Diffusion Filter
Friday, August 26th, 2011
How does the blood reabsorb sugar and dissolved mineral ions back into the blood after kidney filters?
I know that your kidney filters your blood and then reabsorbs everything your body needs but my textbook says that both sugar and mineral ions move back into the blood by diffusion along a concentration gradient AND active transport against a concentration gradient but why does it have to work AGAINST the concentration gradient as well?
Glucose does have to be moved against its concentration gradient because the glucose concentration in urine is lower than that in the plasma. So, while it is initially at the same concentration as in the plasma (at the start of the proximal convoluted tubule), its concentration soon drops as the active transport mechanism (a Na+/glucose co-transporter) drops the glucose concentration in the filtrate.
Regarding mineral ions, these are actively pumped out of the filtrate so that there is a high concentration (particularly of Na+) in the interstitial space in the kidney. This high concentration in the interstitial space is required to draw the water out of the filtrate (by osmosis). So, in this sense it needs to pump ions up a net transepithelial gradient because such a gradient is necessary to remove water from the filtrate. Na+ movement is active (against its gradient) so that the water movement can be passive (by osmosis).
Light Bloom & Diffusion Filter
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 BK 6Filter 67mm ND PL UV Star MACRO Diffusion For Nikon D7000 D90 18 105mm  US $28.97
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 BK UVPLDIFFUSION Filter For 72mm Canon EOS 7D Camera 15 85mm Lens US $17.69
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 Rocketfish 77mm Multicoated Diffusion Filter RF DF77S US $.99
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 Soft Focus Diffusion Filter for Sony Alpha A700 A850 A900 A33 A35 A55 A57 A65 US $12.12
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 Rocketfish Multicoated Diffusion Filter RF DF77S H23 US $.99
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 BK 4Filter 37mm NDPLDiffusionUV Lens für Sony HDR CX130E CX160E PJ10E XR160E US $15.00
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 SL UVPLDIFFUSION Filter für 49mm Sony NEX 3 NEX 5 Kamera US $12.80
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 46mm Very Strong Soft Effect Focus Filter Diffusion Diffuser 3 for DSLR SLR 46 US $7.83
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 BK UVPLDIFFUSION Filter für 55mm SONY DSLR Alpha A390 A290 Kamera US $13.36
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 77mm Very Strong Soft Effect Focus Filter Diffusion Diffuser 3 for DSLR SLR 77 US $10.26
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 Rocketfish 58mm Diffusion Filter with 55mm 52mm step down rings RF DF58 US $4.98
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 46mm Soft Effect Focus Filter Diffusion Diffuser 1 for all DSLR SLR 46 US $7.83
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 46mm Strong Soft Effect Focus Filter Diffusion Diffuser 2 for all DSLR SLR 46 US $7.83
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 77mm Soft Effect Focus Filter Diffusion Diffuser 1 for all DSLR SLR 77 US $10.26
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 ELECTRONICS ROCKET FISH 58MM 55MM 52MM CAMERA CAMCORDER DIFFUSION FILTER BLACK US $2.99
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 Rocketfish 58mm Diffusion Filter with 55mm 52mm step down rings RF DF58 MORE US $14.95
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 TIFFEN Special Effects Lens FILTER Set 49mm Star Diffusion Center Spot Case Box US $17.50
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 BK UVPLDIFFUSION Filter For 67mm Canon EOS 7D 18 135mm Lens US $16.18
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 BK 4Filter 52mm ND PL UV Diffusion For Panasonic DMC FZ47 FZ48 FZ150 US $16.74
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 Sunpak Platinum Plus 52mm 55mm 58mm Diffusion Camera Filter US $6.50
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 Canon Unusual Filter could be a Diffusion Filter US $12.99
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 Quantaray Diffusion 241667690 67 mm Filter US $9.99
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 EASTMAN KODAK DIFFUSION DISK 5A PATENTED MARCH 8 1921 SPECIAL FILTER US $9.50
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 BK 4Filter 37mm NDPLDiffusionUV Lens For Sony HDR CX130 CX160 PJ10 XR160 US $11.00
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 BK UVPLDIFFUSION Filter Lens For 46mm Panasonic DMC FZ38 FZ35 FZ28 FZ18 Camera US $9.99
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 RocketFish 52mm 55mm 58mm SOFT Diffusion Diffuser Digital SLR Camera Lens Filter US $4.99
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 TIFFEN FILTER 4X4 BLACK DIFFUSION FX 1 2 USA item 007 US $150.00
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 Quantaray Soft Diffusion FilterCase 58mm PORTRAIT Softening Canon Nikon All 58 US $10.95
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 COZO DIFFUSION FILTER 49mm US $5.00
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 BK 4Filter 49mm UV PL DIFFUSION ND Lens For Sony NEX 5 NEX 3 NEX C3 Camera US $15.43
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 BK 4Filter 37mm NDPLDiffusionUV Lens For Sony HDR CX130E CX160E PJ10E XR160E US $15.39
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 BK UVPLDIFFUSION Filter Lens For 58mm Fujifilm Fuji HS20 HS20EXR Camera US $13.73
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 BK UVPLDIFFUSION Filter For 58mm Canon EOS 600D 1100D Camera 18 55mm Lens US $13.73
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 82mm Soft Effect Focus Filter Diffusion Diffuser 1 for all DSLR SLR 82 US $10.99
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 BK UVPLDIFFUSION Filter für 67mm Nikon D7000 18 105mm US $15.73
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 55mm Soft Focus Diffusion Wedding Filter US $12.12
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 BK UVPLDIFFUSION Filter For 58mm Olympus MZUIKO 14 150mm Lens US $13.69
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 67mm Soft Focus Diffusion Wedding Filter US $18.18
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 BK 4Filter 34mm NDPLDiffusionUV Lens For Samsung HMX H200 H204 H205 US $15.39
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 Quantaray 72mm Diffusion Filter Qty of 10 US $14.99
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 Vintage Spiratone Spiralite Series VII 7 Diffuser Diffusion Filter 2 Diameter US $24.95
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 Vintage Underground Camera 55mm Diffusion Filter for SLR Cameras Old Store Stock US $4.99
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 305mm Soft Effect Focus Filter Diffusion Diffuser 1 305 for all DSLR SLR US $7.83
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 30mm Soft Effect Focus Filter Diffusion Diffuser 1 2 30 for all DSLR SLR US $7.83
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 34mm Soft Effect Focus Filter Diffusion Diffuser 1 34 for all DSLR SLR US $7.83
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 Quantaray 49mm Diffusion Filter 24 166 1438 NEW US $5.97
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 49mm FLUORESCENT SKYLIGHT AND DIFFUSION FILTERS US $14.91
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 55MM STAR DIFFUSION AND UV FILTERS US $9.91
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 TIFFEN 67MM SOFTNET DIFFUSION 1W WHITE FILTER NEW US $25.00
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 55mm Strong Soft Effect Focus Filter Diffusion Diffuser For All DSLR SLR 55 mm US $6.59
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 Tiffen 77mm SOFNET DIFFUSION 2 B FILTER BLACK 2B MINT US $49.95
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 Tiffen 55 mm Diffusion 2 Filter Made in Japan with Box US $10.00
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 Rocketfish RF DF58 Diffusion Camera Lens Filter 58mm US $4.99
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 BK UVPLDIFFUSION Filter für 52mm Panasonic Lumix DMC G1 G2 G10 Kamera US $13.36
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 Tiffen 52mm Glimmerglass Diffusion Filter 1 52GG1 US $47.49
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 2 QUANTARAY 55MM CAMERA LENS FILTER DIFFUSION DIFFUSER UV HAZE FAST SHIPPING US $11.99
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 SUNPAK 55mm DIFFUSION FILTER MADE IN JAPAN BRAND NEW US $18.38
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 BK UVPLDIFFUSION Filter für 49mm Sony NEX 3 NEX 5 NEX5 NEX3 Kamera US $12.80
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 BK UVPLDIFFUSION Filter für 46mm Panasonic HDC TM700 HS700 SD600 SD700 US $12.80
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 48mm Quantaray Diffusion Lens Filter US $4.00
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 BK UVPLDIFFUSION Filter For 52mm Pentax K X KX K r KR US $13.69
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 49mm Quantaray Diffusion Lens Filter US $4.00
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 6X CROSS DIFFUSION NEUTRAL DENSITY 8 FILTERS CAMERA US $14.99
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 Tiffen 49 mm Diffusion 3 Screw In Filter with Case Box Made in Japan NEW US $11.00
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 NEW Anton Bauer UL DF Diffusion Filter ULDF Ultralight US $49.00
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 72mm Soft Focus Wedding Diffusion Filter US $23.23
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 Tiffen Warm Black Diffusion FX 1 4 4x4 glass filter w protective case US $49.99
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 HASSELBLAD b50 b57 57 bay 50 b 50 Diffuser 2 DF2 Diffusing Lens Filter Diffusion US $22.00
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 BK UVPLDIFFUSION Filter für 34mm Samsung HMX H205 H200 H204 US $12.80
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 PRO 49mm DIFFUSION FILTER MADE IN JAPAN US $9.77
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 Tiffen Gold Diffusion FX 1 2 4x4 glass filter w protective case US $49.99
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 Promaster Diffusion Filter 55mm US $15.00
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 Promaster Diffusion Filter 72mm US $34.00
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 Promaster Diffusion Filter 77mm US $44.00
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 Promaster Diffusion Filter 67mm US $24.00
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 Lindahl warm touch diffusion 2 filter US $16.50
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 Lee Filters Lighting Gel Sheet 450 3 8 White Diffusion US $6.25
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 Tiffen Black Diffusion FX 1 2 4x4 glass filter w protective case US $49.99
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 Lee Filters Lighting Gel Sheet 216 White Diffusion US $6.25
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 Soft Focus Diffusion Filter for Olympus Evolt E 300 E 330 E 500 US $12.12
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 TOYO 55mm 3 Filter Kit CROSS SCREEN FOG B SPOT DIFFUSION Excellent Conditi US $39.95
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 BK UVPLDIFFUSION Filter For 67mm Sony NEX VG10E 18 200mm Lens US $16.15
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 BK UVPLDIFFUSION Filter For 405mm Samsung NX100 Camera 20 50mm Lens US $13.14
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 BK UVPLDIFFUSION Filter Lens For 62mm Panasonic DMC GH1 Camera US $16.15
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 BK 4Filter 52mm ND DIFFUSION PL UV Lens For Nikon D5100 Camera 18 55mm US $16.70
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 Used Prinz 67mm Diffusion Filter US $49.99
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 Rocketfish RF DF58 58mm Diffusion Filter US $9.95
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 Rokunar Diffusion Filter 55mm US $11.90
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 TIFFEN 49mm BLACK DIFFUSION 3 FILTER BRAND NEW 49 US $34.93
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