6.7 GHz methanol masers are the brightest of class II that regarded as excellent signposts in formation young massive stars. We present here a molecular line study 68 maser hosts chosen from MMB catalogue, have MALT90 data available. performed (1) pixel-by-pixel 9 sources high signal-to-noise ratio and (2) statistical taking into account entire sources. estimated column densities abundances N$_...

Spectroscopy of the ν1 band of the astrophysically relevant ion HCO(+) is performed with an optical parametric oscillator calibrated with an optical frequency comb. The sub-MHz accuracy of this technique was confirmed by performing a combination differences analysis with the acquired rovibrational data and comparing the results to known ground-state rotational transitions. A similar combination...

The envelopes and disks around embedded low-mass young stellar objects (YSOs) are investigated through millimeter continuum and HCO+ line emission. Nine sources, selected on the basis of their HCO+ 3–2 emission from an IRAS fluxand color-limited sample of 24 objects, are observed in λ = 3.4 and 2.7 mm continuum emission with the Owens Valley Millimeter Array, and in the HCO+ and H13CO+ 4–3, 3–2...

The Na(+) requirement for photosynthesis and its relationship to dissolved inorganic carbon (DIC) concentration and Li(+) concentration was examined in air-grown cells of the cyanobacterium Synechococcus leopoliensis UTEX 625 at pH 8. Analysis of the rate of photosynthesis (O(2) evolution) as a function of Na(+) concentration, at fixed DIC concentration, revealed two distinct regions to the res...

Patterns of salivary HCO secretion vary widely among species and among individual glands. In particular, virtually nothing is known about the molecular identity of the HCO transporters involved in human salivary secretion. We have therefore examined the distribution of several known members of the Na(+)-HCO cotransporter (NBC) family in the parotid and submandibular glands. By use of a combinat...

Methenyltetrahydrofolate synthetase (EC 6.3.3.2) catalyzes the irreversible ATP and Mg2+-dependent transformation of 5-formyltetrahydrofolate (N5-HCO-H4-pteroylglutamic acid (PteGlu] to 5,10-methenyltetrahydrofolate. The physiological function of this reaction remains unknown even though it is potentially involved in the intracellular metabolism of the large doses of N5-HCO-H4-PteGlu (leucovori...

We describe the results of 50 operations carried out on 46 patients with medial osteoarthritis of the knee of Ahlbäck grade 1 to 3. Patients were randomised either to a closed-wedge high tibial osteotomy (HTO) or an open-wedge procedure based on the hemicallotasis technique (HCO). Their median age was 55 years (38 to 68). The preoperative median hip-knee-ankle (HKA) angle was 171 degrees (164 t...

Pyloric caeca and anterior intestine epithelia from seawater-acclimated rainbow trout exhibit different electrophysiological parameters with lower transepithelial potential and higher epithelial conductance in the pyloric caeca than the anterior intestine. Both pyloric caeca and the anterior intestine secrete HCO(3)(-) at high rates in the absence of serosal HCO(3)(-)/CO(2), demonstrating that ...

In a previous paper we computed the phase response curve (PRC) of a half-center oscillator (HCO), a pair of reciprocally inhibitory model neurons that exhibit alternating rhythms, based on the minimal ionic model. It was showed that the two intrinsic mechanisms of the local HCO, “release” and “escape”, gave rise to two different shapes of PRCs. In this paper we use the theory of weakly coupled ...

The renal proximal tubule (PT) plays a major role in whole-body pH homeostasis by secreting H into the tubule lumen. Previous work demonstrated that PTs respond to basolateral changes in [CO2] and [HCO 3 ] by appropriately altering H secretion—responses blocked by the ErbB inhibitor PD168393, or by eliminating signaling through AT1 angiotensin receptors. In the present study, we analyze phospho...