Health care-related exchange-traded funds were among the top performers of Tuesday's session, thanks to an upswing in several biotech and medical device manufacturer stocks. The Biotech HOLDRs ( BBH) was higher by 1.1%. Among its holdings, Genentech ( DNA) was rising 2.3%, Amgen ( AMGN) gained 1.4%, and Gilead Sciences ( GILD) tacked on 1%. Recently, the Biotech HOLDRs was higher by $2.12 to $189.27. The iShares Dow Jones U.S. Medical Devices ( IHI) was also higher, thanks to gains of 2% or more in holdings St. Jude Medical ( STJ), Boston Scientific ( BSX) and Medtronic ( MDT). The ETF was gaining 41 cents, or 0.8%, to $54.87. On the losing side, the Internet Infrastructure HOLDRs ( IIH) slid more than 2%. Among its holdings, BEA Systems ( BEAS) was slumping 3.8%, Akamai Technologies ( AKAM) was losing 2.6%, and VeriSign ( VRSN) was down 1.9%. The Internet Infrastructure HOLDRs ETF was recently falling 11 cents, or 2.2%, to $4.97. Other Internet names were suffering. Ariba ( ARBA) fell 2.3%, and Checkfree ( CKFR) was shedding 0.5%. Both holdings combined to sink the B2B Internet HOLDRs ( BHH), which was recently down 3 cents, or 1.5%, to $2. ETFs tracking silver and gold were also lower. Silver futures dropped 20 cents to $13.37 an ounce. Gold futures lost $6.20 to close at $677.30 an ounce The iShares Silver Trust ( SLV) was shedding 1.4% to $131.45. The Market Vectors Gold Miners ( GDX) eased 1.2% to $39.09. The PowerShares DB Silver ( DBS) ETF was recently down 1.2% to $26.09. The streetTRACKS Gold Shares ( GLD) ETF was off 0.6% to $66.71.