Multicellular organisms and steady-state microbial populations consist of cells in all possible developmental stages. In such populations some cells are vigorously growing, others are preparing to divide, and stll others are actually in the process of cell division. Environmental conditions necessary for the optimum development of one stage in the life history of the cell may be totally inadequ...

Exposure to UVB radiation caused shifts in the species composition of diatom assemblages developing on ceramic tiles in a natural marine habitat near Korinthos, Greece. These differences in community structure were more pronounced during the first month of community development. The diatom species Mastogloia crucicula and Nitzschia constricta were sensitive to both UVA and UVB radiation, while ...

The classical monoamine theory of depression states that depression may be caused by a central deficiency of biogenic amines, particularly norepinephrine and serotonin. It has been proposed that effective antidepressant therapies work by correcting the central deficiency in biogenic amines and reequilibrate monoaminergic systems in the direction of greater efficiency. The transplantation of pha...

We present fluid dynamics videos of the motion of a boat on a twolayer or three-layer fluid. Under certain specific conditions, this setup generates large amplitude interfacial waves, while no surface waves are visible. The boat is slowed down leading to a peristaltic effect and sometimes even stopped: this is the so-called dead water phenomenon. The phenomenon of dead water was first encounter...

A new genus and species of stygobiontic bidessine dytiscid beetle, Comaldessus stygius, from Comal Springs, Texas, is described and compared with the proposed sister epigean genus Uuarus and the only other known stygobiontic bidessine water beetles, Trogloguignotus concii Sanfilippo from Venezuela and Uvarus chappuisi (Peschet) from Africa. Distinctive characters of the adult are illustrated wi...

Depression is a common mental disorder with relatively high lifetime prevalence and substantial disability, especially in women [1–3]. Clinical manifestations of depression include loss of interest or pleasure, disturbed sleep or appetite, poor concentration, etc., worst of which is suicide. To solve such an important global public health issue, it is essential to establish ideal animal models ...

A new design of interception trap is presented based on a combination of features ofwindow and Malaise traps. The trap has been developed for study of the canopy faunas of rainforest trees, specifically Argyrodendron actinophyllum. Five such traps have been operated in SE Queensland for a year with catches being removed weekly. Coleoptera, Nematocera, Homoptera and Hymenoptera were the most abu...

The rate of photorespiration of Douglas-fir seedlings was measured under different light intensities by: (1) extrapolating the curve for CO., uptake in reilation to atmospheric CO, content to zero CO2, content, and (2) measuring CO, evolution of the plants into a CO2-free airstream. Different results, obtained from these techniques, were lelieved to be caused by 'a severe restriction of the pho...

The orbit is the one anatomical region where the domain of the plastic surgeon overlaps those of the otorhinolaryngologist, the neurosurgeon and the ophthalmologist. The subject is therefore of fairly wide interest to specialists and general practitioners. The emphasis will be placed more on principles than on details. The anatomical orbit' is the area enclosed by the bony walls of the orbit, b...

introduction population growth and development of various industries have turned water pollution into one of the most fundamental problems in the world. researches indicate that, today, underground aquifers, especially in the large and populous cities of the world, are faced with many problems caused by infiltration of industrial wastewater, presence of absorption wells for disposal of human se...