Experimental evolution of reduced sex ratio adjustment under local mate competition     

Macke E  Magalhães S  Bach F  Olivieri I 《Science (New York, N.Y.)》2011,334(6059):1127-1129

Theory predicts that local mate competition (LMC) favors the evolution of female-biased sex ratios. Empirical support of this prediction is indirect and comes from comparative studies or from studies showing that individuals can adjust their offspring sex ratio in response to varying LMC intensities. Replicate lines from a population of the spider mite Tetranychus urticae were selected under three LMC intensities for up to 54 generations. Within each selection regime, the final sex ratio matched theoretical predictions. Furthermore, the ability of individuals to adjust their offspring sex ratio diminished in females evolving under strict LMC, but not in females evolving under relaxed LMC levels. These results provide direct experimental evidence for the evolutionary process by which LMC modifies sex-allocation strategies and suggest that evolution under strict and constant LMC may lead to a loss of phenotypic plasticity.  相似文献   

Chloral hydrate: a solvent for biological membranes   总被引：1，自引：0，他引：1  

B Ballou  G Sundharadas  M L Bach 《Science (New York, N.Y.)》1974,185(150):531-533

A buffer system conitainin chloral hydrate, taurine, and bromopyridinium lactate was used to dissolve several biological membranes and separate their protein components by polyacrylamide gel electrophoresis. This solvent system was capable of separating molecules of similar size on the hasis of their charge and allows easy recovery of the proteins Thus. aqueous chloral hydrate is an effective solvent for biological membranes.  相似文献   

Specificity of allogeneic cell recognition by human lymphocytes in vitro   总被引：14，自引：0，他引：14  

D C Zoschke  F H Bach 《Science (New York, N.Y.)》1971,172(990):1350-1352

Human lymphocytes proliferate in vitro in response to foreign histocompatibility antigens that are present on allogeneic lymphocytes. Within a population of immunocompetent lymphocytes there are specific subpopulations that respond to allogeneic cells from different individuals. A means of selectively eliminating such subpopulations is suggested.  相似文献   

Zum Einfluß organischer Bodenbedeckung auf den lateralen Transport von Isoproturon auf der Bodenoberfläche     

Audun Korsaeth  Philip Müller-Berghfer  Konrad Mollenhauer  Peter Fischer  Martin Bach  Hans-Georg Frede 《植物养料与土壤学杂志》1997,160(4):519-523

On the Effect of Organic Surface Cover on Lateral Transport of Isoproturon on Soil Surface The losses of the herbicide isoproturon with the surface runoff and the sediment loss have been measured by means of rainfall simulations on microplots (0.5 × 1 m²) with different mulch materials and increasing soil cover percentages (wheat straw vs. rape leafs). Soil cover by straw showed no significant effect on the runoff discharge, but the total loss of isoproturon increased between 22 and 37%. Soil cover by rape leafs diminished the runoff by between 13 and 61%, the reduction of isoproturon loss was in the same range. It was shown, that the different influences of different mulch materials on runoff and soil loss can lead to different pesticide losses. Therefore, the only giving of “mulch” without specification does not describe such experiments sufficiently.  相似文献   

Submikroskopischer Bau eines Hanggleys aus Gurnigelflysch     

H. R. Gerber  M. Müller-Vonmoos  R. Bach 《植物养料与土壤学杂志》1969,124(3):225-237

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Morphologische und agronomische Merkmale autochthoner annueller Medicago-Arten in Marokko     

M. Cremer-Bach  M. Bach 《Journal of Agronomy and Crop Science》1994,172(2):81-89

Morphological and agronomic characteristics of autochthonous annual Medkago species in Morocco
Autochthonous annual Medicago species were collected on non-alkaline soils and evaluated as to their potential agricultural use. 411 Medicago ecotypes were found at 108 sites. With increasing rainfall and altitude of collecting sites, a decrease was recorded in the length of sprouts, in sward height, in leaf size, and in dry matter yield. High rainfall regions were found to select late flowering ecotypes. All Medicago ecotypes tested showed broad intraspecific variation in seed yield, leaf size and seed weight. Coumestrol content of leaves at flowering was generally low; on average 115 ppm of dry matter. No relationship was found between collection sites and coumestrol content. In a field trial comparing 112 ecotypes with nine introduced cultivars at two contrasting sites, thirty ecotypes proved to be better adapted to local conditions than the cultivars.  相似文献   

Early ultrasonic diagnosis of twins after insemination and contralateral embryo transfer in cattle and the results of calving     

S Bach  W K?hn  F Müller  J Schulz  S Geigenmüller 《Tier?rztliche Praxis》1991,19(4):365-368

In order to test the efficacy of ultrasonic diagnosis of early twin pregnancy, 20 dairy cows were inseminated, and 4-8 days later a seven-day old embryo was additionally transferred into the uterine horn contralateral to the site of ovulation. Sixteen of 20 cows became pregnant (80%). In 7 of 16 animals a twin pregnancy resulted (44%). Out of eight single pregnancies five (62.5%) followed insemination, and three (37.5%) followed egg transfer. Sixteen pregnant animals were examined ultrasonically. In 7 cases it was possible to estimate a twin pregnancy on the 41st day. This diagnosis was verified on parturition. The ultrasonically diagnosed side of pregnant horn in the singles was correct in 7 of 8 cases, identified by the genetical different origin of the offspring from artificial insemination or egg transfer.  相似文献   

Experimental xenografting of kidneys. Operative procedure and technique of preservation (author's transl)]     

C H Prange  D Bach  K Schulze-Hagen 《DTW. Deutsche tier?rztliche Wochenschrift》1979,86(1):23-28

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A case of necrolytic migratory erythema managed for 24 months with intravenous amino acid and lipid infusions     

Jonathan F. Bach  Seth A. Glasser 《The Canadian veterinary journal. La revue veterinaire canadienne》2013,54(9):873-875

A 9-year-old castrated male Shetland sheepdog was diagnosed with necrolytic migratory erythema and hepatocutaneous syndrome. Necrolytic migratory erythema was treated with intermittent intravenous amino acids as needed to control cutaneous lesions. The addition of lipid infusions extended the treatment interval. The patient had a favorable response for 24 months.  相似文献   

Role of sterol 3‐ketoreductase sensitivity in susceptibility to the fungicide fenhexamid in Botrytis cinerea and other phytopathogenic fungi     

Danièle Debieu  Jocelyne Bach  Emeline Montesinos  Sabine Fillinger  Pierre Leroux 《Pest management science》2013,69(5):642-651

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