y-ray transitions of energy 2.034 ±0.023 MeV in the hypernucleus \ Li and 3.079 ±0.040 MeV in the hypernucleus ^Be are observed. In both cases, the energy of the y ray in the hypernucleus \z is very close to the energy of the first excited state of the nuclear core. The y rays are interpreted as arising from core transitions in the presence of the A particle. The size of the shift places limits on the strength of the AN spindependent interaction.

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A measurement is reported of the mean lifetime, r, for the weak decay of \ 2 C and j^B hypernuclei. The experiment detected energetic protons from the hypernuclear nonmesonic decay A +/?-•«+/?, in coincidence with hypernuclear production by the strangeness-changing reactions X2 C(K~, 7r~ )i 2 C and n C(K~,ir~)p, l \B.The measured ground-state decay lifetimes T Q 2 C)= (2.11 ± 0.31) xlO" 10 sec and T(VB) = (1.92 ±0.22) x 10" 10 sec are compared with AN weak-interaction calculations.PACS numbers: 21.80. + a, 13.75.Ev, 14.20.Jn, 21.30. + y A lambda hyperon bound to a nucleus will decay with a lifetime typical of weak processes ( -10" 10 sec). This is long compared to the normal strong and electromagnetic (strangeness-conserving) nuclear decay processes so that one generally expects the strangeness-changing decay process to occur for a A in the lowest (IS) nuclear shell-model orbital. This weak interaction is characterized by a total decay rate which equals the sum of four partial rates:

These pilot experiments demonstrated that monitoring of the bacterial stress response is a fast and effective way to detect bacteria in PCs. In addition, special culture conditions are not required for detecting anaerobes and fastidious species.