geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Structure et composition chimique elementaire de quelques coquilles d'oeufs de dinosaures du Jurassique et du Cretace d'Amerique du Nord


, : Structure et composition chimique elementaire de quelques coquilles d'oeufs de dinosaures du Jurassique et du Cretace d'Amerique du Nord. Annales de Paleontologie 87(4): 249-269

Microstructural analyses of some dinosaur eggshells from Jurassic and Cretaceous sites of North America show a large variability in the state of preservation. Outer and inner surfaces are often hidden by secondary deposits, and the tubercles or ridges and spherolites are not visible. Chemical analyses show that some fragments are strongly enriched in Si. There is a good correlation between the preservation of the structures and the chemical contents. Diagenetic processes are different from those described in the samples from Southern France.

US$29.90


Other references

Gao, H-sheng.; Wang, S-xin.; Chen, L-ming.; Li, Y-ming.; Yuan, S-ling.; Jiao, Z-shan.; Hui, W-li.; Yang, Z.; Zhao, Z-yong., 2004: Analysis of relation between the usage of corticosteroid in treatment and arthralgia as a sequela of SARS patients. To analyze relation between the use of corticosteroids in the treatment for severe acute respiratory syndrome (SARS) patients and arthralgia as a sequela. Clinical date of 30 SARS patients without other diseases in whom corticosteroid was used wer...

Dionello, C.F.; Sá-Caputo, D.; Pereira, H.Vfs.; Sousa-Gonçalves, C.R.; Maiworm, A.I.; Morel, D.S.; Moreira-Marconi, E.; Paineiras-Domingos, L.L.; Bemben, D.; Bernardo-Filho, M., 2016: Effects of whole body vibration exercises on bone mineral density of women with postmenopausal osteoporosis without medications: novel findings and literature review. The aim of this study was to review the literature about the effect of whole body vibration exercise in the BMD in patients with postmenopausal osteoporosis without medications. A systematic review was performed. The frequency of the mechanical vi...

Zhou You, 2006: Evaluation system for priority conservation of wild edible plants in Changbai Mountains. An index system for quantitatively evaluating rare and endangered edible plants was set up in terms of the result of a six-year investigation and some relevant data, which includes seven indexes, such as storage coefficient, urgency degree, and so...

de Heaulme, M.; Anderson, J., 1978: Exploitation of medical records. The difficulties in fully exploiting correct and valid medical data held in a computer system are presented. The requirements for such a system to answer a physician's request are detailed and related to the clinical user, the computer interf...

Guerne, J.M.; Stutinsky, F., 1961: Study in vivo of variations of sensitivity to oxytocin of the uterus of the cyclic rat. Journal de Physiologie 53: 357-358

Zangari, F.; Turci, P., 2013: Cardiomiopatia takotsubo in corso di trattamento odontoiatrico caso clinico e riflessioni medico-legali. Viene proposto un caso clinico di cardiomiopatia takotsubo, manifestatasi a seguito di estrazione dentale eseguita in anestesia locale. <section-title>Materiali e metodi</section-title> Paziente femmina, di anni 7, affetta da ipertensi...

Alves, F.A.; Pires, F.R.; D.A.meida, O.P.; Lopes, M.A.; Kowalski, L.P., 2004: PCNA, Ki-67 and p53 expressions in submandibular salivary gland tumours. Salivary gland tumours are uncommon with a broad heterogeneity. The most common benign tumour is the pleomorphic adenoma, whereas mucoepidermoid carcinoma and adenoid cystic carcinoma predominate among the malignancies. Most salivary gland tumours...

Fox, Jeffrey L., 1988: Biotechnology alfresco. Scientists are cautiously moving toward development of regulations that would govern the environmental release of genetically engineered microorganisms. The government's current case-by-case approach has been criticized as being cumbersome an...

Nowakowska-Zajdel, E.; Mazurek, U.; Stachowicz, M.; Niedworok, E.; Fatyga, E.; Muc-Wierzgoń, Młgorzata., 2012: Cellular signal transduction pathways by leptin in colorectal cancer tissue: preliminary results. The aim of the study was to analyse genes typing with the use of the oligonucleotide microarray technique (HG-U133A, Affymetrix) differentiating colorectal cancer tissues from tissues assessed histopathologically as healthy ones among a panel of 9...

Gollust, S.E.; Thompson, R.E.; Gooding, H.C.; Biesecker, B.B., 2003: Living with achondroplasia: attitudes toward population screening and correlation with quality of life. Since the discovery of the gene that causes achondroplasia, population-wide prenatal screening for this condition has become a possibility. This study sought to assess attitudes toward screening for achondroplasia and correlation with quality of l...