985-01-01DOI: 10.3891/ACTA.CHEM.SCAND.39A-0367
O. Gropen, A. Haaland, D. Defrees
{"title":"The interaction of main group metals with CC double bonds. Molecular orbital calculations on the model complexes H2Zn C2H4 and H2Mg C2H4.","authors":"O. Gropen, A. Haaland, D. Defrees","doi":"10.3891/ACTA.CHEM.SCAND.39A-0367","DOIUrl":"https://doi.org/10.3891/ACTA.CHEM.SCAND.39A-0367","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"39 5 1","pages":"367-9"},"PeriodicalIF":0.0,"publicationDate":"1985-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69976761","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}
Pub Date : 1979-01-01DOI: 10.3891/acta.chem.scand.33b-0384
H Tjernshaugen
{"title":"Deoxyinosine-activated nucleotidase purified from rat spleen. Evidence for its identity with liver enzyme.","authors":"H Tjernshaugen","doi":"10.3891/acta.chem.scand.33b-0384","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.33b-0384","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"B33 5","pages":"384-90"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11710841","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}
Pub Date : 1979-01-01DOI: 10.3891/acta.chem.scand.33b-0327
P Lehtinen, E Kulonen
The 7000 g pellet of homogenized mature sponge-induced granulation tissue was fractionated by centrifugation in a stepwise sucrose gradient in order to study the synthesis and secretion of collagen and other components of this tissue on the subcellular level. As indicated by chemical and enzymatic assays, by electron microscopy and by incorporation experiments, the collagen-synthethesizing rough endoplasmic reticulum fraction was isolated free from the secretory vesicles (smooth endoplasmic membranes and Golgi elements) and fibrous extracellular matrix. Collagen differed from other proteins in the distribution among the subcellular fractions. In pulse-chase experiment the translocation of 14C-labelled collagen was demonstrated from the rough endoplasmic reticulum through the secretory vesicles to extracellular fibrillar collagen. This fractionation method will be used to study the modulation of collagen synthesis and secretion in the reparative tissue.
{"title":"Preparation of subcellular fractions from granulation tissue by density gradient centrifugation.","authors":"P Lehtinen, E Kulonen","doi":"10.3891/acta.chem.scand.33b-0327","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.33b-0327","url":null,"abstract":"<p><p>The 7000 g pellet of homogenized mature sponge-induced granulation tissue was fractionated by centrifugation in a stepwise sucrose gradient in order to study the synthesis and secretion of collagen and other components of this tissue on the subcellular level. As indicated by chemical and enzymatic assays, by electron microscopy and by incorporation experiments, the collagen-synthethesizing rough endoplasmic reticulum fraction was isolated free from the secretory vesicles (smooth endoplasmic membranes and Golgi elements) and fibrous extracellular matrix. Collagen differed from other proteins in the distribution among the subcellular fractions. In pulse-chase experiment the translocation of 14C-labelled collagen was demonstrated from the rough endoplasmic reticulum through the secretory vesicles to extracellular fibrillar collagen. This fractionation method will be used to study the modulation of collagen synthesis and secretion in the reparative tissue.</p>","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"B33 5","pages":"327-36"},"PeriodicalIF":0.0,"publicationDate":"1979-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"11710840","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}
Pub Date : 1977-01-01DOI: 10.3891/acta.chem.scand.31a-0364
K Kaas, H Sorensen
The relative configuration of 3-hydroxy-3-isobutyl-2-pyrrolidone-5-carboxylic acid has been determined by an X-ray crystal structure analysis. The compound crystallized in space group P212121 with two molecules in the asymmetric unit. a=16.023(3) A, b=19.349(7) A, c=6.9053(16) A. The structure was solved by direct methods using MULTAN and refined by full-matrix least-squares technique to an R of 0.137 for 645 diffractometer-collected intensities. The absolute configurations of the title compounds were deduced; the configuration of the amino acid and the lactam are 2(S), 4(S) and 3(S), 5(S), respectively.
用x射线晶体结构分析确定了3-羟基-3-异丁基-2-吡咯烷酮-5-羧酸的相对构型。该化合物在P212121空间群中结晶，两个分子在不对称单元中。a=16.023(3) a, b=19.349(7) a, c=6.9053(16) a。利用MULTAN直接求解，利用全矩阵最小二乘技术对645个衍射仪采集的光强进行细化，R值为0.137。推导了标题化合物的绝对构型;氨基酸和内酰胺的构型分别为2(S)、4(S)和3(S)、5(S)。
{"title":"The crystal structure of 3-hydroxy-3-isobutyl-2-pyrrolidone-5-carboxylic acid, lactam of 4-hydroxy-4-isobutylglutamic acid from Reseda odorata L.","authors":"K Kaas, H Sorensen","doi":"10.3891/acta.chem.scand.31a-0364","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.31a-0364","url":null,"abstract":"<p><p>The relative configuration of 3-hydroxy-3-isobutyl-2-pyrrolidone-5-carboxylic acid has been determined by an X-ray crystal structure analysis. The compound crystallized in space group P212121 with two molecules in the asymmetric unit. a=16.023(3) A, b=19.349(7) A, c=6.9053(16) A. The structure was solved by direct methods using MULTAN and refined by full-matrix least-squares technique to an R of 0.137 for 645 diffractometer-collected intensities. The absolute configurations of the title compounds were deduced; the configuration of the amino acid and the lactam are 2(S), 4(S) and 3(S), 5(S), respectively.</p>","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"31 5","pages":"364-8"},"PeriodicalIF":0.0,"publicationDate":"1977-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12068716","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}
Pub Date : 1975-01-01DOI: 10.3891/acta.chem.scand.29a-0045
T Ottersen, C Christophersen, S Treppendahl
The crystal and molecular structure of the meso-ionic title compound, C13H10N4O, have been determined by X-ray methods using 2667 reflections above background level collected by counter methods at 105 K. The crystals are monoclinic, space group P2a/c, with cell dimensions: a=5.233(2) A; b=18.846(6) A; c=11.643(2) A, beta=105.71 degrees(2), with 4 molecules per unit cell. The structure model was refined to an R-factor of 0.047. In order to reduce the influence of the valence electrons all reflections with sin theta/lambda smaller than 0.5 A- minus 1 were excluded in the last stages of the refinement procedure (leaving 1658 Fo'S, R=0.058). The central five-membered ring is found to be planar and the bond lengths within this ring indicate a resonance stabilized system, as has been found for sydnones. The planes of the two benzene rings are tilted 11.7 and 8.0 degrees, respectively, with respect to the plane of the central oxatriazolio-ring.?
{"title":"The structure of N-[3-phenyl-5-(1,2,3,4-oxatriazolio)]-phenylamide at 105 K.","authors":"T Ottersen, C Christophersen, S Treppendahl","doi":"10.3891/acta.chem.scand.29a-0045","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.29a-0045","url":null,"abstract":"<p><p>The crystal and molecular structure of the meso-ionic title compound, C13H10N4O, have been determined by X-ray methods using 2667 reflections above background level collected by counter methods at 105 K. The crystals are monoclinic, space group P2a/c, with cell dimensions: a=5.233(2) A; b=18.846(6) A; c=11.643(2) A, beta=105.71 degrees(2), with 4 molecules per unit cell. The structure model was refined to an R-factor of 0.047. In order to reduce the influence of the valence electrons all reflections with sin theta/lambda smaller than 0.5 A- minus 1 were excluded in the last stages of the refinement procedure (leaving 1658 Fo'S, R=0.058). The central five-membered ring is found to be planar and the bond lengths within this ring indicate a resonance stabilized system, as has been found for sydnones. The planes of the two benzene rings are tilted 11.7 and 8.0 degrees, respectively, with respect to the plane of the central oxatriazolio-ring.?</p>","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"29 1","pages":"45-50"},"PeriodicalIF":0.0,"publicationDate":"1975-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"12316979","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}
Pub Date : 1974-12-31DOI: 10.3891/acta.chem.scand.28a-0675
P. Andersen, E. Astrup, P. Frederichsen, K. Nakken
{"title":"The molecular structure of 2,2,6,6-tetramethyl-4-piperidone-1-oxyl free radical determined by electron diffraction in the gas phase.","authors":"P. Andersen, E. Astrup, P. Frederichsen, K. Nakken","doi":"10.3891/acta.chem.scand.28a-0675","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.28a-0675","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"28 6 1","pages":"675-9"},"PeriodicalIF":0.0,"publicationDate":"1974-12-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69976679","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}
Pub Date : 1974-01-01DOI: 10.3891/acta.chem.scand.28a-0477
P Jervøe, H E Madsen
{"title":"Calcium phosphates with apatite structure 1. Precipitation at different temperatures.","authors":"P Jervøe, H E Madsen","doi":"10.3891/acta.chem.scand.28a-0477","DOIUrl":"https://doi.org/10.3891/acta.chem.scand.28a-0477","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"28 5","pages":"477-81"},"PeriodicalIF":0.0,"publicationDate":"1974-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15563271","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}
{"title":"The crystal structure of (plus or minus)-erythro-20(2,5-dimethoxy-phenyl)-2-hydroxy-1-methylethylammonium chloride.","authors":"M V Gabrielsen, A M Sørensen","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"28 10","pages":"1162-6"},"PeriodicalIF":0.0,"publicationDate":"1974-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15563269","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}
P Andersen, E E Astrup, P S Frederichsen, K F Nakken
{"title":"The molecular structure of 2,2,6,6-tetramethyl-4-piperidone-1-oxyl free radical determined by electron diffraction in the gas phase.","authors":"P Andersen, E E Astrup, P S Frederichsen, K F Nakken","doi":"","DOIUrl":"","url":null,"abstract":"","PeriodicalId":75375,"journal":{"name":"Acta chemica Scandinavica. Series A: Physical and inorganic chemistry","volume":"28 6","pages":"675-9"},"PeriodicalIF":0.0,"publicationDate":"1974-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"15563272","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}
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