Studies on Lake Erie's littoral algae; Host specificity and temporal periodicity of epiphytic diatoms

Substratum specificity and temporal periodicity of the attached diatom flora upon three aquatic vascular plants and an artificial substratum were examined in three Lake Erie marshes. No qualitative or quantitative specificity for substrata was observed. Variability of diatom assemblage structure within replicate samples of a particular substratum type was as great as, or greater than, variability between substrata. Diatom assemblages upon dowel rod displayed a mid to late summer density maximum. Variability of density maxima upon natural substrata was attributed to different growth rates of the host macrophytes. Diatom assemblages within each sampling site possessed a distinct temporal periodicity indicating that factors affecting diatom growth are heterogeneous in distribution throughout Lake Erie's littoral zone.Peer Reviewedhttp://deepblue.lib.umich.edu/bitstream/2027.42/42923/1/10750_2004_Article_BF00013712.pd

A measurement of the lifetime of the Λ5He hypernucleus

The mean lifetime of the Λ5He hypernucleus has been estimated in nuclear emulsion using the π- + p + 4He decays both at rest and in flight. The result obtained is τ(Λ5He) = (2.74-0.50+0.60)·10-10 sec. This result together with the experimental value of Q-, the ratio of the non-mesonic to π- mesonic decay rates for Λ5He, has been used to determine the ratio R = Γ(Λ5He → π- + p + 4He)/Γ(Λ0 → π- + p). © 1970.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Isslyedovaniye sootnoshyeniya myezhdu probyegom i enyergiyei{cyrillic, short} v emul{cyrillic small soft sign}sii

An apparent variation of the mass of the Λ-hyperon with the energy of the decay π--meson has been observed in emulsion. This anomaly has been attributed to a systematic error in the range-energy relation for emulsion for particle velocities greater than 0.6 c. © 1970 Società Italiana di Fisica.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

Evidence for the existence of particle-unstable states of the Λ12C and Λ14N hypernuclei

Evidence is presented for the existence of particle-unstable states of the Λ12C and Λ14N hypernuclei produced by the absorption at rest of K- mesons in light emulsion nuclei. © 1970.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

On the lifetime of the 3ΛH ypernucleus

The mean lifetime of the 3ΛH hypernucleus has been estimated in nuclear emulsion using the (π-+1H+2H) decays both at rest and in flight. The result, τ(3ΛH) = (1.28-0.26+0.35) · 10-10 sec, is significantly lower than another recent experimental value [5] and the theoretical predictions. A possible explanation of the discrepancy with the theoretical predictions is briefly discussed. © 1970.SCOPUS: ar.jinfo:eu-repo/semantics/publishe

A determination of the masses of the charged Σ hyperons

The masses of the charged Σ hyperons have been determined from the mean ranges of particles from the interactions of K- mesons at rest on hydrogen in emulsion, K- + p → Σ± + π∓, and also the mean rannge of the protons from Σ+ hyperons at rest, Σ+ → p + π0. The results are mΣ+ = 1189.39 ± 0.06 MeV/c2, mΣ- - mΣ+ = 7.91 ± 0.23 MeV/c2, which give mΣ-=1197.30±0.24 MeV/c2. The finding that the energy loss rate of low velocity negative particles is less than that of positive particles has been confirmed, but in contradiction with an earlier result, the range straggling for negative particles was not found to be anomalously high. © 1972.SCOPUS: ar.jinfo:eu-repo/semantics/publishe