21. Petrov P, Momekova D, Kostova B, Momekov G, Toncheva- Moncheva N, Tsvetanov CB,
Lambov N (2010) Super-macroporous poly(ethoxytriethyleneglycol acrylate) hydrogels for
sustained delivery of hydrophilic drugs. J Control Release 148:81–82
22. Kostova B, Momekova D, Petrov P, Momekov G, Toncheva-Moncheva N, Tsvetanov CB,
Lambov N (2011) Poly(ethoxytriethylene glycol acrylate) cryogels as novel sustained drug
release systems for oral application. Polymer 52:1217–1222
23. Kahveci MU, Beyazkilic Z, Yagci Y (2010) Polyacrylamide cryogels by photoinitiated free
radical polymerization. J Polym Sci Polym Chem 48:4989–4994
24. Barrow M, Zhang H (2013) Aligned porous stimuli-responsive hydrogels via directional
freezing and frozen UV initiated polymerization. Soft Matter 9:2723–2729
25. Zhang X-Z, Chu C-C (2003) Thermosensitive PNIPAAm cryogel with superfast and stable
oscillatory properties. Chem Commun 2003(12):1446–1447
26. Petrov PD, Georgiev GL (2011) Ice-mediated coating of macroporous cryogels by carbon
nanotubes: a concept towards electrically conducting nanocomposites. Chem Commun
47:5768–5770
27. Petrov PD, Georgiev GL (2012) Fabrication of super-macroporous nanocomposites by deposition of carbon nanotubes onto polymer cryogels. Eur Polym J 48:1366–1373
28. Velickova E, Winkelhausen E, Kuzmanova S, Cvetkovska M, Tsvetanov C (2009)
Hydroxyethylcellulose cryogels used for entrapment of Saccharomyces cerevisiae cells.
React Funct Polym 69:688–693
29. Winkelhausen E, Velickova E, Amartey SA, Kuzmanova S (2010) Ethanol production using
immobilized saccharomyces cerevisiae in lyophilized cellulose gel. Appl Biochem Biotechnol
162:2214–2220
30. Velickova E, Petrov P, Tsvetanov C, Kuzmanova S, Cvetkovska M, Winkelhausen E (2010)
Entrapment of Saccharomyces cerevisiae cells in u.v. crosslinked hydroxyethylcellulose/poly
(ethylene oxide) double-layered gels. React Funct Polym 70:908–915
31. Satchanska G, Topalova Y, Dimkov R, Petrov P, Tsvetanov C, Selenska-Pobell S,
Gorbovskaya A, Bogdanov V, Golovinsky E (2009) Phenol biodegradation by two
xenobiotics-tolerant bacteria immobilized in poly(ethylene oxide) cryogels. Compt Rend
Acad Bulg Sci 62:957–964
32. Topalova Y, Dimkov R, Todorova Y, Daskalova E, Petrov P (2011) Biodegradation of phenol
by immobilized in PEO-cryogel Bacillus laterosporus bt-271 in sequencing bath biofilter.
Biotechnol Biotech Equip 25:2613–2619
33. Christova N, Petrov P, Kabaivanova L (2013) Biosurfactant production by pseudomonas
aeruginosa BN10 cells entrapped in cryogels. Z Naturforsch 68C(1–2):47–52
34. Petrov P, Pavlova S, Tsvetanov CB, Topalova Y, Dimkov R (2011) In situ entrapment of
urease in cryogels of poly(N-isopropylacrylamide): an effective strategy for noncovalent
immobilization of enzymes. J Appl Polym Sci 122:1742–1748
35. Petrov P, Jeleva D, Tsvetanov CB (2012) Encapsulation of urease in double-layered hydrogels
of macroporous poly(2-hydroxyethyl methacrylate) core and poly(ethylene oxide) outer layer:
fabrication and biosensing properties. Polym Int 61:235–239
36. Ravi Kumar MNV, Kumar N, Domb AJ, Arora MA (2002) Pharmaceutical polymeric controlled drug delivery systems. Adv Polym Sci 160:45–117
222
P.D. Petrov and C.B. Tsvetanov
Lambov N (2010) Super-macroporous poly(ethoxytriethyleneglycol acrylate) hydrogels for
sustained delivery of hydrophilic drugs. J Control Release 148:81–82
22. Kostova B, Momekova D, Petrov P, Momekov G, Toncheva-Moncheva N, Tsvetanov CB,
Lambov N (2011) Poly(ethoxytriethylene glycol acrylate) cryogels as novel sustained drug
release systems for oral application. Polymer 52:1217–1222
23. Kahveci MU, Beyazkilic Z, Yagci Y (2010) Polyacrylamide cryogels by photoinitiated free
radical polymerization. J Polym Sci Polym Chem 48:4989–4994
24. Barrow M, Zhang H (2013) Aligned porous stimuli-responsive hydrogels via directional
freezing and frozen UV initiated polymerization. Soft Matter 9:2723–2729
25. Zhang X-Z, Chu C-C (2003) Thermosensitive PNIPAAm cryogel with superfast and stable
oscillatory properties. Chem Commun 2003(12):1446–1447
26. Petrov PD, Georgiev GL (2011) Ice-mediated coating of macroporous cryogels by carbon
nanotubes: a concept towards electrically conducting nanocomposites. Chem Commun
47:5768–5770
27. Petrov PD, Georgiev GL (2012) Fabrication of super-macroporous nanocomposites by deposition of carbon nanotubes onto polymer cryogels. Eur Polym J 48:1366–1373
28. Velickova E, Winkelhausen E, Kuzmanova S, Cvetkovska M, Tsvetanov C (2009)
Hydroxyethylcellulose cryogels used for entrapment of Saccharomyces cerevisiae cells.
React Funct Polym 69:688–693
29. Winkelhausen E, Velickova E, Amartey SA, Kuzmanova S (2010) Ethanol production using
immobilized saccharomyces cerevisiae in lyophilized cellulose gel. Appl Biochem Biotechnol
162:2214–2220
30. Velickova E, Petrov P, Tsvetanov C, Kuzmanova S, Cvetkovska M, Winkelhausen E (2010)
Entrapment of Saccharomyces cerevisiae cells in u.v. crosslinked hydroxyethylcellulose/poly
(ethylene oxide) double-layered gels. React Funct Polym 70:908–915
31. Satchanska G, Topalova Y, Dimkov R, Petrov P, Tsvetanov C, Selenska-Pobell S,
Gorbovskaya A, Bogdanov V, Golovinsky E (2009) Phenol biodegradation by two
xenobiotics-tolerant bacteria immobilized in poly(ethylene oxide) cryogels. Compt Rend
Acad Bulg Sci 62:957–964
32. Topalova Y, Dimkov R, Todorova Y, Daskalova E, Petrov P (2011) Biodegradation of phenol
by immobilized in PEO-cryogel Bacillus laterosporus bt-271 in sequencing bath biofilter.
Biotechnol Biotech Equip 25:2613–2619
33. Christova N, Petrov P, Kabaivanova L (2013) Biosurfactant production by pseudomonas
aeruginosa BN10 cells entrapped in cryogels. Z Naturforsch 68C(1–2):47–52
34. Petrov P, Pavlova S, Tsvetanov CB, Topalova Y, Dimkov R (2011) In situ entrapment of
urease in cryogels of poly(N-isopropylacrylamide): an effective strategy for noncovalent
immobilization of enzymes. J Appl Polym Sci 122:1742–1748
35. Petrov P, Jeleva D, Tsvetanov CB (2012) Encapsulation of urease in double-layered hydrogels
of macroporous poly(2-hydroxyethyl methacrylate) core and poly(ethylene oxide) outer layer:
fabrication and biosensing properties. Polym Int 61:235–239
36. Ravi Kumar MNV, Kumar N, Domb AJ, Arora MA (2002) Pharmaceutical polymeric controlled drug delivery systems. Adv Polym Sci 160:45–117
222
P.D. Petrov and C.B. Tsvetanov