Nature and frequency of chromosomal abnormalities in pregnancies with abnormal ultrasound findings: An analysis of 117 cases with review of the literature

During a 7-year period, 117 fetal karyotypes were available from 131 genetic amniocenteses. These procedures were performed between 14 and 37 weeks' gestation for the following abnormal ultrasound findings: (1) intrauterine growth retardation (IUGR)—61 cases; (2) fetal malformation—71 cases; and (3) amniotic fluid volume (AFV) abnormality—60 cases. Chromosomal abnormalities were identified in 19 cases (16.2 per cent). Aneuploidy was 2.5 times as frequent in the presence of malformations than in their absence. No correlation was demonstrated between specific fetal malformations and specific chromosomal abnormalities. Aneuploidy was also twice as frequent in the presence of symmetrical IUGR than in its absence. No chromosomal abnormalities were found among eight cases of asymmetrical IUGR. Four cases of aneuploidy presented with isolated IUGR, three of these involving the X chromosome. The frequency of aneuploidy was the same with or without abnormalities of AFV (14.3 versus 16.4 per cent). No chromosomal abnormality was found associated with isolated AFV abnormalities.     

Online-Patentrecherchen — schnelle Antworten auf kritische Fragen

Online searching in publically available patent files opens up interesting possibilities to provide a rapid response to critical questions. A computerized analysis of all patents of leading German pharmaceutical companies over the last decade in important indication areas is described. Supported by subsequent manual processing of individual patents it is shown that duplicate experiments on animals practically never occur.     

Konzept für konzentrierte Meeresforschung an fünf Orten

Naturwissenschaften Aktuell

Konzept für konzentrierte Meeresforschung an fünf Orten     

Gold mining in Siberia and the Far East as a source of mercury contamination of the environment

ＩｎｔｒｏｄｕｃｔｉｏｎＳｉｂｅｒｉａａｎｄｔｈｅＦａｒＥａｓｔａｒｅｔｈｅｏｌｄｅｓｔａｎｄｔｈｅｒｉｃｈｅｓｔｇｏｌｄ ｍｉｎｉｎｇａｒｅａｓｏｆＲｕｓｓｉａ .Ｉｎｔｅｎｓｉｖｅｇｏｌｄ ｍｉｎｉｎｇｈｅｒｅｓｔａｒｔｅｄｉｎｔｈｅｂｅｇｉｎｎｉｎｇｏｆｔｈｅ 19ｔｈｃｅｎｔｕｒｙ(Ｖｙａｚｅｌｓｈｃｈｉｋｏｖ ,1963) .Ｆｏｒｔｈｅｍｏｓｔｐａｒｔｇｏｌｄ ｂｅａｒｉｎｇｏｒｅｓａｎｄｓａｎｄｓｗｅｒｅｐｒｏｃｅｓｓｅｄｗｉｔｈｔｈｅｕｓｅｏｆａｍａｌｇａｍａｔｉｏｎｍｅｔｈｏｄｆｏｒｇｏｌｄｅ…     

Stadtökologie

Within the cities, natural environmental conditions become manifold modified. Thereby, together with the high density of population, enduring effects upon human feeling results. In order to ensure reasonable conditions of life, in spite of the many effective factors in the cities, enforced interdisciplinary research and teaching will be necessary.