NEW YORK (

TheStreet

) -- Several stocks trading near $5 were poised to move on above-average volume during Tuesday's session.

Ballard Power Systems

(BLDP) - Get Report

jumped by 35 cents, or 15.1%, to $2.67 in the premarket session after the company said it has acquired a controlling interest in Denmark-based Dantherm Power, which will result in accelerated development of fuel cell backup power applications across Europe. The 50-day average daily volume for Ballard Power is 470,000, according to the

Nasdaq

.

Helicos BioSciences

(HLCS)

rose by 11 cents, or 9.8%, to $1.23 in the premarket session after the company announced the sale of a Helicos Genetic Analysis System to the Turku Centre for Biotechnology. Terms were not disclosed. Riitta Lahesmaa, Director of the center, said the acquisition of a Helicos system will allow the center to perform novel experiments using single molecule sequencing technology. The 50-day average daily volume for Helicos is 1.27 million.

MDRNA

(MRNA) - Get Report

added 6 cents, or 5.9%, to $1.08 in the premarket session after the company announced the presentation of data highlighting the ability of its UsiRNA construct to significantly minimize off-target effects while maintaining potent RNA Interference (RNAi) activity. The 50-day average daily volume for MDRNA is 1.17 million.

PFSweb

(PSFW)

continued to rally, climbing 12.4% to $4.25 in the premarket session. Last week, PFSweb and

Procter & Gamble

(PG) - Get Report

jointly announced that they will begin piloting the eStore, an online shopping site that will be owned and operated by PFSweb and exclusively feature P&G products to consumers in the U.S The 50-day average daily volume for PFSweb is 19,000.

Enterra Energy Trust

(ENT) - Get Report

jumped by 37 cents, or 17.4%, to $2.48 in the premarket session after the company said its board of directors unanimously approved the conversion of the Trust to a corporation to be named

Equal Energy Ltd

. The three-month average daily volume for Enterra is 361,000, according to Yahoo! Finance.

(

Earlier at 7:34 a.m. EST

.)

Allied Defense Group

( ADG) was set to trade higher after

Chemring Group

agreed to acquire the company for $7.25 a share in an all-cash deal. The three-month average daily volume for Allied Defense is 27,000, according to Yahoo! Finance.

GenVec

(GNVC)

rallied by 26 cents, or 15%, to $2 in the premarket session after the company said it has entered into a research collaboration and license agreement with

Novartis

(NVS) - Get Report

to develop treatments for hearing loss and balance disorders. If certain clinical, regulatory and sales milestones are met, GenVec is eligible to receive up to $213.6 mln, including upfront and milestone payments, in addition to royalties on future sales. The 50-day average daily volume for GenVec is 2 million, according to the

Nasdaq

.

Chelsea Therapeutics

(CHTP)

should open higher Tuesday after Roth Capital Partners raised its stock price target to $6 from $5 following a meeting with Chelsea's management, with the firm saying it feels more sanguine about prospects for lead drug Droxidopa to treat neurogenic orthostatic hypotension. The 50-day average daily volume for Chelsea Therapeutics is 462,000.

Hersha Hospitality Group

(HT) - Get Report

may trade higher after R.W. Baird analysts upgraded the stock to outperform from neutral and raised their stock price target to $4 from $3. The firm cited the recent share offering, which helps reduce leverage and increase liquidity. The three-month average daily volume for Hersha Hospitality is 697,000.

-- Written by Robert Holmes in Boston

.

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